1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/11.2/sys/kern/vfs_syscalls.c 338979 2018-09-27 18:32:14Z gordon $");
39
40 #include "opt_capsicum.h"
41 #include "opt_compat.h"
42 #include "opt_ktrace.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/bio.h>
47 #include <sys/buf.h>
48 #include <sys/capsicum.h>
49 #include <sys/disk.h>
50 #include <sys/sysent.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
53 #include <sys/mutex.h>
54 #include <sys/sysproto.h>
55 #include <sys/namei.h>
56 #include <sys/filedesc.h>
57 #include <sys/kernel.h>
58 #include <sys/fcntl.h>
59 #include <sys/file.h>
60 #include <sys/filio.h>
61 #include <sys/limits.h>
62 #include <sys/linker.h>
63 #include <sys/rwlock.h>
64 #include <sys/sdt.h>
65 #include <sys/stat.h>
66 #include <sys/sx.h>
67 #include <sys/unistd.h>
68 #include <sys/vnode.h>
69 #include <sys/priv.h>
70 #include <sys/proc.h>
71 #include <sys/dirent.h>
72 #include <sys/jail.h>
73 #include <sys/syscallsubr.h>
74 #include <sys/sysctl.h>
75 #ifdef KTRACE
76 #include <sys/ktrace.h>
77 #endif
78
79 #include <machine/stdarg.h>
80
81 #include <security/audit/audit.h>
82 #include <security/mac/mac_framework.h>
83
84 #include <vm/vm.h>
85 #include <vm/vm_object.h>
86 #include <vm/vm_page.h>
87 #include <vm/uma.h>
88
89 #include <ufs/ufs/quota.h>
90
91 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
92
93 SDT_PROVIDER_DEFINE(vfs);
94 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int");
95 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int");
96
97 static int kern_chflagsat(struct thread *td, int fd, const char *path,
98 enum uio_seg pathseg, u_long flags, int atflag);
99 static int setfflags(struct thread *td, struct vnode *, u_long);
100 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
101 static int getutimens(const struct timespec *, enum uio_seg,
102 struct timespec *, int *);
103 static int setutimes(struct thread *td, struct vnode *,
104 const struct timespec *, int, int);
105 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
106 struct thread *td);
107
108 /*
109 * Sync each mounted filesystem.
110 */
111 #ifndef _SYS_SYSPROTO_H_
112 struct sync_args {
113 int dummy;
114 };
115 #endif
116 /* ARGSUSED */
117 int
118 sys_sync(struct thread *td, struct sync_args *uap)
119 {
120 struct mount *mp, *nmp;
121 int save;
122
123 mtx_lock(&mountlist_mtx);
124 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
125 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
126 nmp = TAILQ_NEXT(mp, mnt_list);
127 continue;
128 }
129 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
130 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
131 save = curthread_pflags_set(TDP_SYNCIO);
132 vfs_msync(mp, MNT_NOWAIT);
133 VFS_SYNC(mp, MNT_NOWAIT);
134 curthread_pflags_restore(save);
135 vn_finished_write(mp);
136 }
137 mtx_lock(&mountlist_mtx);
138 nmp = TAILQ_NEXT(mp, mnt_list);
139 vfs_unbusy(mp);
140 }
141 mtx_unlock(&mountlist_mtx);
142 return (0);
143 }
144
145 /*
146 * Change filesystem quotas.
147 */
148 #ifndef _SYS_SYSPROTO_H_
149 struct quotactl_args {
150 char *path;
151 int cmd;
152 int uid;
153 caddr_t arg;
154 };
155 #endif
156 int
157 sys_quotactl(struct thread *td, struct quotactl_args *uap)
158 {
159 struct mount *mp;
160 struct nameidata nd;
161 int error;
162
163 AUDIT_ARG_CMD(uap->cmd);
164 AUDIT_ARG_UID(uap->uid);
165 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
166 return (EPERM);
167 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
168 uap->path, td);
169 if ((error = namei(&nd)) != 0)
170 return (error);
171 NDFREE(&nd, NDF_ONLY_PNBUF);
172 mp = nd.ni_vp->v_mount;
173 vfs_ref(mp);
174 vput(nd.ni_vp);
175 error = vfs_busy(mp, 0);
176 vfs_rel(mp);
177 if (error != 0)
178 return (error);
179 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
180
181 /*
182 * Since quota on operation typically needs to open quota
183 * file, the Q_QUOTAON handler needs to unbusy the mount point
184 * before calling into namei. Otherwise, unmount might be
185 * started between two vfs_busy() invocations (first is our,
186 * second is from mount point cross-walk code in lookup()),
187 * causing deadlock.
188 *
189 * Require that Q_QUOTAON handles the vfs_busy() reference on
190 * its own, always returning with ubusied mount point.
191 */
192 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON)
193 vfs_unbusy(mp);
194 return (error);
195 }
196
197 /*
198 * Used by statfs conversion routines to scale the block size up if
199 * necessary so that all of the block counts are <= 'max_size'. Note
200 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
201 * value of 'n'.
202 */
203 void
204 statfs_scale_blocks(struct statfs *sf, long max_size)
205 {
206 uint64_t count;
207 int shift;
208
209 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
210
211 /*
212 * Attempt to scale the block counts to give a more accurate
213 * overview to userland of the ratio of free space to used
214 * space. To do this, find the largest block count and compute
215 * a divisor that lets it fit into a signed integer <= max_size.
216 */
217 if (sf->f_bavail < 0)
218 count = -sf->f_bavail;
219 else
220 count = sf->f_bavail;
221 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
222 if (count <= max_size)
223 return;
224
225 count >>= flsl(max_size);
226 shift = 0;
227 while (count > 0) {
228 shift++;
229 count >>=1;
230 }
231
232 sf->f_bsize <<= shift;
233 sf->f_blocks >>= shift;
234 sf->f_bfree >>= shift;
235 sf->f_bavail >>= shift;
236 }
237
238 static int
239 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
240 {
241 struct statfs *sp;
242 int error;
243
244 if (mp == NULL)
245 return (EBADF);
246 error = vfs_busy(mp, 0);
247 vfs_rel(mp);
248 if (error != 0)
249 return (error);
250 #ifdef MAC
251 error = mac_mount_check_stat(td->td_ucred, mp);
252 if (error != 0)
253 goto out;
254 #endif
255 /*
256 * Set these in case the underlying filesystem fails to do so.
257 */
258 sp = &mp->mnt_stat;
259 sp->f_version = STATFS_VERSION;
260 sp->f_namemax = NAME_MAX;
261 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
262 error = VFS_STATFS(mp, sp);
263 if (error != 0)
264 goto out;
265 *buf = *sp;
266 if (priv_check(td, PRIV_VFS_GENERATION)) {
267 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
268 prison_enforce_statfs(td->td_ucred, mp, buf);
269 }
270 out:
271 vfs_unbusy(mp);
272 return (error);
273 }
274
275 /*
276 * Get filesystem statistics.
277 */
278 #ifndef _SYS_SYSPROTO_H_
279 struct statfs_args {
280 char *path;
281 struct statfs *buf;
282 };
283 #endif
284 int
285 sys_statfs(struct thread *td, struct statfs_args *uap)
286 {
287 struct statfs *sfp;
288 int error;
289
290 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
291 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
292 if (error == 0)
293 error = copyout(sfp, uap->buf, sizeof(struct statfs));
294 free(sfp, M_STATFS);
295 return (error);
296 }
297
298 int
299 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
300 struct statfs *buf)
301 {
302 struct mount *mp;
303 struct nameidata nd;
304 int error;
305
306 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
307 pathseg, path, td);
308 error = namei(&nd);
309 if (error != 0)
310 return (error);
311 mp = nd.ni_vp->v_mount;
312 vfs_ref(mp);
313 NDFREE(&nd, NDF_ONLY_PNBUF);
314 vput(nd.ni_vp);
315 return (kern_do_statfs(td, mp, buf));
316 }
317
318 /*
319 * Get filesystem statistics.
320 */
321 #ifndef _SYS_SYSPROTO_H_
322 struct fstatfs_args {
323 int fd;
324 struct statfs *buf;
325 };
326 #endif
327 int
328 sys_fstatfs(struct thread *td, struct fstatfs_args *uap)
329 {
330 struct statfs *sfp;
331 int error;
332
333 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
334 error = kern_fstatfs(td, uap->fd, sfp);
335 if (error == 0)
336 error = copyout(sfp, uap->buf, sizeof(struct statfs));
337 free(sfp, M_STATFS);
338 return (error);
339 }
340
341 int
342 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
343 {
344 struct file *fp;
345 struct mount *mp;
346 struct vnode *vp;
347 cap_rights_t rights;
348 int error;
349
350 AUDIT_ARG_FD(fd);
351 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSTATFS), &fp);
352 if (error != 0)
353 return (error);
354 vp = fp->f_vnode;
355 vn_lock(vp, LK_SHARED | LK_RETRY);
356 #ifdef AUDIT
357 AUDIT_ARG_VNODE1(vp);
358 #endif
359 mp = vp->v_mount;
360 if (mp != NULL)
361 vfs_ref(mp);
362 VOP_UNLOCK(vp, 0);
363 fdrop(fp, td);
364 return (kern_do_statfs(td, mp, buf));
365 }
366
367 /*
368 * Get statistics on all filesystems.
369 */
370 #ifndef _SYS_SYSPROTO_H_
371 struct getfsstat_args {
372 struct statfs *buf;
373 long bufsize;
374 int mode;
375 };
376 #endif
377 int
378 sys_getfsstat(struct thread *td, struct getfsstat_args *uap)
379 {
380 size_t count;
381 int error;
382
383 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX)
384 return (EINVAL);
385 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count,
386 UIO_USERSPACE, uap->mode);
387 if (error == 0)
388 td->td_retval[0] = count;
389 return (error);
390 }
391
392 /*
393 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
394 * The caller is responsible for freeing memory which will be allocated
395 * in '*buf'.
396 */
397 int
398 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
399 size_t *countp, enum uio_seg bufseg, int mode)
400 {
401 struct mount *mp, *nmp;
402 struct statfs *sfsp, *sp, *sptmp, *tofree;
403 size_t count, maxcount;
404 int error;
405
406 switch (mode) {
407 case MNT_WAIT:
408 case MNT_NOWAIT:
409 break;
410 default:
411 return (EINVAL);
412 }
413 restart:
414 maxcount = bufsize / sizeof(struct statfs);
415 if (bufsize == 0) {
416 sfsp = NULL;
417 tofree = NULL;
418 } else if (bufseg == UIO_USERSPACE) {
419 sfsp = *buf;
420 tofree = NULL;
421 } else /* if (bufseg == UIO_SYSSPACE) */ {
422 count = 0;
423 mtx_lock(&mountlist_mtx);
424 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
425 count++;
426 }
427 mtx_unlock(&mountlist_mtx);
428 if (maxcount > count)
429 maxcount = count;
430 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs),
431 M_STATFS, M_WAITOK);
432 }
433 count = 0;
434 mtx_lock(&mountlist_mtx);
435 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
436 if (prison_canseemount(td->td_ucred, mp) != 0) {
437 nmp = TAILQ_NEXT(mp, mnt_list);
438 continue;
439 }
440 #ifdef MAC
441 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
442 nmp = TAILQ_NEXT(mp, mnt_list);
443 continue;
444 }
445 #endif
446 if (mode == MNT_WAIT) {
447 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) {
448 /*
449 * If vfs_busy() failed, and MBF_NOWAIT
450 * wasn't passed, then the mp is gone.
451 * Furthermore, because of MBF_MNTLSTLOCK,
452 * the mountlist_mtx was dropped. We have
453 * no other choice than to start over.
454 */
455 mtx_unlock(&mountlist_mtx);
456 free(tofree, M_STATFS);
457 goto restart;
458 }
459 } else {
460 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
461 nmp = TAILQ_NEXT(mp, mnt_list);
462 continue;
463 }
464 }
465 if (sfsp != NULL && count < maxcount) {
466 sp = &mp->mnt_stat;
467 /*
468 * Set these in case the underlying filesystem
469 * fails to do so.
470 */
471 sp->f_version = STATFS_VERSION;
472 sp->f_namemax = NAME_MAX;
473 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
474 /*
475 * If MNT_NOWAIT is specified, do not refresh
476 * the fsstat cache.
477 */
478 if (mode != MNT_NOWAIT) {
479 error = VFS_STATFS(mp, sp);
480 if (error != 0) {
481 mtx_lock(&mountlist_mtx);
482 nmp = TAILQ_NEXT(mp, mnt_list);
483 vfs_unbusy(mp);
484 continue;
485 }
486 }
487 if (priv_check(td, PRIV_VFS_GENERATION)) {
488 sptmp = malloc(sizeof(struct statfs), M_STATFS,
489 M_WAITOK);
490 *sptmp = *sp;
491 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0;
492 prison_enforce_statfs(td->td_ucred, mp, sptmp);
493 sp = sptmp;
494 } else
495 sptmp = NULL;
496 if (bufseg == UIO_SYSSPACE) {
497 bcopy(sp, sfsp, sizeof(*sp));
498 free(sptmp, M_STATFS);
499 } else /* if (bufseg == UIO_USERSPACE) */ {
500 error = copyout(sp, sfsp, sizeof(*sp));
501 free(sptmp, M_STATFS);
502 if (error != 0) {
503 vfs_unbusy(mp);
504 return (error);
505 }
506 }
507 sfsp++;
508 }
509 count++;
510 mtx_lock(&mountlist_mtx);
511 nmp = TAILQ_NEXT(mp, mnt_list);
512 vfs_unbusy(mp);
513 }
514 mtx_unlock(&mountlist_mtx);
515 if (sfsp != NULL && count > maxcount)
516 *countp = maxcount;
517 else
518 *countp = count;
519 return (0);
520 }
521
522 #ifdef COMPAT_FREEBSD4
523 /*
524 * Get old format filesystem statistics.
525 */
526 static void cvtstatfs(struct statfs *, struct ostatfs *);
527
528 #ifndef _SYS_SYSPROTO_H_
529 struct freebsd4_statfs_args {
530 char *path;
531 struct ostatfs *buf;
532 };
533 #endif
534 int
535 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap)
536 {
537 struct ostatfs osb;
538 struct statfs *sfp;
539 int error;
540
541 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
542 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
543 if (error == 0) {
544 cvtstatfs(sfp, &osb);
545 error = copyout(&osb, uap->buf, sizeof(osb));
546 }
547 free(sfp, M_STATFS);
548 return (error);
549 }
550
551 /*
552 * Get filesystem statistics.
553 */
554 #ifndef _SYS_SYSPROTO_H_
555 struct freebsd4_fstatfs_args {
556 int fd;
557 struct ostatfs *buf;
558 };
559 #endif
560 int
561 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap)
562 {
563 struct ostatfs osb;
564 struct statfs *sfp;
565 int error;
566
567 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
568 error = kern_fstatfs(td, uap->fd, sfp);
569 if (error == 0) {
570 cvtstatfs(sfp, &osb);
571 error = copyout(&osb, uap->buf, sizeof(osb));
572 }
573 free(sfp, M_STATFS);
574 return (error);
575 }
576
577 /*
578 * Get statistics on all filesystems.
