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/9.0/sys/kern/vfs_syscalls.c 228035 2011-11-27 19:02:18Z kib $");
39
40 #include "opt_capsicum.h"
41 #include "opt_compat.h"
42 #include "opt_kdtrace.h"
43 #include "opt_ktrace.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/bio.h>
48 #include <sys/buf.h>
49 #include <sys/capability.h>
50 #include <sys/disk.h>
51 #include <sys/sysent.h>
52 #include <sys/malloc.h>
53 #include <sys/mount.h>
54 #include <sys/mutex.h>
55 #include <sys/sysproto.h>
56 #include <sys/namei.h>
57 #include <sys/filedesc.h>
58 #include <sys/kernel.h>
59 #include <sys/fcntl.h>
60 #include <sys/file.h>
61 #include <sys/filio.h>
62 #include <sys/limits.h>
63 #include <sys/linker.h>
64 #include <sys/sdt.h>
65 #include <sys/stat.h>
66 #include <sys/sx.h>
67 #include <sys/unistd.h>
68 #include <sys/vnode.h>
69 #include <sys/priv.h>
70 #include <sys/proc.h>
71 #include <sys/dirent.h>
72 #include <sys/jail.h>
73 #include <sys/syscallsubr.h>
74 #include <sys/sysctl.h>
75 #ifdef KTRACE
76 #include <sys/ktrace.h>
77 #endif
78
79 #include <machine/stdarg.h>
80
81 #include <security/audit/audit.h>
82 #include <security/mac/mac_framework.h>
83
84 #include <vm/vm.h>
85 #include <vm/vm_object.h>
86 #include <vm/vm_page.h>
87 #include <vm/uma.h>
88
89 SDT_PROVIDER_DEFINE(vfs);
90 SDT_PROBE_DEFINE(vfs, , stat, mode, mode);
91 SDT_PROBE_ARGTYPE(vfs, , stat, mode, 0, "char *");
92 SDT_PROBE_ARGTYPE(vfs, , stat, mode, 1, "int");
93 SDT_PROBE_DEFINE(vfs, , stat, reg, reg);
94 SDT_PROBE_ARGTYPE(vfs, , stat, reg, 0, "char *");
95 SDT_PROBE_ARGTYPE(vfs, , stat, reg, 1, "int");
96
97 static int chroot_refuse_vdir_fds(struct filedesc *fdp);
98 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
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 sys_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 sys_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 sys_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 sys_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, CAP_FSTATFS, &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 sys_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 sys_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, CAP_FCHDIR, &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 sys_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 sys_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 static __inline cap_rights_t
995 flags_to_rights(int flags)
996 {
997 cap_rights_t rights = 0;
998
999 switch ((flags & O_ACCMODE)) {
1000 case O_RDONLY:
1001 rights |= CAP_READ;
1002 break;
1003
1004 case O_RDWR:
1005 rights |= CAP_READ;
1006 /* fall through */
1007
1008 case O_WRONLY:
1009 rights |= CAP_WRITE;
1010 break;
1011
1012 case O_EXEC:
1013 rights |= CAP_FEXECVE;
1014 break;
1015 }
1016
1017 if (flags & O_CREAT)
1018 rights |= CAP_CREATE;
1019
1020 if (flags & O_TRUNC)
1021 rights |= CAP_FTRUNCATE;
1022
1023 if ((flags & O_EXLOCK) || (flags & O_SHLOCK))
1024 rights |= CAP_FLOCK;
1025
1026 return (rights);
1027 }
1028
1029 /*
1030 * Check permissions, allocate an open file structure, and call the device
1031 * open routine if any.
1032 */
1033 #ifndef _SYS_SYSPROTO_H_
1034 struct open_args {
1035 char *path;
1036 int flags;
1037 int mode;
1038 };
1039 #endif
1040 int
1041 sys_open(td, uap)
1042 struct thread *td;
1043 register struct open_args /* {
1044 char *path;
1045 int flags;
1046 int mode;
1047 } */ *uap;
1048 {
1049
1050 return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
1051 }
1052
1053 #ifndef _SYS_SYSPROTO_H_
1054 struct openat_args {
1055 int fd;
1056 char *path;
1057 int flag;
1058 int mode;
1059 };
1060 #endif
1061 int
1062 sys_openat(struct thread *td, struct openat_args *uap)
1063 {
1064
1065 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1066 uap->mode));
1067 }
1068
1069 int
1070 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
1071 int mode)
1072 {
1073
1074 return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode));
1075 }
1076
1077 int
1078 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1079 int flags, int mode)
1080 {
1081 struct proc *p = td->td_proc;
1082 struct filedesc *fdp = p->p_fd;
1083 struct file *fp;
1084 struct vnode *vp;
1085 int cmode;
1086 struct file *nfp;
1087 int type, indx = -1, error, error_open;
1088 struct flock lf;
1089 struct nameidata nd;
1090 int vfslocked;
1091 cap_rights_t rights_needed = CAP_LOOKUP;
1092
1093 AUDIT_ARG_FFLAGS(flags);
1094 AUDIT_ARG_MODE(mode);
1095 /* XXX: audit dirfd */
1096 rights_needed |= flags_to_rights(flags);
1097 /*
1098 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1099 * may be specified.
