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