579 */
580 #ifndef _SYS_SYSPROTO_H_
581 struct freebsd4_getfsstat_args {
582 struct ostatfs *buf;
583 long bufsize;
584 int mode;
585 };
586 #endif
587 int
588 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap)
589 {
590 struct statfs *buf, *sp;
591 struct ostatfs osb;
592 size_t count, size;
593 int error;
594
595 if (uap->bufsize < 0)
596 return (EINVAL);
597 count = uap->bufsize / sizeof(struct ostatfs);
598 if (count > SIZE_MAX / sizeof(struct statfs))
599 return (EINVAL);
600 size = count * sizeof(struct statfs);
601 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
602 uap->mode);
603 if (buf == NULL)
604 return (EINVAL);
605 td->td_retval[0] = count;
606 if (size != 0) {
607 sp = buf;
608 while (count != 0 && error == 0) {
609 cvtstatfs(sp, &osb);
610 error = copyout(&osb, uap->buf, sizeof(osb));
611 sp++;
612 uap->buf++;
613 count--;
614 }
615 free(buf, M_STATFS);
616 }
617 return (error);
618 }
619
620 /*
621 * Implement fstatfs() for (NFS) file handles.
622 */
623 #ifndef _SYS_SYSPROTO_H_
624 struct freebsd4_fhstatfs_args {
625 struct fhandle *u_fhp;
626 struct ostatfs *buf;
627 };
628 #endif
629 int
630 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap)
631 {
632 struct ostatfs osb;
633 struct statfs *sfp;
634 fhandle_t fh;
635 int error;
636
637 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
638 if (error != 0)
639 return (error);
640 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
641 error = kern_fhstatfs(td, fh, sfp);
642 if (error == 0) {
643 cvtstatfs(sfp, &osb);
644 error = copyout(&osb, uap->buf, sizeof(osb));
645 }
646 free(sfp, M_STATFS);
647 return (error);
648 }
649
650 /*
651 * Convert a new format statfs structure to an old format statfs structure.
652 */
653 static void
654 cvtstatfs(struct statfs *nsp, struct ostatfs *osp)
655 {
656
657 statfs_scale_blocks(nsp, LONG_MAX);
658 bzero(osp, sizeof(*osp));
659 osp->f_bsize = nsp->f_bsize;
660 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
661 osp->f_blocks = nsp->f_blocks;
662 osp->f_bfree = nsp->f_bfree;
663 osp->f_bavail = nsp->f_bavail;
664 osp->f_files = MIN(nsp->f_files, LONG_MAX);
665 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
666 osp->f_owner = nsp->f_owner;
667 osp->f_type = nsp->f_type;
668 osp->f_flags = nsp->f_flags;
669 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
670 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
671 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
672 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
673 strlcpy(osp->f_fstypename, nsp->f_fstypename,
674 MIN(MFSNAMELEN, OMFSNAMELEN));
675 strlcpy(osp->f_mntonname, nsp->f_mntonname,
676 MIN(MNAMELEN, OMNAMELEN));
677 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
678 MIN(MNAMELEN, OMNAMELEN));
679 osp->f_fsid = nsp->f_fsid;
680 }
681 #endif /* COMPAT_FREEBSD4 */
682
683 /*
684 * Change current working directory to a given file descriptor.
685 */
686 #ifndef _SYS_SYSPROTO_H_
687 struct fchdir_args {
688 int fd;
689 };
690 #endif
691 int
692 sys_fchdir(struct thread *td, struct fchdir_args *uap)
693 {
694 struct vnode *vp, *tdp;
695 struct mount *mp;
696 struct file *fp;
697 cap_rights_t rights;
698 int error;
699
700 AUDIT_ARG_FD(uap->fd);
701 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHDIR),
702 &fp);
703 if (error != 0)
704 return (error);
705 vp = fp->f_vnode;
706 vrefact(vp);
707 fdrop(fp, td);
708 vn_lock(vp, LK_SHARED | LK_RETRY);
709 AUDIT_ARG_VNODE1(vp);
710 error = change_dir(vp, td);
711 while (!error && (mp = vp->v_mountedhere) != NULL) {
712 if (vfs_busy(mp, 0))
713 continue;
714 error = VFS_ROOT(mp, LK_SHARED, &tdp);
715 vfs_unbusy(mp);
716 if (error != 0)
717 break;
718 vput(vp);
719 vp = tdp;
720 }
721 if (error != 0) {
722 vput(vp);
723 return (error);
724 }
725 VOP_UNLOCK(vp, 0);
726 pwd_chdir(td, vp);
727 return (0);
728 }
729
730 /*
731 * Change current working directory (``.'').
732 */
733 #ifndef _SYS_SYSPROTO_H_
734 struct chdir_args {
735 char *path;
736 };
737 #endif
738 int
739 sys_chdir(struct thread *td, struct chdir_args *uap)
740 {
741
742 return (kern_chdir(td, uap->path, UIO_USERSPACE));
743 }
744
745 int
746 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
747 {
748 struct nameidata nd;
749 int error;
750
751 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
752 pathseg, path, td);
753 if ((error = namei(&nd)) != 0)
754 return (error);
755 if ((error = change_dir(nd.ni_vp, td)) != 0) {
756 vput(nd.ni_vp);
757 NDFREE(&nd, NDF_ONLY_PNBUF);
758 return (error);
759 }
760 VOP_UNLOCK(nd.ni_vp, 0);
761 NDFREE(&nd, NDF_ONLY_PNBUF);
762 pwd_chdir(td, nd.ni_vp);
763 return (0);
764 }
765
766 /*
767 * Change notion of root (``/'') directory.
768 */
769 #ifndef _SYS_SYSPROTO_H_
770 struct chroot_args {
771 char *path;
772 };
773 #endif
774 int
775 sys_chroot(struct thread *td, struct chroot_args *uap)
776 {
777 struct nameidata nd;
778 int error;
779
780 error = priv_check(td, PRIV_VFS_CHROOT);
781 if (error != 0)
782 return (error);
783 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
784 UIO_USERSPACE, uap->path, td);
785 error = namei(&nd);
786 if (error != 0)
787 goto error;
788 error = change_dir(nd.ni_vp, td);
789 if (error != 0)
790 goto e_vunlock;
791 #ifdef MAC
792 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
793 if (error != 0)
794 goto e_vunlock;
795 #endif
796 VOP_UNLOCK(nd.ni_vp, 0);
797 error = pwd_chroot(td, nd.ni_vp);
798 vrele(nd.ni_vp);
799 NDFREE(&nd, NDF_ONLY_PNBUF);
800 return (error);
801 e_vunlock:
802 vput(nd.ni_vp);
803 error:
804 NDFREE(&nd, NDF_ONLY_PNBUF);
805 return (error);
806 }
807
808 /*
809 * Common routine for chroot and chdir. Callers must provide a locked vnode
810 * instance.
811 */
812 int
813 change_dir(struct vnode *vp, struct thread *td)
814 {
815 #ifdef MAC
816 int error;
817 #endif
818
819 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
820 if (vp->v_type != VDIR)
821 return (ENOTDIR);
822 #ifdef MAC
823 error = mac_vnode_check_chdir(td->td_ucred, vp);
824 if (error != 0)
825 return (error);
826 #endif
827 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
828 }
829
830 static __inline void
831 flags_to_rights(int flags, cap_rights_t *rightsp)
832 {
833
834 if (flags & O_EXEC) {
835 cap_rights_set(rightsp, CAP_FEXECVE);
836 } else {
837 switch ((flags & O_ACCMODE)) {
838 case O_RDONLY:
839 cap_rights_set(rightsp, CAP_READ);
840 break;
841 case O_RDWR:
842 cap_rights_set(rightsp, CAP_READ);
843 /* FALLTHROUGH */
844 case O_WRONLY:
845 cap_rights_set(rightsp, CAP_WRITE);
846 if (!(flags & (O_APPEND | O_TRUNC)))
847 cap_rights_set(rightsp, CAP_SEEK);
848 break;
849 }
850 }
851
852 if (flags & O_CREAT)
853 cap_rights_set(rightsp, CAP_CREATE);
854
855 if (flags & O_TRUNC)
856 cap_rights_set(rightsp, CAP_FTRUNCATE);
857
858 if (flags & (O_SYNC | O_FSYNC))
859 cap_rights_set(rightsp, CAP_FSYNC);
860
861 if (flags & (O_EXLOCK | O_SHLOCK))
862 cap_rights_set(rightsp, CAP_FLOCK);
863 }
864
865 /*
866 * Check permissions, allocate an open file structure, and call the device
867 * open routine if any.
868 */
869 #ifndef _SYS_SYSPROTO_H_
870 struct open_args {
871 char *path;
872 int flags;
873 int mode;
874 };
875 #endif
876 int
877 sys_open(struct thread *td, struct open_args *uap)
878 {
879
880 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
881 uap->flags, uap->mode));
882 }
883
884 #ifndef _SYS_SYSPROTO_H_
885 struct openat_args {
886 int fd;
887 char *path;
888 int flag;
889 int mode;
890 };
891 #endif
892 int
893 sys_openat(struct thread *td, struct openat_args *uap)
894 {
895
896 AUDIT_ARG_FD(uap->fd);
897 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
898 uap->mode));
899 }
900
901 int
902 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
903 int flags, int mode)
904 {
905 struct proc *p = td->td_proc;
906 struct filedesc *fdp = p->p_fd;
907 struct file *fp;
908 struct vnode *vp;
909 struct nameidata nd;
910 cap_rights_t rights;
911 int cmode, error, indx;
912
913 indx = -1;
914
915 AUDIT_ARG_FFLAGS(flags);
916 AUDIT_ARG_MODE(mode);
917 cap_rights_init(&rights, CAP_LOOKUP);
918 flags_to_rights(flags, &rights);
919 /*
920 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
921 * may be specified.
922 */
923 if (flags & O_EXEC) {
924 if (flags & O_ACCMODE)
925 return (EINVAL);
926 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
927 return (EINVAL);
928 } else {
929 flags = FFLAGS(flags);
930 }
931
932 /*
933 * Allocate a file structure. The descriptor to reference it
934 * is allocated and set by finstall() below.
935 */
936 error = falloc_noinstall(td, &fp);
937 if (error != 0)
938 return (error);
939 /*
940 * An extra reference on `fp' has been held for us by
941 * falloc_noinstall().
942 */
943 /* Set the flags early so the finit in devfs can pick them up. */
944 fp->f_flag = flags & FMASK;
945 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
946 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
947 &rights, td);
948 td->td_dupfd = -1; /* XXX check for fdopen */
949 error = vn_open(&nd, &flags, cmode, fp);
950 if (error != 0) {
951 /*
952 * If the vn_open replaced the method vector, something
953 * wonderous happened deep below and we just pass it up
954 * pretending we know what we do.
955 */
956 if (error == ENXIO && fp->f_ops != &badfileops)
957 goto success;
958
959 /*
960 * Handle special fdopen() case. bleh.
961 *
962 * Don't do this for relative (capability) lookups; we don't
963 * understand exactly what would happen, and we don't think
964 * that it ever should.
965 */
966 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 &&
967 (error == ENODEV || error == ENXIO) &&
968 td->td_dupfd >= 0) {
969 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
970 &indx);
971 if (error == 0)
972 goto success;
973 }
974
975 goto bad;
976 }
977 td->td_dupfd = 0;
978 NDFREE(&nd, NDF_ONLY_PNBUF);
979 vp = nd.ni_vp;
980
981 /*
982 * Store the vnode, for any f_type. Typically, the vnode use
983 * count is decremented by direct call to vn_closefile() for
984 * files that switched type in the cdevsw fdopen() method.
985 */
986 fp->f_vnode = vp;
987 /*
988 * If the file wasn't claimed by devfs bind it to the normal
989 * vnode operations here.
990 */
991 if (fp->f_ops == &badfileops) {
992 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
993 fp->f_seqcount = 1;
994 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK),
995 DTYPE_VNODE, vp, &vnops);
996 }
997
998 VOP_UNLOCK(vp, 0);
999 if (flags & O_TRUNC) {
1000 error = fo_truncate(fp, 0, td->td_ucred, td);
1001 if (error != 0)
1002 goto bad;
1003 }
1004 success:
1005 /*
1006 * If we haven't already installed the FD (for dupfdopen), do so now.
1007 */
1008 if (indx == -1) {
1009 struct filecaps *fcaps;
1010
1011 #ifdef CAPABILITIES
1012 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0)
1013 fcaps = &nd.ni_filecaps;
1014 else
1015 #endif
1016 fcaps = NULL;
1017 error = finstall(td, fp, &indx, flags, fcaps);
1018 /* On success finstall() consumes fcaps. */
1019 if (error != 0) {
1020 filecaps_free(&nd.ni_filecaps);
1021 goto bad;
1022 }
1023 } else {
1024 filecaps_free(&nd.ni_filecaps);
1025 }
1026
1027 /*
1028 * Release our private reference, leaving the one associated with
1029 * the descriptor table intact.
1030 */
1031 fdrop(fp, td);
1032 td->td_retval[0] = indx;
1033 return (0);
1034 bad:
1035 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1036 fdrop(fp, td);
1037 return (error);
1038 }
1039
1040 #ifdef COMPAT_43
1041 /*
1042 * Create a file.
1043 */
1044 #ifndef _SYS_SYSPROTO_H_
1045 struct ocreat_args {
1046 char *path;
1047 int mode;
1048 };
1049 #endif
1050 int
1051 ocreat(struct thread *td, struct ocreat_args *uap)
1052 {
1053
1054 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1055 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1056 }
1057 #endif /* COMPAT_43 */
1058
1059 /*
1060 * Create a special file.
1061 */
1062 #ifndef _SYS_SYSPROTO_H_
1063 struct mknod_args {
1064 char *path;
1065 int mode;
1066 int dev;
1067 };
1068 #endif
1069 int
1070 sys_mknod(struct thread *td, struct mknod_args *uap)
1071 {
1072
1073 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1074 uap->mode, uap->dev));
1075 }
1076
1077 #ifndef _SYS_SYSPROTO_H_
1078 struct mknodat_args {
1079 int fd;
1080 char *path;
1081 mode_t mode;
1082 dev_t dev;
1083 };
1084 #endif
1085 int
1086 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1087 {
1088
1089 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1090 uap->dev));
1091 }
1092
1093 int
1094 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1095 int mode, int dev)
1096 {
1097 struct vnode *vp;
1098 struct mount *mp;
1099 struct vattr vattr;
1100 struct nameidata nd;
1101 cap_rights_t rights;
1102 int error, whiteout = 0;
1103
1104 AUDIT_ARG_MODE(mode);
1105 AUDIT_ARG_DEV(dev);
1106 switch (mode & S_IFMT) {
1107 case S_IFCHR:
1108 case S_IFBLK:
1109 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1110 if (error == 0 && dev == VNOVAL)
1111 error = EINVAL;
1112 break;
1113 case S_IFWHT:
1114 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1115 break;
1116 case S_IFIFO:
1117 if (dev == 0)
1118 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1119 /* FALLTHROUGH */
1120 default:
1121 error = EINVAL;
1122 break;
1123 }
1124 if (error != 0)
1125 return (error);
1126 restart:
1127 bwillwrite();
1128 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1129 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKNODAT),
1130 td);
1131 if ((error = namei(&nd)) != 0)
1132 return (error);
1133 vp = nd.ni_vp;
1134 if (vp != NULL) {
1135 NDFREE(&nd, NDF_ONLY_PNBUF);
1136 if (vp == nd.ni_dvp)
1137 vrele(nd.ni_dvp);
1138 else
1139 vput(nd.ni_dvp);
1140 vrele(vp);
1141 return (EEXIST);
1142 } else {
1143 VATTR_NULL(&vattr);
1144 vattr.va_mode = (mode & ALLPERMS) &
1145 ~td->td_proc->p_fd->fd_cmask;
1146 vattr.va_rdev = dev;
1147 whiteout = 0;
1148
1149 switch (mode & S_IFMT) {
1150 case S_IFCHR:
1151 vattr.va_type = VCHR;
1152 break;
1153 case S_IFBLK:
1154 vattr.va_type = VBLK;
1155 break;
1156 case S_IFWHT:
1157 whiteout = 1;
1158 break;
1159 default:
1160 panic("kern_mknod: invalid mode");
1161 }
1162 }
1163 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1164 NDFREE(&nd, NDF_ONLY_PNBUF);
1165 vput(nd.ni_dvp);
1166 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1167 return (error);
1168 goto restart;
1169 }
1170 #ifdef MAC
1171 if (error == 0 && !whiteout)
1172 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1173 &nd.ni_cnd, &vattr);
1174 #endif
1175 if (error == 0) {
1176 if (whiteout)
1177 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1178 else {
1179 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1180 &nd.ni_cnd, &vattr);
1181 if (error == 0)
1182 vput(nd.ni_vp);
1183 }
1184 }
1185 NDFREE(&nd, NDF_ONLY_PNBUF);
1186 vput(nd.ni_dvp);
1187 vn_finished_write(mp);
1188 return (error);
1189 }
1190
1191 /*
1192 * Create a named pipe.
