xref: /titanic_51/usr/src/uts/common/os/zone.c (revision 1e194cd1a618eb48f311652742895fc33026c470)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Copyright 2013, Joyent Inc. All rights reserved.
25  */
26 
27 /*
28  * Zones
29  *
30  *   A zone is a named collection of processes, namespace constraints,
31  *   and other system resources which comprise a secure and manageable
32  *   application containment facility.
33  *
34  *   Zones (represented by the reference counted zone_t) are tracked in
35  *   the kernel in the zonehash.  Elsewhere in the kernel, Zone IDs
36  *   (zoneid_t) are used to track zone association.  Zone IDs are
37  *   dynamically generated when the zone is created; if a persistent
38  *   identifier is needed (core files, accounting logs, audit trail,
39  *   etc.), the zone name should be used.
40  *
41  *
42  *   Global Zone:
43  *
44  *   The global zone (zoneid 0) is automatically associated with all
45  *   system resources that have not been bound to a user-created zone.
46  *   This means that even systems where zones are not in active use
47  *   have a global zone, and all processes, mounts, etc. are
48  *   associated with that zone.  The global zone is generally
49  *   unconstrained in terms of privileges and access, though the usual
50  *   credential and privilege based restrictions apply.
51  *
52  *
53  *   Zone States:
54  *
55  *   The states in which a zone may be in and the transitions are as
56  *   follows:
57  *
58  *   ZONE_IS_UNINITIALIZED: primordial state for a zone. The partially
59  *   initialized zone is added to the list of active zones on the system but
60  *   isn't accessible.
61  *
62  *   ZONE_IS_INITIALIZED: Initialization complete except the ZSD callbacks are
63  *   not yet completed. Not possible to enter the zone, but attributes can
64  *   be retrieved.
65  *
66  *   ZONE_IS_READY: zsched (the kernel dummy process for a zone) is
67  *   ready.  The zone is made visible after the ZSD constructor callbacks are
68  *   executed.  A zone remains in this state until it transitions into
69  *   the ZONE_IS_BOOTING state as a result of a call to zone_boot().
70  *
71  *   ZONE_IS_BOOTING: in this shortlived-state, zsched attempts to start
72  *   init.  Should that fail, the zone proceeds to the ZONE_IS_SHUTTING_DOWN
73  *   state.
74  *
75  *   ZONE_IS_RUNNING: The zone is open for business: zsched has
76  *   successfully started init.   A zone remains in this state until
77  *   zone_shutdown() is called.
78  *
79  *   ZONE_IS_SHUTTING_DOWN: zone_shutdown() has been called, the system is
80  *   killing all processes running in the zone. The zone remains
81  *   in this state until there are no more user processes running in the zone.
82  *   zone_create(), zone_enter(), and zone_destroy() on this zone will fail.
83  *   Since zone_shutdown() is restartable, it may be called successfully
84  *   multiple times for the same zone_t.  Setting of the zone's state to
85  *   ZONE_IS_SHUTTING_DOWN is synchronized with mounts, so VOP_MOUNT() may check
86  *   the zone's status without worrying about it being a moving target.
87  *
88  *   ZONE_IS_EMPTY: zone_shutdown() has been called, and there
89  *   are no more user processes in the zone.  The zone remains in this
90  *   state until there are no more kernel threads associated with the
91  *   zone.  zone_create(), zone_enter(), and zone_destroy() on this zone will
92  *   fail.
93  *
94  *   ZONE_IS_DOWN: All kernel threads doing work on behalf of the zone
95  *   have exited.  zone_shutdown() returns.  Henceforth it is not possible to
96  *   join the zone or create kernel threads therein.
97  *
98  *   ZONE_IS_DYING: zone_destroy() has been called on the zone; zone
99  *   remains in this state until zsched exits.  Calls to zone_find_by_*()
100  *   return NULL from now on.
101  *
102  *   ZONE_IS_DEAD: zsched has exited (zone_ntasks == 0).  There are no
103  *   processes or threads doing work on behalf of the zone.  The zone is
104  *   removed from the list of active zones.  zone_destroy() returns, and
105  *   the zone can be recreated.
106  *
107  *   ZONE_IS_FREE (internal state): zone_ref goes to 0, ZSD destructor
108  *   callbacks are executed, and all memory associated with the zone is
109  *   freed.
110  *
111  *   Threads can wait for the zone to enter a requested state by using
112  *   zone_status_wait() or zone_status_timedwait() with the desired
113  *   state passed in as an argument.  Zone state transitions are
114  *   uni-directional; it is not possible to move back to an earlier state.
115  *
116  *
117  *   Zone-Specific Data:
118  *
119  *   Subsystems needing to maintain zone-specific data can store that
120  *   data using the ZSD mechanism.  This provides a zone-specific data
121  *   store, similar to thread-specific data (see pthread_getspecific(3C)
122  *   or the TSD code in uts/common/disp/thread.c.  Also, ZSD can be used
123  *   to register callbacks to be invoked when a zone is created, shut
124  *   down, or destroyed.  This can be used to initialize zone-specific
125  *   data for new zones and to clean up when zones go away.
126  *
127  *
128  *   Data Structures:
129  *
130  *   The per-zone structure (zone_t) is reference counted, and freed
131  *   when all references are released.  zone_hold and zone_rele can be
132  *   used to adjust the reference count.  In addition, reference counts
133  *   associated with the cred_t structure are tracked separately using
134  *   zone_cred_hold and zone_cred_rele.
135  *
136  *   Pointers to active zone_t's are stored in two hash tables; one
137  *   for searching by id, the other for searching by name.  Lookups
138  *   can be performed on either basis, using zone_find_by_id and
139  *   zone_find_by_name.  Both return zone_t pointers with the zone
140  *   held, so zone_rele should be called when the pointer is no longer
141  *   needed.  Zones can also be searched by path; zone_find_by_path
142  *   returns the zone with which a path name is associated (global
143  *   zone if the path is not within some other zone's file system
144  *   hierarchy).  This currently requires iterating through each zone,
145  *   so it is slower than an id or name search via a hash table.
146  *
147  *
148  *   Locking:
149  *
150  *   zonehash_lock: This is a top-level global lock used to protect the
151  *       zone hash tables and lists.  Zones cannot be created or destroyed
152  *       while this lock is held.
153  *   zone_status_lock: This is a global lock protecting zone state.
154  *       Zones cannot change state while this lock is held.  It also
155  *       protects the list of kernel threads associated with a zone.
156  *   zone_lock: This is a per-zone lock used to protect several fields of
157  *       the zone_t (see <sys/zone.h> for details).  In addition, holding
158  *       this lock means that the zone cannot go away.
159  *   zone_nlwps_lock: This is a per-zone lock used to protect the fields
160  *	 related to the zone.max-lwps rctl.
161  *   zone_mem_lock: This is a per-zone lock used to protect the fields
162  *	 related to the zone.max-locked-memory and zone.max-swap rctls.
163  *   zone_rctl_lock: This is a per-zone lock used to protect other rctls,
164  *       currently just max_lofi
165  *   zsd_key_lock: This is a global lock protecting the key state for ZSD.
166  *   zone_deathrow_lock: This is a global lock protecting the "deathrow"
167  *       list (a list of zones in the ZONE_IS_DEAD state).
168  *
169  *   Ordering requirements:
170  *       pool_lock --> cpu_lock --> zonehash_lock --> zone_status_lock -->
171  *       	zone_lock --> zsd_key_lock --> pidlock --> p_lock
172  *
173  *   When taking zone_mem_lock or zone_nlwps_lock, the lock ordering is:
174  *	zonehash_lock --> a_lock --> pidlock --> p_lock --> zone_mem_lock
175  *	zonehash_lock --> a_lock --> pidlock --> p_lock --> zone_nlwps_lock
176  *
177  *   Blocking memory allocations are permitted while holding any of the
178  *   zone locks.
179  *
180  *
181  *   System Call Interface:
182  *
183  *   The zone subsystem can be managed and queried from user level with
184  *   the following system calls (all subcodes of the primary "zone"
185  *   system call):
186  *   - zone_create: creates a zone with selected attributes (name,
187  *     root path, privileges, resource controls, ZFS datasets)
188  *   - zone_enter: allows the current process to enter a zone
189  *   - zone_getattr: reports attributes of a zone
190  *   - zone_setattr: set attributes of a zone
191  *   - zone_boot: set 'init' running for the zone
192  *   - zone_list: lists all zones active in the system
193  *   - zone_lookup: looks up zone id based on name
194  *   - zone_shutdown: initiates shutdown process (see states above)
195  *   - zone_destroy: completes shutdown process (see states above)
196  *
197  */
198 
199 #include <sys/priv_impl.h>
200 #include <sys/cred.h>
201 #include <c2/audit.h>
202 #include <sys/debug.h>
203 #include <sys/file.h>
204 #include <sys/kmem.h>
205 #include <sys/kstat.h>
206 #include <sys/mutex.h>
207 #include <sys/note.h>
208 #include <sys/pathname.h>
209 #include <sys/proc.h>
210 #include <sys/project.h>
211 #include <sys/sysevent.h>
212 #include <sys/task.h>
213 #include <sys/systm.h>
214 #include <sys/types.h>
215 #include <sys/utsname.h>
216 #include <sys/vnode.h>
217 #include <sys/vfs.h>
218 #include <sys/systeminfo.h>
219 #include <sys/policy.h>
220 #include <sys/cred_impl.h>
221 #include <sys/contract_impl.h>
222 #include <sys/contract/process_impl.h>
223 #include <sys/class.h>
224 #include <sys/pool.h>
225 #include <sys/pool_pset.h>
226 #include <sys/pset.h>
227 #include <sys/strlog.h>
228 #include <sys/sysmacros.h>
229 #include <sys/callb.h>
230 #include <sys/vmparam.h>
231 #include <sys/corectl.h>
232 #include <sys/ipc_impl.h>
233 #include <sys/klpd.h>
234 
235 #include <sys/door.h>
236 #include <sys/cpuvar.h>
237 #include <sys/sdt.h>
238 
239 #include <sys/uadmin.h>
240 #include <sys/session.h>
241 #include <sys/cmn_err.h>
242 #include <sys/modhash.h>
243 #include <sys/sunddi.h>
244 #include <sys/nvpair.h>
245 #include <sys/rctl.h>
246 #include <sys/fss.h>
247 #include <sys/brand.h>
248 #include <sys/zone.h>
249 #include <net/if.h>
250 #include <sys/cpucaps.h>
251 #include <vm/seg.h>
252 #include <sys/mac.h>
253 
254 /*
255  * This constant specifies the number of seconds that threads waiting for
256  * subsystems to release a zone's general-purpose references will wait before
257  * they log the zone's reference counts.  The constant's value shouldn't
258  * be so small that reference counts are unnecessarily reported for zones
259  * whose references are slowly released.  On the other hand, it shouldn't be so
260  * large that users reboot their systems out of frustration over hung zones
261  * before the system logs the zones' reference counts.
262  */
263 #define	ZONE_DESTROY_TIMEOUT_SECS	60
264 
265 /* List of data link IDs which are accessible from the zone */
266 typedef struct zone_dl {
267 	datalink_id_t	zdl_id;
268 	nvlist_t	*zdl_net;
269 	list_node_t	zdl_linkage;
270 } zone_dl_t;
271 
272 /*
273  * cv used to signal that all references to the zone have been released.  This
274  * needs to be global since there may be multiple waiters, and the first to
275  * wake up will free the zone_t, hence we cannot use zone->zone_cv.
276  */
277 static kcondvar_t zone_destroy_cv;
278 /*
279  * Lock used to serialize access to zone_cv.  This could have been per-zone,
280  * but then we'd need another lock for zone_destroy_cv, and why bother?
281  */
282 static kmutex_t zone_status_lock;
283 
284 /*
285  * ZSD-related global variables.
286  */
287 static kmutex_t zsd_key_lock;	/* protects the following two */
288 /*
289  * The next caller of zone_key_create() will be assigned a key of ++zsd_keyval.
290  */
291 static zone_key_t zsd_keyval = 0;
292 /*
293  * Global list of registered keys.  We use this when a new zone is created.
294  */
295 static list_t zsd_registered_keys;
296 
297 int zone_hash_size = 256;
298 static mod_hash_t *zonehashbyname, *zonehashbyid, *zonehashbylabel;
299 static kmutex_t zonehash_lock;
300 static uint_t zonecount;
301 static id_space_t *zoneid_space;
302 
303 /*
304  * The global zone (aka zone0) is the all-seeing, all-knowing zone in which the
305  * kernel proper runs, and which manages all other zones.
306  *
307  * Although not declared as static, the variable "zone0" should not be used
308  * except for by code that needs to reference the global zone early on in boot,
309  * before it is fully initialized.  All other consumers should use
310  * 'global_zone'.
311  */
312 zone_t zone0;
313 zone_t *global_zone = NULL;	/* Set when the global zone is initialized */
314 
315 /*
316  * List of active zones, protected by zonehash_lock.
317  */
318 static list_t zone_active;
319 
320 /*
321  * List of destroyed zones that still have outstanding cred references.
322  * Used for debugging.  Uses a separate lock to avoid lock ordering
323  * problems in zone_free.
324  */
325 static list_t zone_deathrow;
326 static kmutex_t zone_deathrow_lock;
327 
328 /* number of zones is limited by virtual interface limit in IP */
329 uint_t maxzones = 8192;
330 
331 /* Event channel to sent zone state change notifications */
332 evchan_t *zone_event_chan;
333 
334 /*
335  * This table holds the mapping from kernel zone states to
336  * states visible in the state notification API.
337  * The idea is that we only expose "obvious" states and
338  * do not expose states which are just implementation details.
339  */
340 const char  *zone_status_table[] = {
341 	ZONE_EVENT_UNINITIALIZED,	/* uninitialized */
342 	ZONE_EVENT_INITIALIZED,		/* initialized */
343 	ZONE_EVENT_READY,		/* ready */
344 	ZONE_EVENT_READY,		/* booting */
345 	ZONE_EVENT_RUNNING,		/* running */
346 	ZONE_EVENT_SHUTTING_DOWN,	/* shutting_down */
347 	ZONE_EVENT_SHUTTING_DOWN,	/* empty */
348 	ZONE_EVENT_SHUTTING_DOWN,	/* down */
349 	ZONE_EVENT_SHUTTING_DOWN,	/* dying */
350 	ZONE_EVENT_UNINITIALIZED,	/* dead */
351 };
352 
353 /*
354  * This array contains the names of the subsystems listed in zone_ref_subsys_t
355  * (see sys/zone.h).
356  */
357 static char *zone_ref_subsys_names[] = {
358 	"NFS",		/* ZONE_REF_NFS */
359 	"NFSv4",	/* ZONE_REF_NFSV4 */
360 	"SMBFS",	/* ZONE_REF_SMBFS */
361 	"MNTFS",	/* ZONE_REF_MNTFS */
362 	"LOFI",		/* ZONE_REF_LOFI */
363 	"VFS",		/* ZONE_REF_VFS */
364 	"IPC"		/* ZONE_REF_IPC */
365 };
366 
367 /*
368  * This isn't static so lint doesn't complain.
369  */
370 rctl_hndl_t rc_zone_cpu_shares;
371 rctl_hndl_t rc_zone_locked_mem;
372 rctl_hndl_t rc_zone_max_swap;
373 rctl_hndl_t rc_zone_max_lofi;
374 rctl_hndl_t rc_zone_cpu_cap;
375 rctl_hndl_t rc_zone_nlwps;
376 rctl_hndl_t rc_zone_nprocs;
377 rctl_hndl_t rc_zone_shmmax;
378 rctl_hndl_t rc_zone_shmmni;
379 rctl_hndl_t rc_zone_semmni;
380 rctl_hndl_t rc_zone_msgmni;
381 
382 const char * const zone_default_initname = "/sbin/init";
383 static char * const zone_prefix = "/zone/";
384 static int zone_shutdown(zoneid_t zoneid);
385 static int zone_add_datalink(zoneid_t, datalink_id_t);
386 static int zone_remove_datalink(zoneid_t, datalink_id_t);
387 static int zone_list_datalink(zoneid_t, int *, datalink_id_t *);
388 static int zone_set_network(zoneid_t, zone_net_data_t *);
389 static int zone_get_network(zoneid_t, zone_net_data_t *);
390 
391 typedef boolean_t zsd_applyfn_t(kmutex_t *, boolean_t, zone_t *, zone_key_t);
392 
393 static void zsd_apply_all_zones(zsd_applyfn_t *, zone_key_t);
394 static void zsd_apply_all_keys(zsd_applyfn_t *, zone_t *);
395 static boolean_t zsd_apply_create(kmutex_t *, boolean_t, zone_t *, zone_key_t);
396 static boolean_t zsd_apply_shutdown(kmutex_t *, boolean_t, zone_t *,
397     zone_key_t);
398 static boolean_t zsd_apply_destroy(kmutex_t *, boolean_t, zone_t *, zone_key_t);
399 static boolean_t zsd_wait_for_creator(zone_t *, struct zsd_entry *,
400     kmutex_t *);
401 static boolean_t zsd_wait_for_inprogress(zone_t *, struct zsd_entry *,
402     kmutex_t *);
403 
404 /*
405  * Bump this number when you alter the zone syscall interfaces; this is
406  * because we need to have support for previous API versions in libc
407  * to support patching; libc calls into the kernel to determine this number.
408  *
409  * Version 1 of the API is the version originally shipped with Solaris 10
410  * Version 2 alters the zone_create system call in order to support more
411  *     arguments by moving the args into a structure; and to do better
412  *     error reporting when zone_create() fails.
413  * Version 3 alters the zone_create system call in order to support the
414  *     import of ZFS datasets to zones.
415  * Version 4 alters the zone_create system call in order to support
416  *     Trusted Extensions.
417  * Version 5 alters the zone_boot system call, and converts its old
418  *     bootargs parameter to be set by the zone_setattr API instead.
419  * Version 6 adds the flag argument to zone_create.
420  */
421 static const int ZONE_SYSCALL_API_VERSION = 6;
422 
423 /*
424  * Certain filesystems (such as NFS and autofs) need to know which zone
425  * the mount is being placed in.  Because of this, we need to be able to
426  * ensure that a zone isn't in the process of being created/destroyed such
427  * that nfs_mount() thinks it is in the global/NGZ zone, while by the time
428  * it gets added the list of mounted zones, it ends up on the wrong zone's
429  * mount list. Since a zone can't reside on an NFS file system, we don't
430  * have to worry about the zonepath itself.
431  *
432  * The following functions: block_mounts()/resume_mounts() and
433  * mount_in_progress()/mount_completed() are used by zones and the VFS
434  * layer (respectively) to synchronize zone state transitions and new
435  * mounts within a zone. This syncronization is on a per-zone basis, so
436  * activity for one zone will not interfere with activity for another zone.
437  *
438  * The semantics are like a reader-reader lock such that there may
439  * either be multiple mounts (or zone state transitions, if that weren't
440  * serialized by zonehash_lock) in progress at the same time, but not
441  * both.
442  *
443  * We use cv's so the user can ctrl-C out of the operation if it's
444  * taking too long.
445  *
446  * The semantics are such that there is unfair bias towards the
447  * "current" operation.  This means that zone halt may starve if
448  * there is a rapid succession of new mounts coming in to the zone.
449  */
450 /*
451  * Prevent new mounts from progressing to the point of calling
452  * VFS_MOUNT().  If there are already mounts in this "region", wait for
453  * them to complete.
454  */
455 static int
456 block_mounts(zone_t *zp)
457 {
458 	int retval = 0;
459 
460 	/*
461 	 * Since it may block for a long time, block_mounts() shouldn't be
462 	 * called with zonehash_lock held.
463 	 */
464 	ASSERT(MUTEX_NOT_HELD(&zonehash_lock));
465 	mutex_enter(&zp->zone_mount_lock);
466 	while (zp->zone_mounts_in_progress > 0) {
467 		if (cv_wait_sig(&zp->zone_mount_cv, &zp->zone_mount_lock) == 0)
468 			goto signaled;
469 	}
470 	/*
471 	 * A negative value of mounts_in_progress indicates that mounts
472 	 * have been blocked by (-mounts_in_progress) different callers
473 	 * (remotely possible if two threads enter zone_shutdown at the same
474 	 * time).
475 	 */
476 	zp->zone_mounts_in_progress--;
477 	retval = 1;
478 signaled:
479 	mutex_exit(&zp->zone_mount_lock);
480 	return (retval);
481 }
482 
483 /*
484  * The VFS layer may progress with new mounts as far as we're concerned.
485  * Allow them to progress if we were the last obstacle.
486  */
487 static void
488 resume_mounts(zone_t *zp)
489 {
490 	mutex_enter(&zp->zone_mount_lock);
491 	if (++zp->zone_mounts_in_progress == 0)
492 		cv_broadcast(&zp->zone_mount_cv);
493 	mutex_exit(&zp->zone_mount_lock);
494 }
495 
496 /*
497  * The VFS layer is busy with a mount; this zone should wait until all
498  * of its mounts are completed to progress.
499  */
500 void
501 mount_in_progress(zone_t *zp)
502 {
503 	mutex_enter(&zp->zone_mount_lock);
504 	while (zp->zone_mounts_in_progress < 0)
505 		cv_wait(&zp->zone_mount_cv, &zp->zone_mount_lock);
506 	zp->zone_mounts_in_progress++;
507 	mutex_exit(&zp->zone_mount_lock);
508 }
509 
510 /*
511  * VFS is done with one mount; wake up any waiting block_mounts()
512  * callers if this is the last mount.
513  */
514 void
515 mount_completed(zone_t *zp)
516 {
517 	mutex_enter(&zp->zone_mount_lock);
518 	if (--zp->zone_mounts_in_progress == 0)
519 		cv_broadcast(&zp->zone_mount_cv);
520 	mutex_exit(&zp->zone_mount_lock);
521 }
522 
523 /*
524  * ZSD routines.
525  *
526  * Zone Specific Data (ZSD) is modeled after Thread Specific Data as
527  * defined by the pthread_key_create() and related interfaces.
528  *
529  * Kernel subsystems may register one or more data items and/or
530  * callbacks to be executed when a zone is created, shutdown, or
531  * destroyed.
532  *
533  * Unlike the thread counterpart, destructor callbacks will be executed
534  * even if the data pointer is NULL and/or there are no constructor
535  * callbacks, so it is the responsibility of such callbacks to check for
536  * NULL data values if necessary.
537  *
538  * The locking strategy and overall picture is as follows:
539  *
540  * When someone calls zone_key_create(), a template ZSD entry is added to the
541  * global list "zsd_registered_keys", protected by zsd_key_lock.  While
542  * holding that lock all the existing zones are marked as
543  * ZSD_CREATE_NEEDED and a copy of the ZSD entry added to the per-zone
544  * zone_zsd list (protected by zone_lock). The global list is updated first
545  * (under zone_key_lock) to make sure that newly created zones use the
546  * most recent list of keys. Then under zonehash_lock we walk the zones
547  * and mark them.  Similar locking is used in zone_key_delete().
548  *
549  * The actual create, shutdown, and destroy callbacks are done without
550  * holding any lock. And zsd_flags are used to ensure that the operations
551  * completed so that when zone_key_create (and zone_create) is done, as well as
552  * zone_key_delete (and zone_destroy) is done, all the necessary callbacks
553  * are completed.
554  *
555  * When new zones are created constructor callbacks for all registered ZSD
556  * entries will be called. That also uses the above two phases of marking
557  * what needs to be done, and then running the callbacks without holding
558  * any locks.
559  *
560  * The framework does not provide any locking around zone_getspecific() and
561  * zone_setspecific() apart from that needed for internal consistency, so
562  * callers interested in atomic "test-and-set" semantics will need to provide
563  * their own locking.
564  */
565 
566 /*
567  * Helper function to find the zsd_entry associated with the key in the
568  * given list.
569  */
570 static struct zsd_entry *
571 zsd_find(list_t *l, zone_key_t key)
572 {
573 	struct zsd_entry *zsd;
574 
575 	for (zsd = list_head(l); zsd != NULL; zsd = list_next(l, zsd)) {
576 		if (zsd->zsd_key == key) {
577 			return (zsd);
578 		}
579 	}
580 	return (NULL);
581 }
582 
583 /*
584  * Helper function to find the zsd_entry associated with the key in the
585  * given list. Move it to the front of the list.
586  */
587 static struct zsd_entry *
588 zsd_find_mru(list_t *l, zone_key_t key)
589 {
590 	struct zsd_entry *zsd;
591 
592 	for (zsd = list_head(l); zsd != NULL; zsd = list_next(l, zsd)) {
593 		if (zsd->zsd_key == key) {
594 			/*
595 			 * Move to head of list to keep list in MRU order.
596 			 */
597 			if (zsd != list_head(l)) {
598 				list_remove(l, zsd);
599 				list_insert_head(l, zsd);
600 			}
601 			return (zsd);
602 		}
603 	}
604 	return (NULL);
605 }
606 
607 void
608 zone_key_create(zone_key_t *keyp, void *(*create)(zoneid_t),
609     void (*shutdown)(zoneid_t, void *), void (*destroy)(zoneid_t, void *))
610 {
611 	struct zsd_entry *zsdp;
612 	struct zsd_entry *t;
613 	struct zone *zone;
614 	zone_key_t  key;
615 
616 	zsdp = kmem_zalloc(sizeof (*zsdp), KM_SLEEP);
617 	zsdp->zsd_data = NULL;
618 	zsdp->zsd_create = create;
619 	zsdp->zsd_shutdown = shutdown;
620 	zsdp->zsd_destroy = destroy;
621 
622 	/*
623 	 * Insert in global list of callbacks. Makes future zone creations
624 	 * see it.
625 	 */
626 	mutex_enter(&zsd_key_lock);
627 	key = zsdp->zsd_key = ++zsd_keyval;
628 	ASSERT(zsd_keyval != 0);
629 	list_insert_tail(&zsd_registered_keys, zsdp);
630 	mutex_exit(&zsd_key_lock);
631 
632 	/*
633 	 * Insert for all existing zones and mark them as needing
634 	 * a create callback.
635 	 */
636 	mutex_enter(&zonehash_lock);	/* stop the world */
637 	for (zone = list_head(&zone_active); zone != NULL;
638 	    zone = list_next(&zone_active, zone)) {
639 		zone_status_t status;
640 
641 		mutex_enter(&zone->zone_lock);
642 
643 		/* Skip zones that are on the way down or not yet up */
644 		status = zone_status_get(zone);
645 		if (status >= ZONE_IS_DOWN ||
646 		    status == ZONE_IS_UNINITIALIZED) {
647 			mutex_exit(&zone->zone_lock);
648 			continue;
649 		}
650 
651 		t = zsd_find_mru(&zone->zone_zsd, key);
652 		if (t != NULL) {
653 			/*
654 			 * A zsd_configure already inserted it after
655 			 * we dropped zsd_key_lock above.
656 			 */
657 			mutex_exit(&zone->zone_lock);
658 			continue;
659 		}
660 		t = kmem_zalloc(sizeof (*t), KM_SLEEP);
661 		t->zsd_key = key;
662 		t->zsd_create = create;
663 		t->zsd_shutdown = shutdown;
664 		t->zsd_destroy = destroy;
665 		if (create != NULL) {
666 			t->zsd_flags = ZSD_CREATE_NEEDED;
667 			DTRACE_PROBE2(zsd__create__needed,
668 			    zone_t *, zone, zone_key_t, key);
669 		}
670 		list_insert_tail(&zone->zone_zsd, t);
671 		mutex_exit(&zone->zone_lock);
672 	}
673 	mutex_exit(&zonehash_lock);
674 
675 	if (create != NULL) {
676 		/* Now call the create callback for this key */
677 		zsd_apply_all_zones(zsd_apply_create, key);
678 	}
679 	/*
680 	 * It is safe for consumers to use the key now, make it
681 	 * globally visible. Specifically zone_getspecific() will
682 	 * always successfully return the zone specific data associated
683 	 * with the key.
684 	 */
685 	*keyp = key;
686 
687 }
688 
689 /*
690  * Function called when a module is being unloaded, or otherwise wishes
691  * to unregister its ZSD key and callbacks.
692  *
693  * Remove from the global list and determine the functions that need to
694  * be called under a global lock. Then call the functions without
695  * holding any locks. Finally free up the zone_zsd entries. (The apply
696  * functions need to access the zone_zsd entries to find zsd_data etc.)
697  */
698 int
699 zone_key_delete(zone_key_t key)
700 {
701 	struct zsd_entry *zsdp = NULL;
702 	zone_t *zone;
703 
704 	mutex_enter(&zsd_key_lock);
705 	zsdp = zsd_find_mru(&zsd_registered_keys, key);
706 	if (zsdp == NULL) {
707 		mutex_exit(&zsd_key_lock);
708 		return (-1);
709 	}
710 	list_remove(&zsd_registered_keys, zsdp);
711 	mutex_exit(&zsd_key_lock);
712 
713 	mutex_enter(&zonehash_lock);
714 	for (zone = list_head(&zone_active); zone != NULL;
715 	    zone = list_next(&zone_active, zone)) {
716 		struct zsd_entry *del;
717 
718 		mutex_enter(&zone->zone_lock);
719 		del = zsd_find_mru(&zone->zone_zsd, key);
720 		if (del == NULL) {
721 			/*
722 			 * Somebody else got here first e.g the zone going
723 			 * away.
724 			 */
725 			mutex_exit(&zone->zone_lock);
726 			continue;
727 		}
728 		ASSERT(del->zsd_shutdown == zsdp->zsd_shutdown);
729 		ASSERT(del->zsd_destroy == zsdp->zsd_destroy);
730 		if (del->zsd_shutdown != NULL &&
731 		    (del->zsd_flags & ZSD_SHUTDOWN_ALL) == 0) {
732 			del->zsd_flags |= ZSD_SHUTDOWN_NEEDED;
733 			DTRACE_PROBE2(zsd__shutdown__needed,
734 			    zone_t *, zone, zone_key_t, key);
735 		}
736 		if (del->zsd_destroy != NULL &&
737 		    (del->zsd_flags & ZSD_DESTROY_ALL) == 0) {
738 			del->zsd_flags |= ZSD_DESTROY_NEEDED;
739 			DTRACE_PROBE2(zsd__destroy__needed,
740 			    zone_t *, zone, zone_key_t, key);
741 		}
742 		mutex_exit(&zone->zone_lock);
743 	}
744 	mutex_exit(&zonehash_lock);
745 	kmem_free(zsdp, sizeof (*zsdp));
746 
747 	/* Now call the shutdown and destroy callback for this key */
748 	zsd_apply_all_zones(zsd_apply_shutdown, key);
749 	zsd_apply_all_zones(zsd_apply_destroy, key);
750 
751 	/* Now we can free up the zsdp structures in each zone */
752 	mutex_enter(&zonehash_lock);
753 	for (zone = list_head(&zone_active); zone != NULL;
754 	    zone = list_next(&zone_active, zone)) {
755 		struct zsd_entry *del;
756 
757 		mutex_enter(&zone->zone_lock);
758 		del = zsd_find(&zone->zone_zsd, key);
759 		if (del != NULL) {
760 			list_remove(&zone->zone_zsd, del);
761 			ASSERT(!(del->zsd_flags & ZSD_ALL_INPROGRESS));
762 			kmem_free(del, sizeof (*del));
763 		}
764 		mutex_exit(&zone->zone_lock);
765 	}
766 	mutex_exit(&zonehash_lock);
767 
768 	return (0);
769 }
770 
771 /*
772  * ZSD counterpart of pthread_setspecific().
773  *
774  * Since all zsd callbacks, including those with no create function,
775  * have an entry in zone_zsd, if the key is registered it is part of
776  * the zone_zsd list.
777  * Return an error if the key wasn't registerd.
778  */
779 int
780 zone_setspecific(zone_key_t key, zone_t *zone, const void *data)
781 {
782 	struct zsd_entry *t;
783 
784 	mutex_enter(&zone->zone_lock);
785 	t = zsd_find_mru(&zone->zone_zsd, key);
786 	if (t != NULL) {
787 		/*
788 		 * Replace old value with new
789 		 */
790 		t->zsd_data = (void *)data;
791 		mutex_exit(&zone->zone_lock);
792 		return (0);
793 	}
794 	mutex_exit(&zone->zone_lock);
795 	return (-1);
796 }
797 
798 /*
799  * ZSD counterpart of pthread_getspecific().
800  */
801 void *
802 zone_getspecific(zone_key_t key, zone_t *zone)
803 {
804 	struct zsd_entry *t;
805 	void *data;
806 
807 	mutex_enter(&zone->zone_lock);
808 	t = zsd_find_mru(&zone->zone_zsd, key);
809 	data = (t == NULL ? NULL : t->zsd_data);
810 	mutex_exit(&zone->zone_lock);
811 	return (data);
812 }
813 
814 /*
815  * Function used to initialize a zone's list of ZSD callbacks and data
816  * when the zone is being created.  The callbacks are initialized from
817  * the template list (zsd_registered_keys). The constructor callback is
818  * executed later (once the zone exists and with locks dropped).
819  */
820 static void
821 zone_zsd_configure(zone_t *zone)
822 {
823 	struct zsd_entry *zsdp;
824 	struct zsd_entry *t;
825 
826 	ASSERT(MUTEX_HELD(&zonehash_lock));
827 	ASSERT(list_head(&zone->zone_zsd) == NULL);
828 	mutex_enter(&zone->zone_lock);
829 	mutex_enter(&zsd_key_lock);
830 	for (zsdp = list_head(&zsd_registered_keys); zsdp != NULL;
831 	    zsdp = list_next(&zsd_registered_keys, zsdp)) {
832 		/*
833 		 * Since this zone is ZONE_IS_UNCONFIGURED, zone_key_create
834 		 * should not have added anything to it.
835 		 */
836 		ASSERT(zsd_find(&zone->zone_zsd, zsdp->zsd_key) == NULL);
837 
838 		t = kmem_zalloc(sizeof (*t), KM_SLEEP);
839 		t->zsd_key = zsdp->zsd_key;
840 		t->zsd_create = zsdp->zsd_create;
841 		t->zsd_shutdown = zsdp->zsd_shutdown;
842 		t->zsd_destroy = zsdp->zsd_destroy;
843 		if (zsdp->zsd_create != NULL) {
844 			t->zsd_flags = ZSD_CREATE_NEEDED;
845 			DTRACE_PROBE2(zsd__create__needed,
846 			    zone_t *, zone, zone_key_t, zsdp->zsd_key);
847 		}
848 		list_insert_tail(&zone->zone_zsd, t);
849 	}
850 	mutex_exit(&zsd_key_lock);
851 	mutex_exit(&zone->zone_lock);
852 }
853 
854 enum zsd_callback_type { ZSD_CREATE, ZSD_SHUTDOWN, ZSD_DESTROY };
855 
856 /*
857  * Helper function to execute shutdown or destructor callbacks.
858  */
859 static void
860 zone_zsd_callbacks(zone_t *zone, enum zsd_callback_type ct)
861 {
862 	struct zsd_entry *t;
863 
864 	ASSERT(ct == ZSD_SHUTDOWN || ct == ZSD_DESTROY);
865 	ASSERT(ct != ZSD_SHUTDOWN || zone_status_get(zone) >= ZONE_IS_EMPTY);
866 	ASSERT(ct != ZSD_DESTROY || zone_status_get(zone) >= ZONE_IS_DOWN);
867 
868 	/*
869 	 * Run the callback solely based on what is registered for the zone
870 	 * in zone_zsd. The global list can change independently of this
871 	 * as keys are registered and unregistered and we don't register new
872 	 * callbacks for a zone that is in the process of going away.