1100 */
1101 if (flags & O_EXEC) {
1102 if (flags & O_ACCMODE)
1103 return (EINVAL);
1104 } else if ((flags & O_ACCMODE) == O_ACCMODE)
1105 return (EINVAL);
1106 else
1107 flags = FFLAGS(flags);
1108
1109 /*
1110 * allocate the file descriptor, but don't install a descriptor yet
1111 */
1112 error = falloc_noinstall(td, &nfp);
1113 if (error)
1114 return (error);
1115 /* An extra reference on `nfp' has been held for us by falloc_noinstall(). */
1116 fp = nfp;
1117 /* Set the flags early so the finit in devfs can pick them up. */
1118 fp->f_flag = flags & FMASK;
1119 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
1120 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | MPSAFE, pathseg,
1121 path, fd, rights_needed, td);
1122 td->td_dupfd = -1; /* XXX check for fdopen */
1123 error = vn_open(&nd, &flags, cmode, fp);
1124 if (error) {
1125 /*
1126 * If the vn_open replaced the method vector, something
1127 * wonderous happened deep below and we just pass it up
1128 * pretending we know what we do.
1129 */
1130 if (error == ENXIO && fp->f_ops != &badfileops)
1131 goto success;
1132
1133 /*
1134 * handle special fdopen() case. bleh. dupfdopen() is
1135 * responsible for dropping the old contents of ofiles[indx]
1136 * if it succeeds.
1137 *
1138 * Don't do this for relative (capability) lookups; we don't
1139 * understand exactly what would happen, and we don't think
1140 * that it ever should.
1141 */
1142 if ((nd.ni_strictrelative == 0) &&
1143 (error == ENODEV || error == ENXIO) &&
1144 (td->td_dupfd >= 0)) {
1145 /* XXX from fdopen */
1146 error_open = error;
1147 if ((error = finstall(td, fp, &indx, flags)) != 0)
1148 goto bad_unlocked;
1149 if ((error = dupfdopen(td, fdp, indx, td->td_dupfd,
1150 flags, error_open)) == 0)
1151 goto success;
1152 }
1153 /*
1154 * Clean up the descriptor, but only if another thread hadn't
1155 * replaced or closed it.
1156 */
1157 if (indx != -1)
1158 fdclose(fdp, fp, indx, td);
1159 fdrop(fp, td);
1160
1161 if (error == ERESTART)
1162 error = EINTR;
1163 return (error);
1164 }
1165 td->td_dupfd = 0;
1166 vfslocked = NDHASGIANT(&nd);
1167 NDFREE(&nd, NDF_ONLY_PNBUF);
1168 vp = nd.ni_vp;
1169
1170 /*
1171 * Store the vnode, for any f_type. Typically, the vnode use
1172 * count is decremented by direct call to vn_closefile() for
1173 * files that switched type in the cdevsw fdopen() method.
1174 */
1175 fp->f_vnode = vp;
1176 /*
1177 * If the file wasn't claimed by devfs bind it to the normal
1178 * vnode operations here.
1179 */
1180 if (fp->f_ops == &badfileops) {
1181 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
1182 fp->f_seqcount = 1;
1183 finit(fp, flags & FMASK, DTYPE_VNODE, vp, &vnops);
1184 }
1185
1186 VOP_UNLOCK(vp, 0);
1187 if (fp->f_type == DTYPE_VNODE && (flags & (O_EXLOCK | O_SHLOCK)) != 0) {
1188 lf.l_whence = SEEK_SET;
1189 lf.l_start = 0;
1190 lf.l_len = 0;
1191 if (flags & O_EXLOCK)
1192 lf.l_type = F_WRLCK;
1193 else
1194 lf.l_type = F_RDLCK;
1195 type = F_FLOCK;
1196 if ((flags & FNONBLOCK) == 0)
1197 type |= F_WAIT;
1198 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
1199 type)) != 0)
1200 goto bad;
1201 atomic_set_int(&fp->f_flag, FHASLOCK);
1202 }
1203 if (flags & O_TRUNC) {
1204 error = fo_truncate(fp, 0, td->td_ucred, td);
1205 if (error)
1206 goto bad;
1207 }
1208 VFS_UNLOCK_GIANT(vfslocked);
1209 success:
1210 /*
1211 * If we haven't already installed the FD (for dupfdopen), do so now.
1212 */
1213 if (indx == -1) {
1214 #ifdef CAPABILITIES
1215 if (nd.ni_strictrelative == 1) {
1216 /*
1217 * We are doing a strict relative lookup; wrap the
1218 * result in a capability.
1219 */
1220 if ((error = kern_capwrap(td, fp, nd.ni_baserights,
1221 &indx)) != 0)
1222 goto bad_unlocked;
1223 } else
1224 #endif
1225 if ((error = finstall(td, fp, &indx, flags)) != 0)
1226 goto bad_unlocked;
1227
1228 }
1229
1230 /*
1231 * Release our private reference, leaving the one associated with
1232 * the descriptor table intact.