1193 */
1194 #ifndef _SYS_SYSPROTO_H_
1195 struct mkfifo_args {
1196 char *path;
1197 int mode;
1198 };
1199 #endif
1200 int
1201 sys_mkfifo(struct thread *td, struct mkfifo_args *uap)
1202 {
1203
1204 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1205 uap->mode));
1206 }
1207
1208 #ifndef _SYS_SYSPROTO_H_
1209 struct mkfifoat_args {
1210 int fd;
1211 char *path;
1212 mode_t mode;
1213 };
1214 #endif
1215 int
1216 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1217 {
1218
1219 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1220 uap->mode));
1221 }
1222
1223 int
1224 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1225 int mode)
1226 {
1227 struct mount *mp;
1228 struct vattr vattr;
1229 struct nameidata nd;
1230 cap_rights_t rights;
1231 int error;
1232
1233 AUDIT_ARG_MODE(mode);
1234 restart:
1235 bwillwrite();
1236 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1237 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKFIFOAT),
1238 td);
1239 if ((error = namei(&nd)) != 0)
1240 return (error);
1241 if (nd.ni_vp != NULL) {
1242 NDFREE(&nd, NDF_ONLY_PNBUF);
1243 if (nd.ni_vp == nd.ni_dvp)
1244 vrele(nd.ni_dvp);
1245 else
1246 vput(nd.ni_dvp);
1247 vrele(nd.ni_vp);
1248 return (EEXIST);
1249 }
1250 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1251 NDFREE(&nd, NDF_ONLY_PNBUF);
1252 vput(nd.ni_dvp);
1253 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1254 return (error);
1255 goto restart;
1256 }
1257 VATTR_NULL(&vattr);
1258 vattr.va_type = VFIFO;
1259 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1260 #ifdef MAC
1261 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1262 &vattr);
1263 if (error != 0)
1264 goto out;
1265 #endif
1266 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1267 if (error == 0)
1268 vput(nd.ni_vp);
1269 #ifdef MAC
1270 out:
1271 #endif
1272 vput(nd.ni_dvp);
1273 vn_finished_write(mp);
1274 NDFREE(&nd, NDF_ONLY_PNBUF);
1275 return (error);
1276 }
1277
1278 /*
1279 * Make a hard file link.
1280 */
1281 #ifndef _SYS_SYSPROTO_H_
1282 struct link_args {
1283 char *path;
1284 char *link;
1285 };
1286 #endif
1287 int
1288 sys_link(struct thread *td, struct link_args *uap)
1289 {
1290
1291 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
1292 UIO_USERSPACE, FOLLOW));
1293 }
1294
1295 #ifndef _SYS_SYSPROTO_H_
1296 struct linkat_args {
1297 int fd1;
1298 char *path1;
1299 int fd2;
1300 char *path2;
1301 int flag;
1302 };
1303 #endif
1304 int
1305 sys_linkat(struct thread *td, struct linkat_args *uap)
1306 {
1307 int flag;
1308
1309 flag = uap->flag;
1310 if (flag & ~AT_SYMLINK_FOLLOW)
1311 return (EINVAL);
1312
1313 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1314 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1315 }
1316
1317 int hardlink_check_uid = 0;
1318 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1319 &hardlink_check_uid, 0,
1320 "Unprivileged processes cannot create hard links to files owned by other "
1321 "users");
1322 static int hardlink_check_gid = 0;
1323 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1324 &hardlink_check_gid, 0,
1325 "Unprivileged processes cannot create hard links to files owned by other "
1326 "groups");
1327
1328 static int
1329 can_hardlink(struct vnode *vp, struct ucred *cred)
1330 {
1331 struct vattr va;
1332 int error;
1333
1334 if (!hardlink_check_uid && !hardlink_check_gid)
1335 return (0);
1336
1337 error = VOP_GETATTR(vp, &va, cred);
1338 if (error != 0)
1339 return (error);
1340
1341 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1342 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1343 if (error != 0)
1344 return (error);
1345 }
1346
1347 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1348 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1349 if (error != 0)
1350 return (error);
1351 }
1352
1353 return (0);
1354 }
1355
1356 int
1357 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1358 enum uio_seg segflg, int follow)
1359 {
1360 struct vnode *vp;
1361 struct mount *mp;
1362 struct nameidata nd;
1363 cap_rights_t rights;
1364 int error;
1365
1366 again:
1367 bwillwrite();
1368 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1,
1369 cap_rights_init(&rights, CAP_LINKAT_SOURCE), td);
1370
1371 if ((error = namei(&nd)) != 0)
1372 return (error);
1373 NDFREE(&nd, NDF_ONLY_PNBUF);
1374 vp = nd.ni_vp;
1375 if (vp->v_type == VDIR) {
1376 vrele(vp);
1377 return (EPERM); /* POSIX */
1378 }
1379 NDINIT_ATRIGHTS(&nd, CREATE,
1380 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflg, path2, fd2,
1381 cap_rights_init(&rights, CAP_LINKAT_TARGET), td);
1382 if ((error = namei(&nd)) == 0) {
1383 if (nd.ni_vp != NULL) {
1384 NDFREE(&nd, NDF_ONLY_PNBUF);
1385 if (nd.ni_dvp == nd.ni_vp)
1386 vrele(nd.ni_dvp);
1387 else
1388 vput(nd.ni_dvp);
1389 vrele(nd.ni_vp);
1390 vrele(vp);
1391 return (EEXIST);
1392 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1393 /*
1394 * Cross-device link. No need to recheck
1395 * vp->v_type, since it cannot change, except
1396 * to VBAD.
1397 */
1398 NDFREE(&nd, NDF_ONLY_PNBUF);
1399 vput(nd.ni_dvp);
1400 vrele(vp);
1401 return (EXDEV);
1402 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
1403 error = can_hardlink(vp, td->td_ucred);
1404 #ifdef MAC
1405 if (error == 0)
1406 error = mac_vnode_check_link(td->td_ucred,
1407 nd.ni_dvp, vp, &nd.ni_cnd);
1408 #endif
1409 if (error != 0) {
1410 vput(vp);
1411 vput(nd.ni_dvp);
1412 NDFREE(&nd, NDF_ONLY_PNBUF);
1413 return (error);
1414 }
1415 error = vn_start_write(vp, &mp, V_NOWAIT);
1416 if (error != 0) {
1417 vput(vp);
1418 vput(nd.ni_dvp);
1419 NDFREE(&nd, NDF_ONLY_PNBUF);
1420 error = vn_start_write(NULL, &mp,
1421 V_XSLEEP | PCATCH);
1422 if (error != 0)
1423 return (error);
1424 goto again;
1425 }
1426 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1427 VOP_UNLOCK(vp, 0);
1428 vput(nd.ni_dvp);
1429 vn_finished_write(mp);
1430 NDFREE(&nd, NDF_ONLY_PNBUF);
1431 } else {
1432 vput(nd.ni_dvp);
1433 NDFREE(&nd, NDF_ONLY_PNBUF);
1434 vrele(vp);
1435 goto again;
1436 }
1437 }
1438 vrele(vp);
1439 return (error);
1440 }
1441
1442 /*
1443 * Make a symbolic link.
1444 */
1445 #ifndef _SYS_SYSPROTO_H_
1446 struct symlink_args {
1447 char *path;
1448 char *link;
1449 };
1450 #endif
1451 int
1452 sys_symlink(struct thread *td, struct symlink_args *uap)
1453 {
1454
1455 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
1456 UIO_USERSPACE));
1457 }
1458
1459 #ifndef _SYS_SYSPROTO_H_
1460 struct symlinkat_args {
1461 char *path;
1462 int fd;
1463 char *path2;
1464 };
1465 #endif
1466 int
1467 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1468 {
1469
1470 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1471 UIO_USERSPACE));
1472 }
1473
1474 int
1475 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1476 enum uio_seg segflg)
1477 {
1478 struct mount *mp;
1479 struct vattr vattr;
1480 char *syspath;
1481 struct nameidata nd;
1482 int error;
1483 cap_rights_t rights;
1484
1485 if (segflg == UIO_SYSSPACE) {
1486 syspath = path1;
1487 } else {
1488 syspath = uma_zalloc(namei_zone, M_WAITOK);
1489 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1490 goto out;
1491 }
1492 AUDIT_ARG_TEXT(syspath);
1493 restart:
1494 bwillwrite();
1495 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1496 NOCACHE, segflg, path2, fd, cap_rights_init(&rights, CAP_SYMLINKAT),
1497 td);
1498 if ((error = namei(&nd)) != 0)
1499 goto out;
1500 if (nd.ni_vp) {
1501 NDFREE(&nd, NDF_ONLY_PNBUF);
1502 if (nd.ni_vp == nd.ni_dvp)
1503 vrele(nd.ni_dvp);
1504 else
1505 vput(nd.ni_dvp);
1506 vrele(nd.ni_vp);
1507 error = EEXIST;
1508 goto out;
1509 }
1510 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1511 NDFREE(&nd, NDF_ONLY_PNBUF);
1512 vput(nd.ni_dvp);
1513 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1514 goto out;
1515 goto restart;
1516 }
1517 VATTR_NULL(&vattr);
1518 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1519 #ifdef MAC
1520 vattr.va_type = VLNK;
1521 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1522 &vattr);
1523 if (error != 0)
1524 goto out2;
1525 #endif
1526 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1527 if (error == 0)
1528 vput(nd.ni_vp);
1529 #ifdef MAC
1530 out2:
1531 #endif
1532 NDFREE(&nd, NDF_ONLY_PNBUF);
1533 vput(nd.ni_dvp);
1534 vn_finished_write(mp);
1535 out:
1536 if (segflg != UIO_SYSSPACE)
1537 uma_zfree(namei_zone, syspath);
1538 return (error);
1539 }
1540
1541 /*
1542 * Delete a whiteout from the filesystem.
1543 */
1544 #ifndef _SYS_SYSPROTO_H_
1545 struct undelete_args {
1546 char *path;
1547 };
1548 #endif
1549 int
1550 sys_undelete(struct thread *td, struct undelete_args *uap)
1551 {
1552 struct mount *mp;
1553 struct nameidata nd;
1554 int error;
1555
1556 restart:
1557 bwillwrite();
1558 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1559 UIO_USERSPACE, uap->path, td);
1560 error = namei(&nd);
1561 if (error != 0)
1562 return (error);
1563
1564 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1565 NDFREE(&nd, NDF_ONLY_PNBUF);
1566 if (nd.ni_vp == nd.ni_dvp)
1567 vrele(nd.ni_dvp);
1568 else
1569 vput(nd.ni_dvp);
1570 if (nd.ni_vp)
1571 vrele(nd.ni_vp);
1572 return (EEXIST);
1573 }
1574 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1575 NDFREE(&nd, NDF_ONLY_PNBUF);
1576 vput(nd.ni_dvp);
1577 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1578 return (error);
1579 goto restart;
1580 }
1581 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1582 NDFREE(&nd, NDF_ONLY_PNBUF);
1583 vput(nd.ni_dvp);
1584 vn_finished_write(mp);
1585 return (error);
1586 }
1587
1588 /*
1589 * Delete a name from the filesystem.
1590 */
1591 #ifndef _SYS_SYSPROTO_H_
1592 struct unlink_args {
1593 char *path;
1594 };
1595 #endif
1596 int
1597 sys_unlink(struct thread *td, struct unlink_args *uap)
1598 {
1599
1600 return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0));
1601 }
1602
1603 #ifndef _SYS_SYSPROTO_H_
1604 struct unlinkat_args {
1605 int fd;
1606 char *path;
1607 int flag;
1608 };
1609 #endif
1610 int
1611 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1612 {
1613 int flag = uap->flag;
1614 int fd = uap->fd;
1615 char *path = uap->path;
1616
1617 if (flag & ~AT_REMOVEDIR)
1618 return (EINVAL);
1619
1620 if (flag & AT_REMOVEDIR)
1621 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1622 else
1623 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0));
1624 }
1625
1626 int
1627 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1628 ino_t oldinum)
1629 {
1630 struct mount *mp;
1631 struct vnode *vp;
1632 struct nameidata nd;
1633 struct stat sb;
1634 cap_rights_t rights;
1635 int error;
1636
1637 restart:
1638 bwillwrite();
1639 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
1640 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
1641 if ((error = namei(&nd)) != 0)
1642 return (error == EINVAL ? EPERM : error);
1643 vp = nd.ni_vp;
1644 if (vp->v_type == VDIR && oldinum == 0) {
1645 error = EPERM; /* POSIX */
1646 } else if (oldinum != 0 &&
1647 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1648 sb.st_ino != oldinum) {
1649 error = EIDRM; /* Identifier removed */
1650 } else {
1651 /*
1652 * The root of a mounted filesystem cannot be deleted.
1653 *
1654 * XXX: can this only be a VDIR case?
1655 */
1656 if (vp->v_vflag & VV_ROOT)
1657 error = EBUSY;
1658 }
1659 if (error == 0) {
1660 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1661 NDFREE(&nd, NDF_ONLY_PNBUF);
1662 vput(nd.ni_dvp);
1663 if (vp == nd.ni_dvp)
1664 vrele(vp);
1665 else
1666 vput(vp);
1667 if ((error = vn_start_write(NULL, &mp,
1668 V_XSLEEP | PCATCH)) != 0)
1669 return (error);
1670 goto restart;
1671 }
1672 #ifdef MAC
1673 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1674 &nd.ni_cnd);
1675 if (error != 0)
1676 goto out;
1677 #endif
1678 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1679 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1680 #ifdef MAC
1681 out:
1682 #endif
1683 vn_finished_write(mp);
1684 }
1685 NDFREE(&nd, NDF_ONLY_PNBUF);
1686 vput(nd.ni_dvp);
1687 if (vp == nd.ni_dvp)
1688 vrele(vp);
1689 else
1690 vput(vp);
1691 return (error);
1692 }
1693
1694 /*
1695 * Reposition read/write file offset.