873 	 */
874 	mutex_enter(&zone->zone_lock);
875 	for (t = list_head(&zone->zone_zsd); t != NULL;
876 	    t = list_next(&zone->zone_zsd, t)) {
877 		zone_key_t key = t->zsd_key;
878 
879 		/* Skip if no callbacks registered */
880 
881 		if (ct == ZSD_SHUTDOWN) {
882 			if (t->zsd_shutdown != NULL &&
883 			    (t->zsd_flags & ZSD_SHUTDOWN_ALL) == 0) {
884 				t->zsd_flags |= ZSD_SHUTDOWN_NEEDED;
885 				DTRACE_PROBE2(zsd__shutdown__needed,
886 				    zone_t *, zone, zone_key_t, key);
887 			}
888 		} else {
889 			if (t->zsd_destroy != NULL &&
890 			    (t->zsd_flags & ZSD_DESTROY_ALL) == 0) {
891 				t->zsd_flags |= ZSD_DESTROY_NEEDED;
892 				DTRACE_PROBE2(zsd__destroy__needed,
893 				    zone_t *, zone, zone_key_t, key);
894 			}
895 		}
896 	}
897 	mutex_exit(&zone->zone_lock);
898 
899 	/* Now call the shutdown and destroy callback for this key */
900 	zsd_apply_all_keys(zsd_apply_shutdown, zone);
901 	zsd_apply_all_keys(zsd_apply_destroy, zone);
902 
903 }
904 
905 /*
906  * Called when the zone is going away; free ZSD-related memory, and
907  * destroy the zone_zsd list.
908  */
909 static void
910 zone_free_zsd(zone_t *zone)
911 {
912 	struct zsd_entry *t, *next;
913 
914 	/*
915 	 * Free all the zsd_entry's we had on this zone.
916 	 */
917 	mutex_enter(&zone->zone_lock);
918 	for (t = list_head(&zone->zone_zsd); t != NULL; t = next) {
919 		next = list_next(&zone->zone_zsd, t);
920 		list_remove(&zone->zone_zsd, t);
921 		ASSERT(!(t->zsd_flags & ZSD_ALL_INPROGRESS));
922 		kmem_free(t, sizeof (*t));
923 	}
924 	list_destroy(&zone->zone_zsd);
925 	mutex_exit(&zone->zone_lock);
926 
927 }
928 
929 /*
930  * Apply a function to all zones for particular key value.
931  *
932  * The applyfn has to drop zonehash_lock if it does some work, and
933  * then reacquire it before it returns.
934  * When the lock is dropped we don't follow list_next even
935  * if it is possible to do so without any hazards. This is
936  * because we want the design to allow for the list of zones
937  * to change in any arbitrary way during the time the
938  * lock was dropped.
939  *
940  * It is safe to restart the loop at list_head since the applyfn
941  * changes the zsd_flags as it does work, so a subsequent
942  * pass through will have no effect in applyfn, hence the loop will terminate
943  * in at worst O(N^2).
944  */
945 static void
946 zsd_apply_all_zones(zsd_applyfn_t *applyfn, zone_key_t key)
947 {
948 	zone_t *zone;
949 
950 	mutex_enter(&zonehash_lock);
951 	zone = list_head(&zone_active);
952 	while (zone != NULL) {
953 		if ((applyfn)(&zonehash_lock, B_FALSE, zone, key)) {
954 			/* Lock dropped - restart at head */
955 			zone = list_head(&zone_active);
956 		} else {
957 			zone = list_next(&zone_active, zone);
958 		}
959 	}
960 	mutex_exit(&zonehash_lock);
961 }
962 
963 /*
964  * Apply a function to all keys for a particular zone.
965  *
966  * The applyfn has to drop zonehash_lock if it does some work, and
967  * then reacquire it before it returns.
968  * When the lock is dropped we don't follow list_next even
969  * if it is possible to do so without any hazards. This is
970  * because we want the design to allow for the list of zsd callbacks
971  * to change in any arbitrary way during the time the
972  * lock was dropped.
973  *
974  * It is safe to restart the loop at list_head since the applyfn
975  * changes the zsd_flags as it does work, so a subsequent
976  * pass through will have no effect in applyfn, hence the loop will terminate
977  * in at worst O(N^2).
978  */
979 static void
980 zsd_apply_all_keys(zsd_applyfn_t *applyfn, zone_t *zone)
981 {
982 	struct zsd_entry *t;
983 
984 	mutex_enter(&zone->zone_lock);
985 	t = list_head(&zone->zone_zsd);
986 	while (t != NULL) {
987 		if ((applyfn)(NULL, B_TRUE, zone, t->zsd_key)) {
988 			/* Lock dropped - restart at head */
989 			t = list_head(&zone->zone_zsd);
990 		} else {
991 			t = list_next(&zone->zone_zsd, t);
992 		}
993 	}
994 	mutex_exit(&zone->zone_lock);
995 }
996 
997 /*
998  * Call the create function for the zone and key if CREATE_NEEDED
999  * is set.
1000  * If some other thread gets here first and sets CREATE_INPROGRESS, then
1001  * we wait for that thread to complete so that we can ensure that
1002  * all the callbacks are done when we've looped over all zones/keys.
1003  *
1004  * When we call the create function, we drop the global held by the
1005  * caller, and return true to tell the caller it needs to re-evalute the
1006  * state.
1007  * If the caller holds zone_lock then zone_lock_held is set, and zone_lock
1008  * remains held on exit.
1009  */
1010 static boolean_t
1011 zsd_apply_create(kmutex_t *lockp, boolean_t zone_lock_held,
1012     zone_t *zone, zone_key_t key)
1013 {
1014 	void *result;
1015 	struct zsd_entry *t;
1016 	boolean_t dropped;
1017 
1018 	if (lockp != NULL) {
1019 		ASSERT(MUTEX_HELD(lockp));
1020 	}
1021 	if (zone_lock_held) {
1022 		ASSERT(MUTEX_HELD(&zone->zone_lock));
1023 	} else {
1024 		mutex_enter(&zone->zone_lock);
1025 	}
1026 
1027 	t = zsd_find(&zone->zone_zsd, key);
1028 	if (t == NULL) {
1029 		/*
1030 		 * Somebody else got here first e.g the zone going
1031 		 * away.
1032 		 */
1033 		if (!zone_lock_held)
1034 			mutex_exit(&zone->zone_lock);
1035 		return (B_FALSE);
1036 	}
1037 	dropped = B_FALSE;
1038 	if (zsd_wait_for_inprogress(zone, t, lockp))
1039 		dropped = B_TRUE;
1040 
1041 	if (t->zsd_flags & ZSD_CREATE_NEEDED) {
1042 		t->zsd_flags &= ~ZSD_CREATE_NEEDED;
1043 		t->zsd_flags |= ZSD_CREATE_INPROGRESS;
1044 		DTRACE_PROBE2(zsd__create__inprogress,
1045 		    zone_t *, zone, zone_key_t, key);
1046 		mutex_exit(&zone->zone_lock);
1047 		if (lockp != NULL)
1048 			mutex_exit(lockp);
1049 
1050 		dropped = B_TRUE;
1051 		ASSERT(t->zsd_create != NULL);
1052 		DTRACE_PROBE2(zsd__create__start,
1053 		    zone_t *, zone, zone_key_t, key);
1054 
1055 		result = (*t->zsd_create)(zone->zone_id);
1056 
1057 		DTRACE_PROBE2(zsd__create__end,
1058 		    zone_t *, zone, voidn *, result);
1059 
1060 		ASSERT(result != NULL);
1061 		if (lockp != NULL)
1062 			mutex_enter(lockp);
1063 		mutex_enter(&zone->zone_lock);
1064 		t->zsd_data = result;
1065 		t->zsd_flags &= ~ZSD_CREATE_INPROGRESS;
1066 		t->zsd_flags |= ZSD_CREATE_COMPLETED;
1067 		cv_broadcast(&t->zsd_cv);
1068 		DTRACE_PROBE2(zsd__create__completed,
1069 		    zone_t *, zone, zone_key_t, key);
1070 	}
1071 	if (!zone_lock_held)
1072 		mutex_exit(&zone->zone_lock);
1073 	return (dropped);
1074 }
1075 
1076 /*
1077  * Call the shutdown function for the zone and key if SHUTDOWN_NEEDED
1078  * is set.
1079  * If some other thread gets here first and sets *_INPROGRESS, then
1080  * we wait for that thread to complete so that we can ensure that
1081  * all the callbacks are done when we've looped over all zones/keys.
1082  *
1083  * When we call the shutdown function, we drop the global held by the
1084  * caller, and return true to tell the caller it needs to re-evalute the
1085  * state.
1086  * If the caller holds zone_lock then zone_lock_held is set, and zone_lock
1087  * remains held on exit.
1088  */
1089 static boolean_t
1090 zsd_apply_shutdown(kmutex_t *lockp, boolean_t zone_lock_held,
1091     zone_t *zone, zone_key_t key)
1092 {
1093 	struct zsd_entry *t;
1094 	void *data;
1095 	boolean_t dropped;
1096 
1097 	if (lockp != NULL) {
1098 		ASSERT(MUTEX_HELD(lockp));
1099 	}
1100 	if (zone_lock_held) {
1101 		ASSERT(MUTEX_HELD(&zone->zone_lock));
1102 	} else {
1103 		mutex_enter(&zone->zone_lock);
1104 	}
1105 
1106 	t = zsd_find(&zone->zone_zsd, key);
1107 	if (t == NULL) {
1108 		/*
1109 		 * Somebody else got here first e.g the zone going
1110 		 * away.
1111 		 */
1112 		if (!zone_lock_held)
1113 			mutex_exit(&zone->zone_lock);
1114 		return (B_FALSE);
1115 	}
1116 	dropped = B_FALSE;
1117 	if (zsd_wait_for_creator(zone, t, lockp))
1118 		dropped = B_TRUE;
1119 
1120 	if (zsd_wait_for_inprogress(zone, t, lockp))
1121 		dropped = B_TRUE;
1122 
1123 	if (t->zsd_flags & ZSD_SHUTDOWN_NEEDED) {
1124 		t->zsd_flags &= ~ZSD_SHUTDOWN_NEEDED;
1125 		t->zsd_flags |= ZSD_SHUTDOWN_INPROGRESS;
1126 		DTRACE_PROBE2(zsd__shutdown__inprogress,
1127 		    zone_t *, zone, zone_key_t, key);
1128 		mutex_exit(&zone->zone_lock);
1129 		if (lockp != NULL)
1130 			mutex_exit(lockp);
1131 		dropped = B_TRUE;
1132 
1133 		ASSERT(t->zsd_shutdown != NULL);
1134 		data = t->zsd_data;
1135 
1136 		DTRACE_PROBE2(zsd__shutdown__start,
1137 		    zone_t *, zone, zone_key_t, key);
1138 
1139 		(t->zsd_shutdown)(zone->zone_id, data);
1140 		DTRACE_PROBE2(zsd__shutdown__end,
1141 		    zone_t *, zone, zone_key_t, key);
1142 
1143 		if (lockp != NULL)
1144 			mutex_enter(lockp);
1145 		mutex_enter(&zone->zone_lock);
1146 		t->zsd_flags &= ~ZSD_SHUTDOWN_INPROGRESS;
1147 		t->zsd_flags |= ZSD_SHUTDOWN_COMPLETED;
1148 		cv_broadcast(&t->zsd_cv);
1149 		DTRACE_PROBE2(zsd__shutdown__completed,
1150 		    zone_t *, zone, zone_key_t, key);
1151 	}
1152 	if (!zone_lock_held)
1153 		mutex_exit(&zone->zone_lock);
1154 	return (dropped);
1155 }
1156 
1157 /*
1158  * Call the destroy function for the zone and key if DESTROY_NEEDED
1159  * is set.
1160  * If some other thread gets here first and sets *_INPROGRESS, then
1161  * we wait for that thread to complete so that we can ensure that
1162  * all the callbacks are done when we've looped over all zones/keys.
1163  *
1164  * When we call the destroy function, we drop the global held by the
1165  * caller, and return true to tell the caller it needs to re-evalute the
1166  * state.
1167  * If the caller holds zone_lock then zone_lock_held is set, and zone_lock
1168  * remains held on exit.
1169  */
1170 static boolean_t
1171 zsd_apply_destroy(kmutex_t *lockp, boolean_t zone_lock_held,
1172     zone_t *zone, zone_key_t key)
1173 {
1174 	struct zsd_entry *t;
1175 	void *data;
1176 	boolean_t dropped;
1177 
1178 	if (lockp != NULL) {
1179 		ASSERT(MUTEX_HELD(lockp));
1180 	}
1181 	if (zone_lock_held) {
1182 		ASSERT(MUTEX_HELD(&zone->zone_lock));
1183 	} else {
1184 		mutex_enter(&zone->zone_lock);
1185 	}
1186 
1187 	t = zsd_find(&zone->zone_zsd, key);
1188 	if (t == NULL) {
1189 		/*
1190 		 * Somebody else got here first e.g the zone going
1191 		 * away.
1192 		 */
1193 		if (!zone_lock_held)
1194 			mutex_exit(&zone->zone_lock);
1195 		return (B_FALSE);
1196 	}
1197 	dropped = B_FALSE;
1198 	if (zsd_wait_for_creator(zone, t, lockp))
1199 		dropped = B_TRUE;
1200 
1201 	if (zsd_wait_for_inprogress(zone, t, lockp))
1202 		dropped = B_TRUE;
1203 
1204 	if (t->zsd_flags & ZSD_DESTROY_NEEDED) {
1205 		t->zsd_flags &= ~ZSD_DESTROY_NEEDED;
1206 		t->zsd_flags |= ZSD_DESTROY_INPROGRESS;
1207 		DTRACE_PROBE2(zsd__destroy__inprogress,
1208 		    zone_t *, zone, zone_key_t, key);
1209 		mutex_exit(&zone->zone_lock);
1210 		if (lockp != NULL)
1211 			mutex_exit(lockp);
1212 		dropped = B_TRUE;
1213 
1214 		ASSERT(t->zsd_destroy != NULL);
1215 		data = t->zsd_data;
1216 		DTRACE_PROBE2(zsd__destroy__start,
1217 		    zone_t *, zone, zone_key_t, key);
1218 
1219 		(t->zsd_destroy)(zone->zone_id, data);
1220 		DTRACE_PROBE2(zsd__destroy__end,
1221 		    zone_t *, zone, zone_key_t, key);
1222 
1223 		if (lockp != NULL)
1224 			mutex_enter(lockp);
1225 		mutex_enter(&zone->zone_lock);
1226 		t->zsd_data = NULL;
1227 		t->zsd_flags &= ~ZSD_DESTROY_INPROGRESS;
1228 		t->zsd_flags |= ZSD_DESTROY_COMPLETED;
1229 		cv_broadcast(&t->zsd_cv);
1230 		DTRACE_PROBE2(zsd__destroy__completed,
1231 		    zone_t *, zone, zone_key_t, key);
1232 	}
1233 	if (!zone_lock_held)
1234 		mutex_exit(&zone->zone_lock);
1235 	return (dropped);
1236 }
1237 
1238 /*
1239  * Wait for any CREATE_NEEDED flag to be cleared.
1240  * Returns true if lockp was temporarily dropped while waiting.
1241  */
1242 static boolean_t
1243 zsd_wait_for_creator(zone_t *zone, struct zsd_entry *t, kmutex_t *lockp)
1244 {
1245 	boolean_t dropped = B_FALSE;
1246 
1247 	while (t->zsd_flags & ZSD_CREATE_NEEDED) {
1248 		DTRACE_PROBE2(zsd__wait__for__creator,
1249 		    zone_t *, zone, struct zsd_entry *, t);
1250 		if (lockp != NULL) {
1251 			dropped = B_TRUE;
1252 			mutex_exit(lockp);
1253 		}
1254 		cv_wait(&t->zsd_cv, &zone->zone_lock);
1255 		if (lockp != NULL) {
1256 			/* First drop zone_lock to preserve order */
1257 			mutex_exit(&zone->zone_lock);
1258 			mutex_enter(lockp);
1259 			mutex_enter(&zone->zone_lock);
1260 		}
1261 	}
1262 	return (dropped);
1263 }
1264 
1265 /*
1266  * Wait for any INPROGRESS flag to be cleared.
1267  * Returns true if lockp was temporarily dropped while waiting.
1268  */
1269 static boolean_t
1270 zsd_wait_for_inprogress(zone_t *zone, struct zsd_entry *t, kmutex_t *lockp)
1271 {
1272 	boolean_t dropped = B_FALSE;
1273 
1274 	while (t->zsd_flags & ZSD_ALL_INPROGRESS) {
1275 		DTRACE_PROBE2(zsd__wait__for__inprogress,
1276 		    zone_t *, zone, struct zsd_entry *, t);
1277 		if (lockp != NULL) {
1278 			dropped = B_TRUE;
1279 			mutex_exit(lockp);
1280 		}
1281 		cv_wait(&t->zsd_cv, &zone->zone_lock);
1282 		if (lockp != NULL) {
1283 			/* First drop zone_lock to preserve order */
1284 			mutex_exit(&zone->zone_lock);
1285 			mutex_enter(lockp);
1286 			mutex_enter(&zone->zone_lock);
1287 		}
1288 	}
1289 	return (dropped);
1290 }
1291 
1292 /*
1293  * Frees memory associated with the zone dataset list.
1294  */
1295 static void
1296 zone_free_datasets(zone_t *zone)
1297 {
1298 	zone_dataset_t *t, *next;
1299 
1300 	for (t = list_head(&zone->zone_datasets); t != NULL; t = next) {
1301 		next = list_next(&zone->zone_datasets, t);
1302 		list_remove(&zone->zone_datasets, t);
1303 		kmem_free(t->zd_dataset, strlen(t->zd_dataset) + 1);
1304 		kmem_free(t, sizeof (*t));
1305 	}
1306 	list_destroy(&zone->zone_datasets);
1307 }
1308 
1309 /*
1310  * zone.cpu-shares resource control support.
1311  */
1312 /*ARGSUSED*/
1313 static rctl_qty_t
1314 zone_cpu_shares_usage(rctl_t *rctl, struct proc *p)
1315 {
1316 	ASSERT(MUTEX_HELD(&p->p_lock));
1317 	return (p->p_zone->zone_shares);
1318 }
1319 
1320 /*ARGSUSED*/
1321 static int
1322 zone_cpu_shares_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
1323     rctl_qty_t nv)
1324 {
1325 	ASSERT(MUTEX_HELD(&p->p_lock));
1326 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1327 	if (e->rcep_p.zone == NULL)
1328 		return (0);
1329 
1330 	e->rcep_p.zone->zone_shares = nv;
1331 	return (0);
1332 }
1333 
1334 static rctl_ops_t zone_cpu_shares_ops = {
1335 	rcop_no_action,
1336 	zone_cpu_shares_usage,
1337 	zone_cpu_shares_set,
1338 	rcop_no_test
1339 };
1340 
1341 /*
1342  * zone.cpu-cap resource control support.
1343  */
1344 /*ARGSUSED*/
1345 static rctl_qty_t
1346 zone_cpu_cap_get(rctl_t *rctl, struct proc *p)
1347 {
1348 	ASSERT(MUTEX_HELD(&p->p_lock));
1349 	return (cpucaps_zone_get(p->p_zone));
1350 }
1351 
1352 /*ARGSUSED*/
1353 static int
1354 zone_cpu_cap_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
1355     rctl_qty_t nv)
1356 {
1357 	zone_t *zone = e->rcep_p.zone;
1358 
1359 	ASSERT(MUTEX_HELD(&p->p_lock));
1360 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1361 
1362 	if (zone == NULL)
1363 		return (0);
1364 
1365 	/*
1366 	 * set cap to the new value.
1367 	 */
1368 	return (cpucaps_zone_set(zone, nv));
1369 }
1370 
1371 static rctl_ops_t zone_cpu_cap_ops = {
1372 	rcop_no_action,
1373 	zone_cpu_cap_get,
1374 	zone_cpu_cap_set,
1375 	rcop_no_test
1376 };
1377 
1378 /*ARGSUSED*/
1379 static rctl_qty_t
1380 zone_lwps_usage(rctl_t *r, proc_t *p)
1381 {
1382 	rctl_qty_t nlwps;
1383 	zone_t *zone = p->p_zone;
1384 
1385 	ASSERT(MUTEX_HELD(&p->p_lock));
1386 
1387 	mutex_enter(&zone->zone_nlwps_lock);
1388 	nlwps = zone->zone_nlwps;
1389 	mutex_exit(&zone->zone_nlwps_lock);
1390 
1391 	return (nlwps);
1392 }
1393 
1394 /*ARGSUSED*/
1395 static int
1396 zone_lwps_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e, rctl_val_t *rcntl,
1397     rctl_qty_t incr, uint_t flags)
1398 {
1399 	rctl_qty_t nlwps;
1400 
1401 	ASSERT(MUTEX_HELD(&p->p_lock));
1402 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1403 	if (e->rcep_p.zone == NULL)
1404 		return (0);
1405 	ASSERT(MUTEX_HELD(&(e->rcep_p.zone->zone_nlwps_lock)));
1406 	nlwps = e->rcep_p.zone->zone_nlwps;
1407 
1408 	if (nlwps + incr > rcntl->rcv_value)
1409 		return (1);
1410 
1411 	return (0);
1412 }
1413 
1414 /*ARGSUSED*/
1415 static int
1416 zone_lwps_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e, rctl_qty_t nv)
1417 {
1418 	ASSERT(MUTEX_HELD(&p->p_lock));
1419 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1420 	if (e->rcep_p.zone == NULL)
1421 		return (0);
1422 	e->rcep_p.zone->zone_nlwps_ctl = nv;
1423 	return (0);
1424 }
1425 
1426 static rctl_ops_t zone_lwps_ops = {
1427 	rcop_no_action,
1428 	zone_lwps_usage,
1429 	zone_lwps_set,
1430 	zone_lwps_test,
1431 };
1432 
1433 /*ARGSUSED*/
1434 static rctl_qty_t
1435 zone_procs_usage(rctl_t *r, proc_t *p)
1436 {
1437 	rctl_qty_t nprocs;
1438 	zone_t *zone = p->p_zone;
1439 
1440 	ASSERT(MUTEX_HELD(&p->p_lock));
1441 
1442 	mutex_enter(&zone->zone_nlwps_lock);
1443 	nprocs = zone->zone_nprocs;
1444 	mutex_exit(&zone->zone_nlwps_lock);
1445 
1446 	return (nprocs);
1447 }
1448 
1449 /*ARGSUSED*/
1450 static int
1451 zone_procs_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e, rctl_val_t *rcntl,
1452     rctl_qty_t incr, uint_t flags)
1453 {
1454 	rctl_qty_t nprocs;
1455 
1456 	ASSERT(MUTEX_HELD(&p->p_lock));
1457 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1458 	if (e->rcep_p.zone == NULL)
1459 		return (0);
1460 	ASSERT(MUTEX_HELD(&(e->rcep_p.zone->zone_nlwps_lock)));
1461 	nprocs = e->rcep_p.zone->zone_nprocs;
1462 
1463 	if (nprocs + incr > rcntl->rcv_value)
1464 		return (1);
1465 
1466 	return (0);
1467 }
1468 
1469 /*ARGSUSED*/
1470 static int
1471 zone_procs_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e, rctl_qty_t nv)
1472 {
1473 	ASSERT(MUTEX_HELD(&p->p_lock));
1474 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1475 	if (e->rcep_p.zone == NULL)
1476 		return (0);
1477 	e->rcep_p.zone->zone_nprocs_ctl = nv;
1478 	return (0);
1479 }
1480 
1481 static rctl_ops_t zone_procs_ops = {
1482 	rcop_no_action,
1483 	zone_procs_usage,
1484 	zone_procs_set,
1485 	zone_procs_test,
1486 };
1487 
1488 /*ARGSUSED*/
1489 static int
1490 zone_shmmax_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e, rctl_val_t *rval,
1491     rctl_qty_t incr, uint_t flags)
1492 {
1493 	rctl_qty_t v;
1494 	ASSERT(MUTEX_HELD(&p->p_lock));
1495 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1496 	v = e->rcep_p.zone->zone_shmmax + incr;
1497 	if (v > rval->rcv_value)
1498 		return (1);
1499 	return (0);
1500 }
1501 
1502 static rctl_ops_t zone_shmmax_ops = {
1503 	rcop_no_action,
1504 	rcop_no_usage,
1505 	rcop_no_set,
1506 	zone_shmmax_test
1507 };
1508 
1509 /*ARGSUSED*/
1510 static int
1511 zone_shmmni_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e, rctl_val_t *rval,
1512     rctl_qty_t incr, uint_t flags)
1513 {
1514 	rctl_qty_t v;
1515 	ASSERT(MUTEX_HELD(&p->p_lock));
1516 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1517 	v = e->rcep_p.zone->zone_ipc.ipcq_shmmni + incr;
1518 	if (v > rval->rcv_value)
1519 		return (1);
1520 	return (0);
1521 }
1522 
1523 static rctl_ops_t zone_shmmni_ops = {
1524 	rcop_no_action,
1525 	rcop_no_usage,
1526 	rcop_no_set,
1527 	zone_shmmni_test
1528 };
1529 
1530 /*ARGSUSED*/
1531 static int
1532 zone_semmni_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e, rctl_val_t *rval,
1533     rctl_qty_t incr, uint_t flags)
1534 {
1535 	rctl_qty_t v;
1536 	ASSERT(MUTEX_HELD(&p->p_lock));
1537 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1538 	v = e->rcep_p.zone->zone_ipc.ipcq_semmni + incr;
1539 	if (v > rval->rcv_value)
1540 		return (1);
1541 	return (0);
1542 }
1543 
1544 static rctl_ops_t zone_semmni_ops = {
1545 	rcop_no_action,
1546 	rcop_no_usage,
1547 	rcop_no_set,
1548 	zone_semmni_test
1549 };
1550 
1551 /*ARGSUSED*/
1552 static int
1553 zone_msgmni_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e, rctl_val_t *rval,
1554     rctl_qty_t incr, uint_t flags)
1555 {
1556 	rctl_qty_t v;
1557 	ASSERT(MUTEX_HELD(&p->p_lock));
1558 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1559 	v = e->rcep_p.zone->zone_ipc.ipcq_msgmni + incr;
1560 	if (v > rval->rcv_value)
1561 		return (1);
1562 	return (0);
1563 }
1564 
1565 static rctl_ops_t zone_msgmni_ops = {
1566 	rcop_no_action,
1567 	rcop_no_usage,
1568 	rcop_no_set,
1569 	zone_msgmni_test
1570 };
1571 
1572 /*ARGSUSED*/
1573 static rctl_qty_t
1574 zone_locked_mem_usage(rctl_t *rctl, struct proc *p)
1575 {
1576 	rctl_qty_t q;
1577 	ASSERT(MUTEX_HELD(&p->p_lock));
1578 	mutex_enter(&p->p_zone->zone_mem_lock);
1579 	q = p->p_zone->zone_locked_mem;
1580 	mutex_exit(&p->p_zone->zone_mem_lock);
1581 	return (q);
1582 }
1583 
1584 /*ARGSUSED*/
1585 static int
1586 zone_locked_mem_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e,
1587     rctl_val_t *rcntl, rctl_qty_t incr, uint_t flags)
1588 {
1589 	rctl_qty_t q;
1590 	zone_t *z;
1591 
1592 	z = e->rcep_p.zone;
1593 	ASSERT(MUTEX_HELD(&p->p_lock));
1594 	ASSERT(MUTEX_HELD(&z->zone_mem_lock));
1595 	q = z->zone_locked_mem;
1596 	if (q + incr > rcntl->rcv_value)
1597 		return (1);
1598 	return (0);
1599 }
1600 
1601 /*ARGSUSED*/
1602 static int
1603 zone_locked_mem_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
1604     rctl_qty_t nv)
1605 {
1606 	ASSERT(MUTEX_HELD(&p->p_lock));
1607 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1608 	if (e->rcep_p.zone == NULL)
1609 		return (0);
1610 	e->rcep_p.zone->zone_locked_mem_ctl = nv;
1611 	return (0);
1612 }
1613 
1614 static rctl_ops_t zone_locked_mem_ops = {
1615 	rcop_no_action,
1616 	zone_locked_mem_usage,
1617 	zone_locked_mem_set,
1618 	zone_locked_mem_test
1619 };
1620 
1621 /*ARGSUSED*/
1622 static rctl_qty_t
1623 zone_max_swap_usage(rctl_t *rctl, struct proc *p)
1624 {
1625 	rctl_qty_t q;
1626 	zone_t *z = p->p_zone;
1627 
1628 	ASSERT(MUTEX_HELD(&p->p_lock));
1629 	mutex_enter(&z->zone_mem_lock);
1630 	q = z->zone_max_swap;
1631 	mutex_exit(&z->zone_mem_lock);
1632 	return (q);
1633 }
1634 
1635 /*ARGSUSED*/
1636 static int
1637 zone_max_swap_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e,
1638     rctl_val_t *rcntl, rctl_qty_t incr, uint_t flags)
1639 {
1640 	rctl_qty_t q;
1641 	zone_t *z;
1642 
1643 	z = e->rcep_p.zone;
1644 	ASSERT(MUTEX_HELD(&p->p_lock));
1645 	ASSERT(MUTEX_HELD(&z->zone_mem_lock));
1646 	q = z->zone_max_swap;
1647 	if (q + incr > rcntl->rcv_value)
1648 		return (1);
1649 	return (0);
1650 }
1651 
1652 /*ARGSUSED*/
1653 static int
1654 zone_max_swap_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
1655     rctl_qty_t nv)
1656 {
1657 	ASSERT(MUTEX_HELD(&p->p_lock));
1658 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1659 	if (e->rcep_p.zone == NULL)
1660 		return (0);
1661 	e->rcep_p.zone->zone_max_swap_ctl = nv;
1662 	return (0);
1663 }
1664 
1665 static rctl_ops_t zone_max_swap_ops = {
1666 	rcop_no_action,
1667 	zone_max_swap_usage,
1668 	zone_max_swap_set,
1669 	zone_max_swap_test
1670 };
1671 
1672 /*ARGSUSED*/
1673 static rctl_qty_t
1674 zone_max_lofi_usage(rctl_t *rctl, struct proc *p)
1675 {
1676 	rctl_qty_t q;
1677 	zone_t *z = p->p_zone;
1678 
1679 	ASSERT(MUTEX_HELD(&p->p_lock));
1680 	mutex_enter(&z->zone_rctl_lock);
1681 	q = z->zone_max_lofi;
1682 	mutex_exit(&z->zone_rctl_lock);
1683 	return (q);
1684 }
1685 
1686 /*ARGSUSED*/
1687 static int
1688 zone_max_lofi_test(rctl_t *r, proc_t *p, rctl_entity_p_t *e,
1689     rctl_val_t *rcntl, rctl_qty_t incr, uint_t flags)
1690 {
1691 	rctl_qty_t q;
1692 	zone_t *z;
1693 
1694 	z = e->rcep_p.zone;
1695 	ASSERT(MUTEX_HELD(&p->p_lock));
1696 	ASSERT(MUTEX_HELD(&z->zone_rctl_lock));
1697 	q = z->zone_max_lofi;
1698 	if (q + incr > rcntl->rcv_value)
1699 		return (1);
1700 	return (0);
1701 }
1702 
1703 /*ARGSUSED*/
1704 static int
1705 zone_max_lofi_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
1706     rctl_qty_t nv)
1707 {
1708 	ASSERT(MUTEX_HELD(&p->p_lock));
1709 	ASSERT(e->rcep_t == RCENTITY_ZONE);
1710 	if (e->rcep_p.zone == NULL)
1711 		return (0);
1712 	e->rcep_p.zone->zone_max_lofi_ctl = nv;
1713 	return (0);
1714 }
1715 
1716 static rctl_ops_t zone_max_lofi_ops = {
1717 	rcop_no_action,
1718 	zone_max_lofi_usage,
1719 	zone_max_lofi_set,
1720 	zone_max_lofi_test
1721 };
1722 
1723 /*
1724  * Helper function to brand the zone with a unique ID.
1725  */
1726 static void
1727 zone_uniqid(zone_t *zone)
1728 {
1729 	static uint64_t uniqid = 0;
1730 
1731 	ASSERT(MUTEX_HELD(&zonehash_lock));
1732 	zone->zone_uniqid = uniqid++;
1733 }
1734 
1735 /*
1736  * Returns a held pointer to the "kcred" for the specified zone.
