1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <sys/cdefs.h>
38 #include "opt_capsicum.h"
39 #include "opt_ktrace.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #ifdef COMPAT_FREEBSD11
44 #include <sys/abi_compat.h>
45 #endif
46 #include <sys/bio.h>
47 #include <sys/buf.h>
48 #include <sys/capsicum.h>
49 #include <sys/disk.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
52 #include <sys/mutex.h>
53 #include <sys/sysproto.h>
54 #include <sys/namei.h>
55 #include <sys/filedesc.h>
56 #include <sys/kernel.h>
57 #include <sys/fcntl.h>
58 #include <sys/file.h>
59 #include <sys/filio.h>
60 #include <sys/limits.h>
61 #include <sys/linker.h>
62 #include <sys/rwlock.h>
63 #include <sys/sdt.h>
64 #include <sys/stat.h>
65 #include <sys/sx.h>
66 #include <sys/unistd.h>
67 #include <sys/vnode.h>
68 #include <sys/priv.h>
69 #include <sys/proc.h>
70 #include <sys/dirent.h>
71 #include <sys/jail.h>
72 #include <sys/syscallsubr.h>
73 #include <sys/sysctl.h>
74 #ifdef KTRACE
75 #include <sys/ktrace.h>
76 #endif
77
78 #include <machine/stdarg.h>
79
80 #include <security/audit/audit.h>
81 #include <security/mac/mac_framework.h>
82
83 #include <vm/vm.h>
84 #include <vm/vm_object.h>
85 #include <vm/vm_page.h>
86 #include <vm/vnode_pager.h>
87 #include <vm/uma.h>
88
89 #include <fs/devfs/devfs.h>
90
91 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
92
93 static int kern_chflagsat(struct thread *td, int fd, const char *path,
94 enum uio_seg pathseg, u_long flags, int atflag);
95 static int setfflags(struct thread *td, struct vnode *, u_long);
96 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
97 static int getutimens(const struct timespec *, enum uio_seg,
98 struct timespec *, int *);
99 static int setutimes(struct thread *td, struct vnode *,
100 const struct timespec *, int, int);
101 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
102 struct thread *td);
103 static int kern_fhlinkat(struct thread *td, int fd, const char *path,
104 enum uio_seg pathseg, fhandle_t *fhp);
105 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg,
106 size_t count, struct thread *td);
107 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd,
108 const char *path, enum uio_seg segflag);
109
110 uint64_t
at2cnpflags(u_int at_flags,u_int mask)111 at2cnpflags(u_int at_flags, u_int mask)
112 {
113 uint64_t res;
114
115 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) !=
116 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW));
117
118 res = 0;
119 at_flags &= mask;
120 if ((at_flags & AT_RESOLVE_BENEATH) != 0)
121 res |= RBENEATH;
122 if ((at_flags & AT_SYMLINK_FOLLOW) != 0)
123 res |= FOLLOW;
124 /* NOFOLLOW is pseudo flag */
125 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) {
126 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW :
127 FOLLOW;
128 }
129 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0)
130 res |= EMPTYPATH;
131 return (res);
132 }
133
134 int
kern_sync(struct thread * td)135 kern_sync(struct thread *td)
136 {
137 struct mount *mp, *nmp;
138 int save;
139
140 mtx_lock(&mountlist_mtx);
141 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
142 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
143 nmp = TAILQ_NEXT(mp, mnt_list);
144 continue;
145 }
146 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
147 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
148 save = curthread_pflags_set(TDP_SYNCIO);
149 vfs_periodic(mp, MNT_NOWAIT);
150 VFS_SYNC(mp, MNT_NOWAIT);
151 curthread_pflags_restore(save);
152 vn_finished_write(mp);
153 }
154 mtx_lock(&mountlist_mtx);
155 nmp = TAILQ_NEXT(mp, mnt_list);
156 vfs_unbusy(mp);
157 }
158 mtx_unlock(&mountlist_mtx);
159 return (0);
160 }
161
162 /*
163 * Sync each mounted filesystem.
164 */
165 #ifndef _SYS_SYSPROTO_H_
166 struct sync_args {
167 int dummy;
168 };
169 #endif
170 /* ARGSUSED */
171 int
sys_sync(struct thread * td,struct sync_args * uap)172 sys_sync(struct thread *td, struct sync_args *uap)
173 {
174
175 return (kern_sync(td));
176 }
177
178 /*
179 * Change filesystem quotas.
180 */
181 #ifndef _SYS_SYSPROTO_H_
182 struct quotactl_args {
183 char *path;
184 int cmd;
185 int uid;
186 caddr_t arg;
187 };
188 #endif
189 int
sys_quotactl(struct thread * td,struct quotactl_args * uap)190 sys_quotactl(struct thread *td, struct quotactl_args *uap)
191 {
192 struct mount *mp;
193 struct nameidata nd;
194 int error;
195 bool mp_busy;
196
197 AUDIT_ARG_CMD(uap->cmd);
198 AUDIT_ARG_UID(uap->uid);
199 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
200 return (EPERM);
201 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
202 uap->path);
203 if ((error = namei(&nd)) != 0)
204 return (error);
205 NDFREE_PNBUF(&nd);
206 mp = nd.ni_vp->v_mount;
207 vfs_ref(mp);
208 vput(nd.ni_vp);
209 error = vfs_busy(mp, 0);
210 if (error != 0) {
211 vfs_rel(mp);
212 return (error);
213 }
214 mp_busy = true;
215 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy);
216
217 /*
218 * Since quota on/off operations typically need to open quota
219 * files, the implementation may need to unbusy the mount point
220 * before calling into namei. Otherwise, unmount might be
221 * started between two vfs_busy() invocations (first is ours,
222 * second is from mount point cross-walk code in lookup()),
223 * causing deadlock.
224 *
225 * Avoid unbusying mp if the implementation indicates it has
226 * already done so.
227 */
228 if (mp_busy)
229 vfs_unbusy(mp);
230 vfs_rel(mp);
231 return (error);
232 }
233
234 /*
235 * Used by statfs conversion routines to scale the block size up if
236 * necessary so that all of the block counts are <= 'max_size'. Note
237 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
238 * value of 'n'.
239 */
240 void
statfs_scale_blocks(struct statfs * sf,long max_size)241 statfs_scale_blocks(struct statfs *sf, long max_size)
242 {
243 uint64_t count;
244 int shift;
245
246 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
247
248 /*
249 * Attempt to scale the block counts to give a more accurate
250 * overview to userland of the ratio of free space to used
251 * space. To do this, find the largest block count and compute
252 * a divisor that lets it fit into a signed integer <= max_size.
253 */
254 if (sf->f_bavail < 0)
255 count = -sf->f_bavail;
256 else
257 count = sf->f_bavail;
258 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
259 if (count <= max_size)
260 return;
261
262 count >>= flsl(max_size);
263 shift = 0;
264 while (count > 0) {
265 shift++;
266 count >>=1;
267 }
268
269 sf->f_bsize <<= shift;
270 sf->f_blocks >>= shift;
271 sf->f_bfree >>= shift;
272 sf->f_bavail >>= shift;
273 }
274
275 static int
kern_do_statfs(struct thread * td,struct mount * mp,struct statfs * buf)276 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
277 {
278 int error;
279
280 if (mp == NULL)
281 return (EBADF);
282 error = vfs_busy(mp, 0);
283 vfs_rel(mp);
284 if (error != 0)
285 return (error);
286 #ifdef MAC
287 error = mac_mount_check_stat(td->td_ucred, mp);
288 if (error != 0)
289 goto out;
290 #endif
291 error = VFS_STATFS(mp, buf);
292 if (error != 0)
293 goto out;
294 if (priv_check_cred_vfs_generation(td->td_ucred)) {
295 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
296 prison_enforce_statfs(td->td_ucred, mp, buf);
297 }
298 out:
299 vfs_unbusy(mp);
300 return (error);
301 }
302
303 /*
304 * Get filesystem statistics.
305 */
306 #ifndef _SYS_SYSPROTO_H_
307 struct statfs_args {
308 char *path;
309 struct statfs *buf;
310 };
311 #endif
312 int
sys_statfs(struct thread * td,struct statfs_args * uap)313 sys_statfs(struct thread *td, struct statfs_args *uap)
314 {
315 struct statfs *sfp;
316 int error;
317
318 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
319 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
320 if (error == 0)
321 error = copyout(sfp, uap->buf, sizeof(struct statfs));
322 free(sfp, M_STATFS);
323 return (error);
324 }
325
326 int
kern_statfs(struct thread * td,const char * path,enum uio_seg pathseg,struct statfs * buf)327 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg,
328 struct statfs *buf)
329 {
330 struct mount *mp;
331 struct nameidata nd;
332 int error;
333
334 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path);
335 error = namei(&nd);
336 if (error != 0)
337 return (error);
338 NDFREE_PNBUF(&nd);
339 mp = vfs_ref_from_vp(nd.ni_vp);
340 vrele(nd.ni_vp);
341 return (kern_do_statfs(td, mp, buf));
342 }
343
344 /*
345 * Get filesystem statistics.
346 */
347 #ifndef _SYS_SYSPROTO_H_
348 struct fstatfs_args {
349 int fd;
350 struct statfs *buf;
351 };
352 #endif
353 int
sys_fstatfs(struct thread * td,struct fstatfs_args * uap)354 sys_fstatfs(struct thread *td, struct fstatfs_args *uap)
355 {
356 struct statfs *sfp;
357 int error;
358
359 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
360 error = kern_fstatfs(td, uap->fd, sfp);
361 if (error == 0)
362 error = copyout(sfp, uap->buf, sizeof(struct statfs));
363 free(sfp, M_STATFS);
364 return (error);
365 }
366
367 int
kern_fstatfs(struct thread * td,int fd,struct statfs * buf)368 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
369 {
370 struct file *fp;
371 struct mount *mp;
372 struct vnode *vp;
373 int error;
374
375 AUDIT_ARG_FD(fd);
376 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp);
377 if (error != 0)
378 return (error);
379 vp = fp->f_vnode;
380 #ifdef AUDIT
381 if (AUDITING_TD(td)) {
382 vn_lock(vp, LK_SHARED | LK_RETRY);
383 AUDIT_ARG_VNODE1(vp);
384 VOP_UNLOCK(vp);
385 }
386 #endif
387 mp = vfs_ref_from_vp(vp);
388 fdrop(fp, td);
389 return (kern_do_statfs(td, mp, buf));
390 }
391
392 /*
393 * Get statistics on all filesystems.
394 */
395 #ifndef _SYS_SYSPROTO_H_
396 struct getfsstat_args {
397 struct statfs *buf;
398 long bufsize;
399 int mode;
400 };
401 #endif
402 int
sys_getfsstat(struct thread * td,struct getfsstat_args * uap)403 sys_getfsstat(struct thread *td, struct getfsstat_args *uap)
404 {
405 size_t count;
406 int error;
407
408 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX)
409 return (EINVAL);
410 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count,
411 UIO_USERSPACE, uap->mode);
412 if (error == 0)
413 td->td_retval[0] = count;
414 return (error);
415 }
416
417 /*
418 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
419 * The caller is responsible for freeing memory which will be allocated
420 * in '*buf'.
421 */
422 int
kern_getfsstat(struct thread * td,struct statfs ** buf,size_t bufsize,size_t * countp,enum uio_seg bufseg,int mode)423 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
424 size_t *countp, enum uio_seg bufseg, int mode)
425 {
426 struct mount *mp, *nmp;
427 struct statfs *sfsp, *sp, *sptmp, *tofree;
428 size_t count, maxcount;
429 int error;
430
431 switch (mode) {
432 case MNT_WAIT:
433 case MNT_NOWAIT:
434 break;
435 default:
436 if (bufseg == UIO_SYSSPACE)
437 *buf = NULL;
438 return (EINVAL);
439 }
440 restart:
441 maxcount = bufsize / sizeof(struct statfs);
442 if (bufsize == 0) {
443 sfsp = NULL;
444 tofree = NULL;
445 } else if (bufseg == UIO_USERSPACE) {
446 sfsp = *buf;
447 tofree = NULL;
448 } else /* if (bufseg == UIO_SYSSPACE) */ {
449 count = 0;
450 mtx_lock(&mountlist_mtx);
451 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
452 count++;
453 }
454 mtx_unlock(&mountlist_mtx);
455 if (maxcount > count)
456 maxcount = count;
457 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs),
458 M_STATFS, M_WAITOK);
459 }
460
461 count = 0;
462
463 /*
464 * If there is no target buffer they only want the count.
465 *
466 * This could be TAILQ_FOREACH but it is open-coded to match the original
467 * code below.
468 */
469 if (sfsp == NULL) {
470 mtx_lock(&mountlist_mtx);
471 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
472 if (prison_canseemount(td->td_ucred, mp) != 0) {
473 nmp = TAILQ_NEXT(mp, mnt_list);
474 continue;
475 }
476 #ifdef MAC
477 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
478 nmp = TAILQ_NEXT(mp, mnt_list);
479 continue;
480 }
481 #endif
482 count++;
483 nmp = TAILQ_NEXT(mp, mnt_list);
484 }
485 mtx_unlock(&mountlist_mtx);
486 *countp = count;
487 return (0);
488 }
489
490 /*
491 * They want the entire thing.
492 *
493 * Short-circuit the corner case of no room for anything, avoids
494 * relocking below.
495 */
496 if (maxcount < 1) {
497 goto out;
498 }
499
500 mtx_lock(&mountlist_mtx);
501 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
502 if (prison_canseemount(td->td_ucred, mp) != 0) {
503 nmp = TAILQ_NEXT(mp, mnt_list);
504 continue;
505 }
506 #ifdef MAC
507 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
508 nmp = TAILQ_NEXT(mp, mnt_list);
509 continue;
510 }
511 #endif
512 if (mode == MNT_WAIT) {
513 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) {
514 /*
515 * If vfs_busy() failed, and MBF_NOWAIT
516 * wasn't passed, then the mp is gone.
517 * Furthermore, because of MBF_MNTLSTLOCK,
518 * the mountlist_mtx was dropped. We have
519 * no other choice than to start over.
520 */
521 mtx_unlock(&mountlist_mtx);
522 free(tofree, M_STATFS);
523 goto restart;
524 }
525 } else {
526 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
527 nmp = TAILQ_NEXT(mp, mnt_list);
528 continue;
529 }
530 }
531 sp = &mp->mnt_stat;
532 /*
533 * If MNT_NOWAIT is specified, do not refresh
534 * the fsstat cache.
535 */
536 if (mode != MNT_NOWAIT) {
537 error = VFS_STATFS(mp, sp);
538 if (error != 0) {
539 mtx_lock(&mountlist_mtx);
540 nmp = TAILQ_NEXT(mp, mnt_list);
541 vfs_unbusy(mp);
542 continue;
543 }
544 }
545 if (priv_check_cred_vfs_generation(td->td_ucred)) {
546 sptmp = malloc(sizeof(struct statfs), M_STATFS,
547 M_WAITOK);
548 *sptmp = *sp;
549 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0;
550 prison_enforce_statfs(td->td_ucred, mp, sptmp);
551 sp = sptmp;
552 } else
553 sptmp = NULL;
554 if (bufseg == UIO_SYSSPACE) {
555 bcopy(sp, sfsp, sizeof(*sp));
556 free(sptmp, M_STATFS);
557 } else /* if (bufseg == UIO_USERSPACE) */ {
558 error = copyout(sp, sfsp, sizeof(*sp));
559 free(sptmp, M_STATFS);
560 if (error != 0) {
561 vfs_unbusy(mp);
562 return (error);
563 }
564 }
565 sfsp++;
566 count++;
567
568 if (count == maxcount) {
569 vfs_unbusy(mp);
570 goto out;
571 }
572
573 mtx_lock(&mountlist_mtx);
574 nmp = TAILQ_NEXT(mp, mnt_list);
575 vfs_unbusy(mp);
576 }
577 mtx_unlock(&mountlist_mtx);
578 out:
579 *countp = count;
580 return (0);
581 }
582
583 #ifdef COMPAT_FREEBSD4
584 /*
585 * Get old format filesystem statistics.
586 */
587 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *);
588
589 #ifndef _SYS_SYSPROTO_H_
590 struct freebsd4_statfs_args {
591 char *path;
592 struct ostatfs *buf;
593 };
594 #endif
595 int
freebsd4_statfs(struct thread * td,struct freebsd4_statfs_args * uap)596 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap)
597 {
598 struct ostatfs osb;
599 struct statfs *sfp;
600 int error;
601
602 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
603 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
604 if (error == 0) {
605 freebsd4_cvtstatfs(sfp, &osb);
606 error = copyout(&osb, uap->buf, sizeof(osb));
607 }
608 free(sfp, M_STATFS);
609 return (error);
610 }
611
612 /*
613 * Get filesystem statistics.
614 */
615 #ifndef _SYS_SYSPROTO_H_
616 struct freebsd4_fstatfs_args {
617 int fd;
618 struct ostatfs *buf;
619 };
620 #endif
621 int
freebsd4_fstatfs(struct thread * td,struct freebsd4_fstatfs_args * uap)622 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap)
623 {
624 struct ostatfs osb;
625 struct statfs *sfp;
626 int error;
627
628 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
629 error = kern_fstatfs(td, uap->fd, sfp);
630 if (error == 0) {
631 freebsd4_cvtstatfs(sfp, &osb);
632 error = copyout(&osb, uap->buf, sizeof(osb));
633 }
634 free(sfp, M_STATFS);
635 return (error);
636 }
637
638 /*
639 * Get statistics on all filesystems.
640 */
641 #ifndef _SYS_SYSPROTO_H_
642 struct freebsd4_getfsstat_args {
643 struct ostatfs *buf;
644 long bufsize;
645 int mode;
646 };
647 #endif
648 int
freebsd4_getfsstat(struct thread * td,struct freebsd4_getfsstat_args * uap)649 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap)
650 {
651 struct statfs *buf, *sp;
652 struct ostatfs osb;
653 size_t count, size;
654 int error;
655
656 if (uap->bufsize < 0)
657 return (EINVAL);
658 count = uap->bufsize / sizeof(struct ostatfs);
659 if (count > SIZE_MAX / sizeof(struct statfs))
660 return (EINVAL);
661 size = count * sizeof(struct statfs);
662 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
663 uap->mode);
664 if (error == 0)
665 td->td_retval[0] = count;
666 if (size != 0) {
667 sp = buf;
668 while (count != 0 && error == 0) {
669 freebsd4_cvtstatfs(sp, &osb);
670 error = copyout(&osb, uap->buf, sizeof(osb));
671 sp++;
672 uap->buf++;
673 count--;
674 }
675 free(buf, M_STATFS);
676 }
677 return (error);
678 }
679
680 /*
681 * Implement fstatfs() for (NFS) file handles.
682 */
683 #ifndef _SYS_SYSPROTO_H_
684 struct freebsd4_fhstatfs_args {
685 struct fhandle *u_fhp;
686 struct ostatfs *buf;
687 };
688 #endif
689 int
freebsd4_fhstatfs(struct thread * td,struct freebsd4_fhstatfs_args * uap)690 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap)
691 {
692 struct ostatfs osb;
693 struct statfs *sfp;
694 fhandle_t fh;
695 int error;
696
697 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
698 if (error != 0)
699 return (error);
700 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
701 error = kern_fhstatfs(td, fh, sfp);
702 if (error == 0) {
703 freebsd4_cvtstatfs(sfp, &osb);
704 error = copyout(&osb, uap->buf, sizeof(osb));
705 }
706 free(sfp, M_STATFS);
707 return (error);
708 }
709
710 /*
711 * Convert a new format statfs structure to an old format statfs structure.
