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/8.1/sys/kern/vfs_syscalls.c 208694 2010-06-01 14:04:33Z rwatson $");
39
40 #include "opt_compat.h"
41 #include "opt_kdtrace.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/disk.h>
49 #include <sys/sysent.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
52 #include <sys/mutex.h>
53 #include <sys/sysproto.h>
54 #include <sys/namei.h>
55 #include <sys/filedesc.h>
56 #include <sys/kernel.h>
57 #include <sys/fcntl.h>
58 #include <sys/file.h>
59 #include <sys/filio.h>
60 #include <sys/limits.h>
61 #include <sys/linker.h>
62 #include <sys/sdt.h>
63 #include <sys/stat.h>
64 #include <sys/sx.h>
65 #include <sys/unistd.h>
66 #include <sys/vnode.h>
67 #include <sys/priv.h>
68 #include <sys/proc.h>
69 #include <sys/dirent.h>
70 #include <sys/jail.h>
71 #include <sys/syscallsubr.h>
72 #include <sys/sysctl.h>
73 #ifdef KTRACE
74 #include <sys/ktrace.h>
75 #endif
76
77 #include <machine/stdarg.h>
78
79 #include <security/audit/audit.h>
80 #include <security/mac/mac_framework.h>
81
82 #include <vm/vm.h>
83 #include <vm/vm_object.h>
84 #include <vm/vm_page.h>
85 #include <vm/uma.h>
86
87 SDT_PROVIDER_DEFINE(vfs);
88 SDT_PROBE_DEFINE(vfs, , stat, mode);
89 SDT_PROBE_ARGTYPE(vfs, , stat, mode, 0, "char *");
90 SDT_PROBE_ARGTYPE(vfs, , stat, mode, 1, "int");
91 SDT_PROBE_DEFINE(vfs, , stat, reg);
92 SDT_PROBE_ARGTYPE(vfs, , stat, reg, 0, "char *");
93 SDT_PROBE_ARGTYPE(vfs, , stat, reg, 1, "int");
94
95 static int chroot_refuse_vdir_fds(struct filedesc *fdp);
96 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
97 static int setfown(struct thread *td, struct vnode *, uid_t, gid_t);
98 static int setfmode(struct thread *td, struct vnode *, int);
99 static int setfflags(struct thread *td, struct vnode *, int);
100 static int setutimes(struct thread *td, struct vnode *,
101 const struct timespec *, int, int);
102 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
103 struct thread *td);
104
105 /*
106 * The module initialization routine for POSIX asynchronous I/O will
107 * set this to the version of AIO that it implements. (Zero means
108 * that it is not implemented.) This value is used here by pathconf()
109 * and in kern_descrip.c by fpathconf().
110 */
111 int async_io_version;
112
113 #ifdef DEBUG
114 static int syncprt = 0;
115 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
116 #endif
117
118 /*
119 * Sync each mounted filesystem.
120 */
121 #ifndef _SYS_SYSPROTO_H_
122 struct sync_args {
123 int dummy;
124 };
125 #endif
126 /* ARGSUSED */
127 int
128 sync(td, uap)
129 struct thread *td;
130 struct sync_args *uap;
131 {
132 struct mount *mp, *nmp;
133 int vfslocked;
134
135 mtx_lock(&mountlist_mtx);
136 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
137 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
138 nmp = TAILQ_NEXT(mp, mnt_list);
139 continue;
140 }
141 vfslocked = VFS_LOCK_GIANT(mp);
142 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
143 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
144 MNT_ILOCK(mp);
145 mp->mnt_noasync++;
146 mp->mnt_kern_flag &= ~MNTK_ASYNC;
147 MNT_IUNLOCK(mp);
148 vfs_msync(mp, MNT_NOWAIT);
149 VFS_SYNC(mp, MNT_NOWAIT);
150 MNT_ILOCK(mp);
151 mp->mnt_noasync--;
152 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
153 mp->mnt_noasync == 0)
154 mp->mnt_kern_flag |= MNTK_ASYNC;
155 MNT_IUNLOCK(mp);
156 vn_finished_write(mp);
157 }
158 VFS_UNLOCK_GIANT(vfslocked);
159 mtx_lock(&mountlist_mtx);
160 nmp = TAILQ_NEXT(mp, mnt_list);
161 vfs_unbusy(mp);
162 }
163 mtx_unlock(&mountlist_mtx);
164 return (0);
165 }
166
167 /*
168 * Change filesystem quotas.
169 */
170 #ifndef _SYS_SYSPROTO_H_
171 struct quotactl_args {
172 char *path;
173 int cmd;
174 int uid;
175 caddr_t arg;
176 };
177 #endif
178 int
179 quotactl(td, uap)
180 struct thread *td;
181 register struct quotactl_args /* {
182 char *path;
183 int cmd;
184 int uid;
185 caddr_t arg;
186 } */ *uap;
187 {
188 struct mount *mp;
189 int vfslocked;
190 int error;
191 struct nameidata nd;
192
193 AUDIT_ARG_CMD(uap->cmd);
194 AUDIT_ARG_UID(uap->uid);
195 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
196 return (EPERM);
197 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
198 UIO_USERSPACE, uap->path, td);
199 if ((error = namei(&nd)) != 0)
200 return (error);
201 vfslocked = NDHASGIANT(&nd);
202 NDFREE(&nd, NDF_ONLY_PNBUF);
203 mp = nd.ni_vp->v_mount;
204 vfs_ref(mp);
205 vput(nd.ni_vp);
206 error = vfs_busy(mp, 0);
207 vfs_rel(mp);
208 if (error) {
209 VFS_UNLOCK_GIANT(vfslocked);
210 return (error);
211 }
212 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
213 vfs_unbusy(mp);
214 VFS_UNLOCK_GIANT(vfslocked);
215 return (error);
216 }
217
218 /*
219 * Used by statfs conversion routines to scale the block size up if
220 * necessary so that all of the block counts are <= 'max_size'. Note
221 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
222 * value of 'n'.
223 */
224 void
225 statfs_scale_blocks(struct statfs *sf, long max_size)
226 {
227 uint64_t count;
228 int shift;
229
230 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
231
232 /*
233 * Attempt to scale the block counts to give a more accurate
234 * overview to userland of the ratio of free space to used
235 * space. To do this, find the largest block count and compute
236 * a divisor that lets it fit into a signed integer <= max_size.
237 */
238 if (sf->f_bavail < 0)
239 count = -sf->f_bavail;
240 else
241 count = sf->f_bavail;
242 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
243 if (count <= max_size)
244 return;
245
246 count >>= flsl(max_size);
247 shift = 0;
248 while (count > 0) {
249 shift++;
250 count >>=1;
251 }
252
253 sf->f_bsize <<= shift;
254 sf->f_blocks >>= shift;
255 sf->f_bfree >>= shift;
256 sf->f_bavail >>= shift;
257 }
258
259 /*
260 * Get filesystem statistics.
261 */
262 #ifndef _SYS_SYSPROTO_H_
263 struct statfs_args {
264 char *path;
265 struct statfs *buf;
266 };
267 #endif
268 int
269 statfs(td, uap)
270 struct thread *td;
271 register struct statfs_args /* {
272 char *path;
273 struct statfs *buf;
274 } */ *uap;
275 {
276 struct statfs sf;
277 int error;
278
279 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
280 if (error == 0)
281 error = copyout(&sf, uap->buf, sizeof(sf));
282 return (error);
283 }
284
285 int
286 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
287 struct statfs *buf)
288 {
289 struct mount *mp;
290 struct statfs *sp, sb;
291 int vfslocked;
292 int error;
293 struct nameidata nd;
294
295 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
296 AUDITVNODE1, pathseg, path, td);
297 error = namei(&nd);
298 if (error)
299 return (error);
300 vfslocked = NDHASGIANT(&nd);
301 mp = nd.ni_vp->v_mount;
302 vfs_ref(mp);
303 NDFREE(&nd, NDF_ONLY_PNBUF);
304 vput(nd.ni_vp);
305 error = vfs_busy(mp, 0);
306 vfs_rel(mp);
307 if (error) {
308 VFS_UNLOCK_GIANT(vfslocked);
309 return (error);
310 }
311 #ifdef MAC
312 error = mac_mount_check_stat(td->td_ucred, mp);
313 if (error)
314 goto out;
315 #endif
316 /*
317 * Set these in case the underlying filesystem fails to do so.
318 */
319 sp = &mp->mnt_stat;
320 sp->f_version = STATFS_VERSION;
321 sp->f_namemax = NAME_MAX;
322 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
323 error = VFS_STATFS(mp, sp);
324 if (error)
325 goto out;
326 if (priv_check(td, PRIV_VFS_GENERATION)) {
327 bcopy(sp, &sb, sizeof(sb));
328 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
329 prison_enforce_statfs(td->td_ucred, mp, &sb);
330 sp = &sb;
331 }
332 *buf = *sp;
333 out:
334 vfs_unbusy(mp);
335 VFS_UNLOCK_GIANT(vfslocked);
336 return (error);
337 }
338
339 /*
340 * Get filesystem statistics.
341 */
342 #ifndef _SYS_SYSPROTO_H_
343 struct fstatfs_args {
344 int fd;
345 struct statfs *buf;
346 };
347 #endif
348 int
349 fstatfs(td, uap)
350 struct thread *td;
351 register struct fstatfs_args /* {
352 int fd;
353 struct statfs *buf;
354 } */ *uap;
355 {
356 struct statfs sf;
357 int error;
358
359 error = kern_fstatfs(td, uap->fd, &sf);
360 if (error == 0)
361 error = copyout(&sf, uap->buf, sizeof(sf));
362 return (error);
363 }
364
365 int
366 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
367 {
368 struct file *fp;
369 struct mount *mp;
370 struct statfs *sp, sb;
371 int vfslocked;
372 struct vnode *vp;
373 int error;
374
375 AUDIT_ARG_FD(fd);
376 error = getvnode(td->td_proc->p_fd, fd, &fp);
377 if (error)
378 return (error);
379 vp = fp->f_vnode;
380 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
381 vn_lock(vp, LK_SHARED | LK_RETRY);
382 #ifdef AUDIT
383 AUDIT_ARG_VNODE1(vp);
384 #endif
385 mp = vp->v_mount;
386 if (mp)
387 vfs_ref(mp);
388 VOP_UNLOCK(vp, 0);
389 fdrop(fp, td);
390 if (mp == NULL) {
391 error = EBADF;
392 goto out;
393 }
394 error = vfs_busy(mp, 0);
395 vfs_rel(mp);
396 if (error) {
397 VFS_UNLOCK_GIANT(vfslocked);
398 return (error);
399 }
400 #ifdef MAC
401 error = mac_mount_check_stat(td->td_ucred, mp);
402 if (error)
403 goto out;
404 #endif
405 /*
406 * Set these in case the underlying filesystem fails to do so.
407 */
408 sp = &mp->mnt_stat;
409 sp->f_version = STATFS_VERSION;
410 sp->f_namemax = NAME_MAX;
411 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
412 error = VFS_STATFS(mp, sp);
413 if (error)
414 goto out;
415 if (priv_check(td, PRIV_VFS_GENERATION)) {
416 bcopy(sp, &sb, sizeof(sb));
417 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
418 prison_enforce_statfs(td->td_ucred, mp, &sb);
419 sp = &sb;
420 }
421 *buf = *sp;
422 out:
423 if (mp)
424 vfs_unbusy(mp);
425 VFS_UNLOCK_GIANT(vfslocked);
426 return (error);
427 }
428
429 /*
430 * Get statistics on all filesystems.
431 */
432 #ifndef _SYS_SYSPROTO_H_
433 struct getfsstat_args {
434 struct statfs *buf;
435 long bufsize;
436 int flags;
437 };
438 #endif
439 int
440 getfsstat(td, uap)
441 struct thread *td;
442 register struct getfsstat_args /* {
443 struct statfs *buf;
444 long bufsize;
445 int flags;
446 } */ *uap;
447 {
448
449 return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE,
450 uap->flags));
451 }
452
453 /*
454 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
455 * The caller is responsible for freeing memory which will be allocated
456 * in '*buf'.
457 */
458 int
459 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
460 enum uio_seg bufseg, int flags)
461 {
462 struct mount *mp, *nmp;
463 struct statfs *sfsp, *sp, sb;
464 size_t count, maxcount;
465 int vfslocked;
466 int error;
467
468 maxcount = bufsize / sizeof(struct statfs);
469 if (bufsize == 0)
470 sfsp = NULL;
471 else if (bufseg == UIO_USERSPACE)
472 sfsp = *buf;
473 else /* if (bufseg == UIO_SYSSPACE) */ {
474 count = 0;
475 mtx_lock(&mountlist_mtx);
476 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
477 count++;
478 }
479 mtx_unlock(&mountlist_mtx);
480 if (maxcount > count)
481 maxcount = count;
482 sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP,
483 M_WAITOK);
484 }
485 count = 0;
486 mtx_lock(&mountlist_mtx);
487 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
488 if (prison_canseemount(td->td_ucred, mp) != 0) {
489 nmp = TAILQ_NEXT(mp, mnt_list);
490 continue;
491 }
492 #ifdef MAC
493 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
494 nmp = TAILQ_NEXT(mp, mnt_list);
495 continue;
496 }
497 #endif
498 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
499 nmp = TAILQ_NEXT(mp, mnt_list);
500 continue;
501 }
502 vfslocked = VFS_LOCK_GIANT(mp);
503 if (sfsp && count < maxcount) {
504 sp = &mp->mnt_stat;
505 /*
506 * Set these in case the underlying filesystem
507 * fails to do so.
508 */
509 sp->f_version = STATFS_VERSION;
510 sp->f_namemax = NAME_MAX;
511 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
512 /*
513 * If MNT_NOWAIT or MNT_LAZY is specified, do not
514 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
515 * overrides MNT_WAIT.
516 */
517 if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
518 (flags & MNT_WAIT)) &&
519 (error = VFS_STATFS(mp, sp))) {
520 VFS_UNLOCK_GIANT(vfslocked);
521 mtx_lock(&mountlist_mtx);
522 nmp = TAILQ_NEXT(mp, mnt_list);
523 vfs_unbusy(mp);
524 continue;
525 }
526 if (priv_check(td, PRIV_VFS_GENERATION)) {
527 bcopy(sp, &sb, sizeof(sb));
528 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
529 prison_enforce_statfs(td->td_ucred, mp, &sb);
530 sp = &sb;
531 }
532 if (bufseg == UIO_SYSSPACE)
533 bcopy(sp, sfsp, sizeof(*sp));
534 else /* if (bufseg == UIO_USERSPACE) */ {
535 error = copyout(sp, sfsp, sizeof(*sp));
536 if (error) {
537 vfs_unbusy(mp);
538 VFS_UNLOCK_GIANT(vfslocked);
539 return (error);
540 }
541 }
542 sfsp++;
543 }
544 VFS_UNLOCK_GIANT(vfslocked);
545 count++;
546 mtx_lock(&mountlist_mtx);
547 nmp = TAILQ_NEXT(mp, mnt_list);
548 vfs_unbusy(mp);
549 }
550 mtx_unlock(&mountlist_mtx);
551 if (sfsp && count > maxcount)
552 td->td_retval[0] = maxcount;
553 else
554 td->td_retval[0] = count;
555 return (0);
556 }
557
558 #ifdef COMPAT_FREEBSD4
559 /*
560 * Get old format filesystem statistics.
561 */
562 static void cvtstatfs(struct statfs *, struct ostatfs *);
563
564 #ifndef _SYS_SYSPROTO_H_
565 struct freebsd4_statfs_args {
566 char *path;
567 struct ostatfs *buf;
568 };
569 #endif
570 int
571 freebsd4_statfs(td, uap)
572 struct thread *td;
573 struct freebsd4_statfs_args /* {
574 char *path;
575 struct ostatfs *buf;
576 } */ *uap;
577 {
578 struct ostatfs osb;
579 struct statfs sf;
580 int error;
581
582 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
583 if (error)
584 return (error);
585 cvtstatfs(&sf, &osb);
586 return (copyout(&osb, uap->buf, sizeof(osb)));
587 }
588
589 /*
590 * Get filesystem statistics.
591 */
592 #ifndef _SYS_SYSPROTO_H_
593 struct freebsd4_fstatfs_args {
594 int fd;
595 struct ostatfs *buf;
596 };
597 #endif
598 int
599 freebsd4_fstatfs(td, uap)
600 struct thread *td;
601 struct freebsd4_fstatfs_args /* {
602 int fd;
603 struct ostatfs *buf;
604 } */ *uap;
605 {
606 struct ostatfs osb;
607 struct statfs sf;
608 int error;
609
610 error = kern_fstatfs(td, uap->fd, &sf);
611 if (error)
612 return (error);
613 cvtstatfs(&sf, &osb);
614 return (copyout(&osb, uap->buf, sizeof(osb)));
615 }
616
617 /*
618 * Get statistics on all filesystems.