1737  */
1738 struct cred *
1739 zone_get_kcred(zoneid_t zoneid)
1740 {
1741 	zone_t *zone;
1742 	cred_t *cr;
1743 
1744 	if ((zone = zone_find_by_id(zoneid)) == NULL)
1745 		return (NULL);
1746 	cr = zone->zone_kcred;
1747 	crhold(cr);
1748 	zone_rele(zone);
1749 	return (cr);
1750 }
1751 
1752 static int
1753 zone_lockedmem_kstat_update(kstat_t *ksp, int rw)
1754 {
1755 	zone_t *zone = ksp->ks_private;
1756 	zone_kstat_t *zk = ksp->ks_data;
1757 
1758 	if (rw == KSTAT_WRITE)
1759 		return (EACCES);
1760 
1761 	zk->zk_usage.value.ui64 = zone->zone_locked_mem;
1762 	zk->zk_value.value.ui64 = zone->zone_locked_mem_ctl;
1763 	return (0);
1764 }
1765 
1766 static int
1767 zone_nprocs_kstat_update(kstat_t *ksp, int rw)
1768 {
1769 	zone_t *zone = ksp->ks_private;
1770 	zone_kstat_t *zk = ksp->ks_data;
1771 
1772 	if (rw == KSTAT_WRITE)
1773 		return (EACCES);
1774 
1775 	zk->zk_usage.value.ui64 = zone->zone_nprocs;
1776 	zk->zk_value.value.ui64 = zone->zone_nprocs_ctl;
1777 	return (0);
1778 }
1779 
1780 static int
1781 zone_swapresv_kstat_update(kstat_t *ksp, int rw)
1782 {
1783 	zone_t *zone = ksp->ks_private;
1784 	zone_kstat_t *zk = ksp->ks_data;
1785 
1786 	if (rw == KSTAT_WRITE)
1787 		return (EACCES);
1788 
1789 	zk->zk_usage.value.ui64 = zone->zone_max_swap;
1790 	zk->zk_value.value.ui64 = zone->zone_max_swap_ctl;
1791 	return (0);
1792 }
1793 
1794 static kstat_t *
1795 zone_kstat_create_common(zone_t *zone, char *name,
1796     int (*updatefunc) (kstat_t *, int))
1797 {
1798 	kstat_t *ksp;
1799 	zone_kstat_t *zk;
1800 
1801 	ksp = rctl_kstat_create_zone(zone, name, KSTAT_TYPE_NAMED,
1802 	    sizeof (zone_kstat_t) / sizeof (kstat_named_t),
1803 	    KSTAT_FLAG_VIRTUAL);
1804 
1805 	if (ksp == NULL)
1806 		return (NULL);
1807 
1808 	zk = ksp->ks_data = kmem_alloc(sizeof (zone_kstat_t), KM_SLEEP);
1809 	ksp->ks_data_size += strlen(zone->zone_name) + 1;
1810 	kstat_named_init(&zk->zk_zonename, "zonename", KSTAT_DATA_STRING);
1811 	kstat_named_setstr(&zk->zk_zonename, zone->zone_name);
1812 	kstat_named_init(&zk->zk_usage, "usage", KSTAT_DATA_UINT64);
1813 	kstat_named_init(&zk->zk_value, "value", KSTAT_DATA_UINT64);
1814 	ksp->ks_update = updatefunc;
1815 	ksp->ks_private = zone;
1816 	kstat_install(ksp);
1817 	return (ksp);
1818 }
1819 
1820 static int
1821 zone_misc_kstat_update(kstat_t *ksp, int rw)
1822 {
1823 	zone_t *zone = ksp->ks_private;
1824 	zone_misc_kstat_t *zmp = ksp->ks_data;
1825 	hrtime_t tmp;
1826 
1827 	if (rw == KSTAT_WRITE)
1828 		return (EACCES);
1829 
1830 	tmp = zone->zone_utime;
1831 	scalehrtime(&tmp);
1832 	zmp->zm_utime.value.ui64 = tmp;
1833 	tmp = zone->zone_stime;
1834 	scalehrtime(&tmp);
1835 	zmp->zm_stime.value.ui64 = tmp;
1836 	tmp = zone->zone_wtime;
1837 	scalehrtime(&tmp);
1838 	zmp->zm_wtime.value.ui64 = tmp;
1839 
1840 	zmp->zm_avenrun1.value.ui32 = zone->zone_avenrun[0];
1841 	zmp->zm_avenrun5.value.ui32 = zone->zone_avenrun[1];
1842 	zmp->zm_avenrun15.value.ui32 = zone->zone_avenrun[2];
1843 
1844 	zmp->zm_ffcap.value.ui32 = zone->zone_ffcap;
1845 	zmp->zm_ffnoproc.value.ui32 = zone->zone_ffnoproc;
1846 	zmp->zm_ffnomem.value.ui32 = zone->zone_ffnomem;
1847 	zmp->zm_ffmisc.value.ui32 = zone->zone_ffmisc;
1848 
1849 	return (0);
1850 }
1851 
1852 static kstat_t *
1853 zone_misc_kstat_create(zone_t *zone)
1854 {
1855 	kstat_t *ksp;
1856 	zone_misc_kstat_t *zmp;
1857 
1858 	if ((ksp = kstat_create_zone("zones", zone->zone_id,
1859 	    zone->zone_name, "zone_misc", KSTAT_TYPE_NAMED,
1860 	    sizeof (zone_misc_kstat_t) / sizeof (kstat_named_t),
1861 	    KSTAT_FLAG_VIRTUAL, zone->zone_id)) == NULL)
1862 		return (NULL);
1863 
1864 	if (zone->zone_id != GLOBAL_ZONEID)
1865 		kstat_zone_add(ksp, GLOBAL_ZONEID);
1866 
1867 	zmp = ksp->ks_data = kmem_zalloc(sizeof (zone_misc_kstat_t), KM_SLEEP);
1868 	ksp->ks_data_size += strlen(zone->zone_name) + 1;
1869 	ksp->ks_lock = &zone->zone_misc_lock;
1870 	zone->zone_misc_stats = zmp;
1871 
1872 	/* The kstat "name" field is not large enough for a full zonename */
1873 	kstat_named_init(&zmp->zm_zonename, "zonename", KSTAT_DATA_STRING);
1874 	kstat_named_setstr(&zmp->zm_zonename, zone->zone_name);
1875 	kstat_named_init(&zmp->zm_utime, "nsec_user", KSTAT_DATA_UINT64);
1876 	kstat_named_init(&zmp->zm_stime, "nsec_sys", KSTAT_DATA_UINT64);
1877 	kstat_named_init(&zmp->zm_wtime, "nsec_waitrq", KSTAT_DATA_UINT64);
1878 	kstat_named_init(&zmp->zm_avenrun1, "avenrun_1min", KSTAT_DATA_UINT32);
1879 	kstat_named_init(&zmp->zm_avenrun5, "avenrun_5min", KSTAT_DATA_UINT32);
1880 	kstat_named_init(&zmp->zm_avenrun15, "avenrun_15min",
1881 	    KSTAT_DATA_UINT32);
1882 	kstat_named_init(&zmp->zm_ffcap, "forkfail_cap", KSTAT_DATA_UINT32);
1883 	kstat_named_init(&zmp->zm_ffnoproc, "forkfail_noproc",
1884 	    KSTAT_DATA_UINT32);
1885 	kstat_named_init(&zmp->zm_ffnomem, "forkfail_nomem", KSTAT_DATA_UINT32);
1886 	kstat_named_init(&zmp->zm_ffmisc, "forkfail_misc", KSTAT_DATA_UINT32);
1887 
1888 
1889 	ksp->ks_update = zone_misc_kstat_update;
1890 	ksp->ks_private = zone;
1891 
1892 	kstat_install(ksp);
1893 	return (ksp);
1894 }
1895 
1896 static void
1897 zone_kstat_create(zone_t *zone)
1898 {
1899 	zone->zone_lockedmem_kstat = zone_kstat_create_common(zone,
1900 	    "lockedmem", zone_lockedmem_kstat_update);
1901 	zone->zone_swapresv_kstat = zone_kstat_create_common(zone,
1902 	    "swapresv", zone_swapresv_kstat_update);
1903 	zone->zone_nprocs_kstat = zone_kstat_create_common(zone,
1904 	    "nprocs", zone_nprocs_kstat_update);
1905 
1906 	if ((zone->zone_misc_ksp = zone_misc_kstat_create(zone)) == NULL) {
1907 		zone->zone_misc_stats = kmem_zalloc(
1908 		    sizeof (zone_misc_kstat_t), KM_SLEEP);
1909 	}
1910 }
1911 
1912 static void
1913 zone_kstat_delete_common(kstat_t **pkstat, size_t datasz)
1914 {
1915 	void *data;
1916 
1917 	if (*pkstat != NULL) {
1918 		data = (*pkstat)->ks_data;
1919 		kstat_delete(*pkstat);
1920 		kmem_free(data, datasz);
1921 		*pkstat = NULL;
1922 	}
1923 }
1924 
1925 static void
1926 zone_kstat_delete(zone_t *zone)
1927 {
1928 	zone_kstat_delete_common(&zone->zone_lockedmem_kstat,
1929 	    sizeof (zone_kstat_t));
1930 	zone_kstat_delete_common(&zone->zone_swapresv_kstat,
1931 	    sizeof (zone_kstat_t));
1932 	zone_kstat_delete_common(&zone->zone_nprocs_kstat,
1933 	    sizeof (zone_kstat_t));
1934 	zone_kstat_delete_common(&zone->zone_misc_ksp,
1935 	    sizeof (zone_misc_kstat_t));
1936 }
1937 
1938 /*
1939  * Called very early on in boot to initialize the ZSD list so that
1940  * zone_key_create() can be called before zone_init().  It also initializes
1941  * portions of zone0 which may be used before zone_init() is called.  The
1942  * variable "global_zone" will be set when zone0 is fully initialized by
1943  * zone_init().
1944  */
1945 void
1946 zone_zsd_init(void)
1947 {
1948 	mutex_init(&zonehash_lock, NULL, MUTEX_DEFAULT, NULL);
1949 	mutex_init(&zsd_key_lock, NULL, MUTEX_DEFAULT, NULL);
1950 	list_create(&zsd_registered_keys, sizeof (struct zsd_entry),
1951 	    offsetof(struct zsd_entry, zsd_linkage));
1952 	list_create(&zone_active, sizeof (zone_t),
1953 	    offsetof(zone_t, zone_linkage));
1954 	list_create(&zone_deathrow, sizeof (zone_t),
1955 	    offsetof(zone_t, zone_linkage));
1956 
1957 	mutex_init(&zone0.zone_lock, NULL, MUTEX_DEFAULT, NULL);
1958 	mutex_init(&zone0.zone_nlwps_lock, NULL, MUTEX_DEFAULT, NULL);
1959 	mutex_init(&zone0.zone_mem_lock, NULL, MUTEX_DEFAULT, NULL);
1960 	zone0.zone_shares = 1;
1961 	zone0.zone_nlwps = 0;
1962 	zone0.zone_nlwps_ctl = INT_MAX;
1963 	zone0.zone_nprocs = 0;
1964 	zone0.zone_nprocs_ctl = INT_MAX;
1965 	zone0.zone_locked_mem = 0;
1966 	zone0.zone_locked_mem_ctl = UINT64_MAX;
1967 	ASSERT(zone0.zone_max_swap == 0);
1968 	zone0.zone_max_swap_ctl = UINT64_MAX;
1969 	zone0.zone_max_lofi = 0;
1970 	zone0.zone_max_lofi_ctl = UINT64_MAX;
1971 	zone0.zone_shmmax = 0;
1972 	zone0.zone_ipc.ipcq_shmmni = 0;
1973 	zone0.zone_ipc.ipcq_semmni = 0;
1974 	zone0.zone_ipc.ipcq_msgmni = 0;
1975 	zone0.zone_name = GLOBAL_ZONENAME;
1976 	zone0.zone_nodename = utsname.nodename;
1977 	zone0.zone_domain = srpc_domain;
1978 	zone0.zone_hostid = HW_INVALID_HOSTID;
1979 	zone0.zone_fs_allowed = NULL;
1980 	zone0.zone_ref = 1;
1981 	zone0.zone_id = GLOBAL_ZONEID;
1982 	zone0.zone_status = ZONE_IS_RUNNING;
1983 	zone0.zone_rootpath = "/";
1984 	zone0.zone_rootpathlen = 2;
1985 	zone0.zone_psetid = ZONE_PS_INVAL;
1986 	zone0.zone_ncpus = 0;
1987 	zone0.zone_ncpus_online = 0;
1988 	zone0.zone_proc_initpid = 1;
1989 	zone0.zone_initname = initname;
1990 	zone0.zone_lockedmem_kstat = NULL;
1991 	zone0.zone_swapresv_kstat = NULL;
1992 	zone0.zone_nprocs_kstat = NULL;
1993 
1994 	zone0.zone_stime = 0;
1995 	zone0.zone_utime = 0;
1996 	zone0.zone_wtime = 0;
1997 
1998 	list_create(&zone0.zone_ref_list, sizeof (zone_ref_t),
1999 	    offsetof(zone_ref_t, zref_linkage));
2000 	list_create(&zone0.zone_zsd, sizeof (struct zsd_entry),
2001 	    offsetof(struct zsd_entry, zsd_linkage));
2002 	list_insert_head(&zone_active, &zone0);
2003 
2004 	/*
2005 	 * The root filesystem is not mounted yet, so zone_rootvp cannot be set
2006 	 * to anything meaningful.  It is assigned to be 'rootdir' in
2007 	 * vfs_mountroot().
2008 	 */
2009 	zone0.zone_rootvp = NULL;
2010 	zone0.zone_vfslist = NULL;
2011 	zone0.zone_bootargs = initargs;
2012 	zone0.zone_privset = kmem_alloc(sizeof (priv_set_t), KM_SLEEP);
2013 	/*
2014 	 * The global zone has all privileges
2015 	 */
2016 	priv_fillset(zone0.zone_privset);
2017 	/*
2018 	 * Add p0 to the global zone
2019 	 */
2020 	zone0.zone_zsched = &p0;
2021 	p0.p_zone = &zone0;
2022 }
2023 
2024 /*
2025  * Compute a hash value based on the contents of the label and the DOI.  The
2026  * hash algorithm is somewhat arbitrary, but is based on the observation that
2027  * humans will likely pick labels that differ by amounts that work out to be
2028  * multiples of the number of hash chains, and thus stirring in some primes
2029  * should help.
2030  */
2031 static uint_t
2032 hash_bylabel(void *hdata, mod_hash_key_t key)
2033 {
2034 	const ts_label_t *lab = (ts_label_t *)key;
2035 	const uint32_t *up, *ue;
2036 	uint_t hash;
2037 	int i;
2038 
2039 	_NOTE(ARGUNUSED(hdata));
2040 
2041 	hash = lab->tsl_doi + (lab->tsl_doi << 1);
2042 	/* we depend on alignment of label, but not representation */
2043 	up = (const uint32_t *)&lab->tsl_label;
2044 	ue = up + sizeof (lab->tsl_label) / sizeof (*up);
2045 	i = 1;
2046 	while (up < ue) {
2047 		/* using 2^n + 1, 1 <= n <= 16 as source of many primes */
2048 		hash += *up + (*up << ((i % 16) + 1));
2049 		up++;
2050 		i++;
2051 	}
2052 	return (hash);
2053 }
2054 
2055 /*
2056  * All that mod_hash cares about here is zero (equal) versus non-zero (not
2057  * equal).  This may need to be changed if less than / greater than is ever
2058  * needed.
2059  */
2060 static int
2061 hash_labelkey_cmp(mod_hash_key_t key1, mod_hash_key_t key2)
2062 {
2063 	ts_label_t *lab1 = (ts_label_t *)key1;
2064 	ts_label_t *lab2 = (ts_label_t *)key2;
2065 
2066 	return (label_equal(lab1, lab2) ? 0 : 1);
2067 }
2068 
2069 /*
2070  * Called by main() to initialize the zones framework.
2071  */
2072 void
2073 zone_init(void)
2074 {
2075 	rctl_dict_entry_t *rde;
2076 	rctl_val_t *dval;
2077 	rctl_set_t *set;
2078 	rctl_alloc_gp_t *gp;
2079 	rctl_entity_p_t e;
2080 	int res;
2081 
2082 	ASSERT(curproc == &p0);
2083 
2084 	/*
2085 	 * Create ID space for zone IDs.  ID 0 is reserved for the
2086 	 * global zone.
2087 	 */
2088 	zoneid_space = id_space_create("zoneid_space", 1, MAX_ZONEID);
2089 
2090 	/*
2091 	 * Initialize generic zone resource controls, if any.
2092 	 */
2093 	rc_zone_cpu_shares = rctl_register("zone.cpu-shares",
2094 	    RCENTITY_ZONE, RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_DENY_NEVER |
2095 	    RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_COUNT | RCTL_GLOBAL_SYSLOG_NEVER,
2096 	    FSS_MAXSHARES, FSS_MAXSHARES, &zone_cpu_shares_ops);
2097 
2098 	rc_zone_cpu_cap = rctl_register("zone.cpu-cap",
2099 	    RCENTITY_ZONE, RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_DENY_ALWAYS |
2100 	    RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_COUNT |RCTL_GLOBAL_SYSLOG_NEVER |
2101 	    RCTL_GLOBAL_INFINITE,
2102 	    MAXCAP, MAXCAP, &zone_cpu_cap_ops);
2103 
2104 	rc_zone_nlwps = rctl_register("zone.max-lwps", RCENTITY_ZONE,
2105 	    RCTL_GLOBAL_NOACTION | RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_COUNT,
2106 	    INT_MAX, INT_MAX, &zone_lwps_ops);
2107 
2108 	rc_zone_nprocs = rctl_register("zone.max-processes", RCENTITY_ZONE,
2109 	    RCTL_GLOBAL_NOACTION | RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_COUNT,
2110 	    INT_MAX, INT_MAX, &zone_procs_ops);
2111 
2112 	/*
2113 	 * System V IPC resource controls
2114 	 */
2115 	rc_zone_msgmni = rctl_register("zone.max-msg-ids",
2116 	    RCENTITY_ZONE, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_NOBASIC |
2117 	    RCTL_GLOBAL_COUNT, IPC_IDS_MAX, IPC_IDS_MAX, &zone_msgmni_ops);
2118 
2119 	rc_zone_semmni = rctl_register("zone.max-sem-ids",
2120 	    RCENTITY_ZONE, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_NOBASIC |
2121 	    RCTL_GLOBAL_COUNT, IPC_IDS_MAX, IPC_IDS_MAX, &zone_semmni_ops);
2122 
2123 	rc_zone_shmmni = rctl_register("zone.max-shm-ids",
2124 	    RCENTITY_ZONE, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_NOBASIC |
2125 	    RCTL_GLOBAL_COUNT, IPC_IDS_MAX, IPC_IDS_MAX, &zone_shmmni_ops);
2126 
2127 	rc_zone_shmmax = rctl_register("zone.max-shm-memory",
2128 	    RCENTITY_ZONE, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_NOBASIC |
2129 	    RCTL_GLOBAL_BYTES, UINT64_MAX, UINT64_MAX, &zone_shmmax_ops);
2130 
2131 	/*
2132 	 * Create a rctl_val with PRIVILEGED, NOACTION, value = 1.  Then attach
2133 	 * this at the head of the rctl_dict_entry for ``zone.cpu-shares''.
2134 	 */
2135 	dval = kmem_cache_alloc(rctl_val_cache, KM_SLEEP);
2136 	bzero(dval, sizeof (rctl_val_t));
2137 	dval->rcv_value = 1;
2138 	dval->rcv_privilege = RCPRIV_PRIVILEGED;
2139 	dval->rcv_flagaction = RCTL_LOCAL_NOACTION;
2140 	dval->rcv_action_recip_pid = -1;
2141 
2142 	rde = rctl_dict_lookup("zone.cpu-shares");
2143 	(void) rctl_val_list_insert(&rde->rcd_default_value, dval);
2144 
2145 	rc_zone_locked_mem = rctl_register("zone.max-locked-memory",
2146 	    RCENTITY_ZONE, RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_BYTES |
2147 	    RCTL_GLOBAL_DENY_ALWAYS, UINT64_MAX, UINT64_MAX,
2148 	    &zone_locked_mem_ops);
2149 
2150 	rc_zone_max_swap = rctl_register("zone.max-swap",
2151 	    RCENTITY_ZONE, RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_BYTES |
2152 	    RCTL_GLOBAL_DENY_ALWAYS, UINT64_MAX, UINT64_MAX,
2153 	    &zone_max_swap_ops);
2154 
2155 	rc_zone_max_lofi = rctl_register("zone.max-lofi",
2156 	    RCENTITY_ZONE, RCTL_GLOBAL_NOBASIC | RCTL_GLOBAL_COUNT |
2157 	    RCTL_GLOBAL_DENY_ALWAYS, UINT64_MAX, UINT64_MAX,
2158 	    &zone_max_lofi_ops);
2159 
2160 	/*
2161 	 * Initialize the ``global zone''.
2162 	 */
2163 	set = rctl_set_create();
2164 	gp = rctl_set_init_prealloc(RCENTITY_ZONE);
2165 	mutex_enter(&p0.p_lock);
2166 	e.rcep_p.zone = &zone0;
2167 	e.rcep_t = RCENTITY_ZONE;
2168 	zone0.zone_rctls = rctl_set_init(RCENTITY_ZONE, &p0, &e, set,
2169 	    gp);
2170 
2171 	zone0.zone_nlwps = p0.p_lwpcnt;
2172 	zone0.zone_nprocs = 1;
2173 	zone0.zone_ntasks = 1;
2174 	mutex_exit(&p0.p_lock);
2175 	zone0.zone_restart_init = B_TRUE;
2176 	zone0.zone_brand = &native_brand;
2177 	rctl_prealloc_destroy(gp);
2178 	/*
2179 	 * pool_default hasn't been initialized yet, so we let pool_init()
2180 	 * take care of making sure the global zone is in the default pool.
2181 	 */
2182 
2183 	/*
2184 	 * Initialize global zone kstats
2185 	 */
2186 	zone_kstat_create(&zone0);
2187 
2188 	/*
2189 	 * Initialize zone label.
2190 	 * mlp are initialized when tnzonecfg is loaded.
2191 	 */
2192 	zone0.zone_slabel = l_admin_low;
2193 	rw_init(&zone0.zone_mlps.mlpl_rwlock, NULL, RW_DEFAULT, NULL);
2194 	label_hold(l_admin_low);
2195 
2196 	/*
2197 	 * Initialise the lock for the database structure used by mntfs.
2198 	 */
2199 	rw_init(&zone0.zone_mntfs_db_lock, NULL, RW_DEFAULT, NULL);
2200 
2201 	mutex_enter(&zonehash_lock);
2202 	zone_uniqid(&zone0);
2203 	ASSERT(zone0.zone_uniqid == GLOBAL_ZONEUNIQID);
2204 
2205 	zonehashbyid = mod_hash_create_idhash("zone_by_id", zone_hash_size,
2206 	    mod_hash_null_valdtor);
2207 	zonehashbyname = mod_hash_create_strhash("zone_by_name",
2208 	    zone_hash_size, mod_hash_null_valdtor);
2209 	/*
2210 	 * maintain zonehashbylabel only for labeled systems
2211 	 */
2212 	if (is_system_labeled())
2213 		zonehashbylabel = mod_hash_create_extended("zone_by_label",
2214 		    zone_hash_size, mod_hash_null_keydtor,
2215 		    mod_hash_null_valdtor, hash_bylabel, NULL,
2216 		    hash_labelkey_cmp, KM_SLEEP);
2217 	zonecount = 1;
2218 
2219 	(void) mod_hash_insert(zonehashbyid, (mod_hash_key_t)GLOBAL_ZONEID,
2220 	    (mod_hash_val_t)&zone0);
2221 	(void) mod_hash_insert(zonehashbyname, (mod_hash_key_t)zone0.zone_name,
2222 	    (mod_hash_val_t)&zone0);
2223 	if (is_system_labeled()) {
2224 		zone0.zone_flags |= ZF_HASHED_LABEL;
2225 		(void) mod_hash_insert(zonehashbylabel,
2226 		    (mod_hash_key_t)zone0.zone_slabel, (mod_hash_val_t)&zone0);
2227 	}
2228 	mutex_exit(&zonehash_lock);
2229 
2230 	/*
2231 	 * We avoid setting zone_kcred until now, since kcred is initialized
2232 	 * sometime after zone_zsd_init() and before zone_init().
2233 	 */
2234 	zone0.zone_kcred = kcred;
2235 	/*
2236 	 * The global zone is fully initialized (except for zone_rootvp which
2237 	 * will be set when the root filesystem is mounted).
2238 	 */
2239 	global_zone = &zone0;
2240 
2241 	/*
2242 	 * Setup an event channel to send zone status change notifications on
2243 	 */
2244 	res = sysevent_evc_bind(ZONE_EVENT_CHANNEL, &zone_event_chan,
2245 	    EVCH_CREAT);
2246 
2247 	if (res)
2248 		panic("Sysevent_evc_bind failed during zone setup.\n");
2249 
2250 }
2251 
2252 static void
2253 zone_free(zone_t *zone)
2254 {
2255 	ASSERT(zone != global_zone);
2256 	ASSERT(zone->zone_ntasks == 0);
2257 	ASSERT(zone->zone_nlwps == 0);
2258 	ASSERT(zone->zone_nprocs == 0);
2259 	ASSERT(zone->zone_cred_ref == 0);
2260 	ASSERT(zone->zone_kcred == NULL);
2261 	ASSERT(zone_status_get(zone) == ZONE_IS_DEAD ||
2262 	    zone_status_get(zone) == ZONE_IS_UNINITIALIZED);
2263 	ASSERT(list_is_empty(&zone->zone_ref_list));
2264 
2265 	/*
2266 	 * Remove any zone caps.
2267 	 */
2268 	cpucaps_zone_remove(zone);
2269 
2270 	ASSERT(zone->zone_cpucap == NULL);
2271 
2272 	/* remove from deathrow list */
2273 	if (zone_status_get(zone) == ZONE_IS_DEAD) {
2274 		ASSERT(zone->zone_ref == 0);
2275 		mutex_enter(&zone_deathrow_lock);
2276 		list_remove(&zone_deathrow, zone);
2277 		mutex_exit(&zone_deathrow_lock);
2278 	}
2279 
2280 	list_destroy(&zone->zone_ref_list);
2281 	zone_free_zsd(zone);
2282 	zone_free_datasets(zone);
2283 	list_destroy(&zone->zone_dl_list);
2284 
2285 	if (zone->zone_rootvp != NULL)
2286 		VN_RELE(zone->zone_rootvp);
2287 	if (zone->zone_rootpath)
2288 		kmem_free(zone->zone_rootpath, zone->zone_rootpathlen);
2289 	if (zone->zone_name != NULL)
2290 		kmem_free(zone->zone_name, ZONENAME_MAX);
2291 	if (zone->zone_slabel != NULL)
2292 		label_rele(zone->zone_slabel);
2293 	if (zone->zone_nodename != NULL)
2294 		kmem_free(zone->zone_nodename, _SYS_NMLN);
2295 	if (zone->zone_domain != NULL)
2296 		kmem_free(zone->zone_domain, _SYS_NMLN);
2297 	if (zone->zone_privset != NULL)
2298 		kmem_free(zone->zone_privset, sizeof (priv_set_t));
2299 	if (zone->zone_rctls != NULL)
2300 		rctl_set_free(zone->zone_rctls);
2301 	if (zone->zone_bootargs != NULL)
2302 		strfree(zone->zone_bootargs);
2303 	if (zone->zone_initname != NULL)
2304 		strfree(zone->zone_initname);
2305 	if (zone->zone_fs_allowed != NULL)
2306 		strfree(zone->zone_fs_allowed);
2307 	if (zone->zone_pfexecd != NULL)
2308 		klpd_freelist(&zone->zone_pfexecd);
2309 	id_free(zoneid_space, zone->zone_id);
2310 	mutex_destroy(&zone->zone_lock);
2311 	cv_destroy(&zone->zone_cv);
2312 	rw_destroy(&zone->zone_mlps.mlpl_rwlock);
2313 	rw_destroy(&zone->zone_mntfs_db_lock);
2314 	kmem_free(zone, sizeof (zone_t));
2315 }
2316 
2317 /*
2318  * See block comment at the top of this file for information about zone
2319  * status values.
2320  */
2321 /*
2322  * Convenience function for setting zone status.
2323  */
2324 static void
2325 zone_status_set(zone_t *zone, zone_status_t status)
2326 {
2327 
2328 	nvlist_t *nvl = NULL;
2329 	ASSERT(MUTEX_HELD(&zone_status_lock));
2330 	ASSERT(status > ZONE_MIN_STATE && status <= ZONE_MAX_STATE &&
2331 	    status >= zone_status_get(zone));
2332 
2333 	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) ||
2334 	    nvlist_add_string(nvl, ZONE_CB_NAME, zone->zone_name) ||
2335 	    nvlist_add_string(nvl, ZONE_CB_NEWSTATE,
2336 	    zone_status_table[status]) ||
2337 	    nvlist_add_string(nvl, ZONE_CB_OLDSTATE,
2338 	    zone_status_table[zone->zone_status]) ||
2339 	    nvlist_add_int32(nvl, ZONE_CB_ZONEID, zone->zone_id) ||
2340 	    nvlist_add_uint64(nvl, ZONE_CB_TIMESTAMP, (uint64_t)gethrtime()) ||
2341 	    sysevent_evc_publish(zone_event_chan, ZONE_EVENT_STATUS_CLASS,
2342 	    ZONE_EVENT_STATUS_SUBCLASS, "sun.com", "kernel", nvl, EVCH_SLEEP)) {
2343 #ifdef DEBUG
2344 		(void) printf(
2345 		    "Failed to allocate and send zone state change event.\n");
2346 #endif
2347 	}
2348 	nvlist_free(nvl);
2349 
2350 	zone->zone_status = status;
2351 
2352 	cv_broadcast(&zone->zone_cv);
2353 }
2354 
2355 /*
2356  * Public function to retrieve the zone status.  The zone status may
2357  * change after it is retrieved.
2358  */
2359 zone_status_t
2360 zone_status_get(zone_t *zone)
2361 {
2362 	return (zone->zone_status);
2363 }
2364 
2365 static int
2366 zone_set_bootargs(zone_t *zone, const char *zone_bootargs)
2367 {
2368 	char *buf = kmem_zalloc(BOOTARGS_MAX, KM_SLEEP);
2369 	int err = 0;
2370 
2371 	ASSERT(zone != global_zone);
2372 	if ((err = copyinstr(zone_bootargs, buf, BOOTARGS_MAX, NULL)) != 0)
2373 		goto done;	/* EFAULT or ENAMETOOLONG */
2374 
2375 	if (zone->zone_bootargs != NULL)
2376 		strfree(zone->zone_bootargs);
2377 
2378 	zone->zone_bootargs = strdup(buf);
2379 
2380 done:
2381 	kmem_free(buf, BOOTARGS_MAX);
2382 	return (err);
2383 }
2384 
2385 static int
2386 zone_set_brand(zone_t *zone, const char *brand)
2387 {
2388 	struct brand_attr *attrp;
2389 	brand_t *bp;
2390 
2391 	attrp = kmem_alloc(sizeof (struct brand_attr), KM_SLEEP);
2392 	if (copyin(brand, attrp, sizeof (struct brand_attr)) != 0) {
2393 		kmem_free(attrp, sizeof (struct brand_attr));
2394 		return (EFAULT);
2395 	}
2396 
2397 	bp = brand_register_zone(attrp);
2398 	kmem_free(attrp, sizeof (struct brand_attr));
2399 	if (bp == NULL)
2400 		return (EINVAL);
2401 
2402 	/*
2403 	 * This is the only place where a zone can change it's brand.
2404 	 * We already need to hold zone_status_lock to check the zone
2405 	 * status, so we'll just use that lock to serialize zone
2406 	 * branding requests as well.
2407 	 */
2408 	mutex_enter(&zone_status_lock);
2409 
2410 	/* Re-Branding is not allowed and the zone can't be booted yet */
2411 	if ((ZONE_IS_BRANDED(zone)) ||
2412 	    (zone_status_get(zone) >= ZONE_IS_BOOTING)) {
2413 		mutex_exit(&zone_status_lock);
2414 		brand_unregister_zone(bp);
2415 		return (EINVAL);
2416 	}
2417 
2418 	/* set up the brand specific data */
2419 	zone->zone_brand = bp;
2420 	ZBROP(zone)->b_init_brand_data(zone);
2421 
2422 	mutex_exit(&zone_status_lock);
2423 	return (0);
2424 }
2425 
2426 static int
2427 zone_set_fs_allowed(zone_t *zone, const char *zone_fs_allowed)
2428 {
2429 	char *buf = kmem_zalloc(ZONE_FS_ALLOWED_MAX, KM_SLEEP);
2430 	int err = 0;
2431 
2432 	ASSERT(zone != global_zone);
2433 	if ((err = copyinstr(zone_fs_allowed, buf,
2434 	    ZONE_FS_ALLOWED_MAX, NULL)) != 0)
2435 		goto done;
2436 
2437 	if (zone->zone_fs_allowed != NULL)
2438 		strfree(zone->zone_fs_allowed);
2439 
2440 	zone->zone_fs_allowed = strdup(buf);
2441 
2442 done:
2443 	kmem_free(buf, ZONE_FS_ALLOWED_MAX);
2444 	return (err);
2445 }
2446 
2447 static int
2448 zone_set_initname(zone_t *zone, const char *zone_initname)
2449 {
2450 	char initname[INITNAME_SZ];
2451 	size_t len;
2452 	int err = 0;
2453 
2454 	ASSERT(zone != global_zone);
2455 	if ((err = copyinstr(zone_initname, initname, INITNAME_SZ, &len)) != 0)
2456 		return (err);	/* EFAULT or ENAMETOOLONG */
2457 
2458 	if (zone->zone_initname != NULL)
2459 		strfree(zone->zone_initname);
2460 
2461 	zone->zone_initname = kmem_alloc(strlen(initname) + 1, KM_SLEEP);
2462 	(void) strcpy(zone->zone_initname, initname);
2463 	return (0);
2464 }
2465 
2466 static int
2467 zone_set_phys_mcap(zone_t *zone, const uint64_t *zone_mcap)
2468 {
2469 	uint64_t mcap;
2470 	int err = 0;
2471 
2472 	if ((err = copyin(zone_mcap, &mcap, sizeof (uint64_t))) == 0)
2473 		zone->zone_phys_mcap = mcap;
2474 
2475 	return (err);
2476 }
2477 
2478 static int
2479 zone_set_sched_class(zone_t *zone, const char *new_class)
2480 {
2481 	char sched_class[PC_CLNMSZ];
2482 	id_t classid;
2483 	int err;
2484 
2485 	ASSERT(zone != global_zone);
2486 	if ((err = copyinstr(new_class, sched_class, PC_CLNMSZ, NULL)) != 0)
2487 		return (err);	/* EFAULT or ENAMETOOLONG */
2488 
2489 	if (getcid(sched_class, &classid) != 0 || CLASS_KERNEL(classid))
2490 		return (set_errno(EINVAL));
2491 	zone->zone_defaultcid = classid;
2492 	ASSERT(zone->zone_defaultcid > 0 &&
2493 	    zone->zone_defaultcid < loaded_classes);
2494 
2495 	return (0);
2496 }
2497 
2498 /*
2499  * Block indefinitely waiting for (zone_status >= status)
2500  */
2501 void
2502 zone_status_wait(zone_t *zone, zone_status_t status)
2503 {
2504 	ASSERT(status > ZONE_MIN_STATE && status <= ZONE_MAX_STATE);
2505 
2506 	mutex_enter(&zone_status_lock);
2507 	while (zone->zone_status < status) {
2508 		cv_wait(&zone->zone_cv, &zone_status_lock);
2509 	}
2510 	mutex_exit(&zone_status_lock);
2511 }
2512 
2513 /*
2514  * Private CPR-safe version of zone_status_wait().
2515  */
2516 static void
2517 zone_status_wait_cpr(zone_t *zone, zone_status_t status, char *str)
2518 {
2519 	callb_cpr_t cprinfo;
2520 
2521 	ASSERT(status > ZONE_MIN_STATE && status <= ZONE_MAX_STATE);
2522 
2523 	CALLB_CPR_INIT(&cprinfo, &zone_status_lock, callb_generic_cpr,
2524 	    str);
2525 	mutex_enter(&zone_status_lock);
2526 	while (zone->zone_status < status) {
2527 		CALLB_CPR_SAFE_BEGIN(&cprinfo);
2528 		cv_wait(&zone->zone_cv, &zone_status_lock);
2529 		CALLB_CPR_SAFE_END(&cprinfo, &zone_status_lock);
2530 	}
2531 	/*
2532 	 * zone_status_lock is implicitly released by the following.
2533 	 */
2534 	CALLB_CPR_EXIT(&cprinfo);
2535 }
2536 
2537 /*
2538  * Block until zone enters requested state or signal is received.  Return (0)
2539  * if signaled, non-zero otherwise.
2540  */
2541 int
2542 zone_status_wait_sig(zone_t *zone, zone_status_t status)
2543 {
2544 	ASSERT(status > ZONE_MIN_STATE && status <= ZONE_MAX_STATE);
2545 
2546 	mutex_enter(&zone_status_lock);
2547 	while (zone->zone_status < status) {
2548 		if (!cv_wait_sig(&zone->zone_cv, &zone_status_lock)) {
2549 			mutex_exit(&zone_status_lock);
2550 			return (0);
2551 		}
2552 	}
2553 	mutex_exit(&zone_status_lock);
2554 	return (1);
2555 }
2556 
2557 /*
2558  * Block until the zone enters the requested state or the timeout expires,
2559  * whichever happens first.  Return (-1) if operation timed out, time remaining
2560  * otherwise.
2561  */
2562 clock_t
2563 zone_status_timedwait(zone_t *zone, clock_t tim, zone_status_t status)
2564 {
2565 	clock_t timeleft = 0;
2566 
2567 	ASSERT(status > ZONE_MIN_STATE && status <= ZONE_MAX_STATE);
2568 
2569 	mutex_enter(&zone_status_lock);
2570 	while (zone->zone_status < status && timeleft != -1) {
2571 		timeleft = cv_timedwait(&zone->zone_cv, &zone_status_lock, tim);
2572 	}
2573 	mutex_exit(&zone_status_lock);
2574 	return (timeleft);
2575 }
2576 
2577 /*
2578  * Block until the zone enters the requested state, the current process is
2579  * signaled,  or the timeout expires, whichever happens first.  Return (-1) if
2580  * operation timed out, 0 if signaled, time remaining otherwise.
2581  */
2582 clock_t
2583 zone_status_timedwait_sig(zone_t *zone, clock_t tim, zone_status_t status)
2584 {
2585 	clock_t timeleft = tim - ddi_get_lbolt();
2586 
2587 	ASSERT(status > ZONE_MIN_STATE && status <= ZONE_MAX_STATE);
2588 
2589 	mutex_enter(&zone_status_lock);
2590 	while (zone->zone_status < status) {
2591 		timeleft = cv_timedwait_sig(&zone->zone_cv, &zone_status_lock,
2592 		    tim);
2593 		if (timeleft <= 0)
2594 			break;
2595 	}
2596 	mutex_exit(&zone_status_lock);
2597 	return (timeleft);
2598 }
2599 
2600 /*
2601  * Zones have two reference counts: one for references from credential
2602  * structures (zone_cred_ref), and one (zone_ref) for everything else.
2603  * This is so we can allow a zone to be rebooted while there are still
2604  * outstanding cred references, since certain drivers cache dblks (which
2605  * implicitly results in cached creds).  We wait for zone_ref to drop to
2606  * 0 (actually 1), but not zone_cred_ref.  The zone structure itself is
2607  * later freed when the zone_cred_ref drops to 0, though nothing other
2608  * than the zone id and privilege set should be accessed once the zone
2609  * is "dead".
2610  *
2611  * A debugging flag, zone_wait_for_cred, can be set to a non-zero value
2612  * to force halt/reboot to block waiting for the zone_cred_ref to drop
2613  * to 0.  This can be useful to flush out other sources of cached creds
2614  * that may be less innocuous than the driver case.
