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 "opt_capsicum.h"
38 #include "opt_ktrace.h"
39
40 #define EXTERR_CATEGORY EXTERR_CAT_VFSSYSCALL
41 #include <sys/systm.h>
42 #ifdef COMPAT_FREEBSD11
43 #include <sys/abi_compat.h>
44 #endif
45 #include <sys/bio.h>
46 #include <sys/buf.h>
47 #include <sys/capsicum.h>
48 #include <sys/disk.h>
49 #include <sys/dirent.h>
50 #include <sys/exterrvar.h>
51 #include <sys/fcntl.h>
52 #include <sys/file.h>
53 #include <sys/filedesc.h>
54 #include <sys/filio.h>
55 #include <sys/jail.h>
56 #include <sys/kernel.h>
57 #ifdef KTRACE
58 #include <sys/ktrace.h>
59 #endif
60 #include <sys/limits.h>
61 #include <sys/linker.h>
62 #include <sys/malloc.h>
63 #include <sys/mount.h>
64 #include <sys/mutex.h>
65 #include <sys/namei.h>
66 #include <sys/priv.h>
67 #include <sys/proc.h>
68 #include <sys/rwlock.h>
69 #include <sys/sdt.h>
70 #include <sys/stat.h>
71 #include <sys/stdarg.h>
72 #include <sys/sx.h>
73 #include <sys/syscallsubr.h>
74 #include <sys/sysctl.h>
75 #include <sys/sysproto.h>
76 #include <sys/unistd.h>
77 #include <sys/vnode.h>
78
79 #include <security/audit/audit.h>
80 #include <security/mac/mac_framework.h>
81
82 #include <vm/vm.h>
83 #include <vm/vm_object.h>
84 #include <vm/vm_page.h>
85 #include <vm/vnode_pager.h>
86 #include <vm/uma.h>
87
88 #include <fs/devfs/devfs.h>
89
90 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
91
92 static int kern_chflagsat(struct thread *td, int fd, const char *path,
93 enum uio_seg pathseg, u_long flags, int atflag);
94 static int setfflags(struct thread *td, struct vnode *, u_long);
95 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
96 static int getutimens(const struct timespec *, enum uio_seg,
97 struct timespec *, int *);
98 static int setutimes(struct thread *td, struct vnode *,
99 const struct timespec *, int, int);
100 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
101 struct thread *td);
102 static int kern_fhlinkat(struct thread *td, int fd, const char *path,
103 enum uio_seg pathseg, fhandle_t *fhp);
104 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg,
105 size_t count, struct thread *td);
106 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd,
107 const char *path, enum uio_seg segflag);
108
109 uint64_t
at2cnpflags(u_int at_flags,u_int mask)110 at2cnpflags(u_int at_flags, u_int mask)
111 {
112 uint64_t res;
113
114 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) !=
115 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW));
116
117 res = 0;
118 at_flags &= mask;
119 if ((at_flags & AT_RESOLVE_BENEATH) != 0)
120 res |= RBENEATH;
121 if ((at_flags & AT_SYMLINK_FOLLOW) != 0)
122 res |= FOLLOW;
123 /* NOFOLLOW is pseudo flag */
124 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) {
125 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW :
126 FOLLOW;
127 }
128 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0)
129 res |= EMPTYPATH;
130 return (res);
131 }
132
133 int
kern_sync(struct thread * td)134 kern_sync(struct thread *td)
135 {
136 struct mount *mp, *nmp;
137 int save;
138
139 mtx_lock(&mountlist_mtx);
140 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
141 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
142 nmp = TAILQ_NEXT(mp, mnt_list);
143 continue;
144 }
145 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
146 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
147 save = curthread_pflags_set(TDP_SYNCIO);
148 vfs_periodic(mp, MNT_NOWAIT);
149 VFS_SYNC(mp, MNT_NOWAIT);
150 curthread_pflags_restore(save);
151 vn_finished_write(mp);
152 }
153 mtx_lock(&mountlist_mtx);
154 nmp = TAILQ_NEXT(mp, mnt_list);
155 vfs_unbusy(mp);
156 }
157 mtx_unlock(&mountlist_mtx);
158 return (0);
159 }
160
161 /*
162 * Sync each mounted filesystem.
163 */
164 #ifndef _SYS_SYSPROTO_H_
165 struct sync_args {
166 int dummy;
167 };
168 #endif
169 /* ARGSUSED */
170 int
sys_sync(struct thread * td,struct sync_args * uap)171 sys_sync(struct thread *td, struct sync_args *uap)
172 {
173
174 return (kern_sync(td));
175 }
176
177 /*
178 * Change filesystem quotas.
179 */
180 #ifndef _SYS_SYSPROTO_H_
181 struct quotactl_args {
182 char *path;
183 int cmd;
184 int uid;
185 caddr_t arg;
186 };
187 #endif
188 int
sys_quotactl(struct thread * td,struct quotactl_args * uap)189 sys_quotactl(struct thread *td, struct quotactl_args *uap)
190 {
191 struct mount *mp;
192 struct nameidata nd;
193 int error;
194 bool mp_busy;
195
196 AUDIT_ARG_CMD(uap->cmd);
197 AUDIT_ARG_UID(uap->uid);
198 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
199 return (EPERM);
200 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
201 uap->path);
202 if ((error = namei(&nd)) != 0)
203 return (error);
204 NDFREE_PNBUF(&nd);
205 mp = nd.ni_vp->v_mount;
206 vfs_ref(mp);
207 vput(nd.ni_vp);
208 error = vfs_busy(mp, 0);
209 if (error != 0) {
210 vfs_rel(mp);
211 return (error);
212 }
213 mp_busy = true;
214 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, &mp_busy);
215
216 /*
217 * Since quota on/off operations typically need to open quota
218 * files, the implementation may need to unbusy the mount point
219 * before calling into namei. Otherwise, unmount might be
220 * started between two vfs_busy() invocations (first is ours,
221 * second is from mount point cross-walk code in lookup()),
222 * causing deadlock.
223 *
224 * Avoid unbusying mp if the implementation indicates it has
225 * already done so.
226 */
227 if (mp_busy)
228 vfs_unbusy(mp);
229 vfs_rel(mp);
230 return (error);
231 }
232
233 /*
234 * Used by statfs conversion routines to scale the block size up if
235 * necessary so that all of the block counts are <= 'max_size'. Note
236 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
237 * value of 'n'.
238 */
239 void
statfs_scale_blocks(struct statfs * sf,long max_size)240 statfs_scale_blocks(struct statfs *sf, long max_size)
241 {
242 uint64_t count;
243 int shift;
244
245 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
246
247 /*
248 * Attempt to scale the block counts to give a more accurate
249 * overview to userland of the ratio of free space to used
250 * space. To do this, find the largest block count and compute
251 * a divisor that lets it fit into a signed integer <= max_size.
252 */
253 if (sf->f_bavail < 0)
254 count = -sf->f_bavail;
255 else
256 count = sf->f_bavail;
257 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
258 if (count <= max_size)
259 return;
260
261 count >>= flsl(max_size);
262 shift = 0;
263 while (count > 0) {
264 shift++;
265 count >>=1;
266 }
267
268 sf->f_bsize <<= shift;
269 sf->f_blocks >>= shift;
270 sf->f_bfree >>= shift;
271 sf->f_bavail >>= shift;
272 }
273
274 static int
kern_do_statfs(struct thread * td,struct mount * mp,struct statfs * buf)275 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
276 {
277 int error;
278
279 if (mp == NULL)
280 return (EBADF);
281 error = vfs_busy(mp, 0);
282 vfs_rel(mp);
283 if (error != 0)
284 return (error);
285 #ifdef MAC
286 error = mac_mount_check_stat(td->td_ucred, mp);
287 if (error != 0)
288 goto out;
289 #endif
290 error = VFS_STATFS(mp, buf);
291 if (error != 0)
292 goto out;
293 if (priv_check_cred_vfs_generation(td->td_ucred))
294 prison_enforce_statfs(td->td_ucred, mp, buf);
295 out:
296 vfs_unbusy(mp);
297 return (error);
298 }
299
300 /*
301 * Get filesystem statistics.
302 */
303 #ifndef _SYS_SYSPROTO_H_
304 struct statfs_args {
305 char *path;
306 struct statfs *buf;
307 };
308 #endif
309 int
sys_statfs(struct thread * td,struct statfs_args * uap)310 sys_statfs(struct thread *td, struct statfs_args *uap)
311 {
312 struct statfs *sfp;
313 int error;
314
315 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
316 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
317 if (error == 0)
318 error = copyout(sfp, uap->buf, sizeof(struct statfs));
319 free(sfp, M_STATFS);
320 return (error);
321 }
322
323 int
kern_statfs(struct thread * td,const char * path,enum uio_seg pathseg,struct statfs * buf)324 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg,
325 struct statfs *buf)
326 {
327 struct mount *mp;
328 struct nameidata nd;
329 int error;
330
331 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path);
332 error = namei(&nd);
333 if (error != 0)
334 return (error);
335 NDFREE_PNBUF(&nd);
336 mp = vfs_ref_from_vp(nd.ni_vp);
337 vrele(nd.ni_vp);
338 return (kern_do_statfs(td, mp, buf));
339 }
340
341 /*
342 * Get filesystem statistics.
343 */
344 #ifndef _SYS_SYSPROTO_H_
345 struct fstatfs_args {
346 int fd;
347 struct statfs *buf;
348 };
349 #endif
350 int
sys_fstatfs(struct thread * td,struct fstatfs_args * uap)351 sys_fstatfs(struct thread *td, struct fstatfs_args *uap)
352 {
353 struct statfs *sfp;
354 int error;
355
356 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
357 error = kern_fstatfs(td, uap->fd, sfp);
358 if (error == 0)
359 error = copyout(sfp, uap->buf, sizeof(struct statfs));
360 free(sfp, M_STATFS);
361 return (error);
362 }
363
364 int
kern_fstatfs(struct thread * td,int fd,struct statfs * buf)365 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
366 {
367 struct file *fp;
368 struct mount *mp;
369 struct vnode *vp;
370 int error;
371
372 AUDIT_ARG_FD(fd);
373 error = getvnode_path(td, fd, &cap_fstatfs_rights, NULL, &fp);
374 if (error != 0)
375 return (error);
376 vp = fp->f_vnode;
377 #ifdef AUDIT
378 if (AUDITING_TD(td)) {
379 vn_lock(vp, LK_SHARED | LK_RETRY);
380 AUDIT_ARG_VNODE1(vp);
381 VOP_UNLOCK(vp);
382 }
383 #endif
384 mp = vfs_ref_from_vp(vp);
385 fdrop(fp, td);
386 return (kern_do_statfs(td, mp, buf));
387 }
388
389 /*
390 * Get statistics on all filesystems.
391 */
392 #ifndef _SYS_SYSPROTO_H_
393 struct getfsstat_args {
394 struct statfs *buf;
395 long bufsize;
396 int mode;
397 };
398 #endif
399 int
sys_getfsstat(struct thread * td,struct getfsstat_args * uap)400 sys_getfsstat(struct thread *td, struct getfsstat_args *uap)
401 {
402 size_t count;
403 int error;
404
405 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX)
406 return (EINVAL);
407 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count,
408 UIO_USERSPACE, uap->mode);
409 if (error == 0)
410 td->td_retval[0] = count;
411 return (error);
412 }
413
414 /*
415 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
416 * The caller is responsible for freeing memory which will be allocated
417 * in '*buf'.
418 */
419 int
kern_getfsstat(struct thread * td,struct statfs ** buf,size_t bufsize,size_t * countp,enum uio_seg bufseg,int mode)420 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
421 size_t *countp, enum uio_seg bufseg, int mode)
422 {
423 struct mount *mp, *nmp;
424 struct statfs *sfsp, *sp, *sptmp, *tofree;
425 size_t count, maxcount;
426 int error;
427
428 switch (mode) {
429 case MNT_WAIT:
430 case MNT_NOWAIT:
431 break;
432 default:
433 if (bufseg == UIO_SYSSPACE)
434 *buf = NULL;
435 return (EINVAL);
436 }
437 restart:
438 maxcount = bufsize / sizeof(struct statfs);
439 if (bufsize == 0) {
440 sfsp = NULL;
441 tofree = NULL;
442 } else if (bufseg == UIO_USERSPACE) {
443 sfsp = *buf;
444 tofree = NULL;
445 } else /* if (bufseg == UIO_SYSSPACE) */ {
446 count = 0;
447 mtx_lock(&mountlist_mtx);
448 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
449 count++;
450 }
451 mtx_unlock(&mountlist_mtx);
452 if (maxcount > count)
453 maxcount = count;
454 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs),
455 M_STATFS, M_WAITOK);
456 }
457
458 count = 0;
459
460 /*
461 * If there is no target buffer they only want the count.
462 *
463 * This could be TAILQ_FOREACH but it is open-coded to match the original
464 * code below.
465 */
466 if (sfsp == NULL) {
467 mtx_lock(&mountlist_mtx);
468 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
469 if (prison_canseemount(td->td_ucred, mp) != 0) {
470 nmp = TAILQ_NEXT(mp, mnt_list);
471 continue;
472 }
473 #ifdef MAC
474 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
475 nmp = TAILQ_NEXT(mp, mnt_list);
476 continue;
477 }
478 #endif
479 count++;
480 nmp = TAILQ_NEXT(mp, mnt_list);
481 }
482 mtx_unlock(&mountlist_mtx);
483 *countp = count;
484 return (0);
485 }
486
487 /*
488 * They want the entire thing.
489 *
490 * Short-circuit the corner case of no room for anything, avoids
491 * relocking below.
492 */
493 if (maxcount < 1) {
494 goto out;
495 }
496
497 mtx_lock(&mountlist_mtx);
498 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
499 if (prison_canseemount(td->td_ucred, mp) != 0) {
500 nmp = TAILQ_NEXT(mp, mnt_list);
501 continue;
502 }
503 #ifdef MAC
504 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
505 nmp = TAILQ_NEXT(mp, mnt_list);
506 continue;
507 }
508 #endif
509 if (mode == MNT_WAIT) {
510 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) {
511 /*
512 * If vfs_busy() failed, and MBF_NOWAIT
513 * wasn't passed, then the mp is gone.
514 * Furthermore, because of MBF_MNTLSTLOCK,
515 * the mountlist_mtx was dropped. We have
516 * no other choice than to start over.
517 */
518 mtx_unlock(&mountlist_mtx);
519 free(tofree, M_STATFS);
520 goto restart;
521 }
522 } else {
523 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
524 nmp = TAILQ_NEXT(mp, mnt_list);
525 continue;
526 }
527 }
528 sp = &mp->mnt_stat;
529 /*
530 * If MNT_NOWAIT is specified, do not refresh
531 * the fsstat cache.
532 */
533 if (mode != MNT_NOWAIT) {
534 error = VFS_STATFS(mp, sp);
535 if (error != 0) {
536 mtx_lock(&mountlist_mtx);
537 nmp = TAILQ_NEXT(mp, mnt_list);
538 vfs_unbusy(mp);
539 continue;
540 }
541 }
542 if (priv_check_cred_vfs_generation(td->td_ucred)) {
543 sptmp = malloc(sizeof(struct statfs), M_STATFS,
544 M_WAITOK);
545 *sptmp = *sp;
546 prison_enforce_statfs(td->td_ucred, mp, sptmp);
547 sp = sptmp;
548 } else
549 sptmp = NULL;
550 if (bufseg == UIO_SYSSPACE) {
551 bcopy(sp, sfsp, sizeof(*sp));
552 free(sptmp, M_STATFS);
553 } else /* if (bufseg == UIO_USERSPACE) */ {
554 error = copyout(sp, sfsp, sizeof(*sp));
555 free(sptmp, M_STATFS);
556 if (error != 0) {
557 vfs_unbusy(mp);
558 return (error);
559 }
560 }
561 sfsp++;
562 count++;
563
564 if (count == maxcount) {
565 vfs_unbusy(mp);
566 goto out;
567 }
568
569 mtx_lock(&mountlist_mtx);
570 nmp = TAILQ_NEXT(mp, mnt_list);
571 vfs_unbusy(mp);
572 }
573 mtx_unlock(&mountlist_mtx);
574 out:
575 *countp = count;
576 return (0);
577 }
578
579 #ifdef COMPAT_FREEBSD4
580 /*
581 * Get old format filesystem statistics.
582 */
583 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *);
584
585 #ifndef _SYS_SYSPROTO_H_
586 struct freebsd4_statfs_args {
587 char *path;
588 struct ostatfs *buf;
589 };
590 #endif
591 int
freebsd4_statfs(struct thread * td,struct freebsd4_statfs_args * uap)592 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap)
593 {
594 struct ostatfs osb;
595 struct statfs *sfp;
596 int error;
597
598 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
599 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
600 if (error == 0) {
601 freebsd4_cvtstatfs(sfp, &osb);
602 error = copyout(&osb, uap->buf, sizeof(osb));
603 }
604 free(sfp, M_STATFS);
605 return (error);
606 }
607
608 /*
609 * Get filesystem statistics.
610 */
611 #ifndef _SYS_SYSPROTO_H_
612 struct freebsd4_fstatfs_args {
613 int fd;
614 struct ostatfs *buf;
615 };
616 #endif
617 int
freebsd4_fstatfs(struct thread * td,struct freebsd4_fstatfs_args * uap)618 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap)
619 {
620 struct ostatfs osb;
621 struct statfs *sfp;
622 int error;
623
624 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
625 error = kern_fstatfs(td, uap->fd, sfp);
626 if (error == 0) {
627 freebsd4_cvtstatfs(sfp, &osb);
628 error = copyout(&osb, uap->buf, sizeof(osb));
629 }
630 free(sfp, M_STATFS);
631 return (error);
632 }
633
634 /*
635 * Get statistics on all filesystems.
636 */
637 #ifndef _SYS_SYSPROTO_H_
638 struct freebsd4_getfsstat_args {
639 struct ostatfs *buf;
640 long bufsize;
641 int mode;
642 };
643 #endif
644 int
freebsd4_getfsstat(struct thread * td,struct freebsd4_getfsstat_args * uap)645 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap)
646 {
647 struct statfs *buf, *sp;
648 struct ostatfs osb;
649 size_t count, size;
650 int error;
651
652 if (uap->bufsize < 0)
653 return (EINVAL);
654 count = uap->bufsize / sizeof(struct ostatfs);
655 if (count > SIZE_MAX / sizeof(struct statfs))
656 return (EINVAL);
657 size = count * sizeof(struct statfs);
658 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
659 uap->mode);
660 if (error == 0)
661 td->td_retval[0] = count;
662 if (size != 0) {
663 sp = buf;
664 while (count != 0 && error == 0) {
665 freebsd4_cvtstatfs(sp, &osb);
666 error = copyout(&osb, uap->buf, sizeof(osb));
667 sp++;
668 uap->buf++;
669 count--;
670 }
671 free(buf, M_STATFS);
672 }
673 return (error);
674 }
675
676 /*
677 * Implement fstatfs() for (NFS) file handles.
678 */
679 #ifndef _SYS_SYSPROTO_H_
680 struct freebsd4_fhstatfs_args {
681 struct fhandle *u_fhp;
682 struct ostatfs *buf;
683 };
684 #endif
685 int
freebsd4_fhstatfs(struct thread * td,struct freebsd4_fhstatfs_args * uap)686 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap)
687 {
688 struct ostatfs osb;
689 struct statfs *sfp;
690 fhandle_t fh;
691 int error;
692
693 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
694 if (error != 0)
695 return (error);
696 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
697 error = kern_fhstatfs(td, fh, sfp);
698 if (error == 0) {
699 freebsd4_cvtstatfs(sfp, &osb);
700 error = copyout(&osb, uap->buf, sizeof(osb));
701 }
702 free(sfp, M_STATFS);
703 return (error);
704 }
705
706 /*
707 * Convert a new format statfs structure to an old format statfs structure.