712 */
713 static void
freebsd4_cvtstatfs(struct statfs * nsp,struct ostatfs * osp)714 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp)
715 {
716
717 statfs_scale_blocks(nsp, LONG_MAX);
718 bzero(osp, sizeof(*osp));
719 osp->f_bsize = nsp->f_bsize;
720 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
721 osp->f_blocks = nsp->f_blocks;
722 osp->f_bfree = nsp->f_bfree;
723 osp->f_bavail = nsp->f_bavail;
724 osp->f_files = MIN(nsp->f_files, LONG_MAX);
725 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
726 osp->f_owner = nsp->f_owner;
727 osp->f_type = nsp->f_type;
728 osp->f_flags = nsp->f_flags;
729 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
730 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
731 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
732 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
733 strlcpy(osp->f_fstypename, nsp->f_fstypename,
734 MIN(MFSNAMELEN, OMFSNAMELEN));
735 strlcpy(osp->f_mntonname, nsp->f_mntonname,
736 MIN(MNAMELEN, OMNAMELEN));
737 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
738 MIN(MNAMELEN, OMNAMELEN));
739 osp->f_fsid = nsp->f_fsid;
740 }
741 #endif /* COMPAT_FREEBSD4 */
742
743 #if defined(COMPAT_FREEBSD11)
744 /*
745 * Get old format filesystem statistics.
746 */
747 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *);
748
749 int
freebsd11_statfs(struct thread * td,struct freebsd11_statfs_args * uap)750 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap)
751 {
752 struct freebsd11_statfs osb;
753 struct statfs *sfp;
754 int error;
755
756 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
757 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
758 if (error == 0) {
759 freebsd11_cvtstatfs(sfp, &osb);
760 error = copyout(&osb, uap->buf, sizeof(osb));
761 }
762 free(sfp, M_STATFS);
763 return (error);
764 }
765
766 /*
767 * Get filesystem statistics.
768 */
769 int
freebsd11_fstatfs(struct thread * td,struct freebsd11_fstatfs_args * uap)770 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap)
771 {
772 struct freebsd11_statfs osb;
773 struct statfs *sfp;
774 int error;
775
776 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
777 error = kern_fstatfs(td, uap->fd, sfp);
778 if (error == 0) {
779 freebsd11_cvtstatfs(sfp, &osb);
780 error = copyout(&osb, uap->buf, sizeof(osb));
781 }
782 free(sfp, M_STATFS);
783 return (error);
784 }
785
786 /*
787 * Get statistics on all filesystems.
788 */
789 int
freebsd11_getfsstat(struct thread * td,struct freebsd11_getfsstat_args * uap)790 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap)
791 {
792 return (kern_freebsd11_getfsstat(td, uap->buf, uap->bufsize, uap->mode));
793 }
794
795 int
kern_freebsd11_getfsstat(struct thread * td,struct freebsd11_statfs * ubuf,long bufsize,int mode)796 kern_freebsd11_getfsstat(struct thread *td, struct freebsd11_statfs * ubuf,
797 long bufsize, int mode)
798 {
799 struct freebsd11_statfs osb;
800 struct statfs *buf, *sp;
801 size_t count, size;
802 int error;
803
804 if (bufsize < 0)
805 return (EINVAL);
806
807 count = bufsize / sizeof(struct ostatfs);
808 size = count * sizeof(struct statfs);
809 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, mode);
810 if (error == 0)
811 td->td_retval[0] = count;
812 if (size > 0) {
813 sp = buf;
814 while (count > 0 && error == 0) {
815 freebsd11_cvtstatfs(sp, &osb);
816 error = copyout(&osb, ubuf, sizeof(osb));
817 sp++;
818 ubuf++;
819 count--;
820 }
821 free(buf, M_STATFS);
822 }
823 return (error);
824 }
825
826 /*
827 * Implement fstatfs() for (NFS) file handles.
828 */
829 int
freebsd11_fhstatfs(struct thread * td,struct freebsd11_fhstatfs_args * uap)830 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap)
831 {
832 struct freebsd11_statfs osb;
833 struct statfs *sfp;
834 fhandle_t fh;
835 int error;
836
837 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
838 if (error)
839 return (error);
840 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
841 error = kern_fhstatfs(td, fh, sfp);
842 if (error == 0) {
843 freebsd11_cvtstatfs(sfp, &osb);
844 error = copyout(&osb, uap->buf, sizeof(osb));
845 }
846 free(sfp, M_STATFS);
847 return (error);
848 }
849
850 /*
851 * Convert a new format statfs structure to an old format statfs structure.
852 */
853 static void
freebsd11_cvtstatfs(struct statfs * nsp,struct freebsd11_statfs * osp)854 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp)
855 {
856
857 bzero(osp, sizeof(*osp));
858 osp->f_version = FREEBSD11_STATFS_VERSION;
859 osp->f_type = nsp->f_type;
860 osp->f_flags = nsp->f_flags;
861 osp->f_bsize = nsp->f_bsize;
862 osp->f_iosize = nsp->f_iosize;
863 osp->f_blocks = nsp->f_blocks;
864 osp->f_bfree = nsp->f_bfree;
865 osp->f_bavail = nsp->f_bavail;
866 osp->f_files = nsp->f_files;
867 osp->f_ffree = nsp->f_ffree;
868 osp->f_syncwrites = nsp->f_syncwrites;
869 osp->f_asyncwrites = nsp->f_asyncwrites;
870 osp->f_syncreads = nsp->f_syncreads;
871 osp->f_asyncreads = nsp->f_asyncreads;
872 osp->f_namemax = nsp->f_namemax;
873 osp->f_owner = nsp->f_owner;
874 osp->f_fsid = nsp->f_fsid;
875 strlcpy(osp->f_fstypename, nsp->f_fstypename,
876 MIN(MFSNAMELEN, sizeof(osp->f_fstypename)));
877 strlcpy(osp->f_mntonname, nsp->f_mntonname,
878 MIN(MNAMELEN, sizeof(osp->f_mntonname)));
879 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
880 MIN(MNAMELEN, sizeof(osp->f_mntfromname)));
881 }
882 #endif /* COMPAT_FREEBSD11 */
883
884 /*
885 * Change current working directory to a given file descriptor.
886 */
887 #ifndef _SYS_SYSPROTO_H_
888 struct fchdir_args {
889 int fd;
890 };
891 #endif
892 int
sys_fchdir(struct thread * td,struct fchdir_args * uap)893 sys_fchdir(struct thread *td, struct fchdir_args *uap)
894 {
895 struct vnode *vp, *tdp;
896 struct mount *mp;
897 struct file *fp;
898 int error;
899
900 AUDIT_ARG_FD(uap->fd);
901 error = getvnode_path(td, uap->fd, &cap_fchdir_rights,
902 &fp);
903 if (error != 0)
904 return (error);
905 vp = fp->f_vnode;
906 vrefact(vp);
907 fdrop(fp, td);
908 vn_lock(vp, LK_SHARED | LK_RETRY);
909 AUDIT_ARG_VNODE1(vp);
910 error = change_dir(vp, td);
911 while (!error && (mp = vp->v_mountedhere) != NULL) {
912 if (vfs_busy(mp, 0))
913 continue;
914 error = VFS_ROOT(mp, LK_SHARED, &tdp);
915 vfs_unbusy(mp);
916 if (error != 0)
917 break;
918 vput(vp);
919 vp = tdp;
920 }
921 if (error != 0) {
922 vput(vp);
923 return (error);
924 }
925 VOP_UNLOCK(vp);
926 pwd_chdir(td, vp);
927 return (0);
928 }
929
930 /*
931 * Change current working directory (``.'').
932 */
933 #ifndef _SYS_SYSPROTO_H_
934 struct chdir_args {
935 char *path;
936 };
937 #endif
938 int
sys_chdir(struct thread * td,struct chdir_args * uap)939 sys_chdir(struct thread *td, struct chdir_args *uap)
940 {
941
942 return (kern_chdir(td, uap->path, UIO_USERSPACE));
943 }
944
945 int
kern_chdir(struct thread * td,const char * path,enum uio_seg pathseg)946 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg)
947 {
948 struct nameidata nd;
949 int error;
950
951 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
952 pathseg, path);
953 if ((error = namei(&nd)) != 0)
954 return (error);
955 if ((error = change_dir(nd.ni_vp, td)) != 0) {
956 vput(nd.ni_vp);
957 NDFREE_PNBUF(&nd);
958 return (error);
959 }
960 VOP_UNLOCK(nd.ni_vp);
961 NDFREE_PNBUF(&nd);
962 pwd_chdir(td, nd.ni_vp);
963 return (0);
964 }
965
966 static int unprivileged_chroot = 0;
967 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_chroot, CTLFLAG_RW,
968 &unprivileged_chroot, 0,
969 "Unprivileged processes can use chroot(2)");
970 /*
971 * Change notion of root (``/'') directory.
972 */
973 #ifndef _SYS_SYSPROTO_H_
974 struct chroot_args {
975 char *path;
976 };
977 #endif
978 int
sys_chroot(struct thread * td,struct chroot_args * uap)979 sys_chroot(struct thread *td, struct chroot_args *uap)
980 {
981 struct nameidata nd;
982 struct proc *p;
983 int error;
984
985 error = priv_check(td, PRIV_VFS_CHROOT);
986 if (error != 0) {
987 p = td->td_proc;
988 PROC_LOCK(p);
989 if (unprivileged_chroot == 0 ||
990 (p->p_flag2 & P2_NO_NEW_PRIVS) == 0) {
991 PROC_UNLOCK(p);
992 return (error);
993 }
994 PROC_UNLOCK(p);
995 }
996 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
997 UIO_USERSPACE, uap->path);
998 error = namei(&nd);
999 if (error != 0)
1000 return (error);
1001 NDFREE_PNBUF(&nd);
1002 error = change_dir(nd.ni_vp, td);
1003 if (error != 0)
1004 goto e_vunlock;
1005 #ifdef MAC
1006 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
1007 if (error != 0)
1008 goto e_vunlock;
1009 #endif
1010 VOP_UNLOCK(nd.ni_vp);
1011 error = pwd_chroot(td, nd.ni_vp);
1012 vrele(nd.ni_vp);
1013 return (error);
1014 e_vunlock:
1015 vput(nd.ni_vp);
1016 return (error);
1017 }
1018
1019 /*
1020 * Common routine for chroot and chdir. Callers must provide a locked vnode
1021 * instance.
1022 */
1023 int
change_dir(struct vnode * vp,struct thread * td)1024 change_dir(struct vnode *vp, struct thread *td)
1025 {
1026 #ifdef MAC
1027 int error;
1028 #endif
1029
1030 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
1031 if (vp->v_type != VDIR)
1032 return (ENOTDIR);
1033 #ifdef MAC
1034 error = mac_vnode_check_chdir(td->td_ucred, vp);
1035 if (error != 0)
1036 return (error);
1037 #endif
1038 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
1039 }
1040
1041 static __inline void
flags_to_rights(int flags,cap_rights_t * rightsp)1042 flags_to_rights(int flags, cap_rights_t *rightsp)
1043 {
1044 if (flags & O_EXEC) {
1045 cap_rights_set_one(rightsp, CAP_FEXECVE);
1046 if (flags & O_PATH)
1047 return;
1048 } else {
1049 switch ((flags & O_ACCMODE)) {
1050 case O_RDONLY:
1051 cap_rights_set_one(rightsp, CAP_READ);
1052 break;
1053 case O_RDWR:
1054 cap_rights_set_one(rightsp, CAP_READ);
1055 /* FALLTHROUGH */
1056 case O_WRONLY:
1057 cap_rights_set_one(rightsp, CAP_WRITE);
1058 if (!(flags & (O_APPEND | O_TRUNC)))
1059 cap_rights_set_one(rightsp, CAP_SEEK);
1060 break;
1061 }
1062 }
1063
1064 if (flags & O_CREAT)
1065 cap_rights_set_one(rightsp, CAP_CREATE);
1066
1067 if (flags & O_TRUNC)
1068 cap_rights_set_one(rightsp, CAP_FTRUNCATE);
1069
1070 if (flags & (O_SYNC | O_FSYNC))
1071 cap_rights_set_one(rightsp, CAP_FSYNC);
1072
1073 if (flags & (O_EXLOCK | O_SHLOCK))
1074 cap_rights_set_one(rightsp, CAP_FLOCK);
1075 }
1076
1077 /*
1078 * Check permissions, allocate an open file structure, and call the device
1079 * open routine if any.
1080 */
1081 #ifndef _SYS_SYSPROTO_H_
1082 struct open_args {
1083 char *path;
1084 int flags;
1085 int mode;
1086 };
1087 #endif
1088 int
sys_open(struct thread * td,struct open_args * uap)1089 sys_open(struct thread *td, struct open_args *uap)
1090 {
1091
1092 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1093 uap->flags, uap->mode));
1094 }
1095
1096 #ifndef _SYS_SYSPROTO_H_
1097 struct openat_args {
1098 int fd;
1099 char *path;
1100 int flag;
1101 int mode;
1102 };
1103 #endif
1104 int
sys_openat(struct thread * td,struct openat_args * uap)1105 sys_openat(struct thread *td, struct openat_args *uap)
1106 {
1107
1108 AUDIT_ARG_FD(uap->fd);
1109 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1110 uap->mode));
1111 }
1112
1113 /*
1114 * If fpp != NULL, opened file is not installed into the file
1115 * descriptor table, instead it is returned in *fpp. This is
1116 * incompatible with fdopen(), in which case we return EINVAL.
1117 */
1118 static int
openatfp(struct thread * td,int dirfd,const char * path,enum uio_seg pathseg,int flags,int mode,struct file ** fpp)1119 openatfp(struct thread *td, int dirfd, const char *path,
1120 enum uio_seg pathseg, int flags, int mode, struct file **fpp)
1121 {
1122 struct proc *p;
1123 struct filedesc *fdp;
1124 struct pwddesc *pdp;
1125 struct file *fp;
1126 struct vnode *vp;
1127 struct filecaps *fcaps;
1128 struct nameidata nd;
1129 cap_rights_t rights;
1130 int cmode, error, indx;
1131
1132 indx = -1;
1133 p = td->td_proc;
1134 fdp = p->p_fd;
1135 pdp = p->p_pd;
1136
1137 AUDIT_ARG_FFLAGS(flags);
1138 AUDIT_ARG_MODE(mode);
1139 cap_rights_init_one(&rights, CAP_LOOKUP);
1140 flags_to_rights(flags, &rights);
1141
1142 /*
1143 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1144 * may be specified. On the other hand, for O_PATH any mode
1145 * except O_EXEC is ignored.
1146 */
1147 if ((flags & O_PATH) != 0) {
1148 flags &= ~(O_CREAT | O_ACCMODE);
1149 } else if ((flags & O_EXEC) != 0) {
1150 if (flags & O_ACCMODE)
1151 return (EINVAL);
1152 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1153 return (EINVAL);
1154 } else {
1155 flags = FFLAGS(flags);
1156 }
1157
1158 /*
1159 * Allocate a file structure. The descriptor to reference it
1160 * is allocated and used by finstall_refed() below.
1161 */
1162 error = falloc_noinstall(td, &fp);
1163 if (error != 0)
1164 return (error);
1165 /* Set the flags early so the finit in devfs can pick them up. */
1166 fp->f_flag = flags & FMASK;
1167 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT;
1168 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | WANTIOCTLCAPS,
1169 pathseg, path, dirfd, &rights);
1170 td->td_dupfd = -1; /* XXX check for fdopen */
1171 error = vn_open_cred(&nd, &flags, cmode, VN_OPEN_WANTIOCTLCAPS,
1172 td->td_ucred, fp);
1173 if (error != 0) {
1174 /*
1175 * If the vn_open replaced the method vector, something
1176 * wonderous happened deep below and we just pass it up
1177 * pretending we know what we do.
1178 */
1179 if (error == ENXIO && fp->f_ops != &badfileops) {
1180 MPASS((flags & O_PATH) == 0);
1181 goto success;
1182 }
1183
1184 /*
1185 * Handle special fdopen() case. bleh.
1186 *
1187 * Don't do this for relative (capability) lookups; we don't
1188 * understand exactly what would happen, and we don't think
1189 * that it ever should.
1190 */
1191 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 &&
1192 (error == ENODEV || error == ENXIO) &&
1193 td->td_dupfd >= 0) {
1194 MPASS(fpp == NULL);
1195 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1196 &indx);
1197 if (error == 0)
1198 goto success;
1199 }
1200
1201 goto bad;
1202 }
1203 td->td_dupfd = 0;
1204 NDFREE_PNBUF(&nd);
1205 vp = nd.ni_vp;
1206
1207 /*
1208 * Store the vnode, for any f_type. Typically, the vnode use
1209 * count is decremented by direct call to vn_closefile() for
1210 * files that switched type in the cdevsw fdopen() method.
1211 */
1212 fp->f_vnode = vp;
1213
1214 /*
1215 * If the file wasn't claimed by devfs bind it to the normal
1216 * vnode operations here.
1217 */
1218 if (fp->f_ops == &badfileops) {
1219 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0,
1220 ("Unexpected fifo fp %p vp %p", fp, vp));
1221 if ((flags & O_PATH) != 0) {
1222 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED),
1223 DTYPE_VNODE, NULL, &path_fileops);
1224 } else {
1225 finit_vnode(fp, flags, NULL, &vnops);
1226 }
1227 }
1228
1229 VOP_UNLOCK(vp);
1230 if (flags & O_TRUNC) {
1231 error = fo_truncate(fp, 0, td->td_ucred, td);
1232 if (error != 0)
1233 goto bad;
1234 }
1235 success:
1236 if (fpp != NULL) {
1237 MPASS(error == 0);
1238 NDFREE_IOCTLCAPS(&nd);
1239 *fpp = fp;
1240 return (0);
1241 }
1242
1243 /*
1244 * If we haven't already installed the FD (for dupfdopen), do so now.
1245 */
1246 if (indx == -1) {
1247 #ifdef CAPABILITIES
1248 if ((nd.ni_resflags & NIRES_STRICTREL) != 0)
1249 fcaps = &nd.ni_filecaps;
1250 else
1251 #endif
1252 fcaps = NULL;
1253 error = finstall_refed(td, fp, &indx, flags, fcaps);
1254 /* On success finstall_refed() consumes fcaps. */
1255 if (error != 0) {
1256 goto bad;
1257 }
1258 } else {
1259 NDFREE_IOCTLCAPS(&nd);
1260 falloc_abort(td, fp);
1261 }
1262
1263 td->td_retval[0] = indx;
1264 return (0);
1265 bad:
1266 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1267 NDFREE_IOCTLCAPS(&nd);
1268 falloc_abort(td, fp);
1269 return (error);
1270 }
1271
1272 int
kern_openat(struct thread * td,int dirfd,const char * path,enum uio_seg pathseg,int flags,int mode)1273 kern_openat(struct thread *td, int dirfd, const char *path,
1274 enum uio_seg pathseg, int flags, int mode)
1275 {
1276 return (openatfp(td, dirfd, path, pathseg, flags, mode, NULL));
1277 }
1278
1279 int
kern_openatfp(struct thread * td,int dirfd,const char * path,enum uio_seg pathseg,int flags,int mode,struct file ** fpp)1280 kern_openatfp(struct thread *td, int dirfd, const char *path,
1281 enum uio_seg pathseg, int flags, int mode, struct file **fpp)
1282 {
1283 int error, old_dupfd;
1284
1285 old_dupfd = td->td_dupfd;
1286 td->td_dupfd = -1;
1287 error = openatfp(td, dirfd, path, pathseg, flags, mode, fpp);
1288 td->td_dupfd = old_dupfd;
1289 return (error);
1290 }
1291
1292 #ifdef COMPAT_43
1293 /*
1294 * Create a file.