2615  *
2616  * Zones also provide a tracked reference counting mechanism in which zone
2617  * references are represented by "crumbs" (zone_ref structures).  Crumbs help
2618  * debuggers determine the sources of leaked zone references.  See
2619  * zone_hold_ref() and zone_rele_ref() below for more information.
2620  */
2621 
2622 int zone_wait_for_cred = 0;
2623 
2624 static void
2625 zone_hold_locked(zone_t *z)
2626 {
2627 	ASSERT(MUTEX_HELD(&z->zone_lock));
2628 	z->zone_ref++;
2629 	ASSERT(z->zone_ref != 0);
2630 }
2631 
2632 /*
2633  * Increment the specified zone's reference count.  The zone's zone_t structure
2634  * will not be freed as long as the zone's reference count is nonzero.
2635  * Decrement the zone's reference count via zone_rele().
2636  *
2637  * NOTE: This function should only be used to hold zones for short periods of
2638  * time.  Use zone_hold_ref() if the zone must be held for a long time.
2639  */
2640 void
2641 zone_hold(zone_t *z)
2642 {
2643 	mutex_enter(&z->zone_lock);
2644 	zone_hold_locked(z);
2645 	mutex_exit(&z->zone_lock);
2646 }
2647 
2648 /*
2649  * If the non-cred ref count drops to 1 and either the cred ref count
2650  * is 0 or we aren't waiting for cred references, the zone is ready to
2651  * be destroyed.
2652  */
2653 #define	ZONE_IS_UNREF(zone)	((zone)->zone_ref == 1 && \
2654 	    (!zone_wait_for_cred || (zone)->zone_cred_ref == 0))
2655 
2656 /*
2657  * Common zone reference release function invoked by zone_rele() and
2658  * zone_rele_ref().  If subsys is ZONE_REF_NUM_SUBSYS, then the specified
2659  * zone's subsystem-specific reference counters are not affected by the
2660  * release.  If ref is not NULL, then the zone_ref_t to which it refers is
2661  * removed from the specified zone's reference list.  ref must be non-NULL iff
2662  * subsys is not ZONE_REF_NUM_SUBSYS.
2663  */
2664 static void
2665 zone_rele_common(zone_t *z, zone_ref_t *ref, zone_ref_subsys_t subsys)
2666 {
2667 	boolean_t wakeup;
2668 
2669 	mutex_enter(&z->zone_lock);
2670 	ASSERT(z->zone_ref != 0);
2671 	z->zone_ref--;
2672 	if (subsys != ZONE_REF_NUM_SUBSYS) {
2673 		ASSERT(z->zone_subsys_ref[subsys] != 0);
2674 		z->zone_subsys_ref[subsys]--;
2675 		list_remove(&z->zone_ref_list, ref);
2676 	}
2677 	if (z->zone_ref == 0 && z->zone_cred_ref == 0) {
2678 		/* no more refs, free the structure */
2679 		mutex_exit(&z->zone_lock);
2680 		zone_free(z);
2681 		return;
2682 	}
2683 	/* signal zone_destroy so the zone can finish halting */
2684 	wakeup = (ZONE_IS_UNREF(z) && zone_status_get(z) >= ZONE_IS_DEAD);
2685 	mutex_exit(&z->zone_lock);
2686 
2687 	if (wakeup) {
2688 		/*
2689 		 * Grabbing zonehash_lock here effectively synchronizes with
2690 		 * zone_destroy() to avoid missed signals.
2691 		 */
2692 		mutex_enter(&zonehash_lock);
2693 		cv_broadcast(&zone_destroy_cv);
2694 		mutex_exit(&zonehash_lock);
2695 	}
2696 }
2697 
2698 /*
2699  * Decrement the specified zone's reference count.  The specified zone will
2700  * cease to exist after this function returns if the reference count drops to
2701  * zero.  This function should be paired with zone_hold().
2702  */
2703 void
2704 zone_rele(zone_t *z)
2705 {
2706 	zone_rele_common(z, NULL, ZONE_REF_NUM_SUBSYS);
2707 }
2708 
2709 /*
2710  * Initialize a zone reference structure.  This function must be invoked for
2711  * a reference structure before the structure is passed to zone_hold_ref().
2712  */
2713 void
2714 zone_init_ref(zone_ref_t *ref)
2715 {
2716 	ref->zref_zone = NULL;
2717 	list_link_init(&ref->zref_linkage);
2718 }
2719 
2720 /*
2721  * Acquire a reference to zone z.  The caller must specify the
2722  * zone_ref_subsys_t constant associated with its subsystem.  The specified
2723  * zone_ref_t structure will represent a reference to the specified zone.  Use
2724  * zone_rele_ref() to release the reference.
2725  *
2726  * The referenced zone_t structure will not be freed as long as the zone_t's
2727  * zone_status field is not ZONE_IS_DEAD and the zone has outstanding
2728  * references.
2729  *
2730  * NOTE: The zone_ref_t structure must be initialized before it is used.
2731  * See zone_init_ref() above.
2732  */
2733 void
2734 zone_hold_ref(zone_t *z, zone_ref_t *ref, zone_ref_subsys_t subsys)
2735 {
2736 	ASSERT(subsys >= 0 && subsys < ZONE_REF_NUM_SUBSYS);
2737 
2738 	/*
2739 	 * Prevent consumers from reusing a reference structure before
2740 	 * releasing it.
2741 	 */
2742 	VERIFY(ref->zref_zone == NULL);
2743 
2744 	ref->zref_zone = z;
2745 	mutex_enter(&z->zone_lock);
2746 	zone_hold_locked(z);
2747 	z->zone_subsys_ref[subsys]++;
2748 	ASSERT(z->zone_subsys_ref[subsys] != 0);
2749 	list_insert_head(&z->zone_ref_list, ref);
2750 	mutex_exit(&z->zone_lock);
2751 }
2752 
2753 /*
2754  * Release the zone reference represented by the specified zone_ref_t.
2755  * The reference is invalid after it's released; however, the zone_ref_t
2756  * structure can be reused without having to invoke zone_init_ref().
2757  * subsys should be the same value that was passed to zone_hold_ref()
2758  * when the reference was acquired.
2759  */
2760 void
2761 zone_rele_ref(zone_ref_t *ref, zone_ref_subsys_t subsys)
2762 {
2763 	zone_rele_common(ref->zref_zone, ref, subsys);
2764 
2765 	/*
2766 	 * Set the zone_ref_t's zref_zone field to NULL to generate panics
2767 	 * when consumers dereference the reference.  This helps us catch
2768 	 * consumers who use released references.  Furthermore, this lets
2769 	 * consumers reuse the zone_ref_t structure without having to
2770 	 * invoke zone_init_ref().
2771 	 */
2772 	ref->zref_zone = NULL;
2773 }
2774 
2775 void
2776 zone_cred_hold(zone_t *z)
2777 {
2778 	mutex_enter(&z->zone_lock);
2779 	z->zone_cred_ref++;
2780 	ASSERT(z->zone_cred_ref != 0);
2781 	mutex_exit(&z->zone_lock);
2782 }
2783 
2784 void
2785 zone_cred_rele(zone_t *z)
2786 {
2787 	boolean_t wakeup;
2788 
2789 	mutex_enter(&z->zone_lock);
2790 	ASSERT(z->zone_cred_ref != 0);
2791 	z->zone_cred_ref--;
2792 	if (z->zone_ref == 0 && z->zone_cred_ref == 0) {
2793 		/* no more refs, free the structure */
2794 		mutex_exit(&z->zone_lock);
2795 		zone_free(z);
2796 		return;
2797 	}
2798 	/*
2799 	 * If zone_destroy is waiting for the cred references to drain
2800 	 * out, and they have, signal it.
2801 	 */
2802 	wakeup = (zone_wait_for_cred && ZONE_IS_UNREF(z) &&
2803 	    zone_status_get(z) >= ZONE_IS_DEAD);
2804 	mutex_exit(&z->zone_lock);
2805 
2806 	if (wakeup) {
2807 		/*
2808 		 * Grabbing zonehash_lock here effectively synchronizes with
2809 		 * zone_destroy() to avoid missed signals.
2810 		 */
2811 		mutex_enter(&zonehash_lock);
2812 		cv_broadcast(&zone_destroy_cv);
2813 		mutex_exit(&zonehash_lock);
2814 	}
2815 }
2816 
2817 void
2818 zone_task_hold(zone_t *z)
2819 {
2820 	mutex_enter(&z->zone_lock);
2821 	z->zone_ntasks++;
2822 	ASSERT(z->zone_ntasks != 0);
2823 	mutex_exit(&z->zone_lock);
2824 }
2825 
2826 void
2827 zone_task_rele(zone_t *zone)
2828 {
2829 	uint_t refcnt;
2830 
2831 	mutex_enter(&zone->zone_lock);
2832 	ASSERT(zone->zone_ntasks != 0);
2833 	refcnt = --zone->zone_ntasks;
2834 	if (refcnt > 1)	{	/* Common case */
2835 		mutex_exit(&zone->zone_lock);
2836 		return;
2837 	}
2838 	zone_hold_locked(zone);	/* so we can use the zone_t later */
2839 	mutex_exit(&zone->zone_lock);
2840 	if (refcnt == 1) {
2841 		/*
2842 		 * See if the zone is shutting down.
2843 		 */
2844 		mutex_enter(&zone_status_lock);
2845 		if (zone_status_get(zone) != ZONE_IS_SHUTTING_DOWN) {
2846 			goto out;
2847 		}
2848 
2849 		/*
2850 		 * Make sure the ntasks didn't change since we
2851 		 * dropped zone_lock.
2852 		 */
2853 		mutex_enter(&zone->zone_lock);
2854 		if (refcnt != zone->zone_ntasks) {
2855 			mutex_exit(&zone->zone_lock);
2856 			goto out;
2857 		}
2858 		mutex_exit(&zone->zone_lock);
2859 
2860 		/*
2861 		 * No more user processes in the zone.  The zone is empty.
2862 		 */
2863 		zone_status_set(zone, ZONE_IS_EMPTY);
2864 		goto out;
2865 	}
2866 
2867 	ASSERT(refcnt == 0);
2868 	/*
2869 	 * zsched has exited; the zone is dead.
2870 	 */
2871 	zone->zone_zsched = NULL;		/* paranoia */
2872 	mutex_enter(&zone_status_lock);
2873 	zone_status_set(zone, ZONE_IS_DEAD);
2874 out:
2875 	mutex_exit(&zone_status_lock);
2876 	zone_rele(zone);
2877 }
2878 
2879 zoneid_t
2880 getzoneid(void)
2881 {
2882 	return (curproc->p_zone->zone_id);
2883 }
2884 
2885 /*
2886  * Internal versions of zone_find_by_*().  These don't zone_hold() or
2887  * check the validity of a zone's state.
2888  */
2889 static zone_t *
2890 zone_find_all_by_id(zoneid_t zoneid)
2891 {
2892 	mod_hash_val_t hv;
2893 	zone_t *zone = NULL;
2894 
2895 	ASSERT(MUTEX_HELD(&zonehash_lock));
2896 
2897 	if (mod_hash_find(zonehashbyid,
2898 	    (mod_hash_key_t)(uintptr_t)zoneid, &hv) == 0)
2899 		zone = (zone_t *)hv;
2900 	return (zone);
2901 }
2902 
2903 static zone_t *
2904 zone_find_all_by_label(const ts_label_t *label)
2905 {
2906 	mod_hash_val_t hv;
2907 	zone_t *zone = NULL;
2908 
2909 	ASSERT(MUTEX_HELD(&zonehash_lock));
2910 
2911 	/*
2912 	 * zonehashbylabel is not maintained for unlabeled systems
2913 	 */
2914 	if (!is_system_labeled())
2915 		return (NULL);
2916 	if (mod_hash_find(zonehashbylabel, (mod_hash_key_t)label, &hv) == 0)
2917 		zone = (zone_t *)hv;
2918 	return (zone);
2919 }
2920 
2921 static zone_t *
2922 zone_find_all_by_name(char *name)
2923 {
2924 	mod_hash_val_t hv;
2925 	zone_t *zone = NULL;
2926 
2927 	ASSERT(MUTEX_HELD(&zonehash_lock));
2928 
2929 	if (mod_hash_find(zonehashbyname, (mod_hash_key_t)name, &hv) == 0)
2930 		zone = (zone_t *)hv;
2931 	return (zone);
2932 }
2933 
2934 /*
2935  * Public interface for looking up a zone by zoneid.  Only returns the zone if
2936  * it is fully initialized, and has not yet begun the zone_destroy() sequence.
2937  * Caller must call zone_rele() once it is done with the zone.
2938  *
2939  * The zone may begin the zone_destroy() sequence immediately after this
2940  * function returns, but may be safely used until zone_rele() is called.
2941  */
2942 zone_t *
2943 zone_find_by_id(zoneid_t zoneid)
2944 {
2945 	zone_t *zone;
2946 	zone_status_t status;
2947 
2948 	mutex_enter(&zonehash_lock);
2949 	if ((zone = zone_find_all_by_id(zoneid)) == NULL) {
2950 		mutex_exit(&zonehash_lock);
2951 		return (NULL);
2952 	}
2953 	status = zone_status_get(zone);
2954 	if (status < ZONE_IS_READY || status > ZONE_IS_DOWN) {
2955 		/*
2956 		 * For all practical purposes the zone doesn't exist.
2957 		 */
2958 		mutex_exit(&zonehash_lock);
2959 		return (NULL);
2960 	}
2961 	zone_hold(zone);
2962 	mutex_exit(&zonehash_lock);
2963 	return (zone);
2964 }
2965 
2966 /*
2967  * Similar to zone_find_by_id, but using zone label as the key.
2968  */
2969 zone_t *
2970 zone_find_by_label(const ts_label_t *label)
2971 {
2972 	zone_t *zone;
2973 	zone_status_t status;
2974 
2975 	mutex_enter(&zonehash_lock);
2976 	if ((zone = zone_find_all_by_label(label)) == NULL) {
2977 		mutex_exit(&zonehash_lock);
2978 		return (NULL);
2979 	}
2980 
2981 	status = zone_status_get(zone);
2982 	if (status > ZONE_IS_DOWN) {
2983 		/*
2984 		 * For all practical purposes the zone doesn't exist.
2985 		 */
2986 		mutex_exit(&zonehash_lock);
2987 		return (NULL);
2988 	}
2989 	zone_hold(zone);
2990 	mutex_exit(&zonehash_lock);
2991 	return (zone);
2992 }
2993 
2994 /*
2995  * Similar to zone_find_by_id, but using zone name as the key.
2996  */
2997 zone_t *
2998 zone_find_by_name(char *name)
2999 {
3000 	zone_t *zone;
3001 	zone_status_t status;
3002 
3003 	mutex_enter(&zonehash_lock);
3004 	if ((zone = zone_find_all_by_name(name)) == NULL) {
3005 		mutex_exit(&zonehash_lock);
3006 		return (NULL);
3007 	}
3008 	status = zone_status_get(zone);
3009 	if (status < ZONE_IS_READY || status > ZONE_IS_DOWN) {
3010 		/*
3011 		 * For all practical purposes the zone doesn't exist.
3012 		 */
3013 		mutex_exit(&zonehash_lock);
3014 		return (NULL);
3015 	}
3016 	zone_hold(zone);
3017 	mutex_exit(&zonehash_lock);
3018 	return (zone);
3019 }
3020 
3021 /*
3022  * Similar to zone_find_by_id(), using the path as a key.  For instance,
3023  * if there is a zone "foo" rooted at /foo/root, and the path argument
3024  * is "/foo/root/proc", it will return the held zone_t corresponding to
3025  * zone "foo".
3026  *
3027  * zone_find_by_path() always returns a non-NULL value, since at the
3028  * very least every path will be contained in the global zone.
3029  *
3030  * As with the other zone_find_by_*() functions, the caller is
3031  * responsible for zone_rele()ing the return value of this function.
3032  */
3033 zone_t *
3034 zone_find_by_path(const char *path)
3035 {
3036 	zone_t *zone;
3037 	zone_t *zret = NULL;
3038 	zone_status_t status;
3039 
3040 	if (path == NULL) {
3041 		/*
3042 		 * Call from rootconf().
3043 		 */
3044 		zone_hold(global_zone);
3045 		return (global_zone);
3046 	}
3047 	ASSERT(*path == '/');
3048 	mutex_enter(&zonehash_lock);
3049 	for (zone = list_head(&zone_active); zone != NULL;
3050 	    zone = list_next(&zone_active, zone)) {
3051 		if (ZONE_PATH_VISIBLE(path, zone))
3052 			zret = zone;
3053 	}
3054 	ASSERT(zret != NULL);
3055 	status = zone_status_get(zret);
3056 	if (status < ZONE_IS_READY || status > ZONE_IS_DOWN) {
3057 		/*
3058 		 * Zone practically doesn't exist.
3059 		 */
3060 		zret = global_zone;
3061 	}
3062 	zone_hold(zret);
3063 	mutex_exit(&zonehash_lock);
3064 	return (zret);
3065 }
3066 
3067 /*
3068  * Public interface for updating per-zone load averages.  Called once per
3069  * second.
3070  *
3071  * Based on loadavg_update(), genloadavg() and calcloadavg() from clock.c.
3072  */
3073 void
3074 zone_loadavg_update()
3075 {
3076 	zone_t *zp;
3077 	zone_status_t status;
3078 	struct loadavg_s *lavg;
3079 	hrtime_t zone_total;
3080 	int i;
3081 	hrtime_t hr_avg;
3082 	int nrun;
3083 	static int64_t f[3] = { 135, 27, 9 };
3084 	int64_t q, r;
3085 
3086 	mutex_enter(&zonehash_lock);
3087 	for (zp = list_head(&zone_active); zp != NULL;
3088 	    zp = list_next(&zone_active, zp)) {
3089 		mutex_enter(&zp->zone_lock);
3090 
3091 		/* Skip zones that are on the way down or not yet up */
3092 		status = zone_status_get(zp);
3093 		if (status < ZONE_IS_READY || status >= ZONE_IS_DOWN) {
3094 			/* For all practical purposes the zone doesn't exist. */
3095 			mutex_exit(&zp->zone_lock);
3096 			continue;
3097 		}
3098 
3099 		/*
3100 		 * Update the 10 second moving average data in zone_loadavg.
3101 		 */
3102 		lavg = &zp->zone_loadavg;
3103 
3104 		zone_total = zp->zone_utime + zp->zone_stime + zp->zone_wtime;
3105 		scalehrtime(&zone_total);
3106 
3107 		/* The zone_total should always be increasing. */
3108 		lavg->lg_loads[lavg->lg_cur] = (zone_total > lavg->lg_total) ?
3109 		    zone_total - lavg->lg_total : 0;
3110 		lavg->lg_cur = (lavg->lg_cur + 1) % S_LOADAVG_SZ;
3111 		/* lg_total holds the prev. 1 sec. total */
3112 		lavg->lg_total = zone_total;
3113 
3114 		/*
3115 		 * To simplify the calculation, we don't calculate the load avg.
3116 		 * until the zone has been up for at least 10 seconds and our
3117 		 * moving average is thus full.
3118 		 */
3119 		if ((lavg->lg_len + 1) < S_LOADAVG_SZ) {
3120 			lavg->lg_len++;
3121 			mutex_exit(&zp->zone_lock);
3122 			continue;
3123 		}
3124 
3125 		/* Now calculate the 1min, 5min, 15 min load avg. */
3126 		hr_avg = 0;
3127 		for (i = 0; i < S_LOADAVG_SZ; i++)
3128 			hr_avg += lavg->lg_loads[i];
3129 		hr_avg = hr_avg / S_LOADAVG_SZ;
3130 		nrun = hr_avg / (NANOSEC / LGRP_LOADAVG_IN_THREAD_MAX);
3131 
3132 		/* Compute load avg. See comment in calcloadavg() */
3133 		for (i = 0; i < 3; i++) {
3134 			q = (zp->zone_hp_avenrun[i] >> 16) << 7;
3135 			r = (zp->zone_hp_avenrun[i] & 0xffff) << 7;
3136 			zp->zone_hp_avenrun[i] +=
3137 			    ((nrun - q) * f[i] - ((r * f[i]) >> 16)) >> 4;
3138 
3139 			/* avenrun[] can only hold 31 bits of load avg. */
3140 			if (zp->zone_hp_avenrun[i] <
3141 			    ((uint64_t)1<<(31+16-FSHIFT)))
3142 				zp->zone_avenrun[i] = (int32_t)
3143 				    (zp->zone_hp_avenrun[i] >> (16 - FSHIFT));
3144 			else
3145 				zp->zone_avenrun[i] = 0x7fffffff;
3146 		}
3147 
3148 		mutex_exit(&zp->zone_lock);
3149 	}
3150 	mutex_exit(&zonehash_lock);
3151 }
3152 
3153 /*
3154  * Get the number of cpus visible to this zone.  The system-wide global
3155  * 'ncpus' is returned if pools are disabled, the caller is in the
3156  * global zone, or a NULL zone argument is passed in.
3157  */
3158 int
3159 zone_ncpus_get(zone_t *zone)
3160 {
3161 	int myncpus = zone == NULL ? 0 : zone->zone_ncpus;
3162 
3163 	return (myncpus != 0 ? myncpus : ncpus);
3164 }
3165 
3166 /*
3167  * Get the number of online cpus visible to this zone.  The system-wide
3168  * global 'ncpus_online' is returned if pools are disabled, the caller
3169  * is in the global zone, or a NULL zone argument is passed in.
3170  */
3171 int
3172 zone_ncpus_online_get(zone_t *zone)
3173 {
3174 	int myncpus_online = zone == NULL ? 0 : zone->zone_ncpus_online;
3175 
3176 	return (myncpus_online != 0 ? myncpus_online : ncpus_online);
3177 }
3178 
3179 /*
3180  * Return the pool to which the zone is currently bound.
3181  */
3182 pool_t *
3183 zone_pool_get(zone_t *zone)
3184 {
3185 	ASSERT(pool_lock_held());
3186 
3187 	return (zone->zone_pool);
3188 }
3189 
3190 /*
3191  * Set the zone's pool pointer and update the zone's visibility to match
3192  * the resources in the new pool.
3193  */
3194 void
3195 zone_pool_set(zone_t *zone, pool_t *pool)
3196 {
3197 	ASSERT(pool_lock_held());
3198 	ASSERT(MUTEX_HELD(&cpu_lock));
3199 
3200 	zone->zone_pool = pool;
3201 	zone_pset_set(zone, pool->pool_pset->pset_id);
3202 }
3203 
3204 /*
3205  * Return the cached value of the id of the processor set to which the
3206  * zone is currently bound.  The value will be ZONE_PS_INVAL if the pools
3207  * facility is disabled.
3208  */
3209 psetid_t
3210 zone_pset_get(zone_t *zone)
3211 {
3212 	ASSERT(MUTEX_HELD(&cpu_lock));
3213 
3214 	return (zone->zone_psetid);
3215 }
3216 
3217 /*
3218  * Set the cached value of the id of the processor set to which the zone
3219  * is currently bound.  Also update the zone's visibility to match the
3220  * resources in the new processor set.
3221  */
3222 void
3223 zone_pset_set(zone_t *zone, psetid_t newpsetid)
3224 {
3225 	psetid_t oldpsetid;
3226 
3227 	ASSERT(MUTEX_HELD(&cpu_lock));
3228 	oldpsetid = zone_pset_get(zone);
3229 
3230 	if (oldpsetid == newpsetid)
3231 		return;
3232 	/*
3233 	 * Global zone sees all.
3234 	 */
3235 	if (zone != global_zone) {
3236 		zone->zone_psetid = newpsetid;
3237 		if (newpsetid != ZONE_PS_INVAL)
3238 			pool_pset_visibility_add(newpsetid, zone);
3239 		if (oldpsetid != ZONE_PS_INVAL)
3240 			pool_pset_visibility_remove(oldpsetid, zone);
3241 	}
3242 	/*
3243 	 * Disabling pools, so we should start using the global values
3244 	 * for ncpus and ncpus_online.
3245 	 */
3246 	if (newpsetid == ZONE_PS_INVAL) {
3247 		zone->zone_ncpus = 0;
3248 		zone->zone_ncpus_online = 0;
3249 	}
3250 }
3251 
3252 /*
3253  * Walk the list of active zones and issue the provided callback for
3254  * each of them.
3255  *
3256  * Caller must not be holding any locks that may be acquired under
3257  * zonehash_lock.  See comment at the beginning of the file for a list of
3258  * common locks and their interactions with zones.
3259  */
3260 int
3261 zone_walk(int (*cb)(zone_t *, void *), void *data)
3262 {
3263 	zone_t *zone;
3264 	int ret = 0;
3265 	zone_status_t status;
3266 
3267 	mutex_enter(&zonehash_lock);
3268 	for (zone = list_head(&zone_active); zone != NULL;
3269 	    zone = list_next(&zone_active, zone)) {
3270 		/*
3271 		 * Skip zones that shouldn't be externally visible.
3272 		 */
3273 		status = zone_status_get(zone);
3274 		if (status < ZONE_IS_READY || status > ZONE_IS_DOWN)
3275 			continue;
3276 		/*
3277 		 * Bail immediately if any callback invocation returns a
3278 		 * non-zero value.
3279 		 */
3280 		ret = (*cb)(zone, data);
3281 		if (ret != 0)
3282 			break;
3283 	}
3284 	mutex_exit(&zonehash_lock);
3285 	return (ret);
3286 }
3287 
3288 static int
3289 zone_set_root(zone_t *zone, const char *upath)
3290 {
3291 	vnode_t *vp;
3292 	int trycount;
3293 	int error = 0;
3294 	char *path;
3295 	struct pathname upn, pn;
3296 	size_t pathlen;
3297 
3298 	if ((error = pn_get((char *)upath, UIO_USERSPACE, &upn)) != 0)
3299 		return (error);
3300 
3301 	pn_alloc(&pn);
3302 
3303 	/* prevent infinite loop */
3304 	trycount = 10;
3305 	for (;;) {
3306 		if (--trycount <= 0) {
3307 			error = ESTALE;
3308 			goto out;
3309 		}
3310 
3311 		if ((error = lookuppn(&upn, &pn, FOLLOW, NULLVPP, &vp)) == 0) {
3312 			/*
3313 			 * VOP_ACCESS() may cover 'vp' with a new
3314 			 * filesystem, if 'vp' is an autoFS vnode.
3315 			 * Get the new 'vp' if so.
3316 			 */
3317 			if ((error =
3318 			    VOP_ACCESS(vp, VEXEC, 0, CRED(), NULL)) == 0 &&
3319 			    (!vn_ismntpt(vp) ||
3320 			    (error = traverse(&vp)) == 0)) {
3321 				pathlen = pn.pn_pathlen + 2;
3322 				path = kmem_alloc(pathlen, KM_SLEEP);
3323 				(void) strncpy(path, pn.pn_path,
3324 				    pn.pn_pathlen + 1);
3325 				path[pathlen - 2] = '/';
3326 				path[pathlen - 1] = '\0';
3327 				pn_free(&pn);
3328 				pn_free(&upn);
3329 
3330 				/* Success! */
3331 				break;
3332 			}
3333 			VN_RELE(vp);
3334 		}
3335 		if (error != ESTALE)
3336 			goto out;
3337 	}
3338 
3339 	ASSERT(error == 0);
3340 	zone->zone_rootvp = vp;		/* we hold a reference to vp */
3341 	zone->zone_rootpath = path;
3342 	zone->zone_rootpathlen = pathlen;
3343 	if (pathlen > 5 && strcmp(path + pathlen - 5, "/lu/") == 0)
3344 		zone->zone_flags |= ZF_IS_SCRATCH;
3345 	return (0);
3346 
3347 out:
3348 	pn_free(&pn);
3349 	pn_free(&upn);
3350 	return (error);
3351 }
3352 
3353 #define	isalnum(c)	(((c) >= '0' && (c) <= '9') || \
3354 			((c) >= 'a' && (c) <= 'z') || \
3355 			((c) >= 'A' && (c) <= 'Z'))
3356 
3357 static int
3358 zone_set_name(zone_t *zone, const char *uname)
3359 {
3360 	char *kname = kmem_zalloc(ZONENAME_MAX, KM_SLEEP);
3361 	size_t len;
3362 	int i, err;
3363 
3364 	if ((err = copyinstr(uname, kname, ZONENAME_MAX, &len)) != 0) {
3365 		kmem_free(kname, ZONENAME_MAX);
3366 		return (err);	/* EFAULT or ENAMETOOLONG */
3367 	}
3368 
3369 	/* must be less than ZONENAME_MAX */
3370 	if (len == ZONENAME_MAX && kname[ZONENAME_MAX - 1] != '\0') {
3371 		kmem_free(kname, ZONENAME_MAX);
3372 		return (EINVAL);
3373 	}
3374 
3375 	/*
3376 	 * Name must start with an alphanumeric and must contain only
3377 	 * alphanumerics, '-', '_' and '.'.
3378 	 */
3379 	if (!isalnum(kname[0])) {
3380 		kmem_free(kname, ZONENAME_MAX);
3381 		return (EINVAL);
3382 	}
3383 	for (i = 1; i < len - 1; i++) {
3384 		if (!isalnum(kname[i]) && kname[i] != '-' && kname[i] != '_' &&
3385 		    kname[i] != '.') {
3386 			kmem_free(kname, ZONENAME_MAX);
3387 			return (EINVAL);
3388 		}
3389 	}
3390 
3391 	zone->zone_name = kname;
3392 	return (0);
3393 }
3394 
3395 /*
3396  * Gets the 32-bit hostid of the specified zone as an unsigned int.  If 'zonep'
3397  * is NULL or it points to a zone with no hostid emulation, then the machine's
3398  * hostid (i.e., the global zone's hostid) is returned.  This function returns
3399  * zero if neither the zone nor the host machine (global zone) have hostids.  It
3400  * returns HW_INVALID_HOSTID if the function attempts to return the machine's
3401  * hostid and the machine's hostid is invalid.
3402  */
3403 uint32_t
3404 zone_get_hostid(zone_t *zonep)
3405 {
3406 	unsigned long machine_hostid;
3407 
3408 	if (zonep == NULL || zonep->zone_hostid == HW_INVALID_HOSTID) {
3409 		if (ddi_strtoul(hw_serial, NULL, 10, &machine_hostid) != 0)
3410 			return (HW_INVALID_HOSTID);
3411 		return ((uint32_t)machine_hostid);
3412 	}
3413 	return (zonep->zone_hostid);
3414 }
3415 
3416 /*
3417  * Similar to thread_create(), but makes sure the thread is in the appropriate
3418  * zone's zsched process (curproc->p_zone->zone_zsched) before returning.
3419  */
3420 /*ARGSUSED*/
3421 kthread_t *
3422 zthread_create(
3423     caddr_t stk,
3424     size_t stksize,
3425     void (*proc)(),
3426     void *arg,
3427     size_t len,
3428     pri_t pri)
3429 {
3430 	kthread_t *t;
3431 	zone_t *zone = curproc->p_zone;
3432 	proc_t *pp = zone->zone_zsched;
3433 
3434 	zone_hold(zone);	/* Reference to be dropped when thread exits */
3435 
3436 	/*
3437 	 * No-one should be trying to create threads if the zone is shutting
3438 	 * down and there aren't any kernel threads around.  See comment
3439 	 * in zthread_exit().
3440 	 */
3441 	ASSERT(!(zone->zone_kthreads == NULL &&
3442 	    zone_status_get(zone) >= ZONE_IS_EMPTY));
3443 	/*
3444 	 * Create a thread, but don't let it run until we've finished setting
3445 	 * things up.
3446 	 */
3447 	t = thread_create(stk, stksize, proc, arg, len, pp, TS_STOPPED, pri);
3448 	ASSERT(t->t_forw == NULL);
3449 	mutex_enter(&zone_status_lock);
3450 	if (zone->zone_kthreads == NULL) {
3451 		t->t_forw = t->t_back = t;
3452 	} else {
3453 		kthread_t *tx = zone->zone_kthreads;
3454 
3455 		t->t_forw = tx;
3456 		t->t_back = tx->t_back;
3457 		tx->t_back->t_forw = t;
3458 		tx->t_back = t;
3459 	}
3460 	zone->zone_kthreads = t;
3461 	mutex_exit(&zone_status_lock);
3462 
3463 	mutex_enter(&pp->p_lock);
3464 	t->t_proc_flag |= TP_ZTHREAD;
3465 	project_rele(t->t_proj);
3466 	t->t_proj = project_hold(pp->p_task->tk_proj);
3467 
3468 	/*
3469 	 * Setup complete, let it run.
3470 	 */
3471 	thread_lock(t);
3472 	t->t_schedflag |= TS_ALLSTART;
3473 	setrun_locked(t);
3474 	thread_unlock(t);
3475 
3476 	mutex_exit(&pp->p_lock);
3477 
3478 	return (t);
3479 }
3480 
3481 /*
3482  * Similar to thread_exit().  Must be called by threads created via
3483  * zthread_exit().
3484  */
3485 void
3486 zthread_exit(void)
3487 {
3488 	kthread_t *t = curthread;
3489 	proc_t *pp = curproc;
3490 	zone_t *zone = pp->p_zone;
3491 
3492 	mutex_enter(&zone_status_lock);
3493 
3494 	/*
3495 	 * Reparent to p0
3496 	 */
3497 	kpreempt_disable();
3498 	mutex_enter(&pp->p_lock);
3499 	t->t_proc_flag &= ~TP_ZTHREAD;
3500 	t->t_procp = &p0;
3501 	hat_thread_exit(t);
3502 	mutex_exit(&pp->p_lock);
3503 	kpreempt_enable();
3504 
3505 	if (t->t_back == t) {
3506 		ASSERT(t->t_forw == t);
3507 		/*
3508 		 * If the zone is empty, once the thread count
3509 		 * goes to zero no further kernel threads can be
3510 		 * created.  This is because if the creator is a process
3511 		 * in the zone, then it must have exited before the zone
3512 		 * state could be set to ZONE_IS_EMPTY.
3513 		 * Otherwise, if the creator is a kernel thread in the
3514 		 * zone, the thread count is non-zero.
3515 		 *
3516 		 * This really means that non-zone kernel threads should
3517 		 * not create zone kernel threads.
3518 		 */
3519 		zone->zone_kthreads = NULL;
3520 		if (zone_status_get(zone) == ZONE_IS_EMPTY) {
3521 			zone_status_set(zone, ZONE_IS_DOWN);
3522 			/*
3523 			 * Remove any CPU caps on this zone.
3524 			 */
3525 			cpucaps_zone_remove(zone);
3526 		}
3527 	} else {
3528 		t->t_forw->t_back = t->t_back;
3529 		t->t_back->t_forw = t->t_forw;
3530 		if (zone->zone_kthreads == t)
3531 			zone->zone_kthreads = t->t_forw;
3532 	}
3533 	mutex_exit(&zone_status_lock);
3534 	zone_rele(zone);
3535 	thread_exit();
3536 	/* NOTREACHED */
3537 }
3538 
3539 static void
3540 zone_chdir(vnode_t *vp, vnode_t **vpp, proc_t *pp)
3541 {
3542 	vnode_t *oldvp;
3543 
3544 	/* we're going to hold a reference here to the directory */
3545 	VN_HOLD(vp);
3546 
3547 	/* update abs cwd/root path see c2/audit.c */
3548 	if (AU_AUDITING())
3549 		audit_chdirec(vp, vpp);
3550 
3551 	mutex_enter(&pp->p_lock);
3552 	oldvp = *vpp;
3553 	*vpp = vp;
3554 	mutex_exit(&pp->p_lock);
3555 	if (oldvp != NULL)
3556 		VN_RELE(oldvp);
3557 }
3558 
3559 /*
3560  * Convert an rctl value represented by an nvlist_t into an rctl_val_t.
3561  */
3562 static int
3563 nvlist2rctlval(nvlist_t *nvl, rctl_val_t *rv)
3564 {
3565 	nvpair_t *nvp = NULL;
3566 	boolean_t priv_set = B_FALSE;
3567 	boolean_t limit_set = B_FALSE;
3568 	boolean_t action_set = B_FALSE;
3569 
3570 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
3571 		const char *name;
3572 		uint64_t ui64;
3573 
3574 		name = nvpair_name(nvp);
3575 		if (nvpair_type(nvp) != DATA_TYPE_UINT64)
3576 			return (EINVAL);
3577 		(void) nvpair_value_uint64(nvp, &ui64);
3578 		if (strcmp(name, "privilege") == 0) {
3579 			/*
3580 			 * Currently only privileged values are allowed, but
3581 			 * this may change in the future.