708 */
709 static void
freebsd4_cvtstatfs(struct statfs * nsp,struct ostatfs * osp)710 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp)
711 {
712
713 statfs_scale_blocks(nsp, LONG_MAX);
714 bzero(osp, sizeof(*osp));
715 osp->f_bsize = nsp->f_bsize;
716 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
717 osp->f_blocks = nsp->f_blocks;
718 osp->f_bfree = nsp->f_bfree;
719 osp->f_bavail = nsp->f_bavail;
720 osp->f_files = MIN(nsp->f_files, LONG_MAX);
721 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
722 osp->f_owner = nsp->f_owner;
723 osp->f_type = nsp->f_type;
724 osp->f_flags = nsp->f_flags;
725 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
726 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
727 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
728 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
729 strlcpy(osp->f_fstypename, nsp->f_fstypename,
730 MIN(MFSNAMELEN, OMFSNAMELEN));
731 strlcpy(osp->f_mntonname, nsp->f_mntonname,
732 MIN(MNAMELEN, OMNAMELEN));
733 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
734 MIN(MNAMELEN, OMNAMELEN));
735 osp->f_fsid = nsp->f_fsid;
736 }
737 #endif /* COMPAT_FREEBSD4 */
738
739 #if defined(COMPAT_FREEBSD11)
740 /*
741 * Get old format filesystem statistics.
742 */
743 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *);
744
745 int
freebsd11_statfs(struct thread * td,struct freebsd11_statfs_args * uap)746 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap)
747 {
748 struct freebsd11_statfs osb;
749 struct statfs *sfp;
750 int error;
751
752 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
753 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
754 if (error == 0) {
755 freebsd11_cvtstatfs(sfp, &osb);
756 error = copyout(&osb, uap->buf, sizeof(osb));
757 }
758 free(sfp, M_STATFS);
759 return (error);
760 }
761
762 /*
763 * Get filesystem statistics.
764 */
765 int
freebsd11_fstatfs(struct thread * td,struct freebsd11_fstatfs_args * uap)766 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap)
767 {
768 struct freebsd11_statfs osb;
769 struct statfs *sfp;
770 int error;
771
772 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
773 error = kern_fstatfs(td, uap->fd, sfp);
774 if (error == 0) {
775 freebsd11_cvtstatfs(sfp, &osb);
776 error = copyout(&osb, uap->buf, sizeof(osb));
777 }
778 free(sfp, M_STATFS);
779 return (error);
780 }
781
782 /*
783 * Get statistics on all filesystems.
784 */
785 int
freebsd11_getfsstat(struct thread * td,struct freebsd11_getfsstat_args * uap)786 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap)
787 {
788 return (kern_freebsd11_getfsstat(td, uap->buf, uap->bufsize, uap->mode));
789 }
790
791 int
kern_freebsd11_getfsstat(struct thread * td,struct freebsd11_statfs * ubuf,long bufsize,int mode)792 kern_freebsd11_getfsstat(struct thread *td, struct freebsd11_statfs * ubuf,
793 long bufsize, int mode)
794 {
795 struct freebsd11_statfs osb;
796 struct statfs *buf, *sp;
797 size_t count, size;
798 int error;
799
800 if (bufsize < 0)
801 return (EINVAL);
802
803 count = bufsize / sizeof(struct ostatfs);
804 size = count * sizeof(struct statfs);
805 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, mode);
806 if (error == 0)
807 td->td_retval[0] = count;
808 if (size > 0) {
809 sp = buf;
810 while (count > 0 && error == 0) {
811 freebsd11_cvtstatfs(sp, &osb);
812 error = copyout(&osb, ubuf, sizeof(osb));
813 sp++;
814 ubuf++;
815 count--;
816 }
817 free(buf, M_STATFS);
818 }
819 return (error);
820 }
821
822 /*
823 * Implement fstatfs() for (NFS) file handles.
824 */
825 int
freebsd11_fhstatfs(struct thread * td,struct freebsd11_fhstatfs_args * uap)826 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap)
827 {
828 struct freebsd11_statfs osb;
829 struct statfs *sfp;
830 fhandle_t fh;
831 int error;
832
833 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
834 if (error)
835 return (error);
836 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
837 error = kern_fhstatfs(td, fh, sfp);
838 if (error == 0) {
839 freebsd11_cvtstatfs(sfp, &osb);
840 error = copyout(&osb, uap->buf, sizeof(osb));
841 }
842 free(sfp, M_STATFS);
843 return (error);
844 }
845
846 /*
847 * Convert a new format statfs structure to an old format statfs structure.
848 */
849 static void
freebsd11_cvtstatfs(struct statfs * nsp,struct freebsd11_statfs * osp)850 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp)
851 {
852
853 bzero(osp, sizeof(*osp));
854 osp->f_version = FREEBSD11_STATFS_VERSION;
855 osp->f_type = nsp->f_type;
856 osp->f_flags = nsp->f_flags;
857 osp->f_bsize = nsp->f_bsize;
858 osp->f_iosize = nsp->f_iosize;
859 osp->f_blocks = nsp->f_blocks;
860 osp->f_bfree = nsp->f_bfree;
861 osp->f_bavail = nsp->f_bavail;
862 osp->f_files = nsp->f_files;
863 osp->f_ffree = nsp->f_ffree;
864 osp->f_syncwrites = nsp->f_syncwrites;
865 osp->f_asyncwrites = nsp->f_asyncwrites;
866 osp->f_syncreads = nsp->f_syncreads;
867 osp->f_asyncreads = nsp->f_asyncreads;
868 osp->f_namemax = nsp->f_namemax;
869 osp->f_owner = nsp->f_owner;
870 osp->f_fsid = nsp->f_fsid;
871 strlcpy(osp->f_fstypename, nsp->f_fstypename,
872 MIN(MFSNAMELEN, sizeof(osp->f_fstypename)));
873 strlcpy(osp->f_mntonname, nsp->f_mntonname,
874 MIN(MNAMELEN, sizeof(osp->f_mntonname)));
875 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
876 MIN(MNAMELEN, sizeof(osp->f_mntfromname)));
877 }
878 #endif /* COMPAT_FREEBSD11 */
879
880 /*
881 * Change current working directory to a given file descriptor.
882 */
883 #ifndef _SYS_SYSPROTO_H_
884 struct fchdir_args {
885 int fd;
886 };
887 #endif
888 int
sys_fchdir(struct thread * td,struct fchdir_args * uap)889 sys_fchdir(struct thread *td, struct fchdir_args *uap)
890 {
891 struct vnode *vp, *tdp;
892 struct mount *mp;
893 struct file *fp;
894 int error;
895 uint8_t fdflags;
896
897 AUDIT_ARG_FD(uap->fd);
898 error = getvnode_path(td, uap->fd, &cap_fchdir_rights, &fdflags,
899 &fp);
900 if (error != 0)
901 return (error);
902 if ((fdflags & UF_RESOLVE_BENEATH) != 0) {
903 fdrop(fp, td);
904 return (ENOTCAPABLE);
905 }
906 vp = fp->f_vnode;
907 vrefact(vp);
908 fdrop(fp, td);
909 vn_lock(vp, LK_SHARED | LK_RETRY);
910 AUDIT_ARG_VNODE1(vp);
911 error = change_dir(vp, td);
912 while (!error && (mp = vp->v_mountedhere) != NULL) {
913 if (vfs_busy(mp, 0))
914 continue;
915 error = VFS_ROOT(mp, LK_SHARED, &tdp);
916 vfs_unbusy(mp);
917 if (error != 0)
918 break;
919 vput(vp);
920 vp = tdp;
921 }
922 if (error != 0) {
923 vput(vp);
924 return (error);
925 }
926 VOP_UNLOCK(vp);
927 pwd_chdir(td, vp);
928 return (0);
929 }
930
931 /*
932 * Change current working directory (``.'').
933 */
934 #ifndef _SYS_SYSPROTO_H_
935 struct chdir_args {
936 char *path;
937 };
938 #endif
939 int
sys_chdir(struct thread * td,struct chdir_args * uap)940 sys_chdir(struct thread *td, struct chdir_args *uap)
941 {
942
943 return (kern_chdir(td, uap->path, UIO_USERSPACE));
944 }
945
946 int
kern_chdir(struct thread * td,const char * path,enum uio_seg pathseg)947 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg)
948 {
949 struct nameidata nd;
950 int error;
951
952 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
953 pathseg, path);
954 if ((error = namei(&nd)) != 0)
955 return (error);
956 if ((error = change_dir(nd.ni_vp, td)) != 0) {
957 vput(nd.ni_vp);
958 NDFREE_PNBUF(&nd);
959 return (error);
960 }
961 VOP_UNLOCK(nd.ni_vp);
962 NDFREE_PNBUF(&nd);
963 pwd_chdir(td, nd.ni_vp);
964 return (0);
965 }
966
967 static int unprivileged_chroot = 0;
968 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_chroot, CTLFLAG_RW,
969 &unprivileged_chroot, 0,
970 "Unprivileged processes can use chroot(2)");
971
972 /*
973 * Takes locked vnode, unlocks it before returning.
974 */
975 static int
kern_chroot(struct thread * td,struct vnode * vp)976 kern_chroot(struct thread *td, struct vnode *vp)
977 {
978 struct proc *p;
979 int error;
980
981 error = priv_check(td, PRIV_VFS_CHROOT);
982 if (error != 0) {
983 p = td->td_proc;
984 if (unprivileged_chroot == 0) {
985 error = EXTERROR(EPERM,
986 "security.bsd.unprivileged_chroot sysctl not enabled");
987 goto e_vunlock;
988 }
989 if ((p->p_flag2 & P2_NO_NEW_PRIVS) == 0) {
990 error = EXTERROR(EPERM,
991 "PROC_NO_NEW_PRIVS not enabled");
992 goto e_vunlock;
993 }
994 }
995
996 error = change_dir(vp, td);
997 if (error != 0)
998 goto e_vunlock;
999 #ifdef MAC
1000 error = mac_vnode_check_chroot(td->td_ucred, vp);
1001 if (error != 0)
1002 goto e_vunlock;
1003 #endif
1004 VOP_UNLOCK(vp);
1005 error = pwd_chroot(td, vp);
1006 vrele(vp);
1007 return (error);
1008 e_vunlock:
1009 vput(vp);
1010 return (error);
1011 }
1012
1013 /*
1014 * Change notion of root (``/'') directory.
1015 */
1016 #ifndef _SYS_SYSPROTO_H_
1017 struct chroot_args {
1018 char *path;
1019 };
1020 #endif
1021 int
sys_chroot(struct thread * td,struct chroot_args * uap)1022 sys_chroot(struct thread *td, struct chroot_args *uap)
1023 {
1024 struct nameidata nd;
1025 int error;
1026
1027 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
1028 UIO_USERSPACE, uap->path);
1029 error = namei(&nd);
1030 if (error != 0)
1031 return (error);
1032 NDFREE_PNBUF(&nd);
1033 error = kern_chroot(td, nd.ni_vp);
1034 return (error);
1035 }
1036
1037 /*
1038 * Change notion of root directory to a given file descriptor.
1039 */
1040 #ifndef _SYS_SYSPROTO_H_
1041 struct fchroot_args {
1042 int fd;
1043 };
1044 #endif
1045 int
sys_fchroot(struct thread * td,struct fchroot_args * uap)1046 sys_fchroot(struct thread *td, struct fchroot_args *uap)
1047 {
1048 struct vnode *vp;
1049 struct file *fp;
1050 int error;
1051 uint8_t fdflags;
1052
1053 error = getvnode_path(td, uap->fd, &cap_fchroot_rights, &fdflags, &fp);
1054 if (error != 0)
1055 return (error);
1056 if ((fdflags & UF_RESOLVE_BENEATH) != 0) {
1057 fdrop(fp, td);
1058 return (ENOTCAPABLE);
1059 }
1060 vp = fp->f_vnode;
1061 vrefact(vp);
1062 fdrop(fp, td);
1063 vn_lock(vp, LK_SHARED | LK_RETRY);
1064 error = kern_chroot(td, vp);
1065 return (error);
1066 }
1067
1068 /*
1069 * Common routine for chroot and chdir. Callers must provide a locked vnode
1070 * instance.
1071 */
1072 int
change_dir(struct vnode * vp,struct thread * td)1073 change_dir(struct vnode *vp, struct thread *td)
1074 {
1075 #ifdef MAC
1076 int error;
1077 #endif
1078
1079 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
1080 if (vp->v_type != VDIR)
1081 return (ENOTDIR);
1082 #ifdef MAC
1083 error = mac_vnode_check_chdir(td->td_ucred, vp);
1084 if (error != 0)
1085 return (error);
1086 #endif
1087 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
1088 }
1089
1090 static __inline void
flags_to_rights(int flags,cap_rights_t * rightsp)1091 flags_to_rights(int flags, cap_rights_t *rightsp)
1092 {
1093 if (flags & O_EXEC) {
1094 cap_rights_set_one(rightsp, CAP_FEXECVE);
1095 if (flags & O_PATH)
1096 return;
1097 } else {
1098 switch ((flags & O_ACCMODE)) {
1099 case O_RDONLY:
1100 cap_rights_set_one(rightsp, CAP_READ);
1101 break;
1102 case O_RDWR:
1103 cap_rights_set_one(rightsp, CAP_READ);
1104 /* FALLTHROUGH */
1105 case O_WRONLY:
1106 cap_rights_set_one(rightsp, CAP_WRITE);
1107 if (!(flags & (O_APPEND | O_TRUNC)))
1108 cap_rights_set_one(rightsp, CAP_SEEK);
1109 break;
1110 }
1111 }
1112
1113 if (flags & O_CREAT)
1114 cap_rights_set_one(rightsp, CAP_CREATE);
1115
1116 if (flags & O_TRUNC)
1117 cap_rights_set_one(rightsp, CAP_FTRUNCATE);
1118
1119 if (flags & (O_SYNC | O_FSYNC | O_DSYNC))
1120 cap_rights_set_one(rightsp, CAP_FSYNC);
1121
1122 if (flags & (O_EXLOCK | O_SHLOCK))
1123 cap_rights_set_one(rightsp, CAP_FLOCK);
1124 }
1125
1126 /*
1127 * Check permissions, allocate an open file structure, and call the device
1128 * open routine if any.
1129 */
1130 #ifndef _SYS_SYSPROTO_H_
1131 struct open_args {
1132 char *path;
1133 int flags;
1134 int mode;
1135 };
1136 #endif
1137 int
sys_open(struct thread * td,struct open_args * uap)1138 sys_open(struct thread *td, struct open_args *uap)
1139 {
1140
1141 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1142 uap->flags, uap->mode));
1143 }
1144
1145 #ifndef _SYS_SYSPROTO_H_
1146 struct openat_args {
1147 int fd;
1148 char *path;
1149 int flag;
1150 int mode;
1151 };
1152 #endif
1153 int
sys_openat(struct thread * td,struct openat_args * uap)1154 sys_openat(struct thread *td, struct openat_args *uap)
1155 {
1156
1157 AUDIT_ARG_FD(uap->fd);
1158 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1159 uap->mode));
1160 }
1161
1162 /*
1163 * Validate open(2) flags and convert access mode flags (O_RDONLY etc.) to their
1164 * in-kernel representations (FREAD etc.).
1165 */
1166 static int
openflags(int * flagsp)1167 openflags(int *flagsp)
1168 {
1169 int flags;
1170
1171 flags = *flagsp;
1172 if ((flags & ~FUSERALLOWED) != 0)
1173 return (EINVAL);
1174
1175 /*
1176 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1177 * may be specified. On the other hand, for O_PATH any mode
1178 * except O_EXEC is ignored.
1179 */
1180 if ((flags & O_PATH) != 0) {
1181 flags &= ~O_ACCMODE;
1182 } else if ((flags & O_EXEC) != 0) {
1183 if ((flags & O_ACCMODE) != 0)
1184 return (EINVAL);
1185 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1186 return (EINVAL);
1187 } else {
1188 flags = FFLAGS(flags);
1189 }
1190 *flagsp = flags;
1191 return (0);
1192 }
1193
1194 static void
finit_open(struct file * fp,struct vnode * vp,int flags)1195 finit_open(struct file *fp, struct vnode *vp, int flags)
1196 {
1197 /*
1198 * Store the vnode, for any f_type. Typically, the vnode use count is
1199 * decremented by a direct call to vnops.fo_close() for files that
1200 * switched type.
1201 */
1202 fp->f_vnode = vp;
1203
1204 /*
1205 * If the file wasn't claimed by devfs or fifofs, bind it to the normal
1206 * vnode operations here.
1207 */
1208 if (fp->f_ops == &badfileops) {
1209 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0,
1210 ("Unexpected fifo fp %p vp %p", fp, vp));
1211 if ((flags & O_PATH) != 0) {
1212 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED),
1213 DTYPE_VNODE, NULL, &path_fileops);
1214 } else {
1215 finit_vnode(fp, flags, NULL, &vnops);
1216 }
1217 }
1218 }
1219
1220 /*
1221 * If fpp != NULL, opened file is not installed into the file
1222 * descriptor table, instead it is returned in *fpp. This is
1223 * incompatible with fdopen(), in which case we return EINVAL.
1224 */
1225 static int
openatfp(struct thread * td,int dirfd,const char * path,enum uio_seg pathseg,int flags,int mode,struct file ** fpp)1226 openatfp(struct thread *td, int dirfd, const char *path,
1227 enum uio_seg pathseg, int flags, int mode, struct file **fpp)
1228 {
1229 struct proc *p;
1230 struct filedesc *fdp;
1231 struct pwddesc *pdp;
1232 struct file *fp;
1233 struct vnode *vp;
1234 struct filecaps *fcaps;
1235 struct nameidata nd;
1236 cap_rights_t rights;
1237 int cmode, error, indx;
1238
1239 indx = -1;
1240 p = td->td_proc;
1241 fdp = p->p_fd;
1242 pdp = p->p_pd;
1243
1244 AUDIT_ARG_FFLAGS(flags);
1245 AUDIT_ARG_MODE(mode);
1246 cap_rights_init_one(&rights, CAP_LOOKUP);
1247 flags_to_rights(flags, &rights);
1248
1249 error = openflags(&flags);
1250 if (error != 0)
1251 return (error);
1252
1253 /*
1254 * Allocate a file structure. The descriptor to reference it
1255 * is allocated and used by finstall_refed() below.
1256 */
1257 error = falloc_noinstall(td, &fp);
1258 if (error != 0)
1259 return (error);
1260 /* Set the flags early so the finit in devfs can pick them up. */
1261 fp->f_flag = flags & FMASK;
1262 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT;
1263 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | WANTIOCTLCAPS,
1264 pathseg, path, dirfd, &rights);
1265 td->td_dupfd = -1; /* XXX check for fdopen */
1266 error = vn_open_cred(&nd, &flags, cmode, VN_OPEN_WANTIOCTLCAPS,
1267 td->td_ucred, fp);
1268 if (error != 0) {
1269 /*
1270 * If the vn_open replaced the method vector, something
1271 * wonderous happened deep below and we just pass it up
1272 * pretending we know what we do.
1273 */
1274 if (error == ENXIO && fp->f_ops != &badfileops) {
1275 MPASS((flags & O_PATH) == 0);
1276 goto success;
1277 }
1278
1279 /*
1280 * Handle special fdopen() case. bleh.
1281 *
1282 * Don't do this for relative (capability) lookups; we don't
1283 * understand exactly what would happen, and we don't think
1284 * that it ever should.
1285 */
1286 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 &&
1287 (error == ENODEV || error == ENXIO) &&
1288 td->td_dupfd >= 0) {
1289 MPASS(fpp == NULL);
1290 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1291 &indx);
1292 if (error == 0)
1293 goto success;
1294 }
1295
1296 goto bad;
1297 }
1298 td->td_dupfd = 0;
1299 NDFREE_PNBUF(&nd);
1300 vp = nd.ni_vp;
1301
1302 finit_open(fp, vp, flags);
1303 VOP_UNLOCK(vp);
1304 if (flags & O_TRUNC) {
1305 error = fo_truncate(fp, 0, td->td_ucred, td);
1306 if (error != 0)
1307 goto bad;
1308 }
1309 success:
1310 if (fpp != NULL) {
1311 MPASS(error == 0);
1312 NDFREE_IOCTLCAPS(&nd);
1313 *fpp = fp;
1314 return (0);
1315 }
1316
1317 /*
1318 * If we haven't already installed the FD (for dupfdopen), do so now.