1295 */
1296 #ifndef _SYS_SYSPROTO_H_
1297 struct ocreat_args {
1298 char *path;
1299 int mode;
1300 };
1301 #endif
1302 int
ocreat(struct thread * td,struct ocreat_args * uap)1303 ocreat(struct thread *td, struct ocreat_args *uap)
1304 {
1305
1306 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1307 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1308 }
1309 #endif /* COMPAT_43 */
1310
1311 /*
1312 * Create a special file.
1313 */
1314 #ifndef _SYS_SYSPROTO_H_
1315 struct mknodat_args {
1316 int fd;
1317 char *path;
1318 mode_t mode;
1319 dev_t dev;
1320 };
1321 #endif
1322 int
sys_mknodat(struct thread * td,struct mknodat_args * uap)1323 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1324 {
1325
1326 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1327 uap->dev));
1328 }
1329
1330 #if defined(COMPAT_FREEBSD11)
1331 int
freebsd11_mknod(struct thread * td,struct freebsd11_mknod_args * uap)1332 freebsd11_mknod(struct thread *td,
1333 struct freebsd11_mknod_args *uap)
1334 {
1335
1336 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1337 uap->mode, uap->dev));
1338 }
1339
1340 int
freebsd11_mknodat(struct thread * td,struct freebsd11_mknodat_args * uap)1341 freebsd11_mknodat(struct thread *td,
1342 struct freebsd11_mknodat_args *uap)
1343 {
1344
1345 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1346 uap->dev));
1347 }
1348 #endif /* COMPAT_FREEBSD11 */
1349
1350 int
kern_mknodat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int mode,dev_t dev)1351 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg,
1352 int mode, dev_t dev)
1353 {
1354 struct vnode *vp;
1355 struct mount *mp;
1356 struct vattr vattr;
1357 struct nameidata nd;
1358 int error, whiteout = 0;
1359
1360 AUDIT_ARG_MODE(mode);
1361 AUDIT_ARG_DEV(dev);
1362 switch (mode & S_IFMT) {
1363 case S_IFCHR:
1364 case S_IFBLK:
1365 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1366 if (error == 0 && dev == VNOVAL)
1367 error = EINVAL;
1368 break;
1369 case S_IFWHT:
1370 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1371 break;
1372 case S_IFIFO:
1373 if (dev == 0)
1374 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1375 /* FALLTHROUGH */
1376 default:
1377 error = EINVAL;
1378 break;
1379 }
1380 if (error != 0)
1381 return (error);
1382 NDPREINIT(&nd);
1383 restart:
1384 bwillwrite();
1385 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE,
1386 pathseg, path, fd, &cap_mknodat_rights);
1387 if ((error = namei(&nd)) != 0)
1388 return (error);
1389 vp = nd.ni_vp;
1390 if (vp != NULL) {
1391 NDFREE_PNBUF(&nd);
1392 if (vp == nd.ni_dvp)
1393 vrele(nd.ni_dvp);
1394 else
1395 vput(nd.ni_dvp);
1396 vrele(vp);
1397 return (EEXIST);
1398 } else {
1399 VATTR_NULL(&vattr);
1400 vattr.va_mode = (mode & ALLPERMS) &
1401 ~td->td_proc->p_pd->pd_cmask;
1402 vattr.va_rdev = dev;
1403 whiteout = 0;
1404
1405 switch (mode & S_IFMT) {
1406 case S_IFCHR:
1407 vattr.va_type = VCHR;
1408 break;
1409 case S_IFBLK:
1410 vattr.va_type = VBLK;
1411 break;
1412 case S_IFWHT:
1413 whiteout = 1;
1414 break;
1415 default:
1416 panic("kern_mknod: invalid mode");
1417 }
1418 }
1419 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1420 NDFREE_PNBUF(&nd);
1421 vput(nd.ni_dvp);
1422 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1423 return (error);
1424 goto restart;
1425 }
1426 #ifdef MAC
1427 if (error == 0 && !whiteout)
1428 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1429 &nd.ni_cnd, &vattr);
1430 #endif
1431 if (error == 0) {
1432 if (whiteout)
1433 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1434 else {
1435 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1436 &nd.ni_cnd, &vattr);
1437 }
1438 }
1439 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL,
1440 true);
1441 vn_finished_write(mp);
1442 NDFREE_PNBUF(&nd);
1443 if (error == ERELOOKUP)
1444 goto restart;
1445 return (error);
1446 }
1447
1448 /*
1449 * Create a named pipe.
1450 */
1451 #ifndef _SYS_SYSPROTO_H_
1452 struct mkfifo_args {
1453 char *path;
1454 int mode;
1455 };
1456 #endif
1457 int
sys_mkfifo(struct thread * td,struct mkfifo_args * uap)1458 sys_mkfifo(struct thread *td, struct mkfifo_args *uap)
1459 {
1460
1461 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1462 uap->mode));
1463 }
1464
1465 #ifndef _SYS_SYSPROTO_H_
1466 struct mkfifoat_args {
1467 int fd;
1468 char *path;
1469 mode_t mode;
1470 };
1471 #endif
1472 int
sys_mkfifoat(struct thread * td,struct mkfifoat_args * uap)1473 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1474 {
1475
1476 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1477 uap->mode));
1478 }
1479
1480 int
kern_mkfifoat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int mode)1481 kern_mkfifoat(struct thread *td, int fd, const char *path,
1482 enum uio_seg pathseg, int mode)
1483 {
1484 struct mount *mp;
1485 struct vattr vattr;
1486 struct nameidata nd;
1487 int error;
1488
1489 AUDIT_ARG_MODE(mode);
1490 NDPREINIT(&nd);
1491 restart:
1492 bwillwrite();
1493 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE,
1494 pathseg, path, fd, &cap_mkfifoat_rights);
1495 if ((error = namei(&nd)) != 0)
1496 return (error);
1497 if (nd.ni_vp != NULL) {
1498 NDFREE_PNBUF(&nd);
1499 if (nd.ni_vp == nd.ni_dvp)
1500 vrele(nd.ni_dvp);
1501 else
1502 vput(nd.ni_dvp);
1503 vrele(nd.ni_vp);
1504 return (EEXIST);
1505 }
1506 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1507 NDFREE_PNBUF(&nd);
1508 vput(nd.ni_dvp);
1509 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1510 return (error);
1511 goto restart;
1512 }
1513 VATTR_NULL(&vattr);
1514 vattr.va_type = VFIFO;
1515 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask;
1516 #ifdef MAC
1517 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1518 &vattr);
1519 if (error != 0)
1520 goto out;
1521 #endif
1522 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1523 #ifdef MAC
1524 out:
1525 #endif
1526 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
1527 vn_finished_write(mp);
1528 NDFREE_PNBUF(&nd);
1529 if (error == ERELOOKUP)
1530 goto restart;
1531 return (error);
1532 }
1533
1534 /*
1535 * Make a hard file link.
1536 */
1537 #ifndef _SYS_SYSPROTO_H_
1538 struct link_args {
1539 char *path;
1540 char *link;
1541 };
1542 #endif
1543 int
sys_link(struct thread * td,struct link_args * uap)1544 sys_link(struct thread *td, struct link_args *uap)
1545 {
1546
1547 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
1548 UIO_USERSPACE, AT_SYMLINK_FOLLOW));
1549 }
1550
1551 #ifndef _SYS_SYSPROTO_H_
1552 struct linkat_args {
1553 int fd1;
1554 char *path1;
1555 int fd2;
1556 char *path2;
1557 int flag;
1558 };
1559 #endif
1560 int
sys_linkat(struct thread * td,struct linkat_args * uap)1561 sys_linkat(struct thread *td, struct linkat_args *uap)
1562 {
1563
1564 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1565 UIO_USERSPACE, uap->flag));
1566 }
1567
1568 int hardlink_check_uid = 0;
1569 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1570 &hardlink_check_uid, 0,
1571 "Unprivileged processes cannot create hard links to files owned by other "
1572 "users");
1573 static int hardlink_check_gid = 0;
1574 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1575 &hardlink_check_gid, 0,
1576 "Unprivileged processes cannot create hard links to files owned by other "
1577 "groups");
1578
1579 static int
can_hardlink(struct vnode * vp,struct ucred * cred)1580 can_hardlink(struct vnode *vp, struct ucred *cred)
1581 {
1582 struct vattr va;
1583 int error;
1584
1585 if (!hardlink_check_uid && !hardlink_check_gid)
1586 return (0);
1587
1588 error = VOP_GETATTR(vp, &va, cred);
1589 if (error != 0)
1590 return (error);
1591
1592 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1593 error = priv_check_cred(cred, PRIV_VFS_LINK);
1594 if (error != 0)
1595 return (error);
1596 }
1597
1598 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1599 error = priv_check_cred(cred, PRIV_VFS_LINK);
1600 if (error != 0)
1601 return (error);
1602 }
1603
1604 return (0);
1605 }
1606
1607 int
kern_linkat(struct thread * td,int fd1,int fd2,const char * path1,const char * path2,enum uio_seg segflag,int flag)1608 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1,
1609 const char *path2, enum uio_seg segflag, int flag)
1610 {
1611 struct nameidata nd;
1612 int error;
1613
1614 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH |
1615 AT_EMPTY_PATH)) != 0)
1616 return (EINVAL);
1617
1618 NDPREINIT(&nd);
1619 do {
1620 bwillwrite();
1621 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag,
1622 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH),
1623 segflag, path1, fd1, &cap_linkat_source_rights);
1624 if ((error = namei(&nd)) != 0)
1625 return (error);
1626 NDFREE_PNBUF(&nd);
1627 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) {
1628 error = priv_check(td, PRIV_VFS_FHOPEN);
1629 if (error != 0) {
1630 vrele(nd.ni_vp);
1631 return (error);
1632 }
1633 }
1634 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag);
1635 } while (error == EAGAIN || error == ERELOOKUP);
1636 return (error);
1637 }
1638
1639 static int
kern_linkat_vp(struct thread * td,struct vnode * vp,int fd,const char * path,enum uio_seg segflag)1640 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path,
1641 enum uio_seg segflag)
1642 {
1643 struct nameidata nd;
1644 struct mount *mp;
1645 int error;
1646
1647 if (vp->v_type == VDIR) {
1648 vrele(vp);
1649 return (EPERM); /* POSIX */
1650 }
1651 NDINIT_ATRIGHTS(&nd, CREATE,
1652 LOCKPARENT | AUDITVNODE2 | NOCACHE, segflag, path, fd,
1653 &cap_linkat_target_rights);
1654 if ((error = namei(&nd)) == 0) {
1655 if (nd.ni_vp != NULL) {
1656 NDFREE_PNBUF(&nd);
1657 if (nd.ni_dvp == nd.ni_vp)
1658 vrele(nd.ni_dvp);
1659 else
1660 vput(nd.ni_dvp);
1661 vrele(nd.ni_vp);
1662 vrele(vp);
1663 return (EEXIST);
1664 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1665 /*
1666 * Cross-device link. No need to recheck
1667 * vp->v_type, since it cannot change, except
1668 * to VBAD.
1669 */
1670 NDFREE_PNBUF(&nd);
1671 vput(nd.ni_dvp);
1672 vrele(vp);
1673 return (EXDEV);
1674 } else if (vn_lock(vp, LK_EXCLUSIVE) == 0) {
1675 error = can_hardlink(vp, td->td_ucred);
1676 #ifdef MAC
1677 if (error == 0)
1678 error = mac_vnode_check_link(td->td_ucred,
1679 nd.ni_dvp, vp, &nd.ni_cnd);
1680 #endif
1681 if (error != 0) {
1682 vput(vp);
1683 vput(nd.ni_dvp);
1684 NDFREE_PNBUF(&nd);
1685 return (error);
1686 }
1687 error = vn_start_write(vp, &mp, V_NOWAIT);
1688 if (error != 0) {
1689 vput(vp);
1690 vput(nd.ni_dvp);
1691 NDFREE_PNBUF(&nd);
1692 error = vn_start_write(NULL, &mp,
1693 V_XSLEEP | V_PCATCH);
1694 if (error != 0)
1695 return (error);
1696 return (EAGAIN);
1697 }
1698 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1699 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true);
1700 vn_finished_write(mp);
1701 NDFREE_PNBUF(&nd);
1702 vp = NULL;
1703 } else {
1704 vput(nd.ni_dvp);
1705 NDFREE_PNBUF(&nd);
1706 vrele(vp);
1707 return (EAGAIN);
1708 }
1709 }
1710 if (vp != NULL)
1711 vrele(vp);
1712 return (error);
1713 }
1714
1715 /*
1716 * Make a symbolic link.
1717 */
1718 #ifndef _SYS_SYSPROTO_H_
1719 struct symlink_args {
1720 char *path;
1721 char *link;
1722 };
1723 #endif
1724 int
sys_symlink(struct thread * td,struct symlink_args * uap)1725 sys_symlink(struct thread *td, struct symlink_args *uap)
1726 {
1727
1728 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
1729 UIO_USERSPACE));
1730 }
1731
1732 #ifndef _SYS_SYSPROTO_H_
1733 struct symlinkat_args {
1734 char *path;
1735 int fd;
1736 char *path2;
1737 };
1738 #endif
1739 int
sys_symlinkat(struct thread * td,struct symlinkat_args * uap)1740 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1741 {
1742
1743 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1744 UIO_USERSPACE));
1745 }
1746
1747 int
kern_symlinkat(struct thread * td,const char * path1,int fd,const char * path2,enum uio_seg segflg)1748 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2,
1749 enum uio_seg segflg)
1750 {
1751 struct mount *mp;
1752 struct vattr vattr;
1753 const char *syspath;
1754 char *tmppath;
1755 struct nameidata nd;
1756 int error;
1757
1758 if (segflg == UIO_SYSSPACE) {
1759 syspath = path1;
1760 } else {
1761 tmppath = uma_zalloc(namei_zone, M_WAITOK);
1762 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0)
1763 goto out;
1764 syspath = tmppath;
1765 }
1766 AUDIT_ARG_TEXT(syspath);
1767 NDPREINIT(&nd);
1768 restart:
1769 bwillwrite();
1770 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, segflg,
1771 path2, fd, &cap_symlinkat_rights);
1772 if ((error = namei(&nd)) != 0)
1773 goto out;
1774 if (nd.ni_vp) {
1775 NDFREE_PNBUF(&nd);
1776 if (nd.ni_vp == nd.ni_dvp)
1777 vrele(nd.ni_dvp);
1778 else
1779 vput(nd.ni_dvp);
1780 vrele(nd.ni_vp);
1781 nd.ni_vp = NULL;
1782 error = EEXIST;
1783 goto out;
1784 }
1785 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1786 NDFREE_PNBUF(&nd);
1787 vput(nd.ni_dvp);
1788 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1789 goto out;
1790 goto restart;
1791 }
1792 VATTR_NULL(&vattr);
1793 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask;
1794 #ifdef MAC
1795 vattr.va_type = VLNK;
1796 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1797 &vattr);
1798 if (error != 0)
1799 goto out2;
1800 #endif
1801 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1802 #ifdef MAC
1803 out2:
1804 #endif
1805 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
1806 vn_finished_write(mp);
1807 NDFREE_PNBUF(&nd);
1808 if (error == ERELOOKUP)
1809 goto restart;
1810 out:
1811 if (segflg != UIO_SYSSPACE)
1812 uma_zfree(namei_zone, tmppath);
1813 return (error);
1814 }
1815
1816 /*
1817 * Delete a whiteout from the filesystem.
1818 */
1819 #ifndef _SYS_SYSPROTO_H_
1820 struct undelete_args {
1821 char *path;
1822 };
1823 #endif
1824 int
sys_undelete(struct thread * td,struct undelete_args * uap)1825 sys_undelete(struct thread *td, struct undelete_args *uap)
1826 {
1827 struct mount *mp;
1828 struct nameidata nd;
1829 int error;
1830
1831 NDPREINIT(&nd);
1832 restart:
1833 bwillwrite();
1834 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1835 UIO_USERSPACE, uap->path);
1836 error = namei(&nd);
1837 if (error != 0)
1838 return (error);
1839
1840 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1841 NDFREE_PNBUF(&nd);
1842 if (nd.ni_vp == nd.ni_dvp)
1843 vrele(nd.ni_dvp);
1844 else
1845 vput(nd.ni_dvp);
1846 if (nd.ni_vp)
1847 vrele(nd.ni_vp);
1848 return (EEXIST);
1849 }
1850 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1851 NDFREE_PNBUF(&nd);
1852 vput(nd.ni_dvp);
1853 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1854 return (error);
1855 goto restart;
1856 }
1857 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1858 NDFREE_PNBUF(&nd);
1859 vput(nd.ni_dvp);
1860 vn_finished_write(mp);
1861 if (error == ERELOOKUP)
1862 goto restart;
1863 return (error);
1864 }
1865
1866 /*
1867 * Delete a name from the filesystem.
1868 */
1869 #ifndef _SYS_SYSPROTO_H_
1870 struct unlink_args {
1871 char *path;
1872 };
1873 #endif
1874 int
sys_unlink(struct thread * td,struct unlink_args * uap)1875 sys_unlink(struct thread *td, struct unlink_args *uap)
1876 {
1877
1878 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
1879 0, 0));
1880 }
1881
1882 static int
kern_funlinkat_ex(struct thread * td,int dfd,const char * path,int fd,int flag,enum uio_seg pathseg,ino_t oldinum)1883 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd,
1884 int flag, enum uio_seg pathseg, ino_t oldinum)
1885 {
1886
1887 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0)
1888 return (EINVAL);
1889
1890 if ((flag & AT_REMOVEDIR) != 0)
1891 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0));
1892
1893 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0));
1894 }
1895
1896 #ifndef _SYS_SYSPROTO_H_
1897 struct unlinkat_args {
1898 int fd;
1899 char *path;
1900 int flag;
1901 };
1902 #endif
1903 int
sys_unlinkat(struct thread * td,struct unlinkat_args * uap)1904 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1905 {
1906
1907 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag,
1908 UIO_USERSPACE, 0));
1909 }
1910
1911 #ifndef _SYS_SYSPROTO_H_
1912 struct funlinkat_args {
1913 int dfd;
1914 const char *path;
1915 int fd;
1916 int flag;
1917 };
1918 #endif
1919 int
sys_funlinkat(struct thread * td,struct funlinkat_args * uap)1920 sys_funlinkat(struct thread *td, struct funlinkat_args *uap)
1921 {
1922
1923 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag,
1924 UIO_USERSPACE, 0));
1925 }
1926
1927 int
kern_funlinkat(struct thread * td,int dfd,const char * path,int fd,enum uio_seg pathseg,int flag,ino_t oldinum)1928 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd,
1929 enum uio_seg pathseg, int flag, ino_t oldinum)
1930 {
1931 struct mount *mp;
1932 struct file *fp;
1933 struct vnode *vp;
1934 struct nameidata nd;
1935 struct stat sb;
1936 int error;
1937
1938 fp = NULL;
1939 if (fd != FD_NONE) {
1940 error = getvnode_path(td, fd, &cap_no_rights, &fp);
1941 if (error != 0)
1942 return (error);
1943 }
1944
1945 NDPREINIT(&nd);
1946 restart:
1947 bwillwrite();
1948 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
1949 at2cnpflags(flag, AT_RESOLVE_BENEATH),
1950 pathseg, path, dfd, &cap_unlinkat_rights);
1951 if ((error = namei(&nd)) != 0) {
1952 if (error == EINVAL)
1953 error = EPERM;
1954 goto fdout;
1955 }
1956 vp = nd.ni_vp;
1957 if (vp->v_type == VDIR && oldinum == 0) {
1958 error = EPERM; /* POSIX */
1959 } else if (oldinum != 0 &&
1960 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED)) == 0) &&
1961 sb.st_ino != oldinum) {
1962 error = EIDRM; /* Identifier removed */
1963 } else if (fp != NULL && fp->f_vnode != vp) {
1964 if (VN_IS_DOOMED(fp->f_vnode))
1965 error = EBADF;
1966 else
1967 error = EDEADLK;
1968 } else {
1969 /*
1970 * The root of a mounted filesystem cannot be deleted.