3582 			 */
3583 			if (ui64 != RCPRIV_PRIVILEGED)
3584 				return (EINVAL);
3585 			rv->rcv_privilege = ui64;
3586 			priv_set = B_TRUE;
3587 		} else if (strcmp(name, "limit") == 0) {
3588 			rv->rcv_value = ui64;
3589 			limit_set = B_TRUE;
3590 		} else if (strcmp(name, "action") == 0) {
3591 			if (ui64 != RCTL_LOCAL_NOACTION &&
3592 			    ui64 != RCTL_LOCAL_DENY)
3593 				return (EINVAL);
3594 			rv->rcv_flagaction = ui64;
3595 			action_set = B_TRUE;
3596 		} else {
3597 			return (EINVAL);
3598 		}
3599 	}
3600 
3601 	if (!(priv_set && limit_set && action_set))
3602 		return (EINVAL);
3603 	rv->rcv_action_signal = 0;
3604 	rv->rcv_action_recipient = NULL;
3605 	rv->rcv_action_recip_pid = -1;
3606 	rv->rcv_firing_time = 0;
3607 
3608 	return (0);
3609 }
3610 
3611 /*
3612  * Non-global zone version of start_init.
3613  */
3614 void
3615 zone_start_init(void)
3616 {
3617 	proc_t *p = ttoproc(curthread);
3618 	zone_t *z = p->p_zone;
3619 
3620 	ASSERT(!INGLOBALZONE(curproc));
3621 
3622 	/*
3623 	 * For all purposes (ZONE_ATTR_INITPID and restart_init),
3624 	 * storing just the pid of init is sufficient.
3625 	 */
3626 	z->zone_proc_initpid = p->p_pid;
3627 
3628 	/*
3629 	 * We maintain zone_boot_err so that we can return the cause of the
3630 	 * failure back to the caller of the zone_boot syscall.
3631 	 */
3632 	p->p_zone->zone_boot_err = start_init_common();
3633 
3634 	/*
3635 	 * We will prevent booting zones from becoming running zones if the
3636 	 * global zone is shutting down.
3637 	 */
3638 	mutex_enter(&zone_status_lock);
3639 	if (z->zone_boot_err != 0 || zone_status_get(global_zone) >=
3640 	    ZONE_IS_SHUTTING_DOWN) {
3641 		/*
3642 		 * Make sure we are still in the booting state-- we could have
3643 		 * raced and already be shutting down, or even further along.
3644 		 */
3645 		if (zone_status_get(z) == ZONE_IS_BOOTING) {
3646 			zone_status_set(z, ZONE_IS_SHUTTING_DOWN);
3647 		}
3648 		mutex_exit(&zone_status_lock);
3649 		/* It's gone bad, dispose of the process */
3650 		if (proc_exit(CLD_EXITED, z->zone_boot_err) != 0) {
3651 			mutex_enter(&p->p_lock);
3652 			ASSERT(p->p_flag & SEXITLWPS);
3653 			lwp_exit();
3654 		}
3655 	} else {
3656 		if (zone_status_get(z) == ZONE_IS_BOOTING)
3657 			zone_status_set(z, ZONE_IS_RUNNING);
3658 		mutex_exit(&zone_status_lock);
3659 		/* cause the process to return to userland. */
3660 		lwp_rtt();
3661 	}
3662 }
3663 
3664 struct zsched_arg {
3665 	zone_t *zone;
3666 	nvlist_t *nvlist;
3667 };
3668 
3669 /*
3670  * Per-zone "sched" workalike.  The similarity to "sched" doesn't have
3671  * anything to do with scheduling, but rather with the fact that
3672  * per-zone kernel threads are parented to zsched, just like regular
3673  * kernel threads are parented to sched (p0).
3674  *
3675  * zsched is also responsible for launching init for the zone.
3676  */
3677 static void
3678 zsched(void *arg)
3679 {
3680 	struct zsched_arg *za = arg;
3681 	proc_t *pp = curproc;
3682 	proc_t *initp = proc_init;
3683 	zone_t *zone = za->zone;
3684 	cred_t *cr, *oldcred;
3685 	rctl_set_t *set;
3686 	rctl_alloc_gp_t *gp;
3687 	contract_t *ct = NULL;
3688 	task_t *tk, *oldtk;
3689 	rctl_entity_p_t e;
3690 	kproject_t *pj;
3691 
3692 	nvlist_t *nvl = za->nvlist;
3693 	nvpair_t *nvp = NULL;
3694 
3695 	bcopy("zsched", PTOU(pp)->u_psargs, sizeof ("zsched"));
3696 	bcopy("zsched", PTOU(pp)->u_comm, sizeof ("zsched"));
3697 	PTOU(pp)->u_argc = 0;
3698 	PTOU(pp)->u_argv = NULL;
3699 	PTOU(pp)->u_envp = NULL;
3700 	closeall(P_FINFO(pp));
3701 
3702 	/*
3703 	 * We are this zone's "zsched" process.  As the zone isn't generally
3704 	 * visible yet we don't need to grab any locks before initializing its
3705 	 * zone_proc pointer.
3706 	 */
3707 	zone_hold(zone);  /* this hold is released by zone_destroy() */
3708 	zone->zone_zsched = pp;
3709 	mutex_enter(&pp->p_lock);
3710 	pp->p_zone = zone;
3711 	mutex_exit(&pp->p_lock);
3712 
3713 	/*
3714 	 * Disassociate process from its 'parent'; parent ourselves to init
3715 	 * (pid 1) and change other values as needed.
3716 	 */
3717 	sess_create();
3718 
3719 	mutex_enter(&pidlock);
3720 	proc_detach(pp);
3721 	pp->p_ppid = 1;
3722 	pp->p_flag |= SZONETOP;
3723 	pp->p_ancpid = 1;
3724 	pp->p_parent = initp;
3725 	pp->p_psibling = NULL;
3726 	if (initp->p_child)
3727 		initp->p_child->p_psibling = pp;
3728 	pp->p_sibling = initp->p_child;
3729 	initp->p_child = pp;
3730 
3731 	/* Decrement what newproc() incremented. */
3732 	upcount_dec(crgetruid(CRED()), GLOBAL_ZONEID);
3733 	/*
3734 	 * Our credentials are about to become kcred-like, so we don't care
3735 	 * about the caller's ruid.
3736 	 */
3737 	upcount_inc(crgetruid(kcred), zone->zone_id);
3738 	mutex_exit(&pidlock);
3739 
3740 	/*
3741 	 * getting out of global zone, so decrement lwp and process counts
3742 	 */
3743 	pj = pp->p_task->tk_proj;
3744 	mutex_enter(&global_zone->zone_nlwps_lock);
3745 	pj->kpj_nlwps -= pp->p_lwpcnt;
3746 	global_zone->zone_nlwps -= pp->p_lwpcnt;
3747 	pj->kpj_nprocs--;
3748 	global_zone->zone_nprocs--;
3749 	mutex_exit(&global_zone->zone_nlwps_lock);
3750 
3751 	/*
3752 	 * Decrement locked memory counts on old zone and project.
3753 	 */
3754 	mutex_enter(&global_zone->zone_mem_lock);
3755 	global_zone->zone_locked_mem -= pp->p_locked_mem;
3756 	pj->kpj_data.kpd_locked_mem -= pp->p_locked_mem;
3757 	mutex_exit(&global_zone->zone_mem_lock);
3758 
3759 	/*
3760 	 * Create and join a new task in project '0' of this zone.
3761 	 *
3762 	 * We don't need to call holdlwps() since we know we're the only lwp in
3763 	 * this process.
3764 	 *
3765 	 * task_join() returns with p_lock held.
3766 	 */
3767 	tk = task_create(0, zone);
3768 	mutex_enter(&cpu_lock);
3769 	oldtk = task_join(tk, 0);
3770 
3771 	pj = pp->p_task->tk_proj;
3772 
3773 	mutex_enter(&zone->zone_mem_lock);
3774 	zone->zone_locked_mem += pp->p_locked_mem;
3775 	pj->kpj_data.kpd_locked_mem += pp->p_locked_mem;
3776 	mutex_exit(&zone->zone_mem_lock);
3777 
3778 	/*
3779 	 * add lwp and process counts to zsched's zone, and increment
3780 	 * project's task and process count due to the task created in
3781 	 * the above task_create.
3782 	 */
3783 	mutex_enter(&zone->zone_nlwps_lock);
3784 	pj->kpj_nlwps += pp->p_lwpcnt;
3785 	pj->kpj_ntasks += 1;
3786 	zone->zone_nlwps += pp->p_lwpcnt;
3787 	pj->kpj_nprocs++;
3788 	zone->zone_nprocs++;
3789 	mutex_exit(&zone->zone_nlwps_lock);
3790 
3791 	mutex_exit(&curproc->p_lock);
3792 	mutex_exit(&cpu_lock);
3793 	task_rele(oldtk);
3794 
3795 	/*
3796 	 * The process was created by a process in the global zone, hence the
3797 	 * credentials are wrong.  We might as well have kcred-ish credentials.
3798 	 */
3799 	cr = zone->zone_kcred;
3800 	crhold(cr);
3801 	mutex_enter(&pp->p_crlock);
3802 	oldcred = pp->p_cred;
3803 	pp->p_cred = cr;
3804 	mutex_exit(&pp->p_crlock);
3805 	crfree(oldcred);
3806 
3807 	/*
3808 	 * Hold credentials again (for thread)
3809 	 */
3810 	crhold(cr);
3811 
3812 	/*
3813 	 * p_lwpcnt can't change since this is a kernel process.
3814 	 */
3815 	crset(pp, cr);
3816 
3817 	/*
3818 	 * Chroot
3819 	 */
3820 	zone_chdir(zone->zone_rootvp, &PTOU(pp)->u_cdir, pp);
3821 	zone_chdir(zone->zone_rootvp, &PTOU(pp)->u_rdir, pp);
3822 
3823 	/*
3824 	 * Initialize zone's rctl set.
3825 	 */
3826 	set = rctl_set_create();
3827 	gp = rctl_set_init_prealloc(RCENTITY_ZONE);
3828 	mutex_enter(&pp->p_lock);
3829 	e.rcep_p.zone = zone;
3830 	e.rcep_t = RCENTITY_ZONE;
3831 	zone->zone_rctls = rctl_set_init(RCENTITY_ZONE, pp, &e, set, gp);
3832 	mutex_exit(&pp->p_lock);
3833 	rctl_prealloc_destroy(gp);
3834 
3835 	/*
3836 	 * Apply the rctls passed in to zone_create().  This is basically a list
3837 	 * assignment: all of the old values are removed and the new ones
3838 	 * inserted.  That is, if an empty list is passed in, all values are
3839 	 * removed.
3840 	 */
3841 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
3842 		rctl_dict_entry_t *rde;
3843 		rctl_hndl_t hndl;
3844 		char *name;
3845 		nvlist_t **nvlarray;
3846 		uint_t i, nelem;
3847 		int error;	/* For ASSERT()s */
3848 
3849 		name = nvpair_name(nvp);
3850 		hndl = rctl_hndl_lookup(name);
3851 		ASSERT(hndl != -1);
3852 		rde = rctl_dict_lookup_hndl(hndl);
3853 		ASSERT(rde != NULL);
3854 
3855 		for (; /* ever */; ) {
3856 			rctl_val_t oval;
3857 
3858 			mutex_enter(&pp->p_lock);
3859 			error = rctl_local_get(hndl, NULL, &oval, pp);
3860 			mutex_exit(&pp->p_lock);
3861 			ASSERT(error == 0);	/* Can't fail for RCTL_FIRST */
3862 			ASSERT(oval.rcv_privilege != RCPRIV_BASIC);
3863 			if (oval.rcv_privilege == RCPRIV_SYSTEM)
3864 				break;
3865 			mutex_enter(&pp->p_lock);
3866 			error = rctl_local_delete(hndl, &oval, pp);
3867 			mutex_exit(&pp->p_lock);
3868 			ASSERT(error == 0);
3869 		}
3870 		error = nvpair_value_nvlist_array(nvp, &nvlarray, &nelem);
3871 		ASSERT(error == 0);
3872 		for (i = 0; i < nelem; i++) {
3873 			rctl_val_t *nvalp;
3874 
3875 			nvalp = kmem_cache_alloc(rctl_val_cache, KM_SLEEP);
3876 			error = nvlist2rctlval(nvlarray[i], nvalp);
3877 			ASSERT(error == 0);
3878 			/*
3879 			 * rctl_local_insert can fail if the value being
3880 			 * inserted is a duplicate; this is OK.
3881 			 */
3882 			mutex_enter(&pp->p_lock);
3883 			if (rctl_local_insert(hndl, nvalp, pp) != 0)
3884 				kmem_cache_free(rctl_val_cache, nvalp);
3885 			mutex_exit(&pp->p_lock);
3886 		}
3887 	}
3888 	/*
3889 	 * Tell the world that we're done setting up.
3890 	 *
3891 	 * At this point we want to set the zone status to ZONE_IS_INITIALIZED
3892 	 * and atomically set the zone's processor set visibility.  Once
3893 	 * we drop pool_lock() this zone will automatically get updated
3894 	 * to reflect any future changes to the pools configuration.
3895 	 *
3896 	 * Note that after we drop the locks below (zonehash_lock in
3897 	 * particular) other operations such as a zone_getattr call can
3898 	 * now proceed and observe the zone. That is the reason for doing a
3899 	 * state transition to the INITIALIZED state.
3900 	 */
3901 	pool_lock();
3902 	mutex_enter(&cpu_lock);
3903 	mutex_enter(&zonehash_lock);
3904 	zone_uniqid(zone);
3905 	zone_zsd_configure(zone);
3906 	if (pool_state == POOL_ENABLED)
3907 		zone_pset_set(zone, pool_default->pool_pset->pset_id);
3908 	mutex_enter(&zone_status_lock);
3909 	ASSERT(zone_status_get(zone) == ZONE_IS_UNINITIALIZED);
3910 	zone_status_set(zone, ZONE_IS_INITIALIZED);
3911 	mutex_exit(&zone_status_lock);
3912 	mutex_exit(&zonehash_lock);
3913 	mutex_exit(&cpu_lock);
3914 	pool_unlock();
3915 
3916 	/* Now call the create callback for this key */
3917 	zsd_apply_all_keys(zsd_apply_create, zone);
3918 
3919 	/* The callbacks are complete. Mark ZONE_IS_READY */
3920 	mutex_enter(&zone_status_lock);
3921 	ASSERT(zone_status_get(zone) == ZONE_IS_INITIALIZED);
3922 	zone_status_set(zone, ZONE_IS_READY);
3923 	mutex_exit(&zone_status_lock);
3924 
3925 	/*
3926 	 * Once we see the zone transition to the ZONE_IS_BOOTING state,
3927 	 * we launch init, and set the state to running.
3928 	 */
3929 	zone_status_wait_cpr(zone, ZONE_IS_BOOTING, "zsched");
3930 
3931 	if (zone_status_get(zone) == ZONE_IS_BOOTING) {
3932 		id_t cid;
3933 
3934 		/*
3935 		 * Ok, this is a little complicated.  We need to grab the
3936 		 * zone's pool's scheduling class ID; note that by now, we
3937 		 * are already bound to a pool if we need to be (zoneadmd
3938 		 * will have done that to us while we're in the READY
3939 		 * state).  *But* the scheduling class for the zone's 'init'
3940 		 * must be explicitly passed to newproc, which doesn't
3941 		 * respect pool bindings.
3942 		 *
3943 		 * We hold the pool_lock across the call to newproc() to
3944 		 * close the obvious race: the pool's scheduling class
3945 		 * could change before we manage to create the LWP with
3946 		 * classid 'cid'.
3947 		 */
3948 		pool_lock();
3949 		if (zone->zone_defaultcid > 0)
3950 			cid = zone->zone_defaultcid;
3951 		else
3952 			cid = pool_get_class(zone->zone_pool);
3953 		if (cid == -1)
3954 			cid = defaultcid;
3955 
3956 		/*
3957 		 * If this fails, zone_boot will ultimately fail.  The
3958 		 * state of the zone will be set to SHUTTING_DOWN-- userland
3959 		 * will have to tear down the zone, and fail, or try again.
3960 		 */
3961 		if ((zone->zone_boot_err = newproc(zone_start_init, NULL, cid,
3962 		    minclsyspri - 1, &ct, 0)) != 0) {
3963 			mutex_enter(&zone_status_lock);
3964 			zone_status_set(zone, ZONE_IS_SHUTTING_DOWN);
3965 			mutex_exit(&zone_status_lock);
3966 		} else {
3967 			zone->zone_boot_time = gethrestime_sec();
3968 		}
3969 
3970 		pool_unlock();
3971 	}
3972 
3973 	/*
3974 	 * Wait for zone_destroy() to be called.  This is what we spend
3975 	 * most of our life doing.
3976 	 */
3977 	zone_status_wait_cpr(zone, ZONE_IS_DYING, "zsched");
3978 
3979 	if (ct)
3980 		/*
3981 		 * At this point the process contract should be empty.
3982 		 * (Though if it isn't, it's not the end of the world.)
3983 		 */
3984 		VERIFY(contract_abandon(ct, curproc, B_TRUE) == 0);
3985 
3986 	/*
3987 	 * Allow kcred to be freed when all referring processes
3988 	 * (including this one) go away.  We can't just do this in
3989 	 * zone_free because we need to wait for the zone_cred_ref to
3990 	 * drop to 0 before calling zone_free, and the existence of
3991 	 * zone_kcred will prevent that.  Thus, we call crfree here to
3992 	 * balance the crdup in zone_create.  The crhold calls earlier
3993 	 * in zsched will be dropped when the thread and process exit.
3994 	 */
3995 	crfree(zone->zone_kcred);
3996 	zone->zone_kcred = NULL;
3997 
3998 	exit(CLD_EXITED, 0);
3999 }
4000 
4001 /*
4002  * Helper function to determine if there are any submounts of the
4003  * provided path.  Used to make sure the zone doesn't "inherit" any
4004  * mounts from before it is created.
4005  */
4006 static uint_t
4007 zone_mount_count(const char *rootpath)
4008 {
4009 	vfs_t *vfsp;
4010 	uint_t count = 0;
4011 	size_t rootpathlen = strlen(rootpath);
4012 
4013 	/*
4014 	 * Holding zonehash_lock prevents race conditions with
4015 	 * vfs_list_add()/vfs_list_remove() since we serialize with
4016 	 * zone_find_by_path().
4017 	 */
4018 	ASSERT(MUTEX_HELD(&zonehash_lock));
4019 	/*
4020 	 * The rootpath must end with a '/'
4021 	 */
4022 	ASSERT(rootpath[rootpathlen - 1] == '/');
4023 
4024 	/*
4025 	 * This intentionally does not count the rootpath itself if that
4026 	 * happens to be a mount point.
4027 	 */
4028 	vfs_list_read_lock();
4029 	vfsp = rootvfs;
4030 	do {
4031 		if (strncmp(rootpath, refstr_value(vfsp->vfs_mntpt),
4032 		    rootpathlen) == 0)
4033 			count++;
4034 		vfsp = vfsp->vfs_next;
4035 	} while (vfsp != rootvfs);
4036 	vfs_list_unlock();
4037 	return (count);
4038 }
4039 
4040 /*
4041  * Helper function to make sure that a zone created on 'rootpath'
4042  * wouldn't end up containing other zones' rootpaths.
4043  */
4044 static boolean_t
4045 zone_is_nested(const char *rootpath)
4046 {
4047 	zone_t *zone;
4048 	size_t rootpathlen = strlen(rootpath);
4049 	size_t len;
4050 
4051 	ASSERT(MUTEX_HELD(&zonehash_lock));
4052 
4053 	/*
4054 	 * zone_set_root() appended '/' and '\0' at the end of rootpath
4055 	 */
4056 	if ((rootpathlen <= 3) && (rootpath[0] == '/') &&
4057 	    (rootpath[1] == '/') && (rootpath[2] == '\0'))
4058 		return (B_TRUE);
4059 
4060 	for (zone = list_head(&zone_active); zone != NULL;
4061 	    zone = list_next(&zone_active, zone)) {
4062 		if (zone == global_zone)
4063 			continue;
4064 		len = strlen(zone->zone_rootpath);
4065 		if (strncmp(rootpath, zone->zone_rootpath,
4066 		    MIN(rootpathlen, len)) == 0)
4067 			return (B_TRUE);
4068 	}
4069 	return (B_FALSE);
4070 }
4071 
4072 static int
4073 zone_set_privset(zone_t *zone, const priv_set_t *zone_privs,
4074     size_t zone_privssz)
4075 {
4076 	priv_set_t *privs;
4077 
4078 	if (zone_privssz < sizeof (priv_set_t))
4079 		return (ENOMEM);
4080 
4081 	privs = kmem_alloc(sizeof (priv_set_t), KM_SLEEP);
4082 
4083 	if (copyin(zone_privs, privs, sizeof (priv_set_t))) {
4084 		kmem_free(privs, sizeof (priv_set_t));
4085 		return (EFAULT);
4086 	}
4087 
4088 	zone->zone_privset = privs;
4089 	return (0);
4090 }
4091 
4092 /*
4093  * We make creative use of nvlists to pass in rctls from userland.  The list is
4094  * a list of the following structures:
4095  *
4096  * (name = rctl_name, value = nvpair_list_array)
4097  *
4098  * Where each element of the nvpair_list_array is of the form:
4099  *
4100  * [(name = "privilege", value = RCPRIV_PRIVILEGED),
4101  * 	(name = "limit", value = uint64_t),
4102  * 	(name = "action", value = (RCTL_LOCAL_NOACTION || RCTL_LOCAL_DENY))]
4103  */
4104 static int
4105 parse_rctls(caddr_t ubuf, size_t buflen, nvlist_t **nvlp)
4106 {
4107 	nvpair_t *nvp = NULL;
4108 	nvlist_t *nvl = NULL;
4109 	char *kbuf;
4110 	int error;
4111 	rctl_val_t rv;
4112 
4113 	*nvlp = NULL;
4114 
4115 	if (buflen == 0)
4116 		return (0);
4117 
4118 	if ((kbuf = kmem_alloc(buflen, KM_NOSLEEP)) == NULL)
4119 		return (ENOMEM);
4120 	if (copyin(ubuf, kbuf, buflen)) {
4121 		error = EFAULT;
4122 		goto out;
4123 	}
4124 	if (nvlist_unpack(kbuf, buflen, &nvl, KM_SLEEP) != 0) {
4125 		/*
4126 		 * nvl may have been allocated/free'd, but the value set to
4127 		 * non-NULL, so we reset it here.
4128 		 */
4129 		nvl = NULL;
4130 		error = EINVAL;
4131 		goto out;
4132 	}
4133 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4134 		rctl_dict_entry_t *rde;
4135 		rctl_hndl_t hndl;
4136 		nvlist_t **nvlarray;
4137 		uint_t i, nelem;
4138 		char *name;
4139 
4140 		error = EINVAL;
4141 		name = nvpair_name(nvp);
4142 		if (strncmp(nvpair_name(nvp), "zone.", sizeof ("zone.") - 1)
4143 		    != 0 || nvpair_type(nvp) != DATA_TYPE_NVLIST_ARRAY) {
4144 			goto out;
4145 		}
4146 		if ((hndl = rctl_hndl_lookup(name)) == -1) {
4147 			goto out;
4148 		}
4149 		rde = rctl_dict_lookup_hndl(hndl);
4150 		error = nvpair_value_nvlist_array(nvp, &nvlarray, &nelem);
4151 		ASSERT(error == 0);
4152 		for (i = 0; i < nelem; i++) {
4153 			if (error = nvlist2rctlval(nvlarray[i], &rv))
4154 				goto out;
4155 		}
4156 		if (rctl_invalid_value(rde, &rv)) {
4157 			error = EINVAL;
4158 			goto out;
4159 		}
4160 	}
4161 	error = 0;
4162 	*nvlp = nvl;
4163 out:
4164 	kmem_free(kbuf, buflen);
4165 	if (error && nvl != NULL)
4166 		nvlist_free(nvl);
4167 	return (error);
4168 }
4169 
4170 int
4171 zone_create_error(int er_error, int er_ext, int *er_out) {
4172 	if (er_out != NULL) {
4173 		if (copyout(&er_ext, er_out, sizeof (int))) {
4174 			return (set_errno(EFAULT));
4175 		}
4176 	}
4177 	return (set_errno(er_error));
4178 }
4179 
4180 static int
4181 zone_set_label(zone_t *zone, const bslabel_t *lab, uint32_t doi)
4182 {
4183 	ts_label_t *tsl;
4184 	bslabel_t blab;
4185 
4186 	/* Get label from user */
4187 	if (copyin(lab, &blab, sizeof (blab)) != 0)
4188 		return (EFAULT);
4189 	tsl = labelalloc(&blab, doi, KM_NOSLEEP);
4190 	if (tsl == NULL)
4191 		return (ENOMEM);
4192 
4193 	zone->zone_slabel = tsl;
4194 	return (0);
4195 }
4196 
4197 /*
4198  * Parses a comma-separated list of ZFS datasets into a per-zone dictionary.
4199  */
4200 static int
4201 parse_zfs(zone_t *zone, caddr_t ubuf, size_t buflen)
4202 {
4203 	char *kbuf;
4204 	char *dataset, *next;
4205 	zone_dataset_t *zd;
4206 	size_t len;
4207 
4208 	if (ubuf == NULL || buflen == 0)
4209 		return (0);
4210 
4211 	if ((kbuf = kmem_alloc(buflen, KM_NOSLEEP)) == NULL)
4212 		return (ENOMEM);
4213 
4214 	if (copyin(ubuf, kbuf, buflen) != 0) {
4215 		kmem_free(kbuf, buflen);
4216 		return (EFAULT);
4217 	}
4218 
4219 	dataset = next = kbuf;
4220 	for (;;) {
4221 		zd = kmem_alloc(sizeof (zone_dataset_t), KM_SLEEP);
4222 
4223 		next = strchr(dataset, ',');
4224 
4225 		if (next == NULL)
4226 			len = strlen(dataset);
4227 		else
4228 			len = next - dataset;
4229 
4230 		zd->zd_dataset = kmem_alloc(len + 1, KM_SLEEP);
4231 		bcopy(dataset, zd->zd_dataset, len);
4232 		zd->zd_dataset[len] = '\0';
4233 
4234 		list_insert_head(&zone->zone_datasets, zd);
4235 
4236 		if (next == NULL)
4237 			break;
4238 
4239 		dataset = next + 1;
4240 	}
4241 
4242 	kmem_free(kbuf, buflen);
4243 	return (0);
4244 }
4245 
4246 /*
4247  * System call to create/initialize a new zone named 'zone_name', rooted
4248  * at 'zone_root', with a zone-wide privilege limit set of 'zone_privs',
4249  * and initialized with the zone-wide rctls described in 'rctlbuf', and
4250  * with labeling set by 'match', 'doi', and 'label'.
4251  *
4252  * If extended error is non-null, we may use it to return more detailed
4253  * error information.
4254  */
4255 static zoneid_t
4256 zone_create(const char *zone_name, const char *zone_root,
4257     const priv_set_t *zone_privs, size_t zone_privssz,
4258     caddr_t rctlbuf, size_t rctlbufsz,
4259     caddr_t zfsbuf, size_t zfsbufsz, int *extended_error,
4260     int match, uint32_t doi, const bslabel_t *label,
4261     int flags)
4262 {
4263 	struct zsched_arg zarg;
4264 	nvlist_t *rctls = NULL;
4265 	proc_t *pp = curproc;
4266 	zone_t *zone, *ztmp;
4267 	zoneid_t zoneid;
4268 	int error;
4269 	int error2 = 0;
4270 	char *str;
4271 	cred_t *zkcr;
4272 	boolean_t insert_label_hash;
4273 
4274 	if (secpolicy_zone_config(CRED()) != 0)
4275 		return (set_errno(EPERM));
4276 
4277 	/* can't boot zone from within chroot environment */
4278 	if (PTOU(pp)->u_rdir != NULL && PTOU(pp)->u_rdir != rootdir)
4279 		return (zone_create_error(ENOTSUP, ZE_CHROOTED,
4280 		    extended_error));
4281 
4282 	zone = kmem_zalloc(sizeof (zone_t), KM_SLEEP);
4283 	zoneid = zone->zone_id = id_alloc(zoneid_space);
4284 	zone->zone_status = ZONE_IS_UNINITIALIZED;
4285 	zone->zone_pool = pool_default;
4286 	zone->zone_pool_mod = gethrtime();
4287 	zone->zone_psetid = ZONE_PS_INVAL;
4288 	zone->zone_ncpus = 0;
4289 	zone->zone_ncpus_online = 0;
4290 	zone->zone_restart_init = B_TRUE;
4291 	zone->zone_brand = &native_brand;
4292 	zone->zone_initname = NULL;
4293 	mutex_init(&zone->zone_lock, NULL, MUTEX_DEFAULT, NULL);
4294 	mutex_init(&zone->zone_nlwps_lock, NULL, MUTEX_DEFAULT, NULL);
4295 	mutex_init(&zone->zone_mem_lock, NULL, MUTEX_DEFAULT, NULL);
4296 	cv_init(&zone->zone_cv, NULL, CV_DEFAULT, NULL);
4297 	list_create(&zone->zone_ref_list, sizeof (zone_ref_t),
4298 	    offsetof(zone_ref_t, zref_linkage));
4299 	list_create(&zone->zone_zsd, sizeof (struct zsd_entry),
4300 	    offsetof(struct zsd_entry, zsd_linkage));
4301 	list_create(&zone->zone_datasets, sizeof (zone_dataset_t),
4302 	    offsetof(zone_dataset_t, zd_linkage));
4303 	list_create(&zone->zone_dl_list, sizeof (zone_dl_t),
4304 	    offsetof(zone_dl_t, zdl_linkage));
4305 	rw_init(&zone->zone_mlps.mlpl_rwlock, NULL, RW_DEFAULT, NULL);
4306 	rw_init(&zone->zone_mntfs_db_lock, NULL, RW_DEFAULT, NULL);
4307 
4308 	if (flags & ZCF_NET_EXCL) {
4309 		zone->zone_flags |= ZF_NET_EXCL;
4310 	}
4311 
4312 	if ((error = zone_set_name(zone, zone_name)) != 0) {
4313 		zone_free(zone);
4314 		return (zone_create_error(error, 0, extended_error));
4315 	}
4316 
4317 	if ((error = zone_set_root(zone, zone_root)) != 0) {
4318 		zone_free(zone);
4319 		return (zone_create_error(error, 0, extended_error));
4320 	}
4321 	if ((error = zone_set_privset(zone, zone_privs, zone_privssz)) != 0) {
4322 		zone_free(zone);
4323 		return (zone_create_error(error, 0, extended_error));
4324 	}
4325 
4326 	/* initialize node name to be the same as zone name */
4327 	zone->zone_nodename = kmem_alloc(_SYS_NMLN, KM_SLEEP);
4328 	(void) strncpy(zone->zone_nodename, zone->zone_name, _SYS_NMLN);
4329 	zone->zone_nodename[_SYS_NMLN - 1] = '\0';
4330 
4331 	zone->zone_domain = kmem_alloc(_SYS_NMLN, KM_SLEEP);
4332 	zone->zone_domain[0] = '\0';
4333 	zone->zone_hostid = HW_INVALID_HOSTID;
4334 	zone->zone_shares = 1;
4335 	zone->zone_shmmax = 0;
4336 	zone->zone_ipc.ipcq_shmmni = 0;
4337 	zone->zone_ipc.ipcq_semmni = 0;
4338 	zone->zone_ipc.ipcq_msgmni = 0;
4339 	zone->zone_bootargs = NULL;
4340 	zone->zone_fs_allowed = NULL;
4341 	zone->zone_initname =
4342 	    kmem_alloc(strlen(zone_default_initname) + 1, KM_SLEEP);
4343 	(void) strcpy(zone->zone_initname, zone_default_initname);
4344 	zone->zone_nlwps = 0;
4345 	zone->zone_nlwps_ctl = INT_MAX;
4346 	zone->zone_nprocs = 0;
4347 	zone->zone_nprocs_ctl = INT_MAX;
4348 	zone->zone_locked_mem = 0;
4349 	zone->zone_locked_mem_ctl = UINT64_MAX;
4350 	zone->zone_max_swap = 0;
4351 	zone->zone_max_swap_ctl = UINT64_MAX;
4352 	zone->zone_max_lofi = 0;
4353 	zone->zone_max_lofi_ctl = UINT64_MAX;
4354 	zone0.zone_lockedmem_kstat = NULL;
4355 	zone0.zone_swapresv_kstat = NULL;
4356 
4357 	/*
4358 	 * Zsched initializes the rctls.
4359 	 */
4360 	zone->zone_rctls = NULL;
4361 
4362 	if ((error = parse_rctls(rctlbuf, rctlbufsz, &rctls)) != 0) {
4363 		zone_free(zone);
4364 		return (zone_create_error(error, 0, extended_error));
4365 	}
4366 
4367 	if ((error = parse_zfs(zone, zfsbuf, zfsbufsz)) != 0) {
4368 		zone_free(zone);
4369 		return (set_errno(error));
4370 	}
4371 
4372 	/*
4373 	 * Read in the trusted system parameters:
4374 	 * match flag and sensitivity label.
4375 	 */
4376 	zone->zone_match = match;
4377 	if (is_system_labeled() && !(zone->zone_flags & ZF_IS_SCRATCH)) {
4378 		/* Fail if requested to set doi to anything but system's doi */
4379 		if (doi != 0 && doi != default_doi) {
4380 			zone_free(zone);
4381 			return (set_errno(EINVAL));
4382 		}
4383 		/* Always apply system's doi to the zone */
4384 		error = zone_set_label(zone, label, default_doi);
4385 		if (error != 0) {
4386 			zone_free(zone);
4387 			return (set_errno(error));
4388 		}
4389 		insert_label_hash = B_TRUE;
4390 	} else {
4391 		/* all zones get an admin_low label if system is not labeled */
4392 		zone->zone_slabel = l_admin_low;
4393 		label_hold(l_admin_low);
4394 		insert_label_hash = B_FALSE;
4395 	}
4396 
4397 	/*
4398 	 * Stop all lwps since that's what normally happens as part of fork().
4399 	 * This needs to happen before we grab any locks to avoid deadlock
4400 	 * (another lwp in the process could be waiting for the held lock).
4401 	 */
4402 	if (curthread != pp->p_agenttp && !holdlwps(SHOLDFORK)) {
4403 		zone_free(zone);
4404 		nvlist_free(rctls);
4405 		return (zone_create_error(error, 0, extended_error));
4406 	}
4407 
4408 	if (block_mounts(zone) == 0) {
4409 		mutex_enter(&pp->p_lock);
4410 		if (curthread != pp->p_agenttp)
4411 			continuelwps(pp);
4412 		mutex_exit(&pp->p_lock);
4413 		zone_free(zone);
4414 		nvlist_free(rctls);
4415 		return (zone_create_error(error, 0, extended_error));
4416 	}
4417 
4418 	/*
4419 	 * Set up credential for kernel access.  After this, any errors
4420 	 * should go through the dance in errout rather than calling
4421 	 * zone_free directly.
4422 	 */
4423 	zone->zone_kcred = crdup(kcred);
4424 	crsetzone(zone->zone_kcred, zone);
4425 	priv_intersect(zone->zone_privset, &CR_PPRIV(zone->zone_kcred));
4426 	priv_intersect(zone->zone_privset, &CR_EPRIV(zone->zone_kcred));
4427 	priv_intersect(zone->zone_privset, &CR_IPRIV(zone->zone_kcred));
4428 	priv_intersect(zone->zone_privset, &CR_LPRIV(zone->zone_kcred));
4429 
4430 	mutex_enter(&zonehash_lock);
4431 	/*
4432 	 * Make sure zone doesn't already exist.