1696 */
1697 #ifndef _SYS_SYSPROTO_H_
1698 struct lseek_args {
1699 int fd;
1700 int pad;
1701 off_t offset;
1702 int whence;
1703 };
1704 #endif
1705 int
1706 sys_lseek(struct thread *td, struct lseek_args *uap)
1707 {
1708
1709 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1710 }
1711
1712 int
1713 kern_lseek(struct thread *td, int fd, off_t offset, int whence)
1714 {
1715 struct file *fp;
1716 cap_rights_t rights;
1717 int error;
1718
1719 AUDIT_ARG_FD(fd);
1720 error = fget(td, fd, cap_rights_init(&rights, CAP_SEEK), &fp);
1721 if (error != 0)
1722 return (error);
1723 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
1724 fo_seek(fp, offset, whence, td) : ESPIPE;
1725 fdrop(fp, td);
1726 return (error);
1727 }
1728
1729 #if defined(COMPAT_43)
1730 /*
1731 * Reposition read/write file offset.
1732 */
1733 #ifndef _SYS_SYSPROTO_H_
1734 struct olseek_args {
1735 int fd;
1736 long offset;
1737 int whence;
1738 };
1739 #endif
1740 int
1741 olseek(struct thread *td, struct olseek_args *uap)
1742 {
1743
1744 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1745 }
1746 #endif /* COMPAT_43 */
1747
1748 #if defined(COMPAT_FREEBSD6)
1749 /* Version with the 'pad' argument */
1750 int
1751 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap)
1752 {
1753
1754 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1755 }
1756 #endif
1757
1758 /*
1759 * Check access permissions using passed credentials.
1760 */
1761 static int
1762 vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
1763 struct thread *td)
1764 {
1765 accmode_t accmode;
1766 int error;
1767
1768 /* Flags == 0 means only check for existence. */
1769 if (user_flags == 0)
1770 return (0);
1771
1772 accmode = 0;
1773 if (user_flags & R_OK)
1774 accmode |= VREAD;
1775 if (user_flags & W_OK)
1776 accmode |= VWRITE;
1777 if (user_flags & X_OK)
1778 accmode |= VEXEC;
1779 #ifdef MAC
1780 error = mac_vnode_check_access(cred, vp, accmode);
1781 if (error != 0)
1782 return (error);
1783 #endif
1784 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
1785 error = VOP_ACCESS(vp, accmode, cred, td);
1786 return (error);
1787 }
1788
1789 /*
1790 * Check access permissions using "real" credentials.
1791 */
1792 #ifndef _SYS_SYSPROTO_H_
1793 struct access_args {
1794 char *path;
1795 int amode;
1796 };
1797 #endif
1798 int
1799 sys_access(struct thread *td, struct access_args *uap)
1800 {
1801
1802 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1803 0, uap->amode));
1804 }
1805
1806 #ifndef _SYS_SYSPROTO_H_
1807 struct faccessat_args {
1808 int dirfd;
1809 char *path;
1810 int amode;
1811 int flag;
1812 }
1813 #endif
1814 int
1815 sys_faccessat(struct thread *td, struct faccessat_args *uap)
1816 {
1817
1818 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1819 uap->amode));
1820 }
1821
1822 int
1823 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1824 int flag, int amode)
1825 {
1826 struct ucred *cred, *usecred;
1827 struct vnode *vp;
1828 struct nameidata nd;
1829 cap_rights_t rights;
1830 int error;
1831
1832 if (flag & ~AT_EACCESS)
1833 return (EINVAL);
1834 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
1835 return (EINVAL);
1836
1837 /*
1838 * Create and modify a temporary credential instead of one that
1839 * is potentially shared (if we need one).
1840 */
1841 cred = td->td_ucred;
1842 if ((flag & AT_EACCESS) == 0 &&
1843 ((cred->cr_uid != cred->cr_ruid ||
1844 cred->cr_rgid != cred->cr_groups[0]))) {
1845 usecred = crdup(cred);
1846 usecred->cr_uid = cred->cr_ruid;
1847 usecred->cr_groups[0] = cred->cr_rgid;
1848 td->td_ucred = usecred;
1849 } else
1850 usecred = cred;
1851 AUDIT_ARG_VALUE(amode);
1852 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
1853 AUDITVNODE1, pathseg, path, fd, cap_rights_init(&rights, CAP_FSTAT),
1854 td);
1855 if ((error = namei(&nd)) != 0)
1856 goto out;
1857 vp = nd.ni_vp;
1858
1859 error = vn_access(vp, amode, usecred, td);
1860 NDFREE(&nd, NDF_ONLY_PNBUF);
1861 vput(vp);
1862 out:
1863 if (usecred != cred) {
1864 td->td_ucred = cred;
1865 crfree(usecred);
1866 }
1867 return (error);
1868 }
1869
1870 /*
1871 * Check access permissions using "effective" credentials.
1872 */
1873 #ifndef _SYS_SYSPROTO_H_
1874 struct eaccess_args {
1875 char *path;
1876 int amode;
1877 };
1878 #endif
1879 int
1880 sys_eaccess(struct thread *td, struct eaccess_args *uap)
1881 {
1882
1883 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1884 AT_EACCESS, uap->amode));
1885 }
1886
1887 #if defined(COMPAT_43)
1888 /*
1889 * Get file status; this version follows links.
1890 */
1891 #ifndef _SYS_SYSPROTO_H_
1892 struct ostat_args {
1893 char *path;
1894 struct ostat *ub;
1895 };
1896 #endif
1897 int
1898 ostat(struct thread *td, struct ostat_args *uap)
1899 {
1900 struct stat sb;
1901 struct ostat osb;
1902 int error;
1903
1904 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
1905 &sb, NULL);
1906 if (error != 0)
1907 return (error);
1908 cvtstat(&sb, &osb);
1909 return (copyout(&osb, uap->ub, sizeof (osb)));
1910 }
1911
1912 /*
1913 * Get file status; this version does not follow links.
1914 */
1915 #ifndef _SYS_SYSPROTO_H_
1916 struct olstat_args {
1917 char *path;
1918 struct ostat *ub;
1919 };
1920 #endif
1921 int
1922 olstat(struct thread *td, struct olstat_args *uap)
1923 {
1924 struct stat sb;
1925 struct ostat osb;
1926 int error;
1927
1928 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
1929 UIO_USERSPACE, &sb, NULL);
1930 if (error != 0)
1931 return (error);
1932 cvtstat(&sb, &osb);
1933 return (copyout(&osb, uap->ub, sizeof (osb)));
1934 }
1935
1936 /*
1937 * Convert from an old to a new stat structure.
1938 */
1939 void
1940 cvtstat(struct stat *st, struct ostat *ost)
1941 {
1942
1943 bzero(ost, sizeof(*ost));
1944 ost->st_dev = st->st_dev;
1945 ost->st_ino = st->st_ino;
1946 ost->st_mode = st->st_mode;
1947 ost->st_nlink = st->st_nlink;
1948 ost->st_uid = st->st_uid;
1949 ost->st_gid = st->st_gid;
1950 ost->st_rdev = st->st_rdev;
1951 if (st->st_size < (quad_t)1 << 32)
1952 ost->st_size = st->st_size;
1953 else
1954 ost->st_size = -2;
1955 ost->st_atim = st->st_atim;
1956 ost->st_mtim = st->st_mtim;
1957 ost->st_ctim = st->st_ctim;
1958 ost->st_blksize = st->st_blksize;
1959 ost->st_blocks = st->st_blocks;
1960 ost->st_flags = st->st_flags;
1961 ost->st_gen = st->st_gen;
1962 }
1963 #endif /* COMPAT_43 */
1964
1965 /*
1966 * Get file status; this version follows links.
1967 */
1968 #ifndef _SYS_SYSPROTO_H_
1969 struct stat_args {
1970 char *path;
1971 struct stat *ub;
1972 };
1973 #endif
1974 int
1975 sys_stat(struct thread *td, struct stat_args *uap)
1976 {
1977 struct stat sb;
1978 int error;
1979
1980 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
1981 &sb, NULL);
1982 if (error == 0)
1983 error = copyout(&sb, uap->ub, sizeof (sb));
1984 return (error);
1985 }
1986
1987 #ifndef _SYS_SYSPROTO_H_
1988 struct fstatat_args {
1989 int fd;
1990 char *path;
1991 struct stat *buf;
1992 int flag;
1993 }
1994 #endif
1995 int
1996 sys_fstatat(struct thread *td, struct fstatat_args *uap)
1997 {
1998 struct stat sb;
1999 int error;
2000
2001 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2002 UIO_USERSPACE, &sb, NULL);
2003 if (error == 0)
2004 error = copyout(&sb, uap->buf, sizeof (sb));
2005 return (error);
2006 }
2007
2008 int
2009 kern_statat(struct thread *td, int flag, int fd, char *path,
2010 enum uio_seg pathseg, struct stat *sbp,
2011 void (*hook)(struct vnode *vp, struct stat *sbp))
2012 {
2013 struct nameidata nd;
2014 struct stat sb;
2015 cap_rights_t rights;
2016 int error;
2017
2018 if (flag & ~AT_SYMLINK_NOFOLLOW)
2019 return (EINVAL);
2020
2021 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2022 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd,
2023 cap_rights_init(&rights, CAP_FSTAT), td);
2024
2025 if ((error = namei(&nd)) != 0)
2026 return (error);
2027 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2028 if (error == 0) {
2029 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode);
2030 if (S_ISREG(sb.st_mode))
2031 SDT_PROBE2(vfs, , stat, reg, path, pathseg);
2032 if (__predict_false(hook != NULL))
2033 hook(nd.ni_vp, &sb);
2034 }
2035 NDFREE(&nd, NDF_ONLY_PNBUF);
2036 vput(nd.ni_vp);
2037 if (error != 0)
2038 return (error);
2039 *sbp = sb;
2040 #ifdef KTRACE
2041 if (KTRPOINT(td, KTR_STRUCT))
2042 ktrstat(&sb);
2043 #endif
2044 return (0);
2045 }
2046
2047 /*
2048 * Get file status; this version does not follow links.
2049 */
2050 #ifndef _SYS_SYSPROTO_H_
2051 struct lstat_args {
2052 char *path;
2053 struct stat *ub;
2054 };
2055 #endif
2056 int
2057 sys_lstat(struct thread *td, struct lstat_args *uap)
2058 {
2059 struct stat sb;
2060 int error;
2061
2062 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2063 UIO_USERSPACE, &sb, NULL);
2064 if (error == 0)
2065 error = copyout(&sb, uap->ub, sizeof (sb));
2066 return (error);
2067 }
2068
2069 /*
2070 * Implementation of the NetBSD [l]stat() functions.
2071 */
2072 void
2073 cvtnstat( struct stat *sb, struct nstat *nsb)
2074 {
2075
2076 bzero(nsb, sizeof *nsb);
2077 nsb->st_dev = sb->st_dev;
2078 nsb->st_ino = sb->st_ino;
2079 nsb->st_mode = sb->st_mode;
2080 nsb->st_nlink = sb->st_nlink;
2081 nsb->st_uid = sb->st_uid;
2082 nsb->st_gid = sb->st_gid;
2083 nsb->st_rdev = sb->st_rdev;
2084 nsb->st_atim = sb->st_atim;
2085 nsb->st_mtim = sb->st_mtim;
2086 nsb->st_ctim = sb->st_ctim;
2087 nsb->st_size = sb->st_size;
2088 nsb->st_blocks = sb->st_blocks;
2089 nsb->st_blksize = sb->st_blksize;
2090 nsb->st_flags = sb->st_flags;
2091 nsb->st_gen = sb->st_gen;
2092 nsb->st_birthtim = sb->st_birthtim;
2093 }
2094
2095 #ifndef _SYS_SYSPROTO_H_
2096 struct nstat_args {
2097 char *path;
2098 struct nstat *ub;
2099 };
2100 #endif
2101 int
2102 sys_nstat(struct thread *td, struct nstat_args *uap)
2103 {
2104 struct stat sb;
2105 struct nstat nsb;
2106 int error;
2107
2108 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2109 &sb, NULL);
2110 if (error != 0)
2111 return (error);
2112 cvtnstat(&sb, &nsb);
2113 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2114 }
2115
2116 /*
2117 * NetBSD lstat. Get file status; this version does not follow links.
2118 */
2119 #ifndef _SYS_SYSPROTO_H_
2120 struct lstat_args {
2121 char *path;
2122 struct stat *ub;
2123 };
2124 #endif
2125 int
2126 sys_nlstat(struct thread *td, struct nlstat_args *uap)
2127 {
2128 struct stat sb;
2129 struct nstat nsb;
2130 int error;
2131
2132 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2133 UIO_USERSPACE, &sb, NULL);
2134 if (error != 0)
2135 return (error);
2136 cvtnstat(&sb, &nsb);
2137 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2138 }
2139
2140 /*
2141 * Get configurable pathname variables.
2142 */
2143 #ifndef _SYS_SYSPROTO_H_
2144 struct pathconf_args {
2145 char *path;
2146 int name;
2147 };
2148 #endif
2149 int
2150 sys_pathconf(struct thread *td, struct pathconf_args *uap)
2151 {
2152
2153 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW));
2154 }
2155
2156 #ifndef _SYS_SYSPROTO_H_
2157 struct lpathconf_args {
2158 char *path;
2159 int name;
2160 };
2161 #endif
2162 int
2163 sys_lpathconf(struct thread *td, struct lpathconf_args *uap)
2164 {
2165
2166 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2167 NOFOLLOW));
2168 }
2169
2170 int
2171 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2172 u_long flags)
2173 {
2174 struct nameidata nd;
2175 int error;
2176
2177 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2178 pathseg, path, td);
2179 if ((error = namei(&nd)) != 0)
2180 return (error);
2181 NDFREE(&nd, NDF_ONLY_PNBUF);
2182
2183 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
2184 vput(nd.ni_vp);
2185 return (error);
2186 }
2187
2188 /*
2189 * Return target name of a symbolic link.
2190 */
2191 #ifndef _SYS_SYSPROTO_H_
2192 struct readlink_args {
2193 char *path;
2194 char *buf;
2195 size_t count;
2196 };
2197 #endif
2198 int
2199 sys_readlink(struct thread *td, struct readlink_args *uap)
2200 {
2201
2202 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2203 uap->buf, UIO_USERSPACE, uap->count));
2204 }
2205 #ifndef _SYS_SYSPROTO_H_
2206 struct readlinkat_args {
2207 int fd;
2208 char *path;
2209 char *buf;
2210 size_t bufsize;
2211 };
2212 #endif
2213 int
2214 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2215 {
2216
2217 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2218 uap->buf, UIO_USERSPACE, uap->bufsize));
2219 }
2220
2221 int
2222 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2223 char *buf, enum uio_seg bufseg, size_t count)
2224 {
2225 struct vnode *vp;
2226 struct iovec aiov;
2227 struct uio auio;
2228 struct nameidata nd;
2229 int error;
2230
2231 if (count > IOSIZE_MAX)
2232 return (EINVAL);
2233
2234 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
2235 pathseg, path, fd, td);
2236
2237 if ((error = namei(&nd)) != 0)
2238 return (error);
2239 NDFREE(&nd, NDF_ONLY_PNBUF);
2240 vp = nd.ni_vp;
2241 #ifdef MAC
2242 error = mac_vnode_check_readlink(td->td_ucred, vp);
2243 if (error != 0) {
2244 vput(vp);
2245 return (error);
2246 }
2247 #endif
2248 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0)
2249 error = EINVAL;
2250 else {
2251 aiov.iov_base = buf;
2252 aiov.iov_len = count;
2253 auio.uio_iov = &aiov;
2254 auio.uio_iovcnt = 1;
2255 auio.uio_offset = 0;
2256 auio.uio_rw = UIO_READ;
2257 auio.uio_segflg = bufseg;
2258 auio.uio_td = td;
2259 auio.uio_resid = count;
2260 error = VOP_READLINK(vp, &auio, td->td_ucred);
2261 td->td_retval[0] = count - auio.uio_resid;
2262 }
2263 vput(vp);
2264 return (error);
2265 }
2266
2267 /*
2268 * Common implementation code for chflags() and fchflags().