1319 */
1320 if (indx == -1) {
1321 #ifdef CAPABILITIES
1322 if ((nd.ni_resflags & NIRES_STRICTREL) != 0)
1323 fcaps = &nd.ni_filecaps;
1324 else
1325 #endif
1326 fcaps = NULL;
1327 if ((nd.ni_resflags & NIRES_BENEATH) != 0)
1328 flags |= O_RESOLVE_BENEATH;
1329 else
1330 flags &= ~O_RESOLVE_BENEATH;
1331 error = finstall_refed(td, fp, &indx, flags, fcaps);
1332 /* On success finstall_refed() consumes fcaps. */
1333 if (error != 0) {
1334 goto bad;
1335 }
1336 } else {
1337 NDFREE_IOCTLCAPS(&nd);
1338 falloc_abort(td, fp);
1339 }
1340
1341 td->td_retval[0] = indx;
1342 return (0);
1343 bad:
1344 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1345 NDFREE_IOCTLCAPS(&nd);
1346 falloc_abort(td, fp);
1347 return (error);
1348 }
1349
1350 int
kern_openat(struct thread * td,int dirfd,const char * path,enum uio_seg pathseg,int flags,int mode)1351 kern_openat(struct thread *td, int dirfd, const char *path,
1352 enum uio_seg pathseg, int flags, int mode)
1353 {
1354 return (openatfp(td, dirfd, path, pathseg, flags, mode, NULL));
1355 }
1356
1357 int
kern_openatfp(struct thread * td,int dirfd,const char * path,enum uio_seg pathseg,int flags,int mode,struct file ** fpp)1358 kern_openatfp(struct thread *td, int dirfd, const char *path,
1359 enum uio_seg pathseg, int flags, int mode, struct file **fpp)
1360 {
1361 int error, old_dupfd;
1362
1363 old_dupfd = td->td_dupfd;
1364 td->td_dupfd = -1;
1365 error = openatfp(td, dirfd, path, pathseg, flags, mode, fpp);
1366 td->td_dupfd = old_dupfd;
1367 return (error);
1368 }
1369
1370 #ifdef COMPAT_43
1371 /*
1372 * Create a file.
1373 */
1374 #ifndef _SYS_SYSPROTO_H_
1375 struct ocreat_args {
1376 char *path;
1377 int mode;
1378 };
1379 #endif
1380 int
ocreat(struct thread * td,struct ocreat_args * uap)1381 ocreat(struct thread *td, struct ocreat_args *uap)
1382 {
1383
1384 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1385 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1386 }
1387 #endif /* COMPAT_43 */
1388
1389 /*
1390 * Create a special file.
1391 */
1392 #ifndef _SYS_SYSPROTO_H_
1393 struct mknodat_args {
1394 int fd;
1395 char *path;
1396 mode_t mode;
1397 dev_t dev;
1398 };
1399 #endif
1400 int
sys_mknodat(struct thread * td,struct mknodat_args * uap)1401 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1402 {
1403
1404 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1405 uap->dev));
1406 }
1407
1408 #if defined(COMPAT_FREEBSD11)
1409 int
freebsd11_mknod(struct thread * td,struct freebsd11_mknod_args * uap)1410 freebsd11_mknod(struct thread *td,
1411 struct freebsd11_mknod_args *uap)
1412 {
1413
1414 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1415 uap->mode, uap->dev));
1416 }
1417
1418 int
freebsd11_mknodat(struct thread * td,struct freebsd11_mknodat_args * uap)1419 freebsd11_mknodat(struct thread *td,
1420 struct freebsd11_mknodat_args *uap)
1421 {
1422
1423 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1424 uap->dev));
1425 }
1426 #endif /* COMPAT_FREEBSD11 */
1427
1428 int
kern_mknodat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int mode,dev_t dev)1429 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg,
1430 int mode, dev_t dev)
1431 {
1432 struct vnode *vp;
1433 struct mount *mp;
1434 struct vattr vattr;
1435 struct nameidata nd;
1436 int error, whiteout = 0;
1437
1438 AUDIT_ARG_MODE(mode);
1439 AUDIT_ARG_DEV(dev);
1440 switch (mode & S_IFMT) {
1441 case S_IFCHR:
1442 case S_IFBLK:
1443 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1444 if (error == 0 && dev == VNOVAL)
1445 error = EINVAL;
1446 break;
1447 case S_IFWHT:
1448 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1449 break;
1450 case S_IFIFO:
1451 if (dev == 0)
1452 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1453 /* FALLTHROUGH */
1454 default:
1455 error = EINVAL;
1456 break;
1457 }
1458 if (error != 0)
1459 return (error);
1460 NDPREINIT(&nd);
1461 restart:
1462 bwillwrite();
1463 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE,
1464 pathseg, path, fd, &cap_mknodat_rights);
1465 if ((error = namei(&nd)) != 0)
1466 return (error);
1467 vp = nd.ni_vp;
1468 if (vp != NULL) {
1469 NDFREE_PNBUF(&nd);
1470 if (vp == nd.ni_dvp)
1471 vrele(nd.ni_dvp);
1472 else
1473 vput(nd.ni_dvp);
1474 vrele(vp);
1475 return (EEXIST);
1476 } else if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) {
1477 NDFREE_PNBUF(&nd);
1478 vput(nd.ni_dvp);
1479 return (EINVAL);
1480 } else {
1481 VATTR_NULL(&vattr);
1482 vattr.va_mode = (mode & ALLPERMS) &
1483 ~td->td_proc->p_pd->pd_cmask;
1484 vattr.va_rdev = dev;
1485 whiteout = 0;
1486
1487 switch (mode & S_IFMT) {
1488 case S_IFCHR:
1489 vattr.va_type = VCHR;
1490 break;
1491 case S_IFBLK:
1492 vattr.va_type = VBLK;
1493 break;
1494 case S_IFWHT:
1495 whiteout = 1;
1496 break;
1497 default:
1498 panic("kern_mknod: invalid mode");
1499 }
1500 }
1501 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1502 NDFREE_PNBUF(&nd);
1503 vput(nd.ni_dvp);
1504 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1505 return (error);
1506 goto restart;
1507 }
1508 #ifdef MAC
1509 if (error == 0 && !whiteout)
1510 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1511 &nd.ni_cnd, &vattr);
1512 #endif
1513 if (error == 0) {
1514 if (whiteout)
1515 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1516 else {
1517 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1518 &nd.ni_cnd, &vattr);
1519 }
1520 }
1521 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL,
1522 true);
1523 vn_finished_write(mp);
1524 NDFREE_PNBUF(&nd);
1525 if (error == ERELOOKUP)
1526 goto restart;
1527 return (error);
1528 }
1529
1530 /*
1531 * Create a named pipe.
1532 */
1533 #ifndef _SYS_SYSPROTO_H_
1534 struct mkfifo_args {
1535 char *path;
1536 int mode;
1537 };
1538 #endif
1539 int
sys_mkfifo(struct thread * td,struct mkfifo_args * uap)1540 sys_mkfifo(struct thread *td, struct mkfifo_args *uap)
1541 {
1542
1543 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1544 uap->mode));
1545 }
1546
1547 #ifndef _SYS_SYSPROTO_H_
1548 struct mkfifoat_args {
1549 int fd;
1550 char *path;
1551 mode_t mode;
1552 };
1553 #endif
1554 int
sys_mkfifoat(struct thread * td,struct mkfifoat_args * uap)1555 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1556 {
1557
1558 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1559 uap->mode));
1560 }
1561
1562 int
kern_mkfifoat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int mode)1563 kern_mkfifoat(struct thread *td, int fd, const char *path,
1564 enum uio_seg pathseg, int mode)
1565 {
1566 struct mount *mp;
1567 struct vattr vattr;
1568 struct nameidata nd;
1569 int error;
1570
1571 AUDIT_ARG_MODE(mode);
1572 NDPREINIT(&nd);
1573 restart:
1574 bwillwrite();
1575 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE,
1576 pathseg, path, fd, &cap_mkfifoat_rights);
1577 if ((error = namei(&nd)) != 0)
1578 return (error);
1579 if (nd.ni_vp != NULL) {
1580 NDFREE_PNBUF(&nd);
1581 if (nd.ni_vp == nd.ni_dvp)
1582 vrele(nd.ni_dvp);
1583 else
1584 vput(nd.ni_dvp);
1585 vrele(nd.ni_vp);
1586 return (EEXIST);
1587 }
1588 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) {
1589 NDFREE_PNBUF(&nd);
1590 vput(nd.ni_dvp);
1591 return (EINVAL);
1592 }
1593 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1594 NDFREE_PNBUF(&nd);
1595 vput(nd.ni_dvp);
1596 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1597 return (error);
1598 goto restart;
1599 }
1600 VATTR_NULL(&vattr);
1601 vattr.va_type = VFIFO;
1602 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask;
1603 #ifdef MAC
1604 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1605 &vattr);
1606 if (error != 0)
1607 goto out;
1608 #endif
1609 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1610 #ifdef MAC
1611 out:
1612 #endif
1613 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
1614 vn_finished_write(mp);
1615 NDFREE_PNBUF(&nd);
1616 if (error == ERELOOKUP)
1617 goto restart;
1618 return (error);
1619 }
1620
1621 /*
1622 * Make a hard file link.
1623 */
1624 #ifndef _SYS_SYSPROTO_H_
1625 struct link_args {
1626 char *path;
1627 char *link;
1628 };
1629 #endif
1630 int
sys_link(struct thread * td,struct link_args * uap)1631 sys_link(struct thread *td, struct link_args *uap)
1632 {
1633
1634 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
1635 UIO_USERSPACE, AT_SYMLINK_FOLLOW));
1636 }
1637
1638 #ifndef _SYS_SYSPROTO_H_
1639 struct linkat_args {
1640 int fd1;
1641 char *path1;
1642 int fd2;
1643 char *path2;
1644 int flag;
1645 };
1646 #endif
1647 int
sys_linkat(struct thread * td,struct linkat_args * uap)1648 sys_linkat(struct thread *td, struct linkat_args *uap)
1649 {
1650
1651 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1652 UIO_USERSPACE, uap->flag));
1653 }
1654
1655 int hardlink_check_uid = 0;
1656 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1657 &hardlink_check_uid, 0,
1658 "Unprivileged processes cannot create hard links to files owned by other "
1659 "users");
1660 static int hardlink_check_gid = 0;
1661 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1662 &hardlink_check_gid, 0,
1663 "Unprivileged processes cannot create hard links to files owned by other "
1664 "groups");
1665
1666 static int
can_hardlink(struct vnode * vp,struct ucred * cred)1667 can_hardlink(struct vnode *vp, struct ucred *cred)
1668 {
1669 struct vattr va;
1670 int error;
1671
1672 if (!hardlink_check_uid && !hardlink_check_gid)
1673 return (0);
1674
1675 error = VOP_GETATTR(vp, &va, cred);
1676 if (error != 0)
1677 return (error);
1678
1679 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1680 error = priv_check_cred(cred, PRIV_VFS_LINK);
1681 if (error != 0)
1682 return (error);
1683 }
1684
1685 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1686 error = priv_check_cred(cred, PRIV_VFS_LINK);
1687 if (error != 0)
1688 return (error);
1689 }
1690
1691 return (0);
1692 }
1693
1694 int
kern_linkat(struct thread * td,int fd1,int fd2,const char * path1,const char * path2,enum uio_seg segflag,int flag)1695 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1,
1696 const char *path2, enum uio_seg segflag, int flag)
1697 {
1698 struct nameidata nd;
1699 int error;
1700
1701 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH |
1702 AT_EMPTY_PATH)) != 0)
1703 return (EINVAL);
1704
1705 NDPREINIT(&nd);
1706 do {
1707 bwillwrite();
1708 NDINIT_ATRIGHTS(&nd, LOOKUP, AUDITVNODE1 | at2cnpflags(flag,
1709 AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH | AT_EMPTY_PATH),
1710 segflag, path1, fd1, &cap_linkat_source_rights);
1711 if ((error = namei(&nd)) != 0)
1712 return (error);
1713 NDFREE_PNBUF(&nd);
1714 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) {
1715 error = priv_check(td, PRIV_VFS_FHOPEN);
1716 if (error != 0) {
1717 vrele(nd.ni_vp);
1718 return (error);
1719 }
1720 }
1721 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag);
1722 } while (error == EAGAIN || error == ERELOOKUP);
1723 return (error);
1724 }
1725
1726 static int
kern_linkat_vp(struct thread * td,struct vnode * vp,int fd,const char * path,enum uio_seg segflag)1727 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path,
1728 enum uio_seg segflag)
1729 {
1730 struct nameidata nd;
1731 struct mount *mp;
1732 int error;
1733
1734 if (vp->v_type == VDIR) {
1735 vrele(vp);
1736 return (EPERM); /* POSIX */
1737 }
1738 if ((vn_irflag_read(vp) & (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0) {
1739 vrele(vp);
1740 return (EINVAL);
1741 }
1742 NDINIT_ATRIGHTS(&nd, CREATE,
1743 LOCKPARENT | AUDITVNODE2 | NOCACHE, segflag, path, fd,
1744 &cap_linkat_target_rights);
1745 if ((error = namei(&nd)) == 0) {
1746 if (nd.ni_vp != NULL) {
1747 NDFREE_PNBUF(&nd);
1748 if (nd.ni_dvp == nd.ni_vp)
1749 vrele(nd.ni_dvp);
1750 else
1751 vput(nd.ni_dvp);
1752 vrele(nd.ni_vp);
1753 vrele(vp);
1754 return (EEXIST);
1755 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1756 /*
1757 * Cross-device link. No need to recheck
1758 * vp->v_type, since it cannot change, except
1759 * to VBAD.
1760 */
1761 NDFREE_PNBUF(&nd);
1762 vput(nd.ni_dvp);
1763 vrele(vp);
1764 return (EXDEV);
1765 } else if (vn_lock(vp, LK_EXCLUSIVE) == 0) {
1766 error = can_hardlink(vp, td->td_ucred);
1767 #ifdef MAC
1768 if (error == 0)
1769 error = mac_vnode_check_link(td->td_ucred,
1770 nd.ni_dvp, vp, &nd.ni_cnd);
1771 #endif
1772 if (error != 0) {
1773 vput(vp);
1774 vput(nd.ni_dvp);
1775 NDFREE_PNBUF(&nd);
1776 return (error);
1777 }
1778 error = vn_start_write(vp, &mp, V_NOWAIT);
1779 if (error != 0) {
1780 vput(vp);
1781 vput(nd.ni_dvp);
1782 NDFREE_PNBUF(&nd);
1783 error = vn_start_write(NULL, &mp,
1784 V_XSLEEP | V_PCATCH);
1785 if (error != 0)
1786 return (error);
1787 return (EAGAIN);
1788 }
1789 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1790 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true);
1791 vn_finished_write(mp);
1792 NDFREE_PNBUF(&nd);
1793 vp = NULL;
1794 } else {
1795 vput(nd.ni_dvp);
1796 NDFREE_PNBUF(&nd);
1797 vrele(vp);
1798 return (EAGAIN);
1799 }
1800 }
1801 if (vp != NULL)
1802 vrele(vp);
1803 return (error);
1804 }
1805
1806 /*
1807 * Make a symbolic link.
1808 */
1809 #ifndef _SYS_SYSPROTO_H_
1810 struct symlink_args {
1811 char *path;
1812 char *link;
1813 };
1814 #endif
1815 int
sys_symlink(struct thread * td,struct symlink_args * uap)1816 sys_symlink(struct thread *td, struct symlink_args *uap)
1817 {
1818
1819 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
1820 UIO_USERSPACE));
1821 }
1822
1823 #ifndef _SYS_SYSPROTO_H_
1824 struct symlinkat_args {
1825 char *path;
1826 int fd;
1827 char *path2;
1828 };
1829 #endif
1830 int
sys_symlinkat(struct thread * td,struct symlinkat_args * uap)1831 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1832 {
1833
1834 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1835 UIO_USERSPACE));
1836 }
1837
1838 int
kern_symlinkat(struct thread * td,const char * path1,int fd,const char * path2,enum uio_seg segflg)1839 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2,
1840 enum uio_seg segflg)
1841 {
1842 struct mount *mp;
1843 struct vattr vattr;
1844 const char *syspath;
1845 char *tmppath;
1846 struct nameidata nd;
1847 int error;
1848
1849 if (segflg == UIO_SYSSPACE) {
1850 syspath = path1;
1851 } else {
1852 tmppath = uma_zalloc(namei_zone, M_WAITOK);
1853 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0)
1854 goto out;
1855 syspath = tmppath;
1856 }
1857 AUDIT_ARG_TEXT(syspath);
1858 NDPREINIT(&nd);
1859 restart:
1860 bwillwrite();
1861 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 | NOCACHE, segflg,
1862 path2, fd, &cap_symlinkat_rights);
1863 if ((error = namei(&nd)) != 0)
1864 goto out;
1865 if (nd.ni_vp) {
1866 NDFREE_PNBUF(&nd);
1867 if (nd.ni_vp == nd.ni_dvp)
1868 vrele(nd.ni_dvp);
1869 else
1870 vput(nd.ni_dvp);
1871 vrele(nd.ni_vp);
1872 nd.ni_vp = NULL;
1873 error = EEXIST;
1874 goto out;
1875 }
1876 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1877 NDFREE_PNBUF(&nd);
1878 vput(nd.ni_dvp);
1879 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1880 goto out;
1881 goto restart;
1882 }
1883 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) {
1884 error = EINVAL;
1885 goto out;
1886 }
1887 VATTR_NULL(&vattr);
1888 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask;
1889 #ifdef MAC
1890 vattr.va_type = VLNK;
1891 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1892 &vattr);
1893 if (error != 0)
1894 goto out2;
1895 #endif
1896 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1897 #ifdef MAC
1898 out2:
1899 #endif
1900 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
1901 vn_finished_write(mp);
1902 NDFREE_PNBUF(&nd);
1903 if (error == ERELOOKUP)
1904 goto restart;
1905 out:
1906 if (segflg != UIO_SYSSPACE)
1907 uma_zfree(namei_zone, tmppath);
1908 return (error);
1909 }
1910
1911 /*
1912 * Delete a whiteout from the filesystem.
1913 */
1914 #ifndef _SYS_SYSPROTO_H_
1915 struct undelete_args {
1916 char *path;
1917 };
1918 #endif
1919 int
sys_undelete(struct thread * td,struct undelete_args * uap)1920 sys_undelete(struct thread *td, struct undelete_args *uap)
1921 {
1922 struct mount *mp;
1923 struct nameidata nd;
1924 int error;
1925
1926 NDPREINIT(&nd);
1927 restart:
1928 bwillwrite();
1929 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1930 UIO_USERSPACE, uap->path);
1931 error = namei(&nd);
1932 if (error != 0)
1933 return (error);
1934
1935 if (nd.ni_vp != NULL || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1936 NDFREE_PNBUF(&nd);
1937 if (nd.ni_vp == nd.ni_dvp)
1938 vrele(nd.ni_dvp);
1939 else
1940 vput(nd.ni_dvp);
1941 if (nd.ni_vp)
1942 vrele(nd.ni_vp);
1943 return (EEXIST);
1944 }
1945 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1946 NDFREE_PNBUF(&nd);
1947 vput(nd.ni_dvp);
1948 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
1949 return (error);
1950 goto restart;
1951 }
1952 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1953 NDFREE_PNBUF(&nd);
1954 vput(nd.ni_dvp);
1955 vn_finished_write(mp);
1956 if (error == ERELOOKUP)
1957 goto restart;
1958 return (error);
1959 }
1960
1961 /*
1962 * Delete a name from the filesystem.