4433 	 *
4434 	 * If the system and zone are labeled,
4435 	 * make sure no other zone exists that has the same label.
4436 	 */
4437 	if ((ztmp = zone_find_all_by_name(zone->zone_name)) != NULL ||
4438 	    (insert_label_hash &&
4439 	    (ztmp = zone_find_all_by_label(zone->zone_slabel)) != NULL)) {
4440 		zone_status_t status;
4441 
4442 		status = zone_status_get(ztmp);
4443 		if (status == ZONE_IS_READY || status == ZONE_IS_RUNNING)
4444 			error = EEXIST;
4445 		else
4446 			error = EBUSY;
4447 
4448 		if (insert_label_hash)
4449 			error2 = ZE_LABELINUSE;
4450 
4451 		goto errout;
4452 	}
4453 
4454 	/*
4455 	 * Don't allow zone creations which would cause one zone's rootpath to
4456 	 * be accessible from that of another (non-global) zone.
4457 	 */
4458 	if (zone_is_nested(zone->zone_rootpath)) {
4459 		error = EBUSY;
4460 		goto errout;
4461 	}
4462 
4463 	ASSERT(zonecount != 0);		/* check for leaks */
4464 	if (zonecount + 1 > maxzones) {
4465 		error = ENOMEM;
4466 		goto errout;
4467 	}
4468 
4469 	if (zone_mount_count(zone->zone_rootpath) != 0) {
4470 		error = EBUSY;
4471 		error2 = ZE_AREMOUNTS;
4472 		goto errout;
4473 	}
4474 
4475 	/*
4476 	 * Zone is still incomplete, but we need to drop all locks while
4477 	 * zsched() initializes this zone's kernel process.  We
4478 	 * optimistically add the zone to the hashtable and associated
4479 	 * lists so a parallel zone_create() doesn't try to create the
4480 	 * same zone.
4481 	 */
4482 	zonecount++;
4483 	(void) mod_hash_insert(zonehashbyid,
4484 	    (mod_hash_key_t)(uintptr_t)zone->zone_id,
4485 	    (mod_hash_val_t)(uintptr_t)zone);
4486 	str = kmem_alloc(strlen(zone->zone_name) + 1, KM_SLEEP);
4487 	(void) strcpy(str, zone->zone_name);
4488 	(void) mod_hash_insert(zonehashbyname, (mod_hash_key_t)str,
4489 	    (mod_hash_val_t)(uintptr_t)zone);
4490 	if (insert_label_hash) {
4491 		(void) mod_hash_insert(zonehashbylabel,
4492 		    (mod_hash_key_t)zone->zone_slabel, (mod_hash_val_t)zone);
4493 		zone->zone_flags |= ZF_HASHED_LABEL;
4494 	}
4495 
4496 	/*
4497 	 * Insert into active list.  At this point there are no 'hold's
4498 	 * on the zone, but everyone else knows not to use it, so we can
4499 	 * continue to use it.  zsched() will do a zone_hold() if the
4500 	 * newproc() is successful.
4501 	 */
4502 	list_insert_tail(&zone_active, zone);
4503 	mutex_exit(&zonehash_lock);
4504 
4505 	zarg.zone = zone;
4506 	zarg.nvlist = rctls;
4507 	/*
4508 	 * The process, task, and project rctls are probably wrong;
4509 	 * we need an interface to get the default values of all rctls,
4510 	 * and initialize zsched appropriately.  I'm not sure that that
4511 	 * makes much of a difference, though.
4512 	 */
4513 	error = newproc(zsched, (void *)&zarg, syscid, minclsyspri, NULL, 0);
4514 	if (error != 0) {
4515 		/*
4516 		 * We need to undo all globally visible state.
4517 		 */
4518 		mutex_enter(&zonehash_lock);
4519 		list_remove(&zone_active, zone);
4520 		if (zone->zone_flags & ZF_HASHED_LABEL) {
4521 			ASSERT(zone->zone_slabel != NULL);
4522 			(void) mod_hash_destroy(zonehashbylabel,
4523 			    (mod_hash_key_t)zone->zone_slabel);
4524 		}
4525 		(void) mod_hash_destroy(zonehashbyname,
4526 		    (mod_hash_key_t)(uintptr_t)zone->zone_name);
4527 		(void) mod_hash_destroy(zonehashbyid,
4528 		    (mod_hash_key_t)(uintptr_t)zone->zone_id);
4529 		ASSERT(zonecount > 1);
4530 		zonecount--;
4531 		goto errout;
4532 	}
4533 
4534 	/*
4535 	 * Zone creation can't fail from now on.
4536 	 */
4537 
4538 	/*
4539 	 * Create zone kstats
4540 	 */
4541 	zone_kstat_create(zone);
4542 
4543 	/*
4544 	 * Let the other lwps continue.
4545 	 */
4546 	mutex_enter(&pp->p_lock);
4547 	if (curthread != pp->p_agenttp)
4548 		continuelwps(pp);
4549 	mutex_exit(&pp->p_lock);
4550 
4551 	/*
4552 	 * Wait for zsched to finish initializing the zone.
4553 	 */
4554 	zone_status_wait(zone, ZONE_IS_READY);
4555 	/*
4556 	 * The zone is fully visible, so we can let mounts progress.
4557 	 */
4558 	resume_mounts(zone);
4559 	nvlist_free(rctls);
4560 
4561 	return (zoneid);
4562 
4563 errout:
4564 	mutex_exit(&zonehash_lock);
4565 	/*
4566 	 * Let the other lwps continue.
4567 	 */
4568 	mutex_enter(&pp->p_lock);
4569 	if (curthread != pp->p_agenttp)
4570 		continuelwps(pp);
4571 	mutex_exit(&pp->p_lock);
4572 
4573 	resume_mounts(zone);
4574 	nvlist_free(rctls);
4575 	/*
4576 	 * There is currently one reference to the zone, a cred_ref from
4577 	 * zone_kcred.  To free the zone, we call crfree, which will call
4578 	 * zone_cred_rele, which will call zone_free.
4579 	 */
4580 	ASSERT(zone->zone_cred_ref == 1);
4581 	ASSERT(zone->zone_kcred->cr_ref == 1);
4582 	ASSERT(zone->zone_ref == 0);
4583 	zkcr = zone->zone_kcred;
4584 	zone->zone_kcred = NULL;
4585 	crfree(zkcr);				/* triggers call to zone_free */
4586 	return (zone_create_error(error, error2, extended_error));
4587 }
4588 
4589 /*
4590  * Cause the zone to boot.  This is pretty simple, since we let zoneadmd do
4591  * the heavy lifting.  initname is the path to the program to launch
4592  * at the "top" of the zone; if this is NULL, we use the system default,
4593  * which is stored at zone_default_initname.
4594  */
4595 static int
4596 zone_boot(zoneid_t zoneid)
4597 {
4598 	int err;
4599 	zone_t *zone;
4600 
4601 	if (secpolicy_zone_config(CRED()) != 0)
4602 		return (set_errno(EPERM));
4603 	if (zoneid < MIN_USERZONEID || zoneid > MAX_ZONEID)
4604 		return (set_errno(EINVAL));
4605 
4606 	mutex_enter(&zonehash_lock);
4607 	/*
4608 	 * Look for zone under hash lock to prevent races with calls to
4609 	 * zone_shutdown, zone_destroy, etc.
4610 	 */
4611 	if ((zone = zone_find_all_by_id(zoneid)) == NULL) {
4612 		mutex_exit(&zonehash_lock);
4613 		return (set_errno(EINVAL));
4614 	}
4615 
4616 	mutex_enter(&zone_status_lock);
4617 	if (zone_status_get(zone) != ZONE_IS_READY) {
4618 		mutex_exit(&zone_status_lock);
4619 		mutex_exit(&zonehash_lock);
4620 		return (set_errno(EINVAL));
4621 	}
4622 	zone_status_set(zone, ZONE_IS_BOOTING);
4623 	mutex_exit(&zone_status_lock);
4624 
4625 	zone_hold(zone);	/* so we can use the zone_t later */
4626 	mutex_exit(&zonehash_lock);
4627 
4628 	if (zone_status_wait_sig(zone, ZONE_IS_RUNNING) == 0) {
4629 		zone_rele(zone);
4630 		return (set_errno(EINTR));
4631 	}
4632 
4633 	/*
4634 	 * Boot (starting init) might have failed, in which case the zone
4635 	 * will go to the SHUTTING_DOWN state; an appropriate errno will
4636 	 * be placed in zone->zone_boot_err, and so we return that.
4637 	 */
4638 	err = zone->zone_boot_err;
4639 	zone_rele(zone);
4640 	return (err ? set_errno(err) : 0);
4641 }
4642 
4643 /*
4644  * Kills all user processes in the zone, waiting for them all to exit
4645  * before returning.
4646  */
4647 static int
4648 zone_empty(zone_t *zone)
4649 {
4650 	int waitstatus;
4651 
4652 	/*
4653 	 * We need to drop zonehash_lock before killing all
4654 	 * processes, otherwise we'll deadlock with zone_find_*
4655 	 * which can be called from the exit path.
4656 	 */
4657 	ASSERT(MUTEX_NOT_HELD(&zonehash_lock));
4658 	while ((waitstatus = zone_status_timedwait_sig(zone,
4659 	    ddi_get_lbolt() + hz, ZONE_IS_EMPTY)) == -1) {
4660 		killall(zone->zone_id);
4661 	}
4662 	/*
4663 	 * return EINTR if we were signaled
4664 	 */
4665 	if (waitstatus == 0)
4666 		return (EINTR);
4667 	return (0);
4668 }
4669 
4670 /*
4671  * This function implements the policy for zone visibility.
4672  *
4673  * In standard Solaris, a non-global zone can only see itself.
4674  *
4675  * In Trusted Extensions, a labeled zone can lookup any zone whose label
4676  * it dominates. For this test, the label of the global zone is treated as
4677  * admin_high so it is special-cased instead of being checked for dominance.
4678  *
4679  * Returns true if zone attributes are viewable, false otherwise.
4680  */
4681 static boolean_t
4682 zone_list_access(zone_t *zone)
4683 {
4684 
4685 	if (curproc->p_zone == global_zone ||
4686 	    curproc->p_zone == zone) {
4687 		return (B_TRUE);
4688 	} else if (is_system_labeled() && !(zone->zone_flags & ZF_IS_SCRATCH)) {
4689 		bslabel_t *curproc_label;
4690 		bslabel_t *zone_label;
4691 
4692 		curproc_label = label2bslabel(curproc->p_zone->zone_slabel);
4693 		zone_label = label2bslabel(zone->zone_slabel);
4694 
4695 		if (zone->zone_id != GLOBAL_ZONEID &&
4696 		    bldominates(curproc_label, zone_label)) {
4697 			return (B_TRUE);
4698 		} else {
4699 			return (B_FALSE);
4700 		}
4701 	} else {
4702 		return (B_FALSE);
4703 	}
4704 }
4705 
4706 /*
4707  * Systemcall to start the zone's halt sequence.  By the time this
4708  * function successfully returns, all user processes and kernel threads
4709  * executing in it will have exited, ZSD shutdown callbacks executed,
4710  * and the zone status set to ZONE_IS_DOWN.
4711  *
4712  * It is possible that the call will interrupt itself if the caller is the
4713  * parent of any process running in the zone, and doesn't have SIGCHLD blocked.
4714  */
4715 static int
4716 zone_shutdown(zoneid_t zoneid)
4717 {
4718 	int error;
4719 	zone_t *zone;
4720 	zone_status_t status;
4721 
4722 	if (secpolicy_zone_config(CRED()) != 0)
4723 		return (set_errno(EPERM));
4724 	if (zoneid < MIN_USERZONEID || zoneid > MAX_ZONEID)
4725 		return (set_errno(EINVAL));
4726 
4727 	mutex_enter(&zonehash_lock);
4728 	/*
4729 	 * Look for zone under hash lock to prevent races with other
4730 	 * calls to zone_shutdown and zone_destroy.
4731 	 */
4732 	if ((zone = zone_find_all_by_id(zoneid)) == NULL) {
4733 		mutex_exit(&zonehash_lock);
4734 		return (set_errno(EINVAL));
4735 	}
4736 
4737 	/*
4738 	 * We have to drop zonehash_lock before calling block_mounts.
4739 	 * Hold the zone so we can continue to use the zone_t.
4740 	 */
4741 	zone_hold(zone);
4742 	mutex_exit(&zonehash_lock);
4743 
4744 	/*
4745 	 * Block mounts so that VFS_MOUNT() can get an accurate view of
4746 	 * the zone's status with regards to ZONE_IS_SHUTTING down.
4747 	 *
4748 	 * e.g. NFS can fail the mount if it determines that the zone
4749 	 * has already begun the shutdown sequence.
4750 	 *
4751 	 */
4752 	if (block_mounts(zone) == 0) {
4753 		zone_rele(zone);
4754 		return (set_errno(EINTR));
4755 	}
4756 
4757 	mutex_enter(&zonehash_lock);
4758 	mutex_enter(&zone_status_lock);
4759 	status = zone_status_get(zone);
4760 	/*
4761 	 * Fail if the zone isn't fully initialized yet.
4762 	 */
4763 	if (status < ZONE_IS_READY) {
4764 		mutex_exit(&zone_status_lock);
4765 		mutex_exit(&zonehash_lock);
4766 		resume_mounts(zone);
4767 		zone_rele(zone);
4768 		return (set_errno(EINVAL));
4769 	}
4770 	/*
4771 	 * If conditions required for zone_shutdown() to return have been met,
4772 	 * return success.
4773 	 */
4774 	if (status >= ZONE_IS_DOWN) {
4775 		mutex_exit(&zone_status_lock);
4776 		mutex_exit(&zonehash_lock);
4777 		resume_mounts(zone);
4778 		zone_rele(zone);
4779 		return (0);
4780 	}
4781 	/*
4782 	 * If zone_shutdown() hasn't been called before, go through the motions.
4783 	 * If it has, there's nothing to do but wait for the kernel threads to
4784 	 * drain.
4785 	 */
4786 	if (status < ZONE_IS_EMPTY) {
4787 		uint_t ntasks;
4788 
4789 		mutex_enter(&zone->zone_lock);
4790 		if ((ntasks = zone->zone_ntasks) != 1) {
4791 			/*
4792 			 * There's still stuff running.
4793 			 */
4794 			zone_status_set(zone, ZONE_IS_SHUTTING_DOWN);
4795 		}
4796 		mutex_exit(&zone->zone_lock);
4797 		if (ntasks == 1) {
4798 			/*
4799 			 * The only way to create another task is through
4800 			 * zone_enter(), which will block until we drop
4801 			 * zonehash_lock.  The zone is empty.
4802 			 */
4803 			if (zone->zone_kthreads == NULL) {
4804 				/*
4805 				 * Skip ahead to ZONE_IS_DOWN
4806 				 */
4807 				zone_status_set(zone, ZONE_IS_DOWN);
4808 			} else {
4809 				zone_status_set(zone, ZONE_IS_EMPTY);
4810 			}
4811 		}
4812 	}
4813 	mutex_exit(&zone_status_lock);
4814 	mutex_exit(&zonehash_lock);
4815 	resume_mounts(zone);
4816 
4817 	if (error = zone_empty(zone)) {
4818 		zone_rele(zone);
4819 		return (set_errno(error));
4820 	}
4821 	/*
4822 	 * After the zone status goes to ZONE_IS_DOWN this zone will no
4823 	 * longer be notified of changes to the pools configuration, so
4824 	 * in order to not end up with a stale pool pointer, we point
4825 	 * ourselves at the default pool and remove all resource
4826 	 * visibility.  This is especially important as the zone_t may
4827 	 * languish on the deathrow for a very long time waiting for
4828 	 * cred's to drain out.
4829 	 *
4830 	 * This rebinding of the zone can happen multiple times
4831 	 * (presumably due to interrupted or parallel systemcalls)
4832 	 * without any adverse effects.
4833 	 */
4834 	if (pool_lock_intr() != 0) {
4835 		zone_rele(zone);
4836 		return (set_errno(EINTR));
4837 	}
4838 	if (pool_state == POOL_ENABLED) {
4839 		mutex_enter(&cpu_lock);
4840 		zone_pool_set(zone, pool_default);
4841 		/*
4842 		 * The zone no longer needs to be able to see any cpus.
4843 		 */
4844 		zone_pset_set(zone, ZONE_PS_INVAL);
4845 		mutex_exit(&cpu_lock);
4846 	}
4847 	pool_unlock();
4848 
4849 	/*
4850 	 * ZSD shutdown callbacks can be executed multiple times, hence
4851 	 * it is safe to not be holding any locks across this call.
4852 	 */
4853 	zone_zsd_callbacks(zone, ZSD_SHUTDOWN);
4854 
4855 	mutex_enter(&zone_status_lock);
4856 	if (zone->zone_kthreads == NULL && zone_status_get(zone) < ZONE_IS_DOWN)
4857 		zone_status_set(zone, ZONE_IS_DOWN);
4858 	mutex_exit(&zone_status_lock);
4859 
4860 	/*
4861 	 * Wait for kernel threads to drain.
4862 	 */
4863 	if (!zone_status_wait_sig(zone, ZONE_IS_DOWN)) {
4864 		zone_rele(zone);
4865 		return (set_errno(EINTR));
4866 	}
4867 
4868 	/*
4869 	 * Zone can be become down/destroyable even if the above wait
4870 	 * returns EINTR, so any code added here may never execute.
4871 	 * (i.e. don't add code here)
4872 	 */
4873 
4874 	zone_rele(zone);
4875 	return (0);
4876 }
4877 
4878 /*
4879  * Log the specified zone's reference counts.  The caller should not be
4880  * holding the zone's zone_lock.
4881  */
4882 static void
4883 zone_log_refcounts(zone_t *zone)
4884 {
4885 	char *buffer;
4886 	char *buffer_position;
4887 	uint32_t buffer_size;
4888 	uint32_t index;
4889 	uint_t ref;
4890 	uint_t cred_ref;
4891 
4892 	/*
4893 	 * Construct a string representing the subsystem-specific reference
4894 	 * counts.  The counts are printed in ascending order by index into the
4895 	 * zone_t::zone_subsys_ref array.  The list will be surrounded by
4896 	 * square brackets [] and will only contain nonzero reference counts.
4897 	 *
4898 	 * The buffer will hold two square bracket characters plus ten digits,
4899 	 * one colon, one space, one comma, and some characters for a
4900 	 * subsystem name per subsystem-specific reference count.  (Unsigned 32-
4901 	 * bit integers have at most ten decimal digits.)  The last
4902 	 * reference count's comma is replaced by the closing square
4903 	 * bracket and a NULL character to terminate the string.
4904 	 *
4905 	 * NOTE: We have to grab the zone's zone_lock to create a consistent
4906 	 * snapshot of the zone's reference counters.
4907 	 *
4908 	 * First, figure out how much space the string buffer will need.
4909 	 * The buffer's size is stored in buffer_size.
4910 	 */
4911 	buffer_size = 2;			/* for the square brackets */
4912 	mutex_enter(&zone->zone_lock);
4913 	zone->zone_flags |= ZF_REFCOUNTS_LOGGED;
4914 	ref = zone->zone_ref;
4915 	cred_ref = zone->zone_cred_ref;
4916 	for (index = 0; index < ZONE_REF_NUM_SUBSYS; ++index)
4917 		if (zone->zone_subsys_ref[index] != 0)
4918 			buffer_size += strlen(zone_ref_subsys_names[index]) +
4919 			    13;
4920 	if (buffer_size == 2) {
4921 		/*
4922 		 * No subsystems had nonzero reference counts.  Don't bother
4923 		 * with allocating a buffer; just log the general-purpose and
4924 		 * credential reference counts.
4925 		 */
4926 		mutex_exit(&zone->zone_lock);
4927 		(void) strlog(0, 0, 1, SL_CONSOLE | SL_NOTE,
4928 		    "Zone '%s' (ID: %d) is shutting down, but %u zone "
4929 		    "references and %u credential references are still extant",
4930 		    zone->zone_name, zone->zone_id, ref, cred_ref);
4931 		return;
4932 	}
4933 
4934 	/*
4935 	 * buffer_size contains the exact number of characters that the
4936 	 * buffer will need.  Allocate the buffer and fill it with nonzero
4937 	 * subsystem-specific reference counts.  Surround the results with
4938 	 * square brackets afterwards.
4939 	 */
4940 	buffer = kmem_alloc(buffer_size, KM_SLEEP);
4941 	buffer_position = &buffer[1];
4942 	for (index = 0; index < ZONE_REF_NUM_SUBSYS; ++index) {
4943 		/*
4944 		 * NOTE: The DDI's version of sprintf() returns a pointer to
4945 		 * the modified buffer rather than the number of bytes written
4946 		 * (as in snprintf(3C)).  This is unfortunate and annoying.
4947 		 * Therefore, we'll use snprintf() with INT_MAX to get the
4948 		 * number of bytes written.  Using INT_MAX is safe because
4949 		 * the buffer is perfectly sized for the data: we'll never
4950 		 * overrun the buffer.
4951 		 */
4952 		if (zone->zone_subsys_ref[index] != 0)
4953 			buffer_position += snprintf(buffer_position, INT_MAX,
4954 			    "%s: %u,", zone_ref_subsys_names[index],
4955 			    zone->zone_subsys_ref[index]);
4956 	}
4957 	mutex_exit(&zone->zone_lock);
4958 	buffer[0] = '[';
4959 	ASSERT((uintptr_t)(buffer_position - buffer) < buffer_size);
4960 	ASSERT(buffer_position[0] == '\0' && buffer_position[-1] == ',');
4961 	buffer_position[-1] = ']';
4962 
4963 	/*
4964 	 * Log the reference counts and free the message buffer.
4965 	 */
4966 	(void) strlog(0, 0, 1, SL_CONSOLE | SL_NOTE,
4967 	    "Zone '%s' (ID: %d) is shutting down, but %u zone references and "
4968 	    "%u credential references are still extant %s", zone->zone_name,
4969 	    zone->zone_id, ref, cred_ref, buffer);
4970 	kmem_free(buffer, buffer_size);
4971 }
4972 
4973 /*
4974  * Systemcall entry point to finalize the zone halt process.  The caller
4975  * must have already successfully called zone_shutdown().
4976  *
4977  * Upon successful completion, the zone will have been fully destroyed:
4978  * zsched will have exited, destructor callbacks executed, and the zone
4979  * removed from the list of active zones.
4980  */
4981 static int
4982 zone_destroy(zoneid_t zoneid)
4983 {
4984 	uint64_t uniqid;
4985 	zone_t *zone;
4986 	zone_status_t status;
4987 	clock_t wait_time;
4988 	boolean_t log_refcounts;
4989 
4990 	if (secpolicy_zone_config(CRED()) != 0)
4991 		return (set_errno(EPERM));
4992 	if (zoneid < MIN_USERZONEID || zoneid > MAX_ZONEID)
4993 		return (set_errno(EINVAL));
4994 
4995 	mutex_enter(&zonehash_lock);
4996 	/*
4997 	 * Look for zone under hash lock to prevent races with other
4998 	 * calls to zone_destroy.
4999 	 */
5000 	if ((zone = zone_find_all_by_id(zoneid)) == NULL) {
5001 		mutex_exit(&zonehash_lock);
5002 		return (set_errno(EINVAL));
5003 	}
5004 
5005 	if (zone_mount_count(zone->zone_rootpath) != 0) {
5006 		mutex_exit(&zonehash_lock);
5007 		return (set_errno(EBUSY));
5008 	}
5009 	mutex_enter(&zone_status_lock);
5010 	status = zone_status_get(zone);
5011 	if (status < ZONE_IS_DOWN) {
5012 		mutex_exit(&zone_status_lock);
5013 		mutex_exit(&zonehash_lock);
5014 		return (set_errno(EBUSY));
5015 	} else if (status == ZONE_IS_DOWN) {
5016 		zone_status_set(zone, ZONE_IS_DYING); /* Tell zsched to exit */
5017 	}
5018 	mutex_exit(&zone_status_lock);
5019 	zone_hold(zone);
5020 	mutex_exit(&zonehash_lock);
5021 
5022 	/*
5023 	 * wait for zsched to exit
5024 	 */
5025 	zone_status_wait(zone, ZONE_IS_DEAD);
5026 	zone_zsd_callbacks(zone, ZSD_DESTROY);
5027 	zone->zone_netstack = NULL;
5028 	uniqid = zone->zone_uniqid;
5029 	zone_rele(zone);
5030 	zone = NULL;	/* potentially free'd */
5031 
5032 	log_refcounts = B_FALSE;
5033 	wait_time = SEC_TO_TICK(ZONE_DESTROY_TIMEOUT_SECS);
5034 	mutex_enter(&zonehash_lock);
5035 	for (; /* ever */; ) {
5036 		boolean_t unref;
5037 		boolean_t refs_have_been_logged;
5038 
5039 		if ((zone = zone_find_all_by_id(zoneid)) == NULL ||
5040 		    zone->zone_uniqid != uniqid) {
5041 			/*
5042 			 * The zone has gone away.  Necessary conditions
5043 			 * are met, so we return success.
5044 			 */
5045 			mutex_exit(&zonehash_lock);
5046 			return (0);
5047 		}
5048 		mutex_enter(&zone->zone_lock);
5049 		unref = ZONE_IS_UNREF(zone);
5050 		refs_have_been_logged = (zone->zone_flags &
5051 		    ZF_REFCOUNTS_LOGGED);
5052 		mutex_exit(&zone->zone_lock);
5053 		if (unref) {
5054 			/*
5055 			 * There is only one reference to the zone -- that
5056 			 * added when the zone was added to the hashtables --
5057 			 * and things will remain this way until we drop
5058 			 * zonehash_lock... we can go ahead and cleanup the
5059 			 * zone.
5060 			 */
5061 			break;
5062 		}
5063 
5064 		/*
5065 		 * Wait for zone_rele_common() or zone_cred_rele() to signal
5066 		 * zone_destroy_cv.  zone_destroy_cv is signaled only when
5067 		 * some zone's general-purpose reference count reaches one.
5068 		 * If ZONE_DESTROY_TIMEOUT_SECS seconds elapse while waiting
5069 		 * on zone_destroy_cv, then log the zone's reference counts and
5070 		 * continue to wait for zone_rele() and zone_cred_rele().
5071 		 */
5072 		if (!refs_have_been_logged) {
5073 			if (!log_refcounts) {
5074 				/*
5075 				 * This thread hasn't timed out waiting on
5076 				 * zone_destroy_cv yet.  Wait wait_time clock
5077 				 * ticks (initially ZONE_DESTROY_TIMEOUT_SECS
5078 				 * seconds) for the zone's references to clear.
5079 				 */
5080 				ASSERT(wait_time > 0);
5081 				wait_time = cv_reltimedwait_sig(
5082 				    &zone_destroy_cv, &zonehash_lock, wait_time,
5083 				    TR_SEC);
5084 				if (wait_time > 0) {
5085 					/*
5086 					 * A thread in zone_rele() or
5087 					 * zone_cred_rele() signaled
5088 					 * zone_destroy_cv before this thread's
5089 					 * wait timed out.  The zone might have
5090 					 * only one reference left; find out!
5091 					 */
5092 					continue;
5093 				} else if (wait_time == 0) {
5094 					/* The thread's process was signaled. */
5095 					mutex_exit(&zonehash_lock);
5096 					return (set_errno(EINTR));
5097 				}
5098 
5099 				/*
5100 				 * The thread timed out while waiting on
5101 				 * zone_destroy_cv.  Even though the thread
5102 				 * timed out, it has to check whether another
5103 				 * thread woke up from zone_destroy_cv and
5104 				 * destroyed the zone.
5105 				 *
5106 				 * If the zone still exists and has more than
5107 				 * one unreleased general-purpose reference,
5108 				 * then log the zone's reference counts.
5109 				 */
5110 				log_refcounts = B_TRUE;
5111 				continue;
5112 			}
5113 
5114 			/*
5115 			 * The thread already timed out on zone_destroy_cv while
5116 			 * waiting for subsystems to release the zone's last
5117 			 * general-purpose references.  Log the zone's reference
5118 			 * counts and wait indefinitely on zone_destroy_cv.
5119 			 */
5120 			zone_log_refcounts(zone);
5121 		}
5122 		if (cv_wait_sig(&zone_destroy_cv, &zonehash_lock) == 0) {
5123 			/* The thread's process was signaled. */
5124 			mutex_exit(&zonehash_lock);
5125 			return (set_errno(EINTR));
5126 		}
5127 	}
5128 
5129 	/*
5130 	 * Remove CPU cap for this zone now since we're not going to
5131 	 * fail below this point.
5132 	 */
5133 	cpucaps_zone_remove(zone);
5134 
5135 	/* Get rid of the zone's kstats */
5136 	zone_kstat_delete(zone);
5137 
5138 	/* remove the pfexecd doors */
5139 	if (zone->zone_pfexecd != NULL) {
5140 		klpd_freelist(&zone->zone_pfexecd);
5141 		zone->zone_pfexecd = NULL;
5142 	}
5143 
5144 	/* free brand specific data */
5145 	if (ZONE_IS_BRANDED(zone))
5146 		ZBROP(zone)->b_free_brand_data(zone);
5147 
5148 	/* Say goodbye to brand framework. */
5149 	brand_unregister_zone(zone->zone_brand);
5150 
5151 	/*
5152 	 * It is now safe to let the zone be recreated; remove it from the
5153 	 * lists.  The memory will not be freed until the last cred
5154 	 * reference goes away.
5155 	 */
5156 	ASSERT(zonecount > 1);	/* must be > 1; can't destroy global zone */
5157 	zonecount--;
5158 	/* remove from active list and hash tables */
5159 	list_remove(&zone_active, zone);
5160 	(void) mod_hash_destroy(zonehashbyname,
5161 	    (mod_hash_key_t)zone->zone_name);
5162 	(void) mod_hash_destroy(zonehashbyid,
5163 	    (mod_hash_key_t)(uintptr_t)zone->zone_id);
5164 	if (zone->zone_flags & ZF_HASHED_LABEL)
5165 		(void) mod_hash_destroy(zonehashbylabel,
5166 		    (mod_hash_key_t)zone->zone_slabel);
5167 	mutex_exit(&zonehash_lock);
5168 
5169 	/*
5170 	 * Release the root vnode; we're not using it anymore.  Nor should any
5171 	 * other thread that might access it exist.
5172 	 */
5173 	if (zone->zone_rootvp != NULL) {
5174 		VN_RELE(zone->zone_rootvp);
5175 		zone->zone_rootvp = NULL;
5176 	}
5177 
5178 	/* add to deathrow list */
5179 	mutex_enter(&zone_deathrow_lock);
5180 	list_insert_tail(&zone_deathrow, zone);
5181 	mutex_exit(&zone_deathrow_lock);
5182 
5183 	/*
5184 	 * Drop last reference (which was added by zsched()), this will
5185 	 * free the zone unless there are outstanding cred references.
5186 	 */
5187 	zone_rele(zone);
5188 	return (0);
5189 }
5190 
5191 /*
5192  * Systemcall entry point for zone_getattr(2).
5193  */
5194 static ssize_t
5195 zone_getattr(zoneid_t zoneid, int attr, void *buf, size_t bufsize)
5196 {
5197 	size_t size;
5198 	int error = 0, err;
5199 	zone_t *zone;
5200 	char *zonepath;
5201 	char *outstr;
5202 	zone_status_t zone_status;
5203 	pid_t initpid;
5204 	boolean_t global = (curzone == global_zone);
5205 	boolean_t inzone = (curzone->zone_id == zoneid);
5206 	ushort_t flags;
5207 	zone_net_data_t *zbuf;
5208 
5209 	mutex_enter(&zonehash_lock);
5210 	if ((zone = zone_find_all_by_id(zoneid)) == NULL) {
5211 		mutex_exit(&zonehash_lock);
5212 		return (set_errno(EINVAL));
5213 	}
5214 	zone_status = zone_status_get(zone);
5215 	if (zone_status < ZONE_IS_INITIALIZED) {
5216 		mutex_exit(&zonehash_lock);
5217 		return (set_errno(EINVAL));
5218 	}
5219 	zone_hold(zone);
5220 	mutex_exit(&zonehash_lock);
5221 
5222 	/*
5223 	 * If not in the global zone, don't show information about other zones,
5224 	 * unless the system is labeled and the local zone's label dominates
5225 	 * the other zone.
5226 	 */
5227 	if (!zone_list_access(zone)) {
5228 		zone_rele(zone);
5229 		return (set_errno(EINVAL));
5230 	}
5231 
5232 	switch (attr) {
5233 	case ZONE_ATTR_ROOT:
5234 		if (global) {
5235 			/*
5236 			 * Copy the path to trim the trailing "/" (except for
5237 			 * the global zone).
5238 			 */
5239 			if (zone != global_zone)
5240 				size = zone->zone_rootpathlen - 1;
5241 			else
5242 				size = zone->zone_rootpathlen;
5243 			zonepath = kmem_alloc(size, KM_SLEEP);
5244 			bcopy(zone->zone_rootpath, zonepath, size);
5245 			zonepath[size - 1] = '\0';
5246 		} else {
5247 			if (inzone || !is_system_labeled()) {
5248 				/*
5249 				 * Caller is not in the global zone.
5250 				 * if the query is on the current zone
5251 				 * or the system is not labeled,
5252 				 * just return faked-up path for current zone.
5253 				 */
5254 				zonepath = "/";
5255 				size = 2;
5256 			} else {
5257 				/*
5258 				 * Return related path for current zone.
5259 				 */
5260 				int prefix_len = strlen(zone_prefix);
5261 				int zname_len = strlen(zone->zone_name);
5262 
5263 				size = prefix_len + zname_len + 1;
5264 				zonepath = kmem_alloc(size, KM_SLEEP);
5265 				bcopy(zone_prefix, zonepath, prefix_len);
5266 				bcopy(zone->zone_name, zonepath +
5267 				    prefix_len, zname_len);
5268 				zonepath[size - 1] = '\0';
5269 			}
5270 		}
5271 		if (bufsize > size)
5272 			bufsize = size;
5273 		if (buf != NULL) {
5274 			err = copyoutstr(zonepath, buf, bufsize, NULL);
5275 			if (err != 0 && err != ENAMETOOLONG)
5276 				error = EFAULT;
5277 		}
5278 		if (global || (is_system_labeled() && !inzone))
5279 			kmem_free(zonepath, size);
5280 		break;
5281 
5282 	case ZONE_ATTR_NAME:
5283 		size = strlen(zone->zone_name) + 1;
5284 		if (bufsize > size)
5285 			bufsize = size;
5286 		if (buf != NULL) {
5287 			err = copyoutstr(zone->zone_name, buf, bufsize, NULL);
5288 			if (err != 0 && err != ENAMETOOLONG)
5289 				error = EFAULT;
5290 		}
5291 		break;
5292 
5293 	case ZONE_ATTR_STATUS:
5294 		/*
5295 		 * Since we're not holding zonehash_lock, the zone status
5296 		 * may be anything; leave it up to userland to sort it out.