2269 */
2270 static int
2271 setfflags(struct thread *td, struct vnode *vp, u_long flags)
2272 {
2273 struct mount *mp;
2274 struct vattr vattr;
2275 int error;
2276
2277 /* We can't support the value matching VNOVAL. */
2278 if (flags == VNOVAL)
2279 return (EOPNOTSUPP);
2280
2281 /*
2282 * Prevent non-root users from setting flags on devices. When
2283 * a device is reused, users can retain ownership of the device
2284 * if they are allowed to set flags and programs assume that
2285 * chown can't fail when done as root.
2286 */
2287 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2288 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2289 if (error != 0)
2290 return (error);
2291 }
2292
2293 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2294 return (error);
2295 VATTR_NULL(&vattr);
2296 vattr.va_flags = flags;
2297 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2298 #ifdef MAC
2299 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2300 if (error == 0)
2301 #endif
2302 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2303 VOP_UNLOCK(vp, 0);
2304 vn_finished_write(mp);
2305 return (error);
2306 }
2307
2308 /*
2309 * Change flags of a file given a path name.
2310 */
2311 #ifndef _SYS_SYSPROTO_H_
2312 struct chflags_args {
2313 const char *path;
2314 u_long flags;
2315 };
2316 #endif
2317 int
2318 sys_chflags(struct thread *td, struct chflags_args *uap)
2319 {
2320
2321 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2322 uap->flags, 0));
2323 }
2324
2325 #ifndef _SYS_SYSPROTO_H_
2326 struct chflagsat_args {
2327 int fd;
2328 const char *path;
2329 u_long flags;
2330 int atflag;
2331 }
2332 #endif
2333 int
2334 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2335 {
2336 int fd = uap->fd;
2337 const char *path = uap->path;
2338 u_long flags = uap->flags;
2339 int atflag = uap->atflag;
2340
2341 if (atflag & ~AT_SYMLINK_NOFOLLOW)
2342 return (EINVAL);
2343
2344 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag));
2345 }
2346
2347 /*
2348 * Same as chflags() but doesn't follow symlinks.
2349 */
2350 #ifndef _SYS_SYSPROTO_H_
2351 struct lchflags_args {
2352 const char *path;
2353 u_long flags;
2354 };
2355 #endif
2356 int
2357 sys_lchflags(struct thread *td, struct lchflags_args *uap)
2358 {
2359
2360 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2361 uap->flags, AT_SYMLINK_NOFOLLOW));
2362 }
2363
2364 static int
2365 kern_chflagsat(struct thread *td, int fd, const char *path,
2366 enum uio_seg pathseg, u_long flags, int atflag)
2367 {
2368 struct nameidata nd;
2369 cap_rights_t rights;
2370 int error, follow;
2371
2372 AUDIT_ARG_FFLAGS(flags);
2373 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2374 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2375 cap_rights_init(&rights, CAP_FCHFLAGS), td);
2376 if ((error = namei(&nd)) != 0)
2377 return (error);
2378 NDFREE(&nd, NDF_ONLY_PNBUF);
2379 error = setfflags(td, nd.ni_vp, flags);
2380 vrele(nd.ni_vp);
2381 return (error);
2382 }
2383
2384 /*
2385 * Change flags of a file given a file descriptor.
2386 */
2387 #ifndef _SYS_SYSPROTO_H_
2388 struct fchflags_args {
2389 int fd;
2390 u_long flags;
2391 };
2392 #endif
2393 int
2394 sys_fchflags(struct thread *td, struct fchflags_args *uap)
2395 {
2396 struct file *fp;
2397 cap_rights_t rights;
2398 int error;
2399
2400 AUDIT_ARG_FD(uap->fd);
2401 AUDIT_ARG_FFLAGS(uap->flags);
2402 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHFLAGS),
2403 &fp);
2404 if (error != 0)
2405 return (error);
2406 #ifdef AUDIT
2407 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2408 AUDIT_ARG_VNODE1(fp->f_vnode);
2409 VOP_UNLOCK(fp->f_vnode, 0);
2410 #endif
2411 error = setfflags(td, fp->f_vnode, uap->flags);
2412 fdrop(fp, td);
2413 return (error);
2414 }
2415
2416 /*
2417 * Common implementation code for chmod(), lchmod() and fchmod().
2418 */
2419 int
2420 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode)
2421 {
2422 struct mount *mp;
2423 struct vattr vattr;
2424 int error;
2425
2426 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2427 return (error);
2428 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2429 VATTR_NULL(&vattr);
2430 vattr.va_mode = mode & ALLPERMS;
2431 #ifdef MAC
2432 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2433 if (error == 0)
2434 #endif
2435 error = VOP_SETATTR(vp, &vattr, cred);
2436 VOP_UNLOCK(vp, 0);
2437 vn_finished_write(mp);
2438 return (error);
2439 }
2440
2441 /*
2442 * Change mode of a file given path name.
2443 */
2444 #ifndef _SYS_SYSPROTO_H_
2445 struct chmod_args {
2446 char *path;
2447 int mode;
2448 };
2449 #endif
2450 int
2451 sys_chmod(struct thread *td, struct chmod_args *uap)
2452 {
2453
2454 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2455 uap->mode, 0));
2456 }
2457
2458 #ifndef _SYS_SYSPROTO_H_
2459 struct fchmodat_args {
2460 int dirfd;
2461 char *path;
2462 mode_t mode;
2463 int flag;
2464 }
2465 #endif
2466 int
2467 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2468 {
2469 int flag = uap->flag;
2470 int fd = uap->fd;
2471 char *path = uap->path;
2472 mode_t mode = uap->mode;
2473
2474 if (flag & ~AT_SYMLINK_NOFOLLOW)
2475 return (EINVAL);
2476
2477 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2478 }
2479
2480 /*
2481 * Change mode of a file given path name (don't follow links.)
2482 */
2483 #ifndef _SYS_SYSPROTO_H_
2484 struct lchmod_args {
2485 char *path;
2486 int mode;
2487 };
2488 #endif
2489 int
2490 sys_lchmod(struct thread *td, struct lchmod_args *uap)
2491 {
2492
2493 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2494 uap->mode, AT_SYMLINK_NOFOLLOW));
2495 }
2496
2497 int
2498 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2499 mode_t mode, int flag)
2500 {
2501 struct nameidata nd;
2502 cap_rights_t rights;
2503 int error, follow;
2504
2505 AUDIT_ARG_MODE(mode);
2506 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2507 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2508 cap_rights_init(&rights, CAP_FCHMOD), td);
2509 if ((error = namei(&nd)) != 0)
2510 return (error);
2511 NDFREE(&nd, NDF_ONLY_PNBUF);
2512 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2513 vrele(nd.ni_vp);
2514 return (error);
2515 }
2516
2517 /*
2518 * Change mode of a file given a file descriptor.
2519 */
2520 #ifndef _SYS_SYSPROTO_H_
2521 struct fchmod_args {
2522 int fd;
2523 int mode;
2524 };
2525 #endif
2526 int
2527 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2528 {
2529 struct file *fp;
2530 cap_rights_t rights;
2531 int error;
2532
2533 AUDIT_ARG_FD(uap->fd);
2534 AUDIT_ARG_MODE(uap->mode);
2535
2536 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHMOD), &fp);
2537 if (error != 0)
2538 return (error);
2539 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2540 fdrop(fp, td);
2541 return (error);
2542 }
2543
2544 /*
2545 * Common implementation for chown(), lchown(), and fchown()
2546 */
2547 int
2548 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
2549 gid_t gid)
2550 {
2551 struct mount *mp;
2552 struct vattr vattr;
2553 int error;
2554
2555 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2556 return (error);
2557 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2558 VATTR_NULL(&vattr);
2559 vattr.va_uid = uid;
2560 vattr.va_gid = gid;
2561 #ifdef MAC
2562 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
2563 vattr.va_gid);
2564 if (error == 0)
2565 #endif
2566 error = VOP_SETATTR(vp, &vattr, cred);
2567 VOP_UNLOCK(vp, 0);
2568 vn_finished_write(mp);
2569 return (error);
2570 }
2571
2572 /*
2573 * Set ownership given a path name.
2574 */
2575 #ifndef _SYS_SYSPROTO_H_
2576 struct chown_args {
2577 char *path;
2578 int uid;
2579 int gid;
2580 };
2581 #endif
2582 int
2583 sys_chown(struct thread *td, struct chown_args *uap)
2584 {
2585
2586 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid,
2587 uap->gid, 0));
2588 }
2589
2590 #ifndef _SYS_SYSPROTO_H_
2591 struct fchownat_args {
2592 int fd;
2593 const char * path;
2594 uid_t uid;
2595 gid_t gid;
2596 int flag;
2597 };
2598 #endif
2599 int
2600 sys_fchownat(struct thread *td, struct fchownat_args *uap)
2601 {
2602 int flag;
2603
2604 flag = uap->flag;
2605 if (flag & ~AT_SYMLINK_NOFOLLOW)
2606 return (EINVAL);
2607
2608 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
2609 uap->gid, uap->flag));
2610 }
2611
2612 int
2613 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2614 int uid, int gid, int flag)
2615 {
2616 struct nameidata nd;
2617 cap_rights_t rights;
2618 int error, follow;
2619
2620 AUDIT_ARG_OWNER(uid, gid);
2621 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2622 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2623 cap_rights_init(&rights, CAP_FCHOWN), td);
2624
2625 if ((error = namei(&nd)) != 0)
2626 return (error);
2627 NDFREE(&nd, NDF_ONLY_PNBUF);
2628 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
2629 vrele(nd.ni_vp);
2630 return (error);
2631 }
2632
2633 /*
2634 * Set ownership given a path name, do not cross symlinks.
2635 */
2636 #ifndef _SYS_SYSPROTO_H_
2637 struct lchown_args {
2638 char *path;
2639 int uid;
2640 int gid;
2641 };
2642 #endif
2643 int
2644 sys_lchown(struct thread *td, struct lchown_args *uap)
2645 {
2646
2647 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2648 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
2649 }
2650
2651 /*
2652 * Set ownership given a file descriptor.
2653 */
2654 #ifndef _SYS_SYSPROTO_H_
2655 struct fchown_args {
2656 int fd;
2657 int uid;
2658 int gid;
2659 };
2660 #endif
2661 int
2662 sys_fchown(struct thread *td, struct fchown_args *uap)
2663 {
2664 struct file *fp;
2665 cap_rights_t rights;
2666 int error;
2667
2668 AUDIT_ARG_FD(uap->fd);
2669 AUDIT_ARG_OWNER(uap->uid, uap->gid);
2670 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHOWN), &fp);
2671 if (error != 0)
2672 return (error);
2673 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
2674 fdrop(fp, td);
2675 return (error);
2676 }
2677
2678 /*
2679 * Common implementation code for utimes(), lutimes(), and futimes().
2680 */
2681 static int
2682 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg,
2683 struct timespec *tsp)
2684 {
2685 struct timeval tv[2];
2686 const struct timeval *tvp;
2687 int error;
2688
2689 if (usrtvp == NULL) {
2690 vfs_timestamp(&tsp[0]);
2691 tsp[1] = tsp[0];
2692 } else {
2693 if (tvpseg == UIO_SYSSPACE) {
2694 tvp = usrtvp;
2695 } else {
2696 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
2697 return (error);
2698 tvp = tv;
2699 }
2700
2701 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
2702 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
2703 return (EINVAL);
2704 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
2705 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
2706 }
2707 return (0);
2708 }
2709
2710 /*
2711 * Common implementation code for futimens(), utimensat().
2712 */
2713 #define UTIMENS_NULL 0x1
2714 #define UTIMENS_EXIT 0x2
2715 static int
2716 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
2717 struct timespec *tsp, int *retflags)
2718 {
2719 struct timespec tsnow;
2720 int error;
2721
2722 vfs_timestamp(&tsnow);
2723 *retflags = 0;
2724 if (usrtsp == NULL) {
2725 tsp[0] = tsnow;
2726 tsp[1] = tsnow;
2727 *retflags |= UTIMENS_NULL;
2728 return (0);
2729 }
2730 if (tspseg == UIO_SYSSPACE) {
2731 tsp[0] = usrtsp[0];
2732 tsp[1] = usrtsp[1];
2733 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
2734 return (error);
2735 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
2736 *retflags |= UTIMENS_EXIT;
2737 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
2738 *retflags |= UTIMENS_NULL;
2739 if (tsp[0].tv_nsec == UTIME_OMIT)
2740 tsp[0].tv_sec = VNOVAL;
2741 else if (tsp[0].tv_nsec == UTIME_NOW)
2742 tsp[0] = tsnow;
2743 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
2744 return (EINVAL);
2745 if (tsp[1].tv_nsec == UTIME_OMIT)
2746 tsp[1].tv_sec = VNOVAL;
2747 else if (tsp[1].tv_nsec == UTIME_NOW)
2748 tsp[1] = tsnow;
2749 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
2750 return (EINVAL);
2751
2752 return (0);
2753 }
2754
2755 /*
2756 * Common implementation code for utimes(), lutimes(), futimes(), futimens(),
2757 * and utimensat().
2758 */
2759 static int
2760 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts,
2761 int numtimes, int nullflag)
2762 {
2763 struct mount *mp;
2764 struct vattr vattr;
2765 int error, setbirthtime;
2766
2767 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2768 return (error);
2769 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2770 setbirthtime = 0;
2771 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
2772 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
2773 setbirthtime = 1;
2774 VATTR_NULL(&vattr);
2775 vattr.va_atime = ts[0];
2776 vattr.va_mtime = ts[1];
2777 if (setbirthtime)
2778 vattr.va_birthtime = ts[1];
2779 if (numtimes > 2)
2780 vattr.va_birthtime = ts[2];
2781 if (nullflag)
2782 vattr.va_vaflags |= VA_UTIMES_NULL;
2783 #ifdef MAC
2784 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
2785 vattr.va_mtime);
2786 #endif
2787 if (error == 0)
2788 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2789 VOP_UNLOCK(vp, 0);
2790 vn_finished_write(mp);
2791 return (error);
2792 }
2793
2794 /*
2795 * Set the access and modification times of a file.