1233 */
1234 fdrop(fp, td);
1235 td->td_retval[0] = indx;
1236 return (0);
1237 bad:
1238 VFS_UNLOCK_GIANT(vfslocked);
1239 bad_unlocked:
1240 if (indx != -1)
1241 fdclose(fdp, fp, indx, td);
1242 fdrop(fp, td);
1243 td->td_retval[0] = -1;
1244 return (error);
1245 }
1246
1247 #ifdef COMPAT_43
1248 /*
1249 * Create a file.
1250 */
1251 #ifndef _SYS_SYSPROTO_H_
1252 struct ocreat_args {
1253 char *path;
1254 int mode;
1255 };
1256 #endif
1257 int
1258 ocreat(td, uap)
1259 struct thread *td;
1260 register struct ocreat_args /* {
1261 char *path;
1262 int mode;
1263 } */ *uap;
1264 {
1265
1266 return (kern_open(td, uap->path, UIO_USERSPACE,
1267 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1268 }
1269 #endif /* COMPAT_43 */
1270
1271 /*
1272 * Create a special file.
1273 */
1274 #ifndef _SYS_SYSPROTO_H_
1275 struct mknod_args {
1276 char *path;
1277 int mode;
1278 int dev;
1279 };
1280 #endif
1281 int
1282 sys_mknod(td, uap)
1283 struct thread *td;
1284 register struct mknod_args /* {
1285 char *path;
1286 int mode;
1287 int dev;
1288 } */ *uap;
1289 {
1290
1291 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
1292 }
1293
1294 #ifndef _SYS_SYSPROTO_H_
1295 struct mknodat_args {
1296 int fd;
1297 char *path;
1298 mode_t mode;
1299 dev_t dev;
1300 };
1301 #endif
1302 int
1303 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1304 {
1305
1306 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1307 uap->dev));
1308 }
1309
1310 int
1311 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
1312 int dev)
1313 {
1314
1315 return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev));
1316 }
1317
1318 int
1319 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1320 int mode, int dev)
1321 {
1322 struct vnode *vp;
1323 struct mount *mp;
1324 struct vattr vattr;
1325 int error;
1326 int whiteout = 0;
1327 struct nameidata nd;
1328 int vfslocked;
1329
1330 AUDIT_ARG_MODE(mode);
1331 AUDIT_ARG_DEV(dev);
1332 switch (mode & S_IFMT) {
1333 case S_IFCHR:
1334 case S_IFBLK:
1335 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1336 break;
1337 case S_IFMT:
1338 error = priv_check(td, PRIV_VFS_MKNOD_BAD);
1339 break;
1340 case S_IFWHT:
1341 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1342 break;
1343 case S_IFIFO:
1344 if (dev == 0)
1345 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1346 /* FALLTHROUGH */
1347 default:
1348 error = EINVAL;
1349 break;
1350 }
1351 if (error)
1352 return (error);
1353 restart:
1354 bwillwrite();
1355 NDINIT_ATRIGHTS(&nd, CREATE,
1356 LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, pathseg, path, fd,
1357 CAP_MKFIFO, td);
1358 if ((error = namei(&nd)) != 0)
1359 return (error);
1360 vfslocked = NDHASGIANT(&nd);
1361 vp = nd.ni_vp;
1362 if (vp != NULL) {
1363 NDFREE(&nd, NDF_ONLY_PNBUF);
1364 if (vp == nd.ni_dvp)
1365 vrele(nd.ni_dvp);
1366 else
1367 vput(nd.ni_dvp);
1368 vrele(vp);
1369 VFS_UNLOCK_GIANT(vfslocked);
1370 return (EEXIST);
1371 } else {
1372 VATTR_NULL(&vattr);
1373 vattr.va_mode = (mode & ALLPERMS) &
1374 ~td->td_proc->p_fd->fd_cmask;
1375 vattr.va_rdev = dev;
1376 whiteout = 0;
1377
1378 switch (mode & S_IFMT) {
1379 case S_IFMT: /* used by badsect to flag bad sectors */
1380 vattr.va_type = VBAD;
1381 break;
1382 case S_IFCHR:
1383 vattr.va_type = VCHR;
1384 break;
1385 case S_IFBLK:
1386 vattr.va_type = VBLK;
1387 break;
1388 case S_IFWHT:
1389 whiteout = 1;
1390 break;
1391 default:
1392 panic("kern_mknod: invalid mode");
1393 }
1394 }
1395 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1396 NDFREE(&nd, NDF_ONLY_PNBUF);
1397 vput(nd.ni_dvp);
1398 VFS_UNLOCK_GIANT(vfslocked);
1399 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1400 return (error);
1401 goto restart;
1402 }
1403 #ifdef MAC
1404 if (error == 0 && !whiteout)
1405 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1406 &nd.ni_cnd, &vattr);
1407 #endif
1408 if (!error) {
1409 if (whiteout)
1410 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1411 else {
1412 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1413 &nd.ni_cnd, &vattr);
1414 if (error == 0)
1415 vput(nd.ni_vp);
1416 }
1417 }
1418 NDFREE(&nd, NDF_ONLY_PNBUF);
1419 vput(nd.ni_dvp);
1420 vn_finished_write(mp);
1421 VFS_UNLOCK_GIANT(vfslocked);
1422 return (error);
1423 }
1424
1425 /*
1426 * Create a named pipe.