619 */
620 #ifndef _SYS_SYSPROTO_H_
621 struct freebsd4_getfsstat_args {
622 struct ostatfs *buf;
623 long bufsize;
624 int flags;
625 };
626 #endif
627 int
628 freebsd4_getfsstat(td, uap)
629 struct thread *td;
630 register struct freebsd4_getfsstat_args /* {
631 struct ostatfs *buf;
632 long bufsize;
633 int flags;
634 } */ *uap;
635 {
636 struct statfs *buf, *sp;
637 struct ostatfs osb;
638 size_t count, size;
639 int error;
640
641 count = uap->bufsize / sizeof(struct ostatfs);
642 size = count * sizeof(struct statfs);
643 error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags);
644 if (size > 0) {
645 count = td->td_retval[0];
646 sp = buf;
647 while (count > 0 && error == 0) {
648 cvtstatfs(sp, &osb);
649 error = copyout(&osb, uap->buf, sizeof(osb));
650 sp++;
651 uap->buf++;
652 count--;
653 }
654 free(buf, M_TEMP);
655 }
656 return (error);
657 }
658
659 /*
660 * Implement fstatfs() for (NFS) file handles.
661 */
662 #ifndef _SYS_SYSPROTO_H_
663 struct freebsd4_fhstatfs_args {
664 struct fhandle *u_fhp;
665 struct ostatfs *buf;
666 };
667 #endif
668 int
669 freebsd4_fhstatfs(td, uap)
670 struct thread *td;
671 struct freebsd4_fhstatfs_args /* {
672 struct fhandle *u_fhp;
673 struct ostatfs *buf;
674 } */ *uap;
675 {
676 struct ostatfs osb;
677 struct statfs sf;
678 fhandle_t fh;
679 int error;
680
681 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
682 if (error)
683 return (error);
684 error = kern_fhstatfs(td, fh, &sf);
685 if (error)
686 return (error);
687 cvtstatfs(&sf, &osb);
688 return (copyout(&osb, uap->buf, sizeof(osb)));
689 }
690
691 /*
692 * Convert a new format statfs structure to an old format statfs structure.
693 */
694 static void
695 cvtstatfs(nsp, osp)
696 struct statfs *nsp;
697 struct ostatfs *osp;
698 {
699
700 statfs_scale_blocks(nsp, LONG_MAX);
701 bzero(osp, sizeof(*osp));
702 osp->f_bsize = nsp->f_bsize;
703 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
704 osp->f_blocks = nsp->f_blocks;
705 osp->f_bfree = nsp->f_bfree;
706 osp->f_bavail = nsp->f_bavail;
707 osp->f_files = MIN(nsp->f_files, LONG_MAX);
708 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
709 osp->f_owner = nsp->f_owner;
710 osp->f_type = nsp->f_type;
711 osp->f_flags = nsp->f_flags;
712 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
713 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
714 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
715 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
716 strlcpy(osp->f_fstypename, nsp->f_fstypename,
717 MIN(MFSNAMELEN, OMFSNAMELEN));
718 strlcpy(osp->f_mntonname, nsp->f_mntonname,
719 MIN(MNAMELEN, OMNAMELEN));
720 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
721 MIN(MNAMELEN, OMNAMELEN));
722 osp->f_fsid = nsp->f_fsid;
723 }
724 #endif /* COMPAT_FREEBSD4 */
725
726 /*
727 * Change current working directory to a given file descriptor.
728 */
729 #ifndef _SYS_SYSPROTO_H_
730 struct fchdir_args {
731 int fd;
732 };
733 #endif
734 int
735 fchdir(td, uap)
736 struct thread *td;
737 struct fchdir_args /* {
738 int fd;
739 } */ *uap;
740 {
741 register struct filedesc *fdp = td->td_proc->p_fd;
742 struct vnode *vp, *tdp, *vpold;
743 struct mount *mp;
744 struct file *fp;
745 int vfslocked;
746 int error;
747
748 AUDIT_ARG_FD(uap->fd);
749 if ((error = getvnode(fdp, uap->fd, &fp)) != 0)
750 return (error);
751 vp = fp->f_vnode;
752 VREF(vp);
753 fdrop(fp, td);
754 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
755 vn_lock(vp, LK_SHARED | LK_RETRY);
756 AUDIT_ARG_VNODE1(vp);
757 error = change_dir(vp, td);
758 while (!error && (mp = vp->v_mountedhere) != NULL) {
759 int tvfslocked;
760 if (vfs_busy(mp, 0))
761 continue;
762 tvfslocked = VFS_LOCK_GIANT(mp);
763 error = VFS_ROOT(mp, LK_SHARED, &tdp);
764 vfs_unbusy(mp);
765 if (error) {
766 VFS_UNLOCK_GIANT(tvfslocked);
767 break;
768 }
769 vput(vp);
770 VFS_UNLOCK_GIANT(vfslocked);
771 vp = tdp;
772 vfslocked = tvfslocked;
773 }
774 if (error) {
775 vput(vp);
776 VFS_UNLOCK_GIANT(vfslocked);
777 return (error);
778 }
779 VOP_UNLOCK(vp, 0);
780 VFS_UNLOCK_GIANT(vfslocked);
781 FILEDESC_XLOCK(fdp);
782 vpold = fdp->fd_cdir;
783 fdp->fd_cdir = vp;
784 FILEDESC_XUNLOCK(fdp);
785 vfslocked = VFS_LOCK_GIANT(vpold->v_mount);
786 vrele(vpold);
787 VFS_UNLOCK_GIANT(vfslocked);
788 return (0);
789 }
790
791 /*
792 * Change current working directory (``.'').
793 */
794 #ifndef _SYS_SYSPROTO_H_
795 struct chdir_args {
796 char *path;
797 };
798 #endif
799 int
800 chdir(td, uap)
801 struct thread *td;
802 struct chdir_args /* {
803 char *path;
804 } */ *uap;
805 {
806
807 return (kern_chdir(td, uap->path, UIO_USERSPACE));
808 }
809
810 int
811 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
812 {
813 register struct filedesc *fdp = td->td_proc->p_fd;
814 int error;
815 struct nameidata nd;
816 struct vnode *vp;
817 int vfslocked;
818
819 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 |
820 MPSAFE, pathseg, path, td);
821 if ((error = namei(&nd)) != 0)
822 return (error);
823 vfslocked = NDHASGIANT(&nd);
824 if ((error = change_dir(nd.ni_vp, td)) != 0) {
825 vput(nd.ni_vp);
826 VFS_UNLOCK_GIANT(vfslocked);
827 NDFREE(&nd, NDF_ONLY_PNBUF);
828 return (error);
829 }
830 VOP_UNLOCK(nd.ni_vp, 0);
831 VFS_UNLOCK_GIANT(vfslocked);
832 NDFREE(&nd, NDF_ONLY_PNBUF);
833 FILEDESC_XLOCK(fdp);
834 vp = fdp->fd_cdir;
835 fdp->fd_cdir = nd.ni_vp;
836 FILEDESC_XUNLOCK(fdp);
837 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
838 vrele(vp);
839 VFS_UNLOCK_GIANT(vfslocked);
840 return (0);
841 }
842
843 /*
844 * Helper function for raised chroot(2) security function: Refuse if
845 * any filedescriptors are open directories.
846 */
847 static int
848 chroot_refuse_vdir_fds(fdp)
849 struct filedesc *fdp;
850 {
851 struct vnode *vp;
852 struct file *fp;
853 int fd;
854
855 FILEDESC_LOCK_ASSERT(fdp);
856
857 for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
858 fp = fget_locked(fdp, fd);
859 if (fp == NULL)
860 continue;
861 if (fp->f_type == DTYPE_VNODE) {
862 vp = fp->f_vnode;
863 if (vp->v_type == VDIR)
864 return (EPERM);
865 }
866 }
867 return (0);
868 }
869
870 /*
871 * This sysctl determines if we will allow a process to chroot(2) if it
872 * has a directory open:
873 * 0: disallowed for all processes.
874 * 1: allowed for processes that were not already chroot(2)'ed.
875 * 2: allowed for all processes.
876 */
877
878 static int chroot_allow_open_directories = 1;
879
880 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
881 &chroot_allow_open_directories, 0, "");
882
883 /*
884 * Change notion of root (``/'') directory.
885 */
886 #ifndef _SYS_SYSPROTO_H_
887 struct chroot_args {
888 char *path;
889 };
890 #endif
891 int
892 chroot(td, uap)
893 struct thread *td;
894 struct chroot_args /* {
895 char *path;
896 } */ *uap;
897 {
898 int error;
899 struct nameidata nd;
900 int vfslocked;
901
902 error = priv_check(td, PRIV_VFS_CHROOT);
903 if (error)
904 return (error);
905 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
906 AUDITVNODE1, UIO_USERSPACE, uap->path, td);
907 error = namei(&nd);
908 if (error)
909 goto error;
910 vfslocked = NDHASGIANT(&nd);
911 if ((error = change_dir(nd.ni_vp, td)) != 0)
912 goto e_vunlock;
913 #ifdef MAC
914 if ((error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp)))
915 goto e_vunlock;
916 #endif
917 VOP_UNLOCK(nd.ni_vp, 0);
918 error = change_root(nd.ni_vp, td);
919 vrele(nd.ni_vp);
920 VFS_UNLOCK_GIANT(vfslocked);
921 NDFREE(&nd, NDF_ONLY_PNBUF);
922 return (error);
923 e_vunlock:
924 vput(nd.ni_vp);
925 VFS_UNLOCK_GIANT(vfslocked);
926 error:
927 NDFREE(&nd, NDF_ONLY_PNBUF);
928 return (error);
929 }
930
931 /*
932 * Common routine for chroot and chdir. Callers must provide a locked vnode
933 * instance.
934 */
935 int
936 change_dir(vp, td)
937 struct vnode *vp;
938 struct thread *td;
939 {
940 int error;
941
942 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
943 if (vp->v_type != VDIR)
944 return (ENOTDIR);
945 #ifdef MAC
946 error = mac_vnode_check_chdir(td->td_ucred, vp);
947 if (error)
948 return (error);
949 #endif
950 error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
951 return (error);
952 }
953
954 /*
955 * Common routine for kern_chroot() and jail_attach(). The caller is
956 * responsible for invoking priv_check() and mac_vnode_check_chroot() to
957 * authorize this operation.
958 */
959 int
960 change_root(vp, td)
961 struct vnode *vp;
962 struct thread *td;
963 {
964 struct filedesc *fdp;
965 struct vnode *oldvp;
966 int vfslocked;
967 int error;
968
969 VFS_ASSERT_GIANT(vp->v_mount);
970 fdp = td->td_proc->p_fd;
971 FILEDESC_XLOCK(fdp);
972 if (chroot_allow_open_directories == 0 ||
973 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
974 error = chroot_refuse_vdir_fds(fdp);
975 if (error) {
976 FILEDESC_XUNLOCK(fdp);
977 return (error);
978 }
979 }
980 oldvp = fdp->fd_rdir;
981 fdp->fd_rdir = vp;
982 VREF(fdp->fd_rdir);
983 if (!fdp->fd_jdir) {
984 fdp->fd_jdir = vp;
985 VREF(fdp->fd_jdir);
986 }
987 FILEDESC_XUNLOCK(fdp);
988 vfslocked = VFS_LOCK_GIANT(oldvp->v_mount);
989 vrele(oldvp);
990 VFS_UNLOCK_GIANT(vfslocked);
991 return (0);
992 }
993
994 /*
995 * Check permissions, allocate an open file structure, and call the device
996 * open routine if any.
997 */
998 #ifndef _SYS_SYSPROTO_H_
999 struct open_args {
1000 char *path;
1001 int flags;
1002 int mode;
1003 };
1004 #endif
1005 int
1006 open(td, uap)
1007 struct thread *td;
1008 register struct open_args /* {
1009 char *path;
1010 int flags;
1011 int mode;
1012 } */ *uap;
1013 {
1014
1015 return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
1016 }
1017
1018 #ifndef _SYS_SYSPROTO_H_
1019 struct openat_args {
1020 int fd;
1021 char *path;
1022 int flag;
1023 int mode;
1024 };
1025 #endif
1026 int
1027 openat(struct thread *td, struct openat_args *uap)
1028 {
1029
1030 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1031 uap->mode));
1032 }
1033
1034 int
1035 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
1036 int mode)
1037 {
1038
1039 return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode));
1040 }
1041
1042 int
1043 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1044 int flags, int mode)
1045 {
1046 struct proc *p = td->td_proc;
1047 struct filedesc *fdp = p->p_fd;
1048 struct file *fp;
1049 struct vnode *vp;
1050 int cmode;
1051 struct file *nfp;
1052 int type, indx, error;
1053 struct flock lf;
1054 struct nameidata nd;
1055 int vfslocked;
1056
1057 AUDIT_ARG_FFLAGS(flags);
1058 AUDIT_ARG_MODE(mode);
1059 /* XXX: audit dirfd */
1060 /*
1061 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR may
1062 * be specified.
1063 */
1064 if (flags & O_EXEC) {
1065 if (flags & O_ACCMODE)
1066 return (EINVAL);
1067 } else if ((flags & O_ACCMODE) == O_ACCMODE)
1068 return (EINVAL);
1069 else
1070 flags = FFLAGS(flags);
1071
1072 error = falloc(td, &nfp, &indx);
1073 if (error)
1074 return (error);
1075 /* An extra reference on `nfp' has been held for us by falloc(). */
1076 fp = nfp;
1077 /* Set the flags early so the finit in devfs can pick them up. */
1078 fp->f_flag = flags & FMASK;
1079 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
1080 NDINIT_AT(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | MPSAFE, pathseg, path, fd,
1081 td);
1082 td->td_dupfd = -1; /* XXX check for fdopen */
1083 error = vn_open(&nd, &flags, cmode, fp);
1084 if (error) {
1085 /*
1086 * If the vn_open replaced the method vector, something
1087 * wonderous happened deep below and we just pass it up
1088 * pretending we know what we do.
1089 */
1090 if (error == ENXIO && fp->f_ops != &badfileops) {
1091 fdrop(fp, td);
1092 td->td_retval[0] = indx;
1093 return (0);
1094 }
1095
1096 /*
1097 * handle special fdopen() case. bleh. dupfdopen() is
1098 * responsible for dropping the old contents of ofiles[indx]
1099 * if it succeeds.
1100 */
1101 if ((error == ENODEV || error == ENXIO) &&
1102 td->td_dupfd >= 0 && /* XXX from fdopen */
1103 (error =
1104 dupfdopen(td, fdp, indx, td->td_dupfd, flags, error)) == 0) {
1105 td->td_retval[0] = indx;
1106 fdrop(fp, td);
1107 return (0);
1108 }
1109 /*
1110 * Clean up the descriptor, but only if another thread hadn't
1111 * replaced or closed it.
1112 */
1113 fdclose(fdp, fp, indx, td);
1114 fdrop(fp, td);
1115
1116 if (error == ERESTART)
1117 error = EINTR;
1118 return (error);
1119 }
1120 td->td_dupfd = 0;
1121 vfslocked = NDHASGIANT(&nd);
1122 NDFREE(&nd, NDF_ONLY_PNBUF);
1123 vp = nd.ni_vp;
1124
1125 /*
1126 * Store the vnode, for any f_type. Typically, the vnode use
1127 * count is decremented by direct call to vn_closefile() for
1128 * files that switched type in the cdevsw fdopen() method.
1129 */
1130 fp->f_vnode = vp;
1131 /*
1132 * If the file wasn't claimed by devfs bind it to the normal
1133 * vnode operations here.