1963 */
1964 #ifndef _SYS_SYSPROTO_H_
1965 struct unlink_args {
1966 char *path;
1967 };
1968 #endif
1969 int
sys_unlink(struct thread * td,struct unlink_args * uap)1970 sys_unlink(struct thread *td, struct unlink_args *uap)
1971 {
1972
1973 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
1974 0, 0));
1975 }
1976
1977 static int
kern_funlinkat_ex(struct thread * td,int dfd,const char * path,int fd,int flag,enum uio_seg pathseg,ino_t oldinum)1978 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd,
1979 int flag, enum uio_seg pathseg, ino_t oldinum)
1980 {
1981
1982 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0)
1983 return (EINVAL);
1984
1985 if ((flag & AT_REMOVEDIR) != 0)
1986 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0));
1987
1988 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0));
1989 }
1990
1991 #ifndef _SYS_SYSPROTO_H_
1992 struct unlinkat_args {
1993 int fd;
1994 char *path;
1995 int flag;
1996 };
1997 #endif
1998 int
sys_unlinkat(struct thread * td,struct unlinkat_args * uap)1999 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
2000 {
2001
2002 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag,
2003 UIO_USERSPACE, 0));
2004 }
2005
2006 #ifndef _SYS_SYSPROTO_H_
2007 struct funlinkat_args {
2008 int dfd;
2009 const char *path;
2010 int fd;
2011 int flag;
2012 };
2013 #endif
2014 int
sys_funlinkat(struct thread * td,struct funlinkat_args * uap)2015 sys_funlinkat(struct thread *td, struct funlinkat_args *uap)
2016 {
2017
2018 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag,
2019 UIO_USERSPACE, 0));
2020 }
2021
2022 int
kern_funlinkat(struct thread * td,int dfd,const char * path,int fd,enum uio_seg pathseg,int flag,ino_t oldinum)2023 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd,
2024 enum uio_seg pathseg, int flag, ino_t oldinum)
2025 {
2026 struct mount *mp;
2027 struct file *fp;
2028 struct vnode *vp;
2029 struct nameidata nd;
2030 struct stat sb;
2031 int error;
2032
2033 fp = NULL;
2034 if (fd != FD_NONE) {
2035 error = getvnode_path(td, fd, &cap_no_rights, NULL, &fp);
2036 if (error != 0)
2037 return (error);
2038 }
2039
2040 NDPREINIT(&nd);
2041 restart:
2042 bwillwrite();
2043 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
2044 at2cnpflags(flag, AT_RESOLVE_BENEATH),
2045 pathseg, path, dfd, &cap_unlinkat_rights);
2046 if ((error = namei(&nd)) != 0) {
2047 if (error == EINVAL)
2048 error = EPERM;
2049 goto fdout;
2050 }
2051 vp = nd.ni_vp;
2052 if (vp->v_type == VDIR && oldinum == 0) {
2053 error = EPERM; /* POSIX */
2054 } else if (oldinum != 0 &&
2055 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED)) == 0) &&
2056 sb.st_ino != oldinum) {
2057 error = EIDRM; /* Identifier removed */
2058 } else if (fp != NULL && fp->f_vnode != vp) {
2059 if (VN_IS_DOOMED(fp->f_vnode))
2060 error = EBADF;
2061 else
2062 error = EDEADLK;
2063 } else {
2064 /*
2065 * The root of a mounted filesystem cannot be deleted.
2066 *
2067 * XXX: can this only be a VDIR case?
2068 */
2069 if (vp->v_vflag & VV_ROOT)
2070 error = EBUSY;
2071 }
2072 if (error == 0) {
2073 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
2074 NDFREE_PNBUF(&nd);
2075 vput(nd.ni_dvp);
2076 if (vp == nd.ni_dvp)
2077 vrele(vp);
2078 else
2079 vput(vp);
2080 if ((error = vn_start_write(NULL, &mp,
2081 V_XSLEEP | V_PCATCH)) != 0) {
2082 goto fdout;
2083 }
2084 goto restart;
2085 }
2086 #ifdef MAC
2087 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
2088 &nd.ni_cnd);
2089 if (error != 0)
2090 goto out;
2091 #endif
2092 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
2093 #ifdef MAC
2094 out:
2095 #endif
2096 vn_finished_write(mp);
2097 }
2098 NDFREE_PNBUF(&nd);
2099 vput(nd.ni_dvp);
2100 if (vp == nd.ni_dvp)
2101 vrele(vp);
2102 else
2103 vput(vp);
2104 if (error == ERELOOKUP)
2105 goto restart;
2106 fdout:
2107 if (fp != NULL)
2108 fdrop(fp, td);
2109 return (error);
2110 }
2111
2112 /*
2113 * Reposition read/write file offset.
2114 */
2115 #ifndef _SYS_SYSPROTO_H_
2116 struct lseek_args {
2117 int fd;
2118 int pad;
2119 off_t offset;
2120 int whence;
2121 };
2122 #endif
2123 int
sys_lseek(struct thread * td,struct lseek_args * uap)2124 sys_lseek(struct thread *td, struct lseek_args *uap)
2125 {
2126
2127 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2128 }
2129
2130 int
kern_lseek(struct thread * td,int fd,off_t offset,int whence)2131 kern_lseek(struct thread *td, int fd, off_t offset, int whence)
2132 {
2133 struct file *fp;
2134 int error;
2135
2136 AUDIT_ARG_FD(fd);
2137 error = fget(td, fd, &cap_seek_rights, &fp);
2138 if (error != 0)
2139 return (error);
2140 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
2141 fo_seek(fp, offset, whence, td) : ESPIPE;
2142 fdrop(fp, td);
2143 return (error);
2144 }
2145
2146 #if defined(COMPAT_43)
2147 /*
2148 * Reposition read/write file offset.
2149 */
2150 #ifndef _SYS_SYSPROTO_H_
2151 struct olseek_args {
2152 int fd;
2153 long offset;
2154 int whence;
2155 };
2156 #endif
2157 int
olseek(struct thread * td,struct olseek_args * uap)2158 olseek(struct thread *td, struct olseek_args *uap)
2159 {
2160
2161 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2162 }
2163 #endif /* COMPAT_43 */
2164
2165 #if defined(COMPAT_FREEBSD6)
2166 /* Version with the 'pad' argument */
2167 int
freebsd6_lseek(struct thread * td,struct freebsd6_lseek_args * uap)2168 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap)
2169 {
2170
2171 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2172 }
2173 #endif
2174
2175 /*
2176 * Check access permissions using passed credentials.
2177 */
2178 static int
vn_access(struct vnode * vp,int user_flags,struct ucred * cred,struct thread * td)2179 vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
2180 struct thread *td)
2181 {
2182 accmode_t accmode;
2183 int error;
2184
2185 /* Flags == 0 means only check for existence. */
2186 if (user_flags == 0)
2187 return (0);
2188
2189 accmode = 0;
2190 if (user_flags & R_OK)
2191 accmode |= VREAD;
2192 if (user_flags & W_OK)
2193 accmode |= VWRITE;
2194 if (user_flags & X_OK)
2195 accmode |= VEXEC;
2196 #ifdef MAC
2197 error = mac_vnode_check_access(cred, vp, accmode);
2198 if (error != 0)
2199 return (error);
2200 #endif
2201 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
2202 error = VOP_ACCESS(vp, accmode, cred, td);
2203 return (error);
2204 }
2205
2206 /*
2207 * Check access permissions using "real" credentials.
2208 */
2209 #ifndef _SYS_SYSPROTO_H_
2210 struct access_args {
2211 char *path;
2212 int amode;
2213 };
2214 #endif
2215 int
sys_access(struct thread * td,struct access_args * uap)2216 sys_access(struct thread *td, struct access_args *uap)
2217 {
2218
2219 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2220 0, uap->amode));
2221 }
2222
2223 #ifndef _SYS_SYSPROTO_H_
2224 struct faccessat_args {
2225 int dirfd;
2226 char *path;
2227 int amode;
2228 int flag;
2229 }
2230 #endif
2231 int
sys_faccessat(struct thread * td,struct faccessat_args * uap)2232 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2233 {
2234
2235 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2236 uap->amode));
2237 }
2238
2239 int
kern_accessat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int flag,int amode)2240 kern_accessat(struct thread *td, int fd, const char *path,
2241 enum uio_seg pathseg, int flag, int amode)
2242 {
2243 struct ucred *cred, *usecred;
2244 struct vnode *vp;
2245 struct nameidata nd;
2246 int error;
2247
2248 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH |
2249 AT_SYMLINK_NOFOLLOW)) != 0)
2250 return (EINVAL);
2251 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
2252 return (EINVAL);
2253
2254 /*
2255 * Create and modify a temporary credential instead of one that
2256 * is potentially shared (if we need one).
2257 */
2258 cred = td->td_ucred;
2259 if ((flag & AT_EACCESS) == 0 &&
2260 ((cred->cr_uid != cred->cr_ruid ||
2261 cred->cr_rgid != cred->cr_gid))) {
2262 usecred = crdup(cred);
2263 usecred->cr_uid = cred->cr_ruid;
2264 usecred->cr_gid = cred->cr_rgid;
2265 td->td_ucred = usecred;
2266 } else
2267 usecred = cred;
2268 AUDIT_ARG_VALUE(amode);
2269 NDINIT_ATRIGHTS(&nd, LOOKUP, LOCKSHARED | LOCKLEAF |
2270 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH | AT_SYMLINK_NOFOLLOW |
2271 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights);
2272 if ((error = namei(&nd)) != 0)
2273 goto out;
2274 vp = nd.ni_vp;
2275
2276 error = vn_access(vp, amode, usecred, td);
2277 NDFREE_PNBUF(&nd);
2278 vput(vp);
2279 out:
2280 if (usecred != cred) {
2281 td->td_ucred = cred;
2282 crfree(usecred);
2283 }
2284 return (error);
2285 }
2286
2287 /*
2288 * Check access permissions using "effective" credentials.
2289 */
2290 #ifndef _SYS_SYSPROTO_H_
2291 struct eaccess_args {
2292 char *path;
2293 int amode;
2294 };
2295 #endif
2296 int
sys_eaccess(struct thread * td,struct eaccess_args * uap)2297 sys_eaccess(struct thread *td, struct eaccess_args *uap)
2298 {
2299
2300 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2301 AT_EACCESS, uap->amode));
2302 }
2303
2304 #if defined(COMPAT_43)
2305 /*
2306 * Get file status; this version follows links.
2307 */
2308 #ifndef _SYS_SYSPROTO_H_
2309 struct ostat_args {
2310 char *path;
2311 struct ostat *ub;
2312 };
2313 #endif
2314 int
ostat(struct thread * td,struct ostat_args * uap)2315 ostat(struct thread *td, struct ostat_args *uap)
2316 {
2317 struct stat sb;
2318 struct ostat osb;
2319 int error;
2320
2321 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb);
2322 if (error != 0)
2323 return (error);
2324 cvtstat(&sb, &osb);
2325 return (copyout(&osb, uap->ub, sizeof (osb)));
2326 }
2327
2328 /*
2329 * Get file status; this version does not follow links.
2330 */
2331 #ifndef _SYS_SYSPROTO_H_
2332 struct olstat_args {
2333 char *path;
2334 struct ostat *ub;
2335 };
2336 #endif
2337 int
olstat(struct thread * td,struct olstat_args * uap)2338 olstat(struct thread *td, struct olstat_args *uap)
2339 {
2340 struct stat sb;
2341 struct ostat osb;
2342 int error;
2343
2344 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2345 UIO_USERSPACE, &sb);
2346 if (error != 0)
2347 return (error);
2348 cvtstat(&sb, &osb);
2349 return (copyout(&osb, uap->ub, sizeof (osb)));
2350 }
2351
2352 /*
2353 * Convert from an old to a new stat structure.
2354 * XXX: many values are blindly truncated.
2355 */
2356 void
cvtstat(struct stat * st,struct ostat * ost)2357 cvtstat(struct stat *st, struct ostat *ost)
2358 {
2359
2360 bzero(ost, sizeof(*ost));
2361 ost->st_dev = st->st_dev;
2362 ost->st_ino = st->st_ino;
2363 ost->st_mode = st->st_mode;
2364 ost->st_nlink = st->st_nlink;
2365 ost->st_uid = st->st_uid;
2366 ost->st_gid = st->st_gid;
2367 ost->st_rdev = st->st_rdev;
2368 ost->st_size = MIN(st->st_size, INT32_MAX);
2369 ost->st_atim = st->st_atim;
2370 ost->st_mtim = st->st_mtim;
2371 ost->st_ctim = st->st_ctim;
2372 ost->st_blksize = st->st_blksize;
2373 ost->st_blocks = st->st_blocks;
2374 ost->st_flags = st->st_flags;
2375 ost->st_gen = st->st_gen;
2376 }
2377 #endif /* COMPAT_43 */
2378
2379 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
2380 int ino64_trunc_error;
2381 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW,
2382 &ino64_trunc_error, 0,
2383 "Error on truncation of device, file or inode number, or link count");
2384
2385 int
freebsd11_cvtstat(struct stat * st,struct freebsd11_stat * ost)2386 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost)
2387 {
2388
2389 ost->st_dev = st->st_dev;
2390 if (ost->st_dev != st->st_dev) {
2391 switch (ino64_trunc_error) {
2392 default:
2393 /*
2394 * Since dev_t is almost raw, don't clamp to the
2395 * maximum for case 2, but ignore the error.
2396 */
2397 break;
2398 case 1:
2399 return (EOVERFLOW);
2400 }
2401 }
2402 ost->st_ino = st->st_ino;
2403 if (ost->st_ino != st->st_ino) {
2404 switch (ino64_trunc_error) {
2405 default:
2406 case 0:
2407 break;
2408 case 1:
2409 return (EOVERFLOW);
2410 case 2:
2411 ost->st_ino = UINT32_MAX;
2412 break;
2413 }
2414 }
2415 ost->st_mode = st->st_mode;
2416 ost->st_nlink = st->st_nlink;
2417 if (ost->st_nlink != st->st_nlink) {
2418 switch (ino64_trunc_error) {
2419 default:
2420 case 0:
2421 break;
2422 case 1:
2423 return (EOVERFLOW);
2424 case 2:
2425 ost->st_nlink = UINT16_MAX;
2426 break;
2427 }
2428 }
2429 ost->st_uid = st->st_uid;
2430 ost->st_gid = st->st_gid;
2431 ost->st_rdev = st->st_rdev;
2432 if (ost->st_rdev != st->st_rdev) {
2433 switch (ino64_trunc_error) {
2434 default:
2435 break;
2436 case 1:
2437 return (EOVERFLOW);
2438 }
2439 }
2440 ost->st_atim = st->st_atim;
2441 ost->st_mtim = st->st_mtim;
2442 ost->st_ctim = st->st_ctim;
2443 ost->st_size = st->st_size;
2444 ost->st_blocks = st->st_blocks;
2445 ost->st_blksize = st->st_blksize;
2446 ost->st_flags = st->st_flags;
2447 ost->st_gen = st->st_gen;
2448 ost->st_lspare = 0;
2449 ost->st_birthtim = st->st_birthtim;
2450 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim),
2451 sizeof(*ost) - offsetof(struct freebsd11_stat,
2452 st_birthtim) - sizeof(ost->st_birthtim));
2453 return (0);
2454 }
2455
2456 int
freebsd11_stat(struct thread * td,struct freebsd11_stat_args * uap)2457 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap)
2458 {
2459 struct stat sb;
2460 struct freebsd11_stat osb;
2461 int error;
2462
2463 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb);
2464 if (error != 0)
2465 return (error);
2466 error = freebsd11_cvtstat(&sb, &osb);
2467 if (error == 0)
2468 error = copyout(&osb, uap->ub, sizeof(osb));
2469 return (error);
2470 }
2471
2472 int
freebsd11_lstat(struct thread * td,struct freebsd11_lstat_args * uap)2473 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap)
2474 {
2475 struct stat sb;
2476 struct freebsd11_stat osb;
2477 int error;
2478
2479 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2480 UIO_USERSPACE, &sb);
2481 if (error != 0)
2482 return (error);
2483 error = freebsd11_cvtstat(&sb, &osb);
2484 if (error == 0)
2485 error = copyout(&osb, uap->ub, sizeof(osb));
2486 return (error);
2487 }
2488
2489 int
freebsd11_fhstat(struct thread * td,struct freebsd11_fhstat_args * uap)2490 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap)
2491 {
2492 struct fhandle fh;
2493 struct stat sb;
2494 struct freebsd11_stat osb;
2495 int error;
2496
2497 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
2498 if (error != 0)
2499 return (error);
2500 error = kern_fhstat(td, fh, &sb);
2501 if (error != 0)
2502 return (error);
2503 error = freebsd11_cvtstat(&sb, &osb);
2504 if (error == 0)
2505 error = copyout(&osb, uap->sb, sizeof(osb));
2506 return (error);
2507 }
2508
2509 int
freebsd11_fstatat(struct thread * td,struct freebsd11_fstatat_args * uap)2510 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap)
2511 {
2512 struct stat sb;
2513 struct freebsd11_stat osb;
2514 int error;
2515
2516 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2517 UIO_USERSPACE, &sb);
2518 if (error != 0)
2519 return (error);
2520 error = freebsd11_cvtstat(&sb, &osb);
2521 if (error == 0)
2522 error = copyout(&osb, uap->buf, sizeof(osb));
2523 return (error);
2524 }
2525 #endif /* COMPAT_FREEBSD11 */
2526
2527 /*
2528 * Get file status
2529 */
2530 #ifndef _SYS_SYSPROTO_H_
2531 struct fstatat_args {
2532 int fd;
2533 char *path;
2534 struct stat *buf;
2535 int flag;
2536 }
2537 #endif
2538 int
sys_fstatat(struct thread * td,struct fstatat_args * uap)2539 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2540 {
2541 struct stat sb;
2542 int error;
2543
2544 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2545 UIO_USERSPACE, &sb);
2546 if (error == 0)
2547 error = copyout(&sb, uap->buf, sizeof (sb));
2548 return (error);
2549 }
2550
2551 int
kern_statat(struct thread * td,int flag,int fd,const char * path,enum uio_seg pathseg,struct stat * sbp)2552 kern_statat(struct thread *td, int flag, int fd, const char *path,
2553 enum uio_seg pathseg, struct stat *sbp)
2554 {
2555 struct nameidata nd;
2556 int error;
2557
2558 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2559 AT_EMPTY_PATH)) != 0)
2560 return (EINVAL);
2561
2562 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH |
2563 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF |
2564 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights);
2565
2566 if ((error = namei(&nd)) != 0) {
2567 if (error == ENOTDIR &&
2568 (nd.ni_resflags & NIRES_EMPTYPATH) != 0)
2569 error = kern_fstat(td, fd, sbp);
2570 return (error);
2571 }
2572 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED);
2573 NDFREE_PNBUF(&nd);
2574 vput(nd.ni_vp);
2575 #ifdef __STAT_TIME_T_EXT
2576 sbp->st_atim_ext = 0;
2577 sbp->st_mtim_ext = 0;
2578 sbp->st_ctim_ext = 0;
2579 sbp->st_btim_ext = 0;
2580 #endif
2581 #ifdef KTRACE
2582 if (KTRPOINT(td, KTR_STRUCT))
2583 ktrstat_error(sbp, error);
2584 #endif
2585 return (error);
2586 }
2587
2588 #if defined(COMPAT_FREEBSD11)
2589 /*
2590 * Implementation of the NetBSD [l]stat() functions.
2591 */
2592 int
freebsd11_cvtnstat(struct stat * sb,struct nstat * nsb)2593 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb)
2594 {
2595 struct freebsd11_stat sb11;
2596 int error;
2597
2598 error = freebsd11_cvtstat(sb, &sb11);
2599 if (error != 0)
2600 return (error);
2601
2602 bzero(nsb, sizeof(*nsb));
2603 CP(sb11, *nsb, st_dev);
2604 CP(sb11, *nsb, st_ino);
2605 CP(sb11, *nsb, st_mode);
2606 CP(sb11, *nsb, st_nlink);
2607 CP(sb11, *nsb, st_uid);
2608 CP(sb11, *nsb, st_gid);
2609 CP(sb11, *nsb, st_rdev);
2610 CP(sb11, *nsb, st_atim);
2611 CP(sb11, *nsb, st_mtim);
2612 CP(sb11, *nsb, st_ctim);
2613 CP(sb11, *nsb, st_size);
2614 CP(sb11, *nsb, st_blocks);
2615 CP(sb11, *nsb, st_blksize);
2616 CP(sb11, *nsb, st_flags);
2617 CP(sb11, *nsb, st_gen);
2618 CP(sb11, *nsb, st_birthtim);
2619 return (0);
2620 }
2621
2622 #ifndef _SYS_SYSPROTO_H_
2623 struct freebsd11_nstat_args {
2624 char *path;
2625 struct nstat *ub;
2626 };
2627 #endif
2628 int
freebsd11_nstat(struct thread * td,struct freebsd11_nstat_args * uap)2629 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap)
2630 {
2631 struct stat sb;
2632 struct nstat nsb;
2633 int error;
2634
2635 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, &sb);
2636 if (error != 0)
2637 return (error);
2638 error = freebsd11_cvtnstat(&sb, &nsb);
2639 if (error == 0)
2640 error = copyout(&nsb, uap->ub, sizeof (nsb));
2641 return (error);
2642 }
2643
2644 /*
2645 * NetBSD lstat. Get file status; this version does not follow links.
2646 */
2647 #ifndef _SYS_SYSPROTO_H_
2648 struct freebsd11_nlstat_args {
2649 char *path;
2650 struct nstat *ub;
2651 };
2652 #endif
2653 int
freebsd11_nlstat(struct thread * td,struct freebsd11_nlstat_args * uap)2654 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap)
2655 {
2656 struct stat sb;
2657 struct nstat nsb;
2658 int error;
2659
2660 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2661 UIO_USERSPACE, &sb);
2662 if (error != 0)
2663 return (error);
2664 error = freebsd11_cvtnstat(&sb, &nsb);
2665 if (error == 0)
2666 error = copyout(&nsb, uap->ub, sizeof (nsb));
2667 return (error);
2668 }
2669 #endif /* COMPAT_FREEBSD11 */
2670
2671 /*
2672 * Get configurable pathname variables.