1427 */
1428 #ifndef _SYS_SYSPROTO_H_
1429 struct mkfifo_args {
1430 char *path;
1431 int mode;
1432 };
1433 #endif
1434 int
1435 sys_mkfifo(td, uap)
1436 struct thread *td;
1437 register struct mkfifo_args /* {
1438 char *path;
1439 int mode;
1440 } */ *uap;
1441 {
1442
1443 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
1444 }
1445
1446 #ifndef _SYS_SYSPROTO_H_
1447 struct mkfifoat_args {
1448 int fd;
1449 char *path;
1450 mode_t mode;
1451 };
1452 #endif
1453 int
1454 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1455 {
1456
1457 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1458 uap->mode));
1459 }
1460
1461 int
1462 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
1463 {
1464
1465 return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode));
1466 }
1467
1468 int
1469 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1470 int mode)
1471 {
1472 struct mount *mp;
1473 struct vattr vattr;
1474 int error;
1475 struct nameidata nd;
1476 int vfslocked;
1477
1478 AUDIT_ARG_MODE(mode);
1479 restart:
1480 bwillwrite();
1481 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1,
1482 pathseg, path, fd, td);
1483 if ((error = namei(&nd)) != 0)
1484 return (error);
1485 vfslocked = NDHASGIANT(&nd);
1486 if (nd.ni_vp != NULL) {
1487 NDFREE(&nd, NDF_ONLY_PNBUF);
1488 if (nd.ni_vp == nd.ni_dvp)
1489 vrele(nd.ni_dvp);
1490 else
1491 vput(nd.ni_dvp);
1492 vrele(nd.ni_vp);
1493 VFS_UNLOCK_GIANT(vfslocked);
1494 return (EEXIST);
1495 }
1496 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1497 NDFREE(&nd, NDF_ONLY_PNBUF);
1498 vput(nd.ni_dvp);
1499 VFS_UNLOCK_GIANT(vfslocked);
1500 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1501 return (error);
1502 goto restart;
1503 }
1504 VATTR_NULL(&vattr);
1505 vattr.va_type = VFIFO;
1506 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1507 #ifdef MAC
1508 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1509 &vattr);
1510 if (error)
1511 goto out;
1512 #endif
1513 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1514 if (error == 0)
1515 vput(nd.ni_vp);
1516 #ifdef MAC
1517 out:
1518 #endif
1519 vput(nd.ni_dvp);
1520 vn_finished_write(mp);
1521 VFS_UNLOCK_GIANT(vfslocked);
1522 NDFREE(&nd, NDF_ONLY_PNBUF);
1523 return (error);
1524 }
1525
1526 /*
1527 * Make a hard file link.
1528 */
1529 #ifndef _SYS_SYSPROTO_H_
1530 struct link_args {
1531 char *path;
1532 char *link;
1533 };
1534 #endif
1535 int
1536 sys_link(td, uap)
1537 struct thread *td;
1538 register struct link_args /* {
1539 char *path;
1540 char *link;
1541 } */ *uap;
1542 {
1543
1544 return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
1545 }
1546
1547 #ifndef _SYS_SYSPROTO_H_
1548 struct linkat_args {
1549 int fd1;
1550 char *path1;
1551 int fd2;
1552 char *path2;
1553 int flag;
1554 };
1555 #endif
1556 int
1557 sys_linkat(struct thread *td, struct linkat_args *uap)
1558 {
1559 int flag;
1560
1561 flag = uap->flag;
1562 if (flag & ~AT_SYMLINK_FOLLOW)
1563 return (EINVAL);
1564
1565 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1566 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1567 }
1568
1569 int hardlink_check_uid = 0;
1570 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1571 &hardlink_check_uid, 0,
1572 "Unprivileged processes cannot create hard links to files owned by other "
1573 "users");
1574 static int hardlink_check_gid = 0;
1575 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1576 &hardlink_check_gid, 0,
1577 "Unprivileged processes cannot create hard links to files owned by other "
1578 "groups");
1579
1580 static int
1581 can_hardlink(struct vnode *vp, struct ucred *cred)
1582 {
1583 struct vattr va;
1584 int error;
1585
1586 if (!hardlink_check_uid && !hardlink_check_gid)
1587 return (0);
1588
1589 error = VOP_GETATTR(vp, &va, cred);
1590 if (error != 0)
1591 return (error);
1592
1593 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1594 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1595 if (error)
1596 return (error);
1597 }
1598
1599 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1600 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1601 if (error)
1602 return (error);
1603 }
1604
1605 return (0);
1606 }
1607
1608 int
1609 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
1610 {
1611
1612 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW));