1134 */
1135 if (fp->f_ops == &badfileops) {
1136 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
1137 fp->f_seqcount = 1;
1138 finit(fp, flags & FMASK, DTYPE_VNODE, vp, &vnops);
1139 }
1140
1141 VOP_UNLOCK(vp, 0);
1142 if (fp->f_type == DTYPE_VNODE && (flags & (O_EXLOCK | O_SHLOCK)) != 0) {
1143 lf.l_whence = SEEK_SET;
1144 lf.l_start = 0;
1145 lf.l_len = 0;
1146 if (flags & O_EXLOCK)
1147 lf.l_type = F_WRLCK;
1148 else
1149 lf.l_type = F_RDLCK;
1150 type = F_FLOCK;
1151 if ((flags & FNONBLOCK) == 0)
1152 type |= F_WAIT;
1153 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
1154 type)) != 0)
1155 goto bad;
1156 atomic_set_int(&fp->f_flag, FHASLOCK);
1157 }
1158 if (flags & O_TRUNC) {
1159 error = fo_truncate(fp, 0, td->td_ucred, td);
1160 if (error)
1161 goto bad;
1162 }
1163 VFS_UNLOCK_GIANT(vfslocked);
1164 /*
1165 * Release our private reference, leaving the one associated with
1166 * the descriptor table intact.
1167 */
1168 fdrop(fp, td);
1169 td->td_retval[0] = indx;
1170 return (0);
1171 bad:
1172 VFS_UNLOCK_GIANT(vfslocked);
1173 fdclose(fdp, fp, indx, td);
1174 fdrop(fp, td);
1175 return (error);
1176 }
1177
1178 #ifdef COMPAT_43
1179 /*
1180 * Create a file.
1181 */
1182 #ifndef _SYS_SYSPROTO_H_
1183 struct ocreat_args {
1184 char *path;
1185 int mode;
1186 };
1187 #endif
1188 int
1189 ocreat(td, uap)
1190 struct thread *td;
1191 register struct ocreat_args /* {
1192 char *path;
1193 int mode;
1194 } */ *uap;
1195 {
1196
1197 return (kern_open(td, uap->path, UIO_USERSPACE,
1198 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1199 }
1200 #endif /* COMPAT_43 */
1201
1202 /*
1203 * Create a special file.
1204 */
1205 #ifndef _SYS_SYSPROTO_H_
1206 struct mknod_args {
1207 char *path;
1208 int mode;
1209 int dev;
1210 };
1211 #endif
1212 int
1213 mknod(td, uap)
1214 struct thread *td;
1215 register struct mknod_args /* {
1216 char *path;
1217 int mode;
1218 int dev;
1219 } */ *uap;
1220 {
1221
1222 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
1223 }
1224
1225 #ifndef _SYS_SYSPROTO_H_
1226 struct mknodat_args {
1227 int fd;
1228 char *path;
1229 mode_t mode;
1230 dev_t dev;
1231 };
1232 #endif
1233 int
1234 mknodat(struct thread *td, struct mknodat_args *uap)
1235 {
1236
1237 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1238 uap->dev));
1239 }
1240
1241 int
1242 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
1243 int dev)
1244 {
1245
1246 return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev));
1247 }
1248
1249 int
1250 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1251 int mode, int dev)
1252 {
1253 struct vnode *vp;
1254 struct mount *mp;
1255 struct vattr vattr;
1256 int error;
1257 int whiteout = 0;
1258 struct nameidata nd;
1259 int vfslocked;
1260
1261 AUDIT_ARG_MODE(mode);
1262 AUDIT_ARG_DEV(dev);
1263 switch (mode & S_IFMT) {
1264 case S_IFCHR:
1265 case S_IFBLK:
1266 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1267 break;
1268 case S_IFMT:
1269 error = priv_check(td, PRIV_VFS_MKNOD_BAD);
1270 break;
1271 case S_IFWHT:
1272 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1273 break;
1274 case S_IFIFO:
1275 if (dev == 0)
1276 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1277 /* FALLTHROUGH */
1278 default:
1279 error = EINVAL;
1280 break;
1281 }
1282 if (error)
1283 return (error);
1284 restart:
1285 bwillwrite();
1286 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1,
1287 pathseg, path, fd, td);
1288 if ((error = namei(&nd)) != 0)
1289 return (error);
1290 vfslocked = NDHASGIANT(&nd);
1291 vp = nd.ni_vp;
1292 if (vp != NULL) {
1293 NDFREE(&nd, NDF_ONLY_PNBUF);
1294 if (vp == nd.ni_dvp)
1295 vrele(nd.ni_dvp);
1296 else
1297 vput(nd.ni_dvp);
1298 vrele(vp);
1299 VFS_UNLOCK_GIANT(vfslocked);
1300 return (EEXIST);
1301 } else {
1302 VATTR_NULL(&vattr);
1303 vattr.va_mode = (mode & ALLPERMS) &
1304 ~td->td_proc->p_fd->fd_cmask;
1305 vattr.va_rdev = dev;
1306 whiteout = 0;
1307
1308 switch (mode & S_IFMT) {
1309 case S_IFMT: /* used by badsect to flag bad sectors */
1310 vattr.va_type = VBAD;
1311 break;
1312 case S_IFCHR:
1313 vattr.va_type = VCHR;
1314 break;
1315 case S_IFBLK:
1316 vattr.va_type = VBLK;
1317 break;
1318 case S_IFWHT:
1319 whiteout = 1;
1320 break;
1321 default:
1322 panic("kern_mknod: invalid mode");
1323 }
1324 }
1325 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1326 NDFREE(&nd, NDF_ONLY_PNBUF);
1327 vput(nd.ni_dvp);
1328 VFS_UNLOCK_GIANT(vfslocked);
1329 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1330 return (error);
1331 goto restart;
1332 }
1333 #ifdef MAC
1334 if (error == 0 && !whiteout)
1335 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1336 &nd.ni_cnd, &vattr);
1337 #endif
1338 if (!error) {
1339 if (whiteout)
1340 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1341 else {
1342 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1343 &nd.ni_cnd, &vattr);
1344 if (error == 0)
1345 vput(nd.ni_vp);
1346 }
1347 }
1348 NDFREE(&nd, NDF_ONLY_PNBUF);
1349 vput(nd.ni_dvp);
1350 vn_finished_write(mp);
1351 VFS_UNLOCK_GIANT(vfslocked);
1352 return (error);
1353 }
1354
1355 /*
1356 * Create a named pipe.
1357 */
1358 #ifndef _SYS_SYSPROTO_H_
1359 struct mkfifo_args {
1360 char *path;
1361 int mode;
1362 };
1363 #endif
1364 int
1365 mkfifo(td, uap)
1366 struct thread *td;
1367 register struct mkfifo_args /* {
1368 char *path;
1369 int mode;
1370 } */ *uap;
1371 {
1372
1373 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
1374 }
1375
1376 #ifndef _SYS_SYSPROTO_H_
1377 struct mkfifoat_args {
1378 int fd;
1379 char *path;
1380 mode_t mode;
1381 };
1382 #endif
1383 int
1384 mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1385 {
1386
1387 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1388 uap->mode));
1389 }
1390
1391 int
1392 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
1393 {
1394
1395 return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode));
1396 }
1397
1398 int
1399 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1400 int mode)
1401 {
1402 struct mount *mp;
1403 struct vattr vattr;
1404 int error;
1405 struct nameidata nd;
1406 int vfslocked;
1407
1408 AUDIT_ARG_MODE(mode);
1409 restart:
1410 bwillwrite();
1411 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1,
1412 pathseg, path, fd, td);
1413 if ((error = namei(&nd)) != 0)
1414 return (error);
1415 vfslocked = NDHASGIANT(&nd);
1416 if (nd.ni_vp != NULL) {
1417 NDFREE(&nd, NDF_ONLY_PNBUF);
1418 if (nd.ni_vp == nd.ni_dvp)
1419 vrele(nd.ni_dvp);
1420 else
1421 vput(nd.ni_dvp);
1422 vrele(nd.ni_vp);
1423 VFS_UNLOCK_GIANT(vfslocked);
1424 return (EEXIST);
1425 }
1426 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1427 NDFREE(&nd, NDF_ONLY_PNBUF);
1428 vput(nd.ni_dvp);
1429 VFS_UNLOCK_GIANT(vfslocked);
1430 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1431 return (error);
1432 goto restart;
1433 }
1434 VATTR_NULL(&vattr);
1435 vattr.va_type = VFIFO;
1436 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1437 #ifdef MAC
1438 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1439 &vattr);
1440 if (error)
1441 goto out;
1442 #endif
1443 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1444 if (error == 0)
1445 vput(nd.ni_vp);
1446 #ifdef MAC
1447 out:
1448 #endif
1449 vput(nd.ni_dvp);
1450 vn_finished_write(mp);
1451 VFS_UNLOCK_GIANT(vfslocked);
1452 NDFREE(&nd, NDF_ONLY_PNBUF);
1453 return (error);
1454 }
1455
1456 /*
1457 * Make a hard file link.
1458 */
1459 #ifndef _SYS_SYSPROTO_H_
1460 struct link_args {
1461 char *path;
1462 char *link;
1463 };
1464 #endif
1465 int
1466 link(td, uap)
1467 struct thread *td;
1468 register struct link_args /* {
1469 char *path;
1470 char *link;
1471 } */ *uap;
1472 {
1473
1474 return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
1475 }
1476
1477 #ifndef _SYS_SYSPROTO_H_
1478 struct linkat_args {
1479 int fd1;
1480 char *path1;
1481 int fd2;
1482 char *path2;
1483 int flag;
1484 };
1485 #endif
1486 int
1487 linkat(struct thread *td, struct linkat_args *uap)
1488 {
1489 int flag;
1490
1491 flag = uap->flag;
1492 if (flag & ~AT_SYMLINK_FOLLOW)
1493 return (EINVAL);
1494
1495 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1496 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1497 }
1498
1499 int hardlink_check_uid = 0;
1500 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1501 &hardlink_check_uid, 0,
1502 "Unprivileged processes cannot create hard links to files owned by other "
1503 "users");
1504 static int hardlink_check_gid = 0;
1505 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1506 &hardlink_check_gid, 0,
1507 "Unprivileged processes cannot create hard links to files owned by other "
1508 "groups");
1509
1510 static int
1511 can_hardlink(struct vnode *vp, struct ucred *cred)
1512 {
1513 struct vattr va;
1514 int error;
1515
1516 if (!hardlink_check_uid && !hardlink_check_gid)
1517 return (0);
1518
1519 error = VOP_GETATTR(vp, &va, cred);
1520 if (error != 0)
1521 return (error);
1522
1523 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1524 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1525 if (error)
1526 return (error);
1527 }
1528
1529 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1530 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1531 if (error)
1532 return (error);
1533 }
1534
1535 return (0);
1536 }
1537
1538 int
1539 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
1540 {
1541
1542 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW));
1543 }
1544
1545 int
1546 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1547 enum uio_seg segflg, int follow)
1548 {
1549 struct vnode *vp;
1550 struct mount *mp;
1551 struct nameidata nd;
1552 int vfslocked;
1553 int lvfslocked;
1554 int error;
1555
1556 bwillwrite();
1557 NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, segflg, path1,
1558 fd1, td);
1559
1560 if ((error = namei(&nd)) != 0)
1561 return (error);
1562 vfslocked = NDHASGIANT(&nd);
1563 NDFREE(&nd, NDF_ONLY_PNBUF);
1564 vp = nd.ni_vp;
1565 if (vp->v_type == VDIR) {
1566 vrele(vp);
1567 VFS_UNLOCK_GIANT(vfslocked);
1568 return (EPERM); /* POSIX */
1569 }
1570 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
1571 vrele(vp);
1572 VFS_UNLOCK_GIANT(vfslocked);
1573 return (error);
1574 }
1575 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE2,
1576 segflg, path2, fd2, td);
1577 if ((error = namei(&nd)) == 0) {
1578 lvfslocked = NDHASGIANT(&nd);
1579 if (nd.ni_vp != NULL) {
1580 if (nd.ni_dvp == nd.ni_vp)
1581 vrele(nd.ni_dvp);
1582 else
1583 vput(nd.ni_dvp);
1584 vrele(nd.ni_vp);
1585 error = EEXIST;
1586 } else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY))
1587 == 0) {
1588 error = can_hardlink(vp, td->td_ucred);
1589 if (error == 0)
1590 #ifdef MAC
1591 error = mac_vnode_check_link(td->td_ucred,
1592 nd.ni_dvp, vp, &nd.ni_cnd);
1593 if (error == 0)
1594 #endif
1595 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1596 VOP_UNLOCK(vp, 0);
1597 vput(nd.ni_dvp);
1598 }
1599 NDFREE(&nd, NDF_ONLY_PNBUF);
1600 VFS_UNLOCK_GIANT(lvfslocked);
1601 }
1602 vrele(vp);
1603 vn_finished_write(mp);
1604 VFS_UNLOCK_GIANT(vfslocked);
1605 return (error);
1606 }
1607
1608 /*
1609 * Make a symbolic link.
1610 */
1611 #ifndef _SYS_SYSPROTO_H_
1612 struct symlink_args {
1613 char *path;
1614 char *link;
1615 };
1616 #endif
1617 int
1618 symlink(td, uap)
1619 struct thread *td;
1620 register struct symlink_args /* {
1621 char *path;
1622 char *link;
1623 } */ *uap;
1624 {
1625
1626 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
1627 }
1628
1629 #ifndef _SYS_SYSPROTO_H_
1630 struct symlinkat_args {
1631 char *path;
1632 int fd;
1633 char *path2;
1634 };
1635 #endif
1636 int
1637 symlinkat(struct thread *td, struct symlinkat_args *uap)
1638 {
1639
1640 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1641 UIO_USERSPACE));
1642 }
1643
1644 int
1645 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
1646 {
1647
1648 return (kern_symlinkat(td, path, AT_FDCWD, link, segflg));
1649 }
1650
1651 int
1652 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1653 enum uio_seg segflg)
1654 {
1655 struct mount *mp;
1656 struct vattr vattr;
1657 char *syspath;
1658 int error;
1659 struct nameidata nd;
1660 int vfslocked;
1661
1662 if (segflg == UIO_SYSSPACE) {
1663 syspath = path1;
1664 } else {
1665 syspath = uma_zalloc(namei_zone, M_WAITOK);
1666 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1667 goto out;
1668 }
1669 AUDIT_ARG_TEXT(syspath);
1670 restart:
1671 bwillwrite();
1672 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1,
1673 segflg, path2, fd, td);
1674 if ((error = namei(&nd)) != 0)
1675 goto out;
1676 vfslocked = NDHASGIANT(&nd);
1677 if (nd.ni_vp) {
1678 NDFREE(&nd, NDF_ONLY_PNBUF);
1679 if (nd.ni_vp == nd.ni_dvp)
1680 vrele(nd.ni_dvp);
1681 else
1682 vput(nd.ni_dvp);
1683 vrele(nd.ni_vp);
1684 VFS_UNLOCK_GIANT(vfslocked);
1685 error = EEXIST;
1686 goto out;
1687 }
1688 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1689 NDFREE(&nd, NDF_ONLY_PNBUF);
1690 vput(nd.ni_dvp);
1691 VFS_UNLOCK_GIANT(vfslocked);
1692 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1693 goto out;
1694 goto restart;
1695 }
1696 VATTR_NULL(&vattr);
1697 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1698 #ifdef MAC
1699 vattr.va_type = VLNK;
1700 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1701 &vattr);
1702 if (error)
1703 goto out2;
1704 #endif
1705 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1706 if (error == 0)
1707 vput(nd.ni_vp);
1708 #ifdef MAC
1709 out2:
1710 #endif
1711 NDFREE(&nd, NDF_ONLY_PNBUF);
1712 vput(nd.ni_dvp);
1713 vn_finished_write(mp);
1714 VFS_UNLOCK_GIANT(vfslocked);
1715 out:
1716 if (segflg != UIO_SYSSPACE)
1717 uma_zfree(namei_zone, syspath);
1718 return (error);
1719 }
1720
1721 /*
1722 * Delete a whiteout from the filesystem.
1723 */
1724 int
1725 undelete(td, uap)
1726 struct thread *td;
1727 register struct undelete_args /* {
1728 char *path;
1729 } */ *uap;
1730 {
1731 int error;
1732 struct mount *mp;
1733 struct nameidata nd;
1734 int vfslocked;
1735
1736 restart:
1737 bwillwrite();
1738 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | MPSAFE | AUDITVNODE1,
1739 UIO_USERSPACE, uap->path, td);
1740 error = namei(&nd);
1741 if (error)
1742 return (error);
1743 vfslocked = NDHASGIANT(&nd);
1744
1745 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1746 NDFREE(&nd, NDF_ONLY_PNBUF);
1747 if (nd.ni_vp == nd.ni_dvp)
1748 vrele(nd.ni_dvp);
1749 else
1750 vput(nd.ni_dvp);
1751 if (nd.ni_vp)
1752 vrele(nd.ni_vp);
1753 VFS_UNLOCK_GIANT(vfslocked);
1754 return (EEXIST);
1755 }
1756 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1757 NDFREE(&nd, NDF_ONLY_PNBUF);
1758 vput(nd.ni_dvp);
1759 VFS_UNLOCK_GIANT(vfslocked);
1760 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1761 return (error);
1762 goto restart;
1763 }
1764 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1765 NDFREE(&nd, NDF_ONLY_PNBUF);
1766 vput(nd.ni_dvp);
1767 vn_finished_write(mp);
1768 VFS_UNLOCK_GIANT(vfslocked);
1769 return (error);
1770 }
1771
1772 /*
1773 * Delete a name from the filesystem.