2673 */
2674 #ifndef _SYS_SYSPROTO_H_
2675 struct pathconf_args {
2676 char *path;
2677 int name;
2678 };
2679 #endif
2680 int
sys_pathconf(struct thread * td,struct pathconf_args * uap)2681 sys_pathconf(struct thread *td, struct pathconf_args *uap)
2682 {
2683 long value;
2684 int error;
2685
2686 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW,
2687 &value);
2688 if (error == 0)
2689 td->td_retval[0] = value;
2690 return (error);
2691 }
2692
2693 #ifndef _SYS_SYSPROTO_H_
2694 struct lpathconf_args {
2695 char *path;
2696 int name;
2697 };
2698 #endif
2699 int
sys_lpathconf(struct thread * td,struct lpathconf_args * uap)2700 sys_lpathconf(struct thread *td, struct lpathconf_args *uap)
2701 {
2702 long value;
2703 int error;
2704
2705 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2706 NOFOLLOW, &value);
2707 if (error == 0)
2708 td->td_retval[0] = value;
2709 return (error);
2710 }
2711
2712 int
kern_pathconf(struct thread * td,const char * path,enum uio_seg pathseg,int name,u_long flags,long * valuep)2713 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg,
2714 int name, u_long flags, long *valuep)
2715 {
2716 struct nameidata nd;
2717 int error;
2718
2719 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2720 pathseg, path);
2721 if ((error = namei(&nd)) != 0)
2722 return (error);
2723 NDFREE_PNBUF(&nd);
2724
2725 error = VOP_PATHCONF(nd.ni_vp, name, valuep);
2726 vput(nd.ni_vp);
2727 return (error);
2728 }
2729
2730 /*
2731 * Return target name of a symbolic link.
2732 */
2733 #ifndef _SYS_SYSPROTO_H_
2734 struct readlink_args {
2735 char *path;
2736 char *buf;
2737 size_t count;
2738 };
2739 #endif
2740 int
sys_readlink(struct thread * td,struct readlink_args * uap)2741 sys_readlink(struct thread *td, struct readlink_args *uap)
2742 {
2743
2744 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2745 uap->buf, UIO_USERSPACE, uap->count));
2746 }
2747 #ifndef _SYS_SYSPROTO_H_
2748 struct readlinkat_args {
2749 int fd;
2750 char *path;
2751 char *buf;
2752 size_t bufsize;
2753 };
2754 #endif
2755 int
sys_readlinkat(struct thread * td,struct readlinkat_args * uap)2756 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2757 {
2758
2759 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2760 uap->buf, UIO_USERSPACE, uap->bufsize));
2761 }
2762
2763 int
kern_readlinkat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2764 kern_readlinkat(struct thread *td, int fd, const char *path,
2765 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count)
2766 {
2767 struct vnode *vp;
2768 struct nameidata nd;
2769 int error;
2770
2771 if (count > IOSIZE_MAX)
2772 return (EINVAL);
2773
2774 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 |
2775 EMPTYPATH, pathseg, path, fd);
2776
2777 if ((error = namei(&nd)) != 0)
2778 return (error);
2779 NDFREE_PNBUF(&nd);
2780 vp = nd.ni_vp;
2781
2782 error = kern_readlink_vp(vp, buf, bufseg, count, td);
2783 vput(vp);
2784
2785 return (error);
2786 }
2787
2788 /*
2789 * Helper function to readlink from a vnode
2790 */
2791 static int
kern_readlink_vp(struct vnode * vp,char * buf,enum uio_seg bufseg,size_t count,struct thread * td)2792 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count,
2793 struct thread *td)
2794 {
2795 struct iovec aiov;
2796 struct uio auio;
2797 int error;
2798
2799 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked");
2800 #ifdef MAC
2801 error = mac_vnode_check_readlink(td->td_ucred, vp);
2802 if (error != 0)
2803 return (error);
2804 #endif
2805 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0)
2806 return (EINVAL);
2807
2808 aiov.iov_base = buf;
2809 aiov.iov_len = count;
2810 auio.uio_iov = &aiov;
2811 auio.uio_iovcnt = 1;
2812 auio.uio_offset = 0;
2813 auio.uio_rw = UIO_READ;
2814 auio.uio_segflg = bufseg;
2815 auio.uio_td = td;
2816 auio.uio_resid = count;
2817 error = VOP_READLINK(vp, &auio, td->td_ucred);
2818 td->td_retval[0] = count - auio.uio_resid;
2819 return (error);
2820 }
2821
2822 /*
2823 * Common implementation code for chflags() and fchflags().
2824 */
2825 static int
setfflags(struct thread * td,struct vnode * vp,u_long flags)2826 setfflags(struct thread *td, struct vnode *vp, u_long flags)
2827 {
2828 struct mount *mp;
2829 struct vattr vattr;
2830 int error;
2831
2832 /* We can't support the value matching VNOVAL. */
2833 if (flags == VNOVAL)
2834 return (EOPNOTSUPP);
2835
2836 /*
2837 * Prevent non-root users from setting flags on devices. When
2838 * a device is reused, users can retain ownership of the device
2839 * if they are allowed to set flags and programs assume that
2840 * chown can't fail when done as root.
2841 */
2842 if (VN_ISDEV(vp)) {
2843 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2844 if (error != 0)
2845 return (error);
2846 }
2847
2848 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2849 return (error);
2850 VATTR_NULL(&vattr);
2851 vattr.va_flags = flags;
2852 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2853 #ifdef MAC
2854 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2855 if (error == 0)
2856 #endif
2857 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2858 VOP_UNLOCK(vp);
2859 vn_finished_write(mp);
2860 return (error);
2861 }
2862
2863 /*
2864 * Change flags of a file given a path name.
2865 */
2866 #ifndef _SYS_SYSPROTO_H_
2867 struct chflags_args {
2868 const char *path;
2869 u_long flags;
2870 };
2871 #endif
2872 int
sys_chflags(struct thread * td,struct chflags_args * uap)2873 sys_chflags(struct thread *td, struct chflags_args *uap)
2874 {
2875
2876 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2877 uap->flags, 0));
2878 }
2879
2880 #ifndef _SYS_SYSPROTO_H_
2881 struct chflagsat_args {
2882 int fd;
2883 const char *path;
2884 u_long flags;
2885 int atflag;
2886 }
2887 #endif
2888 int
sys_chflagsat(struct thread * td,struct chflagsat_args * uap)2889 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2890 {
2891
2892 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE,
2893 uap->flags, uap->atflag));
2894 }
2895
2896 /*
2897 * Same as chflags() but doesn't follow symlinks.
2898 */
2899 #ifndef _SYS_SYSPROTO_H_
2900 struct lchflags_args {
2901 const char *path;
2902 u_long flags;
2903 };
2904 #endif
2905 int
sys_lchflags(struct thread * td,struct lchflags_args * uap)2906 sys_lchflags(struct thread *td, struct lchflags_args *uap)
2907 {
2908
2909 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2910 uap->flags, AT_SYMLINK_NOFOLLOW));
2911 }
2912
2913 static int
kern_chflagsat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,u_long flags,int atflag)2914 kern_chflagsat(struct thread *td, int fd, const char *path,
2915 enum uio_seg pathseg, u_long flags, int atflag)
2916 {
2917 struct nameidata nd;
2918 int error;
2919
2920 if ((atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2921 AT_EMPTY_PATH)) != 0)
2922 return (EINVAL);
2923
2924 AUDIT_ARG_FFLAGS(flags);
2925 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW |
2926 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
2927 fd, &cap_fchflags_rights);
2928 if ((error = namei(&nd)) != 0)
2929 return (error);
2930 NDFREE_PNBUF(&nd);
2931 error = setfflags(td, nd.ni_vp, flags);
2932 vrele(nd.ni_vp);
2933 return (error);
2934 }
2935
2936 /*
2937 * Change flags of a file given a file descriptor.
2938 */
2939 #ifndef _SYS_SYSPROTO_H_
2940 struct fchflags_args {
2941 int fd;
2942 u_long flags;
2943 };
2944 #endif
2945 int
sys_fchflags(struct thread * td,struct fchflags_args * uap)2946 sys_fchflags(struct thread *td, struct fchflags_args *uap)
2947 {
2948 struct file *fp;
2949 int error;
2950
2951 AUDIT_ARG_FD(uap->fd);
2952 AUDIT_ARG_FFLAGS(uap->flags);
2953 error = getvnode(td, uap->fd, &cap_fchflags_rights,
2954 &fp);
2955 if (error != 0)
2956 return (error);
2957 #ifdef AUDIT
2958 if (AUDITING_TD(td)) {
2959 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2960 AUDIT_ARG_VNODE1(fp->f_vnode);
2961 VOP_UNLOCK(fp->f_vnode);
2962 }
2963 #endif
2964 error = setfflags(td, fp->f_vnode, uap->flags);
2965 fdrop(fp, td);
2966 return (error);
2967 }
2968
2969 /*
2970 * Common implementation code for chmod(), lchmod() and fchmod().
2971 */
2972 int
setfmode(struct thread * td,struct ucred * cred,struct vnode * vp,int mode)2973 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode)
2974 {
2975 struct mount *mp;
2976 struct vattr vattr;
2977 int error;
2978
2979 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
2980 return (error);
2981 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2982 VATTR_NULL(&vattr);
2983 vattr.va_mode = mode & ALLPERMS;
2984 #ifdef MAC
2985 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2986 if (error == 0)
2987 #endif
2988 error = VOP_SETATTR(vp, &vattr, cred);
2989 VOP_UNLOCK(vp);
2990 vn_finished_write(mp);
2991 return (error);
2992 }
2993
2994 /*
2995 * Change mode of a file given path name.
2996 */
2997 #ifndef _SYS_SYSPROTO_H_
2998 struct chmod_args {
2999 char *path;
3000 int mode;
3001 };
3002 #endif
3003 int
sys_chmod(struct thread * td,struct chmod_args * uap)3004 sys_chmod(struct thread *td, struct chmod_args *uap)
3005 {
3006
3007 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3008 uap->mode, 0));
3009 }
3010
3011 #ifndef _SYS_SYSPROTO_H_
3012 struct fchmodat_args {
3013 int dirfd;
3014 char *path;
3015 mode_t mode;
3016 int flag;
3017 }
3018 #endif
3019 int
sys_fchmodat(struct thread * td,struct fchmodat_args * uap)3020 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
3021 {
3022
3023 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE,
3024 uap->mode, uap->flag));
3025 }
3026
3027 /*
3028 * Change mode of a file given path name (don't follow links.)
3029 */
3030 #ifndef _SYS_SYSPROTO_H_
3031 struct lchmod_args {
3032 char *path;
3033 int mode;
3034 };
3035 #endif
3036 int
sys_lchmod(struct thread * td,struct lchmod_args * uap)3037 sys_lchmod(struct thread *td, struct lchmod_args *uap)
3038 {
3039
3040 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3041 uap->mode, AT_SYMLINK_NOFOLLOW));
3042 }
3043
3044 int
kern_fchmodat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,mode_t mode,int flag)3045 kern_fchmodat(struct thread *td, int fd, const char *path,
3046 enum uio_seg pathseg, mode_t mode, int flag)
3047 {
3048 struct nameidata nd;
3049 int error;
3050
3051 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3052 AT_EMPTY_PATH)) != 0)
3053 return (EINVAL);
3054
3055 AUDIT_ARG_MODE(mode);
3056 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3057 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
3058 fd, &cap_fchmod_rights);
3059 if ((error = namei(&nd)) != 0)
3060 return (error);
3061 NDFREE_PNBUF(&nd);
3062 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
3063 vrele(nd.ni_vp);
3064 return (error);
3065 }
3066
3067 /*
3068 * Change mode of a file given a file descriptor.
3069 */
3070 #ifndef _SYS_SYSPROTO_H_
3071 struct fchmod_args {
3072 int fd;
3073 int mode;
3074 };
3075 #endif
3076 int
sys_fchmod(struct thread * td,struct fchmod_args * uap)3077 sys_fchmod(struct thread *td, struct fchmod_args *uap)
3078 {
3079 struct file *fp;
3080 int error;
3081
3082 AUDIT_ARG_FD(uap->fd);
3083 AUDIT_ARG_MODE(uap->mode);
3084
3085 error = fget(td, uap->fd, &cap_fchmod_rights, &fp);
3086 if (error != 0)
3087 return (error);
3088 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
3089 fdrop(fp, td);
3090 return (error);
3091 }
3092
3093 /*
3094 * Common implementation for chown(), lchown(), and fchown()
3095 */
3096 int
setfown(struct thread * td,struct ucred * cred,struct vnode * vp,uid_t uid,gid_t gid)3097 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
3098 gid_t gid)
3099 {
3100 struct mount *mp;
3101 struct vattr vattr;
3102 int error;
3103
3104 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
3105 return (error);
3106 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3107 VATTR_NULL(&vattr);
3108 vattr.va_uid = uid;
3109 vattr.va_gid = gid;
3110 #ifdef MAC
3111 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
3112 vattr.va_gid);
3113 if (error == 0)
3114 #endif
3115 error = VOP_SETATTR(vp, &vattr, cred);
3116 VOP_UNLOCK(vp);
3117 vn_finished_write(mp);
3118 return (error);
3119 }
3120
3121 /*
3122 * Set ownership given a path name.
3123 */
3124 #ifndef _SYS_SYSPROTO_H_
3125 struct chown_args {
3126 char *path;
3127 int uid;
3128 int gid;
3129 };
3130 #endif
3131 int
sys_chown(struct thread * td,struct chown_args * uap)3132 sys_chown(struct thread *td, struct chown_args *uap)
3133 {
3134
3135 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid,
3136 uap->gid, 0));
3137 }
3138
3139 #ifndef _SYS_SYSPROTO_H_
3140 struct fchownat_args {
3141 int fd;
3142 const char * path;
3143 uid_t uid;
3144 gid_t gid;
3145 int flag;
3146 };
3147 #endif
3148 int
sys_fchownat(struct thread * td,struct fchownat_args * uap)3149 sys_fchownat(struct thread *td, struct fchownat_args *uap)
3150 {
3151
3152 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
3153 uap->gid, uap->flag));
3154 }
3155
3156 int
kern_fchownat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,int uid,int gid,int flag)3157 kern_fchownat(struct thread *td, int fd, const char *path,
3158 enum uio_seg pathseg, int uid, int gid, int flag)
3159 {
3160 struct nameidata nd;
3161 int error;
3162
3163 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3164 AT_EMPTY_PATH)) != 0)
3165 return (EINVAL);
3166
3167 AUDIT_ARG_OWNER(uid, gid);
3168 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3169 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
3170 fd, &cap_fchown_rights);
3171
3172 if ((error = namei(&nd)) != 0)
3173 return (error);
3174 NDFREE_PNBUF(&nd);
3175 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
3176 vrele(nd.ni_vp);
3177 return (error);
3178 }
3179
3180 /*
3181 * Set ownership given a path name, do not cross symlinks.
3182 */
3183 #ifndef _SYS_SYSPROTO_H_
3184 struct lchown_args {
3185 char *path;
3186 int uid;
3187 int gid;
3188 };
3189 #endif
3190 int
sys_lchown(struct thread * td,struct lchown_args * uap)3191 sys_lchown(struct thread *td, struct lchown_args *uap)
3192 {
3193
3194 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3195 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
3196 }
3197
3198 /*
3199 * Set ownership given a file descriptor.
3200 */
3201 #ifndef _SYS_SYSPROTO_H_
3202 struct fchown_args {
3203 int fd;
3204 int uid;
3205 int gid;
3206 };
3207 #endif
3208 int
sys_fchown(struct thread * td,struct fchown_args * uap)3209 sys_fchown(struct thread *td, struct fchown_args *uap)
3210 {
3211 struct file *fp;
3212 int error;
3213
3214 AUDIT_ARG_FD(uap->fd);
3215 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3216 error = fget(td, uap->fd, &cap_fchown_rights, &fp);
3217 if (error != 0)
3218 return (error);
3219 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3220 fdrop(fp, td);
3221 return (error);
3222 }
3223
3224 /*
3225 * Common implementation code for utimes(), lutimes(), and futimes().
3226 */
3227 static int
getutimes(const struct timeval * usrtvp,enum uio_seg tvpseg,struct timespec * tsp)3228 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg,
3229 struct timespec *tsp)
3230 {
3231 struct timeval tv[2];
3232 const struct timeval *tvp;
3233 int error;
3234
3235 if (usrtvp == NULL) {
3236 vfs_timestamp(&tsp[0]);
3237 tsp[1] = tsp[0];
3238 } else {
3239 if (tvpseg == UIO_SYSSPACE) {
3240 tvp = usrtvp;
3241 } else {
3242 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3243 return (error);
3244 tvp = tv;
3245 }
3246
3247 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3248 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3249 return (EINVAL);
3250 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3251 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3252 }
3253 return (0);
3254 }
3255
3256 /*
3257 * Common implementation code for futimens(), utimensat().
3258 */
3259 #define UTIMENS_NULL 0x1
3260 #define UTIMENS_EXIT 0x2
3261 static int
getutimens(const struct timespec * usrtsp,enum uio_seg tspseg,struct timespec * tsp,int * retflags)3262 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
3263 struct timespec *tsp, int *retflags)
3264 {
3265 struct timespec tsnow;
3266 int error;
3267
3268 vfs_timestamp(&tsnow);
3269 *retflags = 0;
3270 if (usrtsp == NULL) {
3271 tsp[0] = tsnow;
3272 tsp[1] = tsnow;
3273 *retflags |= UTIMENS_NULL;
3274 return (0);
3275 }
3276 if (tspseg == UIO_SYSSPACE) {
3277 tsp[0] = usrtsp[0];
3278 tsp[1] = usrtsp[1];
3279 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
3280 return (error);
3281 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
3282 *retflags |= UTIMENS_EXIT;
3283 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
3284 *retflags |= UTIMENS_NULL;
3285 if (tsp[0].tv_nsec == UTIME_OMIT)
3286 tsp[0].tv_sec = VNOVAL;
3287 else if (tsp[0].tv_nsec == UTIME_NOW)
3288 tsp[0] = tsnow;
3289 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
3290 return (EINVAL);
3291 if (tsp[1].tv_nsec == UTIME_OMIT)
3292 tsp[1].tv_sec = VNOVAL;
3293 else if (tsp[1].tv_nsec == UTIME_NOW)
3294 tsp[1] = tsnow;
3295 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
3296 return (EINVAL);
3297
3298 return (0);
3299 }
3300
3301 /*
3302 * Common implementation code for utimes(), lutimes(), futimes(), futimens(),
3303 * and utimensat().
3304 */
3305 static int
setutimes(struct thread * td,struct vnode * vp,const struct timespec * ts,int numtimes,int nullflag)3306 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts,
3307 int numtimes, int nullflag)
3308 {
3309 struct mount *mp;
3310 struct vattr vattr;
3311 int error;
3312 bool setbirthtime;
3313
3314 setbirthtime = false;
3315 vattr.va_birthtime.tv_sec = VNOVAL;
3316 vattr.va_birthtime.tv_nsec = 0;
3317
3318 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0)
3319 return (error);
3320 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3321 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred) == 0 &&
3322 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3323 setbirthtime = true;
3324 VATTR_NULL(&vattr);
3325 vattr.va_atime = ts[0];
3326 vattr.va_mtime = ts[1];
3327 if (setbirthtime)
3328 vattr.va_birthtime = ts[1];
3329 if (numtimes > 2)
3330 vattr.va_birthtime = ts[2];
3331 if (nullflag)
3332 vattr.va_vaflags |= VA_UTIMES_NULL;
3333 #ifdef MAC
3334 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3335 vattr.va_mtime);
3336 #endif
3337 if (error == 0)
3338 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3339 VOP_UNLOCK(vp);
3340 vn_finished_write(mp);
3341 return (error);
3342 }
3343
3344 /*
3345 * Set the access and modification times of a file.