1613 }
1614
1615 int
1616 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1617 enum uio_seg segflg, int follow)
1618 {
1619 struct vnode *vp;
1620 struct mount *mp;
1621 struct nameidata nd;
1622 int vfslocked;
1623 int lvfslocked;
1624 int error;
1625
1626 bwillwrite();
1627 NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, segflg, path1,
1628 fd1, td);
1629
1630 if ((error = namei(&nd)) != 0)
1631 return (error);
1632 vfslocked = NDHASGIANT(&nd);
1633 NDFREE(&nd, NDF_ONLY_PNBUF);
1634 vp = nd.ni_vp;
1635 if (vp->v_type == VDIR) {
1636 vrele(vp);
1637 VFS_UNLOCK_GIANT(vfslocked);
1638 return (EPERM); /* POSIX */
1639 }
1640 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
1641 vrele(vp);
1642 VFS_UNLOCK_GIANT(vfslocked);
1643 return (error);
1644 }
1645 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE2,
1646 segflg, path2, fd2, td);
1647 if ((error = namei(&nd)) == 0) {
1648 lvfslocked = NDHASGIANT(&nd);
1649 if (nd.ni_vp != NULL) {
1650 if (nd.ni_dvp == nd.ni_vp)
1651 vrele(nd.ni_dvp);
1652 else
1653 vput(nd.ni_dvp);
1654 vrele(nd.ni_vp);
1655 error = EEXIST;
1656 } else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY))
1657 == 0) {
1658 error = can_hardlink(vp, td->td_ucred);
1659 if (error == 0)
1660 #ifdef MAC
1661 error = mac_vnode_check_link(td->td_ucred,
1662 nd.ni_dvp, vp, &nd.ni_cnd);
1663 if (error == 0)
1664 #endif
1665 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1666 VOP_UNLOCK(vp, 0);
1667 vput(nd.ni_dvp);
1668 }
1669 NDFREE(&nd, NDF_ONLY_PNBUF);
1670 VFS_UNLOCK_GIANT(lvfslocked);
1671 }
1672 vrele(vp);
1673 vn_finished_write(mp);
1674 VFS_UNLOCK_GIANT(vfslocked);
1675 return (error);
1676 }
1677
1678 /*
1679 * Make a symbolic link.
1680 */
1681 #ifndef _SYS_SYSPROTO_H_
1682 struct symlink_args {
1683 char *path;
1684 char *link;
1685 };
1686 #endif
1687 int
1688 sys_symlink(td, uap)
1689 struct thread *td;
1690 register struct symlink_args /* {
1691 char *path;
1692 char *link;
1693 } */ *uap;
1694 {
1695
1696 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
1697 }
1698
1699 #ifndef _SYS_SYSPROTO_H_
1700 struct symlinkat_args {
1701 char *path;
1702 int fd;
1703 char *path2;
1704 };
1705 #endif
1706 int
1707 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1708 {
1709
1710 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1711 UIO_USERSPACE));
1712 }
1713
1714 int
1715 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
1716 {
1717
1718 return (kern_symlinkat(td, path, AT_FDCWD, link, segflg));
1719 }
1720
1721 int
1722 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1723 enum uio_seg segflg)
1724 {
1725 struct mount *mp;
1726 struct vattr vattr;
1727 char *syspath;
1728 int error;
1729 struct nameidata nd;
1730 int vfslocked;
1731
1732 if (segflg == UIO_SYSSPACE) {
1733 syspath = path1;
1734 } else {
1735 syspath = uma_zalloc(namei_zone, M_WAITOK);
1736 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1737 goto out;
1738 }
1739 AUDIT_ARG_TEXT(syspath);
1740 restart:
1741 bwillwrite();
1742 NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1,
1743 segflg, path2, fd, td);
1744 if ((error = namei(&nd)) != 0)
1745 goto out;
1746 vfslocked = NDHASGIANT(&nd);
1747 if (nd.ni_vp) {
1748 NDFREE(&nd, NDF_ONLY_PNBUF);
1749 if (nd.ni_vp == nd.ni_dvp)
1750 vrele(nd.ni_dvp);
1751 else
1752 vput(nd.ni_dvp);
1753 vrele(nd.ni_vp);
1754 VFS_UNLOCK_GIANT(vfslocked);
1755 error = EEXIST;
1756 goto out;
1757 }
1758 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1759 NDFREE(&nd, NDF_ONLY_PNBUF);
1760 vput(nd.ni_dvp);
1761 VFS_UNLOCK_GIANT(vfslocked);
1762 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1763 goto out;
1764 goto restart;
1765 }
1766 VATTR_NULL(&vattr);
1767 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1768 #ifdef MAC
1769 vattr.va_type = VLNK;
1770 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1771 &vattr);
1772 if (error)
1773 goto out2;
1774 #endif
1775 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1776 if (error == 0)
1777 vput(nd.ni_vp);
1778 #ifdef MAC
1779 out2:
1780 #endif
1781 NDFREE(&nd, NDF_ONLY_PNBUF);
1782 vput(nd.ni_dvp);
1783 vn_finished_write(mp);
1784 VFS_UNLOCK_GIANT(vfslocked);
1785 out:
1786 if (segflg != UIO_SYSSPACE)
1787 uma_zfree(namei_zone, syspath);
1788 return (error);
1789 }
1790
1791 /*
1792 * Delete a whiteout from the filesystem.