1774 */
1775 #ifndef _SYS_SYSPROTO_H_
1776 struct unlink_args {
1777 char *path;
1778 };
1779 #endif
1780 int
1781 unlink(td, uap)
1782 struct thread *td;
1783 struct unlink_args /* {
1784 char *path;
1785 } */ *uap;
1786 {
1787
1788 return (kern_unlink(td, uap->path, UIO_USERSPACE));
1789 }
1790
1791 #ifndef _SYS_SYSPROTO_H_
1792 struct unlinkat_args {
1793 int fd;
1794 char *path;
1795 int flag;
1796 };
1797 #endif
1798 int
1799 unlinkat(struct thread *td, struct unlinkat_args *uap)
1800 {
1801 int flag = uap->flag;
1802 int fd = uap->fd;
1803 char *path = uap->path;
1804
1805 if (flag & ~AT_REMOVEDIR)
1806 return (EINVAL);
1807
1808 if (flag & AT_REMOVEDIR)
1809 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1810 else
1811 return (kern_unlinkat(td, fd, path, UIO_USERSPACE));
1812 }
1813
1814 int
1815 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
1816 {
1817
1818 return (kern_unlinkat(td, AT_FDCWD, path, pathseg));
1819 }
1820
1821 int
1822 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
1823 {
1824 struct mount *mp;
1825 struct vnode *vp;
1826 int error;
1827 struct nameidata nd;
1828 int vfslocked;
1829
1830 restart:
1831 bwillwrite();
1832 NDINIT_AT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1,
1833 pathseg, path, fd, td);
1834 if ((error = namei(&nd)) != 0)
1835 return (error == EINVAL ? EPERM : error);
1836 vfslocked = NDHASGIANT(&nd);
1837 vp = nd.ni_vp;
1838 if (vp->v_type == VDIR)
1839 error = EPERM; /* POSIX */
1840 else {
1841 /*
1842 * The root of a mounted filesystem cannot be deleted.
1843 *
1844 * XXX: can this only be a VDIR case?
1845 */
1846 if (vp->v_vflag & VV_ROOT)
1847 error = EBUSY;
1848 }
1849 if (error == 0) {
1850 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1851 NDFREE(&nd, NDF_ONLY_PNBUF);
1852 vput(nd.ni_dvp);
1853 if (vp == nd.ni_dvp)
1854 vrele(vp);
1855 else
1856 vput(vp);
1857 VFS_UNLOCK_GIANT(vfslocked);
1858 if ((error = vn_start_write(NULL, &mp,
1859 V_XSLEEP | PCATCH)) != 0)
1860 return (error);
1861 goto restart;
1862 }
1863 #ifdef MAC
1864 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1865 &nd.ni_cnd);
1866 if (error)
1867 goto out;
1868 #endif
1869 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1870 #ifdef MAC
1871 out:
1872 #endif
1873 vn_finished_write(mp);
1874 }
1875 NDFREE(&nd, NDF_ONLY_PNBUF);
1876 vput(nd.ni_dvp);
1877 if (vp == nd.ni_dvp)
1878 vrele(vp);
1879 else
1880 vput(vp);
1881 VFS_UNLOCK_GIANT(vfslocked);
1882 return (error);
1883 }
1884
1885 /*
1886 * Reposition read/write file offset.
1887 */
1888 #ifndef _SYS_SYSPROTO_H_
1889 struct lseek_args {
1890 int fd;
1891 int pad;
1892 off_t offset;
1893 int whence;
1894 };
1895 #endif
1896 int
1897 lseek(td, uap)
1898 struct thread *td;
1899 register struct lseek_args /* {
1900 int fd;
1901 int pad;
1902 off_t offset;
1903 int whence;
1904 } */ *uap;
1905 {
1906 struct ucred *cred = td->td_ucred;
1907 struct file *fp;
1908 struct vnode *vp;
1909 struct vattr vattr;
1910 off_t offset, size;
1911 int error, noneg;
1912 int vfslocked;
1913
1914 AUDIT_ARG_FD(uap->fd);
1915 if ((error = fget(td, uap->fd, &fp)) != 0)
1916 return (error);
1917 if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) {
1918 fdrop(fp, td);
1919 return (ESPIPE);
1920 }
1921 vp = fp->f_vnode;
1922 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1923 noneg = (vp->v_type != VCHR);
1924 offset = uap->offset;
1925 switch (uap->whence) {
1926 case L_INCR:
1927 if (noneg &&
1928 (fp->f_offset < 0 ||
1929 (offset > 0 && fp->f_offset > OFF_MAX - offset))) {
1930 error = EOVERFLOW;
1931 break;
1932 }
1933 offset += fp->f_offset;
1934 break;
1935 case L_XTND:
1936 vn_lock(vp, LK_SHARED | LK_RETRY);
1937 error = VOP_GETATTR(vp, &vattr, cred);
1938 VOP_UNLOCK(vp, 0);
1939 if (error)
1940 break;
1941
1942 /*
1943 * If the file references a disk device, then fetch
1944 * the media size and use that to determine the ending
1945 * offset.
1946 */
1947 if (vattr.va_size == 0 && vp->v_type == VCHR &&
1948 fo_ioctl(fp, DIOCGMEDIASIZE, &size, cred, td) == 0)
1949 vattr.va_size = size;
1950 if (noneg &&
1951 (vattr.va_size > OFF_MAX ||
1952 (offset > 0 && vattr.va_size > OFF_MAX - offset))) {
1953 error = EOVERFLOW;
1954 break;
1955 }
1956 offset += vattr.va_size;
1957 break;
1958 case L_SET:
1959 break;
1960 case SEEK_DATA:
1961 error = fo_ioctl(fp, FIOSEEKDATA, &offset, cred, td);
1962 break;
1963 case SEEK_HOLE:
1964 error = fo_ioctl(fp, FIOSEEKHOLE, &offset, cred, td);
1965 break;
1966 default:
1967 error = EINVAL;
1968 }
1969 if (error == 0 && noneg && offset < 0)
1970 error = EINVAL;
1971 if (error != 0)
1972 goto drop;
1973 fp->f_offset = offset;
1974 *(off_t *)(td->td_retval) = fp->f_offset;
1975 drop:
1976 fdrop(fp, td);
1977 VFS_UNLOCK_GIANT(vfslocked);
1978 return (error);
1979 }
1980
1981 #if defined(COMPAT_43)
1982 /*
1983 * Reposition read/write file offset.
1984 */
1985 #ifndef _SYS_SYSPROTO_H_
1986 struct olseek_args {
1987 int fd;
1988 long offset;
1989 int whence;
1990 };
1991 #endif
1992 int
1993 olseek(td, uap)
1994 struct thread *td;
1995 register struct olseek_args /* {
1996 int fd;
1997 long offset;
1998 int whence;
1999 } */ *uap;
2000 {
2001 struct lseek_args /* {
2002 int fd;
2003 int pad;
2004 off_t offset;
2005 int whence;
2006 } */ nuap;
2007
2008 nuap.fd = uap->fd;
2009 nuap.offset = uap->offset;
2010 nuap.whence = uap->whence;
2011 return (lseek(td, &nuap));
2012 }
2013 #endif /* COMPAT_43 */
2014
2015 /* Version with the 'pad' argument */
2016 int
2017 freebsd6_lseek(td, uap)
2018 struct thread *td;
2019 register struct freebsd6_lseek_args *uap;
2020 {
2021 struct lseek_args ouap;
2022
2023 ouap.fd = uap->fd;
2024 ouap.offset = uap->offset;
2025 ouap.whence = uap->whence;
2026 return (lseek(td, &ouap));
2027 }
2028
2029 /*
2030 * Check access permissions using passed credentials.
2031 */
2032 static int
2033 vn_access(vp, user_flags, cred, td)
2034 struct vnode *vp;
2035 int user_flags;
2036 struct ucred *cred;
2037 struct thread *td;
2038 {
2039 int error;
2040 accmode_t accmode;
2041
2042 /* Flags == 0 means only check for existence. */
2043 error = 0;
2044 if (user_flags) {
2045 accmode = 0;
2046 if (user_flags & R_OK)
2047 accmode |= VREAD;
2048 if (user_flags & W_OK)
2049 accmode |= VWRITE;
2050 if (user_flags & X_OK)
2051 accmode |= VEXEC;
2052 #ifdef MAC
2053 error = mac_vnode_check_access(cred, vp, accmode);
2054 if (error)
2055 return (error);
2056 #endif
2057 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
2058 error = VOP_ACCESS(vp, accmode, cred, td);
2059 }
2060 return (error);
2061 }
2062
2063 /*
2064 * Check access permissions using "real" credentials.
2065 */
2066 #ifndef _SYS_SYSPROTO_H_
2067 struct access_args {
2068 char *path;
2069 int flags;
2070 };
2071 #endif
2072 int
2073 access(td, uap)
2074 struct thread *td;
2075 register struct access_args /* {
2076 char *path;
2077 int flags;
2078 } */ *uap;
2079 {
2080
2081 return (kern_access(td, uap->path, UIO_USERSPACE, uap->flags));
2082 }
2083
2084 #ifndef _SYS_SYSPROTO_H_
2085 struct faccessat_args {
2086 int dirfd;
2087 char *path;
2088 int mode;
2089 int flag;
2090 }
2091 #endif
2092 int
2093 faccessat(struct thread *td, struct faccessat_args *uap)
2094 {
2095
2096 if (uap->flag & ~AT_EACCESS)
2097 return (EINVAL);
2098 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2099 uap->mode));
2100 }
2101
2102 int
2103 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2104 {
2105
2106 return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, mode));
2107 }
2108
2109 int
2110 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2111 int flags, int mode)
2112 {
2113 struct ucred *cred, *tmpcred;
2114 struct vnode *vp;
2115 struct nameidata nd;
2116 int vfslocked;
2117 int error;
2118
2119 /*
2120 * Create and modify a temporary credential instead of one that
2121 * is potentially shared.
2122 */
2123 if (!(flags & AT_EACCESS)) {
2124 cred = td->td_ucred;
2125 tmpcred = crdup(cred);
2126 tmpcred->cr_uid = cred->cr_ruid;
2127 tmpcred->cr_groups[0] = cred->cr_rgid;
2128 td->td_ucred = tmpcred;
2129 } else
2130 cred = tmpcred = td->td_ucred;
2131 AUDIT_ARG_VALUE(mode);
2132 NDINIT_AT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
2133 AUDITVNODE1, pathseg, path, fd, td);
2134 if ((error = namei(&nd)) != 0)
2135 goto out1;
2136 vfslocked = NDHASGIANT(&nd);
2137 vp = nd.ni_vp;
2138
2139 error = vn_access(vp, mode, tmpcred, td);
2140 NDFREE(&nd, NDF_ONLY_PNBUF);
2141 vput(vp);
2142 VFS_UNLOCK_GIANT(vfslocked);
2143 out1:
2144 if (!(flags & AT_EACCESS)) {
2145 td->td_ucred = cred;
2146 crfree(tmpcred);
2147 }
2148 return (error);
2149 }
2150
2151 /*
2152 * Check access permissions using "effective" credentials.
2153 */
2154 #ifndef _SYS_SYSPROTO_H_
2155 struct eaccess_args {
2156 char *path;
2157 int flags;
2158 };
2159 #endif
2160 int
2161 eaccess(td, uap)
2162 struct thread *td;
2163 register struct eaccess_args /* {
2164 char *path;
2165 int flags;
2166 } */ *uap;
2167 {
2168
2169 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->flags));
2170 }
2171
2172 int
2173 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int flags)
2174 {
2175
2176 return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, flags));
2177 }
2178
2179 #if defined(COMPAT_43)
2180 /*
2181 * Get file status; this version follows links.
2182 */
2183 #ifndef _SYS_SYSPROTO_H_
2184 struct ostat_args {
2185 char *path;
2186 struct ostat *ub;
2187 };
2188 #endif
2189 int
2190 ostat(td, uap)
2191 struct thread *td;
2192 register struct ostat_args /* {
2193 char *path;
2194 struct ostat *ub;
2195 } */ *uap;
2196 {
2197 struct stat sb;
2198 struct ostat osb;
2199 int error;
2200
2201 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2202 if (error)
2203 return (error);
2204 cvtstat(&sb, &osb);
2205 error = copyout(&osb, uap->ub, sizeof (osb));
2206 return (error);
2207 }
2208
2209 /*
2210 * Get file status; this version does not follow links.
2211 */
2212 #ifndef _SYS_SYSPROTO_H_
2213 struct olstat_args {
2214 char *path;
2215 struct ostat *ub;
2216 };
2217 #endif
2218 int
2219 olstat(td, uap)
2220 struct thread *td;
2221 register struct olstat_args /* {
2222 char *path;
2223 struct ostat *ub;
2224 } */ *uap;
2225 {
2226 struct stat sb;
2227 struct ostat osb;
2228 int error;
2229
2230 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2231 if (error)
2232 return (error);
2233 cvtstat(&sb, &osb);
2234 error = copyout(&osb, uap->ub, sizeof (osb));
2235 return (error);
2236 }
2237
2238 /*
2239 * Convert from an old to a new stat structure.
2240 */
2241 void
2242 cvtstat(st, ost)
2243 struct stat *st;
2244 struct ostat *ost;
2245 {
2246
2247 ost->st_dev = st->st_dev;
2248 ost->st_ino = st->st_ino;
2249 ost->st_mode = st->st_mode;
2250 ost->st_nlink = st->st_nlink;
2251 ost->st_uid = st->st_uid;
2252 ost->st_gid = st->st_gid;
2253 ost->st_rdev = st->st_rdev;
2254 if (st->st_size < (quad_t)1 << 32)
2255 ost->st_size = st->st_size;
2256 else
2257 ost->st_size = -2;
2258 ost->st_atime = st->st_atime;
2259 ost->st_mtime = st->st_mtime;
2260 ost->st_ctime = st->st_ctime;
2261 ost->st_blksize = st->st_blksize;
2262 ost->st_blocks = st->st_blocks;
2263 ost->st_flags = st->st_flags;
2264 ost->st_gen = st->st_gen;
2265 }
2266 #endif /* COMPAT_43 */
2267
2268 /*
2269 * Get file status; this version follows links.
2270 */
2271 #ifndef _SYS_SYSPROTO_H_
2272 struct stat_args {
2273 char *path;
2274 struct stat *ub;
2275 };
2276 #endif
2277 int
2278 stat(td, uap)
2279 struct thread *td;
2280 register struct stat_args /* {
2281 char *path;
2282 struct stat *ub;
2283 } */ *uap;
2284 {
2285 struct stat sb;
2286 int error;
2287
2288 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2289 if (error == 0)
2290 error = copyout(&sb, uap->ub, sizeof (sb));
2291 return (error);
2292 }
2293
2294 #ifndef _SYS_SYSPROTO_H_
2295 struct fstatat_args {
2296 int fd;
2297 char *path;
2298 struct stat *buf;
2299 int flag;
2300 }
2301 #endif
2302 int
2303 fstatat(struct thread *td, struct fstatat_args *uap)
2304 {
2305 struct stat sb;
2306 int error;
2307
2308 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2309 UIO_USERSPACE, &sb);
2310 if (error == 0)
2311 error = copyout(&sb, uap->buf, sizeof (sb));
2312 return (error);
2313 }
2314
2315 int
2316 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2317 {
2318
2319 return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
2320 }
2321
2322 int
2323 kern_statat(struct thread *td, int flag, int fd, char *path,
2324 enum uio_seg pathseg, struct stat *sbp)
2325 {
2326
2327 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL));
2328 }
2329
2330 int
2331 kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
2332 enum uio_seg pathseg, struct stat *sbp,
2333 void (*hook)(struct vnode *vp, struct stat *sbp))
2334 {
2335 struct nameidata nd;
2336 struct stat sb;
2337 int error, vfslocked;
2338
2339 if (flag & ~AT_SYMLINK_NOFOLLOW)
2340 return (EINVAL);
2341
2342 NDINIT_AT(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2343 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | MPSAFE, pathseg,
2344 path, fd, td);
2345
2346 if ((error = namei(&nd)) != 0)
2347 return (error);
2348 vfslocked = NDHASGIANT(&nd);
2349 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2350 if (!error) {
2351 SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0);
2352 if (S_ISREG(sb.st_mode))
2353 SDT_PROBE(vfs, , stat, reg, path, pathseg, 0, 0, 0);
2354 if (__predict_false(hook != NULL))
2355 hook(nd.ni_vp, &sb);
2356 }
2357 NDFREE(&nd, NDF_ONLY_PNBUF);
2358 vput(nd.ni_vp);
2359 VFS_UNLOCK_GIANT(vfslocked);
2360 if (error)
2361 return (error);
2362 *sbp = sb;
2363 #ifdef KTRACE
2364 if (KTRPOINT(td, KTR_STRUCT))
2365 ktrstat(&sb);
2366 #endif
2367 return (0);
2368 }
2369
2370 /*
2371 * Get file status; this version does not follow links.