1971 *
1972 * XXX: can this only be a VDIR case?
1973 */
1974 if (vp->v_vflag & VV_ROOT)
1975 error = EBUSY;
1976 }
1977 if (error == 0) {
1978 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1979 NDFREE_PNBUF(&nd);
1980 vput(nd.ni_dvp);
1981 if (vp == nd.ni_dvp)
1982 vrele(vp);
1983 else
1984 vput(vp);
1985 if ((error = vn_start_write(NULL, &mp,
1986 V_XSLEEP | V_PCATCH)) != 0) {
1987 goto fdout;
1988 }
1989 goto restart;
1990 }
1991 #ifdef MAC
1992 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1993 &nd.ni_cnd);
1994 if (error != 0)
1995 goto out;
1996 #endif
1997 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1998 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1999 #ifdef MAC
2000 out:
2001 #endif
2002 vn_finished_write(mp);
2003 }
2004 NDFREE_PNBUF(&nd);
2005 vput(nd.ni_dvp);
2006 if (vp == nd.ni_dvp)
2007 vrele(vp);
2008 else
2009 vput(vp);
2010 if (error == ERELOOKUP)
2011 goto restart;
2012 fdout:
2013 if (fp != NULL)
2014 fdrop(fp, td);
2015 return (error);
2016 }
2017
2018 /*
2019 * Reposition read/write file offset.
2020 */
2021 #ifndef _SYS_SYSPROTO_H_
2022 struct lseek_args {
2023 int fd;
2024 int pad;
2025 off_t offset;
2026 int whence;
2027 };
2028 #endif
2029 int
sys_lseek(struct thread * td,struct lseek_args * uap)2030 sys_lseek(struct thread *td, struct lseek_args *uap)
2031 {
2032
2033 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2034 }
2035
2036 int
kern_lseek(struct thread * td,int fd,off_t offset,int whence)2037 kern_lseek(struct thread *td, int fd, off_t offset, int whence)
2038 {
2039 struct file *fp;
2040 int error;
2041
2042 AUDIT_ARG_FD(fd);
2043 error = fget(td, fd, &cap_seek_rights, &fp);
2044 if (error != 0)
2045 return (error);
2046 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
2047 fo_seek(fp, offset, whence, td) : ESPIPE;
2048 fdrop(fp, td);
2049 return (error);
2050 }
2051
2052 #if defined(COMPAT_43)
2053 /*
2054 * Reposition read/write file offset.
2055 */
2056 #ifndef _SYS_SYSPROTO_H_
2057 struct olseek_args {
2058 int fd;
2059 long offset;
2060 int whence;
2061 };
2062 #endif
2063 int
olseek(struct thread * td,struct olseek_args * uap)2064 olseek(struct thread *td, struct olseek_args *uap)
2065 {
2066
2067 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2068 }
2069 #endif /* COMPAT_43 */
2070
2071 #if defined(COMPAT_FREEBSD6)
2072 /* Version with the 'pad' argument */
2073 int
freebsd6_lseek(struct thread * td,struct freebsd6_lseek_args * uap)2074 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap)
2075 {
2076
2077 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2078 }
2079 #endif
2080
2081 /*
2082 * Check access permissions using passed credentials.
2083 */
2084 static int
vn_access(struct vnode * vp,int user_flags,struct ucred * cred,struct thread * td)2085 vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
2086 struct thread *td)
2087 {
2088 accmode_t accmode;
2089 int error;
2090
2091 /* Flags == 0 means only check for existence. */
2092 if (user_flags == 0)
2093 return (0);
2094
2095 accmode = 0;
2096 if (user_flags & R_OK)
2097 accmode |= VREAD;
2098 if (user_flags & W_OK)
2099 accmode |= VWRITE;
2100 if (user_flags & X_OK)
2101 accmode |= VEXEC;
2102 #ifdef MAC
2103 error = mac_vnode_check_access(cred, vp, accmode);
2104 if (error != 0)
2105 return (error);
2106 #endif
2107 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
2108 error = VOP_ACCESS(vp, accmode, cred, td);
2109 return (error);
2110 }
2111
2112 /*
2113 * Check access permissions using "real" credentials.
2114 */
2115 #ifndef _SYS_SYSPROTO_H_
2116 struct access_args {
2117 char *path;
2118 int amode;
2119 };
2120 #endif
2121 int
sys_access(struct thread * td,struct access_args * uap)2122 sys_access(struct thread *td, struct access_args *uap)
2123 {
2124
2125 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2126 0, uap->amode));
2127 }
2128
2129 #ifndef _SYS_SYSPROTO_H_
2130 struct faccessat_args {
2131 int dirfd;
2132 char *path;
2133 int amode;
2134 int flag;
2135 }
2136 #endif
2137 int
sys_faccessat(struct thread * td,struct faccessat_args * uap)2138 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2139 {
2140
2141 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2142 uap->amode));
2143 }
2144
2145 int
kern_accessat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int flag,int amode)2146 kern_accessat(struct thread *td, int fd, const char *path,
2147 enum uio_seg pathseg, int flag, int amode)
2148 {
2149 struct ucred *cred, *usecred;
2150 struct vnode *vp;
2151 struct nameidata nd;
2152 int error;
2153
2154 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH |
2155 AT_SYMLINK_NOFOLLOW)) != 0)
2156 return (EINVAL);
2157 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
2158 return (EINVAL);
2159
2160 /*
2161 * Create and modify a temporary credential instead of one that
2162 * is potentially shared (if we need one).
2163 */
2164 cred = td->td_ucred;
2165 if ((flag & AT_EACCESS) == 0 &&
2166 ((cred->cr_uid != cred->cr_ruid ||
2167 cred->cr_rgid != cred->cr_groups[0]))) {
2168 usecred = crdup(cred);
2169 usecred->cr_uid = cred->cr_ruid;
2170 usecred->cr_groups[0] = cred->cr_rgid;
2171 td->td_ucred = usecred;
2172 } else
2173 usecred = cred;
2174 AUDIT_ARG_VALUE(amode);
2175 NDINIT_ATRIGHTS(&nd, LOOKUP, LOCKSHARED | LOCKLEAF |
2176 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | AT_SYMLINK_NOFOLLOW |
2177 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights);
2178 if ((error = namei(&nd)) != 0)
2179 goto out;
2180 vp = nd.ni_vp;
2181
2182 error = vn_access(vp, amode, usecred, td);
2183 NDFREE_PNBUF(&nd);
2184 vput(vp);
2185 out:
2186 if (usecred != cred) {
2187 td->td_ucred = cred;
2188 crfree(usecred);
2189 }
2190 return (error);
2191 }
2192
2193 /*
2194 * Check access permissions using "effective" credentials.
2195 */
2196 #ifndef _SYS_SYSPROTO_H_
2197 struct eaccess_args {
2198 char *path;
2199 int amode;
2200 };
2201 #endif
2202 int
sys_eaccess(struct thread * td,struct eaccess_args * uap)2203 sys_eaccess(struct thread *td, struct eaccess_args *uap)
2204 {
2205
2206 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2207 AT_EACCESS, uap->amode));
2208 }
2209
2210 #if defined(COMPAT_43)
2211 /*
2212 * Get file status; this version follows links.
2213 */
2214 #ifndef _SYS_SYSPROTO_H_
2215 struct ostat_args {
2216 char *path;
2217 struct ostat *ub;
2218 };
2219 #endif
2220 int
ostat(struct thread * td,struct ostat_args * uap)2221 ostat(struct thread *td, struct ostat_args *uap)
2222 {
2223 struct stat sb;
2224 struct ostat osb;
2225 int error;
2226
2227 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb);
2228 if (error != 0)
2229 return (error);
2230 cvtstat(&sb, &osb);
2231 return (copyout(&osb, uap->ub, sizeof (osb)));
2232 }
2233
2234 /*
2235 * Get file status; this version does not follow links.
2236 */
2237 #ifndef _SYS_SYSPROTO_H_
2238 struct olstat_args {
2239 char *path;
2240 struct ostat *ub;
2241 };
2242 #endif
2243 int
olstat(struct thread * td,struct olstat_args * uap)2244 olstat(struct thread *td, struct olstat_args *uap)
2245 {
2246 struct stat sb;
2247 struct ostat osb;
2248 int error;
2249
2250 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2251 UIO_USERSPACE, &sb);
2252 if (error != 0)
2253 return (error);
2254 cvtstat(&sb, &osb);
2255 return (copyout(&osb, uap->ub, sizeof (osb)));
2256 }
2257
2258 /*
2259 * Convert from an old to a new stat structure.
2260 * XXX: many values are blindly truncated.
2261 */
2262 void
cvtstat(struct stat * st,struct ostat * ost)2263 cvtstat(struct stat *st, struct ostat *ost)
2264 {
2265
2266 bzero(ost, sizeof(*ost));
2267 ost->st_dev = st->st_dev;
2268 ost->st_ino = st->st_ino;
2269 ost->st_mode = st->st_mode;
2270 ost->st_nlink = st->st_nlink;
2271 ost->st_uid = st->st_uid;
2272 ost->st_gid = st->st_gid;
2273 ost->st_rdev = st->st_rdev;
2274 ost->st_size = MIN(st->st_size, INT32_MAX);
2275 ost->st_atim = st->st_atim;
2276 ost->st_mtim = st->st_mtim;
2277 ost->st_ctim = st->st_ctim;
2278 ost->st_blksize = st->st_blksize;
2279 ost->st_blocks = st->st_blocks;
2280 ost->st_flags = st->st_flags;
2281 ost->st_gen = st->st_gen;
2282 }
2283 #endif /* COMPAT_43 */
2284
2285 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
2286 int ino64_trunc_error;
2287 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW,
2288 &ino64_trunc_error, 0,
2289 "Error on truncation of device, file or inode number, or link count");
2290
2291 int
freebsd11_cvtstat(struct stat * st,struct freebsd11_stat * ost)2292 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost)
2293 {
2294
2295 ost->st_dev = st->st_dev;
2296 if (ost->st_dev != st->st_dev) {
2297 switch (ino64_trunc_error) {
2298 default:
2299 /*
2300 * Since dev_t is almost raw, don't clamp to the
2301 * maximum for case 2, but ignore the error.
2302 */
2303 break;
2304 case 1:
2305 return (EOVERFLOW);
2306 }
2307 }
2308 ost->st_ino = st->st_ino;
2309 if (ost->st_ino != st->st_ino) {
2310 switch (ino64_trunc_error) {
2311 default:
2312 case 0:
2313 break;
2314 case 1:
2315 return (EOVERFLOW);
2316 case 2:
2317 ost->st_ino = UINT32_MAX;
2318 break;
2319 }
2320 }
2321 ost->st_mode = st->st_mode;
2322 ost->st_nlink = st->st_nlink;
2323 if (ost->st_nlink != st->st_nlink) {
2324 switch (ino64_trunc_error) {
2325 default:
2326 case 0:
2327 break;
2328 case 1:
2329 return (EOVERFLOW);
2330 case 2:
2331 ost->st_nlink = UINT16_MAX;
2332 break;
2333 }
2334 }
2335 ost->st_uid = st->st_uid;
2336 ost->st_gid = st->st_gid;
2337 ost->st_rdev = st->st_rdev;
2338 if (ost->st_rdev != st->st_rdev) {
2339 switch (ino64_trunc_error) {
2340 default:
2341 break;
2342 case 1:
2343 return (EOVERFLOW);
2344 }
2345 }
2346 ost->st_atim = st->st_atim;
2347 ost->st_mtim = st->st_mtim;
2348 ost->st_ctim = st->st_ctim;
2349 ost->st_size = st->st_size;
2350 ost->st_blocks = st->st_blocks;
2351 ost->st_blksize = st->st_blksize;
2352 ost->st_flags = st->st_flags;
2353 ost->st_gen = st->st_gen;
2354 ost->st_lspare = 0;
2355 ost->st_birthtim = st->st_birthtim;
2356 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim),
2357 sizeof(*ost) - offsetof(struct freebsd11_stat,
2358 st_birthtim) - sizeof(ost->st_birthtim));
2359 return (0);
2360 }
2361
2362 int
freebsd11_stat(struct thread * td,struct freebsd11_stat_args * uap)2363 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap)
2364 {
2365 struct stat sb;
2366 struct freebsd11_stat osb;
2367 int error;
2368
2369 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb);
2370 if (error != 0)
2371 return (error);
2372 error = freebsd11_cvtstat(&sb, &osb);
2373 if (error == 0)
2374 error = copyout(&osb, uap->ub, sizeof(osb));
2375 return (error);
2376 }
2377
2378 int
freebsd11_lstat(struct thread * td,struct freebsd11_lstat_args * uap)2379 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap)
2380 {
2381 struct stat sb;
2382 struct freebsd11_stat osb;
2383 int error;
2384
2385 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2386 UIO_USERSPACE, &sb);
2387 if (error != 0)
2388 return (error);
2389 error = freebsd11_cvtstat(&sb, &osb);
2390 if (error == 0)
2391 error = copyout(&osb, uap->ub, sizeof(osb));
2392 return (error);
2393 }
2394
2395 int
freebsd11_fhstat(struct thread * td,struct freebsd11_fhstat_args * uap)2396 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap)
2397 {
2398 struct fhandle fh;
2399 struct stat sb;
2400 struct freebsd11_stat osb;
2401 int error;
2402
2403 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
2404 if (error != 0)
2405 return (error);
2406 error = kern_fhstat(td, fh, &sb);
2407 if (error != 0)
2408 return (error);
2409 error = freebsd11_cvtstat(&sb, &osb);
2410 if (error == 0)
2411 error = copyout(&osb, uap->sb, sizeof(osb));
2412 return (error);
2413 }
2414
2415 int
freebsd11_fstatat(struct thread * td,struct freebsd11_fstatat_args * uap)2416 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap)
2417 {
2418 struct stat sb;
2419 struct freebsd11_stat osb;
2420 int error;
2421
2422 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2423 UIO_USERSPACE, &sb);
2424 if (error != 0)
2425 return (error);
2426 error = freebsd11_cvtstat(&sb, &osb);
2427 if (error == 0)
2428 error = copyout(&osb, uap->buf, sizeof(osb));
2429 return (error);
2430 }
2431 #endif /* COMPAT_FREEBSD11 */
2432
2433 /*
2434 * Get file status
2435 */
2436 #ifndef _SYS_SYSPROTO_H_
2437 struct fstatat_args {
2438 int fd;
2439 char *path;
2440 struct stat *buf;
2441 int flag;
2442 }
2443 #endif
2444 int
sys_fstatat(struct thread * td,struct fstatat_args * uap)2445 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2446 {
2447 struct stat sb;
2448 int error;
2449
2450 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2451 UIO_USERSPACE, &sb);
2452 if (error == 0)
2453 error = copyout(&sb, uap->buf, sizeof (sb));
2454 return (error);
2455 }
2456
2457 int
kern_statat(struct thread * td,int flag,int fd,const char * path,enum uio_seg pathseg,struct stat * sbp)2458 kern_statat(struct thread *td, int flag, int fd, const char *path,
2459 enum uio_seg pathseg, struct stat *sbp)
2460 {
2461 struct nameidata nd;
2462 int error;
2463
2464 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2465 AT_EMPTY_PATH)) != 0)
2466 return (EINVAL);
2467
2468 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH |
2469 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF |
2470 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights);
2471
2472 if ((error = namei(&nd)) != 0) {
2473 if (error == ENOTDIR &&
2474 (nd.ni_resflags & NIRES_EMPTYPATH) != 0)
2475 error = kern_fstat(td, fd, sbp);
2476 return (error);
2477 }
2478 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED);
2479 NDFREE_PNBUF(&nd);
2480 vput(nd.ni_vp);
2481 #ifdef __STAT_TIME_T_EXT
2482 sbp->st_atim_ext = 0;
2483 sbp->st_mtim_ext = 0;
2484 sbp->st_ctim_ext = 0;
2485 sbp->st_btim_ext = 0;
2486 #endif
2487 #ifdef KTRACE
2488 if (KTRPOINT(td, KTR_STRUCT))
2489 ktrstat_error(sbp, error);
2490 #endif
2491 return (error);
2492 }
2493
2494 #if defined(COMPAT_FREEBSD11)
2495 /*
2496 * Implementation of the NetBSD [l]stat() functions.
2497 */
2498 int
freebsd11_cvtnstat(struct stat * sb,struct nstat * nsb)2499 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb)
2500 {
2501 struct freebsd11_stat sb11;
2502 int error;
2503
2504 error = freebsd11_cvtstat(sb, &sb11);
2505 if (error != 0)
2506 return (error);
2507
2508 bzero(nsb, sizeof(*nsb));
2509 CP(sb11, *nsb, st_dev);
2510 CP(sb11, *nsb, st_ino);
2511 CP(sb11, *nsb, st_mode);
2512 CP(sb11, *nsb, st_nlink);
2513 CP(sb11, *nsb, st_uid);
2514 CP(sb11, *nsb, st_gid);
2515 CP(sb11, *nsb, st_rdev);
2516 CP(sb11, *nsb, st_atim);
2517 CP(sb11, *nsb, st_mtim);
2518 CP(sb11, *nsb, st_ctim);
2519 CP(sb11, *nsb, st_size);
2520 CP(sb11, *nsb, st_blocks);
2521 CP(sb11, *nsb, st_blksize);
2522 CP(sb11, *nsb, st_flags);
2523 CP(sb11, *nsb, st_gen);
2524 CP(sb11, *nsb, st_birthtim);
2525 return (0);
2526 }
2527
2528 #ifndef _SYS_SYSPROTO_H_
2529 struct freebsd11_nstat_args {
2530 char *path;
2531 struct nstat *ub;
2532 };
2533 #endif
2534 int
freebsd11_nstat(struct thread * td,struct freebsd11_nstat_args * uap)2535 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap)
2536 {
2537 struct stat sb;
2538 struct nstat nsb;
2539 int error;
2540
2541 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb);
2542 if (error != 0)
2543 return (error);
2544 error = freebsd11_cvtnstat(&sb, &nsb);
2545 if (error == 0)
2546 error = copyout(&nsb, uap->ub, sizeof (nsb));
2547 return (error);
2548 }
2549
2550 /*
2551 * NetBSD lstat. Get file status; this version does not follow links.