1793 */
1794 int
1795 sys_undelete(td, uap)
1796 struct thread *td;
1797 register struct undelete_args /* {
1798 char *path;
1799 } */ *uap;
1800 {
1801 int error;
1802 struct mount *mp;
1803 struct nameidata nd;
1804 int vfslocked;
1805
1806 restart:
1807 bwillwrite();
1808 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | MPSAFE | AUDITVNODE1,
1809 UIO_USERSPACE, uap->path, td);
1810 error = namei(&nd);
1811 if (error)
1812 return (error);
1813 vfslocked = NDHASGIANT(&nd);
1814
1815 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1816 NDFREE(&nd, NDF_ONLY_PNBUF);
1817 if (nd.ni_vp == nd.ni_dvp)
1818 vrele(nd.ni_dvp);
1819 else
1820 vput(nd.ni_dvp);
1821 if (nd.ni_vp)
1822 vrele(nd.ni_vp);
1823 VFS_UNLOCK_GIANT(vfslocked);
1824 return (EEXIST);
1825 }
1826 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1827 NDFREE(&nd, NDF_ONLY_PNBUF);
1828 vput(nd.ni_dvp);
1829 VFS_UNLOCK_GIANT(vfslocked);
1830 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1831 return (error);
1832 goto restart;
1833 }
1834 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1835 NDFREE(&nd, NDF_ONLY_PNBUF);
1836 vput(nd.ni_dvp);
1837 vn_finished_write(mp);
1838 VFS_UNLOCK_GIANT(vfslocked);
1839 return (error);
1840 }
1841
1842 /*
1843 * Delete a name from the filesystem.
1844 */
1845 #ifndef _SYS_SYSPROTO_H_
1846 struct unlink_args {
1847 char *path;
1848 };
1849 #endif
1850 int
1851 sys_unlink(td, uap)
1852 struct thread *td;
1853 struct unlink_args /* {
1854 char *path;
1855 } */ *uap;
1856 {
1857
1858 return (kern_unlink(td, uap->path, UIO_USERSPACE));
1859 }
1860
1861 #ifndef _SYS_SYSPROTO_H_
1862 struct unlinkat_args {
1863 int fd;
1864 char *path;
1865 int flag;
1866 };
1867 #endif
1868 int
1869 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1870 {
1871 int flag = uap->flag;
1872 int fd = uap->fd;
1873 char *path = uap->path;
1874
1875 if (flag & ~AT_REMOVEDIR)
1876 return (EINVAL);
1877
1878 if (flag & AT_REMOVEDIR)
1879 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1880 else
1881 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0));
1882 }
1883
1884 int
1885 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
1886 {
1887
1888 return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0));
1889 }
1890
1891 int
1892 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1893 ino_t oldinum)
1894 {
1895 struct mount *mp;
1896 struct vnode *vp;
1897 int error;
1898 struct nameidata nd;
1899 struct stat sb;
1900 int vfslocked;
1901
1902 restart:
1903 bwillwrite();
1904 NDINIT_AT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1,
1905 pathseg, path, fd, td);
1906 if ((error = namei(&nd)) != 0)
1907 return (error == EINVAL ? EPERM : error);
1908 vfslocked = NDHASGIANT(&nd);
1909 vp = nd.ni_vp;
1910 if (vp->v_type == VDIR && oldinum == 0) {
1911 error = EPERM; /* POSIX */
1912 } else if (oldinum != 0 &&
1913 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1914 sb.st_ino != oldinum) {
1915 error = EIDRM; /* Identifier removed */
1916 } else {
1917 /*
1918 * The root of a mounted filesystem cannot be deleted.
1919 *
1920 * XXX: can this only be a VDIR case?
1921 */
1922 if (vp->v_vflag & VV_ROOT)
1923 error = EBUSY;
1924 }
1925 if (error == 0) {
1926 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1927 NDFREE(&nd, NDF_ONLY_PNBUF);
1928 vput(nd.ni_dvp);
1929 if (vp == nd.ni_dvp)
1930 vrele(vp);
1931 else
1932 vput(vp);
1933 VFS_UNLOCK_GIANT(vfslocked);
1934 if ((error = vn_start_write(NULL, &mp,
1935 V_XSLEEP | PCATCH)) != 0)
1936 return (error);
1937 goto restart;
1938 }
1939 #ifdef MAC
1940 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1941 &nd.ni_cnd);
1942 if (error)
1943 goto out;
1944 #endif
1945 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1946 #ifdef MAC
1947 out:
1948 #endif
1949 vn_finished_write(mp);
1950 }
1951 NDFREE(&nd, NDF_ONLY_PNBUF);
1952 vput(nd.ni_dvp);
1953 if (vp == nd.ni_dvp)
1954 vrele(vp);
1955 else
1956 vput(vp);
1957 VFS_UNLOCK_GIANT(vfslocked);
1958 return (error);
1959 }
1960
1961 /*
1962 * Reposition read/write file offset.