2796 */
2797 #ifndef _SYS_SYSPROTO_H_
2798 struct utimes_args {
2799 char *path;
2800 struct timeval *tptr;
2801 };
2802 #endif
2803 int
2804 sys_utimes(struct thread *td, struct utimes_args *uap)
2805 {
2806
2807 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2808 uap->tptr, UIO_USERSPACE));
2809 }
2810
2811 #ifndef _SYS_SYSPROTO_H_
2812 struct futimesat_args {
2813 int fd;
2814 const char * path;
2815 const struct timeval * times;
2816 };
2817 #endif
2818 int
2819 sys_futimesat(struct thread *td, struct futimesat_args *uap)
2820 {
2821
2822 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
2823 uap->times, UIO_USERSPACE));
2824 }
2825
2826 int
2827 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2828 struct timeval *tptr, enum uio_seg tptrseg)
2829 {
2830 struct nameidata nd;
2831 struct timespec ts[2];
2832 cap_rights_t rights;
2833 int error;
2834
2835 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
2836 return (error);
2837 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
2838 cap_rights_init(&rights, CAP_FUTIMES), td);
2839
2840 if ((error = namei(&nd)) != 0)
2841 return (error);
2842 NDFREE(&nd, NDF_ONLY_PNBUF);
2843 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
2844 vrele(nd.ni_vp);
2845 return (error);
2846 }
2847
2848 /*
2849 * Set the access and modification times of a file.
2850 */
2851 #ifndef _SYS_SYSPROTO_H_
2852 struct lutimes_args {
2853 char *path;
2854 struct timeval *tptr;
2855 };
2856 #endif
2857 int
2858 sys_lutimes(struct thread *td, struct lutimes_args *uap)
2859 {
2860
2861 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
2862 UIO_USERSPACE));
2863 }
2864
2865 int
2866 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
2867 struct timeval *tptr, enum uio_seg tptrseg)
2868 {
2869 struct timespec ts[2];
2870 struct nameidata nd;
2871 int error;
2872
2873 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
2874 return (error);
2875 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
2876 if ((error = namei(&nd)) != 0)
2877 return (error);
2878 NDFREE(&nd, NDF_ONLY_PNBUF);
2879 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
2880 vrele(nd.ni_vp);
2881 return (error);
2882 }
2883
2884 /*
2885 * Set the access and modification times of a file.
2886 */
2887 #ifndef _SYS_SYSPROTO_H_
2888 struct futimes_args {
2889 int fd;
2890 struct timeval *tptr;
2891 };
2892 #endif
2893 int
2894 sys_futimes(struct thread *td, struct futimes_args *uap)
2895 {
2896
2897 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
2898 }
2899
2900 int
2901 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
2902 enum uio_seg tptrseg)
2903 {
2904 struct timespec ts[2];
2905 struct file *fp;
2906 cap_rights_t rights;
2907 int error;
2908
2909 AUDIT_ARG_FD(fd);
2910 error = getutimes(tptr, tptrseg, ts);
2911 if (error != 0)
2912 return (error);
2913 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FUTIMES), &fp);
2914 if (error != 0)
2915 return (error);
2916 #ifdef AUDIT
2917 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2918 AUDIT_ARG_VNODE1(fp->f_vnode);
2919 VOP_UNLOCK(fp->f_vnode, 0);
2920 #endif
2921 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
2922 fdrop(fp, td);
2923 return (error);
2924 }
2925
2926 int
2927 sys_futimens(struct thread *td, struct futimens_args *uap)
2928 {
2929
2930 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
2931 }
2932
2933 int
2934 kern_futimens(struct thread *td, int fd, struct timespec *tptr,
2935 enum uio_seg tptrseg)
2936 {
2937 struct timespec ts[2];
2938 struct file *fp;
2939 cap_rights_t rights;
2940 int error, flags;
2941
2942 AUDIT_ARG_FD(fd);
2943 error = getutimens(tptr, tptrseg, ts, &flags);
2944 if (error != 0)
2945 return (error);
2946 if (flags & UTIMENS_EXIT)
2947 return (0);
2948 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FUTIMES), &fp);
2949 if (error != 0)
2950 return (error);
2951 #ifdef AUDIT
2952 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2953 AUDIT_ARG_VNODE1(fp->f_vnode);
2954 VOP_UNLOCK(fp->f_vnode, 0);
2955 #endif
2956 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
2957 fdrop(fp, td);
2958 return (error);
2959 }
2960
2961 int
2962 sys_utimensat(struct thread *td, struct utimensat_args *uap)
2963 {
2964
2965 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
2966 uap->times, UIO_USERSPACE, uap->flag));
2967 }
2968
2969 int
2970 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2971 struct timespec *tptr, enum uio_seg tptrseg, int flag)
2972 {
2973 struct nameidata nd;
2974 struct timespec ts[2];
2975 cap_rights_t rights;
2976 int error, flags;
2977
2978 if (flag & ~AT_SYMLINK_NOFOLLOW)
2979 return (EINVAL);
2980
2981 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
2982 return (error);
2983 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2984 FOLLOW) | AUDITVNODE1, pathseg, path, fd,
2985 cap_rights_init(&rights, CAP_FUTIMES), td);
2986 if ((error = namei(&nd)) != 0)
2987 return (error);
2988 /*
2989 * We are allowed to call namei() regardless of 2xUTIME_OMIT.
2990 * POSIX states:
2991 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
2992 * "Search permission is denied by a component of the path prefix."
2993 */
2994 NDFREE(&nd, NDF_ONLY_PNBUF);
2995 if ((flags & UTIMENS_EXIT) == 0)
2996 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
2997 vrele(nd.ni_vp);
2998 return (error);
2999 }
3000
3001 /*
3002 * Truncate a file given its path name.
3003 */
3004 #ifndef _SYS_SYSPROTO_H_
3005 struct truncate_args {
3006 char *path;
3007 int pad;
3008 off_t length;
3009 };
3010 #endif
3011 int
3012 sys_truncate(struct thread *td, struct truncate_args *uap)
3013 {
3014
3015 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3016 }
3017
3018 int
3019 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3020 {
3021 struct mount *mp;
3022 struct vnode *vp;
3023 void *rl_cookie;
3024 struct vattr vattr;
3025 struct nameidata nd;
3026 int error;
3027
3028 if (length < 0)
3029 return(EINVAL);
3030 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
3031 if ((error = namei(&nd)) != 0)
3032 return (error);
3033 vp = nd.ni_vp;
3034 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3035 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3036 vn_rangelock_unlock(vp, rl_cookie);
3037 vrele(vp);
3038 return (error);
3039 }
3040 NDFREE(&nd, NDF_ONLY_PNBUF);
3041 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3042 if (vp->v_type == VDIR)
3043 error = EISDIR;
3044 #ifdef MAC
3045 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3046 }
3047 #endif
3048 else if ((error = vn_writechk(vp)) == 0 &&
3049 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3050 VATTR_NULL(&vattr);
3051 vattr.va_size = length;
3052 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3053 }
3054 VOP_UNLOCK(vp, 0);
3055 vn_finished_write(mp);
3056 vn_rangelock_unlock(vp, rl_cookie);
3057 vrele(vp);
3058 return (error);
3059 }
3060
3061 #if defined(COMPAT_43)
3062 /*
3063 * Truncate a file given its path name.
3064 */
3065 #ifndef _SYS_SYSPROTO_H_
3066 struct otruncate_args {
3067 char *path;
3068 long length;
3069 };
3070 #endif
3071 int
3072 otruncate(struct thread *td, struct otruncate_args *uap)
3073 {
3074
3075 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3076 }
3077 #endif /* COMPAT_43 */
3078
3079 #if defined(COMPAT_FREEBSD6)
3080 /* Versions with the pad argument */
3081 int
3082 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3083 {
3084
3085 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3086 }
3087
3088 int
3089 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3090 {
3091
3092 return (kern_ftruncate(td, uap->fd, uap->length));
3093 }
3094 #endif
3095
3096 int
3097 kern_fsync(struct thread *td, int fd, bool fullsync)
3098 {
3099 struct vnode *vp;
3100 struct mount *mp;
3101 struct file *fp;
3102 cap_rights_t rights;
3103 int error, lock_flags;
3104
3105 AUDIT_ARG_FD(fd);
3106 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSYNC), &fp);
3107 if (error != 0)
3108 return (error);
3109 vp = fp->f_vnode;
3110 #if 0
3111 if (!fullsync)
3112 /* XXXKIB: compete outstanding aio writes */;
3113 #endif
3114 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3115 if (error != 0)
3116 goto drop;
3117 if (MNT_SHARED_WRITES(mp) ||
3118 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3119 lock_flags = LK_SHARED;
3120 } else {
3121 lock_flags = LK_EXCLUSIVE;
3122 }
3123 vn_lock(vp, lock_flags | LK_RETRY);
3124 AUDIT_ARG_VNODE1(vp);
3125 if (vp->v_object != NULL) {
3126 VM_OBJECT_WLOCK(vp->v_object);
3127 vm_object_page_clean(vp->v_object, 0, 0, 0);
3128 VM_OBJECT_WUNLOCK(vp->v_object);
3129 }
3130 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td);
3131 VOP_UNLOCK(vp, 0);
3132 vn_finished_write(mp);
3133 drop:
3134 fdrop(fp, td);
3135 return (error);
3136 }
3137
3138 /*
3139 * Sync an open file.
3140 */
3141 #ifndef _SYS_SYSPROTO_H_
3142 struct fsync_args {
3143 int fd;
3144 };
3145 #endif
3146 int
3147 sys_fsync(struct thread *td, struct fsync_args *uap)
3148 {
3149
3150 return (kern_fsync(td, uap->fd, true));
3151 }
3152
3153 int
3154 sys_fdatasync(struct thread *td, struct fdatasync_args *uap)
3155 {
3156
3157 return (kern_fsync(td, uap->fd, false));
3158 }
3159
3160 /*
3161 * Rename files. Source and destination must either both be directories, or
3162 * both not be directories. If target is a directory, it must be empty.
3163 */
3164 #ifndef _SYS_SYSPROTO_H_
3165 struct rename_args {
3166 char *from;
3167 char *to;
3168 };
3169 #endif
3170 int
3171 sys_rename(struct thread *td, struct rename_args *uap)
3172 {
3173
3174 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
3175 uap->to, UIO_USERSPACE));
3176 }
3177
3178 #ifndef _SYS_SYSPROTO_H_
3179 struct renameat_args {
3180 int oldfd;
3181 char *old;
3182 int newfd;
3183 char *new;
3184 };
3185 #endif
3186 int
3187 sys_renameat(struct thread *td, struct renameat_args *uap)
3188 {
3189
3190 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3191 UIO_USERSPACE));
3192 }
3193
3194 int
3195 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3196 enum uio_seg pathseg)
3197 {
3198 struct mount *mp = NULL;
3199 struct vnode *tvp, *fvp, *tdvp;
3200 struct nameidata fromnd, tond;
3201 cap_rights_t rights;
3202 int error;
3203
3204 again:
3205 bwillwrite();
3206 #ifdef MAC
3207 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3208 AUDITVNODE1, pathseg, old, oldfd,
3209 cap_rights_init(&rights, CAP_RENAMEAT_SOURCE), td);
3210 #else
3211 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
3212 pathseg, old, oldfd,
3213 cap_rights_init(&rights, CAP_RENAMEAT_SOURCE), td);
3214 #endif
3215
3216 if ((error = namei(&fromnd)) != 0)
3217 return (error);
3218 #ifdef MAC
3219 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3220 fromnd.ni_vp, &fromnd.ni_cnd);
3221 VOP_UNLOCK(fromnd.ni_dvp, 0);
3222 if (fromnd.ni_dvp != fromnd.ni_vp)
3223 VOP_UNLOCK(fromnd.ni_vp, 0);
3224 #endif
3225 fvp = fromnd.ni_vp;
3226 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
3227 SAVESTART | AUDITVNODE2, pathseg, new, newfd,
3228 cap_rights_init(&rights, CAP_RENAMEAT_TARGET), td);
3229 if (fromnd.ni_vp->v_type == VDIR)
3230 tond.ni_cnd.cn_flags |= WILLBEDIR;
3231 if ((error = namei(&tond)) != 0) {
3232 /* Translate error code for rename("dir1", "dir2/."). */
3233 if (error == EISDIR && fvp->v_type == VDIR)
3234 error = EINVAL;
3235 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3236 vrele(fromnd.ni_dvp);
3237 vrele(fvp);
3238 goto out1;
3239 }
3240 tdvp = tond.ni_dvp;
3241 tvp = tond.ni_vp;
3242 error = vn_start_write(fvp, &mp, V_NOWAIT);
3243 if (error != 0) {
3244 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3245 NDFREE(&tond, NDF_ONLY_PNBUF);
3246 if (tvp != NULL)
3247 vput(tvp);
3248 if (tdvp == tvp)
3249 vrele(tdvp);
3250 else
3251 vput(tdvp);
3252 vrele(fromnd.ni_dvp);
3253 vrele(fvp);
3254 vrele(tond.ni_startdir);
3255 if (fromnd.ni_startdir != NULL)
3256 vrele(fromnd.ni_startdir);
3257 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
3258 if (error != 0)
3259 return (error);
3260 goto again;
3261 }
3262 if (tvp != NULL) {
3263 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3264 error = ENOTDIR;
3265 goto out;
3266 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3267 error = EISDIR;
3268 goto out;
3269 }
3270 #ifdef CAPABILITIES
3271 if (newfd != AT_FDCWD) {
3272 /*
3273 * If the target already exists we require CAP_UNLINKAT
3274 * from 'newfd'.
3275 */
3276 error = cap_check(&tond.ni_filecaps.fc_rights,
3277 cap_rights_init(&rights, CAP_UNLINKAT));
3278 if (error != 0)
3279 goto out;
3280 }
3281 #endif
3282 }
3283 if (fvp == tdvp) {
3284 error = EINVAL;
3285 goto out;
3286 }
3287 /*
3288 * If the source is the same as the destination (that is, if they
3289 * are links to the same vnode), then there is nothing to do.
3290 */
3291 if (fvp == tvp)
3292 error = -1;
3293 #ifdef MAC
3294 else
3295 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3296 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3297 #endif
3298 out:
3299 if (error == 0) {
3300 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3301 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3302 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3303 NDFREE(&tond, NDF_ONLY_PNBUF);
3304 } else {
3305 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3306 NDFREE(&tond, NDF_ONLY_PNBUF);
3307 if (tvp != NULL)
3308 vput(tvp);
3309 if (tdvp == tvp)
3310 vrele(tdvp);
3311 else
3312 vput(tdvp);
3313 vrele(fromnd.ni_dvp);
3314 vrele(fvp);
3315 }
3316 vrele(tond.ni_startdir);
3317 vn_finished_write(mp);
3318 out1:
3319 if (fromnd.ni_startdir)
3320 vrele(fromnd.ni_startdir);
3321 if (error == -1)
3322 return (0);
3323 return (error);
3324 }
3325
3326 /*
3327 * Make a directory file.