2372 */
2373 #ifndef _SYS_SYSPROTO_H_
2374 struct lstat_args {
2375 char *path;
2376 struct stat *ub;
2377 };
2378 #endif
2379 int
2380 lstat(td, uap)
2381 struct thread *td;
2382 register struct lstat_args /* {
2383 char *path;
2384 struct stat *ub;
2385 } */ *uap;
2386 {
2387 struct stat sb;
2388 int error;
2389
2390 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2391 if (error == 0)
2392 error = copyout(&sb, uap->ub, sizeof (sb));
2393 return (error);
2394 }
2395
2396 int
2397 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2398 {
2399
2400 return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg,
2401 sbp));
2402 }
2403
2404 /*
2405 * Implementation of the NetBSD [l]stat() functions.
2406 */
2407 void
2408 cvtnstat(sb, nsb)
2409 struct stat *sb;
2410 struct nstat *nsb;
2411 {
2412 bzero(nsb, sizeof *nsb);
2413 nsb->st_dev = sb->st_dev;
2414 nsb->st_ino = sb->st_ino;
2415 nsb->st_mode = sb->st_mode;
2416 nsb->st_nlink = sb->st_nlink;
2417 nsb->st_uid = sb->st_uid;
2418 nsb->st_gid = sb->st_gid;
2419 nsb->st_rdev = sb->st_rdev;
2420 nsb->st_atimespec = sb->st_atimespec;
2421 nsb->st_mtimespec = sb->st_mtimespec;
2422 nsb->st_ctimespec = sb->st_ctimespec;
2423 nsb->st_size = sb->st_size;
2424 nsb->st_blocks = sb->st_blocks;
2425 nsb->st_blksize = sb->st_blksize;
2426 nsb->st_flags = sb->st_flags;
2427 nsb->st_gen = sb->st_gen;
2428 nsb->st_birthtimespec = sb->st_birthtimespec;
2429 }
2430
2431 #ifndef _SYS_SYSPROTO_H_
2432 struct nstat_args {
2433 char *path;
2434 struct nstat *ub;
2435 };
2436 #endif
2437 int
2438 nstat(td, uap)
2439 struct thread *td;
2440 register struct nstat_args /* {
2441 char *path;
2442 struct nstat *ub;
2443 } */ *uap;
2444 {
2445 struct stat sb;
2446 struct nstat nsb;
2447 int error;
2448
2449 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2450 if (error)
2451 return (error);
2452 cvtnstat(&sb, &nsb);
2453 error = copyout(&nsb, uap->ub, sizeof (nsb));
2454 return (error);
2455 }
2456
2457 /*
2458 * NetBSD lstat. Get file status; this version does not follow links.
2459 */
2460 #ifndef _SYS_SYSPROTO_H_
2461 struct lstat_args {
2462 char *path;
2463 struct stat *ub;
2464 };
2465 #endif
2466 int
2467 nlstat(td, uap)
2468 struct thread *td;
2469 register struct nlstat_args /* {
2470 char *path;
2471 struct nstat *ub;
2472 } */ *uap;
2473 {
2474 struct stat sb;
2475 struct nstat nsb;
2476 int error;
2477
2478 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2479 if (error)
2480 return (error);
2481 cvtnstat(&sb, &nsb);
2482 error = copyout(&nsb, uap->ub, sizeof (nsb));
2483 return (error);
2484 }
2485
2486 /*
2487 * Get configurable pathname variables.
2488 */
2489 #ifndef _SYS_SYSPROTO_H_
2490 struct pathconf_args {
2491 char *path;
2492 int name;
2493 };
2494 #endif
2495 int
2496 pathconf(td, uap)
2497 struct thread *td;
2498 register struct pathconf_args /* {
2499 char *path;
2500 int name;
2501 } */ *uap;
2502 {
2503
2504 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW));
2505 }
2506
2507 #ifndef _SYS_SYSPROTO_H_
2508 struct lpathconf_args {
2509 char *path;
2510 int name;
2511 };
2512 #endif
2513 int
2514 lpathconf(td, uap)
2515 struct thread *td;
2516 register struct lpathconf_args /* {
2517 char *path;
2518 int name;
2519 } */ *uap;
2520 {
2521
2522 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, NOFOLLOW));
2523 }
2524
2525 int
2526 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2527 u_long flags)
2528 {
2529 struct nameidata nd;
2530 int error, vfslocked;
2531
2532 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1 |
2533 flags, pathseg, path, td);
2534 if ((error = namei(&nd)) != 0)
2535 return (error);
2536 vfslocked = NDHASGIANT(&nd);
2537 NDFREE(&nd, NDF_ONLY_PNBUF);
2538
2539 /* If asynchronous I/O is available, it works for all files. */
2540 if (name == _PC_ASYNC_IO)
2541 td->td_retval[0] = async_io_version;
2542 else
2543 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
2544 vput(nd.ni_vp);
2545 VFS_UNLOCK_GIANT(vfslocked);
2546 return (error);
2547 }
2548
2549 /*
2550 * Return target name of a symbolic link.
2551 */
2552 #ifndef _SYS_SYSPROTO_H_
2553 struct readlink_args {
2554 char *path;
2555 char *buf;
2556 size_t count;
2557 };
2558 #endif
2559 int
2560 readlink(td, uap)
2561 struct thread *td;
2562 register struct readlink_args /* {
2563 char *path;
2564 char *buf;
2565 size_t count;
2566 } */ *uap;
2567 {
2568
2569 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
2570 UIO_USERSPACE, uap->count));
2571 }
2572 #ifndef _SYS_SYSPROTO_H_
2573 struct readlinkat_args {
2574 int fd;
2575 char *path;
2576 char *buf;
2577 size_t bufsize;
2578 };
2579 #endif
2580 int
2581 readlinkat(struct thread *td, struct readlinkat_args *uap)
2582 {
2583
2584 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2585 uap->buf, UIO_USERSPACE, uap->bufsize));
2586 }
2587
2588 int
2589 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
2590 enum uio_seg bufseg, size_t count)
2591 {
2592
2593 return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg,
2594 count));
2595 }
2596
2597 int
2598 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2599 char *buf, enum uio_seg bufseg, size_t count)
2600 {
2601 struct vnode *vp;
2602 struct iovec aiov;
2603 struct uio auio;
2604 int error;
2605 struct nameidata nd;
2606 int vfslocked;
2607
2608 if (count > INT_MAX)
2609 return (EINVAL);
2610
2611 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
2612 AUDITVNODE1, pathseg, path, fd, td);
2613
2614 if ((error = namei(&nd)) != 0)
2615 return (error);
2616 NDFREE(&nd, NDF_ONLY_PNBUF);
2617 vfslocked = NDHASGIANT(&nd);
2618 vp = nd.ni_vp;
2619 #ifdef MAC
2620 error = mac_vnode_check_readlink(td->td_ucred, vp);
2621 if (error) {
2622 vput(vp);
2623 VFS_UNLOCK_GIANT(vfslocked);
2624 return (error);
2625 }
2626 #endif
2627 if (vp->v_type != VLNK)
2628 error = EINVAL;
2629 else {
2630 aiov.iov_base = buf;
2631 aiov.iov_len = count;
2632 auio.uio_iov = &aiov;
2633 auio.uio_iovcnt = 1;
2634 auio.uio_offset = 0;
2635 auio.uio_rw = UIO_READ;
2636 auio.uio_segflg = bufseg;
2637 auio.uio_td = td;
2638 auio.uio_resid = count;
2639 error = VOP_READLINK(vp, &auio, td->td_ucred);
2640 }
2641 vput(vp);
2642 VFS_UNLOCK_GIANT(vfslocked);
2643 td->td_retval[0] = count - auio.uio_resid;
2644 return (error);
2645 }
2646
2647 /*
2648 * Common implementation code for chflags() and fchflags().
2649 */
2650 static int
2651 setfflags(td, vp, flags)
2652 struct thread *td;
2653 struct vnode *vp;
2654 int flags;
2655 {
2656 int error;
2657 struct mount *mp;
2658 struct vattr vattr;
2659
2660 /*
2661 * Prevent non-root users from setting flags on devices. When
2662 * a device is reused, users can retain ownership of the device
2663 * if they are allowed to set flags and programs assume that
2664 * chown can't fail when done as root.
2665 */
2666 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2667 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2668 if (error)
2669 return (error);
2670 }
2671
2672 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2673 return (error);
2674 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2675 VATTR_NULL(&vattr);
2676 vattr.va_flags = flags;
2677 #ifdef MAC
2678 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2679 if (error == 0)
2680 #endif
2681 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2682 VOP_UNLOCK(vp, 0);
2683 vn_finished_write(mp);
2684 return (error);
2685 }
2686
2687 /*
2688 * Change flags of a file given a path name.
2689 */
2690 #ifndef _SYS_SYSPROTO_H_
2691 struct chflags_args {
2692 char *path;
2693 int flags;
2694 };
2695 #endif
2696 int
2697 chflags(td, uap)
2698 struct thread *td;
2699 register struct chflags_args /* {
2700 char *path;
2701 int flags;
2702 } */ *uap;
2703 {
2704 int error;
2705 struct nameidata nd;
2706 int vfslocked;
2707
2708 AUDIT_ARG_FFLAGS(uap->flags);
2709 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE,
2710 uap->path, td);
2711 if ((error = namei(&nd)) != 0)
2712 return (error);
2713 NDFREE(&nd, NDF_ONLY_PNBUF);
2714 vfslocked = NDHASGIANT(&nd);
2715 error = setfflags(td, nd.ni_vp, uap->flags);
2716 vrele(nd.ni_vp);
2717 VFS_UNLOCK_GIANT(vfslocked);
2718 return (error);
2719 }
2720
2721 /*
2722 * Same as chflags() but doesn't follow symlinks.
2723 */
2724 int
2725 lchflags(td, uap)
2726 struct thread *td;
2727 register struct lchflags_args /* {
2728 char *path;
2729 int flags;
2730 } */ *uap;
2731 {
2732 int error;
2733 struct nameidata nd;
2734 int vfslocked;
2735
2736 AUDIT_ARG_FFLAGS(uap->flags);
2737 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE,
2738 uap->path, td);
2739 if ((error = namei(&nd)) != 0)
2740 return (error);
2741 vfslocked = NDHASGIANT(&nd);
2742 NDFREE(&nd, NDF_ONLY_PNBUF);
2743 error = setfflags(td, nd.ni_vp, uap->flags);
2744 vrele(nd.ni_vp);
2745 VFS_UNLOCK_GIANT(vfslocked);
2746 return (error);
2747 }
2748
2749 /*
2750 * Change flags of a file given a file descriptor.
2751 */
2752 #ifndef _SYS_SYSPROTO_H_
2753 struct fchflags_args {
2754 int fd;
2755 int flags;
2756 };
2757 #endif
2758 int
2759 fchflags(td, uap)
2760 struct thread *td;
2761 register struct fchflags_args /* {
2762 int fd;
2763 int flags;
2764 } */ *uap;
2765 {
2766 struct file *fp;
2767 int vfslocked;
2768 int error;
2769
2770 AUDIT_ARG_FD(uap->fd);
2771 AUDIT_ARG_FFLAGS(uap->flags);
2772 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
2773 return (error);
2774 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
2775 #ifdef AUDIT
2776 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2777 AUDIT_ARG_VNODE1(fp->f_vnode);
2778 VOP_UNLOCK(fp->f_vnode, 0);
2779 #endif
2780 error = setfflags(td, fp->f_vnode, uap->flags);
2781 VFS_UNLOCK_GIANT(vfslocked);
2782 fdrop(fp, td);
2783 return (error);
2784 }
2785
2786 /*
2787 * Common implementation code for chmod(), lchmod() and fchmod().
2788 */
2789 static int
2790 setfmode(td, vp, mode)
2791 struct thread *td;
2792 struct vnode *vp;
2793 int mode;
2794 {
2795 int error;
2796 struct mount *mp;
2797 struct vattr vattr;
2798
2799 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2800 return (error);
2801 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2802 VATTR_NULL(&vattr);
2803 vattr.va_mode = mode & ALLPERMS;
2804 #ifdef MAC
2805 error = mac_vnode_check_setmode(td->td_ucred, vp, vattr.va_mode);
2806 if (error == 0)
2807 #endif
2808 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2809 VOP_UNLOCK(vp, 0);
2810 vn_finished_write(mp);
2811 return (error);
2812 }
2813
2814 /*
2815 * Change mode of a file given path name.
2816 */
2817 #ifndef _SYS_SYSPROTO_H_
2818 struct chmod_args {
2819 char *path;
2820 int mode;
2821 };
2822 #endif
2823 int
2824 chmod(td, uap)
2825 struct thread *td;
2826 register struct chmod_args /* {
2827 char *path;
2828 int mode;
2829 } */ *uap;
2830 {
2831
2832 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
2833 }
2834
2835 #ifndef _SYS_SYSPROTO_H_
2836 struct fchmodat_args {
2837 int dirfd;
2838 char *path;
2839 mode_t mode;
2840 int flag;
2841 }
2842 #endif
2843 int
2844 fchmodat(struct thread *td, struct fchmodat_args *uap)
2845 {
2846 int flag = uap->flag;
2847 int fd = uap->fd;
2848 char *path = uap->path;
2849 mode_t mode = uap->mode;
2850
2851 if (flag & ~AT_SYMLINK_NOFOLLOW)
2852 return (EINVAL);
2853
2854 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2855 }
2856
2857 int
2858 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2859 {
2860
2861 return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0));
2862 }
2863
2864 /*
2865 * Change mode of a file given path name (don't follow links.)
2866 */
2867 #ifndef _SYS_SYSPROTO_H_
2868 struct lchmod_args {
2869 char *path;
2870 int mode;
2871 };
2872 #endif
2873 int
2874 lchmod(td, uap)
2875 struct thread *td;
2876 register struct lchmod_args /* {
2877 char *path;
2878 int mode;
2879 } */ *uap;
2880 {
2881
2882 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2883 uap->mode, AT_SYMLINK_NOFOLLOW));
2884 }
2885
2886
2887 int
2888 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2889 mode_t mode, int flag)
2890 {
2891 int error;
2892 struct nameidata nd;
2893 int vfslocked;
2894 int follow;
2895
2896 AUDIT_ARG_MODE(mode);
2897 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2898 NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg, path,
2899 fd, td);
2900 if ((error = namei(&nd)) != 0)
2901 return (error);
2902 vfslocked = NDHASGIANT(&nd);
2903 NDFREE(&nd, NDF_ONLY_PNBUF);
2904 error = setfmode(td, nd.ni_vp, mode);
2905 vrele(nd.ni_vp);
2906 VFS_UNLOCK_GIANT(vfslocked);
2907 return (error);
2908 }
2909
2910 /*
2911 * Change mode of a file given a file descriptor.