5297 		 */
5298 		size = sizeof (zone_status);
5299 		if (bufsize > size)
5300 			bufsize = size;
5301 		zone_status = zone_status_get(zone);
5302 		if (buf != NULL &&
5303 		    copyout(&zone_status, buf, bufsize) != 0)
5304 			error = EFAULT;
5305 		break;
5306 	case ZONE_ATTR_FLAGS:
5307 		size = sizeof (zone->zone_flags);
5308 		if (bufsize > size)
5309 			bufsize = size;
5310 		flags = zone->zone_flags;
5311 		if (buf != NULL &&
5312 		    copyout(&flags, buf, bufsize) != 0)
5313 			error = EFAULT;
5314 		break;
5315 	case ZONE_ATTR_PRIVSET:
5316 		size = sizeof (priv_set_t);
5317 		if (bufsize > size)
5318 			bufsize = size;
5319 		if (buf != NULL &&
5320 		    copyout(zone->zone_privset, buf, bufsize) != 0)
5321 			error = EFAULT;
5322 		break;
5323 	case ZONE_ATTR_UNIQID:
5324 		size = sizeof (zone->zone_uniqid);
5325 		if (bufsize > size)
5326 			bufsize = size;
5327 		if (buf != NULL &&
5328 		    copyout(&zone->zone_uniqid, buf, bufsize) != 0)
5329 			error = EFAULT;
5330 		break;
5331 	case ZONE_ATTR_POOLID:
5332 		{
5333 			pool_t *pool;
5334 			poolid_t poolid;
5335 
5336 			if (pool_lock_intr() != 0) {
5337 				error = EINTR;
5338 				break;
5339 			}
5340 			pool = zone_pool_get(zone);
5341 			poolid = pool->pool_id;
5342 			pool_unlock();
5343 			size = sizeof (poolid);
5344 			if (bufsize > size)
5345 				bufsize = size;
5346 			if (buf != NULL && copyout(&poolid, buf, size) != 0)
5347 				error = EFAULT;
5348 		}
5349 		break;
5350 	case ZONE_ATTR_SLBL:
5351 		size = sizeof (bslabel_t);
5352 		if (bufsize > size)
5353 			bufsize = size;
5354 		if (zone->zone_slabel == NULL)
5355 			error = EINVAL;
5356 		else if (buf != NULL &&
5357 		    copyout(label2bslabel(zone->zone_slabel), buf,
5358 		    bufsize) != 0)
5359 			error = EFAULT;
5360 		break;
5361 	case ZONE_ATTR_INITPID:
5362 		size = sizeof (initpid);
5363 		if (bufsize > size)
5364 			bufsize = size;
5365 		initpid = zone->zone_proc_initpid;
5366 		if (initpid == -1) {
5367 			error = ESRCH;
5368 			break;
5369 		}
5370 		if (buf != NULL &&
5371 		    copyout(&initpid, buf, bufsize) != 0)
5372 			error = EFAULT;
5373 		break;
5374 	case ZONE_ATTR_BRAND:
5375 		size = strlen(zone->zone_brand->b_name) + 1;
5376 
5377 		if (bufsize > size)
5378 			bufsize = size;
5379 		if (buf != NULL) {
5380 			err = copyoutstr(zone->zone_brand->b_name, buf,
5381 			    bufsize, NULL);
5382 			if (err != 0 && err != ENAMETOOLONG)
5383 				error = EFAULT;
5384 		}
5385 		break;
5386 	case ZONE_ATTR_INITNAME:
5387 		size = strlen(zone->zone_initname) + 1;
5388 		if (bufsize > size)
5389 			bufsize = size;
5390 		if (buf != NULL) {
5391 			err = copyoutstr(zone->zone_initname, buf, bufsize,
5392 			    NULL);
5393 			if (err != 0 && err != ENAMETOOLONG)
5394 				error = EFAULT;
5395 		}
5396 		break;
5397 	case ZONE_ATTR_BOOTARGS:
5398 		if (zone->zone_bootargs == NULL)
5399 			outstr = "";
5400 		else
5401 			outstr = zone->zone_bootargs;
5402 		size = strlen(outstr) + 1;
5403 		if (bufsize > size)
5404 			bufsize = size;
5405 		if (buf != NULL) {
5406 			err = copyoutstr(outstr, buf, bufsize, NULL);
5407 			if (err != 0 && err != ENAMETOOLONG)
5408 				error = EFAULT;
5409 		}
5410 		break;
5411 	case ZONE_ATTR_PHYS_MCAP:
5412 		size = sizeof (zone->zone_phys_mcap);
5413 		if (bufsize > size)
5414 			bufsize = size;
5415 		if (buf != NULL &&
5416 		    copyout(&zone->zone_phys_mcap, buf, bufsize) != 0)
5417 			error = EFAULT;
5418 		break;
5419 	case ZONE_ATTR_SCHED_CLASS:
5420 		mutex_enter(&class_lock);
5421 
5422 		if (zone->zone_defaultcid >= loaded_classes)
5423 			outstr = "";
5424 		else
5425 			outstr = sclass[zone->zone_defaultcid].cl_name;
5426 		size = strlen(outstr) + 1;
5427 		if (bufsize > size)
5428 			bufsize = size;
5429 		if (buf != NULL) {
5430 			err = copyoutstr(outstr, buf, bufsize, NULL);
5431 			if (err != 0 && err != ENAMETOOLONG)
5432 				error = EFAULT;
5433 		}
5434 
5435 		mutex_exit(&class_lock);
5436 		break;
5437 	case ZONE_ATTR_HOSTID:
5438 		if (zone->zone_hostid != HW_INVALID_HOSTID &&
5439 		    bufsize == sizeof (zone->zone_hostid)) {
5440 			size = sizeof (zone->zone_hostid);
5441 			if (buf != NULL && copyout(&zone->zone_hostid, buf,
5442 			    bufsize) != 0)
5443 				error = EFAULT;
5444 		} else {
5445 			error = EINVAL;
5446 		}
5447 		break;
5448 	case ZONE_ATTR_FS_ALLOWED:
5449 		if (zone->zone_fs_allowed == NULL)
5450 			outstr = "";
5451 		else
5452 			outstr = zone->zone_fs_allowed;
5453 		size = strlen(outstr) + 1;
5454 		if (bufsize > size)
5455 			bufsize = size;
5456 		if (buf != NULL) {
5457 			err = copyoutstr(outstr, buf, bufsize, NULL);
5458 			if (err != 0 && err != ENAMETOOLONG)
5459 				error = EFAULT;
5460 		}
5461 		break;
5462 	case ZONE_ATTR_NETWORK:
5463 		zbuf = kmem_alloc(bufsize, KM_SLEEP);
5464 		if (copyin(buf, zbuf, bufsize) != 0) {
5465 			error = EFAULT;
5466 		} else {
5467 			error = zone_get_network(zoneid, zbuf);
5468 			if (error == 0 && copyout(zbuf, buf, bufsize) != 0)
5469 				error = EFAULT;
5470 		}
5471 		kmem_free(zbuf, bufsize);
5472 		break;
5473 	default:
5474 		if ((attr >= ZONE_ATTR_BRAND_ATTRS) && ZONE_IS_BRANDED(zone)) {
5475 			size = bufsize;
5476 			error = ZBROP(zone)->b_getattr(zone, attr, buf, &size);
5477 		} else {
5478 			error = EINVAL;
5479 		}
5480 	}
5481 	zone_rele(zone);
5482 
5483 	if (error)
5484 		return (set_errno(error));
5485 	return ((ssize_t)size);
5486 }
5487 
5488 /*
5489  * Systemcall entry point for zone_setattr(2).
5490  */
5491 /*ARGSUSED*/
5492 static int
5493 zone_setattr(zoneid_t zoneid, int attr, void *buf, size_t bufsize)
5494 {
5495 	zone_t *zone;
5496 	zone_status_t zone_status;
5497 	int err = -1;
5498 	zone_net_data_t *zbuf;
5499 
5500 	if (secpolicy_zone_config(CRED()) != 0)
5501 		return (set_errno(EPERM));
5502 
5503 	/*
5504 	 * Only the ZONE_ATTR_PHYS_MCAP attribute can be set on the
5505 	 * global zone.
5506 	 */
5507 	if (zoneid == GLOBAL_ZONEID && attr != ZONE_ATTR_PHYS_MCAP) {
5508 		return (set_errno(EINVAL));
5509 	}
5510 
5511 	mutex_enter(&zonehash_lock);
5512 	if ((zone = zone_find_all_by_id(zoneid)) == NULL) {
5513 		mutex_exit(&zonehash_lock);
5514 		return (set_errno(EINVAL));
5515 	}
5516 	zone_hold(zone);
5517 	mutex_exit(&zonehash_lock);
5518 
5519 	/*
5520 	 * At present most attributes can only be set on non-running,
5521 	 * non-global zones.
5522 	 */
5523 	zone_status = zone_status_get(zone);
5524 	if (attr != ZONE_ATTR_PHYS_MCAP && zone_status > ZONE_IS_READY) {
5525 		err = EINVAL;
5526 		goto done;
5527 	}
5528 
5529 	switch (attr) {
5530 	case ZONE_ATTR_INITNAME:
5531 		err = zone_set_initname(zone, (const char *)buf);
5532 		break;
5533 	case ZONE_ATTR_INITNORESTART:
5534 		zone->zone_restart_init = B_FALSE;
5535 		err = 0;
5536 		break;
5537 	case ZONE_ATTR_BOOTARGS:
5538 		err = zone_set_bootargs(zone, (const char *)buf);
5539 		break;
5540 	case ZONE_ATTR_BRAND:
5541 		err = zone_set_brand(zone, (const char *)buf);
5542 		break;
5543 	case ZONE_ATTR_FS_ALLOWED:
5544 		err = zone_set_fs_allowed(zone, (const char *)buf);
5545 		break;
5546 	case ZONE_ATTR_PHYS_MCAP:
5547 		err = zone_set_phys_mcap(zone, (const uint64_t *)buf);
5548 		break;
5549 	case ZONE_ATTR_SCHED_CLASS:
5550 		err = zone_set_sched_class(zone, (const char *)buf);
5551 		break;
5552 	case ZONE_ATTR_HOSTID:
5553 		if (bufsize == sizeof (zone->zone_hostid)) {
5554 			if (copyin(buf, &zone->zone_hostid, bufsize) == 0)
5555 				err = 0;
5556 			else
5557 				err = EFAULT;
5558 		} else {
5559 			err = EINVAL;
5560 		}
5561 		break;
5562 	case ZONE_ATTR_NETWORK:
5563 		if (bufsize > (PIPE_BUF + sizeof (zone_net_data_t))) {
5564 			err = EINVAL;
5565 			break;
5566 		}
5567 		zbuf = kmem_alloc(bufsize, KM_SLEEP);
5568 		if (copyin(buf, zbuf, bufsize) != 0) {
5569 			kmem_free(zbuf, bufsize);
5570 			err = EFAULT;
5571 			break;
5572 		}
5573 		err = zone_set_network(zoneid, zbuf);
5574 		kmem_free(zbuf, bufsize);
5575 		break;
5576 	default:
5577 		if ((attr >= ZONE_ATTR_BRAND_ATTRS) && ZONE_IS_BRANDED(zone))
5578 			err = ZBROP(zone)->b_setattr(zone, attr, buf, bufsize);
5579 		else
5580 			err = EINVAL;
5581 	}
5582 
5583 done:
5584 	zone_rele(zone);
5585 	ASSERT(err != -1);
5586 	return (err != 0 ? set_errno(err) : 0);
5587 }
5588 
5589 /*
5590  * Return zero if the process has at least one vnode mapped in to its
5591  * address space which shouldn't be allowed to change zones.
5592  *
5593  * Also return zero if the process has any shared mappings which reserve
5594  * swap.  This is because the counting for zone.max-swap does not allow swap
5595  * reservation to be shared between zones.  zone swap reservation is counted
5596  * on zone->zone_max_swap.
5597  */
5598 static int
5599 as_can_change_zones(void)
5600 {
5601 	proc_t *pp = curproc;
5602 	struct seg *seg;
5603 	struct as *as = pp->p_as;
5604 	vnode_t *vp;
5605 	int allow = 1;
5606 
5607 	ASSERT(pp->p_as != &kas);
5608 	AS_LOCK_ENTER(as, RW_READER);
5609 	for (seg = AS_SEGFIRST(as); seg != NULL; seg = AS_SEGNEXT(as, seg)) {
5610 
5611 		/*
5612 		 * Cannot enter zone with shared anon memory which
5613 		 * reserves swap.  See comment above.
5614 		 */
5615 		if (seg_can_change_zones(seg) == B_FALSE) {
5616 			allow = 0;
5617 			break;
5618 		}
5619 		/*
5620 		 * if we can't get a backing vnode for this segment then skip
5621 		 * it.
5622 		 */
5623 		vp = NULL;
5624 		if (SEGOP_GETVP(seg, seg->s_base, &vp) != 0 || vp == NULL)
5625 			continue;
5626 		if (!vn_can_change_zones(vp)) { /* bail on first match */
5627 			allow = 0;
5628 			break;
5629 		}
5630 	}
5631 	AS_LOCK_EXIT(as);
5632 	return (allow);
5633 }
5634 
5635 /*
5636  * Count swap reserved by curproc's address space
5637  */
5638 static size_t
5639 as_swresv(void)
5640 {
5641 	proc_t *pp = curproc;
5642 	struct seg *seg;
5643 	struct as *as = pp->p_as;
5644 	size_t swap = 0;
5645 
5646 	ASSERT(pp->p_as != &kas);
5647 	ASSERT(AS_WRITE_HELD(as));
5648 	for (seg = AS_SEGFIRST(as); seg != NULL; seg = AS_SEGNEXT(as, seg))
5649 		swap += seg_swresv(seg);
5650 
5651 	return (swap);
5652 }
5653 
5654 /*
5655  * Systemcall entry point for zone_enter().
5656  *
5657  * The current process is injected into said zone.  In the process
5658  * it will change its project membership, privileges, rootdir/cwd,
5659  * zone-wide rctls, and pool association to match those of the zone.
5660  *
5661  * The first zone_enter() called while the zone is in the ZONE_IS_READY
5662  * state will transition it to ZONE_IS_RUNNING.  Processes may only
5663  * enter a zone that is "ready" or "running".
5664  */
5665 static int
5666 zone_enter(zoneid_t zoneid)
5667 {
5668 	zone_t *zone;
5669 	vnode_t *vp;
5670 	proc_t *pp = curproc;
5671 	contract_t *ct;
5672 	cont_process_t *ctp;
5673 	task_t *tk, *oldtk;
5674 	kproject_t *zone_proj0;
5675 	cred_t *cr, *newcr;
5676 	pool_t *oldpool, *newpool;
5677 	sess_t *sp;
5678 	uid_t uid;
5679 	zone_status_t status;
5680 	int err = 0;
5681 	rctl_entity_p_t e;
5682 	size_t swap;
5683 	kthread_id_t t;
5684 
5685 	if (secpolicy_zone_config(CRED()) != 0)
5686 		return (set_errno(EPERM));
5687 	if (zoneid < MIN_USERZONEID || zoneid > MAX_ZONEID)
5688 		return (set_errno(EINVAL));
5689 
5690 	/*
5691 	 * Stop all lwps so we don't need to hold a lock to look at
5692 	 * curproc->p_zone.  This needs to happen before we grab any
5693 	 * locks to avoid deadlock (another lwp in the process could
5694 	 * be waiting for the held lock).
5695 	 */
5696 	if (curthread != pp->p_agenttp && !holdlwps(SHOLDFORK))
5697 		return (set_errno(EINTR));
5698 
5699 	/*
5700 	 * Make sure we're not changing zones with files open or mapped in
5701 	 * to our address space which shouldn't be changing zones.
5702 	 */
5703 	if (!files_can_change_zones()) {
5704 		err = EBADF;
5705 		goto out;
5706 	}
5707 	if (!as_can_change_zones()) {
5708 		err = EFAULT;
5709 		goto out;
5710 	}
5711 
5712 	mutex_enter(&zonehash_lock);
5713 	if (pp->p_zone != global_zone) {
5714 		mutex_exit(&zonehash_lock);
5715 		err = EINVAL;
5716 		goto out;
5717 	}
5718 
5719 	zone = zone_find_all_by_id(zoneid);
5720 	if (zone == NULL) {
5721 		mutex_exit(&zonehash_lock);
5722 		err = EINVAL;
5723 		goto out;
5724 	}
5725 
5726 	/*
5727 	 * To prevent processes in a zone from holding contracts on
5728 	 * extrazonal resources, and to avoid process contract
5729 	 * memberships which span zones, contract holders and processes
5730 	 * which aren't the sole members of their encapsulating process
5731 	 * contracts are not allowed to zone_enter.
5732 	 */
5733 	ctp = pp->p_ct_process;
5734 	ct = &ctp->conp_contract;
5735 	mutex_enter(&ct->ct_lock);
5736 	mutex_enter(&pp->p_lock);
5737 	if ((avl_numnodes(&pp->p_ct_held) != 0) || (ctp->conp_nmembers != 1)) {
5738 		mutex_exit(&pp->p_lock);
5739 		mutex_exit(&ct->ct_lock);
5740 		mutex_exit(&zonehash_lock);
5741 		err = EINVAL;
5742 		goto out;
5743 	}
5744 
5745 	/*
5746 	 * Moreover, we don't allow processes whose encapsulating
5747 	 * process contracts have inherited extrazonal contracts.
5748 	 * While it would be easier to eliminate all process contracts
5749 	 * with inherited contracts, we need to be able to give a
5750 	 * restarted init (or other zone-penetrating process) its
5751 	 * predecessor's contracts.
5752 	 */
5753 	if (ctp->conp_ninherited != 0) {
5754 		contract_t *next;
5755 		for (next = list_head(&ctp->conp_inherited); next;
5756 		    next = list_next(&ctp->conp_inherited, next)) {
5757 			if (contract_getzuniqid(next) != zone->zone_uniqid) {
5758 				mutex_exit(&pp->p_lock);
5759 				mutex_exit(&ct->ct_lock);
5760 				mutex_exit(&zonehash_lock);
5761 				err = EINVAL;
5762 				goto out;
5763 			}
5764 		}
5765 	}
5766 
5767 	mutex_exit(&pp->p_lock);
5768 	mutex_exit(&ct->ct_lock);
5769 
5770 	status = zone_status_get(zone);
5771 	if (status < ZONE_IS_READY || status >= ZONE_IS_SHUTTING_DOWN) {
5772 		/*
5773 		 * Can't join
5774 		 */
5775 		mutex_exit(&zonehash_lock);
5776 		err = EINVAL;
5777 		goto out;
5778 	}
5779 
5780 	/*
5781 	 * Make sure new priv set is within the permitted set for caller
5782 	 */
5783 	if (!priv_issubset(zone->zone_privset, &CR_OPPRIV(CRED()))) {
5784 		mutex_exit(&zonehash_lock);
5785 		err = EPERM;
5786 		goto out;
5787 	}
5788 	/*
5789 	 * We want to momentarily drop zonehash_lock while we optimistically
5790 	 * bind curproc to the pool it should be running in.  This is safe
5791 	 * since the zone can't disappear (we have a hold on it).
5792 	 */
5793 	zone_hold(zone);
5794 	mutex_exit(&zonehash_lock);
5795 
5796 	/*
5797 	 * Grab pool_lock to keep the pools configuration from changing
5798 	 * and to stop ourselves from getting rebound to another pool
5799 	 * until we join the zone.
5800 	 */
5801 	if (pool_lock_intr() != 0) {
5802 		zone_rele(zone);
5803 		err = EINTR;
5804 		goto out;
5805 	}
5806 	ASSERT(secpolicy_pool(CRED()) == 0);
5807 	/*
5808 	 * Bind ourselves to the pool currently associated with the zone.
5809 	 */
5810 	oldpool = curproc->p_pool;
5811 	newpool = zone_pool_get(zone);
5812 	if (pool_state == POOL_ENABLED && newpool != oldpool &&
5813 	    (err = pool_do_bind(newpool, P_PID, P_MYID,
5814 	    POOL_BIND_ALL)) != 0) {
5815 		pool_unlock();
5816 		zone_rele(zone);
5817 		goto out;
5818 	}
5819 
5820 	/*
5821 	 * Grab cpu_lock now; we'll need it later when we call
5822 	 * task_join().
5823 	 */
5824 	mutex_enter(&cpu_lock);
5825 	mutex_enter(&zonehash_lock);
5826 	/*
5827 	 * Make sure the zone hasn't moved on since we dropped zonehash_lock.
5828 	 */
5829 	if (zone_status_get(zone) >= ZONE_IS_SHUTTING_DOWN) {
5830 		/*
5831 		 * Can't join anymore.
5832 		 */
5833 		mutex_exit(&zonehash_lock);
5834 		mutex_exit(&cpu_lock);
5835 		if (pool_state == POOL_ENABLED &&
5836 		    newpool != oldpool)
5837 			(void) pool_do_bind(oldpool, P_PID, P_MYID,
5838 			    POOL_BIND_ALL);
5839 		pool_unlock();
5840 		zone_rele(zone);
5841 		err = EINVAL;
5842 		goto out;
5843 	}
5844 
5845 	/*
5846 	 * a_lock must be held while transfering locked memory and swap
5847 	 * reservation from the global zone to the non global zone because
5848 	 * asynchronous faults on the processes' address space can lock
5849 	 * memory and reserve swap via MCL_FUTURE and MAP_NORESERVE
5850 	 * segments respectively.
5851 	 */
5852 	AS_LOCK_ENTER(pp->p_as, RW_WRITER);
5853 	swap = as_swresv();
5854 	mutex_enter(&pp->p_lock);
5855 	zone_proj0 = zone->zone_zsched->p_task->tk_proj;
5856 	/* verify that we do not exceed and task or lwp limits */
5857 	mutex_enter(&zone->zone_nlwps_lock);
5858 	/* add new lwps to zone and zone's proj0 */
5859 	zone_proj0->kpj_nlwps += pp->p_lwpcnt;
5860 	zone->zone_nlwps += pp->p_lwpcnt;
5861 	/* add 1 task to zone's proj0 */
5862 	zone_proj0->kpj_ntasks += 1;
5863 
5864 	zone_proj0->kpj_nprocs++;
5865 	zone->zone_nprocs++;
5866 	mutex_exit(&zone->zone_nlwps_lock);
5867 
5868 	mutex_enter(&zone->zone_mem_lock);
5869 	zone->zone_locked_mem += pp->p_locked_mem;
5870 	zone_proj0->kpj_data.kpd_locked_mem += pp->p_locked_mem;
5871 	zone->zone_max_swap += swap;
5872 	mutex_exit(&zone->zone_mem_lock);
5873 
5874 	mutex_enter(&(zone_proj0->kpj_data.kpd_crypto_lock));
5875 	zone_proj0->kpj_data.kpd_crypto_mem += pp->p_crypto_mem;
5876 	mutex_exit(&(zone_proj0->kpj_data.kpd_crypto_lock));
5877 
5878 	/* remove lwps and process from proc's old zone and old project */
5879 	mutex_enter(&pp->p_zone->zone_nlwps_lock);
5880 	pp->p_zone->zone_nlwps -= pp->p_lwpcnt;
5881 	pp->p_task->tk_proj->kpj_nlwps -= pp->p_lwpcnt;
5882 	pp->p_task->tk_proj->kpj_nprocs--;
5883 	pp->p_zone->zone_nprocs--;
5884 	mutex_exit(&pp->p_zone->zone_nlwps_lock);
5885 
5886 	mutex_enter(&pp->p_zone->zone_mem_lock);
5887 	pp->p_zone->zone_locked_mem -= pp->p_locked_mem;
5888 	pp->p_task->tk_proj->kpj_data.kpd_locked_mem -= pp->p_locked_mem;
5889 	pp->p_zone->zone_max_swap -= swap;
5890 	mutex_exit(&pp->p_zone->zone_mem_lock);
5891 
5892 	mutex_enter(&(pp->p_task->tk_proj->kpj_data.kpd_crypto_lock));
5893 	pp->p_task->tk_proj->kpj_data.kpd_crypto_mem -= pp->p_crypto_mem;
5894 	mutex_exit(&(pp->p_task->tk_proj->kpj_data.kpd_crypto_lock));
5895 
5896 	pp->p_flag |= SZONETOP;
5897 	pp->p_zone = zone;
5898 	mutex_exit(&pp->p_lock);
5899 	AS_LOCK_EXIT(pp->p_as);
5900 
5901 	/*
5902 	 * Joining the zone cannot fail from now on.
5903 	 *
5904 	 * This means that a lot of the following code can be commonized and
5905 	 * shared with zsched().
5906 	 */
5907 
5908 	/*
5909 	 * If the process contract fmri was inherited, we need to
5910 	 * flag this so that any contract status will not leak
5911 	 * extra zone information, svc_fmri in this case
5912 	 */
5913 	if (ctp->conp_svc_ctid != ct->ct_id) {
5914 		mutex_enter(&ct->ct_lock);
5915 		ctp->conp_svc_zone_enter = ct->ct_id;
5916 		mutex_exit(&ct->ct_lock);
5917 	}
5918 
5919 	/*
5920 	 * Reset the encapsulating process contract's zone.
5921 	 */
5922 	ASSERT(ct->ct_mzuniqid == GLOBAL_ZONEUNIQID);
5923 	contract_setzuniqid(ct, zone->zone_uniqid);
5924 
5925 	/*
5926 	 * Create a new task and associate the process with the project keyed
5927 	 * by (projid,zoneid).
5928 	 *
5929 	 * We might as well be in project 0; the global zone's projid doesn't
5930 	 * make much sense in a zone anyhow.
5931 	 *
5932 	 * This also increments zone_ntasks, and returns with p_lock held.
5933 	 */
5934 	tk = task_create(0, zone);
5935 	oldtk = task_join(tk, 0);
5936 	mutex_exit(&cpu_lock);
5937 
5938 	/*
5939 	 * call RCTLOP_SET functions on this proc
5940 	 */
5941 	e.rcep_p.zone = zone;
5942 	e.rcep_t = RCENTITY_ZONE;
5943 	(void) rctl_set_dup(NULL, NULL, pp, &e, zone->zone_rctls, NULL,
5944 	    RCD_CALLBACK);
5945 	mutex_exit(&pp->p_lock);
5946 
5947 	/*
5948 	 * We don't need to hold any of zsched's locks here; not only do we know
5949 	 * the process and zone aren't going away, we know its session isn't
5950 	 * changing either.
5951 	 *
5952 	 * By joining zsched's session here, we mimic the behavior in the
5953 	 * global zone of init's sid being the pid of sched.  We extend this
5954 	 * to all zlogin-like zone_enter()'ing processes as well.
5955 	 */
5956 	mutex_enter(&pidlock);
5957 	sp = zone->zone_zsched->p_sessp;
5958 	sess_hold(zone->zone_zsched);
5959 	mutex_enter(&pp->p_lock);
5960 	pgexit(pp);
5961 	sess_rele(pp->p_sessp, B_TRUE);
5962 	pp->p_sessp = sp;
5963 	pgjoin(pp, zone->zone_zsched->p_pidp);
5964 
5965 	/*
5966 	 * If any threads are scheduled to be placed on zone wait queue they
5967 	 * should abandon the idea since the wait queue is changing.
5968 	 * We need to be holding pidlock & p_lock to do this.
5969 	 */
5970 	if ((t = pp->p_tlist) != NULL) {
5971 		do {
5972 			thread_lock(t);
5973 			/*
5974 			 * Kick this thread so that he doesn't sit
5975 			 * on a wrong wait queue.
5976 			 */
5977 			if (ISWAITING(t))
5978 				setrun_locked(t);
5979 
5980 			if (t->t_schedflag & TS_ANYWAITQ)
5981 				t->t_schedflag &= ~ TS_ANYWAITQ;
5982 
5983 			thread_unlock(t);
5984 		} while ((t = t->t_forw) != pp->p_tlist);
5985 	}
5986 
5987 	/*
5988 	 * If there is a default scheduling class for the zone and it is not
5989 	 * the class we are currently in, change all of the threads in the
5990 	 * process to the new class.  We need to be holding pidlock & p_lock
5991 	 * when we call parmsset so this is a good place to do it.
5992 	 */
5993 	if (zone->zone_defaultcid > 0 &&
5994 	    zone->zone_defaultcid != curthread->t_cid) {
5995 		pcparms_t pcparms;
5996 
5997 		pcparms.pc_cid = zone->zone_defaultcid;
5998 		pcparms.pc_clparms[0] = 0;
5999 
6000 		/*
6001 		 * If setting the class fails, we still want to enter the zone.
6002 		 */
6003 		if ((t = pp->p_tlist) != NULL) {
6004 			do {
6005 				(void) parmsset(&pcparms, t);
6006 			} while ((t = t->t_forw) != pp->p_tlist);
6007 		}
6008 	}
6009 
6010 	mutex_exit(&pp->p_lock);
6011 	mutex_exit(&pidlock);
6012 
6013 	mutex_exit(&zonehash_lock);
6014 	/*
6015 	 * We're firmly in the zone; let pools progress.
6016 	 */
6017 	pool_unlock();
6018 	task_rele(oldtk);
6019 	/*
6020 	 * We don't need to retain a hold on the zone since we already
6021 	 * incremented zone_ntasks, so the zone isn't going anywhere.
6022 	 */
6023 	zone_rele(zone);
6024 
6025 	/*
6026 	 * Chroot
6027 	 */
6028 	vp = zone->zone_rootvp;
6029 	zone_chdir(vp, &PTOU(pp)->u_cdir, pp);
6030 	zone_chdir(vp, &PTOU(pp)->u_rdir, pp);
6031 
6032 	/*
6033 	 * Change process credentials
6034 	 */
6035 	newcr = cralloc();
6036 	mutex_enter(&pp->p_crlock);
6037 	cr = pp->p_cred;
6038 	crcopy_to(cr, newcr);
6039 	crsetzone(newcr, zone);
6040 	pp->p_cred = newcr;
6041 
6042 	/*
6043 	 * Restrict all process privilege sets to zone limit
6044 	 */
6045 	priv_intersect(zone->zone_privset, &CR_PPRIV(newcr));
6046 	priv_intersect(zone->zone_privset, &CR_EPRIV(newcr));
6047 	priv_intersect(zone->zone_privset, &CR_IPRIV(newcr));
6048 	priv_intersect(zone->zone_privset, &CR_LPRIV(newcr));
6049 	mutex_exit(&pp->p_crlock);
6050 	crset(pp, newcr);
6051 
6052 	/*
6053 	 * Adjust upcount to reflect zone entry.
6054 	 */
6055 	uid = crgetruid(newcr);
6056 	mutex_enter(&pidlock);
6057 	upcount_dec(uid, GLOBAL_ZONEID);
6058 	upcount_inc(uid, zoneid);
6059 	mutex_exit(&pidlock);
6060 
6061 	/*
6062 	 * Set up core file path and content.
6063 	 */
6064 	set_core_defaults();
6065 
6066 out:
6067 	/*
6068 	 * Let the other lwps continue.
6069 	 */
6070 	mutex_enter(&pp->p_lock);
6071 	if (curthread != pp->p_agenttp)
6072 		continuelwps(pp);
6073 	mutex_exit(&pp->p_lock);
6074 
6075 	return (err != 0 ? set_errno(err) : 0);
6076 }
6077 
6078 /*
6079  * Systemcall entry point for zone_list(2).
6080  *
6081  * Processes running in a (non-global) zone only see themselves.
6082  * On labeled systems, they see all zones whose label they dominate.
6083  */
6084 static int
6085 zone_list(zoneid_t *zoneidlist, uint_t *numzones)
6086 {
6087 	zoneid_t *zoneids;
6088 	zone_t *zone, *myzone;
6089 	uint_t user_nzones, real_nzones;
6090 	uint_t domi_nzones;
6091 	int error;
6092 
6093 	if (copyin(numzones, &user_nzones, sizeof (uint_t)) != 0)
6094 		return (set_errno(EFAULT));
6095 
6096 	myzone = curproc->p_zone;
6097 	if (myzone != global_zone) {
6098 		bslabel_t *mybslab;
6099 
6100 		if (!is_system_labeled()) {
6101 			/* just return current zone */
6102 			real_nzones = domi_nzones = 1;
6103 			zoneids = kmem_alloc(sizeof (zoneid_t), KM_SLEEP);
6104 			zoneids[0] = myzone->zone_id;
6105 		} else {
6106 			/* return all zones that are dominated */
6107 			mutex_enter(&zonehash_lock);
6108 			real_nzones = zonecount;
6109 			domi_nzones = 0;
6110 			if (real_nzones > 0) {
6111 				zoneids = kmem_alloc(real_nzones *
6112 				    sizeof (zoneid_t), KM_SLEEP);
6113 				mybslab = label2bslabel(myzone->zone_slabel);
6114 				for (zone = list_head(&zone_active);
6115 				    zone != NULL;
6116 				    zone = list_next(&zone_active, zone)) {
6117 					if (zone->zone_id == GLOBAL_ZONEID)
6118 						continue;
6119 					if (zone != myzone &&
6120 					    (zone->zone_flags & ZF_IS_SCRATCH))
6121 						continue;
6122 					/*
6123 					 * Note that a label always dominates
6124 					 * itself, so myzone is always included
6125 					 * in the list.
6126 					 */
6127 					if (bldominates(mybslab,
6128 					    label2bslabel(zone->zone_slabel))) {
6129 						zoneids[domi_nzones++] =
6130 						    zone->zone_id;
6131 					}
6132 				}
6133 			}
6134 			mutex_exit(&zonehash_lock);
6135 		}
6136 	} else {
6137 		mutex_enter(&zonehash_lock);
6138 		real_nzones = zonecount;
6139 		domi_nzones = 0;
6140 		if (real_nzones > 0) {
6141 			zoneids = kmem_alloc(real_nzones * sizeof (zoneid_t),
6142 			    KM_SLEEP);
6143 			for (zone = list_head(&zone_active); zone != NULL;
6144 			    zone = list_next(&zone_active, zone))
6145 				zoneids[domi_nzones++] = zone->zone_id;
6146 			ASSERT(domi_nzones == real_nzones);
6147 		}
6148 		mutex_exit(&zonehash_lock);
6149 	}
6150 
6151 	/*
6152 	 * If user has allocated space for fewer entries than we found, then
6153 	 * return only up to his limit.  Either way, tell him exactly how many
6154 	 * we found.
6155 	 */
6156 	if (domi_nzones < user_nzones)
6157 		user_nzones = domi_nzones;
6158 	error = 0;
6159 	if (copyout(&domi_nzones, numzones, sizeof (uint_t)) != 0) {
6160 		error = EFAULT;
6161 	} else if (zoneidlist != NULL && user_nzones != 0) {
6162 		if (copyout(zoneids, zoneidlist,
6163 		    user_nzones * sizeof (zoneid_t)) != 0)
6164 			error = EFAULT;
6165 	}
6166 
6167 	if (real_nzones > 0)
6168 		kmem_free(zoneids, real_nzones * sizeof (zoneid_t));
6169 
6170 	if (error != 0)
6171 		return (set_errno(error));
6172 	else
6173 		return (0);
6174 }
6175 
6176 /*
6177  * Systemcall entry point for zone_lookup(2).
6178  *
6179  * Non-global zones are only able to see themselves and (on labeled systems)
6180  * the zones they dominate.
6181  */
6182 static zoneid_t
6183 zone_lookup(const char *zone_name)
6184 {
6185 	char *kname;
6186 	zone_t *zone;
6187 	zoneid_t zoneid;
6188 	int err;
6189 
6190 	if (zone_name == NULL) {
6191 		/* return caller's zone id */
6192 		return (getzoneid());
6193 	}
6194 
6195 	kname = kmem_zalloc(ZONENAME_MAX, KM_SLEEP);
6196 	if ((err = copyinstr(zone_name, kname, ZONENAME_MAX, NULL)) != 0) {
6197 		kmem_free(kname, ZONENAME_MAX);
6198 		return (set_errno(err));
6199 	}
6200 
6201 	mutex_enter(&zonehash_lock);
6202 	zone = zone_find_all_by_name(kname);
6203 	kmem_free(kname, ZONENAME_MAX);
6204 	/*
6205 	 * In a non-global zone, can only lookup global and own name.
6206 	 * In Trusted Extensions zone label dominance rules apply.