3346 */
3347 #ifndef _SYS_SYSPROTO_H_
3348 struct utimes_args {
3349 char *path;
3350 struct timeval *tptr;
3351 };
3352 #endif
3353 int
sys_utimes(struct thread * td,struct utimes_args * uap)3354 sys_utimes(struct thread *td, struct utimes_args *uap)
3355 {
3356
3357 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3358 uap->tptr, UIO_USERSPACE));
3359 }
3360
3361 #ifndef _SYS_SYSPROTO_H_
3362 struct futimesat_args {
3363 int fd;
3364 const char * path;
3365 const struct timeval * times;
3366 };
3367 #endif
3368 int
sys_futimesat(struct thread * td,struct futimesat_args * uap)3369 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3370 {
3371
3372 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3373 uap->times, UIO_USERSPACE));
3374 }
3375
3376 int
kern_utimesat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,const struct timeval * tptr,enum uio_seg tptrseg)3377 kern_utimesat(struct thread *td, int fd, const char *path,
3378 enum uio_seg pathseg, const struct timeval *tptr, enum uio_seg tptrseg)
3379 {
3380 struct nameidata nd;
3381 struct timespec ts[2];
3382 int error;
3383
3384 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3385 return (error);
3386 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3387 &cap_futimes_rights);
3388
3389 if ((error = namei(&nd)) != 0)
3390 return (error);
3391 NDFREE_PNBUF(&nd);
3392 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3393 vrele(nd.ni_vp);
3394 return (error);
3395 }
3396
3397 /*
3398 * Set the access and modification times of a file.
3399 */
3400 #ifndef _SYS_SYSPROTO_H_
3401 struct lutimes_args {
3402 char *path;
3403 struct timeval *tptr;
3404 };
3405 #endif
3406 int
sys_lutimes(struct thread * td,struct lutimes_args * uap)3407 sys_lutimes(struct thread *td, struct lutimes_args *uap)
3408 {
3409
3410 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3411 UIO_USERSPACE));
3412 }
3413
3414 int
kern_lutimes(struct thread * td,const char * path,enum uio_seg pathseg,const struct timeval * tptr,enum uio_seg tptrseg)3415 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg,
3416 const struct timeval *tptr, enum uio_seg tptrseg)
3417 {
3418 struct timespec ts[2];
3419 struct nameidata nd;
3420 int error;
3421
3422 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3423 return (error);
3424 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path);
3425 if ((error = namei(&nd)) != 0)
3426 return (error);
3427 NDFREE_PNBUF(&nd);
3428 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3429 vrele(nd.ni_vp);
3430 return (error);
3431 }
3432
3433 /*
3434 * Set the access and modification times of a file.
3435 */
3436 #ifndef _SYS_SYSPROTO_H_
3437 struct futimes_args {
3438 int fd;
3439 struct timeval *tptr;
3440 };
3441 #endif
3442 int
sys_futimes(struct thread * td,struct futimes_args * uap)3443 sys_futimes(struct thread *td, struct futimes_args *uap)
3444 {
3445
3446 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3447 }
3448
3449 int
kern_futimes(struct thread * td,int fd,const struct timeval * tptr,enum uio_seg tptrseg)3450 kern_futimes(struct thread *td, int fd, const struct timeval *tptr,
3451 enum uio_seg tptrseg)
3452 {
3453 struct timespec ts[2];
3454 struct file *fp;
3455 int error;
3456
3457 AUDIT_ARG_FD(fd);
3458 error = getutimes(tptr, tptrseg, ts);
3459 if (error != 0)
3460 return (error);
3461 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3462 if (error != 0)
3463 return (error);
3464 #ifdef AUDIT
3465 if (AUDITING_TD(td)) {
3466 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3467 AUDIT_ARG_VNODE1(fp->f_vnode);
3468 VOP_UNLOCK(fp->f_vnode);
3469 }
3470 #endif
3471 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3472 fdrop(fp, td);
3473 return (error);
3474 }
3475
3476 int
sys_futimens(struct thread * td,struct futimens_args * uap)3477 sys_futimens(struct thread *td, struct futimens_args *uap)
3478 {
3479
3480 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
3481 }
3482
3483 int
kern_futimens(struct thread * td,int fd,const struct timespec * tptr,enum uio_seg tptrseg)3484 kern_futimens(struct thread *td, int fd, const struct timespec *tptr,
3485 enum uio_seg tptrseg)
3486 {
3487 struct timespec ts[2];
3488 struct file *fp;
3489 int error, flags;
3490
3491 AUDIT_ARG_FD(fd);
3492 error = getutimens(tptr, tptrseg, ts, &flags);
3493 if (error != 0)
3494 return (error);
3495 if (flags & UTIMENS_EXIT)
3496 return (0);
3497 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3498 if (error != 0)
3499 return (error);
3500 #ifdef AUDIT
3501 if (AUDITING_TD(td)) {
3502 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3503 AUDIT_ARG_VNODE1(fp->f_vnode);
3504 VOP_UNLOCK(fp->f_vnode);
3505 }
3506 #endif
3507 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
3508 fdrop(fp, td);
3509 return (error);
3510 }
3511
3512 int
sys_utimensat(struct thread * td,struct utimensat_args * uap)3513 sys_utimensat(struct thread *td, struct utimensat_args *uap)
3514 {
3515
3516 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
3517 uap->times, UIO_USERSPACE, uap->flag));
3518 }
3519
3520 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)3521 kern_utimensat(struct thread *td, int fd, const char *path,
3522 enum uio_seg pathseg, const struct timespec *tptr, enum uio_seg tptrseg,
3523 int flag)
3524 {
3525 struct nameidata nd;
3526 struct timespec ts[2];
3527 int error, flags;
3528
3529 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3530 AT_EMPTY_PATH)) != 0)
3531 return (EINVAL);
3532
3533 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
3534 return (error);
3535 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3536 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1,
3537 pathseg, path, fd, &cap_futimes_rights);
3538 if ((error = namei(&nd)) != 0)
3539 return (error);
3540 /*
3541 * We are allowed to call namei() regardless of 2xUTIME_OMIT.
3542 * POSIX states:
3543 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
3544 * "Search permission is denied by a component of the path prefix."
3545 */
3546 NDFREE_PNBUF(&nd);
3547 if ((flags & UTIMENS_EXIT) == 0)
3548 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
3549 vrele(nd.ni_vp);
3550 return (error);
3551 }
3552
3553 /*
3554 * Truncate a file given its path name.
3555 */
3556 #ifndef _SYS_SYSPROTO_H_
3557 struct truncate_args {
3558 char *path;
3559 int pad;
3560 off_t length;
3561 };
3562 #endif
3563 int
sys_truncate(struct thread * td,struct truncate_args * uap)3564 sys_truncate(struct thread *td, struct truncate_args *uap)
3565 {
3566
3567 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3568 }
3569
3570 int
kern_truncate(struct thread * td,const char * path,enum uio_seg pathseg,off_t length)3571 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg,
3572 off_t length)
3573 {
3574 struct mount *mp;
3575 struct vnode *vp;
3576 void *rl_cookie;
3577 struct nameidata nd;
3578 int error;
3579
3580 if (length < 0)
3581 return (EINVAL);
3582 NDPREINIT(&nd);
3583 retry:
3584 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path);
3585 if ((error = namei(&nd)) != 0)
3586 return (error);
3587 vp = nd.ni_vp;
3588 NDFREE_PNBUF(&nd);
3589 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3590 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) {
3591 vn_rangelock_unlock(vp, rl_cookie);
3592 vrele(vp);
3593 return (error);
3594 }
3595 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3596 if (vp->v_type == VDIR) {
3597 error = EISDIR;
3598 goto out;
3599 }
3600 #ifdef MAC
3601 error = mac_vnode_check_write(td->td_ucred, NOCRED, vp);
3602 if (error != 0)
3603 goto out;
3604 #endif
3605 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
3606 if (error != 0)
3607 goto out;
3608
3609 error = vn_truncate_locked(vp, length, false, td->td_ucred);
3610 out:
3611 VOP_UNLOCK(vp);
3612 vn_finished_write(mp);
3613 vn_rangelock_unlock(vp, rl_cookie);
3614 vrele(vp);
3615 if (error == ERELOOKUP)
3616 goto retry;
3617 return (error);
3618 }
3619
3620 #if defined(COMPAT_43)
3621 /*
3622 * Truncate a file given its path name.
3623 */
3624 #ifndef _SYS_SYSPROTO_H_
3625 struct otruncate_args {
3626 char *path;
3627 long length;
3628 };
3629 #endif
3630 int
otruncate(struct thread * td,struct otruncate_args * uap)3631 otruncate(struct thread *td, struct otruncate_args *uap)
3632 {
3633
3634 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3635 }
3636 #endif /* COMPAT_43 */
3637
3638 #if defined(COMPAT_FREEBSD6)
3639 /* Versions with the pad argument */
3640 int
freebsd6_truncate(struct thread * td,struct freebsd6_truncate_args * uap)3641 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3642 {
3643
3644 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3645 }
3646
3647 int
freebsd6_ftruncate(struct thread * td,struct freebsd6_ftruncate_args * uap)3648 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3649 {
3650
3651 return (kern_ftruncate(td, uap->fd, uap->length));
3652 }
3653 #endif
3654
3655 int
kern_fsync(struct thread * td,int fd,bool fullsync)3656 kern_fsync(struct thread *td, int fd, bool fullsync)
3657 {
3658 struct vnode *vp;
3659 struct mount *mp;
3660 struct file *fp;
3661 int error;
3662
3663 AUDIT_ARG_FD(fd);
3664 error = getvnode(td, fd, &cap_fsync_rights, &fp);
3665 if (error != 0)
3666 return (error);
3667 vp = fp->f_vnode;
3668 #if 0
3669 if (!fullsync)
3670 /* XXXKIB: compete outstanding aio writes */;
3671 #endif
3672 retry:
3673 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH);
3674 if (error != 0)
3675 goto drop;
3676 vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY);
3677 AUDIT_ARG_VNODE1(vp);
3678 vnode_pager_clean_async(vp);
3679 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td);
3680 VOP_UNLOCK(vp);
3681 vn_finished_write(mp);
3682 if (error == ERELOOKUP)
3683 goto retry;
3684 drop:
3685 fdrop(fp, td);
3686 return (error);
3687 }
3688
3689 /*
3690 * Sync an open file.
3691 */
3692 #ifndef _SYS_SYSPROTO_H_
3693 struct fsync_args {
3694 int fd;
3695 };
3696 #endif
3697 int
sys_fsync(struct thread * td,struct fsync_args * uap)3698 sys_fsync(struct thread *td, struct fsync_args *uap)
3699 {
3700
3701 return (kern_fsync(td, uap->fd, true));
3702 }
3703
3704 int
sys_fdatasync(struct thread * td,struct fdatasync_args * uap)3705 sys_fdatasync(struct thread *td, struct fdatasync_args *uap)
3706 {
3707
3708 return (kern_fsync(td, uap->fd, false));
3709 }
3710
3711 /*
3712 * Rename files. Source and destination must either both be directories, or
3713 * both not be directories. If target is a directory, it must be empty.
3714 */
3715 #ifndef _SYS_SYSPROTO_H_
3716 struct rename_args {
3717 char *from;
3718 char *to;
3719 };
3720 #endif
3721 int
sys_rename(struct thread * td,struct rename_args * uap)3722 sys_rename(struct thread *td, struct rename_args *uap)
3723 {
3724
3725 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
3726 uap->to, UIO_USERSPACE, 0));
3727 }
3728
3729 #ifndef _SYS_SYSPROTO_H_
3730 struct renameat_args {
3731 int oldfd;
3732 char *old;
3733 int newfd;
3734 char *new;
3735 };
3736 #endif
3737 int
sys_renameat(struct thread * td,struct renameat_args * uap)3738 sys_renameat(struct thread *td, struct renameat_args *uap)
3739 {
3740
3741 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3742 UIO_USERSPACE, 0));
3743 }
3744
3745 int
sys_renameat2(struct thread * td,struct renameat2_args * uap)3746 sys_renameat2(struct thread *td, struct renameat2_args *uap)
3747 {
3748
3749 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3750 UIO_USERSPACE, uap->flags));
3751 }
3752
3753 #ifdef MAC
3754 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)3755 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd,
3756 const char *new, enum uio_seg pathseg, struct nameidata *fromnd)
3757 {
3758 int error;
3759
3760 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3761 pathseg, old, oldfd, &cap_renameat_source_rights);
3762 if ((error = namei(fromnd)) != 0)
3763 return (error);
3764 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp,
3765 fromnd->ni_vp, &fromnd->ni_cnd);
3766 VOP_UNLOCK(fromnd->ni_dvp);
3767 if (fromnd->ni_dvp != fromnd->ni_vp)
3768 VOP_UNLOCK(fromnd->ni_vp);
3769 if (error != 0) {
3770 NDFREE_PNBUF(fromnd);
3771 vrele(fromnd->ni_dvp);
3772 vrele(fromnd->ni_vp);
3773 }
3774 return (error);
3775 }
3776 #endif
3777
3778 int
kern_renameat(struct thread * td,int oldfd,const char * old,int newfd,const char * new,enum uio_seg pathseg,u_int flags)3779 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd,
3780 const char *new, enum uio_seg pathseg, u_int flags)
3781 {
3782 struct mount *mp, *tmp;
3783 struct vnode *tvp, *fvp, *tdvp;
3784 struct nameidata fromnd, tond;
3785 uint64_t tondflags;
3786 int error;
3787 short irflag;
3788
3789 if ((flags & ~(AT_RENAME_NOREPLACE)) != 0)
3790 return (EINVAL);
3791 again:
3792 tmp = mp = NULL;
3793 bwillwrite();
3794 #ifdef MAC
3795 if (mac_vnode_check_rename_from_enabled()) {
3796 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg,
3797 &fromnd);
3798 if (error != 0)
3799 return (error);
3800 } else {
3801 #endif
3802 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | AUDITVNODE1,
3803 pathseg, old, oldfd, &cap_renameat_source_rights);
3804 if ((error = namei(&fromnd)) != 0)
3805 return (error);
3806 #ifdef MAC
3807 }
3808 #endif
3809 fvp = fromnd.ni_vp;
3810 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | AUDITVNODE2;
3811 if (fromnd.ni_vp->v_type == VDIR)
3812 tondflags |= WILLBEDIR;
3813 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd,
3814 &cap_renameat_target_rights);
3815 if ((error = namei(&tond)) != 0) {
3816 /* Translate error code for rename("dir1", "dir2/."). */
3817 if (error == EISDIR && fvp->v_type == VDIR)
3818 error = EINVAL;
3819 NDFREE_PNBUF(&fromnd);
3820 vrele(fromnd.ni_dvp);
3821 vrele(fvp);
3822 goto out1;
3823 }
3824 tdvp = tond.ni_dvp;
3825 tvp = tond.ni_vp;
3826 if (tvp != NULL && (flags & AT_RENAME_NOREPLACE) != 0) {
3827 /*
3828 * Often filesystems need to relock the vnodes in
3829 * VOP_RENAME(), which opens a window for invalidation
3830 * of this check. Then, not all filesystems might
3831 * implement AT_RENAME_NOREPLACE. This leads to
3832 * situation where sometimes EOPNOTSUPP might be
3833 * returned from the VOP due to race, while most of
3834 * the time this check works.
3835 */
3836 error = EEXIST;
3837 goto out;
3838 }
3839 error = vn_start_write(fvp, &mp, V_NOWAIT);
3840 if (error != 0) {
3841 again1:
3842 NDFREE_PNBUF(&fromnd);
3843 NDFREE_PNBUF(&tond);
3844 if (tvp != NULL)
3845 vput(tvp);
3846 if (tdvp == tvp)
3847 vrele(tdvp);
3848 else
3849 vput(tdvp);
3850 vrele(fromnd.ni_dvp);
3851 vrele(fvp);
3852 if (tmp != NULL) {
3853 lockmgr(&tmp->mnt_renamelock, LK_EXCLUSIVE, NULL);
3854 lockmgr(&tmp->mnt_renamelock, LK_RELEASE, NULL);
3855 vfs_rel(tmp);
3856 tmp = NULL;
3857 }
3858 error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH);
3859 if (error != 0)
3860 return (error);
3861 goto again;
3862 }
3863 error = VOP_GETWRITEMOUNT(tdvp, &tmp);
3864 if (error != 0 || tmp == NULL)
3865 goto again1;
3866 error = lockmgr(&tmp->mnt_renamelock, LK_EXCLUSIVE | LK_NOWAIT, NULL);
3867 if (error != 0) {
3868 vn_finished_write(mp);
3869 goto again1;
3870 }
3871 irflag = vn_irflag_read(fvp);
3872 if (((irflag & VIRF_NAMEDATTR) != 0 && tdvp != fromnd.ni_dvp) ||
3873 (irflag & VIRF_NAMEDDIR) != 0) {
3874 error = EINVAL;
3875 goto out;
3876 }
3877 if (tvp != NULL) {
3878 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3879 error = ENOTDIR;
3880 goto out;
3881 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3882 error = EISDIR;
3883 goto out;
3884 }
3885 #ifdef CAPABILITIES
3886 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) {
3887 /*
3888 * If the target already exists we require CAP_UNLINKAT
3889 * from 'newfd', when newfd was used for the lookup.
3890 */
3891 error = cap_check(&tond.ni_filecaps.fc_rights,
3892 &cap_unlinkat_rights);
3893 if (error != 0)
3894 goto out;
3895 }
3896 #endif
3897 }
3898 if (fvp == tdvp) {
3899 error = EINVAL;
3900 goto out;
3901 }
3902 /*
3903 * If the source is the same as the destination (that is, if they
3904 * are links to the same vnode), then there is nothing to do.
3905 */
3906 if (fvp == tvp)
3907 error = ERESTART;
3908 #ifdef MAC
3909 else
3910 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3911 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3912 #endif
3913 out:
3914 if (error == 0) {
3915 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3916 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd, flags);
3917 NDFREE_PNBUF(&fromnd);
3918 NDFREE_PNBUF(&tond);
3919 } else {
3920 NDFREE_PNBUF(&fromnd);
3921 NDFREE_PNBUF(&tond);
3922 if (tvp != NULL)
3923 vput(tvp);
3924 if (tdvp == tvp)
3925 vrele(tdvp);
3926 else
3927 vput(tdvp);
3928 vrele(fromnd.ni_dvp);
3929 vrele(fvp);
3930 }
3931 if (tmp != NULL) {
3932 lockmgr(&tmp->mnt_renamelock, LK_RELEASE, 0);
3933 vfs_rel(tmp);
3934 }
3935 if (mp != NULL)
3936 vn_finished_write(mp);
3937 out1:
3938 if (error == ERESTART)
3939 return (0);
3940 if (error == ERELOOKUP)
3941 goto again;
3942 return (error);
3943 }
3944
3945 /*
3946 * Make a directory file.
3947 */
3948 #ifndef _SYS_SYSPROTO_H_
3949 struct mkdir_args {
3950 char *path;
3951 int mode;
3952 };
3953 #endif
3954 int
sys_mkdir(struct thread * td,struct mkdir_args * uap)3955 sys_mkdir(struct thread *td, struct mkdir_args *uap)
3956 {
3957
3958 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3959 uap->mode));
3960 }
3961
3962 #ifndef _SYS_SYSPROTO_H_
3963 struct mkdirat_args {
3964 int fd;
3965 char *path;
3966 mode_t mode;
3967 };
3968 #endif
3969 int
sys_mkdirat(struct thread * td,struct mkdirat_args * uap)3970 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3971 {
3972
3973 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3974 }
3975
3976 int
kern_mkdirat(struct thread * td,int fd,const char * path,enum uio_seg segflg,int mode)3977 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg,
3978 int mode)
3979 {
3980 struct mount *mp;
3981 struct vattr vattr;
3982 struct nameidata nd;
3983 int error;
3984
3985 AUDIT_ARG_MODE(mode);
3986 NDPREINIT(&nd);
3987 restart:
3988 bwillwrite();
3989 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | AUDITVNODE1 |
3990 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR,
3991 segflg, path, fd, &cap_mkdirat_rights);
3992 if ((error = namei(&nd)) != 0)
3993 return (error);
3994 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3995 NDFREE_PNBUF(&nd);
3996 vput(nd.ni_dvp);
3997 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
3998 return (error);
3999 goto restart;
4000 }
4001 if ((vn_irflag_read(nd.ni_dvp) & VIRF_NAMEDDIR) != 0) {
4002 error = EINVAL;
4003 goto out;
4004 }
4005 VATTR_NULL(&vattr);
4006 vattr.va_type = VDIR;
4007 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask;
4008 #ifdef MAC
4009 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
4010 &vattr);
4011 if (error != 0)
4012 goto out;
4013 #endif
4014 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
4015 out:
4016 NDFREE_PNBUF(&nd);
4017 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
4018 vn_finished_write(mp);
4019 if (error == ERELOOKUP)
4020 goto restart;
4021 return (error);
4022 }
4023
4024 /*
4025 * Remove a directory file.