2912 */
2913 #ifndef _SYS_SYSPROTO_H_
2914 struct fchmod_args {
2915 int fd;
2916 int mode;
2917 };
2918 #endif
2919 int
2920 fchmod(td, uap)
2921 struct thread *td;
2922 register struct fchmod_args /* {
2923 int fd;
2924 int mode;
2925 } */ *uap;
2926 {
2927 struct file *fp;
2928 int vfslocked;
2929 int error;
2930
2931 AUDIT_ARG_FD(uap->fd);
2932 AUDIT_ARG_MODE(uap->mode);
2933 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
2934 return (error);
2935 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
2936 #ifdef AUDIT
2937 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2938 AUDIT_ARG_VNODE1(fp->f_vnode);
2939 VOP_UNLOCK(fp->f_vnode, 0);
2940 #endif
2941 error = setfmode(td, fp->f_vnode, uap->mode);
2942 VFS_UNLOCK_GIANT(vfslocked);
2943 fdrop(fp, td);
2944 return (error);
2945 }
2946
2947 /*
2948 * Common implementation for chown(), lchown(), and fchown()
2949 */
2950 static int
2951 setfown(td, vp, uid, gid)
2952 struct thread *td;
2953 struct vnode *vp;
2954 uid_t uid;
2955 gid_t gid;
2956 {
2957 int error;
2958 struct mount *mp;
2959 struct vattr vattr;
2960
2961 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2962 return (error);
2963 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2964 VATTR_NULL(&vattr);
2965 vattr.va_uid = uid;
2966 vattr.va_gid = gid;
2967 #ifdef MAC
2968 error = mac_vnode_check_setowner(td->td_ucred, vp, vattr.va_uid,
2969 vattr.va_gid);
2970 if (error == 0)
2971 #endif
2972 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2973 VOP_UNLOCK(vp, 0);
2974 vn_finished_write(mp);
2975 return (error);
2976 }
2977
2978 /*
2979 * Set ownership given a path name.
2980 */
2981 #ifndef _SYS_SYSPROTO_H_
2982 struct chown_args {
2983 char *path;
2984 int uid;
2985 int gid;
2986 };
2987 #endif
2988 int
2989 chown(td, uap)
2990 struct thread *td;
2991 register struct chown_args /* {
2992 char *path;
2993 int uid;
2994 int gid;
2995 } */ *uap;
2996 {
2997
2998 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
2999 }
3000
3001 #ifndef _SYS_SYSPROTO_H_
3002 struct fchownat_args {
3003 int fd;
3004 const char * path;
3005 uid_t uid;
3006 gid_t gid;
3007 int flag;
3008 };
3009 #endif
3010 int
3011 fchownat(struct thread *td, struct fchownat_args *uap)
3012 {
3013 int flag;
3014
3015 flag = uap->flag;
3016 if (flag & ~AT_SYMLINK_NOFOLLOW)
3017 return (EINVAL);
3018
3019 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
3020 uap->gid, uap->flag));
3021 }
3022
3023 int
3024 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3025 int gid)
3026 {
3027
3028 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0));
3029 }
3030
3031 int
3032 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3033 int uid, int gid, int flag)
3034 {
3035 struct nameidata nd;
3036 int error, vfslocked, follow;
3037
3038 AUDIT_ARG_OWNER(uid, gid);
3039 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
3040 NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg, path,
3041 fd, td);
3042
3043 if ((error = namei(&nd)) != 0)
3044 return (error);
3045 vfslocked = NDHASGIANT(&nd);
3046 NDFREE(&nd, NDF_ONLY_PNBUF);
3047 error = setfown(td, nd.ni_vp, uid, gid);
3048 vrele(nd.ni_vp);
3049 VFS_UNLOCK_GIANT(vfslocked);
3050 return (error);
3051 }
3052
3053 /*
3054 * Set ownership given a path name, do not cross symlinks.
3055 */
3056 #ifndef _SYS_SYSPROTO_H_
3057 struct lchown_args {
3058 char *path;
3059 int uid;
3060 int gid;
3061 };
3062 #endif
3063 int
3064 lchown(td, uap)
3065 struct thread *td;
3066 register struct lchown_args /* {
3067 char *path;
3068 int uid;
3069 int gid;
3070 } */ *uap;
3071 {
3072
3073 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
3074 }
3075
3076 int
3077 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3078 int gid)
3079 {
3080
3081 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid,
3082 AT_SYMLINK_NOFOLLOW));
3083 }
3084
3085 /*
3086 * Set ownership given a file descriptor.
3087 */
3088 #ifndef _SYS_SYSPROTO_H_
3089 struct fchown_args {
3090 int fd;
3091 int uid;
3092 int gid;
3093 };
3094 #endif
3095 int
3096 fchown(td, uap)
3097 struct thread *td;
3098 register struct fchown_args /* {
3099 int fd;
3100 int uid;
3101 int gid;
3102 } */ *uap;
3103 {
3104 struct file *fp;
3105 int vfslocked;
3106 int error;
3107
3108 AUDIT_ARG_FD(uap->fd);
3109 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3110 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
3111 return (error);
3112 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
3113 #ifdef AUDIT
3114 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3115 AUDIT_ARG_VNODE1(fp->f_vnode);
3116 VOP_UNLOCK(fp->f_vnode, 0);
3117 #endif
3118 error = setfown(td, fp->f_vnode, uap->uid, uap->gid);
3119 VFS_UNLOCK_GIANT(vfslocked);
3120 fdrop(fp, td);
3121 return (error);
3122 }
3123
3124 /*
3125 * Common implementation code for utimes(), lutimes(), and futimes().
3126 */
3127 static int
3128 getutimes(usrtvp, tvpseg, tsp)
3129 const struct timeval *usrtvp;
3130 enum uio_seg tvpseg;
3131 struct timespec *tsp;
3132 {
3133 struct timeval tv[2];
3134 const struct timeval *tvp;
3135 int error;
3136
3137 if (usrtvp == NULL) {
3138 vfs_timestamp(&tsp[0]);
3139 tsp[1] = tsp[0];
3140 } else {
3141 if (tvpseg == UIO_SYSSPACE) {
3142 tvp = usrtvp;
3143 } else {
3144 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3145 return (error);
3146 tvp = tv;
3147 }
3148
3149 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3150 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3151 return (EINVAL);
3152 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3153 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3154 }
3155 return (0);
3156 }
3157
3158 /*
3159 * Common implementation code for utimes(), lutimes(), and futimes().
3160 */
3161 static int
3162 setutimes(td, vp, ts, numtimes, nullflag)
3163 struct thread *td;
3164 struct vnode *vp;
3165 const struct timespec *ts;
3166 int numtimes;
3167 int nullflag;
3168 {
3169 int error, setbirthtime;
3170 struct mount *mp;
3171 struct vattr vattr;
3172
3173 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3174 return (error);
3175 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3176 setbirthtime = 0;
3177 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3178 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3179 setbirthtime = 1;
3180 VATTR_NULL(&vattr);
3181 vattr.va_atime = ts[0];
3182 vattr.va_mtime = ts[1];
3183 if (setbirthtime)
3184 vattr.va_birthtime = ts[1];
3185 if (numtimes > 2)
3186 vattr.va_birthtime = ts[2];
3187 if (nullflag)
3188 vattr.va_vaflags |= VA_UTIMES_NULL;
3189 #ifdef MAC
3190 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3191 vattr.va_mtime);
3192 #endif
3193 if (error == 0)
3194 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3195 VOP_UNLOCK(vp, 0);
3196 vn_finished_write(mp);
3197 return (error);
3198 }
3199
3200 /*
3201 * Set the access and modification times of a file.
3202 */
3203 #ifndef _SYS_SYSPROTO_H_
3204 struct utimes_args {
3205 char *path;
3206 struct timeval *tptr;
3207 };
3208 #endif
3209 int
3210 utimes(td, uap)
3211 struct thread *td;
3212 register struct utimes_args /* {
3213 char *path;
3214 struct timeval *tptr;
3215 } */ *uap;
3216 {
3217
3218 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3219 UIO_USERSPACE));
3220 }
3221
3222 #ifndef _SYS_SYSPROTO_H_
3223 struct futimesat_args {
3224 int fd;
3225 const char * path;
3226 const struct timeval * times;
3227 };
3228 #endif
3229 int
3230 futimesat(struct thread *td, struct futimesat_args *uap)
3231 {
3232
3233 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3234 uap->times, UIO_USERSPACE));
3235 }
3236
3237 int
3238 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
3239 struct timeval *tptr, enum uio_seg tptrseg)
3240 {
3241
3242 return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg));
3243 }
3244
3245 int
3246 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3247 struct timeval *tptr, enum uio_seg tptrseg)
3248 {
3249 struct nameidata nd;
3250 struct timespec ts[2];
3251 int error, vfslocked;
3252
3253 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3254 return (error);
3255 NDINIT_AT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path,
3256 fd, td);
3257
3258 if ((error = namei(&nd)) != 0)
3259 return (error);
3260 vfslocked = NDHASGIANT(&nd);
3261 NDFREE(&nd, NDF_ONLY_PNBUF);
3262 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3263 vrele(nd.ni_vp);
3264 VFS_UNLOCK_GIANT(vfslocked);
3265 return (error);
3266 }
3267
3268 /*
3269 * Set the access and modification times of a file.
3270 */
3271 #ifndef _SYS_SYSPROTO_H_
3272 struct lutimes_args {
3273 char *path;
3274 struct timeval *tptr;
3275 };
3276 #endif
3277 int
3278 lutimes(td, uap)
3279 struct thread *td;
3280 register struct lutimes_args /* {
3281 char *path;
3282 struct timeval *tptr;
3283 } */ *uap;
3284 {
3285
3286 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3287 UIO_USERSPACE));
3288 }
3289
3290 int
3291 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
3292 struct timeval *tptr, enum uio_seg tptrseg)
3293 {
3294 struct timespec ts[2];
3295 int error;
3296 struct nameidata nd;
3297 int vfslocked;
3298
3299 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3300 return (error);
3301 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td);
3302 if ((error = namei(&nd)) != 0)
3303 return (error);
3304 vfslocked = NDHASGIANT(&nd);
3305 NDFREE(&nd, NDF_ONLY_PNBUF);
3306 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3307 vrele(nd.ni_vp);
3308 VFS_UNLOCK_GIANT(vfslocked);
3309 return (error);
3310 }
3311
3312 /*
3313 * Set the access and modification times of a file.
3314 */
3315 #ifndef _SYS_SYSPROTO_H_
3316 struct futimes_args {
3317 int fd;
3318 struct timeval *tptr;
3319 };
3320 #endif
3321 int
3322 futimes(td, uap)
3323 struct thread *td;
3324 register struct futimes_args /* {
3325 int fd;
3326 struct timeval *tptr;
3327 } */ *uap;
3328 {
3329
3330 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3331 }
3332
3333 int
3334 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3335 enum uio_seg tptrseg)
3336 {
3337 struct timespec ts[2];
3338 struct file *fp;
3339 int vfslocked;
3340 int error;
3341
3342 AUDIT_ARG_FD(fd);
3343 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3344 return (error);
3345 if ((error = getvnode(td->td_proc->p_fd, fd, &fp)) != 0)
3346 return (error);
3347 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
3348 #ifdef AUDIT
3349 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3350 AUDIT_ARG_VNODE1(fp->f_vnode);
3351 VOP_UNLOCK(fp->f_vnode, 0);
3352 #endif
3353 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3354 VFS_UNLOCK_GIANT(vfslocked);
3355 fdrop(fp, td);
3356 return (error);
3357 }
3358
3359 /*
3360 * Truncate a file given its path name.
3361 */
3362 #ifndef _SYS_SYSPROTO_H_
3363 struct truncate_args {
3364 char *path;
3365 int pad;
3366 off_t length;
3367 };
3368 #endif
3369 int
3370 truncate(td, uap)
3371 struct thread *td;
3372 register struct truncate_args /* {
3373 char *path;
3374 int pad;
3375 off_t length;
3376 } */ *uap;
3377 {
3378
3379 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3380 }
3381
3382 int
3383 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3384 {
3385 struct mount *mp;
3386 struct vnode *vp;
3387 struct vattr vattr;
3388 int error;
3389 struct nameidata nd;
3390 int vfslocked;
3391
3392 if (length < 0)
3393 return(EINVAL);
3394 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td);
3395 if ((error = namei(&nd)) != 0)
3396 return (error);
3397 vfslocked = NDHASGIANT(&nd);
3398 vp = nd.ni_vp;
3399 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3400 vrele(vp);
3401 VFS_UNLOCK_GIANT(vfslocked);
3402 return (error);
3403 }
3404 NDFREE(&nd, NDF_ONLY_PNBUF);
3405 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3406 if (vp->v_type == VDIR)
3407 error = EISDIR;
3408 #ifdef MAC
3409 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3410 }
3411 #endif
3412 else if ((error = vn_writechk(vp)) == 0 &&
3413 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3414 VATTR_NULL(&vattr);
3415 vattr.va_size = length;
3416 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3417 }
3418 vput(vp);
3419 vn_finished_write(mp);
3420 VFS_UNLOCK_GIANT(vfslocked);
3421 return (error);
3422 }
3423
3424 #if defined(COMPAT_43)
3425 /*
3426 * Truncate a file given its path name.
3427 */
3428 #ifndef _SYS_SYSPROTO_H_
3429 struct otruncate_args {
3430 char *path;
3431 long length;
3432 };
3433 #endif
3434 int
3435 otruncate(td, uap)
3436 struct thread *td;
3437 register struct otruncate_args /* {
3438 char *path;
3439 long length;
3440 } */ *uap;
3441 {
3442 struct truncate_args /* {
3443 char *path;
3444 int pad;
3445 off_t length;
3446 } */ nuap;
3447
3448 nuap.path = uap->path;
3449 nuap.length = uap->length;
3450 return (truncate(td, &nuap));
3451 }
3452 #endif /* COMPAT_43 */
3453
3454 /* Versions with the pad argument */
3455 int
3456 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3457 {
3458 struct truncate_args ouap;
3459
3460 ouap.path = uap->path;
3461 ouap.length = uap->length;
3462 return (truncate(td, &ouap));
3463 }
3464
3465 int
3466 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3467 {
3468 struct ftruncate_args ouap;
3469
3470 ouap.fd = uap->fd;
3471 ouap.length = uap->length;
3472 return (ftruncate(td, &ouap));
3473 }
3474
3475 /*
3476 * Sync an open file.
3477 */
3478 #ifndef _SYS_SYSPROTO_H_
3479 struct fsync_args {
3480 int fd;
3481 };
3482 #endif
3483 int
3484 fsync(td, uap)
3485 struct thread *td;
3486 struct fsync_args /* {
3487 int fd;
3488 } */ *uap;
3489 {
3490 struct vnode *vp;
3491 struct mount *mp;
3492 struct file *fp;
3493 int vfslocked;
3494 int error, lock_flags;
3495
3496 AUDIT_ARG_FD(uap->fd);
3497 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
3498 return (error);
3499 vp = fp->f_vnode;
3500 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
3501 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3502 goto drop;
3503 if (MNT_SHARED_WRITES(mp) ||
3504 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3505 lock_flags = LK_SHARED;
3506 } else {
3507 lock_flags = LK_EXCLUSIVE;
3508 }
3509 vn_lock(vp, lock_flags | LK_RETRY);
3510 AUDIT_ARG_VNODE1(vp);
3511 if (vp->v_object != NULL) {
3512 VM_OBJECT_LOCK(vp->v_object);
3513 vm_object_page_clean(vp->v_object, 0, 0, 0);
3514 VM_OBJECT_UNLOCK(vp->v_object);
3515 }
3516 error = VOP_FSYNC(vp, MNT_WAIT, td);
3517
3518 VOP_UNLOCK(vp, 0);
3519 vn_finished_write(mp);
3520 drop:
3521 VFS_UNLOCK_GIANT(vfslocked);
3522 fdrop(fp, td);
3523 return (error);
3524 }
3525
3526 /*
3527 * Rename files. Source and destination must either both be directories, or
3528 * both not be directories. If target is a directory, it must be empty.