6207 	 */
6208 	if (zone == NULL ||
6209 	    zone_status_get(zone) < ZONE_IS_READY ||
6210 	    !zone_list_access(zone)) {
6211 		mutex_exit(&zonehash_lock);
6212 		return (set_errno(EINVAL));
6213 	} else {
6214 		zoneid = zone->zone_id;
6215 		mutex_exit(&zonehash_lock);
6216 		return (zoneid);
6217 	}
6218 }
6219 
6220 static int
6221 zone_version(int *version_arg)
6222 {
6223 	int version = ZONE_SYSCALL_API_VERSION;
6224 
6225 	if (copyout(&version, version_arg, sizeof (int)) != 0)
6226 		return (set_errno(EFAULT));
6227 	return (0);
6228 }
6229 
6230 /* ARGSUSED */
6231 long
6232 zone(int cmd, void *arg1, void *arg2, void *arg3, void *arg4)
6233 {
6234 	zone_def zs;
6235 	int err;
6236 
6237 	switch (cmd) {
6238 	case ZONE_CREATE:
6239 		if (get_udatamodel() == DATAMODEL_NATIVE) {
6240 			if (copyin(arg1, &zs, sizeof (zone_def))) {
6241 				return (set_errno(EFAULT));
6242 			}
6243 		} else {
6244 #ifdef _SYSCALL32_IMPL
6245 			zone_def32 zs32;
6246 
6247 			if (copyin(arg1, &zs32, sizeof (zone_def32))) {
6248 				return (set_errno(EFAULT));
6249 			}
6250 			zs.zone_name =
6251 			    (const char *)(unsigned long)zs32.zone_name;
6252 			zs.zone_root =
6253 			    (const char *)(unsigned long)zs32.zone_root;
6254 			zs.zone_privs =
6255 			    (const struct priv_set *)
6256 			    (unsigned long)zs32.zone_privs;
6257 			zs.zone_privssz = zs32.zone_privssz;
6258 			zs.rctlbuf = (caddr_t)(unsigned long)zs32.rctlbuf;
6259 			zs.rctlbufsz = zs32.rctlbufsz;
6260 			zs.zfsbuf = (caddr_t)(unsigned long)zs32.zfsbuf;
6261 			zs.zfsbufsz = zs32.zfsbufsz;
6262 			zs.extended_error =
6263 			    (int *)(unsigned long)zs32.extended_error;
6264 			zs.match = zs32.match;
6265 			zs.doi = zs32.doi;
6266 			zs.label = (const bslabel_t *)(uintptr_t)zs32.label;
6267 			zs.flags = zs32.flags;
6268 #else
6269 			panic("get_udatamodel() returned bogus result\n");
6270 #endif
6271 		}
6272 
6273 		return (zone_create(zs.zone_name, zs.zone_root,
6274 		    zs.zone_privs, zs.zone_privssz,
6275 		    (caddr_t)zs.rctlbuf, zs.rctlbufsz,
6276 		    (caddr_t)zs.zfsbuf, zs.zfsbufsz,
6277 		    zs.extended_error, zs.match, zs.doi,
6278 		    zs.label, zs.flags));
6279 	case ZONE_BOOT:
6280 		return (zone_boot((zoneid_t)(uintptr_t)arg1));
6281 	case ZONE_DESTROY:
6282 		return (zone_destroy((zoneid_t)(uintptr_t)arg1));
6283 	case ZONE_GETATTR:
6284 		return (zone_getattr((zoneid_t)(uintptr_t)arg1,
6285 		    (int)(uintptr_t)arg2, arg3, (size_t)arg4));
6286 	case ZONE_SETATTR:
6287 		return (zone_setattr((zoneid_t)(uintptr_t)arg1,
6288 		    (int)(uintptr_t)arg2, arg3, (size_t)arg4));
6289 	case ZONE_ENTER:
6290 		return (zone_enter((zoneid_t)(uintptr_t)arg1));
6291 	case ZONE_LIST:
6292 		return (zone_list((zoneid_t *)arg1, (uint_t *)arg2));
6293 	case ZONE_SHUTDOWN:
6294 		return (zone_shutdown((zoneid_t)(uintptr_t)arg1));
6295 	case ZONE_LOOKUP:
6296 		return (zone_lookup((const char *)arg1));
6297 	case ZONE_VERSION:
6298 		return (zone_version((int *)arg1));
6299 	case ZONE_ADD_DATALINK:
6300 		return (zone_add_datalink((zoneid_t)(uintptr_t)arg1,
6301 		    (datalink_id_t)(uintptr_t)arg2));
6302 	case ZONE_DEL_DATALINK:
6303 		return (zone_remove_datalink((zoneid_t)(uintptr_t)arg1,
6304 		    (datalink_id_t)(uintptr_t)arg2));
6305 	case ZONE_CHECK_DATALINK: {
6306 		zoneid_t	zoneid;
6307 		boolean_t	need_copyout;
6308 
6309 		if (copyin(arg1, &zoneid, sizeof (zoneid)) != 0)
6310 			return (EFAULT);
6311 		need_copyout = (zoneid == ALL_ZONES);
6312 		err = zone_check_datalink(&zoneid,
6313 		    (datalink_id_t)(uintptr_t)arg2);
6314 		if (err == 0 && need_copyout) {
6315 			if (copyout(&zoneid, arg1, sizeof (zoneid)) != 0)
6316 				err = EFAULT;
6317 		}
6318 		return (err == 0 ? 0 : set_errno(err));
6319 	}
6320 	case ZONE_LIST_DATALINK:
6321 		return (zone_list_datalink((zoneid_t)(uintptr_t)arg1,
6322 		    (int *)arg2, (datalink_id_t *)(uintptr_t)arg3));
6323 	default:
6324 		return (set_errno(EINVAL));
6325 	}
6326 }
6327 
6328 struct zarg {
6329 	zone_t *zone;
6330 	zone_cmd_arg_t arg;
6331 };
6332 
6333 static int
6334 zone_lookup_door(const char *zone_name, door_handle_t *doorp)
6335 {
6336 	char *buf;
6337 	size_t buflen;
6338 	int error;
6339 
6340 	buflen = sizeof (ZONE_DOOR_PATH) + strlen(zone_name);
6341 	buf = kmem_alloc(buflen, KM_SLEEP);
6342 	(void) snprintf(buf, buflen, ZONE_DOOR_PATH, zone_name);
6343 	error = door_ki_open(buf, doorp);
6344 	kmem_free(buf, buflen);
6345 	return (error);
6346 }
6347 
6348 static void
6349 zone_release_door(door_handle_t *doorp)
6350 {
6351 	door_ki_rele(*doorp);
6352 	*doorp = NULL;
6353 }
6354 
6355 static void
6356 zone_ki_call_zoneadmd(struct zarg *zargp)
6357 {
6358 	door_handle_t door = NULL;
6359 	door_arg_t darg, save_arg;
6360 	char *zone_name;
6361 	size_t zone_namelen;
6362 	zoneid_t zoneid;
6363 	zone_t *zone;
6364 	zone_cmd_arg_t arg;
6365 	uint64_t uniqid;
6366 	size_t size;
6367 	int error;
6368 	int retry;
6369 
6370 	zone = zargp->zone;
6371 	arg = zargp->arg;
6372 	kmem_free(zargp, sizeof (*zargp));
6373 
6374 	zone_namelen = strlen(zone->zone_name) + 1;
6375 	zone_name = kmem_alloc(zone_namelen, KM_SLEEP);
6376 	bcopy(zone->zone_name, zone_name, zone_namelen);
6377 	zoneid = zone->zone_id;
6378 	uniqid = zone->zone_uniqid;
6379 	/*
6380 	 * zoneadmd may be down, but at least we can empty out the zone.
6381 	 * We can ignore the return value of zone_empty() since we're called
6382 	 * from a kernel thread and know we won't be delivered any signals.
6383 	 */
6384 	ASSERT(curproc == &p0);
6385 	(void) zone_empty(zone);
6386 	ASSERT(zone_status_get(zone) >= ZONE_IS_EMPTY);
6387 	zone_rele(zone);
6388 
6389 	size = sizeof (arg);
6390 	darg.rbuf = (char *)&arg;
6391 	darg.data_ptr = (char *)&arg;
6392 	darg.rsize = size;
6393 	darg.data_size = size;
6394 	darg.desc_ptr = NULL;
6395 	darg.desc_num = 0;
6396 
6397 	save_arg = darg;
6398 	/*
6399 	 * Since we're not holding a reference to the zone, any number of
6400 	 * things can go wrong, including the zone disappearing before we get a
6401 	 * chance to talk to zoneadmd.
6402 	 */
6403 	for (retry = 0; /* forever */; retry++) {
6404 		if (door == NULL &&
6405 		    (error = zone_lookup_door(zone_name, &door)) != 0) {
6406 			goto next;
6407 		}
6408 		ASSERT(door != NULL);
6409 
6410 		if ((error = door_ki_upcall_limited(door, &darg, NULL,
6411 		    SIZE_MAX, 0)) == 0) {
6412 			break;
6413 		}
6414 		switch (error) {
6415 		case EINTR:
6416 			/* FALLTHROUGH */
6417 		case EAGAIN:	/* process may be forking */
6418 			/*
6419 			 * Back off for a bit
6420 			 */
6421 			break;
6422 		case EBADF:
6423 			zone_release_door(&door);
6424 			if (zone_lookup_door(zone_name, &door) != 0) {
6425 				/*
6426 				 * zoneadmd may be dead, but it may come back to
6427 				 * life later.
6428 				 */
6429 				break;
6430 			}
6431 			break;
6432 		default:
6433 			cmn_err(CE_WARN,
6434 			    "zone_ki_call_zoneadmd: door_ki_upcall error %d\n",
6435 			    error);
6436 			goto out;
6437 		}
6438 next:
6439 		/*
6440 		 * If this isn't the same zone_t that we originally had in mind,
6441 		 * then this is the same as if two kadmin requests come in at
6442 		 * the same time: the first one wins.  This means we lose, so we
6443 		 * bail.
6444 		 */
6445 		if ((zone = zone_find_by_id(zoneid)) == NULL) {
6446 			/*
6447 			 * Problem is solved.
6448 			 */
6449 			break;
6450 		}
6451 		if (zone->zone_uniqid != uniqid) {
6452 			/*
6453 			 * zoneid recycled
6454 			 */
6455 			zone_rele(zone);
6456 			break;
6457 		}
6458 		/*
6459 		 * We could zone_status_timedwait(), but there doesn't seem to
6460 		 * be much point in doing that (plus, it would mean that
6461 		 * zone_free() isn't called until this thread exits).
6462 		 */
6463 		zone_rele(zone);
6464 		delay(hz);
6465 		darg = save_arg;
6466 	}
6467 out:
6468 	if (door != NULL) {
6469 		zone_release_door(&door);
6470 	}
6471 	kmem_free(zone_name, zone_namelen);
6472 	thread_exit();
6473 }
6474 
6475 /*
6476  * Entry point for uadmin() to tell the zone to go away or reboot.  Analog to
6477  * kadmin().  The caller is a process in the zone.
6478  *
6479  * In order to shutdown the zone, we will hand off control to zoneadmd
6480  * (running in the global zone) via a door.  We do a half-hearted job at
6481  * killing all processes in the zone, create a kernel thread to contact
6482  * zoneadmd, and make note of the "uniqid" of the zone.  The uniqid is
6483  * a form of generation number used to let zoneadmd (as well as
6484  * zone_destroy()) know exactly which zone they're re talking about.
6485  */
6486 int
6487 zone_kadmin(int cmd, int fcn, const char *mdep, cred_t *credp)
6488 {
6489 	struct zarg *zargp;
6490 	zone_cmd_t zcmd;
6491 	zone_t *zone;
6492 
6493 	zone = curproc->p_zone;
6494 	ASSERT(getzoneid() != GLOBAL_ZONEID);
6495 
6496 	switch (cmd) {
6497 	case A_SHUTDOWN:
6498 		switch (fcn) {
6499 		case AD_HALT:
6500 		case AD_POWEROFF:
6501 			zcmd = Z_HALT;
6502 			break;
6503 		case AD_BOOT:
6504 			zcmd = Z_REBOOT;
6505 			break;
6506 		case AD_IBOOT:
6507 		case AD_SBOOT:
6508 		case AD_SIBOOT:
6509 		case AD_NOSYNC:
6510 			return (ENOTSUP);
6511 		default:
6512 			return (EINVAL);
6513 		}
6514 		break;
6515 	case A_REBOOT:
6516 		zcmd = Z_REBOOT;
6517 		break;
6518 	case A_FTRACE:
6519 	case A_REMOUNT:
6520 	case A_FREEZE:
6521 	case A_DUMP:
6522 	case A_CONFIG:
6523 		return (ENOTSUP);
6524 	default:
6525 		ASSERT(cmd != A_SWAPCTL);	/* handled by uadmin() */
6526 		return (EINVAL);
6527 	}
6528 
6529 	if (secpolicy_zone_admin(credp, B_FALSE))
6530 		return (EPERM);
6531 	mutex_enter(&zone_status_lock);
6532 
6533 	/*
6534 	 * zone_status can't be ZONE_IS_EMPTY or higher since curproc
6535 	 * is in the zone.
6536 	 */
6537 	ASSERT(zone_status_get(zone) < ZONE_IS_EMPTY);
6538 	if (zone_status_get(zone) > ZONE_IS_RUNNING) {
6539 		/*
6540 		 * This zone is already on its way down.
6541 		 */
6542 		mutex_exit(&zone_status_lock);
6543 		return (0);
6544 	}
6545 	/*
6546 	 * Prevent future zone_enter()s
6547 	 */
6548 	zone_status_set(zone, ZONE_IS_SHUTTING_DOWN);
6549 	mutex_exit(&zone_status_lock);
6550 
6551 	/*
6552 	 * Kill everyone now and call zoneadmd later.
6553 	 * zone_ki_call_zoneadmd() will do a more thorough job of this
6554 	 * later.
6555 	 */
6556 	killall(zone->zone_id);
6557 	/*
6558 	 * Now, create the thread to contact zoneadmd and do the rest of the
6559 	 * work.  This thread can't be created in our zone otherwise
6560 	 * zone_destroy() would deadlock.
6561 	 */
6562 	zargp = kmem_zalloc(sizeof (*zargp), KM_SLEEP);
6563 	zargp->arg.cmd = zcmd;
6564 	zargp->arg.uniqid = zone->zone_uniqid;
6565 	zargp->zone = zone;
6566 	(void) strcpy(zargp->arg.locale, "C");
6567 	/* mdep was already copied in for us by uadmin */
6568 	if (mdep != NULL)
6569 		(void) strlcpy(zargp->arg.bootbuf, mdep,
6570 		    sizeof (zargp->arg.bootbuf));
6571 	zone_hold(zone);
6572 
6573 	(void) thread_create(NULL, 0, zone_ki_call_zoneadmd, zargp, 0, &p0,
6574 	    TS_RUN, minclsyspri);
6575 	exit(CLD_EXITED, 0);
6576 
6577 	return (EINVAL);
6578 }
6579 
6580 /*
6581  * Entry point so kadmin(A_SHUTDOWN, ...) can set the global zone's
6582  * status to ZONE_IS_SHUTTING_DOWN.
6583  *
6584  * This function also shuts down all running zones to ensure that they won't
6585  * fork new processes.
6586  */
6587 void
6588 zone_shutdown_global(void)
6589 {
6590 	zone_t *current_zonep;
6591 
6592 	ASSERT(INGLOBALZONE(curproc));
6593 	mutex_enter(&zonehash_lock);
6594 	mutex_enter(&zone_status_lock);
6595 
6596 	/* Modify the global zone's status first. */
6597 	ASSERT(zone_status_get(global_zone) == ZONE_IS_RUNNING);
6598 	zone_status_set(global_zone, ZONE_IS_SHUTTING_DOWN);
6599 
6600 	/*
6601 	 * Now change the states of all running zones to ZONE_IS_SHUTTING_DOWN.
6602 	 * We don't mark all zones with ZONE_IS_SHUTTING_DOWN because doing so
6603 	 * could cause assertions to fail (e.g., assertions about a zone's
6604 	 * state during initialization, readying, or booting) or produce races.
6605 	 * We'll let threads continue to initialize and ready new zones: they'll
6606 	 * fail to boot the new zones when they see that the global zone is
6607 	 * shutting down.
6608 	 */
6609 	for (current_zonep = list_head(&zone_active); current_zonep != NULL;
6610 	    current_zonep = list_next(&zone_active, current_zonep)) {
6611 		if (zone_status_get(current_zonep) == ZONE_IS_RUNNING)
6612 			zone_status_set(current_zonep, ZONE_IS_SHUTTING_DOWN);
6613 	}
6614 	mutex_exit(&zone_status_lock);
6615 	mutex_exit(&zonehash_lock);
6616 }
6617 
6618 /*
6619  * Returns true if the named dataset is visible in the current zone.
6620  * The 'write' parameter is set to 1 if the dataset is also writable.
6621  */
6622 int
6623 zone_dataset_visible(const char *dataset, int *write)
6624 {
6625 	static int zfstype = -1;
6626 	zone_dataset_t *zd;
6627 	size_t len;
6628 	zone_t *zone = curproc->p_zone;
6629 	const char *name = NULL;
6630 	vfs_t *vfsp = NULL;
6631 
6632 	if (dataset[0] == '\0')
6633 		return (0);
6634 
6635 	/*
6636 	 * Walk the list once, looking for datasets which match exactly, or
6637 	 * specify a dataset underneath an exported dataset.  If found, return
6638 	 * true and note that it is writable.
6639 	 */
6640 	for (zd = list_head(&zone->zone_datasets); zd != NULL;
6641 	    zd = list_next(&zone->zone_datasets, zd)) {
6642 
6643 		len = strlen(zd->zd_dataset);
6644 		if (strlen(dataset) >= len &&
6645 		    bcmp(dataset, zd->zd_dataset, len) == 0 &&
6646 		    (dataset[len] == '\0' || dataset[len] == '/' ||
6647 		    dataset[len] == '@')) {
6648 			if (write)
6649 				*write = 1;
6650 			return (1);
6651 		}
6652 	}
6653 
6654 	/*
6655 	 * Walk the list a second time, searching for datasets which are parents
6656 	 * of exported datasets.  These should be visible, but read-only.
6657 	 *
6658 	 * Note that we also have to support forms such as 'pool/dataset/', with
6659 	 * a trailing slash.
6660 	 */
6661 	for (zd = list_head(&zone->zone_datasets); zd != NULL;
6662 	    zd = list_next(&zone->zone_datasets, zd)) {
6663 
6664 		len = strlen(dataset);
6665 		if (dataset[len - 1] == '/')
6666 			len--;	/* Ignore trailing slash */
6667 		if (len < strlen(zd->zd_dataset) &&
6668 		    bcmp(dataset, zd->zd_dataset, len) == 0 &&
6669 		    zd->zd_dataset[len] == '/') {
6670 			if (write)
6671 				*write = 0;
6672 			return (1);
6673 		}
6674 	}
6675 
6676 	/*
6677 	 * We reach here if the given dataset is not found in the zone_dataset
6678 	 * list. Check if this dataset was added as a filesystem (ie. "add fs")
6679 	 * instead of delegation. For this we search for the dataset in the
6680 	 * zone_vfslist of this zone. If found, return true and note that it is
6681 	 * not writable.
6682 	 */
6683 
6684 	/*
6685 	 * Initialize zfstype if it is not initialized yet.
6686 	 */
6687 	if (zfstype == -1) {
6688 		struct vfssw *vswp = vfs_getvfssw("zfs");
6689 		zfstype = vswp - vfssw;
6690 		vfs_unrefvfssw(vswp);
6691 	}
6692 
6693 	vfs_list_read_lock();
6694 	vfsp = zone->zone_vfslist;
6695 	do {
6696 		ASSERT(vfsp);
6697 		if (vfsp->vfs_fstype == zfstype) {
6698 			name = refstr_value(vfsp->vfs_resource);
6699 
6700 			/*
6701 			 * Check if we have an exact match.
6702 			 */
6703 			if (strcmp(dataset, name) == 0) {
6704 				vfs_list_unlock();
6705 				if (write)
6706 					*write = 0;
6707 				return (1);
6708 			}
6709 			/*
6710 			 * We need to check if we are looking for parents of
6711 			 * a dataset. These should be visible, but read-only.
6712 			 */
6713 			len = strlen(dataset);
6714 			if (dataset[len - 1] == '/')
6715 				len--;
6716 
6717 			if (len < strlen(name) &&
6718 			    bcmp(dataset, name, len) == 0 && name[len] == '/') {
6719 				vfs_list_unlock();
6720 				if (write)
6721 					*write = 0;
6722 				return (1);
6723 			}
6724 		}
6725 		vfsp = vfsp->vfs_zone_next;
6726 	} while (vfsp != zone->zone_vfslist);
6727 
6728 	vfs_list_unlock();
6729 	return (0);
6730 }
6731 
6732 /*
6733  * zone_find_by_any_path() -
6734  *
6735  * kernel-private routine similar to zone_find_by_path(), but which
6736  * effectively compares against zone paths rather than zonerootpath
6737  * (i.e., the last component of zonerootpaths, which should be "root/",
6738  * are not compared.)  This is done in order to accurately identify all
6739  * paths, whether zone-visible or not, including those which are parallel
6740  * to /root/, such as /dev/, /home/, etc...
6741  *
6742  * If the specified path does not fall under any zone path then global
6743  * zone is returned.
6744  *
6745  * The treat_abs parameter indicates whether the path should be treated as
6746  * an absolute path although it does not begin with "/".  (This supports
6747  * nfs mount syntax such as host:any/path.)
6748  *
6749  * The caller is responsible for zone_rele of the returned zone.
6750  */
6751 zone_t *
6752 zone_find_by_any_path(const char *path, boolean_t treat_abs)
6753 {
6754 	zone_t *zone;
6755 	int path_offset = 0;
6756 
6757 	if (path == NULL) {
6758 		zone_hold(global_zone);
6759 		return (global_zone);
6760 	}
6761 
6762 	if (*path != '/') {
6763 		ASSERT(treat_abs);
6764 		path_offset = 1;
6765 	}
6766 
6767 	mutex_enter(&zonehash_lock);
6768 	for (zone = list_head(&zone_active); zone != NULL;
6769 	    zone = list_next(&zone_active, zone)) {
6770 		char	*c;
6771 		size_t	pathlen;
6772 		char *rootpath_start;
6773 
6774 		if (zone == global_zone)	/* skip global zone */
6775 			continue;
6776 
6777 		/* scan backwards to find start of last component */
6778 		c = zone->zone_rootpath + zone->zone_rootpathlen - 2;
6779 		do {
6780 			c--;
6781 		} while (*c != '/');
6782 
6783 		pathlen = c - zone->zone_rootpath + 1 - path_offset;
6784 		rootpath_start = (zone->zone_rootpath + path_offset);
6785 		if (strncmp(path, rootpath_start, pathlen) == 0)
6786 			break;
6787 	}
6788 	if (zone == NULL)
6789 		zone = global_zone;
6790 	zone_hold(zone);
6791 	mutex_exit(&zonehash_lock);
6792 	return (zone);
6793 }
6794 
6795 /*
6796  * Finds a zone_dl_t with the given linkid in the given zone.  Returns the
6797  * zone_dl_t pointer if found, and NULL otherwise.
6798  */
6799 static zone_dl_t *
6800 zone_find_dl(zone_t *zone, datalink_id_t linkid)
6801 {
6802 	zone_dl_t *zdl;
6803 
6804 	ASSERT(mutex_owned(&zone->zone_lock));
6805 	for (zdl = list_head(&zone->zone_dl_list); zdl != NULL;
6806 	    zdl = list_next(&zone->zone_dl_list, zdl)) {
6807 		if (zdl->zdl_id == linkid)
6808 			break;
6809 	}
6810 	return (zdl);
6811 }
6812 
6813 static boolean_t
6814 zone_dl_exists(zone_t *zone, datalink_id_t linkid)
6815 {
6816 	boolean_t exists;
6817 
6818 	mutex_enter(&zone->zone_lock);
6819 	exists = (zone_find_dl(zone, linkid) != NULL);
6820 	mutex_exit(&zone->zone_lock);
6821 	return (exists);
6822 }
6823 
6824 /*
6825  * Add an data link name for the zone.
6826  */
6827 static int
6828 zone_add_datalink(zoneid_t zoneid, datalink_id_t linkid)
6829 {
6830 	zone_dl_t *zdl;
6831 	zone_t *zone;
6832 	zone_t *thiszone;
6833 
6834 	if ((thiszone = zone_find_by_id(zoneid)) == NULL)
6835 		return (set_errno(ENXIO));
6836 
6837 	/* Verify that the datalink ID doesn't already belong to a zone. */
6838 	mutex_enter(&zonehash_lock);
6839 	for (zone = list_head(&zone_active); zone != NULL;
6840 	    zone = list_next(&zone_active, zone)) {
6841 		if (zone_dl_exists(zone, linkid)) {
6842 			mutex_exit(&zonehash_lock);
6843 			zone_rele(thiszone);
6844 			return (set_errno((zone == thiszone) ? EEXIST : EPERM));
6845 		}
6846 	}
6847 
6848 	zdl = kmem_zalloc(sizeof (*zdl), KM_SLEEP);
6849 	zdl->zdl_id = linkid;
6850 	zdl->zdl_net = NULL;
6851 	mutex_enter(&thiszone->zone_lock);
6852 	list_insert_head(&thiszone->zone_dl_list, zdl);
6853 	mutex_exit(&thiszone->zone_lock);
6854 	mutex_exit(&zonehash_lock);
6855 	zone_rele(thiszone);
6856 	return (0);
6857 }
6858 
6859 static int
6860 zone_remove_datalink(zoneid_t zoneid, datalink_id_t linkid)
6861 {
6862 	zone_dl_t *zdl;
6863 	zone_t *zone;
6864 	int err = 0;
6865 
6866 	if ((zone = zone_find_by_id(zoneid)) == NULL)
6867 		return (set_errno(EINVAL));
6868 
6869 	mutex_enter(&zone->zone_lock);
6870 	if ((zdl = zone_find_dl(zone, linkid)) == NULL) {
6871 		err = ENXIO;
6872 	} else {
6873 		list_remove(&zone->zone_dl_list, zdl);
6874 		nvlist_free(zdl->zdl_net);
6875 		kmem_free(zdl, sizeof (zone_dl_t));
6876 	}
6877 	mutex_exit(&zone->zone_lock);
6878 	zone_rele(zone);
6879 	return (err == 0 ? 0 : set_errno(err));
6880 }
6881 
6882 /*
6883  * Using the zoneidp as ALL_ZONES, we can lookup which zone has been assigned
6884  * the linkid.  Otherwise we just check if the specified zoneidp has been
6885  * assigned the supplied linkid.
6886  */
6887 int
6888 zone_check_datalink(zoneid_t *zoneidp, datalink_id_t linkid)
6889 {
6890 	zone_t *zone;
6891 	int err = ENXIO;
6892 
6893 	if (*zoneidp != ALL_ZONES) {
6894 		if ((zone = zone_find_by_id(*zoneidp)) != NULL) {
6895 			if (zone_dl_exists(zone, linkid))
6896 				err = 0;
6897 			zone_rele(zone);
6898 		}
6899 		return (err);
6900 	}
6901 
6902 	mutex_enter(&zonehash_lock);
6903 	for (zone = list_head(&zone_active); zone != NULL;
6904 	    zone = list_next(&zone_active, zone)) {
6905 		if (zone_dl_exists(zone, linkid)) {
6906 			*zoneidp = zone->zone_id;
6907 			err = 0;
6908 			break;
6909 		}
6910 	}
6911 	mutex_exit(&zonehash_lock);
6912 	return (err);
6913 }
6914 
6915 /*
6916  * Get the list of datalink IDs assigned to a zone.
6917  *
6918  * On input, *nump is the number of datalink IDs that can fit in the supplied
6919  * idarray.  Upon return, *nump is either set to the number of datalink IDs
6920  * that were placed in the array if the array was large enough, or to the
6921  * number of datalink IDs that the function needs to place in the array if the
6922  * array is too small.
6923  */
6924 static int
6925 zone_list_datalink(zoneid_t zoneid, int *nump, datalink_id_t *idarray)
6926 {
6927 	uint_t num, dlcount;
6928 	zone_t *zone;
6929 	zone_dl_t *zdl;
6930 	datalink_id_t *idptr = idarray;
6931 
6932 	if (copyin(nump, &dlcount, sizeof (dlcount)) != 0)
6933 		return (set_errno(EFAULT));
6934 	if ((zone = zone_find_by_id(zoneid)) == NULL)
6935 		return (set_errno(ENXIO));
6936 
6937 	num = 0;
6938 	mutex_enter(&zone->zone_lock);
6939 	for (zdl = list_head(&zone->zone_dl_list); zdl != NULL;
6940 	    zdl = list_next(&zone->zone_dl_list, zdl)) {
6941 		/*
6942 		 * If the list is bigger than what the caller supplied, just
6943 		 * count, don't do copyout.
6944 		 */
6945 		if (++num > dlcount)
6946 			continue;
6947 		if (copyout(&zdl->zdl_id, idptr, sizeof (*idptr)) != 0) {
6948 			mutex_exit(&zone->zone_lock);
6949 			zone_rele(zone);
6950 			return (set_errno(EFAULT));
6951 		}
6952 		idptr++;
6953 	}
6954 	mutex_exit(&zone->zone_lock);
6955 	zone_rele(zone);
6956 
6957 	/* Increased or decreased, caller should be notified. */
6958 	if (num != dlcount) {
6959 		if (copyout(&num, nump, sizeof (num)) != 0)
6960 			return (set_errno(EFAULT));
6961 	}
6962 	return (0);
6963 }
6964 
6965 /*
6966  * Public interface for looking up a zone by zoneid. It's a customized version
6967  * for netstack_zone_create(). It can only be called from the zsd create
6968  * callbacks, since it doesn't have reference on the zone structure hence if
6969  * it is called elsewhere the zone could disappear after the zonehash_lock
6970  * is dropped.
6971  *
6972  * Furthermore it
6973  * 1. Doesn't check the status of the zone.
6974  * 2. It will be called even before zone_init is called, in that case the
6975  *    address of zone0 is returned directly, and netstack_zone_create()
6976  *    will only assign a value to zone0.zone_netstack, won't break anything.
6977  * 3. Returns without the zone being held.
6978  */
6979 zone_t *
6980 zone_find_by_id_nolock(zoneid_t zoneid)
6981 {
6982 	zone_t *zone;
6983 
6984 	mutex_enter(&zonehash_lock);
6985 	if (zonehashbyid == NULL)
6986 		zone = &zone0;
6987 	else
6988 		zone = zone_find_all_by_id(zoneid);
6989 	mutex_exit(&zonehash_lock);
6990 	return (zone);
6991 }
6992 
6993 /*
6994  * Walk the datalinks for a given zone
6995  */
6996 int
6997 zone_datalink_walk(zoneid_t zoneid, int (*cb)(datalink_id_t, void *),
6998     void *data)
6999 {
7000 	zone_t		*zone;
7001 	zone_dl_t	*zdl;
7002 	datalink_id_t	*idarray;
7003 	uint_t		idcount = 0;
7004 	int		i, ret = 0;
7005 
7006 	if ((zone = zone_find_by_id(zoneid)) == NULL)
7007 		return (ENOENT);
7008 
7009 	/*
7010 	 * We first build an array of linkid's so that we can walk these and
7011 	 * execute the callback with the zone_lock dropped.
7012 	 */
7013 	mutex_enter(&zone->zone_lock);
7014 	for (zdl = list_head(&zone->zone_dl_list); zdl != NULL;
7015 	    zdl = list_next(&zone->zone_dl_list, zdl)) {
7016 		idcount++;
7017 	}
7018 
7019 	if (idcount == 0) {
7020 		mutex_exit(&zone->zone_lock);
7021 		zone_rele(zone);
7022 		return (0);
7023 	}
7024 
7025 	idarray = kmem_alloc(sizeof (datalink_id_t) * idcount, KM_NOSLEEP);
7026 	if (idarray == NULL) {
7027 		mutex_exit(&zone->zone_lock);
7028 		zone_rele(zone);
7029 		return (ENOMEM);
7030 	}
7031 
7032 	for (i = 0, zdl = list_head(&zone->zone_dl_list); zdl != NULL;
7033 	    i++, zdl = list_next(&zone->zone_dl_list, zdl)) {
7034 		idarray[i] = zdl->zdl_id;
7035 	}
7036 
7037 	mutex_exit(&zone->zone_lock);
7038 
7039 	for (i = 0; i < idcount && ret == 0; i++) {
7040 		if ((ret = (*cb)(idarray[i], data)) != 0)
7041 			break;
7042 	}
7043 
7044 	zone_rele(zone);
7045 	kmem_free(idarray, sizeof (datalink_id_t) * idcount);
7046 	return (ret);
7047 }
7048 
7049 static char *
7050 zone_net_type2name(int type)
7051 {
7052 	switch (type) {
7053 	case ZONE_NETWORK_ADDRESS:
7054 		return (ZONE_NET_ADDRNAME);
7055 	case ZONE_NETWORK_DEFROUTER:
7056 		return (ZONE_NET_RTRNAME);
7057 	default:
7058 		return (NULL);
7059 	}
7060 }
7061 
7062 static int
7063 zone_set_network(zoneid_t zoneid, zone_net_data_t *znbuf)
7064 {
7065 	zone_t *zone;
7066 	zone_dl_t *zdl;
7067 	nvlist_t *nvl;
7068 	int err = 0;
7069 	uint8_t *new = NULL;
7070 	char *nvname;
7071 	int bufsize;
7072 	datalink_id_t linkid = znbuf->zn_linkid;
7073 
7074 	if (secpolicy_zone_config(CRED()) != 0)
7075 		return (set_errno(EPERM));
7076 
7077 	if (zoneid == GLOBAL_ZONEID)
7078 		return (set_errno(EINVAL));
7079 
7080 	nvname = zone_net_type2name(znbuf->zn_type);
7081 	bufsize = znbuf->zn_len;
7082 	new = znbuf->zn_val;
7083 	if (nvname == NULL)
7084 		return (set_errno(EINVAL));
7085 
7086 	if ((zone = zone_find_by_id(zoneid)) == NULL) {
7087 		return (set_errno(EINVAL));
7088 	}
7089 
7090 	mutex_enter(&zone->zone_lock);
7091 	if ((zdl = zone_find_dl(zone, linkid)) == NULL) {
7092 		err = ENXIO;
7093 		goto done;
7094 	}
7095 	if ((nvl = zdl->zdl_net) == NULL) {
7096 		if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP)) {
7097 			err = ENOMEM;
7098 			goto done;
7099 		} else {
7100 			zdl->zdl_net = nvl;
7101 		}
7102 	}
7103 	if (nvlist_exists(nvl, nvname)) {
7104 		err = EINVAL;
7105 		goto done;
7106 	}
7107 	err = nvlist_add_uint8_array(nvl, nvname, new, bufsize);
7108 	ASSERT(err == 0);
7109 done:
7110 	mutex_exit(&zone->zone_lock);
7111 	zone_rele(zone);
7112 	if (err != 0)
7113 		return (set_errno(err));
7114 	else
7115 		return (0);
7116 }
7117 
7118 static int
7119 zone_get_network(zoneid_t zoneid, zone_net_data_t *znbuf)
7120 {
7121 	zone_t *zone;
7122 	zone_dl_t *zdl;
7123 	nvlist_t *nvl;
7124 	uint8_t *ptr;
7125 	uint_t psize;
7126 	int err = 0;
7127 	char *nvname;
7128 	int bufsize;
7129 	void *buf;
7130 	datalink_id_t linkid = znbuf->zn_linkid;
7131 
7132 	if (zoneid == GLOBAL_ZONEID)
7133 		return (set_errno(EINVAL));
7134 
7135 	nvname = zone_net_type2name(znbuf->zn_type);
7136 	bufsize = znbuf->zn_len;
7137 	buf = znbuf->zn_val;
7138 
7139 	if (nvname == NULL)
7140 		return (set_errno(EINVAL));
7141 	if ((zone = zone_find_by_id(zoneid)) == NULL)
7142 		return (set_errno(EINVAL));
7143 
7144 	mutex_enter(&zone->zone_lock);
7145 	if ((zdl = zone_find_dl(zone, linkid)) == NULL) {
7146 		err = ENXIO;
7147 		goto done;
7148 	}
7149 	if ((nvl = zdl->zdl_net) == NULL || !nvlist_exists(nvl, nvname)) {
7150 		err = ENOENT;
7151 		goto done;
7152 	}
7153 	err = nvlist_lookup_uint8_array(nvl, nvname, &ptr, &psize);
7154 	ASSERT(err == 0);
7155 
7156 	if (psize > bufsize) {
7157 		err = ENOBUFS;
7158 		goto done;
7159 	}
7160 	znbuf->zn_len = psize;
7161 	bcopy(ptr, buf, psize);
7162 done:
7163 	mutex_exit(&zone->zone_lock);
7164 	zone_rele(zone);
7165 	if (err != 0)
7166 		return (set_errno(err));
7167 	else
7168 		return (0);
7169 }
7170