3328 */
3329 #ifndef _SYS_SYSPROTO_H_
3330 struct mkdir_args {
3331 char *path;
3332 int mode;
3333 };
3334 #endif
3335 int
3336 sys_mkdir(struct thread *td, struct mkdir_args *uap)
3337 {
3338
3339 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3340 uap->mode));
3341 }
3342
3343 #ifndef _SYS_SYSPROTO_H_
3344 struct mkdirat_args {
3345 int fd;
3346 char *path;
3347 mode_t mode;
3348 };
3349 #endif
3350 int
3351 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3352 {
3353
3354 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3355 }
3356
3357 int
3358 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3359 int mode)
3360 {
3361 struct mount *mp;
3362 struct vnode *vp;
3363 struct vattr vattr;
3364 struct nameidata nd;
3365 cap_rights_t rights;
3366 int error;
3367
3368 AUDIT_ARG_MODE(mode);
3369 restart:
3370 bwillwrite();
3371 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
3372 NOCACHE, segflg, path, fd, cap_rights_init(&rights, CAP_MKDIRAT),
3373 td);
3374 nd.ni_cnd.cn_flags |= WILLBEDIR;
3375 if ((error = namei(&nd)) != 0)
3376 return (error);
3377 vp = nd.ni_vp;
3378 if (vp != NULL) {
3379 NDFREE(&nd, NDF_ONLY_PNBUF);
3380 /*
3381 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3382 * the strange behaviour of leaving the vnode unlocked
3383 * if the target is the same vnode as the parent.
3384 */
3385 if (vp == nd.ni_dvp)
3386 vrele(nd.ni_dvp);
3387 else
3388 vput(nd.ni_dvp);
3389 vrele(vp);
3390 return (EEXIST);
3391 }
3392 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3393 NDFREE(&nd, NDF_ONLY_PNBUF);
3394 vput(nd.ni_dvp);
3395 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3396 return (error);
3397 goto restart;
3398 }
3399 VATTR_NULL(&vattr);
3400 vattr.va_type = VDIR;
3401 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3402 #ifdef MAC
3403 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3404 &vattr);
3405 if (error != 0)
3406 goto out;
3407 #endif
3408 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3409 #ifdef MAC
3410 out:
3411 #endif
3412 NDFREE(&nd, NDF_ONLY_PNBUF);
3413 vput(nd.ni_dvp);
3414 if (error == 0)
3415 vput(nd.ni_vp);
3416 vn_finished_write(mp);
3417 return (error);
3418 }
3419
3420 /*
3421 * Remove a directory file.
3422 */
3423 #ifndef _SYS_SYSPROTO_H_
3424 struct rmdir_args {
3425 char *path;
3426 };
3427 #endif
3428 int
3429 sys_rmdir(struct thread *td, struct rmdir_args *uap)
3430 {
3431
3432 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE));
3433 }
3434
3435 int
3436 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3437 {
3438 struct mount *mp;
3439 struct vnode *vp;
3440 struct nameidata nd;
3441 cap_rights_t rights;
3442 int error;
3443
3444 restart:
3445 bwillwrite();
3446 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3447 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
3448 if ((error = namei(&nd)) != 0)
3449 return (error);
3450 vp = nd.ni_vp;
3451 if (vp->v_type != VDIR) {
3452 error = ENOTDIR;
3453 goto out;
3454 }
3455 /*
3456 * No rmdir "." please.
3457 */
3458 if (nd.ni_dvp == vp) {
3459 error = EINVAL;
3460 goto out;
3461 }
3462 /*
3463 * The root of a mounted filesystem cannot be deleted.
3464 */
3465 if (vp->v_vflag & VV_ROOT) {
3466 error = EBUSY;
3467 goto out;
3468 }
3469 #ifdef MAC
3470 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3471 &nd.ni_cnd);
3472 if (error != 0)
3473 goto out;
3474 #endif
3475 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3476 NDFREE(&nd, NDF_ONLY_PNBUF);
3477 vput(vp);
3478 if (nd.ni_dvp == vp)
3479 vrele(nd.ni_dvp);
3480 else
3481 vput(nd.ni_dvp);
3482 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3483 return (error);
3484 goto restart;
3485 }
3486 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3487 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3488 vn_finished_write(mp);
3489 out:
3490 NDFREE(&nd, NDF_ONLY_PNBUF);
3491 vput(vp);
3492 if (nd.ni_dvp == vp)
3493 vrele(nd.ni_dvp);
3494 else
3495 vput(nd.ni_dvp);
3496 return (error);
3497 }
3498
3499 #ifdef COMPAT_43
3500 /*
3501 * Read a block of directory entries in a filesystem independent format.
3502 */
3503 #ifndef _SYS_SYSPROTO_H_
3504 struct ogetdirentries_args {
3505 int fd;
3506 char *buf;
3507 u_int count;
3508 long *basep;
3509 };
3510 #endif
3511 int
3512 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
3513 {
3514 long loff;
3515 int error;
3516
3517 error = kern_ogetdirentries(td, uap, &loff);
3518 if (error == 0)
3519 error = copyout(&loff, uap->basep, sizeof(long));
3520 return (error);
3521 }
3522
3523 int
3524 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
3525 long *ploff)
3526 {
3527 struct vnode *vp;
3528 struct file *fp;
3529 struct uio auio, kuio;
3530 struct iovec aiov, kiov;
3531 struct dirent *dp, *edp;
3532 cap_rights_t rights;
3533 caddr_t dirbuf;
3534 int error, eofflag, readcnt;
3535 long loff;
3536 off_t foffset;
3537
3538 /* XXX arbitrary sanity limit on `count'. */
3539 if (uap->count > 64 * 1024)
3540 return (EINVAL);
3541 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_READ), &fp);
3542 if (error != 0)
3543 return (error);
3544 if ((fp->f_flag & FREAD) == 0) {
3545 fdrop(fp, td);
3546 return (EBADF);
3547 }
3548 vp = fp->f_vnode;
3549 foffset = foffset_lock(fp, 0);
3550 unionread:
3551 if (vp->v_type != VDIR) {
3552 foffset_unlock(fp, foffset, 0);
3553 fdrop(fp, td);
3554 return (EINVAL);
3555 }
3556 aiov.iov_base = uap->buf;
3557 aiov.iov_len = uap->count;
3558 auio.uio_iov = &aiov;
3559 auio.uio_iovcnt = 1;
3560 auio.uio_rw = UIO_READ;
3561 auio.uio_segflg = UIO_USERSPACE;
3562 auio.uio_td = td;
3563 auio.uio_resid = uap->count;
3564 vn_lock(vp, LK_SHARED | LK_RETRY);
3565 loff = auio.uio_offset = foffset;
3566 #ifdef MAC
3567 error = mac_vnode_check_readdir(td->td_ucred, vp);
3568 if (error != 0) {
3569 VOP_UNLOCK(vp, 0);
3570 foffset_unlock(fp, foffset, FOF_NOUPDATE);
3571 fdrop(fp, td);
3572 return (error);
3573 }
3574 #endif
3575 # if (BYTE_ORDER != LITTLE_ENDIAN)
3576 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
3577 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
3578 NULL, NULL);
3579 foffset = auio.uio_offset;
3580 } else
3581 # endif
3582 {
3583 kuio = auio;
3584 kuio.uio_iov = &kiov;
3585 kuio.uio_segflg = UIO_SYSSPACE;
3586 kiov.iov_len = uap->count;
3587 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK);
3588 kiov.iov_base = dirbuf;
3589 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
3590 NULL, NULL);
3591 foffset = kuio.uio_offset;
3592 if (error == 0) {
3593 readcnt = uap->count - kuio.uio_resid;
3594 edp = (struct dirent *)&dirbuf[readcnt];
3595 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
3596 # if (BYTE_ORDER == LITTLE_ENDIAN)
3597 /*
3598 * The expected low byte of
3599 * dp->d_namlen is our dp->d_type.
3600 * The high MBZ byte of dp->d_namlen
3601 * is our dp->d_namlen.
3602 */
3603 dp->d_type = dp->d_namlen;
3604 dp->d_namlen = 0;
3605 # else
3606 /*
3607 * The dp->d_type is the high byte
3608 * of the expected dp->d_namlen,
3609 * so must be zero'ed.
3610 */
3611 dp->d_type = 0;
3612 # endif
3613 if (dp->d_reclen > 0) {
3614 dp = (struct dirent *)
3615 ((char *)dp + dp->d_reclen);
3616 } else {
3617 error = EIO;
3618 break;
3619 }
3620 }
3621 if (dp >= edp)
3622 error = uiomove(dirbuf, readcnt, &auio);
3623 }
3624 free(dirbuf, M_TEMP);
3625 }
3626 if (error != 0) {
3627 VOP_UNLOCK(vp, 0);
3628 foffset_unlock(fp, foffset, 0);
3629 fdrop(fp, td);
3630 return (error);
3631 }
3632 if (uap->count == auio.uio_resid &&
3633 (vp->v_vflag & VV_ROOT) &&
3634 (vp->v_mount->mnt_flag & MNT_UNION)) {
3635 struct vnode *tvp = vp;
3636 vp = vp->v_mount->mnt_vnodecovered;
3637 VREF(vp);
3638 fp->f_vnode = vp;
3639 fp->f_data = vp;
3640 foffset = 0;
3641 vput(tvp);
3642 goto unionread;
3643 }
3644 VOP_UNLOCK(vp, 0);
3645 foffset_unlock(fp, foffset, 0);
3646 fdrop(fp, td);
3647 td->td_retval[0] = uap->count - auio.uio_resid;
3648 if (error == 0)
3649 *ploff = loff;
3650 return (error);
3651 }
3652 #endif /* COMPAT_43 */
3653
3654 /*
3655 * Read a block of directory entries in a filesystem independent format.
3656 */
3657 #ifndef _SYS_SYSPROTO_H_
3658 struct getdirentries_args {
3659 int fd;
3660 char *buf;
3661 u_int count;
3662 long *basep;
3663 };
3664 #endif
3665 int
3666 sys_getdirentries(struct thread *td, struct getdirentries_args *uap)
3667 {
3668 long base;
3669 int error;
3670
3671 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
3672 NULL, UIO_USERSPACE);
3673 if (error != 0)
3674 return (error);
3675 if (uap->basep != NULL)
3676 error = copyout(&base, uap->basep, sizeof(long));
3677 return (error);
3678 }
3679
3680 int
3681 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count,
3682 long *basep, ssize_t *residp, enum uio_seg bufseg)
3683 {
3684 struct vnode *vp;
3685 struct file *fp;
3686 struct uio auio;
3687 struct iovec aiov;
3688 cap_rights_t rights;
3689 long loff;
3690 int error, eofflag;
3691 off_t foffset;
3692
3693 AUDIT_ARG_FD(fd);
3694 if (count > IOSIZE_MAX)
3695 return (EINVAL);
3696 auio.uio_resid = count;
3697 error = getvnode(td, fd, cap_rights_init(&rights, CAP_READ), &fp);
3698 if (error != 0)
3699 return (error);
3700 if ((fp->f_flag & FREAD) == 0) {
3701 fdrop(fp, td);
3702 return (EBADF);
3703 }
3704 vp = fp->f_vnode;
3705 foffset = foffset_lock(fp, 0);
3706 unionread:
3707 if (vp->v_type != VDIR) {
3708 error = EINVAL;
3709 goto fail;
3710 }
3711 aiov.iov_base = buf;
3712 aiov.iov_len = count;
3713 auio.uio_iov = &aiov;
3714 auio.uio_iovcnt = 1;
3715 auio.uio_rw = UIO_READ;
3716 auio.uio_segflg = bufseg;
3717 auio.uio_td = td;
3718 vn_lock(vp, LK_SHARED | LK_RETRY);
3719 AUDIT_ARG_VNODE1(vp);
3720 loff = auio.uio_offset = foffset;
3721 #ifdef MAC
3722 error = mac_vnode_check_readdir(td->td_ucred, vp);
3723 if (error == 0)
3724 #endif
3725 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
3726 NULL);
3727 foffset = auio.uio_offset;
3728 if (error != 0) {
3729 VOP_UNLOCK(vp, 0);
3730 goto fail;
3731 }
3732 if (count == auio.uio_resid &&
3733 (vp->v_vflag & VV_ROOT) &&
3734 (vp->v_mount->mnt_flag & MNT_UNION)) {
3735 struct vnode *tvp = vp;
3736
3737 vp = vp->v_mount->mnt_vnodecovered;
3738 VREF(vp);
3739 fp->f_vnode = vp;
3740 fp->f_data = vp;
3741 foffset = 0;
3742 vput(tvp);
3743 goto unionread;
3744 }
3745 VOP_UNLOCK(vp, 0);
3746 *basep = loff;
3747 if (residp != NULL)
3748 *residp = auio.uio_resid;
3749 td->td_retval[0] = count - auio.uio_resid;
3750 fail:
3751 foffset_unlock(fp, foffset, 0);
3752 fdrop(fp, td);
3753 return (error);
3754 }
3755
3756 #ifndef _SYS_SYSPROTO_H_
3757 struct getdents_args {
3758 int fd;
3759 char *buf;
3760 size_t count;
3761 };
3762 #endif
3763 int
3764 sys_getdents(struct thread *td, struct getdents_args *uap)
3765 {
3766 struct getdirentries_args ap;
3767
3768 ap.fd = uap->fd;
3769 ap.buf = uap->buf;
3770 ap.count = uap->count;
3771 ap.basep = NULL;
3772 return (sys_getdirentries(td, &ap));
3773 }
3774
3775 /*
3776 * Set the mode mask for creation of filesystem nodes.
3777 */
3778 #ifndef _SYS_SYSPROTO_H_
3779 struct umask_args {
3780 int newmask;
3781 };
3782 #endif
3783 int
3784 sys_umask(struct thread *td, struct umask_args *uap)
3785 {
3786 struct filedesc *fdp;
3787
3788 fdp = td->td_proc->p_fd;
3789 FILEDESC_XLOCK(fdp);
3790 td->td_retval[0] = fdp->fd_cmask;
3791 fdp->fd_cmask = uap->newmask & ALLPERMS;
3792 FILEDESC_XUNLOCK(fdp);
3793 return (0);
3794 }
3795
3796 /*
3797 * Void all references to file by ripping underlying filesystem away from
3798 * vnode.
3799 */
3800 #ifndef _SYS_SYSPROTO_H_
3801 struct revoke_args {
3802 char *path;
3803 };
3804 #endif
3805 int
3806 sys_revoke(struct thread *td, struct revoke_args *uap)
3807 {
3808 struct vnode *vp;
3809 struct vattr vattr;
3810 struct nameidata nd;
3811 int error;
3812
3813 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
3814 uap->path, td);
3815 if ((error = namei(&nd)) != 0)
3816 return (error);
3817 vp = nd.ni_vp;
3818 NDFREE(&nd, NDF_ONLY_PNBUF);
3819 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
3820 error = EINVAL;
3821 goto out;
3822 }
3823 #ifdef MAC
3824 error = mac_vnode_check_revoke(td->td_ucred, vp);
3825 if (error != 0)
3826 goto out;
3827 #endif
3828 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
3829 if (error != 0)
3830 goto out;
3831 if (td->td_ucred->cr_uid != vattr.va_uid) {
3832 error = priv_check(td, PRIV_VFS_ADMIN);
3833 if (error != 0)
3834 goto out;
3835 }
3836 if (vcount(vp) > 1)
3837 VOP_REVOKE(vp, REVOKEALL);
3838 out:
3839 vput(vp);
3840 return (error);
3841 }
3842
3843 /*
3844 * Convert a user file descriptor to a kernel file entry and check that, if it
3845 * is a capability, the correct rights are present. A reference on the file
3846 * entry is held upon returning.