4026 */
4027 #ifndef _SYS_SYSPROTO_H_
4028 struct rmdir_args {
4029 char *path;
4030 };
4031 #endif
4032 int
sys_rmdir(struct thread * td,struct rmdir_args * uap)4033 sys_rmdir(struct thread *td, struct rmdir_args *uap)
4034 {
4035
4036 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
4037 0));
4038 }
4039
4040 int
kern_frmdirat(struct thread * td,int dfd,const char * path,int fd,enum uio_seg pathseg,int flag)4041 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd,
4042 enum uio_seg pathseg, int flag)
4043 {
4044 struct mount *mp;
4045 struct vnode *vp;
4046 struct file *fp;
4047 struct nameidata nd;
4048 cap_rights_t rights;
4049 int error;
4050
4051 fp = NULL;
4052 if (fd != FD_NONE) {
4053 error = getvnode(td, fd, cap_rights_init_one(&rights,
4054 CAP_LOOKUP), &fp);
4055 if (error != 0)
4056 return (error);
4057 }
4058
4059 NDPREINIT(&nd);
4060 restart:
4061 bwillwrite();
4062 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
4063 at2cnpflags(flag, AT_RESOLVE_BENEATH),
4064 pathseg, path, dfd, &cap_unlinkat_rights);
4065 if ((error = namei(&nd)) != 0)
4066 goto fdout;
4067 vp = nd.ni_vp;
4068 if (vp->v_type != VDIR) {
4069 error = ENOTDIR;
4070 goto out;
4071 }
4072 /*
4073 * No rmdir "." please.
4074 */
4075 if (nd.ni_dvp == vp) {
4076 error = EINVAL;
4077 goto out;
4078 }
4079 /*
4080 * The root of a mounted filesystem cannot be deleted.
4081 */
4082 if (vp->v_vflag & VV_ROOT) {
4083 error = EBUSY;
4084 goto out;
4085 }
4086
4087 if (fp != NULL && fp->f_vnode != vp) {
4088 if (VN_IS_DOOMED(fp->f_vnode))
4089 error = EBADF;
4090 else
4091 error = EDEADLK;
4092 goto out;
4093 }
4094
4095 #ifdef MAC
4096 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
4097 &nd.ni_cnd);
4098 if (error != 0)
4099 goto out;
4100 #endif
4101 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
4102 NDFREE_PNBUF(&nd);
4103 vput(vp);
4104 if (nd.ni_dvp == vp)
4105 vrele(nd.ni_dvp);
4106 else
4107 vput(nd.ni_dvp);
4108 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | V_PCATCH)) != 0)
4109 goto fdout;
4110 goto restart;
4111 }
4112 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
4113 vn_finished_write(mp);
4114 out:
4115 NDFREE_PNBUF(&nd);
4116 vput(vp);
4117 if (nd.ni_dvp == vp)
4118 vrele(nd.ni_dvp);
4119 else
4120 vput(nd.ni_dvp);
4121 if (error == ERELOOKUP)
4122 goto restart;
4123 fdout:
4124 if (fp != NULL)
4125 fdrop(fp, td);
4126 return (error);
4127 }
4128
4129 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
4130 int
freebsd11_kern_getdirentries(struct thread * td,int fd,char * ubuf,u_int count,long * basep,void (* func)(struct freebsd11_dirent *))4131 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count,
4132 long *basep, void (*func)(struct freebsd11_dirent *))
4133 {
4134 struct freebsd11_dirent dstdp;
4135 struct dirent *dp, *edp;
4136 char *dirbuf;
4137 off_t base;
4138 ssize_t resid, ucount;
4139 int error;
4140
4141 /* XXX arbitrary sanity limit on `count'. */
4142 count = min(count, 64 * 1024);
4143
4144 dirbuf = malloc(count, M_TEMP, M_WAITOK);
4145
4146 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid,
4147 UIO_SYSSPACE);
4148 if (error != 0)
4149 goto done;
4150 if (basep != NULL)
4151 *basep = base;
4152
4153 ucount = 0;
4154 for (dp = (struct dirent *)dirbuf,
4155 edp = (struct dirent *)&dirbuf[count - resid];
4156 ucount < count && dp < edp; ) {
4157 if (dp->d_reclen == 0)
4158 break;
4159 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0));
4160 if (dp->d_namlen >= sizeof(dstdp.d_name))
4161 continue;
4162 dstdp.d_type = dp->d_type;
4163 dstdp.d_namlen = dp->d_namlen;
4164 dstdp.d_fileno = dp->d_fileno; /* truncate */
4165 if (dstdp.d_fileno != dp->d_fileno) {
4166 switch (ino64_trunc_error) {
4167 default:
4168 case 0:
4169 break;
4170 case 1:
4171 error = EOVERFLOW;
4172 goto done;
4173 case 2:
4174 dstdp.d_fileno = UINT32_MAX;
4175 break;
4176 }
4177 }
4178 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) +
4179 ((dp->d_namlen + 1 + 3) &~ 3);
4180 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
4181 bzero(dstdp.d_name + dstdp.d_namlen,
4182 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) -
4183 dstdp.d_namlen);
4184 MPASS(dstdp.d_reclen <= dp->d_reclen);
4185 MPASS(ucount + dstdp.d_reclen <= count);
4186 if (func != NULL)
4187 func(&dstdp);
4188 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen);
4189 if (error != 0)
4190 break;
4191 dp = (struct dirent *)((char *)dp + dp->d_reclen);
4192 ucount += dstdp.d_reclen;
4193 }
4194
4195 done:
4196 free(dirbuf, M_TEMP);
4197 if (error == 0)
4198 td->td_retval[0] = ucount;
4199 return (error);
4200 }
4201 #endif /* COMPAT */
4202
4203 #ifdef COMPAT_43
4204 static void
ogetdirentries_cvt(struct freebsd11_dirent * dp)4205 ogetdirentries_cvt(struct freebsd11_dirent *dp)
4206 {
4207 #if (BYTE_ORDER == LITTLE_ENDIAN)
4208 /*
4209 * The expected low byte of dp->d_namlen is our dp->d_type.
4210 * The high MBZ byte of dp->d_namlen is our dp->d_namlen.
4211 */
4212 dp->d_type = dp->d_namlen;
4213 dp->d_namlen = 0;
4214 #else
4215 /*
4216 * The dp->d_type is the high byte of the expected dp->d_namlen,
4217 * so must be zero'ed.
4218 */
4219 dp->d_type = 0;
4220 #endif
4221 }
4222
4223 /*
4224 * Read a block of directory entries in a filesystem independent format.
4225 */
4226 #ifndef _SYS_SYSPROTO_H_
4227 struct ogetdirentries_args {
4228 int fd;
4229 char *buf;
4230 u_int count;
4231 long *basep;
4232 };
4233 #endif
4234 int
ogetdirentries(struct thread * td,struct ogetdirentries_args * uap)4235 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
4236 {
4237 long loff;
4238 int error;
4239
4240 error = kern_ogetdirentries(td, uap, &loff);
4241 if (error == 0)
4242 error = copyout(&loff, uap->basep, sizeof(long));
4243 return (error);
4244 }
4245
4246 int
kern_ogetdirentries(struct thread * td,struct ogetdirentries_args * uap,long * ploff)4247 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
4248 long *ploff)
4249 {
4250 long base;
4251 int error;
4252
4253 /* XXX arbitrary sanity limit on `count'. */
4254 if (uap->count > 64 * 1024)
4255 return (EINVAL);
4256
4257 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
4258 &base, ogetdirentries_cvt);
4259
4260 if (error == 0 && uap->basep != NULL)
4261 error = copyout(&base, uap->basep, sizeof(long));
4262
4263 return (error);
4264 }
4265 #endif /* COMPAT_43 */
4266
4267 #if defined(COMPAT_FREEBSD11)
4268 #ifndef _SYS_SYSPROTO_H_
4269 struct freebsd11_getdirentries_args {
4270 int fd;
4271 char *buf;
4272 u_int count;
4273 long *basep;
4274 };
4275 #endif
4276 int
freebsd11_getdirentries(struct thread * td,struct freebsd11_getdirentries_args * uap)4277 freebsd11_getdirentries(struct thread *td,
4278 struct freebsd11_getdirentries_args *uap)
4279 {
4280 long base;
4281 int error;
4282
4283 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
4284 &base, NULL);
4285
4286 if (error == 0 && uap->basep != NULL)
4287 error = copyout(&base, uap->basep, sizeof(long));
4288 return (error);
4289 }
4290
4291 int
freebsd11_getdents(struct thread * td,struct freebsd11_getdents_args * uap)4292 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap)
4293 {
4294 struct freebsd11_getdirentries_args ap;
4295
4296 ap.fd = uap->fd;
4297 ap.buf = uap->buf;
4298 ap.count = uap->count;
4299 ap.basep = NULL;
4300 return (freebsd11_getdirentries(td, &ap));
4301 }
4302 #endif /* COMPAT_FREEBSD11 */
4303
4304 /*
4305 * Read a block of directory entries in a filesystem independent format.
4306 */
4307 int
sys_getdirentries(struct thread * td,struct getdirentries_args * uap)4308 sys_getdirentries(struct thread *td, struct getdirentries_args *uap)
4309 {
4310 off_t base;
4311 int error;
4312
4313 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
4314 NULL, UIO_USERSPACE);
4315 if (error != 0)
4316 return (error);
4317 if (uap->basep != NULL)
4318 error = copyout(&base, uap->basep, sizeof(off_t));
4319 return (error);
4320 }
4321
4322 int
kern_getdirentries(struct thread * td,int fd,char * buf,size_t count,off_t * basep,ssize_t * residp,enum uio_seg bufseg)4323 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count,
4324 off_t *basep, ssize_t *residp, enum uio_seg bufseg)
4325 {
4326 struct vnode *vp;
4327 struct file *fp;
4328 struct uio auio;
4329 struct iovec aiov;
4330 off_t loff;
4331 int error, eofflag;
4332 off_t foffset;
4333
4334 AUDIT_ARG_FD(fd);
4335 if (count > IOSIZE_MAX)
4336 return (EINVAL);
4337 auio.uio_resid = count;
4338 error = getvnode(td, fd, &cap_read_rights, &fp);
4339 if (error != 0)
4340 return (error);
4341 if ((fp->f_flag & FREAD) == 0) {
4342 fdrop(fp, td);
4343 return (EBADF);
4344 }
4345 vp = fp->f_vnode;
4346 foffset = foffset_lock(fp, 0);
4347 unionread:
4348 if (__predict_false((vp->v_vflag & VV_UNLINKED) != 0)) {
4349 error = ENOENT;
4350 goto fail;
4351 }
4352 aiov.iov_base = buf;
4353 aiov.iov_len = count;
4354 auio.uio_iov = &aiov;
4355 auio.uio_iovcnt = 1;
4356 auio.uio_rw = UIO_READ;
4357 auio.uio_segflg = bufseg;
4358 auio.uio_td = td;
4359 vn_lock(vp, LK_SHARED | LK_RETRY);
4360 /*
4361 * We want to return ENOTDIR for anything that is not VDIR, but
4362 * not for VBAD, and we can't check for VBAD while the vnode is
4363 * unlocked.
4364 */
4365 if (vp->v_type != VDIR) {
4366 if (vp->v_type == VBAD)
4367 error = EBADF;
4368 else
4369 error = ENOTDIR;
4370 VOP_UNLOCK(vp);
4371 goto fail;
4372 }
4373 AUDIT_ARG_VNODE1(vp);
4374 loff = auio.uio_offset = foffset;
4375 #ifdef MAC
4376 error = mac_vnode_check_readdir(td->td_ucred, vp);
4377 if (error == 0)
4378 #endif
4379 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4380 NULL);
4381 foffset = auio.uio_offset;
4382 if (error != 0) {
4383 VOP_UNLOCK(vp);
4384 goto fail;
4385 }
4386 if (count == auio.uio_resid &&
4387 (vp->v_vflag & VV_ROOT) &&
4388 (vp->v_mount->mnt_flag & MNT_UNION)) {
4389 struct vnode *tvp = vp;
4390
4391 vp = vp->v_mount->mnt_vnodecovered;
4392 vref(vp);
4393 fp->f_vnode = vp;
4394 foffset = 0;
4395 vput(tvp);
4396 goto unionread;
4397 }
4398 VOP_UNLOCK(vp);
4399 *basep = loff;
4400 if (residp != NULL)
4401 *residp = auio.uio_resid;
4402 td->td_retval[0] = count - auio.uio_resid;
4403 fail:
4404 foffset_unlock(fp, foffset, 0);
4405 fdrop(fp, td);
4406 return (error);
4407 }
4408
4409 /*
4410 * Set the mode mask for creation of filesystem nodes.
4411 */
4412 #ifndef _SYS_SYSPROTO_H_
4413 struct umask_args {
4414 int newmask;
4415 };
4416 #endif
4417 int
sys_umask(struct thread * td,struct umask_args * uap)4418 sys_umask(struct thread *td, struct umask_args *uap)
4419 {
4420 struct pwddesc *pdp;
4421
4422 pdp = td->td_proc->p_pd;
4423 PWDDESC_XLOCK(pdp);
4424 td->td_retval[0] = pdp->pd_cmask;
4425 pdp->pd_cmask = uap->newmask & ALLPERMS;
4426 PWDDESC_XUNLOCK(pdp);
4427 return (0);
4428 }
4429
4430 /*
4431 * Void all references to file by ripping underlying filesystem away from
4432 * vnode.
4433 */
4434 #ifndef _SYS_SYSPROTO_H_
4435 struct revoke_args {
4436 char *path;
4437 };
4438 #endif
4439 int
sys_revoke(struct thread * td,struct revoke_args * uap)4440 sys_revoke(struct thread *td, struct revoke_args *uap)
4441 {
4442 struct vnode *vp;
4443 struct vattr vattr;
4444 struct nameidata nd;
4445 int error;
4446
4447 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4448 uap->path);
4449 if ((error = namei(&nd)) != 0)
4450 return (error);
4451 vp = nd.ni_vp;
4452 NDFREE_PNBUF(&nd);
4453 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4454 error = EINVAL;
4455 goto out;
4456 }
4457 #ifdef MAC
4458 error = mac_vnode_check_revoke(td->td_ucred, vp);
4459 if (error != 0)
4460 goto out;
4461 #endif
4462 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4463 if (error != 0)
4464 goto out;
4465 if (td->td_ucred->cr_uid != vattr.va_uid) {
4466 error = priv_check(td, PRIV_VFS_ADMIN);
4467 if (error != 0)
4468 goto out;
4469 }
4470 if (devfs_usecount(vp) > 0)
4471 VOP_REVOKE(vp, REVOKEALL);
4472 out:
4473 vput(vp);
4474 return (error);
4475 }
4476
4477 /*
4478 * This variant of getvnode() allows O_PATH files. Caller should
4479 * ensure that returned file and vnode are only used for compatible
4480 * semantics.
4481 */
4482 int
getvnode_path(struct thread * td,int fd,const cap_rights_t * rightsp,uint8_t * flagsp,struct file ** fpp)4483 getvnode_path(struct thread *td, int fd, const cap_rights_t *rightsp,
4484 uint8_t *flagsp, struct file **fpp)
4485 {
4486 struct file *fp;
4487 int error;
4488
4489 error = fget_unlocked_flags(td, fd, rightsp, flagsp, &fp);
4490 if (error != 0)
4491 return (error);
4492
4493 /*
4494 * The file could be not of the vnode type, or it may be not
4495 * yet fully initialized, in which case the f_vnode pointer
4496 * may be set, but f_ops is still badfileops. E.g.,
4497 * devfs_open() transiently create such situation to
4498 * facilitate csw d_fdopen().
4499 *
4500 * Dupfdopen() handling in kern_openat() installs the
4501 * half-baked file into the process descriptor table, allowing
4502 * other thread to dereference it. Guard against the race by
4503 * checking f_ops.
4504 */
4505 if (__predict_false(fp->f_vnode == NULL || fp->f_ops == &badfileops)) {
4506 fdrop(fp, td);
4507 *fpp = NULL;
4508 return (EINVAL);
4509 }
4510
4511 *fpp = fp;
4512 return (0);
4513 }
4514
4515 /*
4516 * Convert a user file descriptor to a kernel file entry and check
4517 * that, if it is a capability, the correct rights are present.
4518 * A reference on the file entry is held upon returning.
4519 */
4520 int
getvnode(struct thread * td,int fd,const cap_rights_t * rightsp,struct file ** fpp)4521 getvnode(struct thread *td, int fd, const cap_rights_t *rightsp,
4522 struct file **fpp)
4523 {
4524 int error;
4525
4526 error = getvnode_path(td, fd, rightsp, NULL, fpp);
4527 if (__predict_false(error != 0))
4528 return (error);
4529
4530 /*
4531 * Filter out O_PATH file descriptors, most getvnode() callers
4532 * do not call fo_ methods.
4533 */
4534 if (__predict_false((*fpp)->f_ops == &path_fileops)) {
4535 fdrop(*fpp, td);
4536 *fpp = NULL;
4537 error = EBADF;
4538 }
4539
4540 return (error);
4541 }
4542
4543 /*
4544 * Get an (NFS) file handle.
4545 */
4546 #ifndef _SYS_SYSPROTO_H_
4547 struct lgetfh_args {
4548 char *fname;
4549 fhandle_t *fhp;
4550 };
4551 #endif
4552 int
sys_lgetfh(struct thread * td,struct lgetfh_args * uap)4553 sys_lgetfh(struct thread *td, struct lgetfh_args *uap)
4554 {
4555
4556 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname,
4557 UIO_USERSPACE, uap->fhp, UIO_USERSPACE));
4558 }
4559
4560 #ifndef _SYS_SYSPROTO_H_
4561 struct getfh_args {
4562 char *fname;
4563 fhandle_t *fhp;
4564 };
4565 #endif
4566 int
sys_getfh(struct thread * td,struct getfh_args * uap)4567 sys_getfh(struct thread *td, struct getfh_args *uap)
4568 {
4569
4570 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE,
4571 uap->fhp, UIO_USERSPACE));
4572 }
4573
4574 /*
4575 * syscall for the rpc.lockd to use to translate an open descriptor into
4576 * a NFS file handle.
4577 *
4578 * warning: do not remove the priv_check() call or this becomes one giant
4579 * security hole.