1963 */
1964 #ifndef _SYS_SYSPROTO_H_
1965 struct lseek_args {
1966 int fd;
1967 int pad;
1968 off_t offset;
1969 int whence;
1970 };
1971 #endif
1972 int
1973 sys_lseek(td, uap)
1974 struct thread *td;
1975 register struct lseek_args /* {
1976 int fd;
1977 int pad;
1978 off_t offset;
1979 int whence;
1980 } */ *uap;
1981 {
1982 struct ucred *cred = td->td_ucred;
1983 struct file *fp;
1984 struct vnode *vp;
1985 struct vattr vattr;
1986 off_t offset, size;
1987 int error, noneg;
1988 int vfslocked;
1989
1990 AUDIT_ARG_FD(uap->fd);
1991 if ((error = fget(td, uap->fd, CAP_SEEK, &fp)) != 0)
1992 return (error);
1993 if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) {
1994 fdrop(fp, td);
1995 return (ESPIPE);
1996 }
1997 vp = fp->f_vnode;
1998 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1999 noneg = (vp->v_type != VCHR);
2000 offset = uap->offset;
2001 switch (uap->whence) {
2002 case L_INCR:
2003 if (noneg &&
2004 (fp->f_offset < 0 ||
2005 (offset > 0 && fp->f_offset > OFF_MAX - offset))) {
2006 error = EOVERFLOW;
2007 break;
2008 }
2009 offset += fp->f_offset;
2010 break;
2011 case L_XTND:
2012 vn_lock(vp, LK_SHARED | LK_RETRY);
2013 error = VOP_GETATTR(vp, &vattr, cred);
2014 VOP_UNLOCK(vp, 0);
2015 if (error)
2016 break;
2017
2018 /*
2019 * If the file references a disk device, then fetch
2020 * the media size and use that to determine the ending
2021 * offset.
2022 */
2023 if (vattr.va_size == 0 && vp->v_type == VCHR &&
2024 fo_ioctl(fp, DIOCGMEDIASIZE, &size, cred, td) == 0)
2025 vattr.va_size = size;
2026 if (noneg &&
2027 (vattr.va_size > OFF_MAX ||
2028 (offset > 0 && vattr.va_size > OFF_MAX - offset))) {
2029 error = EOVERFLOW;
2030 break;
2031 }
2032 offset += vattr.va_size;
2033 break;
2034 case L_SET:
2035 break;
2036 case SEEK_DATA:
2037 error = fo_ioctl(fp, FIOSEEKDATA, &offset, cred, td);
2038 break;
2039 case SEEK_HOLE:
2040 error = fo_ioctl(fp, FIOSEEKHOLE, &offset, cred, td);
2041 break;
2042 default:
2043 error = EINVAL;
2044 }
2045 if (error == 0 && noneg && offset < 0)
2046 error = EINVAL;
2047 if (error != 0)
2048 goto drop;
2049 fp->f_offset = offset;
2050 *(off_t *)(td->td_retval) = fp->f_offset;
2051 drop:
2052 fdrop(fp, td);
2053 VFS_UNLOCK_GIANT(vfslocked);
2054 return (error);
2055 }
2056
2057 #if defined(COMPAT_43)
2058 /*
2059 * Reposition read/write file offset.
2060 */
2061 #ifndef _SYS_SYSPROTO_H_
2062 struct olseek_args {
2063 int fd;
2064 long offset;
2065 int whence;
2066 };
2067 #endif
2068 int
2069 olseek(td, uap)
2070 struct thread *td;
2071 register struct olseek_args /* {
2072 int fd;
2073 long offset;
2074 int whence;
2075 } */ *uap;
2076 {
2077 struct lseek_args /* {
2078 int fd;
2079 int pad;
2080 off_t offset;
2081 int whence;
2082 } */ nuap;
2083
2084 nuap.fd = uap->fd;
2085 nuap.offset = uap->offset;
2086 nuap.whence = uap->whence;
2087 return (sys_lseek(td, &nuap));
2088 }
2089 #endif /* COMPAT_43 */
2090
2091 /* Version with the 'pad' argument */
2092 int
2093 freebsd6_lseek(td, uap)
2094 struct thread *td;
2095 register struct freebsd6_lseek_args *uap;
2096 {
2097 struct lseek_args ouap;
2098
2099 ouap.fd = uap->fd;
2100 ouap.offset = uap->offset;
2101 ouap.whence = uap->whence;
2102 return (sys_lseek(td, &ouap));
2103 }
2104
2105 /*
2106 * Check access permissions using passed credentials.
2107 */
2108 static int
2109 vn_access(vp, user_flags, cred, td)
2110 struct vnode *vp;
2111 int user_flags;
2112 struct ucred *cred;
2113 struct thread *td;
2114 {
2115 int error;
2116 accmode_t accmode;
2117
2118 /* Flags == 0 means only check for existence. */
2119 error = 0;
2120 if (user_flags) {
2121 accmode = 0;
2122 if (user_flags & R_OK)
2123 accmode |= VREAD;
2124 if (user_flags & W_OK)
2125 accmode |= VWRITE;
2126 if (user_flags & X_OK)
2127 accmode |= VEXEC;
2128 #ifdef MAC
2129 error = mac_vnode_check_access(cred, vp, accmode);
2130 if (error)
2131 return (error);
2132 #endif
2133 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
2134 error = VOP_ACCESS(vp, accmode, cred, td);
2135 }
2136 return (error);
2137 }
2138
2139 /*
2140 * Check access permissions using "real" credentials.