2552 */
2553 #ifndef _SYS_SYSPROTO_H_
2554 struct freebsd11_nlstat_args {
2555 char *path;
2556 struct nstat *ub;
2557 };
2558 #endif
2559 int
freebsd11_nlstat(struct thread * td,struct freebsd11_nlstat_args * uap)2560 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap)
2561 {
2562 struct stat sb;
2563 struct nstat nsb;
2564 int error;
2565
2566 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2567 UIO_USERSPACE, &sb);
2568 if (error != 0)
2569 return (error);
2570 error = freebsd11_cvtnstat(&sb, &nsb);
2571 if (error == 0)
2572 error = copyout(&nsb, uap->ub, sizeof (nsb));
2573 return (error);
2574 }
2575 #endif /* COMPAT_FREEBSD11 */
2576
2577 /*
2578 * Get configurable pathname variables.
2579 */
2580 #ifndef _SYS_SYSPROTO_H_
2581 struct pathconf_args {
2582 char *path;
2583 int name;
2584 };
2585 #endif
2586 int
sys_pathconf(struct thread * td,struct pathconf_args * uap)2587 sys_pathconf(struct thread *td, struct pathconf_args *uap)
2588 {
2589 long value;
2590 int error;
2591
2592 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW,
2593 &value);
2594 if (error == 0)
2595 td->td_retval[0] = value;
2596 return (error);
2597 }
2598
2599 #ifndef _SYS_SYSPROTO_H_
2600 struct lpathconf_args {
2601 char *path;
2602 int name;
2603 };
2604 #endif
2605 int
sys_lpathconf(struct thread * td,struct lpathconf_args * uap)2606 sys_lpathconf(struct thread *td, struct lpathconf_args *uap)
2607 {
2608 long value;
2609 int error;
2610
2611 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2612 NOFOLLOW, &value);
2613 if (error == 0)
2614 td->td_retval[0] = value;
2615 return (error);
2616 }
2617
2618 int
kern_pathconf(struct thread * td,const char * path,enum uio_seg pathseg,int name,u_long flags,long * valuep)2619 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg,
2620 int name, u_long flags, long *valuep)
2621 {
2622 struct nameidata nd;
2623 int error;
2624
2625 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2626 pathseg, path);
2627 if ((error = namei(&nd)) != 0)
2628 return (error);
2629 NDFREE_PNBUF(&nd);
2630
2631 error = VOP_PATHCONF(nd.ni_vp, name, valuep);
2632 vput(nd.ni_vp);
2633 return (error);
2634 }
2635
2636 /*
2637 * Return target name of a symbolic link.
2638 */
2639 #ifndef _SYS_SYSPROTO_H_
2640 struct readlink_args {
2641 char *path;
2642 char *buf;
2643 size_t count;
2644 };
2645 #endif
2646 int
sys_readlink(struct thread * td,struct readlink_args * uap)2647 sys_readlink(struct thread *td, struct readlink_args *uap)
2648 {
2649
2650 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2651 uap->buf, UIO_USERSPACE, uap->count));
2652 }
2653 #ifndef _SYS_SYSPROTO_H_
2654 struct readlinkat_args {
2655 int fd;
2656 char *path;
2657 char *buf;
2658 size_t bufsize;
2659 };
2660 #endif
2661 int
sys_readlinkat(struct thread * td,struct readlinkat_args * uap)2662 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2663 {
2664
2665 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2666 uap->buf, UIO_USERSPACE, uap->bufsize));
2667 }
2668
2669 int
kern_readlinkat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2670 kern_readlinkat(struct thread *td, int fd, const char *path,
2671 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count)
2672 {
2673 struct vnode *vp;
2674 struct nameidata nd;
2675 int error;
2676
2677 if (count > IOSIZE_MAX)
2678 return (EINVAL);
2679
2680 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 |
2681 EMPTYPATH, pathseg, path, fd);
2682
2683 if ((error = namei(&nd)) != 0)
2684 return (error);
2685 NDFREE_PNBUF(&nd);
2686 vp = nd.ni_vp;
2687
2688 error = kern_readlink_vp(vp, buf, bufseg, count, td);
2689 vput(vp);
2690
2691 return (error);
2692 }
2693
2694 /*
2695 * Helper function to readlink from a vnode
2696 */
2697 static int
kern_readlink_vp(struct vnode * vp,char * buf,enum uio_seg bufseg,size_t count,struct thread * td)2698 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count,
2699 struct thread *td)
2700 {
2701 struct iovec aiov;
2702 struct uio auio;
2703 int error;
2704
2705 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked");
2706 #ifdef MAC
2707 error = mac_vnode_check_readlink(td->td_ucred, vp);
2708 if (error != 0)
2709 return (error);
2710 #endif
2711 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0)
2712 return (EINVAL);
2713
2714 aiov.iov_base = buf;
2715 aiov.iov_len = count;
2716 auio.uio_iov = &aiov;
2717 auio.uio_iovcnt = 1;
2718 auio.uio_offset = 0;
2719 auio.uio_rw = UIO_READ;
2720 auio.uio_segflg = bufseg;
2721 auio.uio_td = td;
2722 auio.uio_resid = count;
2723 error = VOP_READLINK(vp, &auio, td->td_ucred);
2724 td->td_retval[0] = count - auio.uio_resid;
2725 return (error);
2726 }
2727
2728 /*
2729 * Common implementation code for chflags() and fchflags().
2730 */
2731 static int
setfflags(struct thread * td,struct vnode * vp,u_long flags)2732 setfflags(struct thread *td, struct vnode *vp, u_long flags)
2733 {
2734 struct mount *mp;
2735 struct vattr vattr;
2736 int error;
2737
2738 /* We can't support the value matching VNOVAL. */
2739 if (flags == VNOVAL)
2740 return (EOPNOTSUPP);
2741
2742 /*
2743 * Prevent non-root users from setting flags on devices. When
2744 * a device is reused, users can retain ownership of the device
2745 * if they are allowed to set flags and programs assume that
2746 * chown can't fail when done as root.
2747 */
2748 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2749 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2750 if (error != 0)
2751 return (error);
2752 }
2753
2754 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2755 return (error);
2756 VATTR_NULL(&vattr);
2757 vattr.va_flags = flags;
2758 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2759 #ifdef MAC
2760 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2761 if (error == 0)
2762 #endif
2763 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2764 VOP_UNLOCK(vp);
2765 vn_finished_write(mp);
2766 return (error);
2767 }
2768
2769 /*
2770 * Change flags of a file given a path name.
2771 */
2772 #ifndef _SYS_SYSPROTO_H_
2773 struct chflags_args {
2774 const char *path;
2775 u_long flags;
2776 };
2777 #endif
2778 int
sys_chflags(struct thread * td,struct chflags_args * uap)2779 sys_chflags(struct thread *td, struct chflags_args *uap)
2780 {
2781
2782 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2783 uap->flags, 0));
2784 }
2785
2786 #ifndef _SYS_SYSPROTO_H_
2787 struct chflagsat_args {
2788 int fd;
2789 const char *path;
2790 u_long flags;
2791 int atflag;
2792 }
2793 #endif
2794 int
sys_chflagsat(struct thread * td,struct chflagsat_args * uap)2795 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2796 {
2797
2798 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE,
2799 uap->flags, uap->atflag));
2800 }
2801
2802 /*
2803 * Same as chflags() but doesn't follow symlinks.
2804 */
2805 #ifndef _SYS_SYSPROTO_H_
2806 struct lchflags_args {
2807 const char *path;
2808 u_long flags;
2809 };
2810 #endif
2811 int
sys_lchflags(struct thread * td,struct lchflags_args * uap)2812 sys_lchflags(struct thread *td, struct lchflags_args *uap)
2813 {
2814
2815 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2816 uap->flags, AT_SYMLINK_NOFOLLOW));
2817 }
2818
2819 static int
kern_chflagsat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,u_long flags,int atflag)2820 kern_chflagsat(struct thread *td, int fd, const char *path,
2821 enum uio_seg pathseg, u_long flags, int atflag)
2822 {
2823 struct nameidata nd;
2824 int error;
2825
2826 if ((atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2827 AT_EMPTY_PATH)) != 0)
2828 return (EINVAL);
2829
2830 AUDIT_ARG_FFLAGS(flags);
2831 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW |
2832 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
2833 fd, &cap_fchflags_rights);
2834 if ((error = namei(&nd)) != 0)
2835 return (error);
2836 NDFREE_PNBUF(&nd);
2837 error = setfflags(td, nd.ni_vp, flags);
2838 vrele(nd.ni_vp);
2839 return (error);
2840 }
2841
2842 /*
2843 * Change flags of a file given a file descriptor.
2844 */
2845 #ifndef _SYS_SYSPROTO_H_
2846 struct fchflags_args {
2847 int fd;
2848 u_long flags;
2849 };
2850 #endif
2851 int
sys_fchflags(struct thread * td,struct fchflags_args * uap)2852 sys_fchflags(struct thread *td, struct fchflags_args *uap)
2853 {
2854 struct file *fp;
2855 int error;
2856
2857 AUDIT_ARG_FD(uap->fd);
2858 AUDIT_ARG_FFLAGS(uap->flags);
2859 error = getvnode(td, uap->fd, &cap_fchflags_rights,
2860 &fp);
2861 if (error != 0)
2862 return (error);
2863 #ifdef AUDIT
2864 if (AUDITING_TD(td)) {
2865 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2866 AUDIT_ARG_VNODE1(fp->f_vnode);
2867 VOP_UNLOCK(fp->f_vnode);
2868 }
2869 #endif
2870 error = setfflags(td, fp->f_vnode, uap->flags);
2871 fdrop(fp, td);
2872 return (error);
2873 }
2874
2875 /*
2876 * Common implementation code for chmod(), lchmod() and fchmod().
2877 */
2878 int
setfmode(struct thread * td,struct ucred * cred,struct vnode * vp,int mode)2879 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode)
2880 {
2881 struct mount *mp;
2882 struct vattr vattr;
2883 int error;
2884
2885 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2886 return (error);
2887 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2888 VATTR_NULL(&vattr);
2889 vattr.va_mode = mode & ALLPERMS;
2890 #ifdef MAC
2891 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2892 if (error == 0)
2893 #endif
2894 error = VOP_SETATTR(vp, &vattr, cred);
2895 VOP_UNLOCK(vp);
2896 vn_finished_write(mp);
2897 return (error);
2898 }
2899
2900 /*
2901 * Change mode of a file given path name.
2902 */
2903 #ifndef _SYS_SYSPROTO_H_
2904 struct chmod_args {
2905 char *path;
2906 int mode;
2907 };
2908 #endif
2909 int
sys_chmod(struct thread * td,struct chmod_args * uap)2910 sys_chmod(struct thread *td, struct chmod_args *uap)
2911 {
2912
2913 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2914 uap->mode, 0));
2915 }
2916
2917 #ifndef _SYS_SYSPROTO_H_
2918 struct fchmodat_args {
2919 int dirfd;
2920 char *path;
2921 mode_t mode;
2922 int flag;
2923 }
2924 #endif
2925 int
sys_fchmodat(struct thread * td,struct fchmodat_args * uap)2926 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2927 {
2928
2929 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE,
2930 uap->mode, uap->flag));
2931 }
2932
2933 /*
2934 * Change mode of a file given path name (don't follow links.)
2935 */
2936 #ifndef _SYS_SYSPROTO_H_
2937 struct lchmod_args {
2938 char *path;
2939 int mode;
2940 };
2941 #endif
2942 int
sys_lchmod(struct thread * td,struct lchmod_args * uap)2943 sys_lchmod(struct thread *td, struct lchmod_args *uap)
2944 {
2945
2946 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2947 uap->mode, AT_SYMLINK_NOFOLLOW));
2948 }
2949
2950 int
kern_fchmodat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,mode_t mode,int flag)2951 kern_fchmodat(struct thread *td, int fd, const char *path,
2952 enum uio_seg pathseg, mode_t mode, int flag)
2953 {
2954 struct nameidata nd;
2955 int error;
2956
2957 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2958 AT_EMPTY_PATH)) != 0)
2959 return (EINVAL);
2960
2961 AUDIT_ARG_MODE(mode);
2962 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
2963 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
2964 fd, &cap_fchmod_rights);
2965 if ((error = namei(&nd)) != 0)
2966 return (error);
2967 NDFREE_PNBUF(&nd);
2968 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2969 vrele(nd.ni_vp);
2970 return (error);
2971 }
2972
2973 /*
2974 * Change mode of a file given a file descriptor.
2975 */
2976 #ifndef _SYS_SYSPROTO_H_
2977 struct fchmod_args {
2978 int fd;
2979 int mode;
2980 };
2981 #endif
2982 int
sys_fchmod(struct thread * td,struct fchmod_args * uap)2983 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2984 {
2985 struct file *fp;
2986 int error;
2987
2988 AUDIT_ARG_FD(uap->fd);
2989 AUDIT_ARG_MODE(uap->mode);
2990
2991 error = fget(td, uap->fd, &cap_fchmod_rights, &fp);
2992 if (error != 0)
2993 return (error);
2994 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2995 fdrop(fp, td);
2996 return (error);
2997 }
2998
2999 /*
3000 * Common implementation for chown(), lchown(), and fchown()
3001 */
3002 int
setfown(struct thread * td,struct ucred * cred,struct vnode * vp,uid_t uid,gid_t gid)3003 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
3004 gid_t gid)
3005 {
3006 struct mount *mp;
3007 struct vattr vattr;
3008 int error;
3009
3010 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
3011 return (error);
3012 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3013 VATTR_NULL(&vattr);
3014 vattr.va_uid = uid;
3015 vattr.va_gid = gid;
3016 #ifdef MAC
3017 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
3018 vattr.va_gid);
3019 if (error == 0)
3020 #endif
3021 error = VOP_SETATTR(vp, &vattr, cred);
3022 VOP_UNLOCK(vp);
3023 vn_finished_write(mp);
3024 return (error);
3025 }
3026
3027 /*
3028 * Set ownership given a path name.
3029 */
3030 #ifndef _SYS_SYSPROTO_H_
3031 struct chown_args {
3032 char *path;
3033 int uid;
3034 int gid;
3035 };
3036 #endif
3037 int
sys_chown(struct thread * td,struct chown_args * uap)3038 sys_chown(struct thread *td, struct chown_args *uap)
3039 {
3040
3041 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid,
3042 uap->gid, 0));
3043 }
3044
3045 #ifndef _SYS_SYSPROTO_H_
3046 struct fchownat_args {
3047 int fd;
3048 const char * path;
3049 uid_t uid;
3050 gid_t gid;
3051 int flag;
3052 };
3053 #endif
3054 int
sys_fchownat(struct thread * td,struct fchownat_args * uap)3055 sys_fchownat(struct thread *td, struct fchownat_args *uap)
3056 {
3057
3058 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
3059 uap->gid, uap->flag));
3060 }
3061
3062 int
kern_fchownat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int uid,int gid,int flag)3063 kern_fchownat(struct thread *td, int fd, const char *path,
3064 enum uio_seg pathseg, int uid, int gid, int flag)
3065 {
3066 struct nameidata nd;
3067 int error;
3068
3069 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3070 AT_EMPTY_PATH)) != 0)
3071 return (EINVAL);
3072
3073 AUDIT_ARG_OWNER(uid, gid);
3074 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3075 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
3076 fd, &cap_fchown_rights);
3077
3078 if ((error = namei(&nd)) != 0)
3079 return (error);
3080 NDFREE_PNBUF(&nd);
3081 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
3082 vrele(nd.ni_vp);
3083 return (error);
3084 }
3085
3086 /*
3087 * Set ownership given a path name, do not cross symlinks.
3088 */
3089 #ifndef _SYS_SYSPROTO_H_
3090 struct lchown_args {
3091 char *path;
3092 int uid;
3093 int gid;
3094 };
3095 #endif
3096 int
sys_lchown(struct thread * td,struct lchown_args * uap)3097 sys_lchown(struct thread *td, struct lchown_args *uap)
3098 {
3099
3100 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3101 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
3102 }
3103
3104 /*
3105 * Set ownership given a file descriptor.
3106 */
3107 #ifndef _SYS_SYSPROTO_H_
3108 struct fchown_args {
3109 int fd;
3110 int uid;
3111 int gid;
3112 };
3113 #endif
3114 int
sys_fchown(struct thread * td,struct fchown_args * uap)3115 sys_fchown(struct thread *td, struct fchown_args *uap)
3116 {
3117 struct file *fp;
3118 int error;
3119
3120 AUDIT_ARG_FD(uap->fd);
3121 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3122 error = fget(td, uap->fd, &cap_fchown_rights, &fp);
3123 if (error != 0)
3124 return (error);
3125 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3126 fdrop(fp, td);
3127 return (error);
3128 }
3129
3130 /*
3131 * Common implementation code for utimes(), lutimes(), and futimes().
3132 */
3133 static int
getutimes(const struct timeval * usrtvp,enum uio_seg tvpseg,struct timespec * tsp)3134 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg,
3135 struct timespec *tsp)
3136 {
3137 struct timeval tv[2];
3138 const struct timeval *tvp;
3139 int error;
3140
3141 if (usrtvp == NULL) {
3142 vfs_timestamp(&tsp[0]);
3143 tsp[1] = tsp[0];
3144 } else {
3145 if (tvpseg == UIO_SYSSPACE) {
3146 tvp = usrtvp;
3147 } else {
3148 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3149 return (error);
3150 tvp = tv;
3151 }
3152
3153 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3154 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3155 return (EINVAL);
3156 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3157 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3158 }
3159 return (0);
3160 }
3161
3162 /*
3163 * Common implementation code for futimens(), utimensat().
3164 */
3165 #define UTIMENS_NULL 0x1
3166 #define UTIMENS_EXIT 0x2
3167 static int
getutimens(const struct timespec * usrtsp,enum uio_seg tspseg,struct timespec * tsp,int * retflags)3168 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
3169 struct timespec *tsp, int *retflags)
3170 {
3171 struct timespec tsnow;
3172 int error;
3173
3174 vfs_timestamp(&tsnow);
3175 *retflags = 0;
3176 if (usrtsp == NULL) {
3177 tsp[0] = tsnow;
3178 tsp[1] = tsnow;
3179 *retflags |= UTIMENS_NULL;
3180 return (0);
3181 }
3182 if (tspseg == UIO_SYSSPACE) {
3183 tsp[0] = usrtsp[0];
3184 tsp[1] = usrtsp[1];
3185 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
3186 return (error);
3187 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
3188 *retflags |= UTIMENS_EXIT;
3189 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
3190 *retflags |= UTIMENS_NULL;
3191 if (tsp[0].tv_nsec == UTIME_OMIT)
3192 tsp[0].tv_sec = VNOVAL;
3193 else if (tsp[0].tv_nsec == UTIME_NOW)
3194 tsp[0] = tsnow;
3195 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
3196 return (EINVAL);
3197 if (tsp[1].tv_nsec == UTIME_OMIT)
3198 tsp[1].tv_sec = VNOVAL;
3199 else if (tsp[1].tv_nsec == UTIME_NOW)
3200 tsp[1] = tsnow;
3201 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
3202 return (EINVAL);
3203
3204 return (0);
3205 }
3206
3207 /*
3208 * Common implementation code for utimes(), lutimes(), futimes(), futimens(),
3209 * and utimensat().