4580 */
4581 #ifndef _SYS_SYSPROTO_H_
4582 struct getfhat_args {
4583 int fd;
4584 char *path;
4585 fhandle_t *fhp;
4586 int flags;
4587 };
4588 #endif
4589 int
sys_getfhat(struct thread * td,struct getfhat_args * uap)4590 sys_getfhat(struct thread *td, struct getfhat_args *uap)
4591 {
4592
4593 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE,
4594 uap->fhp, UIO_USERSPACE));
4595 }
4596
4597 int
kern_getfhat(struct thread * td,int flags,int fd,const char * path,enum uio_seg pathseg,fhandle_t * fhp,enum uio_seg fhseg)4598 kern_getfhat(struct thread *td, int flags, int fd, const char *path,
4599 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg)
4600 {
4601 struct nameidata nd;
4602 fhandle_t fh;
4603 struct vnode *vp;
4604 int error;
4605
4606 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0)
4607 return (EINVAL);
4608 error = priv_check(td, PRIV_VFS_GETFH);
4609 if (error != 0)
4610 return (error);
4611 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW |
4612 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path,
4613 fd);
4614 error = namei(&nd);
4615 if (error != 0)
4616 return (error);
4617 NDFREE_PNBUF(&nd);
4618 vp = nd.ni_vp;
4619 bzero(&fh, sizeof(fh));
4620 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4621 error = VOP_VPTOFH(vp, &fh.fh_fid);
4622 vput(vp);
4623 if (error == 0) {
4624 if (fhseg == UIO_USERSPACE)
4625 error = copyout(&fh, fhp, sizeof (fh));
4626 else
4627 memcpy(fhp, &fh, sizeof(fh));
4628 }
4629 return (error);
4630 }
4631
4632 #ifndef _SYS_SYSPROTO_H_
4633 struct fhlink_args {
4634 fhandle_t *fhp;
4635 const char *to;
4636 };
4637 #endif
4638 int
sys_fhlink(struct thread * td,struct fhlink_args * uap)4639 sys_fhlink(struct thread *td, struct fhlink_args *uap)
4640 {
4641
4642 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp));
4643 }
4644
4645 #ifndef _SYS_SYSPROTO_H_
4646 struct fhlinkat_args {
4647 fhandle_t *fhp;
4648 int tofd;
4649 const char *to;
4650 };
4651 #endif
4652 int
sys_fhlinkat(struct thread * td,struct fhlinkat_args * uap)4653 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap)
4654 {
4655
4656 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp));
4657 }
4658
4659 static int
kern_fhlinkat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,fhandle_t * fhp)4660 kern_fhlinkat(struct thread *td, int fd, const char *path,
4661 enum uio_seg pathseg, fhandle_t *fhp)
4662 {
4663 fhandle_t fh;
4664 struct mount *mp;
4665 struct vnode *vp;
4666 int error;
4667
4668 error = priv_check(td, PRIV_VFS_GETFH);
4669 if (error != 0)
4670 return (error);
4671 error = copyin(fhp, &fh, sizeof(fh));
4672 if (error != 0)
4673 return (error);
4674 do {
4675 bwillwrite();
4676 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4677 return (ESTALE);
4678 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4679 vfs_unbusy(mp);
4680 if (error != 0)
4681 return (error);
4682 VOP_UNLOCK(vp);
4683 error = kern_linkat_vp(td, vp, fd, path, pathseg);
4684 } while (error == EAGAIN || error == ERELOOKUP);
4685 return (error);
4686 }
4687
4688 #ifndef _SYS_SYSPROTO_H_
4689 struct fhreadlink_args {
4690 fhandle_t *fhp;
4691 char *buf;
4692 size_t bufsize;
4693 };
4694 #endif
4695 int
sys_fhreadlink(struct thread * td,struct fhreadlink_args * uap)4696 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap)
4697 {
4698 fhandle_t fh;
4699 struct mount *mp;
4700 struct vnode *vp;
4701 int error;
4702
4703 error = priv_check(td, PRIV_VFS_GETFH);
4704 if (error != 0)
4705 return (error);
4706 if (uap->bufsize > IOSIZE_MAX)
4707 return (EINVAL);
4708 error = copyin(uap->fhp, &fh, sizeof(fh));
4709 if (error != 0)
4710 return (error);
4711 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4712 return (ESTALE);
4713 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4714 vfs_unbusy(mp);
4715 if (error != 0)
4716 return (error);
4717 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td);
4718 vput(vp);
4719 return (error);
4720 }
4721
4722 /*
4723 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4724 * open descriptor.
4725 *
4726 * warning: do not remove the priv_check() call or this becomes one giant
4727 * security hole.
4728 */
4729 #ifndef _SYS_SYSPROTO_H_
4730 struct fhopen_args {
4731 const struct fhandle *u_fhp;
4732 int flags;
4733 };
4734 #endif
4735 int
sys_fhopen(struct thread * td,struct fhopen_args * uap)4736 sys_fhopen(struct thread *td, struct fhopen_args *uap)
4737 {
4738 return (kern_fhopen(td, uap->u_fhp, uap->flags));
4739 }
4740
4741 int
kern_fhopen(struct thread * td,const struct fhandle * u_fhp,int flags)4742 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags)
4743 {
4744 struct mount *mp;
4745 struct vnode *vp;
4746 struct fhandle fhp;
4747 struct file *fp;
4748 int error, indx;
4749 bool named_attr;
4750
4751 error = priv_check(td, PRIV_VFS_FHOPEN);
4752 if (error != 0)
4753 return (error);
4754
4755 indx = -1;
4756 if ((flags & O_CREAT) != 0)
4757 return (EINVAL);
4758 error = openflags(&flags);
4759 if (error != 0)
4760 return (error);
4761 error = copyin(u_fhp, &fhp, sizeof(fhp));
4762 if (error != 0)
4763 return (error);
4764 /* find the mount point */
4765 mp = vfs_busyfs(&fhp.fh_fsid);
4766 if (mp == NULL)
4767 return (ESTALE);
4768 /* now give me my vnode, it gets returned to me locked */
4769 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4770 vfs_unbusy(mp);
4771 if (error != 0)
4772 return (error);
4773
4774 /*
4775 * Check to see if the file handle refers to a named attribute
4776 * directory or attribute. If it does, the O_NAMEDATTR flag
4777 * must have been specified.
4778 */
4779 named_attr = (vn_irflag_read(vp) &
4780 (VIRF_NAMEDDIR | VIRF_NAMEDATTR)) != 0;
4781 if ((named_attr && (flags & O_NAMEDATTR) == 0) ||
4782 (!named_attr && (flags & O_NAMEDATTR) != 0)) {
4783 vput(vp);
4784 return (ENOATTR);
4785 }
4786
4787 error = falloc_noinstall(td, &fp);
4788 if (error != 0) {
4789 vput(vp);
4790 return (error);
4791 }
4792 /* Set the flags early so the finit in devfs can pick them up. */
4793 fp->f_flag = flags & FMASK;
4794
4795 #ifdef INVARIANTS
4796 td->td_dupfd = -1;
4797 #endif
4798 error = vn_open_vnode(vp, flags, td->td_ucred, td, fp);
4799 if (error != 0) {
4800 KASSERT(fp->f_ops == &badfileops,
4801 ("VOP_OPEN in fhopen() set f_ops"));
4802 KASSERT(td->td_dupfd < 0,
4803 ("fhopen() encountered fdopen()"));
4804
4805 vput(vp);
4806 goto bad;
4807 }
4808 #ifdef INVARIANTS
4809 td->td_dupfd = 0;
4810 #endif
4811 finit_open(fp, vp, flags);
4812 VOP_UNLOCK(vp);
4813 if ((flags & O_TRUNC) != 0) {
4814 error = fo_truncate(fp, 0, td->td_ucred, td);
4815 if (error != 0)
4816 goto bad;
4817 }
4818
4819 error = finstall(td, fp, &indx, flags, NULL);
4820 bad:
4821 fdrop(fp, td);
4822 td->td_retval[0] = indx;
4823 return (error);
4824 }
4825
4826 /*
4827 * Stat an (NFS) file handle.
4828 */
4829 #ifndef _SYS_SYSPROTO_H_
4830 struct fhstat_args {
4831 struct fhandle *u_fhp;
4832 struct stat *sb;
4833 };
4834 #endif
4835 int
sys_fhstat(struct thread * td,struct fhstat_args * uap)4836 sys_fhstat(struct thread *td, struct fhstat_args *uap)
4837 {
4838 struct stat sb;
4839 struct fhandle fh;
4840 int error;
4841
4842 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4843 if (error != 0)
4844 return (error);
4845 error = kern_fhstat(td, fh, &sb);
4846 if (error == 0)
4847 error = copyout(&sb, uap->sb, sizeof(sb));
4848 return (error);
4849 }
4850
4851 int
kern_fhstat(struct thread * td,struct fhandle fh,struct stat * sb)4852 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4853 {
4854 struct mount *mp;
4855 struct vnode *vp;
4856 int error;
4857
4858 error = priv_check(td, PRIV_VFS_FHSTAT);
4859 if (error != 0)
4860 return (error);
4861 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4862 return (ESTALE);
4863 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4864 vfs_unbusy(mp);
4865 if (error != 0)
4866 return (error);
4867 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED);
4868 vput(vp);
4869 return (error);
4870 }
4871
4872 /*
4873 * Implement fstatfs() for (NFS) file handles.
4874 */
4875 #ifndef _SYS_SYSPROTO_H_
4876 struct fhstatfs_args {
4877 struct fhandle *u_fhp;
4878 struct statfs *buf;
4879 };
4880 #endif
4881 int
sys_fhstatfs(struct thread * td,struct fhstatfs_args * uap)4882 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap)
4883 {
4884 struct statfs *sfp;
4885 fhandle_t fh;
4886 int error;
4887
4888 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4889 if (error != 0)
4890 return (error);
4891 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
4892 error = kern_fhstatfs(td, fh, sfp);
4893 if (error == 0)
4894 error = copyout(sfp, uap->buf, sizeof(*sfp));
4895 free(sfp, M_STATFS);
4896 return (error);
4897 }
4898
4899 int
kern_fhstatfs(struct thread * td,fhandle_t fh,struct statfs * buf)4900 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4901 {
4902 struct mount *mp;
4903 struct vnode *vp;
4904 int error;
4905
4906 error = priv_check(td, PRIV_VFS_FHSTATFS);
4907 if (error != 0)
4908 return (error);
4909 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4910 return (ESTALE);
4911 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4912 if (error != 0) {
4913 vfs_unbusy(mp);
4914 return (error);
4915 }
4916 vput(vp);
4917 error = prison_canseemount(td->td_ucred, mp);
4918 if (error != 0)
4919 goto out;
4920 #ifdef MAC
4921 error = mac_mount_check_stat(td->td_ucred, mp);
4922 if (error != 0)
4923 goto out;
4924 #endif
4925 error = VFS_STATFS(mp, buf);
4926 out:
4927 vfs_unbusy(mp);
4928 return (error);
4929 }
4930
4931 /*
4932 * Unlike madvise(2), we do not make a best effort to remember every
4933 * possible caching hint. Instead, we remember the last setting with
4934 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4935 * region of any current setting.
4936 */
4937 int
kern_posix_fadvise(struct thread * td,int fd,off_t offset,off_t len,int advice)4938 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4939 int advice)
4940 {
4941 struct fadvise_info *fa, *new;
4942 struct file *fp;
4943 struct vnode *vp;
4944 off_t end;
4945 int error;
4946
4947 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4948 return (EINVAL);
4949 AUDIT_ARG_VALUE(advice);
4950 switch (advice) {
4951 case POSIX_FADV_SEQUENTIAL:
4952 case POSIX_FADV_RANDOM:
4953 case POSIX_FADV_NOREUSE:
4954 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4955 break;
4956 case POSIX_FADV_NORMAL:
4957 case POSIX_FADV_WILLNEED:
4958 case POSIX_FADV_DONTNEED:
4959 new = NULL;
4960 break;
4961 default:
4962 return (EINVAL);
4963 }
4964 /* XXX: CAP_POSIX_FADVISE? */
4965 AUDIT_ARG_FD(fd);
4966 error = fget(td, fd, &cap_no_rights, &fp);
4967 if (error != 0)
4968 goto out;
4969 AUDIT_ARG_FILE(td->td_proc, fp);
4970 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4971 error = ESPIPE;
4972 goto out;
4973 }
4974 if (fp->f_type != DTYPE_VNODE) {
4975 error = ENODEV;
4976 goto out;
4977 }
4978 vp = fp->f_vnode;
4979 if (vp->v_type != VREG) {
4980 error = ENODEV;
4981 goto out;
4982 }
4983 if (len == 0)
4984 end = OFF_MAX;
4985 else
4986 end = offset + len - 1;
4987 switch (advice) {
4988 case POSIX_FADV_SEQUENTIAL:
4989 case POSIX_FADV_RANDOM:
4990 case POSIX_FADV_NOREUSE:
4991 /*
4992 * Try to merge any existing non-standard region with
4993 * this new region if possible, otherwise create a new
4994 * non-standard region for this request.
4995 */
4996 mtx_pool_lock(mtxpool_sleep, fp);
4997 fa = fp->f_advice;
4998 if (fa != NULL && fa->fa_advice == advice &&
4999 ((fa->fa_start <= end && fa->fa_end >= offset) ||
5000 (end != OFF_MAX && fa->fa_start == end + 1) ||
5001 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
5002 if (offset < fa->fa_start)
5003 fa->fa_start = offset;
5004 if (end > fa->fa_end)
5005 fa->fa_end = end;
5006 } else {
5007 new->fa_advice = advice;
5008 new->fa_start = offset;
5009 new->fa_end = end;
5010 fp->f_advice = new;
5011 new = fa;
5012 }
5013 mtx_pool_unlock(mtxpool_sleep, fp);
5014 break;
5015 case POSIX_FADV_NORMAL:
5016 /*
5017 * If a the "normal" region overlaps with an existing
5018 * non-standard region, trim or remove the
5019 * non-standard region.
5020 */
5021 mtx_pool_lock(mtxpool_sleep, fp);
5022 fa = fp->f_advice;
5023 if (fa != NULL) {
5024 if (offset <= fa->fa_start && end >= fa->fa_end) {
5025 new = fa;
5026 fp->f_advice = NULL;
5027 } else if (offset <= fa->fa_start &&
5028 end >= fa->fa_start)
5029 fa->fa_start = end + 1;
5030 else if (offset <= fa->fa_end && end >= fa->fa_end)
5031 fa->fa_end = offset - 1;
5032 else if (offset >= fa->fa_start && end <= fa->fa_end) {
5033 /*
5034 * If the "normal" region is a middle
5035 * portion of the existing
5036 * non-standard region, just remove
5037 * the whole thing rather than picking
5038 * one side or the other to
5039 * preserve.
5040 */
5041 new = fa;
5042 fp->f_advice = NULL;
5043 }
5044 }
5045 mtx_pool_unlock(mtxpool_sleep, fp);
5046 break;
5047 case POSIX_FADV_WILLNEED:
5048 case POSIX_FADV_DONTNEED:
5049 error = VOP_ADVISE(vp, offset, end, advice);
5050 break;
5051 }
5052 out:
5053 if (fp != NULL)
5054 fdrop(fp, td);
5055 free(new, M_FADVISE);
5056 return (error);
5057 }
5058
5059 int
sys_posix_fadvise(struct thread * td,struct posix_fadvise_args * uap)5060 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
5061 {
5062 int error;
5063
5064 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
5065 uap->advice);
5066 return (kern_posix_error(td, error));
5067 }
5068
5069 int
kern_copy_file_range(struct thread * td,int infd,off_t * inoffp,int outfd,off_t * outoffp,size_t len,unsigned int flags)5070 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd,
5071 off_t *outoffp, size_t len, unsigned int flags)
5072 {
5073 struct file *infp, *infp1, *outfp, *outfp1;
5074 struct vnode *invp, *outvp;
5075 int error;
5076 size_t retlen;
5077 void *rl_rcookie, *rl_wcookie;
5078 off_t inoff, outoff, savinoff, savoutoff;
5079 bool foffsets_locked, foffsets_set;
5080
5081 infp = outfp = NULL;
5082 rl_rcookie = rl_wcookie = NULL;
5083 foffsets_locked = false;
5084 foffsets_set = false;
5085 error = 0;
5086 retlen = 0;
5087
5088 if ((flags & ~COPY_FILE_RANGE_USERFLAGS) != 0) {
5089 error = EINVAL;
5090 goto out;
5091 }
5092 if (len > SSIZE_MAX)
5093 /*
5094 * Although the len argument is size_t, the return argument
5095 * is ssize_t (which is signed). Therefore a size that won't
5096 * fit in ssize_t can't be returned.
5097 */
5098 len = SSIZE_MAX;
5099
5100 /* Get the file structures for the file descriptors. */
5101 error = fget_read(td, infd,
5102 inoffp != NULL ? &cap_pread_rights : &cap_read_rights, &infp);
5103 if (error != 0)
5104 goto out;
5105 if (infp->f_ops == &badfileops) {
5106 error = EBADF;
5107 goto out;
5108 }
5109 if (infp->f_vnode == NULL) {
5110 error = EINVAL;
5111 goto out;
5112 }
5113 error = fget_write(td, outfd,
5114 outoffp != NULL ? &cap_pwrite_rights : &cap_write_rights, &outfp);
5115 if (error != 0)
5116 goto out;
5117 if (outfp->f_ops == &badfileops) {
5118 error = EBADF;
5119 goto out;
5120 }
5121 if (outfp->f_vnode == NULL) {
5122 error = EINVAL;
5123 goto out;
5124 }
5125
5126 /*
5127 * Figure out which file offsets we're reading from and writing to.
5128 * If the offsets come from the file descriptions, we need to lock them,
5129 * and locking both offsets requires a loop to avoid deadlocks.
5130 */
5131 infp1 = outfp1 = NULL;
5132 if (inoffp != NULL)
5133 inoff = *inoffp;
5134 else
5135 infp1 = infp;
5136 if (outoffp != NULL)
5137 outoff = *outoffp;
5138 else
5139 outfp1 = outfp;
5140 if (infp1 != NULL || outfp1 != NULL) {
5141 if (infp1 == outfp1) {
5142 /*
5143 * Overlapping ranges are not allowed. A more thorough
5144 * check appears below, but we must not lock the same
5145 * offset twice.
5146 */
5147 error = EINVAL;
5148 goto out;
5149 }
5150 foffset_lock_pair(infp1, &inoff, outfp1, &outoff, 0);
5151 foffsets_locked = true;
5152 } else {
5153 foffsets_set = true;
5154 }
5155 savinoff = inoff;
5156 savoutoff = outoff;
5157
5158 invp = infp->f_vnode;
5159 outvp = outfp->f_vnode;
5160 /* Sanity check the f_flag bits. */
5161 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE ||
5162 (infp->f_flag & FREAD) == 0) {
5163 error = EBADF;
5164 goto out;
5165 }
5166
5167 /* If len == 0, just return 0. */
5168 if (len == 0)
5169 goto out;
5170
5171 /*
5172 * Make sure that the ranges we check and lock below are valid. Note
5173 * that len is clamped to SSIZE_MAX above.
5174 */
5175 if (inoff < 0 || outoff < 0) {
5176 error = EINVAL;
5177 goto out;
5178 }
5179
5180 /*
5181 * If infp and outfp refer to the same file, the byte ranges cannot
5182 * overlap.
5183 */
5184 if (invp == outvp) {
5185 if ((inoff <= outoff && inoff + len > outoff) ||
5186 (inoff > outoff && outoff + len > inoff)) {
5187 error = EINVAL;
5188 goto out;
5189 }
5190 rangelock_may_recurse(&invp->v_rl);
5191 }
5192
5193 /* Range lock the byte ranges for both invp and outvp. */
5194 for (;;) {
5195 rl_wcookie = vn_rangelock_wlock(outvp, outoff, outoff + len);
5196 rl_rcookie = vn_rangelock_tryrlock(invp, inoff, inoff + len);
5197 if (rl_rcookie != NULL)
5198 break;
5199 vn_rangelock_unlock(outvp, rl_wcookie);
5200 rl_rcookie = vn_rangelock_rlock(invp, inoff, inoff + len);
5201 vn_rangelock_unlock(invp, rl_rcookie);
5202 }
5203
5204 retlen = len;
5205 error = vn_copy_file_range(invp, &inoff, outvp, &outoff, &retlen,
5206 flags, infp->f_cred, outfp->f_cred, td);
5207 out:
5208 if (rl_rcookie != NULL)
5209 vn_rangelock_unlock(invp, rl_rcookie);
5210 if (rl_wcookie != NULL)
5211 vn_rangelock_unlock(outvp, rl_wcookie);
5212 if ((foffsets_locked || foffsets_set) &&
5213 (error == EINTR || error == ERESTART)) {
5214 inoff = savinoff;
5215 outoff = savoutoff;
5216 }
5217 if (foffsets_locked) {
5218 if (inoffp == NULL)
5219 foffset_unlock(infp, inoff, 0);
5220 else
5221 *inoffp = inoff;
5222 if (outoffp == NULL)
5223 foffset_unlock(outfp, outoff, 0);
5224 else
5225 *outoffp = outoff;
5226 } else if (foffsets_set) {
5227 *inoffp = inoff;
5228 *outoffp = outoff;
5229 }
5230 if (outfp != NULL)
5231 fdrop(outfp, td);
5232 if (infp != NULL)
5233 fdrop(infp, td);
5234 td->td_retval[0] = retlen;
5235 return (error);
5236 }
5237
5238 int
sys_copy_file_range(struct thread * td,struct copy_file_range_args * uap)5239 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap)
5240 {
5241 off_t inoff, outoff, *inoffp, *outoffp;
5242 int error;
5243
5244 inoffp = outoffp = NULL;
5245 if (uap->inoffp != NULL) {
5246 error = copyin(uap->inoffp, &inoff, sizeof(off_t));
5247 if (error != 0)
5248 return (error);
5249 inoffp = &inoff;
5250 }
5251 if (uap->outoffp != NULL) {
5252 error = copyin(uap->outoffp, &outoff, sizeof(off_t));
5253 if (error != 0)
5254 return (error);
5255 outoffp = &outoff;
5256 }
5257 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd,
5258 outoffp, uap->len, uap->flags);
5259 if (error == 0 && uap->inoffp != NULL)
5260 error = copyout(inoffp, uap->inoffp, sizeof(off_t));
5261 if (error == 0 && uap->outoffp != NULL)
5262 error = copyout(outoffp, uap->outoffp, sizeof(off_t));
5263 return (error);
5264 }
5265