3847 */
3848 int
3849 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
3850 {
3851 struct file *fp;
3852 int error;
3853
3854 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL);
3855 if (error != 0)
3856 return (error);
3857
3858 /*
3859 * The file could be not of the vnode type, or it may be not
3860 * yet fully initialized, in which case the f_vnode pointer
3861 * may be set, but f_ops is still badfileops. E.g.,
3862 * devfs_open() transiently create such situation to
3863 * facilitate csw d_fdopen().
3864 *
3865 * Dupfdopen() handling in kern_openat() installs the
3866 * half-baked file into the process descriptor table, allowing
3867 * other thread to dereference it. Guard against the race by
3868 * checking f_ops.
3869 */
3870 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
3871 fdrop(fp, td);
3872 return (EINVAL);
3873 }
3874 *fpp = fp;
3875 return (0);
3876 }
3877
3878
3879 /*
3880 * Get an (NFS) file handle.
3881 */
3882 #ifndef _SYS_SYSPROTO_H_
3883 struct lgetfh_args {
3884 char *fname;
3885 fhandle_t *fhp;
3886 };
3887 #endif
3888 int
3889 sys_lgetfh(struct thread *td, struct lgetfh_args *uap)
3890 {
3891 struct nameidata nd;
3892 fhandle_t fh;
3893 struct vnode *vp;
3894 int error;
3895
3896 error = priv_check(td, PRIV_VFS_GETFH);
3897 if (error != 0)
3898 return (error);
3899 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
3900 uap->fname, td);
3901 error = namei(&nd);
3902 if (error != 0)
3903 return (error);
3904 NDFREE(&nd, NDF_ONLY_PNBUF);
3905 vp = nd.ni_vp;
3906 bzero(&fh, sizeof(fh));
3907 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
3908 error = VOP_VPTOFH(vp, &fh.fh_fid);
3909 vput(vp);
3910 if (error == 0)
3911 error = copyout(&fh, uap->fhp, sizeof (fh));
3912 return (error);
3913 }
3914
3915 #ifndef _SYS_SYSPROTO_H_
3916 struct getfh_args {
3917 char *fname;
3918 fhandle_t *fhp;
3919 };
3920 #endif
3921 int
3922 sys_getfh(struct thread *td, struct getfh_args *uap)
3923 {
3924 struct nameidata nd;
3925 fhandle_t fh;
3926 struct vnode *vp;
3927 int error;
3928
3929 error = priv_check(td, PRIV_VFS_GETFH);
3930 if (error != 0)
3931 return (error);
3932 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
3933 uap->fname, td);
3934 error = namei(&nd);
3935 if (error != 0)
3936 return (error);
3937 NDFREE(&nd, NDF_ONLY_PNBUF);
3938 vp = nd.ni_vp;
3939 bzero(&fh, sizeof(fh));
3940 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
3941 error = VOP_VPTOFH(vp, &fh.fh_fid);
3942 vput(vp);
3943 if (error == 0)
3944 error = copyout(&fh, uap->fhp, sizeof (fh));
3945 return (error);
3946 }
3947
3948 /*
3949 * syscall for the rpc.lockd to use to translate a NFS file handle into an
3950 * open descriptor.
3951 *
3952 * warning: do not remove the priv_check() call or this becomes one giant
3953 * security hole.
3954 */
3955 #ifndef _SYS_SYSPROTO_H_
3956 struct fhopen_args {
3957 const struct fhandle *u_fhp;
3958 int flags;
3959 };
3960 #endif
3961 int
3962 sys_fhopen(struct thread *td, struct fhopen_args *uap)
3963 {
3964 struct mount *mp;
3965 struct vnode *vp;
3966 struct fhandle fhp;
3967 struct file *fp;
3968 int fmode, error;
3969 int indx;
3970
3971 error = priv_check(td, PRIV_VFS_FHOPEN);
3972 if (error != 0)
3973 return (error);
3974 indx = -1;
3975 fmode = FFLAGS(uap->flags);
3976 /* why not allow a non-read/write open for our lockd? */
3977 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
3978 return (EINVAL);
3979 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
3980 if (error != 0)
3981 return(error);
3982 /* find the mount point */
3983 mp = vfs_busyfs(&fhp.fh_fsid);
3984 if (mp == NULL)
3985 return (ESTALE);
3986 /* now give me my vnode, it gets returned to me locked */
3987 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
3988 vfs_unbusy(mp);
3989 if (error != 0)
3990 return (error);
3991
3992 error = falloc_noinstall(td, &fp);
3993 if (error != 0) {
3994 vput(vp);
3995 return (error);
3996 }
3997 /*
3998 * An extra reference on `fp' has been held for us by
3999 * falloc_noinstall().
4000 */
4001
4002 #ifdef INVARIANTS
4003 td->td_dupfd = -1;
4004 #endif
4005 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4006 if (error != 0) {
4007 KASSERT(fp->f_ops == &badfileops,
4008 ("VOP_OPEN in fhopen() set f_ops"));
4009 KASSERT(td->td_dupfd < 0,
4010 ("fhopen() encountered fdopen()"));
4011
4012 vput(vp);
4013 goto bad;
4014 }
4015 #ifdef INVARIANTS
4016 td->td_dupfd = 0;
4017 #endif
4018 fp->f_vnode = vp;
4019 fp->f_seqcount = 1;
4020 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
4021 &vnops);
4022 VOP_UNLOCK(vp, 0);
4023 if ((fmode & O_TRUNC) != 0) {
4024 error = fo_truncate(fp, 0, td->td_ucred, td);
4025 if (error != 0)
4026 goto bad;
4027 }
4028
4029 error = finstall(td, fp, &indx, fmode, NULL);
4030 bad:
4031 fdrop(fp, td);
4032 td->td_retval[0] = indx;
4033 return (error);
4034 }
4035
4036 /*
4037 * Stat an (NFS) file handle.
4038 */
4039 #ifndef _SYS_SYSPROTO_H_
4040 struct fhstat_args {
4041 struct fhandle *u_fhp;
4042 struct stat *sb;
4043 };
4044 #endif
4045 int
4046 sys_fhstat(struct thread *td, struct fhstat_args *uap)
4047 {
4048 struct stat sb;
4049 struct fhandle fh;
4050 int error;
4051
4052 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4053 if (error != 0)
4054 return (error);
4055 error = kern_fhstat(td, fh, &sb);
4056 if (error == 0)
4057 error = copyout(&sb, uap->sb, sizeof(sb));
4058 return (error);
4059 }
4060
4061 int
4062 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4063 {
4064 struct mount *mp;
4065 struct vnode *vp;
4066 int error;
4067
4068 error = priv_check(td, PRIV_VFS_FHSTAT);
4069 if (error != 0)
4070 return (error);
4071 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4072 return (ESTALE);
4073 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4074 vfs_unbusy(mp);
4075 if (error != 0)
4076 return (error);
4077 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
4078 vput(vp);
4079 return (error);
4080 }
4081
4082 /*
4083 * Implement fstatfs() for (NFS) file handles.
4084 */
4085 #ifndef _SYS_SYSPROTO_H_
4086 struct fhstatfs_args {
4087 struct fhandle *u_fhp;
4088 struct statfs *buf;
4089 };
4090 #endif
4091 int
4092 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap)
4093 {
4094 struct statfs *sfp;
4095 fhandle_t fh;
4096 int error;
4097
4098 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4099 if (error != 0)
4100 return (error);
4101 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
4102 error = kern_fhstatfs(td, fh, sfp);
4103 if (error == 0)
4104 error = copyout(sfp, uap->buf, sizeof(*sfp));
4105 free(sfp, M_STATFS);
4106 return (error);
4107 }
4108
4109 int
4110 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4111 {
4112 struct statfs *sp;
4113 struct mount *mp;
4114 struct vnode *vp;
4115 int error;
4116
4117 error = priv_check(td, PRIV_VFS_FHSTATFS);
4118 if (error != 0)
4119 return (error);
4120 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4121 return (ESTALE);
4122 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4123 if (error != 0) {
4124 vfs_unbusy(mp);
4125 return (error);
4126 }
4127 vput(vp);
4128 error = prison_canseemount(td->td_ucred, mp);
4129 if (error != 0)
4130 goto out;
4131 #ifdef MAC
4132 error = mac_mount_check_stat(td->td_ucred, mp);
4133 if (error != 0)
4134 goto out;
4135 #endif
4136 /*
4137 * Set these in case the underlying filesystem fails to do so.
4138 */
4139 sp = &mp->mnt_stat;
4140 sp->f_version = STATFS_VERSION;
4141 sp->f_namemax = NAME_MAX;
4142 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4143 error = VFS_STATFS(mp, sp);
4144 if (error == 0)
4145 *buf = *sp;
4146 out:
4147 vfs_unbusy(mp);
4148 return (error);
4149 }
4150
4151 int
4152 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
4153 {
4154 struct file *fp;
4155 struct mount *mp;
4156 struct vnode *vp;
4157 cap_rights_t rights;
4158 off_t olen, ooffset;
4159 int error;
4160
4161 if (offset < 0 || len <= 0)
4162 return (EINVAL);
4163 /* Check for wrap. */
4164 if (offset > OFF_MAX - len)
4165 return (EFBIG);
4166 error = fget(td, fd, cap_rights_init(&rights, CAP_PWRITE), &fp);
4167 if (error != 0)
4168 return (error);
4169 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4170 error = ESPIPE;
4171 goto out;
4172 }
4173 if ((fp->f_flag & FWRITE) == 0) {
4174 error = EBADF;
4175 goto out;
4176 }
4177 if (fp->f_type != DTYPE_VNODE) {
4178 error = ENODEV;
4179 goto out;
4180 }
4181 vp = fp->f_vnode;
4182 if (vp->v_type != VREG) {
4183 error = ENODEV;
4184 goto out;
4185 }
4186
4187 /* Allocating blocks may take a long time, so iterate. */
4188 for (;;) {
4189 olen = len;
4190 ooffset = offset;
4191
4192 bwillwrite();
4193 mp = NULL;
4194 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
4195 if (error != 0)
4196 break;
4197 error = vn_lock(vp, LK_EXCLUSIVE);
4198 if (error != 0) {
4199 vn_finished_write(mp);
4200 break;
4201 }
4202 #ifdef MAC
4203 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
4204 if (error == 0)
4205 #endif
4206 error = VOP_ALLOCATE(vp, &offset, &len);
4207 VOP_UNLOCK(vp, 0);
4208 vn_finished_write(mp);
4209
4210 if (olen + ooffset != offset + len) {
4211 panic("offset + len changed from %jx/%jx to %jx/%jx",
4212 ooffset, olen, offset, len);
4213 }
4214 if (error != 0 || len == 0)
4215 break;
4216 KASSERT(olen > len, ("Iteration did not make progress?"));
4217 maybe_yield();
4218 }
4219 out:
4220 fdrop(fp, td);
4221 return (error);
4222 }
4223
4224 int
4225 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
4226 {
4227 int error;
4228
4229 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len);
4230 return (kern_posix_error(td, error));
4231 }
4232
4233 /*
4234 * Unlike madvise(2), we do not make a best effort to remember every
4235 * possible caching hint. Instead, we remember the last setting with
4236 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4237 * region of any current setting.
4238 */
4239 int
4240 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4241 int advice)
4242 {
4243 struct fadvise_info *fa, *new;
4244 struct file *fp;
4245 struct vnode *vp;
4246 cap_rights_t rights;
4247 off_t end;
4248 int error;
4249
4250 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4251 return (EINVAL);
4252 switch (advice) {
4253 case POSIX_FADV_SEQUENTIAL:
4254 case POSIX_FADV_RANDOM:
4255 case POSIX_FADV_NOREUSE:
4256 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4257 break;
4258 case POSIX_FADV_NORMAL:
4259 case POSIX_FADV_WILLNEED:
4260 case POSIX_FADV_DONTNEED:
4261 new = NULL;
4262 break;
4263 default:
4264 return (EINVAL);
4265 }
4266 /* XXX: CAP_POSIX_FADVISE? */
4267 error = fget(td, fd, cap_rights_init(&rights), &fp);
4268 if (error != 0)
4269 goto out;
4270 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4271 error = ESPIPE;
4272 goto out;
4273 }
4274 if (fp->f_type != DTYPE_VNODE) {
4275 error = ENODEV;
4276 goto out;
4277 }
4278 vp = fp->f_vnode;
4279 if (vp->v_type != VREG) {
4280 error = ENODEV;
4281 goto out;
4282 }
4283 if (len == 0)
4284 end = OFF_MAX;
4285 else
4286 end = offset + len - 1;
4287 switch (advice) {
4288 case POSIX_FADV_SEQUENTIAL:
4289 case POSIX_FADV_RANDOM:
4290 case POSIX_FADV_NOREUSE:
4291 /*
4292 * Try to merge any existing non-standard region with
4293 * this new region if possible, otherwise create a new
4294 * non-standard region for this request.
4295 */
4296 mtx_pool_lock(mtxpool_sleep, fp);
4297 fa = fp->f_advice;
4298 if (fa != NULL && fa->fa_advice == advice &&
4299 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4300 (end != OFF_MAX && fa->fa_start == end + 1) ||
4301 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4302 if (offset < fa->fa_start)
4303 fa->fa_start = offset;
4304 if (end > fa->fa_end)
4305 fa->fa_end = end;
4306 } else {
4307 new->fa_advice = advice;
4308 new->fa_start = offset;
4309 new->fa_end = end;
4310 fp->f_advice = new;
4311 new = fa;
4312 }
4313 mtx_pool_unlock(mtxpool_sleep, fp);
4314 break;
4315 case POSIX_FADV_NORMAL:
4316 /*
4317 * If a the "normal" region overlaps with an existing
4318 * non-standard region, trim or remove the
4319 * non-standard region.
4320 */
4321 mtx_pool_lock(mtxpool_sleep, fp);
4322 fa = fp->f_advice;
4323 if (fa != NULL) {
4324 if (offset <= fa->fa_start && end >= fa->fa_end) {
4325 new = fa;
4326 fp->f_advice = NULL;
4327 } else if (offset <= fa->fa_start &&
4328 end >= fa->fa_start)
4329 fa->fa_start = end + 1;
4330 else if (offset <= fa->fa_end && end >= fa->fa_end)
4331 fa->fa_end = offset - 1;
4332 else if (offset >= fa->fa_start && end <= fa->fa_end) {
4333 /*
4334 * If the "normal" region is a middle
4335 * portion of the existing
4336 * non-standard region, just remove
4337 * the whole thing rather than picking
4338 * one side or the other to
4339 * preserve.
4340 */
4341 new = fa;
4342 fp->f_advice = NULL;
4343 }
4344 }
4345 mtx_pool_unlock(mtxpool_sleep, fp);
4346 break;
4347 case POSIX_FADV_WILLNEED:
4348 case POSIX_FADV_DONTNEED:
4349 error = VOP_ADVISE(vp, offset, end, advice);
4350 break;
4351 }
4352 out:
4353 if (fp != NULL)
4354 fdrop(fp, td);
4355 free(new, M_FADVISE);
4356 return (error);
4357 }
4358
4359 int
4360 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4361 {
4362 int error;
4363
4364 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
4365 uap->advice);
4366 return (kern_posix_error(td, error));
4367 }
Cache object: 71e6f3c5584eaa55418eaf66a4a9d129
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