3210 */
3211 static int
setutimes(struct thread * td,struct vnode * vp,const struct timespec * ts,int numtimes,int nullflag)3212 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts,
3213 int numtimes, int nullflag)
3214 {
3215 struct mount *mp;
3216 struct vattr vattr;
3217 int error;
3218 bool setbirthtime;
3219
3220 setbirthtime = false;
3221 vattr.va_birthtime.tv_sec = VNOVAL;
3222 vattr.va_birthtime.tv_nsec = 0;
3223
3224 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
3225 return (error);
3226 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3227 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 &&
3228 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3229 setbirthtime = true;
3230 VATTR_NULL(&vattr);
3231 vattr.va_atime = ts[0];
3232 vattr.va_mtime = ts[1];
3233 if (setbirthtime)
3234 vattr.va_birthtime = ts[1];
3235 if (numtimes > 2)
3236 vattr.va_birthtime = ts[2];
3237 if (nullflag)
3238 vattr.va_vaflags |= VA_UTIMES_NULL;
3239 #ifdef MAC
3240 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3241 vattr.va_mtime);
3242 #endif
3243 if (error == 0)
3244 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3245 VOP_UNLOCK(vp);
3246 vn_finished_write(mp);
3247 return (error);
3248 }
3249
3250 /*
3251 * Set the access and modification times of a file.
3252 */
3253 #ifndef _SYS_SYSPROTO_H_
3254 struct utimes_args {
3255 char *path;
3256 struct timeval *tptr;
3257 };
3258 #endif
3259 int
sys_utimes(struct thread * td,struct utimes_args * uap)3260 sys_utimes(struct thread *td, struct utimes_args *uap)
3261 {
3262
3263 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3264 uap->tptr, UIO_USERSPACE));
3265 }
3266
3267 #ifndef _SYS_SYSPROTO_H_
3268 struct futimesat_args {
3269 int fd;
3270 const char * path;
3271 const struct timeval * times;
3272 };
3273 #endif
3274 int
sys_futimesat(struct thread * td,struct futimesat_args * uap)3275 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3276 {
3277
3278 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3279 uap->times, UIO_USERSPACE));
3280 }
3281
3282 int
kern_utimesat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,const struct timeval * tptr,enum uio_seg tptrseg)3283 kern_utimesat(struct thread *td, int fd, const char *path,
3284 enum uio_seg pathseg, const struct timeval *tptr, enum uio_seg tptrseg)
3285 {
3286 struct nameidata nd;
3287 struct timespec ts[2];
3288 int error;
3289
3290 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3291 return (error);
3292 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3293 &cap_futimes_rights);
3294
3295 if ((error = namei(&nd)) != 0)
3296 return (error);
3297 NDFREE_PNBUF(&nd);
3298 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3299 vrele(nd.ni_vp);
3300 return (error);
3301 }
3302
3303 /*
3304 * Set the access and modification times of a file.
3305 */
3306 #ifndef _SYS_SYSPROTO_H_
3307 struct lutimes_args {
3308 char *path;
3309 struct timeval *tptr;
3310 };
3311 #endif
3312 int
sys_lutimes(struct thread * td,struct lutimes_args * uap)3313 sys_lutimes(struct thread *td, struct lutimes_args *uap)
3314 {
3315
3316 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3317 UIO_USERSPACE));
3318 }
3319
3320 int
kern_lutimes(struct thread * td,const char * path,enum uio_seg pathseg,const struct timeval * tptr,enum uio_seg tptrseg)3321 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg,
3322 const struct timeval *tptr, enum uio_seg tptrseg)
3323 {
3324 struct timespec ts[2];
3325 struct nameidata nd;
3326 int error;
3327
3328 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3329 return (error);
3330 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path);
3331 if ((error = namei(&nd)) != 0)
3332 return (error);
3333 NDFREE_PNBUF(&nd);
3334 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3335 vrele(nd.ni_vp);
3336 return (error);
3337 }
3338
3339 /*
3340 * Set the access and modification times of a file.
3341 */
3342 #ifndef _SYS_SYSPROTO_H_
3343 struct futimes_args {
3344 int fd;
3345 struct timeval *tptr;
3346 };
3347 #endif
3348 int
sys_futimes(struct thread * td,struct futimes_args * uap)3349 sys_futimes(struct thread *td, struct futimes_args *uap)
3350 {
3351
3352 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3353 }
3354
3355 int
kern_futimes(struct thread * td,int fd,const struct timeval * tptr,enum uio_seg tptrseg)3356 kern_futimes(struct thread *td, int fd, const struct timeval *tptr,
3357 enum uio_seg tptrseg)
3358 {
3359 struct timespec ts[2];
3360 struct file *fp;
3361 int error;
3362
3363 AUDIT_ARG_FD(fd);
3364 error = getutimes(tptr, tptrseg, ts);
3365 if (error != 0)
3366 return (error);
3367 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3368 if (error != 0)
3369 return (error);
3370 #ifdef AUDIT
3371 if (AUDITING_TD(td)) {
3372 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3373 AUDIT_ARG_VNODE1(fp->f_vnode);
3374 VOP_UNLOCK(fp->f_vnode);
3375 }
3376 #endif
3377 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3378 fdrop(fp, td);
3379 return (error);
3380 }
3381
3382 int
sys_futimens(struct thread * td,struct futimens_args * uap)3383 sys_futimens(struct thread *td, struct futimens_args *uap)
3384 {
3385
3386 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
3387 }
3388
3389 int
kern_futimens(struct thread * td,int fd,const struct timespec * tptr,enum uio_seg tptrseg)3390 kern_futimens(struct thread *td, int fd, const struct timespec *tptr,
3391 enum uio_seg tptrseg)
3392 {
3393 struct timespec ts[2];
3394 struct file *fp;
3395 int error, flags;
3396
3397 AUDIT_ARG_FD(fd);
3398 error = getutimens(tptr, tptrseg, ts, &flags);
3399 if (error != 0)
3400 return (error);
3401 if (flags & UTIMENS_EXIT)
3402 return (0);
3403 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3404 if (error != 0)
3405 return (error);
3406 #ifdef AUDIT
3407 if (AUDITING_TD(td)) {
3408 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3409 AUDIT_ARG_VNODE1(fp->f_vnode);
3410 VOP_UNLOCK(fp->f_vnode);
3411 }
3412 #endif
3413 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
3414 fdrop(fp, td);
3415 return (error);
3416 }
3417
3418 int
sys_utimensat(struct thread * td,struct utimensat_args * uap)3419 sys_utimensat(struct thread *td, struct utimensat_args *uap)
3420 {
3421
3422 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
3423 uap->times, UIO_USERSPACE, uap->flag));
3424 }
3425
3426 int
kern_utimensat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,const struct timespec * tptr,enum uio_seg tptrseg,int flag)3427 kern_utimensat(struct thread *td, int fd, const char *path,
3428 enum uio_seg pathseg, const struct timespec *tptr, enum uio_seg tptrseg,
3429 int flag)
3430 {
3431 struct nameidata nd;
3432 struct timespec ts[2];
3433 int error, flags;
3434
3435 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3436 AT_EMPTY_PATH)) != 0)
3437 return (EINVAL);
3438
3439 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
3440 return (error);
3441 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3442 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1,
3443 pathseg, path, fd, &cap_futimes_rights);
3444 if ((error = namei(&nd)) != 0)
3445 return (error);
3446 /*
3447 * We are allowed to call namei() regardless of 2xUTIME_OMIT.
3448 * POSIX states:
3449 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
3450 * "Search permission is denied by a component of the path prefix."
3451 */
3452 NDFREE_PNBUF(&nd);
3453 if ((flags & UTIMENS_EXIT) == 0)
3454 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
3455 vrele(nd.ni_vp);
3456 return (error);
3457 }
3458
3459 /*
3460 * Truncate a file given its path name.
3461 */
3462 #ifndef _SYS_SYSPROTO_H_
3463 struct truncate_args {
3464 char *path;
3465 int pad;
3466 off_t length;
3467 };
3468 #endif
3469 int
sys_truncate(struct thread * td,struct truncate_args * uap)3470 sys_truncate(struct thread *td, struct truncate_args *uap)
3471 {
3472
3473 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3474 }
3475
3476 int
kern_truncate(struct thread * td,const char * path,enum uio_seg pathseg,off_t length)3477 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg,
3478 off_t length)
3479 {
3480 struct mount *mp;
3481 struct vnode *vp;
3482 void *rl_cookie;
3483 struct nameidata nd;
3484 int error;
3485
3486 if (length < 0)
3487 return (EINVAL);
3488 NDPREINIT(&nd);
3489 retry:
3490 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path);
3491 if ((error = namei(&nd)) != 0)
3492 return (error);
3493 vp = nd.ni_vp;
3494 NDFREE_PNBUF(&nd);
3495 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3496 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
3497 vn_rangelock_unlock(vp, rl_cookie);
3498 vrele(vp);
3499 return (error);
3500 }
3501 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3502 if (vp->v_type == VDIR) {
3503 error = EISDIR;
3504 goto out;
3505 }
3506 #ifdef MAC
3507 error = mac_vnode_check_write(td->td_ucred, NOCRED, vp);
3508 if (error != 0)
3509 goto out;
3510 #endif
3511 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
3512 if (error != 0)
3513 goto out;
3514
3515 error = vn_truncate_locked(vp, length, false, td->td_ucred);
3516 out:
3517 VOP_UNLOCK(vp);
3518 vn_finished_write(mp);
3519 vn_rangelock_unlock(vp, rl_cookie);
3520 vrele(vp);
3521 if (error == ERELOOKUP)
3522 goto retry;
3523 return (error);
3524 }
3525
3526 #if defined(COMPAT_43)
3527 /*
3528 * Truncate a file given its path name.
3529 */
3530 #ifndef _SYS_SYSPROTO_H_
3531 struct otruncate_args {
3532 char *path;
3533 long length;
3534 };
3535 #endif
3536 int
otruncate(struct thread * td,struct otruncate_args * uap)3537 otruncate(struct thread *td, struct otruncate_args *uap)
3538 {
3539
3540 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3541 }
3542 #endif /* COMPAT_43 */
3543
3544 #if defined(COMPAT_FREEBSD6)
3545 /* Versions with the pad argument */
3546 int
freebsd6_truncate(struct thread * td,struct freebsd6_truncate_args * uap)3547 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3548 {
3549
3550 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3551 }
3552
3553 int
freebsd6_ftruncate(struct thread * td,struct freebsd6_ftruncate_args * uap)3554 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3555 {
3556
3557 return (kern_ftruncate(td, uap->fd, uap->length));
3558 }
3559 #endif
3560
3561 int
kern_fsync(struct thread * td,int fd,bool fullsync)3562 kern_fsync(struct thread *td, int fd, bool fullsync)
3563 {
3564 struct vnode *vp;
3565 struct mount *mp;
3566 struct file *fp;
3567 int error;
3568
3569 AUDIT_ARG_FD(fd);
3570 error = getvnode(td, fd, &cap_fsync_rights, &fp);
3571 if (error != 0)
3572 return (error);
3573 vp = fp->f_vnode;
3574 #if 0
3575 if (!fullsync)
3576 /* XXXKIB: compete outstanding aio writes */;
3577 #endif
3578 retry:
3579 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH);
3580 if (error != 0)
3581 goto drop;
3582 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY);
3583 AUDIT_ARG_VNODE1(vp);
3584 vnode_pager_clean_async(vp);
3585 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td);
3586 VOP_UNLOCK(vp);
3587 vn_finished_write(mp);
3588 if (error == ERELOOKUP)
3589 goto retry;
3590 drop:
3591 fdrop(fp, td);
3592 return (error);
3593 }
3594
3595 /*
3596 * Sync an open file.
3597 */
3598 #ifndef _SYS_SYSPROTO_H_
3599 struct fsync_args {
3600 int fd;
3601 };
3602 #endif
3603 int
sys_fsync(struct thread * td,struct fsync_args * uap)3604 sys_fsync(struct thread *td, struct fsync_args *uap)
3605 {
3606
3607 return (kern_fsync(td, uap->fd, true));
3608 }
3609
3610 int
sys_fdatasync(struct thread * td,struct fdatasync_args * uap)3611 sys_fdatasync(struct thread *td, struct fdatasync_args *uap)
3612 {
3613
3614 return (kern_fsync(td, uap->fd, false));
3615 }
3616
3617 /*
3618 * Rename files. Source and destination must either both be directories, or
3619 * both not be directories. If target is a directory, it must be empty.
3620 */
3621 #ifndef _SYS_SYSPROTO_H_
3622 struct rename_args {
3623 char *from;
3624 char *to;
3625 };
3626 #endif
3627 int
sys_rename(struct thread * td,struct rename_args * uap)3628 sys_rename(struct thread *td, struct rename_args *uap)
3629 {
3630
3631 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
3632 uap->to, UIO_USERSPACE));
3633 }
3634
3635 #ifndef _SYS_SYSPROTO_H_
3636 struct renameat_args {
3637 int oldfd;
3638 char *old;
3639 int newfd;
3640 char *new;
3641 };
3642 #endif
3643 int
sys_renameat(struct thread * td,struct renameat_args * uap)3644 sys_renameat(struct thread *td, struct renameat_args *uap)
3645 {
3646
3647 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3648 UIO_USERSPACE));
3649 }
3650
3651 #ifdef MAC
3652 static int
kern_renameat_mac(struct thread * td,int oldfd,const char * old,int newfd,const char * new,enum uio_seg pathseg,struct nameidata * fromnd)3653 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd,
3654 const char *new, enum uio_seg pathseg, struct nameidata *fromnd)
3655 {
3656 int error;
3657
3658 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3659 pathseg, old, oldfd, &cap_renameat_source_rights);
3660 if ((error = namei(fromnd)) != 0)
3661 return (error);
3662 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp,
3663 fromnd->ni_vp, &fromnd->ni_cnd);
3664 VOP_UNLOCK(fromnd->ni_dvp);
3665 if (fromnd->ni_dvp != fromnd->ni_vp)
3666 VOP_UNLOCK(fromnd->ni_vp);
3667 if (error != 0) {
3668 NDFREE_PNBUF(fromnd);
3669 vrele(fromnd->ni_dvp);
3670 vrele(fromnd->ni_vp);
3671 }
3672 return (error);
3673 }
3674 #endif
3675
3676 int
kern_renameat(struct thread * td,int oldfd,const char * old,int newfd,const char * new,enum uio_seg pathseg)3677 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd,
3678 const char *new, enum uio_seg pathseg)
3679 {
3680 struct mount *mp = NULL;
3681 struct vnode *tvp, *fvp, *tdvp;
3682 struct nameidata fromnd, tond;
3683 uint64_t tondflags;
3684 int error;
3685
3686 again:
3687 bwillwrite();
3688 #ifdef MAC
3689 if (mac_vnode_check_rename_from_enabled()) {
3690 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg,
3691 &fromnd);
3692 if (error != 0)
3693 return (error);
3694 } else {
3695 #endif
3696 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | AUDITVNODE1,
3697 pathseg, old, oldfd, &cap_renameat_source_rights);
3698 if ((error = namei(&fromnd)) != 0)
3699 return (error);
3700 #ifdef MAC
3701 }
3702 #endif
3703 fvp = fromnd.ni_vp;
3704 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | AUDITVNODE2;
3705 if (fromnd.ni_vp->v_type == VDIR)
3706 tondflags |= WILLBEDIR;
3707 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd,
3708 &cap_renameat_target_rights);
3709 if ((error = namei(&tond)) != 0) {
3710 /* Translate error code for rename("dir1", "dir2/."). */
3711 if (error == EISDIR && fvp->v_type == VDIR)
3712 error = EINVAL;
3713 NDFREE_PNBUF(&fromnd);
3714 vrele(fromnd.ni_dvp);
3715 vrele(fvp);
3716 goto out1;
3717 }
3718 tdvp = tond.ni_dvp;
3719 tvp = tond.ni_vp;
3720 error = vn_start_write(fvp, &mp, V_NOWAIT);
3721 if (error != 0) {
3722 NDFREE_PNBUF(&fromnd);
3723 NDFREE_PNBUF(&tond);
3724 if (tvp != NULL)
3725 vput(tvp);
3726 if (tdvp == tvp)
3727 vrele(tdvp);
3728 else
3729 vput(tdvp);
3730 vrele(fromnd.ni_dvp);
3731 vrele(fvp);
3732 error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH);
3733 if (error != 0)
3734 return (error);
3735 goto again;
3736 }
3737 if (tvp != NULL) {
3738 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3739 error = ENOTDIR;
3740 goto out;
3741 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3742 error = EISDIR;
3743 goto out;
3744 }
3745 #ifdef CAPABILITIES
3746 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) {
3747 /*
3748 * If the target already exists we require CAP_UNLINKAT
3749 * from 'newfd', when newfd was used for the lookup.
3750 */
3751 error = cap_check(&tond.ni_filecaps.fc_rights,
3752 &cap_unlinkat_rights);
3753 if (error != 0)
3754 goto out;
3755 }
3756 #endif
3757 }
3758 if (fvp == tdvp) {
3759 error = EINVAL;
3760 goto out;
3761 }
3762 /*
3763 * If the source is the same as the destination (that is, if they
3764 * are links to the same vnode), then there is nothing to do.
3765 */
3766 if (fvp == tvp)
3767 error = ERESTART;
3768 #ifdef MAC
3769 else
3770 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3771 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3772 #endif
3773 out:
3774 if (error == 0) {
3775 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3776 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3777 NDFREE_PNBUF(&fromnd);
3778 NDFREE_PNBUF(&tond);
3779 } else {
3780 NDFREE_PNBUF(&fromnd);
3781 NDFREE_PNBUF(&tond);
3782 if (tvp != NULL)
3783 vput(tvp);
3784 if (tdvp == tvp)
3785 vrele(tdvp);
3786 else
3787 vput(tdvp);
3788 vrele(fromnd.ni_dvp);
3789 vrele(fvp);
3790 }
3791 vn_finished_write(mp);
3792 out1:
3793 if (error == ERESTART)
3794 return (0);
3795 if (error == ERELOOKUP)
3796 goto again;
3797 return (error);
3798 }
3799
3800 /*
3801 * Make a directory file.