3529 */
3530 #ifndef _SYS_SYSPROTO_H_
3531 struct rename_args {
3532 char *from;
3533 char *to;
3534 };
3535 #endif
3536 int
3537 rename(td, uap)
3538 struct thread *td;
3539 register struct rename_args /* {
3540 char *from;
3541 char *to;
3542 } */ *uap;
3543 {
3544
3545 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
3546 }
3547
3548 #ifndef _SYS_SYSPROTO_H_
3549 struct renameat_args {
3550 int oldfd;
3551 char *old;
3552 int newfd;
3553 char *new;
3554 };
3555 #endif
3556 int
3557 renameat(struct thread *td, struct renameat_args *uap)
3558 {
3559
3560 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3561 UIO_USERSPACE));
3562 }
3563
3564 int
3565 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
3566 {
3567
3568 return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg));
3569 }
3570
3571 int
3572 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3573 enum uio_seg pathseg)
3574 {
3575 struct mount *mp = NULL;
3576 struct vnode *tvp, *fvp, *tdvp;
3577 struct nameidata fromnd, tond;
3578 int tvfslocked;
3579 int fvfslocked;
3580 int error;
3581
3582 bwillwrite();
3583 #ifdef MAC
3584 NDINIT_AT(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE |
3585 AUDITVNODE1, pathseg, old, oldfd, td);
3586 #else
3587 NDINIT_AT(&fromnd, DELETE, WANTPARENT | SAVESTART | MPSAFE |
3588 AUDITVNODE1, pathseg, old, oldfd, td);
3589 #endif
3590
3591 if ((error = namei(&fromnd)) != 0)
3592 return (error);
3593 fvfslocked = NDHASGIANT(&fromnd);
3594 tvfslocked = 0;
3595 #ifdef MAC
3596 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3597 fromnd.ni_vp, &fromnd.ni_cnd);
3598 VOP_UNLOCK(fromnd.ni_dvp, 0);
3599 if (fromnd.ni_dvp != fromnd.ni_vp)
3600 VOP_UNLOCK(fromnd.ni_vp, 0);
3601 #endif
3602 fvp = fromnd.ni_vp;
3603 if (error == 0)
3604 error = vn_start_write(fvp, &mp, V_WAIT | PCATCH);
3605 if (error != 0) {
3606 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3607 vrele(fromnd.ni_dvp);
3608 vrele(fvp);
3609 goto out1;
3610 }
3611 NDINIT_AT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART |
3612 MPSAFE | AUDITVNODE2, pathseg, new, newfd, td);
3613 if (fromnd.ni_vp->v_type == VDIR)
3614 tond.ni_cnd.cn_flags |= WILLBEDIR;
3615 if ((error = namei(&tond)) != 0) {
3616 /* Translate error code for rename("dir1", "dir2/."). */
3617 if (error == EISDIR && fvp->v_type == VDIR)
3618 error = EINVAL;
3619 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3620 vrele(fromnd.ni_dvp);
3621 vrele(fvp);
3622 vn_finished_write(mp);
3623 goto out1;
3624 }
3625 tvfslocked = NDHASGIANT(&tond);
3626 tdvp = tond.ni_dvp;
3627 tvp = tond.ni_vp;
3628 if (tvp != NULL) {
3629 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3630 error = ENOTDIR;
3631 goto out;
3632 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3633 error = EISDIR;
3634 goto out;
3635 }
3636 }
3637 if (fvp == tdvp) {
3638 error = EINVAL;
3639 goto out;
3640 }
3641 /*
3642 * If the source is the same as the destination (that is, if they
3643 * are links to the same vnode), then there is nothing to do.
3644 */
3645 if (fvp == tvp)
3646 error = -1;
3647 #ifdef MAC
3648 else
3649 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3650 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3651 #endif
3652 out:
3653 if (!error) {
3654 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3655 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3656 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3657 NDFREE(&tond, NDF_ONLY_PNBUF);
3658 } else {
3659 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3660 NDFREE(&tond, NDF_ONLY_PNBUF);
3661 if (tvp)
3662 vput(tvp);
3663 if (tdvp == tvp)
3664 vrele(tdvp);
3665 else
3666 vput(tdvp);
3667 vrele(fromnd.ni_dvp);
3668 vrele(fvp);
3669 }
3670 vrele(tond.ni_startdir);
3671 vn_finished_write(mp);
3672 out1:
3673 if (fromnd.ni_startdir)
3674 vrele(fromnd.ni_startdir);
3675 VFS_UNLOCK_GIANT(fvfslocked);
3676 VFS_UNLOCK_GIANT(tvfslocked);
3677 if (error == -1)
3678 return (0);
3679 return (error);
3680 }
3681
3682 /*
3683 * Make a directory file.
3684 */
3685 #ifndef _SYS_SYSPROTO_H_
3686 struct mkdir_args {
3687 char *path;
3688 int mode;
3689 };
3690 #endif
3691 int
3692 mkdir(td, uap)
3693 struct thread *td;
3694 register struct mkdir_args /* {
3695 char *path;
3696 int mode;
3697 } */ *uap;
3698 {
3699
3700 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
3701 }
3702
3703 #ifndef _SYS_SYSPROTO_H_
3704 struct mkdirat_args {
3705 int fd;
3706 char *path;
3707 mode_t mode;
3708 };
3709 #endif
3710 int
3711 mkdirat(struct thread *td, struct mkdirat_args *uap)
3712 {
3713
3714 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3715 }
3716
3717 int
3718 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
3719 {
3720
3721 return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode));
3722 }
3723
3724 int
3725 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3726 int mode)
3727 {
3728 struct mount *mp;
3729 struct vnode *vp;
3730 struct vattr vattr;
3731 int error;
3732 struct nameidata nd;
3733 int vfslocked;
3734
3735 AUDIT_ARG_MODE(mode);
3736 restart:
3737 bwillwrite();
3738 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1,
3739 segflg, path, fd, td);
3740 nd.ni_cnd.cn_flags |= WILLBEDIR;
3741 if ((error = namei(&nd)) != 0)
3742 return (error);
3743 vfslocked = NDHASGIANT(&nd);
3744 vp = nd.ni_vp;
3745 if (vp != NULL) {
3746 NDFREE(&nd, NDF_ONLY_PNBUF);
3747 /*
3748 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3749 * the strange behaviour of leaving the vnode unlocked
3750 * if the target is the same vnode as the parent.
3751 */
3752 if (vp == nd.ni_dvp)
3753 vrele(nd.ni_dvp);
3754 else
3755 vput(nd.ni_dvp);
3756 vrele(vp);
3757 VFS_UNLOCK_GIANT(vfslocked);
3758 return (EEXIST);
3759 }
3760 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3761 NDFREE(&nd, NDF_ONLY_PNBUF);
3762 vput(nd.ni_dvp);
3763 VFS_UNLOCK_GIANT(vfslocked);
3764 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3765 return (error);
3766 goto restart;
3767 }
3768 VATTR_NULL(&vattr);
3769 vattr.va_type = VDIR;
3770 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3771 #ifdef MAC
3772 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3773 &vattr);
3774 if (error)
3775 goto out;
3776 #endif
3777 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3778 #ifdef MAC
3779 out:
3780 #endif
3781 NDFREE(&nd, NDF_ONLY_PNBUF);
3782 vput(nd.ni_dvp);
3783 if (!error)
3784 vput(nd.ni_vp);
3785 vn_finished_write(mp);
3786 VFS_UNLOCK_GIANT(vfslocked);
3787 return (error);
3788 }
3789
3790 /*
3791 * Remove a directory file.
3792 */
3793 #ifndef _SYS_SYSPROTO_H_
3794 struct rmdir_args {
3795 char *path;
3796 };
3797 #endif
3798 int
3799 rmdir(td, uap)
3800 struct thread *td;
3801 struct rmdir_args /* {
3802 char *path;
3803 } */ *uap;
3804 {
3805
3806 return (kern_rmdir(td, uap->path, UIO_USERSPACE));
3807 }
3808
3809 int
3810 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
3811 {
3812
3813 return (kern_rmdirat(td, AT_FDCWD, path, pathseg));
3814 }
3815
3816 int
3817 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3818 {
3819 struct mount *mp;
3820 struct vnode *vp;
3821 int error;
3822 struct nameidata nd;
3823 int vfslocked;
3824
3825 restart:
3826 bwillwrite();
3827 NDINIT_AT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1,
3828 pathseg, path, fd, td);
3829 if ((error = namei(&nd)) != 0)
3830 return (error);
3831 vfslocked = NDHASGIANT(&nd);
3832 vp = nd.ni_vp;
3833 if (vp->v_type != VDIR) {
3834 error = ENOTDIR;
3835 goto out;
3836 }
3837 /*
3838 * No rmdir "." please.
3839 */
3840 if (nd.ni_dvp == vp) {
3841 error = EINVAL;
3842 goto out;
3843 }
3844 /*
3845 * The root of a mounted filesystem cannot be deleted.
3846 */
3847 if (vp->v_vflag & VV_ROOT) {
3848 error = EBUSY;
3849 goto out;
3850 }
3851 #ifdef MAC
3852 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3853 &nd.ni_cnd);
3854 if (error)
3855 goto out;
3856 #endif
3857 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3858 NDFREE(&nd, NDF_ONLY_PNBUF);
3859 vput(vp);
3860 if (nd.ni_dvp == vp)
3861 vrele(nd.ni_dvp);
3862 else
3863 vput(nd.ni_dvp);
3864 VFS_UNLOCK_GIANT(vfslocked);
3865 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3866 return (error);
3867 goto restart;
3868 }
3869 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3870 vn_finished_write(mp);
3871 out:
3872 NDFREE(&nd, NDF_ONLY_PNBUF);
3873 vput(vp);
3874 if (nd.ni_dvp == vp)
3875 vrele(nd.ni_dvp);
3876 else
3877 vput(nd.ni_dvp);
3878 VFS_UNLOCK_GIANT(vfslocked);
3879 return (error);
3880 }
3881
3882 #ifdef COMPAT_43
3883 /*
3884 * Read a block of directory entries in a filesystem independent format.
3885 */
3886 #ifndef _SYS_SYSPROTO_H_
3887 struct ogetdirentries_args {
3888 int fd;
3889 char *buf;
3890 u_int count;
3891 long *basep;
3892 };
3893 #endif
3894 int
3895 ogetdirentries(td, uap)
3896 struct thread *td;
3897 register struct ogetdirentries_args /* {
3898 int fd;
3899 char *buf;
3900 u_int count;
3901 long *basep;
3902 } */ *uap;
3903 {
3904 struct vnode *vp;
3905 struct file *fp;
3906 struct uio auio, kuio;
3907 struct iovec aiov, kiov;
3908 struct dirent *dp, *edp;
3909 caddr_t dirbuf;
3910 int error, eofflag, readcnt, vfslocked;
3911 long loff;
3912
3913 /* XXX arbitrary sanity limit on `count'. */
3914 if (uap->count > 64 * 1024)
3915 return (EINVAL);
3916 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0)
3917 return (error);
3918 if ((fp->f_flag & FREAD) == 0) {
3919 fdrop(fp, td);
3920 return (EBADF);
3921 }
3922 vp = fp->f_vnode;
3923 unionread:
3924 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
3925 if (vp->v_type != VDIR) {
3926 VFS_UNLOCK_GIANT(vfslocked);
3927 fdrop(fp, td);
3928 return (EINVAL);
3929 }
3930 aiov.iov_base = uap->buf;
3931 aiov.iov_len = uap->count;
3932 auio.uio_iov = &aiov;
3933 auio.uio_iovcnt = 1;
3934 auio.uio_rw = UIO_READ;
3935 auio.uio_segflg = UIO_USERSPACE;
3936 auio.uio_td = td;
3937 auio.uio_resid = uap->count;
3938 vn_lock(vp, LK_SHARED | LK_RETRY);
3939 loff = auio.uio_offset = fp->f_offset;
3940 #ifdef MAC
3941 error = mac_vnode_check_readdir(td->td_ucred, vp);
3942 if (error) {
3943 VOP_UNLOCK(vp, 0);
3944 VFS_UNLOCK_GIANT(vfslocked);
3945 fdrop(fp, td);
3946 return (error);
3947 }
3948 #endif
3949 # if (BYTE_ORDER != LITTLE_ENDIAN)
3950 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
3951 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
3952 NULL, NULL);
3953 fp->f_offset = auio.uio_offset;
3954 } else
3955 # endif
3956 {
3957 kuio = auio;
3958 kuio.uio_iov = &kiov;
3959 kuio.uio_segflg = UIO_SYSSPACE;
3960 kiov.iov_len = uap->count;
3961 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK);
3962 kiov.iov_base = dirbuf;
3963 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
3964 NULL, NULL);
3965 fp->f_offset = kuio.uio_offset;
3966 if (error == 0) {
3967 readcnt = uap->count - kuio.uio_resid;
3968 edp = (struct dirent *)&dirbuf[readcnt];
3969 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
3970 # if (BYTE_ORDER == LITTLE_ENDIAN)
3971 /*
3972 * The expected low byte of
3973 * dp->d_namlen is our dp->d_type.
3974 * The high MBZ byte of dp->d_namlen
3975 * is our dp->d_namlen.
3976 */
3977 dp->d_type = dp->d_namlen;
3978 dp->d_namlen = 0;
3979 # else
3980 /*
3981 * The dp->d_type is the high byte
3982 * of the expected dp->d_namlen,
3983 * so must be zero'ed.
3984 */
3985 dp->d_type = 0;
3986 # endif
3987 if (dp->d_reclen > 0) {
3988 dp = (struct dirent *)
3989 ((char *)dp + dp->d_reclen);
3990 } else {
3991 error = EIO;
3992 break;
3993 }
3994 }
3995 if (dp >= edp)
3996 error = uiomove(dirbuf, readcnt, &auio);
3997 }
3998 free(dirbuf, M_TEMP);
3999 }
4000 if (error) {
4001 VOP_UNLOCK(vp, 0);
4002 VFS_UNLOCK_GIANT(vfslocked);
4003 fdrop(fp, td);
4004 return (error);
4005 }
4006 if (uap->count == auio.uio_resid &&
4007 (vp->v_vflag & VV_ROOT) &&
4008 (vp->v_mount->mnt_flag & MNT_UNION)) {
4009 struct vnode *tvp = vp;
4010 vp = vp->v_mount->mnt_vnodecovered;
4011 VREF(vp);
4012 fp->f_vnode = vp;
4013 fp->f_data = vp;
4014 fp->f_offset = 0;
4015 vput(tvp);
4016 VFS_UNLOCK_GIANT(vfslocked);
4017 goto unionread;
4018 }
4019 VOP_UNLOCK(vp, 0);
4020 VFS_UNLOCK_GIANT(vfslocked);
4021 error = copyout(&loff, uap->basep, sizeof(long));
4022 fdrop(fp, td);
4023 td->td_retval[0] = uap->count - auio.uio_resid;
4024 return (error);
4025 }
4026 #endif /* COMPAT_43 */
4027
4028 /*
4029 * Read a block of directory entries in a filesystem independent format.
4030 */
4031 #ifndef _SYS_SYSPROTO_H_
4032 struct getdirentries_args {
4033 int fd;
4034 char *buf;
4035 u_int count;
4036 long *basep;
4037 };
4038 #endif
4039 int
4040 getdirentries(td, uap)
4041 struct thread *td;
4042 register struct getdirentries_args /* {
4043 int fd;
4044 char *buf;
4045 u_int count;
4046 long *basep;
4047 } */ *uap;
4048 {
4049 long base;
4050 int error;
4051
4052 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base);
4053 if (error)
4054 return (error);
4055 if (uap->basep != NULL)
4056 error = copyout(&base, uap->basep, sizeof(long));
4057 return (error);
4058 }
4059
4060 int
4061 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count,
4062 long *basep)
4063 {
4064 struct vnode *vp;
4065 struct file *fp;
4066 struct uio auio;
4067 struct iovec aiov;
4068 int vfslocked;
4069 long loff;
4070 int error, eofflag;
4071
4072 AUDIT_ARG_FD(fd);
4073 if (count > INT_MAX)
4074 return (EINVAL);
4075 if ((error = getvnode(td->td_proc->p_fd, fd, &fp)) != 0)
4076 return (error);
4077 if ((fp->f_flag & FREAD) == 0) {
4078 fdrop(fp, td);
4079 return (EBADF);
4080 }
4081 vp = fp->f_vnode;
4082 unionread:
4083 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
4084 if (vp->v_type != VDIR) {
4085 VFS_UNLOCK_GIANT(vfslocked);
4086 error = EINVAL;
4087 goto fail;
4088 }
4089 aiov.iov_base = buf;
4090 aiov.iov_len = count;
4091 auio.uio_iov = &aiov;
4092 auio.uio_iovcnt = 1;
4093 auio.uio_rw = UIO_READ;
4094 auio.uio_segflg = UIO_USERSPACE;
4095 auio.uio_td = td;
4096 auio.uio_resid = count;
4097 vn_lock(vp, LK_SHARED | LK_RETRY);
4098 AUDIT_ARG_VNODE1(vp);
4099 loff = auio.uio_offset = fp->f_offset;
4100 #ifdef MAC
4101 error = mac_vnode_check_readdir(td->td_ucred, vp);
4102 if (error == 0)
4103 #endif
4104 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4105 NULL);
4106 fp->f_offset = auio.uio_offset;
4107 if (error) {
4108 VOP_UNLOCK(vp, 0);
4109 VFS_UNLOCK_GIANT(vfslocked);
4110 goto fail;
4111 }
4112 if (count == auio.uio_resid &&
4113 (vp->v_vflag & VV_ROOT) &&
4114 (vp->v_mount->mnt_flag & MNT_UNION)) {
4115 struct vnode *tvp = vp;
4116 vp = vp->v_mount->mnt_vnodecovered;
4117 VREF(vp);
4118 fp->f_vnode = vp;
4119 fp->f_data = vp;
4120 fp->f_offset = 0;
4121 vput(tvp);
4122 VFS_UNLOCK_GIANT(vfslocked);
4123 goto unionread;
4124 }
4125 VOP_UNLOCK(vp, 0);
4126 VFS_UNLOCK_GIANT(vfslocked);
4127 *basep = loff;
4128 td->td_retval[0] = count - auio.uio_resid;
4129 fail:
4130 fdrop(fp, td);
4131 return (error);
4132 }
4133
4134 #ifndef _SYS_SYSPROTO_H_
4135 struct getdents_args {
4136 int fd;
4137 char *buf;
4138 size_t count;
4139 };
4140 #endif
4141 int
4142 getdents(td, uap)
4143 struct thread *td;
4144 register struct getdents_args /* {
4145 int fd;
4146 char *buf;
4147 u_int count;
4148 } */ *uap;
4149 {
4150 struct getdirentries_args ap;
4151 ap.fd = uap->fd;
4152 ap.buf = uap->buf;
4153 ap.count = uap->count;
4154 ap.basep = NULL;
4155 return (getdirentries(td, &ap));
4156 }
4157
4158 /*
4159 * Set the mode mask for creation of filesystem nodes.