3802 */
3803 #ifndef _SYS_SYSPROTO_H_
3804 struct mkdir_args {
3805 char *path;
3806 int mode;
3807 };
3808 #endif
3809 int
sys_mkdir(struct thread * td,struct mkdir_args * uap)3810 sys_mkdir(struct thread *td, struct mkdir_args *uap)
3811 {
3812
3813 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3814 uap->mode));
3815 }
3816
3817 #ifndef _SYS_SYSPROTO_H_
3818 struct mkdirat_args {
3819 int fd;
3820 char *path;
3821 mode_t mode;
3822 };
3823 #endif
3824 int
sys_mkdirat(struct thread * td,struct mkdirat_args * uap)3825 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3826 {
3827
3828 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3829 }
3830
3831 int
kern_mkdirat(struct thread * td,int fd,const char * path,enum uio_seg segflg,int mode)3832 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg,
3833 int mode)
3834 {
3835 struct mount *mp;
3836 struct vattr vattr;
3837 struct nameidata nd;
3838 int error;
3839
3840 AUDIT_ARG_MODE(mode);
3841 NDPREINIT(&nd);
3842 restart:
3843 bwillwrite();
3844 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 |
3845 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR,
3846 segflg, path, fd, &cap_mkdirat_rights);
3847 if ((error = namei(&nd)) != 0)
3848 return (error);
3849 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3850 NDFREE_PNBUF(&nd);
3851 vput(nd.ni_dvp);
3852 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
3853 return (error);
3854 goto restart;
3855 }
3856 VATTR_NULL(&vattr);
3857 vattr.va_type = VDIR;
3858 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask;
3859 #ifdef MAC
3860 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3861 &vattr);
3862 if (error != 0)
3863 goto out;
3864 #endif
3865 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3866 #ifdef MAC
3867 out:
3868 #endif
3869 NDFREE_PNBUF(&nd);
3870 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
3871 vn_finished_write(mp);
3872 if (error == ERELOOKUP)
3873 goto restart;
3874 return (error);
3875 }
3876
3877 /*
3878 * Remove a directory file.
3879 */
3880 #ifndef _SYS_SYSPROTO_H_
3881 struct rmdir_args {
3882 char *path;
3883 };
3884 #endif
3885 int
sys_rmdir(struct thread * td,struct rmdir_args * uap)3886 sys_rmdir(struct thread *td, struct rmdir_args *uap)
3887 {
3888
3889 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
3890 0));
3891 }
3892
3893 int
kern_frmdirat(struct thread * td,int dfd,const char * path,int fd,enum uio_seg pathseg,int flag)3894 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd,
3895 enum uio_seg pathseg, int flag)
3896 {
3897 struct mount *mp;
3898 struct vnode *vp;
3899 struct file *fp;
3900 struct nameidata nd;
3901 cap_rights_t rights;
3902 int error;
3903
3904 fp = NULL;
3905 if (fd != FD_NONE) {
3906 error = getvnode(td, fd, cap_rights_init_one(&rights,
3907 CAP_LOOKUP), &fp);
3908 if (error != 0)
3909 return (error);
3910 }
3911
3912 NDPREINIT(&nd);
3913 restart:
3914 bwillwrite();
3915 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
3916 at2cnpflags(flag, AT_RESOLVE_BENEATH),
3917 pathseg, path, dfd, &cap_unlinkat_rights);
3918 if ((error = namei(&nd)) != 0)
3919 goto fdout;
3920 vp = nd.ni_vp;
3921 if (vp->v_type != VDIR) {
3922 error = ENOTDIR;
3923 goto out;
3924 }
3925 /*
3926 * No rmdir "." please.
3927 */
3928 if (nd.ni_dvp == vp) {
3929 error = EINVAL;
3930 goto out;
3931 }
3932 /*
3933 * The root of a mounted filesystem cannot be deleted.
3934 */
3935 if (vp->v_vflag & VV_ROOT) {
3936 error = EBUSY;
3937 goto out;
3938 }
3939
3940 if (fp != NULL && fp->f_vnode != vp) {
3941 if (VN_IS_DOOMED(fp->f_vnode))
3942 error = EBADF;
3943 else
3944 error = EDEADLK;
3945 goto out;
3946 }
3947
3948 #ifdef MAC
3949 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3950 &nd.ni_cnd);
3951 if (error != 0)
3952 goto out;
3953 #endif
3954 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3955 NDFREE_PNBUF(&nd);
3956 vput(vp);
3957 if (nd.ni_dvp == vp)
3958 vrele(nd.ni_dvp);
3959 else
3960 vput(nd.ni_dvp);
3961 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
3962 goto fdout;
3963 goto restart;
3964 }
3965 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3966 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3967 vn_finished_write(mp);
3968 out:
3969 NDFREE_PNBUF(&nd);
3970 vput(vp);
3971 if (nd.ni_dvp == vp)
3972 vrele(nd.ni_dvp);
3973 else
3974 vput(nd.ni_dvp);
3975 if (error == ERELOOKUP)
3976 goto restart;
3977 fdout:
3978 if (fp != NULL)
3979 fdrop(fp, td);
3980 return (error);
3981 }
3982
3983 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
3984 int
freebsd11_kern_getdirentries(struct thread * td,int fd,char * ubuf,u_int count,long * basep,void (* func)(struct freebsd11_dirent *))3985 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count,
3986 long *basep, void (*func)(struct freebsd11_dirent *))
3987 {
3988 struct freebsd11_dirent dstdp;
3989 struct dirent *dp, *edp;
3990 char *dirbuf;
3991 off_t base;
3992 ssize_t resid, ucount;
3993 int error;
3994
3995 /* XXX arbitrary sanity limit on `count'. */
3996 count = min(count, 64 * 1024);
3997
3998 dirbuf = malloc(count, M_TEMP, M_WAITOK);
3999
4000 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid,
4001 UIO_SYSSPACE);
4002 if (error != 0)
4003 goto done;
4004 if (basep != NULL)
4005 *basep = base;
4006
4007 ucount = 0;
4008 for (dp = (struct dirent *)dirbuf,
4009 edp = (struct dirent *)&dirbuf[count - resid];
4010 ucount < count && dp < edp; ) {
4011 if (dp->d_reclen == 0)
4012 break;
4013 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0));
4014 if (dp->d_namlen >= sizeof(dstdp.d_name))
4015 continue;
4016 dstdp.d_type = dp->d_type;
4017 dstdp.d_namlen = dp->d_namlen;
4018 dstdp.d_fileno = dp->d_fileno; /* truncate */
4019 if (dstdp.d_fileno != dp->d_fileno) {
4020 switch (ino64_trunc_error) {
4021 default:
4022 case 0:
4023 break;
4024 case 1:
4025 error = EOVERFLOW;
4026 goto done;
4027 case 2:
4028 dstdp.d_fileno = UINT32_MAX;
4029 break;
4030 }
4031 }
4032 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) +
4033 ((dp->d_namlen + 1 + 3) &~ 3);
4034 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
4035 bzero(dstdp.d_name + dstdp.d_namlen,
4036 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) -
4037 dstdp.d_namlen);
4038 MPASS(dstdp.d_reclen <= dp->d_reclen);
4039 MPASS(ucount + dstdp.d_reclen <= count);
4040 if (func != NULL)
4041 func(&dstdp);
4042 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen);
4043 if (error != 0)
4044 break;
4045 dp = (struct dirent *)((char *)dp + dp->d_reclen);
4046 ucount += dstdp.d_reclen;
4047 }
4048
4049 done:
4050 free(dirbuf, M_TEMP);
4051 if (error == 0)
4052 td->td_retval[0] = ucount;
4053 return (error);
4054 }
4055 #endif /* COMPAT */
4056
4057 #ifdef COMPAT_43
4058 static void
ogetdirentries_cvt(struct freebsd11_dirent * dp)4059 ogetdirentries_cvt(struct freebsd11_dirent *dp)
4060 {
4061 #if (BYTE_ORDER == LITTLE_ENDIAN)
4062 /*
4063 * The expected low byte of dp->d_namlen is our dp->d_type.
4064 * The high MBZ byte of dp->d_namlen is our dp->d_namlen.
4065 */
4066 dp->d_type = dp->d_namlen;
4067 dp->d_namlen = 0;
4068 #else
4069 /*
4070 * The dp->d_type is the high byte of the expected dp->d_namlen,
4071 * so must be zero'ed.
4072 */
4073 dp->d_type = 0;
4074 #endif
4075 }
4076
4077 /*
4078 * Read a block of directory entries in a filesystem independent format.
4079 */
4080 #ifndef _SYS_SYSPROTO_H_
4081 struct ogetdirentries_args {
4082 int fd;
4083 char *buf;
4084 u_int count;
4085 long *basep;
4086 };
4087 #endif
4088 int
ogetdirentries(struct thread * td,struct ogetdirentries_args * uap)4089 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
4090 {
4091 long loff;
4092 int error;
4093
4094 error = kern_ogetdirentries(td, uap, &loff);
4095 if (error == 0)
4096 error = copyout(&loff, uap->basep, sizeof(long));
4097 return (error);
4098 }
4099
4100 int
kern_ogetdirentries(struct thread * td,struct ogetdirentries_args * uap,long * ploff)4101 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
4102 long *ploff)
4103 {
4104 long base;
4105 int error;
4106
4107 /* XXX arbitrary sanity limit on `count'. */
4108 if (uap->count > 64 * 1024)
4109 return (EINVAL);
4110
4111 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
4112 &base, ogetdirentries_cvt);
4113
4114 if (error == 0 && uap->basep != NULL)
4115 error = copyout(&base, uap->basep, sizeof(long));
4116
4117 return (error);
4118 }
4119 #endif /* COMPAT_43 */
4120
4121 #if defined(COMPAT_FREEBSD11)
4122 #ifndef _SYS_SYSPROTO_H_
4123 struct freebsd11_getdirentries_args {
4124 int fd;
4125 char *buf;
4126 u_int count;
4127 long *basep;
4128 };
4129 #endif
4130 int
freebsd11_getdirentries(struct thread * td,struct freebsd11_getdirentries_args * uap)4131 freebsd11_getdirentries(struct thread *td,
4132 struct freebsd11_getdirentries_args *uap)
4133 {
4134 long base;
4135 int error;
4136
4137 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
4138 &base, NULL);
4139
4140 if (error == 0 && uap->basep != NULL)
4141 error = copyout(&base, uap->basep, sizeof(long));
4142 return (error);
4143 }
4144
4145 int
freebsd11_getdents(struct thread * td,struct freebsd11_getdents_args * uap)4146 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap)
4147 {
4148 struct freebsd11_getdirentries_args ap;
4149
4150 ap.fd = uap->fd;
4151 ap.buf = uap->buf;
4152 ap.count = uap->count;
4153 ap.basep = NULL;
4154 return (freebsd11_getdirentries(td, &ap));
4155 }
4156 #endif /* COMPAT_FREEBSD11 */
4157
4158 /*
4159 * Read a block of directory entries in a filesystem independent format.
4160 */
4161 int
sys_getdirentries(struct thread * td,struct getdirentries_args * uap)4162 sys_getdirentries(struct thread *td, struct getdirentries_args *uap)
4163 {
4164 off_t base;
4165 int error;
4166
4167 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
4168 NULL, UIO_USERSPACE);
4169 if (error != 0)
4170 return (error);
4171 if (uap->basep != NULL)
4172 error = copyout(&base, uap->basep, sizeof(off_t));
4173 return (error);
4174 }
4175
4176 int
kern_getdirentries(struct thread * td,int fd,char * buf,size_t count,off_t * basep,ssize_t * residp,enum uio_seg bufseg)4177 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count,
4178 off_t *basep, ssize_t *residp, enum uio_seg bufseg)
4179 {
4180 struct vnode *vp;
4181 struct file *fp;
4182 struct uio auio;
4183 struct iovec aiov;
4184 off_t loff;
4185 int error, eofflag;
4186 off_t foffset;
4187
4188 AUDIT_ARG_FD(fd);
4189 if (count > IOSIZE_MAX)
4190 return (EINVAL);
4191 auio.uio_resid = count;
4192 error = getvnode(td, fd, &cap_read_rights, &fp);
4193 if (error != 0)
4194 return (error);
4195 if ((fp->f_flag & FREAD) == 0) {
4196 fdrop(fp, td);
4197 return (EBADF);
4198 }
4199 vp = fp->f_vnode;
4200 foffset = foffset_lock(fp, 0);
4201 unionread:
4202 if (vp->v_type != VDIR) {
4203 error = EINVAL;
4204 goto fail;
4205 }
4206 if (__predict_false((vp->v_vflag & VV_UNLINKED) != 0)) {
4207 error = ENOENT;
4208 goto fail;
4209 }
4210 aiov.iov_base = buf;
4211 aiov.iov_len = count;
4212 auio.uio_iov = &aiov;
4213 auio.uio_iovcnt = 1;
4214 auio.uio_rw = UIO_READ;
4215 auio.uio_segflg = bufseg;
4216 auio.uio_td = td;
4217 vn_lock(vp, LK_SHARED | LK_RETRY);
4218 AUDIT_ARG_VNODE1(vp);
4219 loff = auio.uio_offset = foffset;
4220 #ifdef MAC
4221 error = mac_vnode_check_readdir(td->td_ucred, vp);
4222 if (error == 0)
4223 #endif
4224 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4225 NULL);
4226 foffset = auio.uio_offset;
4227 if (error != 0) {
4228 VOP_UNLOCK(vp);
4229 goto fail;
4230 }
4231 if (count == auio.uio_resid &&
4232 (vp->v_vflag & VV_ROOT) &&
4233 (vp->v_mount->mnt_flag & MNT_UNION)) {
4234 struct vnode *tvp = vp;
4235
4236 vp = vp->v_mount->mnt_vnodecovered;
4237 VREF(vp);
4238 fp->f_vnode = vp;
4239 foffset = 0;
4240 vput(tvp);
4241 goto unionread;
4242 }
4243 VOP_UNLOCK(vp);
4244 *basep = loff;
4245 if (residp != NULL)
4246 *residp = auio.uio_resid;
4247 td->td_retval[0] = count - auio.uio_resid;
4248 fail:
4249 foffset_unlock(fp, foffset, 0);
4250 fdrop(fp, td);
4251 return (error);
4252 }
4253
4254 /*
4255 * Set the mode mask for creation of filesystem nodes.
4256 */
4257 #ifndef _SYS_SYSPROTO_H_
4258 struct umask_args {
4259 int newmask;
4260 };
4261 #endif
4262 int
sys_umask(struct thread * td,struct umask_args * uap)4263 sys_umask(struct thread *td, struct umask_args *uap)
4264 {
4265 struct pwddesc *pdp;
4266
4267 pdp = td->td_proc->p_pd;
4268 PWDDESC_XLOCK(pdp);
4269 td->td_retval[0] = pdp->pd_cmask;
4270 pdp->pd_cmask = uap->newmask & ALLPERMS;
4271 PWDDESC_XUNLOCK(pdp);
4272 return (0);
4273 }
4274
4275 /*
4276 * Void all references to file by ripping underlying filesystem away from
4277 * vnode.
4278 */
4279 #ifndef _SYS_SYSPROTO_H_
4280 struct revoke_args {
4281 char *path;
4282 };
4283 #endif
4284 int
sys_revoke(struct thread * td,struct revoke_args * uap)4285 sys_revoke(struct thread *td, struct revoke_args *uap)
4286 {
4287 struct vnode *vp;
4288 struct vattr vattr;
4289 struct nameidata nd;
4290 int error;
4291
4292 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4293 uap->path);
4294 if ((error = namei(&nd)) != 0)
4295 return (error);
4296 vp = nd.ni_vp;
4297 NDFREE_PNBUF(&nd);
4298 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4299 error = EINVAL;
4300 goto out;
4301 }
4302 #ifdef MAC
4303 error = mac_vnode_check_revoke(td->td_ucred, vp);
4304 if (error != 0)
4305 goto out;
4306 #endif
4307 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4308 if (error != 0)
4309 goto out;
4310 if (td->td_ucred->cr_uid != vattr.va_uid) {
4311 error = priv_check(td, PRIV_VFS_ADMIN);
4312 if (error != 0)
4313 goto out;
4314 }
4315 if (devfs_usecount(vp) > 0)
4316 VOP_REVOKE(vp, REVOKEALL);
4317 out:
4318 vput(vp);
4319 return (error);
4320 }
4321
4322 /*
4323 * This variant of getvnode() allows O_PATH files. Caller should
4324 * ensure that returned file and vnode are only used for compatible
4325 * semantics.
4326 */
4327 int
getvnode_path(struct thread * td,int fd,cap_rights_t * rightsp,struct file ** fpp)4328 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp,
4329 struct file **fpp)
4330 {
4331 struct file *fp;
4332 int error;
4333
4334 error = fget_unlocked(td, fd, rightsp, &fp);
4335 if (error != 0)
4336 return (error);
4337
4338 /*
4339 * The file could be not of the vnode type, or it may be not
4340 * yet fully initialized, in which case the f_vnode pointer
4341 * may be set, but f_ops is still badfileops. E.g.,
4342 * devfs_open() transiently create such situation to
4343 * facilitate csw d_fdopen().
4344 *
4345 * Dupfdopen() handling in kern_openat() installs the
4346 * half-baked file into the process descriptor table, allowing
4347 * other thread to dereference it. Guard against the race by
4348 * checking f_ops.
4349 */
4350 if (__predict_false(fp->f_vnode == NULL || fp->f_ops == &badfileops)) {
4351 fdrop(fp, td);
4352 *fpp = NULL;
4353 return (EINVAL);
4354 }
4355
4356 *fpp = fp;
4357 return (0);
4358 }
4359
4360 /*
4361 * Convert a user file descriptor to a kernel file entry and check
4362 * that, if it is a capability, the correct rights are present.
4363 * A reference on the file entry is held upon returning.
4364 */
4365 int
getvnode(struct thread * td,int fd,cap_rights_t * rightsp,struct file ** fpp)4366 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
4367 {
4368 int error;
4369
4370 error = getvnode_path(td, fd, rightsp, fpp);
4371 if (__predict_false(error != 0))
4372 return (error);
4373
4374 /*
4375 * Filter out O_PATH file descriptors, most getvnode() callers
4376 * do not call fo_ methods.
4377 */
4378 if (__predict_false((*fpp)->f_ops == &path_fileops)) {
4379 fdrop(*fpp, td);
4380 *fpp = NULL;
4381 error = EBADF;
4382 }
4383
4384 return (error);
4385 }
4386
4387 /*
4388 * Get an (NFS) file handle.
4389 */
4390 #ifndef _SYS_SYSPROTO_H_
4391 struct lgetfh_args {
4392 char *fname;
4393 fhandle_t *fhp;
4394 };
4395 #endif
4396 int
sys_lgetfh(struct thread * td,struct lgetfh_args * uap)4397 sys_lgetfh(struct thread *td, struct lgetfh_args *uap)
4398 {
4399
4400 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname,
4401 UIO_USERSPACE, uap->fhp, UIO_USERSPACE));
4402 }
4403
4404 #ifndef _SYS_SYSPROTO_H_
4405 struct getfh_args {
4406 char *fname;
4407 fhandle_t *fhp;
4408 };
4409 #endif
4410 int
sys_getfh(struct thread * td,struct getfh_args * uap)4411 sys_getfh(struct thread *td, struct getfh_args *uap)
4412 {
4413
4414 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE,
4415 uap->fhp, UIO_USERSPACE));
4416 }
4417
4418 /*
4419 * syscall for the rpc.lockd to use to translate an open descriptor into
4420 * a NFS file handle.
4421 *
4422 * warning: do not remove the priv_check() call or this becomes one giant
4423 * security hole.
4424 */
4425 #ifndef _SYS_SYSPROTO_H_
4426 struct getfhat_args {
4427 int fd;
4428 char *path;
4429 fhandle_t *fhp;
4430 int flags;
4431 };
4432 #endif
4433 int
sys_getfhat(struct thread * td,struct getfhat_args * uap)4434 sys_getfhat(struct thread *td, struct getfhat_args *uap)
4435 {
4436
4437 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE,
4438 uap->fhp, UIO_USERSPACE));
4439 }
4440
4441 int
kern_getfhat(struct thread * td,int flags,int fd,const char * path,enum uio_seg pathseg,fhandle_t * fhp,enum uio_seg fhseg)4442 kern_getfhat(struct thread *td, int flags, int fd, const char *path,
4443 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg)
4444 {
4445 struct nameidata nd;
4446 fhandle_t fh;
4447 struct vnode *vp;
4448 int error;
4449
4450 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0)
4451 return (EINVAL);
4452 error = priv_check(td, PRIV_VFS_GETFH);
4453 if (error != 0)
4454 return (error);
4455 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW |
4456 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path,
4457 fd);
4458 error = namei(&nd);
4459 if (error != 0)
4460 return (error);
4461 NDFREE_PNBUF(&nd);
4462 vp = nd.ni_vp;
4463 bzero(&fh, sizeof(fh));
4464 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4465 error = VOP_VPTOFH(vp, &fh.fh_fid);
4466 vput(vp);
4467 if (error == 0) {
4468 if (fhseg == UIO_USERSPACE)
4469 error = copyout(&fh, fhp, sizeof (fh));
4470 else
4471 memcpy(fhp, &fh, sizeof(fh));
4472 }
4473 return (error);
4474 }
4475
4476 #ifndef _SYS_SYSPROTO_H_
4477 struct fhlink_args {
4478 fhandle_t *fhp;
4479 const char *to;
4480 };
4481 #endif
4482 int
sys_fhlink(struct thread * td,struct fhlink_args * uap)4483 sys_fhlink(struct thread *td, struct fhlink_args *uap)
4484 {
4485
4486 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp));
4487 }
4488
4489 #ifndef _SYS_SYSPROTO_H_
4490 struct fhlinkat_args {
4491 fhandle_t *fhp;
4492 int tofd;
4493 const char *to;
4494 };
4495 #endif
4496 int
sys_fhlinkat(struct thread * td,struct fhlinkat_args * uap)4497 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap)
4498 {
4499
4500 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp));
4501 }
4502
4503 static int
kern_fhlinkat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,fhandle_t * fhp)4504 kern_fhlinkat(struct thread *td, int fd, const char *path,
4505 enum uio_seg pathseg, fhandle_t *fhp)
4506 {
4507 fhandle_t fh;
4508 struct mount *mp;
4509 struct vnode *vp;
4510 int error;
4511
4512 error = priv_check(td, PRIV_VFS_GETFH);
4513 if (error != 0)
4514 return (error);
4515 error = copyin(fhp, &fh, sizeof(fh));
4516 if (error != 0)
4517 return (error);
4518 do {
4519 bwillwrite();
4520 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4521 return (ESTALE);
4522 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4523 vfs_unbusy(mp);
4524 if (error != 0)
4525 return (error);
4526 VOP_UNLOCK(vp);
4527 error = kern_linkat_vp(td, vp, fd, path, pathseg);
4528 } while (error == EAGAIN || error == ERELOOKUP);
4529 return (error);
4530 }
4531
4532 #ifndef _SYS_SYSPROTO_H_
4533 struct fhreadlink_args {
4534 fhandle_t *fhp;
4535 char *buf;
4536 size_t bufsize;
4537 };
4538 #endif
4539 int
sys_fhreadlink(struct thread * td,struct fhreadlink_args * uap)4540 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap)
4541 {
4542 fhandle_t fh;
4543 struct mount *mp;
4544 struct vnode *vp;
4545 int error;
4546
4547 error = priv_check(td, PRIV_VFS_GETFH);
4548 if (error != 0)
4549 return (error);
4550 if (uap->bufsize > IOSIZE_MAX)
4551 return (EINVAL);
4552 error = copyin(uap->fhp, &fh, sizeof(fh));
4553 if (error != 0)
4554 return (error);
4555 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4556 return (ESTALE);
4557 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4558 vfs_unbusy(mp);
4559 if (error != 0)
4560 return (error);
4561 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td);
4562 vput(vp);
4563 return (error);
4564 }
4565
4566 /*
4567 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4568 * open descriptor.
4569 *
4570 * warning: do not remove the priv_check() call or this becomes one giant
4571 * security hole.
4572 */
4573 #ifndef _SYS_SYSPROTO_H_
4574 struct fhopen_args {
4575 const struct fhandle *u_fhp;
4576 int flags;
4577 };
4578 #endif
4579 int
sys_fhopen(struct thread * td,struct fhopen_args * uap)4580 sys_fhopen(struct thread *td, struct fhopen_args *uap)
4581 {
4582 return (kern_fhopen(td, uap->u_fhp, uap->flags));
4583 }
4584
4585 int
kern_fhopen(struct thread * td,const struct fhandle * u_fhp,int flags)4586 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags)
4587 {
4588 struct mount *mp;
4589 struct vnode *vp;
4590 struct fhandle fhp;
4591 struct file *fp;
4592 int fmode, error;
4593 int indx;
4594
4595 error = priv_check(td, PRIV_VFS_FHOPEN);
4596 if (error != 0)
4597 return (error);
4598 indx = -1;
4599 fmode = FFLAGS(flags);
4600 /* why not allow a non-read/write open for our lockd? */
4601 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4602 return (EINVAL);
4603 error = copyin(u_fhp, &fhp, sizeof(fhp));
4604 if (error != 0)
4605 return(error);
4606 /* find the mount point */
4607 mp = vfs_busyfs(&fhp.fh_fsid);
4608 if (mp == NULL)
4609 return (ESTALE);
4610 /* now give me my vnode, it gets returned to me locked */
4611 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4612 vfs_unbusy(mp);
4613 if (error != 0)
4614 return (error);
4615
4616 error = falloc_noinstall(td, &fp);
4617 if (error != 0) {
4618 vput(vp);
4619 return (error);
4620 }
4621 /*
4622 * An extra reference on `fp' has been held for us by
4623 * falloc_noinstall().
4624 */
4625
4626 #ifdef INVARIANTS
4627 td->td_dupfd = -1;
4628 #endif
4629 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4630 if (error != 0) {
4631 KASSERT(fp->f_ops == &badfileops,
4632 ("VOP_OPEN in fhopen() set f_ops"));
4633 KASSERT(td->td_dupfd < 0,
4634 ("fhopen() encountered fdopen()"));
4635
4636 vput(vp);
4637 goto bad;
4638 }
4639 #ifdef INVARIANTS
4640 td->td_dupfd = 0;
4641 #endif
4642 fp->f_vnode = vp;
4643 finit_vnode(fp, fmode, NULL, &vnops);
4644 VOP_UNLOCK(vp);
4645 if ((fmode & O_TRUNC) != 0) {
4646 error = fo_truncate(fp, 0, td->td_ucred, td);
4647 if (error != 0)
4648 goto bad;
4649 }
4650
4651 error = finstall(td, fp, &indx, fmode, NULL);
4652 bad:
4653 fdrop(fp, td);
4654 td->td_retval[0] = indx;
4655 return (error);
4656 }
4657
4658 /*
4659 * Stat an (NFS) file handle.
4660 */
4661 #ifndef _SYS_SYSPROTO_H_
4662 struct fhstat_args {
4663 struct fhandle *u_fhp;
4664 struct stat *sb;
4665 };
4666 #endif
4667 int
sys_fhstat(struct thread * td,struct fhstat_args * uap)4668 sys_fhstat(struct thread *td, struct fhstat_args *uap)
4669 {
4670 struct stat sb;
4671 struct fhandle fh;
4672 int error;
4673
4674 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4675 if (error != 0)
4676 return (error);
4677 error = kern_fhstat(td, fh, &sb);
4678 if (error == 0)
4679 error = copyout(&sb, uap->sb, sizeof(sb));
4680 return (error);
4681 }
4682
4683 int
kern_fhstat(struct thread * td,struct fhandle fh,struct stat * sb)4684 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4685 {
4686 struct mount *mp;
4687 struct vnode *vp;
4688 int error;
4689
4690 error = priv_check(td, PRIV_VFS_FHSTAT);
4691 if (error != 0)
4692 return (error);
4693 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4694 return (ESTALE);
4695 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4696 vfs_unbusy(mp);
4697 if (error != 0)
4698 return (error);
4699 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED);
4700 vput(vp);
4701 return (error);
4702 }
4703
4704 /*
4705 * Implement fstatfs() for (NFS) file handles.
4706 */
4707 #ifndef _SYS_SYSPROTO_H_
4708 struct fhstatfs_args {
4709 struct fhandle *u_fhp;
4710 struct statfs *buf;
4711 };
4712 #endif
4713 int
sys_fhstatfs(struct thread * td,struct fhstatfs_args * uap)4714 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap)
4715 {
4716 struct statfs *sfp;
4717 fhandle_t fh;
4718 int error;
4719
4720 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4721 if (error != 0)
4722 return (error);
4723 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
4724 error = kern_fhstatfs(td, fh, sfp);
4725 if (error == 0)
4726 error = copyout(sfp, uap->buf, sizeof(*sfp));
4727 free(sfp, M_STATFS);
4728 return (error);
4729 }
4730
4731 int
kern_fhstatfs(struct thread * td,fhandle_t fh,struct statfs * buf)4732 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4733 {
4734 struct mount *mp;
4735 struct vnode *vp;
4736 int error;
4737
4738 error = priv_check(td, PRIV_VFS_FHSTATFS);
4739 if (error != 0)
4740 return (error);
4741 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4742 return (ESTALE);
4743 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4744 if (error != 0) {
4745 vfs_unbusy(mp);
4746 return (error);
4747 }
4748 vput(vp);
4749 error = prison_canseemount(td->td_ucred, mp);
4750 if (error != 0)
4751 goto out;
4752 #ifdef MAC
4753 error = mac_mount_check_stat(td->td_ucred, mp);
4754 if (error != 0)
4755 goto out;
4756 #endif
4757 error = VFS_STATFS(mp, buf);
4758 out:
4759 vfs_unbusy(mp);
4760 return (error);
4761 }
4762
4763 /*
4764 * Unlike madvise(2), we do not make a best effort to remember every
4765 * possible caching hint. Instead, we remember the last setting with
4766 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4767 * region of any current setting.
4768 */
4769 int
kern_posix_fadvise(struct thread * td,int fd,off_t offset,off_t len,int advice)4770 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4771 int advice)
4772 {
4773 struct fadvise_info *fa, *new;
4774 struct file *fp;
4775 struct vnode *vp;
4776 off_t end;
4777 int error;
4778
4779 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4780 return (EINVAL);
4781 AUDIT_ARG_VALUE(advice);
4782 switch (advice) {
4783 case POSIX_FADV_SEQUENTIAL:
4784 case POSIX_FADV_RANDOM:
4785 case POSIX_FADV_NOREUSE:
4786 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4787 break;
4788 case POSIX_FADV_NORMAL:
4789 case POSIX_FADV_WILLNEED:
4790 case POSIX_FADV_DONTNEED:
4791 new = NULL;
4792 break;
4793 default:
4794 return (EINVAL);
4795 }
4796 /* XXX: CAP_POSIX_FADVISE? */
4797 AUDIT_ARG_FD(fd);
4798 error = fget(td, fd, &cap_no_rights, &fp);
4799 if (error != 0)
4800 goto out;
4801 AUDIT_ARG_FILE(td->td_proc, fp);
4802 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4803 error = ESPIPE;
4804 goto out;
4805 }
4806 if (fp->f_type != DTYPE_VNODE) {
4807 error = ENODEV;
4808 goto out;
4809 }
4810 vp = fp->f_vnode;
4811 if (vp->v_type != VREG) {
4812 error = ENODEV;
4813 goto out;
4814 }
4815 if (len == 0)
4816 end = OFF_MAX;
4817 else
4818 end = offset + len - 1;
4819 switch (advice) {
4820 case POSIX_FADV_SEQUENTIAL:
4821 case POSIX_FADV_RANDOM:
4822 case POSIX_FADV_NOREUSE:
4823 /*
4824 * Try to merge any existing non-standard region with
4825 * this new region if possible, otherwise create a new
4826 * non-standard region for this request.
4827 */
4828 mtx_pool_lock(mtxpool_sleep, fp);
4829 fa = fp->f_advice;
4830 if (fa != NULL && fa->fa_advice == advice &&
4831 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4832 (end != OFF_MAX && fa->fa_start == end + 1) ||
4833 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4834 if (offset < fa->fa_start)
4835 fa->fa_start = offset;
4836 if (end > fa->fa_end)
4837 fa->fa_end = end;
4838 } else {
4839 new->fa_advice = advice;
4840 new->fa_start = offset;
4841 new->fa_end = end;
4842 fp->f_advice = new;
4843 new = fa;
4844 }
4845 mtx_pool_unlock(mtxpool_sleep, fp);
4846 break;
4847 case POSIX_FADV_NORMAL:
4848 /*
4849 * If a the "normal" region overlaps with an existing
4850 * non-standard region, trim or remove the
4851 * non-standard region.
4852 */
4853 mtx_pool_lock(mtxpool_sleep, fp);
4854 fa = fp->f_advice;
4855 if (fa != NULL) {
4856 if (offset <= fa->fa_start && end >= fa->fa_end) {
4857 new = fa;
4858 fp->f_advice = NULL;
4859 } else if (offset <= fa->fa_start &&
4860 end >= fa->fa_start)
4861 fa->fa_start = end + 1;
4862 else if (offset <= fa->fa_end && end >= fa->fa_end)
4863 fa->fa_end = offset - 1;
4864 else if (offset >= fa->fa_start && end <= fa->fa_end) {
4865 /*
4866 * If the "normal" region is a middle
4867 * portion of the existing
4868 * non-standard region, just remove
4869 * the whole thing rather than picking
4870 * one side or the other to
4871 * preserve.
4872 */
4873 new = fa;
4874 fp->f_advice = NULL;
4875 }
4876 }
4877 mtx_pool_unlock(mtxpool_sleep, fp);
4878 break;
4879 case POSIX_FADV_WILLNEED:
4880 case POSIX_FADV_DONTNEED:
4881 error = VOP_ADVISE(vp, offset, end, advice);
4882 break;
4883 }
4884 out:
4885 if (fp != NULL)
4886 fdrop(fp, td);
4887 free(new, M_FADVISE);
4888 return (error);
4889 }
4890
4891 int
sys_posix_fadvise(struct thread * td,struct posix_fadvise_args * uap)4892 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4893 {
4894 int error;
4895
4896 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
4897 uap->advice);
4898 return (kern_posix_error(td, error));
4899 }
4900
4901 int
kern_copy_file_range(struct thread * td,int infd,off_t * inoffp,int outfd,off_t * outoffp,size_t len,unsigned int flags)4902 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd,
4903 off_t *outoffp, size_t len, unsigned int flags)
4904 {
4905 struct file *infp, *outfp;
4906 struct vnode *invp, *outvp;
4907 int error;
4908 size_t retlen;
4909 void *rl_rcookie, *rl_wcookie;
4910 off_t savinoff, savoutoff;
4911
4912 infp = outfp = NULL;
4913 rl_rcookie = rl_wcookie = NULL;
4914 savinoff = -1;
4915 error = 0;
4916 retlen = 0;
4917
4918 if (flags != 0) {
4919 error = EINVAL;
4920 goto out;
4921 }
4922 if (len > SSIZE_MAX)
4923 /*
4924 * Although the len argument is size_t, the return argument
4925 * is ssize_t (which is signed). Therefore a size that won't
4926 * fit in ssize_t can't be returned.
4927 */
4928 len = SSIZE_MAX;
4929
4930 /* Get the file structures for the file descriptors. */
4931 error = fget_read(td, infd,
4932 inoffp != NULL ? &cap_pread_rights : &cap_read_rights, &infp);
4933 if (error != 0)
4934 goto out;
4935 if (infp->f_ops == &badfileops) {
4936 error = EBADF;
4937 goto out;
4938 }
4939 if (infp->f_vnode == NULL) {
4940 error = EINVAL;
4941 goto out;
4942 }
4943 error = fget_write(td, outfd,
4944 outoffp != NULL ? &cap_pwrite_rights : &cap_write_rights, &outfp);
4945 if (error != 0)
4946 goto out;
4947 if (outfp->f_ops == &badfileops) {
4948 error = EBADF;
4949 goto out;
4950 }
4951 if (outfp->f_vnode == NULL) {
4952 error = EINVAL;
4953 goto out;
4954 }
4955
4956 /* Set the offset pointers to the correct place. */
4957 if (inoffp == NULL)
4958 inoffp = &infp->f_offset;
4959 if (outoffp == NULL)
4960 outoffp = &outfp->f_offset;
4961 savinoff = *inoffp;
4962 savoutoff = *outoffp;
4963
4964 invp = infp->f_vnode;
4965 outvp = outfp->f_vnode;
4966 /* Sanity check the f_flag bits. */
4967 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE ||
4968 (infp->f_flag & FREAD) == 0) {
4969 error = EBADF;
4970 goto out;
4971 }
4972
4973 /* If len == 0, just return 0. */
4974 if (len == 0)
4975 goto out;
4976
4977 /*
4978 * If infp and outfp refer to the same file, the byte ranges cannot
4979 * overlap.
4980 */
4981 if (invp == outvp) {
4982 if ((savinoff <= savoutoff && savinoff + len > savoutoff) ||
4983 (savinoff > savoutoff && savoutoff + len > savinoff)) {
4984 error = EINVAL;
4985 goto out;
4986 }
4987 rangelock_may_recurse(&invp->v_rl);
4988 }
4989
4990 /* Range lock the byte ranges for both invp and outvp. */
4991 for (;;) {
4992 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp +
4993 len);
4994 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp +
4995 len);
4996 if (rl_rcookie != NULL)
4997 break;
4998 vn_rangelock_unlock(outvp, rl_wcookie);
4999 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len);
5000 vn_rangelock_unlock(invp, rl_rcookie);
5001 }
5002
5003 retlen = len;
5004 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen,
5005 flags, infp->f_cred, outfp->f_cred, td);
5006 out:
5007 if (rl_rcookie != NULL)
5008 vn_rangelock_unlock(invp, rl_rcookie);
5009 if (rl_wcookie != NULL)
5010 vn_rangelock_unlock(outvp, rl_wcookie);
5011 if (savinoff != -1 && (error == EINTR || error == ERESTART)) {
5012 *inoffp = savinoff;
5013 *outoffp = savoutoff;
5014 }
5015 if (outfp != NULL)
5016 fdrop(outfp, td);
5017 if (infp != NULL)
5018 fdrop(infp, td);
5019 td->td_retval[0] = retlen;
5020 return (error);
5021 }
5022
5023 int
sys_copy_file_range(struct thread * td,struct copy_file_range_args * uap)5024 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap)
5025 {
5026 off_t inoff, outoff, *inoffp, *outoffp;
5027 int error;
5028
5029 inoffp = outoffp = NULL;
5030 if (uap->inoffp != NULL) {
5031 error = copyin(uap->inoffp, &inoff, sizeof(off_t));
5032 if (error != 0)
5033 return (error);
5034 inoffp = &inoff;
5035 }
5036 if (uap->outoffp != NULL) {
5037 error = copyin(uap->outoffp, &outoff, sizeof(off_t));
5038 if (error != 0)
5039 return (error);
5040 outoffp = &outoff;
5041 }
5042 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd,
5043 outoffp, uap->len, uap->flags);
5044 if (error == 0 && uap->inoffp != NULL)
5045 error = copyout(inoffp, uap->inoffp, sizeof(off_t));
5046 if (error == 0 && uap->outoffp != NULL)
5047 error = copyout(outoffp, uap->outoffp, sizeof(off_t));
5048 return (error);
5049 }
5050