4160 */
4161 #ifndef _SYS_SYSPROTO_H_
4162 struct umask_args {
4163 int newmask;
4164 };
4165 #endif
4166 int
4167 umask(td, uap)
4168 struct thread *td;
4169 struct umask_args /* {
4170 int newmask;
4171 } */ *uap;
4172 {
4173 register struct filedesc *fdp;
4174
4175 FILEDESC_XLOCK(td->td_proc->p_fd);
4176 fdp = td->td_proc->p_fd;
4177 td->td_retval[0] = fdp->fd_cmask;
4178 fdp->fd_cmask = uap->newmask & ALLPERMS;
4179 FILEDESC_XUNLOCK(td->td_proc->p_fd);
4180 return (0);
4181 }
4182
4183 /*
4184 * Void all references to file by ripping underlying filesystem away from
4185 * vnode.
4186 */
4187 #ifndef _SYS_SYSPROTO_H_
4188 struct revoke_args {
4189 char *path;
4190 };
4191 #endif
4192 int
4193 revoke(td, uap)
4194 struct thread *td;
4195 register struct revoke_args /* {
4196 char *path;
4197 } */ *uap;
4198 {
4199 struct vnode *vp;
4200 struct vattr vattr;
4201 int error;
4202 struct nameidata nd;
4203 int vfslocked;
4204
4205 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
4206 UIO_USERSPACE, uap->path, td);
4207 if ((error = namei(&nd)) != 0)
4208 return (error);
4209 vfslocked = NDHASGIANT(&nd);
4210 vp = nd.ni_vp;
4211 NDFREE(&nd, NDF_ONLY_PNBUF);
4212 if (vp->v_type != VCHR) {
4213 error = EINVAL;
4214 goto out;
4215 }
4216 #ifdef MAC
4217 error = mac_vnode_check_revoke(td->td_ucred, vp);
4218 if (error)
4219 goto out;
4220 #endif
4221 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4222 if (error)
4223 goto out;
4224 if (td->td_ucred->cr_uid != vattr.va_uid) {
4225 error = priv_check(td, PRIV_VFS_ADMIN);
4226 if (error)
4227 goto out;
4228 }
4229 if (vcount(vp) > 1)
4230 VOP_REVOKE(vp, REVOKEALL);
4231 out:
4232 vput(vp);
4233 VFS_UNLOCK_GIANT(vfslocked);
4234 return (error);
4235 }
4236
4237 /*
4238 * Convert a user file descriptor to a kernel file entry.
4239 * A reference on the file entry is held upon returning.
4240 */
4241 int
4242 getvnode(fdp, fd, fpp)
4243 struct filedesc *fdp;
4244 int fd;
4245 struct file **fpp;
4246 {
4247 int error;
4248 struct file *fp;
4249
4250 error = 0;
4251 fp = NULL;
4252 if (fdp == NULL || (fp = fget_unlocked(fdp, fd)) == NULL)
4253 error = EBADF;
4254 else if (fp->f_vnode == NULL) {
4255 error = EINVAL;
4256 fdrop(fp, curthread);
4257 }
4258 *fpp = fp;
4259 return (error);
4260 }
4261
4262 /*
4263 * Get an (NFS) file handle.
4264 */
4265 #ifndef _SYS_SYSPROTO_H_
4266 struct lgetfh_args {
4267 char *fname;
4268 fhandle_t *fhp;
4269 };
4270 #endif
4271 int
4272 lgetfh(td, uap)
4273 struct thread *td;
4274 register struct lgetfh_args *uap;
4275 {
4276 struct nameidata nd;
4277 fhandle_t fh;
4278 register struct vnode *vp;
4279 int vfslocked;
4280 int error;
4281
4282 error = priv_check(td, PRIV_VFS_GETFH);
4283 if (error)
4284 return (error);
4285 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
4286 UIO_USERSPACE, uap->fname, td);
4287 error = namei(&nd);
4288 if (error)
4289 return (error);
4290 vfslocked = NDHASGIANT(&nd);
4291 NDFREE(&nd, NDF_ONLY_PNBUF);
4292 vp = nd.ni_vp;
4293 bzero(&fh, sizeof(fh));
4294 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4295 error = VOP_VPTOFH(vp, &fh.fh_fid);
4296 vput(vp);
4297 VFS_UNLOCK_GIANT(vfslocked);
4298 if (error)
4299 return (error);
4300 error = copyout(&fh, uap->fhp, sizeof (fh));
4301 return (error);
4302 }
4303
4304 #ifndef _SYS_SYSPROTO_H_
4305 struct getfh_args {
4306 char *fname;
4307 fhandle_t *fhp;
4308 };
4309 #endif
4310 int
4311 getfh(td, uap)
4312 struct thread *td;
4313 register struct getfh_args *uap;
4314 {
4315 struct nameidata nd;
4316 fhandle_t fh;
4317 register struct vnode *vp;
4318 int vfslocked;
4319 int error;
4320
4321 error = priv_check(td, PRIV_VFS_GETFH);
4322 if (error)
4323 return (error);
4324 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
4325 UIO_USERSPACE, uap->fname, td);
4326 error = namei(&nd);
4327 if (error)
4328 return (error);
4329 vfslocked = NDHASGIANT(&nd);
4330 NDFREE(&nd, NDF_ONLY_PNBUF);
4331 vp = nd.ni_vp;
4332 bzero(&fh, sizeof(fh));
4333 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4334 error = VOP_VPTOFH(vp, &fh.fh_fid);
4335 vput(vp);
4336 VFS_UNLOCK_GIANT(vfslocked);
4337 if (error)
4338 return (error);
4339 error = copyout(&fh, uap->fhp, sizeof (fh));
4340 return (error);
4341 }
4342
4343 /*
4344 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4345 * open descriptor.
4346 *
4347 * warning: do not remove the priv_check() call or this becomes one giant
4348 * security hole.
4349 */
4350 #ifndef _SYS_SYSPROTO_H_
4351 struct fhopen_args {
4352 const struct fhandle *u_fhp;
4353 int flags;
4354 };
4355 #endif
4356 int
4357 fhopen(td, uap)
4358 struct thread *td;
4359 struct fhopen_args /* {
4360 const struct fhandle *u_fhp;
4361 int flags;
4362 } */ *uap;
4363 {
4364 struct proc *p = td->td_proc;
4365 struct mount *mp;
4366 struct vnode *vp;
4367 struct fhandle fhp;
4368 struct vattr vat;
4369 struct vattr *vap = &vat;
4370 struct flock lf;
4371 struct file *fp;
4372 register struct filedesc *fdp = p->p_fd;
4373 int fmode, error, type;
4374 accmode_t accmode;
4375 struct file *nfp;
4376 int vfslocked;
4377 int indx;
4378
4379 error = priv_check(td, PRIV_VFS_FHOPEN);
4380 if (error)
4381 return (error);
4382 fmode = FFLAGS(uap->flags);
4383 /* why not allow a non-read/write open for our lockd? */
4384 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4385 return (EINVAL);
4386 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
4387 if (error)
4388 return(error);
4389 /* find the mount point */
4390 mp = vfs_busyfs(&fhp.fh_fsid);
4391 if (mp == NULL)
4392 return (ESTALE);
4393 vfslocked = VFS_LOCK_GIANT(mp);
4394 /* now give me my vnode, it gets returned to me locked */
4395 error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
4396 vfs_unbusy(mp);
4397 if (error)
4398 goto out;
4399 /*
4400 * from now on we have to make sure not
4401 * to forget about the vnode
4402 * any error that causes an abort must vput(vp)
4403 * just set error = err and 'goto bad;'.
4404 */
4405
4406 /*
4407 * from vn_open
4408 */
4409 if (vp->v_type == VLNK) {
4410 error = EMLINK;
4411 goto bad;
4412 }
4413 if (vp->v_type == VSOCK) {
4414 error = EOPNOTSUPP;
4415 goto bad;
4416 }
4417 accmode = 0;
4418 if (fmode & (FWRITE | O_TRUNC)) {
4419 if (vp->v_type == VDIR) {
4420 error = EISDIR;
4421 goto bad;
4422 }
4423 error = vn_writechk(vp);
4424 if (error)
4425 goto bad;
4426 accmode |= VWRITE;
4427 }
4428 if (fmode & FREAD)
4429 accmode |= VREAD;
4430 if ((fmode & O_APPEND) && (fmode & FWRITE))
4431 accmode |= VAPPEND;
4432 #ifdef MAC
4433 error = mac_vnode_check_open(td->td_ucred, vp, accmode);
4434 if (error)
4435 goto bad;
4436 #endif
4437 if (accmode) {
4438 error = VOP_ACCESS(vp, accmode, td->td_ucred, td);
4439 if (error)
4440 goto bad;
4441 }
4442 if (fmode & O_TRUNC) {
4443 vfs_ref(mp);
4444 VOP_UNLOCK(vp, 0); /* XXX */
4445 if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) {
4446 vrele(vp);
4447 vfs_rel(mp);
4448 goto out;
4449 }
4450 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
4451 vfs_rel(mp);
4452 #ifdef MAC
4453 /*
4454 * We don't yet have fp->f_cred, so use td->td_ucred, which
4455 * should be right.
4456 */
4457 error = mac_vnode_check_write(td->td_ucred, td->td_ucred, vp);
4458 if (error == 0) {
4459 #endif
4460 VATTR_NULL(vap);
4461 vap->va_size = 0;
4462 error = VOP_SETATTR(vp, vap, td->td_ucred);
4463 #ifdef MAC
4464 }
4465 #endif
4466 vn_finished_write(mp);
4467 if (error)
4468 goto bad;
4469 }
4470 error = VOP_OPEN(vp, fmode, td->td_ucred, td, NULL);
4471 if (error)
4472 goto bad;
4473
4474 if (fmode & FWRITE)
4475 vp->v_writecount++;
4476
4477 /*
4478 * end of vn_open code
4479 */
4480
4481 if ((error = falloc(td, &nfp, &indx)) != 0) {
4482 if (fmode & FWRITE)
4483 vp->v_writecount--;
4484 goto bad;
4485 }
4486 /* An extra reference on `nfp' has been held for us by falloc(). */
4487 fp = nfp;
4488 nfp->f_vnode = vp;
4489 finit(nfp, fmode & FMASK, DTYPE_VNODE, vp, &vnops);
4490 if (fmode & (O_EXLOCK | O_SHLOCK)) {
4491 lf.l_whence = SEEK_SET;
4492 lf.l_start = 0;
4493 lf.l_len = 0;
4494 if (fmode & O_EXLOCK)
4495 lf.l_type = F_WRLCK;
4496 else
4497 lf.l_type = F_RDLCK;
4498 type = F_FLOCK;
4499 if ((fmode & FNONBLOCK) == 0)
4500 type |= F_WAIT;
4501 VOP_UNLOCK(vp, 0);
4502 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
4503 type)) != 0) {
4504 /*
4505 * The lock request failed. Normally close the
4506 * descriptor but handle the case where someone might
4507 * have dup()d or close()d it when we weren't looking.
4508 */
4509 fdclose(fdp, fp, indx, td);
4510
4511 /*
4512 * release our private reference
4513 */
4514 fdrop(fp, td);
4515 goto out;
4516 }
4517 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
4518 atomic_set_int(&fp->f_flag, FHASLOCK);
4519 }
4520
4521 VOP_UNLOCK(vp, 0);
4522 fdrop(fp, td);
4523 VFS_UNLOCK_GIANT(vfslocked);
4524 td->td_retval[0] = indx;
4525 return (0);
4526
4527 bad:
4528 vput(vp);
4529 out:
4530 VFS_UNLOCK_GIANT(vfslocked);
4531 return (error);
4532 }
4533
4534 /*
4535 * Stat an (NFS) file handle.
4536 */
4537 #ifndef _SYS_SYSPROTO_H_
4538 struct fhstat_args {
4539 struct fhandle *u_fhp;
4540 struct stat *sb;
4541 };
4542 #endif
4543 int
4544 fhstat(td, uap)
4545 struct thread *td;
4546 register struct fhstat_args /* {
4547 struct fhandle *u_fhp;
4548 struct stat *sb;
4549 } */ *uap;
4550 {
4551 struct stat sb;
4552 fhandle_t fh;
4553 struct mount *mp;
4554 struct vnode *vp;
4555 int vfslocked;
4556 int error;
4557
4558 error = priv_check(td, PRIV_VFS_FHSTAT);
4559 if (error)
4560 return (error);
4561 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4562 if (error)
4563 return (error);
4564 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4565 return (ESTALE);
4566 vfslocked = VFS_LOCK_GIANT(mp);
4567 error = VFS_FHTOVP(mp, &fh.fh_fid, &vp);
4568 vfs_unbusy(mp);
4569 if (error) {
4570 VFS_UNLOCK_GIANT(vfslocked);
4571 return (error);
4572 }
4573 error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
4574 vput(vp);
4575 VFS_UNLOCK_GIANT(vfslocked);
4576 if (error)
4577 return (error);
4578 error = copyout(&sb, uap->sb, sizeof(sb));
4579 return (error);
4580 }
4581
4582 /*
4583 * Implement fstatfs() for (NFS) file handles.
4584 */
4585 #ifndef _SYS_SYSPROTO_H_
4586 struct fhstatfs_args {
4587 struct fhandle *u_fhp;
4588 struct statfs *buf;
4589 };
4590 #endif
4591 int
4592 fhstatfs(td, uap)
4593 struct thread *td;
4594 struct fhstatfs_args /* {
4595 struct fhandle *u_fhp;
4596 struct statfs *buf;
4597 } */ *uap;
4598 {
4599 struct statfs sf;
4600 fhandle_t fh;
4601 int error;
4602
4603 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4604 if (error)
4605 return (error);
4606 error = kern_fhstatfs(td, fh, &sf);
4607 if (error)
4608 return (error);
4609 return (copyout(&sf, uap->buf, sizeof(sf)));
4610 }
4611
4612 int
4613 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4614 {
4615 struct statfs *sp;
4616 struct mount *mp;
4617 struct vnode *vp;
4618 int vfslocked;
4619 int error;
4620
4621 error = priv_check(td, PRIV_VFS_FHSTATFS);
4622 if (error)
4623 return (error);
4624 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4625 return (ESTALE);
4626 vfslocked = VFS_LOCK_GIANT(mp);
4627 error = VFS_FHTOVP(mp, &fh.fh_fid, &vp);
4628 if (error) {
4629 vfs_unbusy(mp);
4630 VFS_UNLOCK_GIANT(vfslocked);
4631 return (error);
4632 }
4633 vput(vp);
4634 error = prison_canseemount(td->td_ucred, mp);
4635 if (error)
4636 goto out;
4637 #ifdef MAC
4638 error = mac_mount_check_stat(td->td_ucred, mp);
4639 if (error)
4640 goto out;
4641 #endif
4642 /*
4643 * Set these in case the underlying filesystem fails to do so.
4644 */
4645 sp = &mp->mnt_stat;
4646 sp->f_version = STATFS_VERSION;
4647 sp->f_namemax = NAME_MAX;
4648 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4649 error = VFS_STATFS(mp, sp);
4650 if (error == 0)
4651 *buf = *sp;
4652 out:
4653 vfs_unbusy(mp);
4654 VFS_UNLOCK_GIANT(vfslocked);
4655 return (error);
4656 }
Cache object: 63eb2edeb340b273e08682038e841bb4
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