2141 */
2142 #ifndef _SYS_SYSPROTO_H_
2143 struct access_args {
2144 char *path;
2145 int flags;
2146 };
2147 #endif
2148 int
2149 sys_access(td, uap)
2150 struct thread *td;
2151 register struct access_args /* {
2152 char *path;
2153 int flags;
2154 } */ *uap;
2155 {
2156
2157 return (kern_access(td, uap->path, UIO_USERSPACE, uap->flags));
2158 }
2159
2160 #ifndef _SYS_SYSPROTO_H_
2161 struct faccessat_args {
2162 int dirfd;
2163 char *path;
2164 int mode;
2165 int flag;
2166 }
2167 #endif
2168 int
2169 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2170 {
2171
2172 if (uap->flag & ~AT_EACCESS)
2173 return (EINVAL);
2174 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2175 uap->mode));
2176 }
2177
2178 int
2179 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2180 {
2181
2182 return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, mode));
2183 }
2184
2185 int
2186 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2187 int flags, int mode)
2188 {
2189 struct ucred *cred, *tmpcred;
2190 struct vnode *vp;
2191 struct nameidata nd;
2192 int vfslocked;
2193 int error;
2194
2195 /*
2196 * Create and modify a temporary credential instead of one that
2197 * is potentially shared.
2198 */
2199 if (!(flags & AT_EACCESS)) {
2200 cred = td->td_ucred;
2201 tmpcred = crdup(cred);
2202 tmpcred->cr_uid = cred->cr_ruid;
2203 tmpcred->cr_groups[0] = cred->cr_rgid;
2204 td->td_ucred = tmpcred;
2205 } else
2206 cred = tmpcred = td->td_ucred;
2207 AUDIT_ARG_VALUE(mode);
2208 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
2209 AUDITVNODE1, pathseg, path, fd, CAP_FSTAT, td);
2210 if ((error = namei(&nd)) != 0)
2211 goto out1;
2212 vfslocked = NDHASGIANT(&nd);
2213 vp = nd.ni_vp;
2214
2215 error = vn_access(vp, mode, tmpcred, td);
2216 NDFREE(&nd, NDF_ONLY_PNBUF);
2217 vput(vp);
2218 VFS_UNLOCK_GIANT(vfslocked);
2219 out1:
2220 if (!(flags & AT_EACCESS)) {
2221 td->td_ucred = cred;
2222 crfree(tmpcred);
2223 }
2224 return (error);
2225 }
2226
2227 /*
2228 * Check access permissions using "effective" credentials.
2229 */
2230 #ifndef _SYS_SYSPROTO_H_
2231 struct eaccess_args {
2232 char *path;
2233 int flags;
2234 };
2235 #endif
2236 int
2237 sys_eaccess(td, uap)
2238 struct thread *td;
2239 register struct eaccess_args /* {
2240 char *path;
2241 int flags;
2242 } */ *uap;
2243 {
2244
2245 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->flags));
2246 }
2247
2248 int
2249 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int flags)
2250 {
2251
2252 return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, flags));
2253 }
2254
2255 #if defined(COMPAT_43)
2256 /*
2257 * Get file status; this version follows links.
2258 */
2259 #ifndef _SYS_SYSPROTO_H_
2260 struct ostat_args {
2261 char *path;
2262 struct ostat *ub;
2263 };
2264 #endif
2265 int
2266 ostat(td, uap)
2267 struct thread *td;
2268 register struct ostat_args /* {
2269 char *path;
2270 struct ostat *ub;
2271 } */ *uap;
2272 {
2273 struct stat sb;
2274 struct ostat osb;
2275 int error;
2276
2277 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2278 if (error)
2279 return (error);
2280 cvtstat(&sb, &osb);
2281 error = copyout(&osb, uap->ub, sizeof (osb));
2282 return (error);
2283 }
2284
2285 /*
2286 * Get file status; this version does not follow links.
2287 */
2288 #ifndef _SYS_SYSPROTO_H_
2289 struct olstat_args {
2290 char *path;
2291 struct ostat *ub;
2292 };
2293 #endif
2294 int
2295 olstat(td, uap)
2296 struct thread *td;
2297 register struct olstat_args /* {
2298 char *path;
2299 struct ostat *ub;
2300 } */ *uap;
2301 {
2302 struct stat sb;
2303 struct ostat osb;
2304 int error;
2305
2306 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2307 if (error)
2308 return (error);
2309 cvtstat(&sb, &osb);
2310 error = copyout(&osb, uap->ub, sizeof (osb));
2311 return (error);
2312 }
2313
2314 /*
2315 * Convert from an old to a new stat structure.
2316 */
2317 void
2318 cvtstat(st, ost)
2319 struct stat *st;
2320 struct ostat *ost;
2321 {
2322
2323 ost->st_dev = st->st_dev;
2324 ost->st_ino = st->st_ino;
2325 ost->st_mode = st->st_mode;
2326 ost->st_nlink = st->st_nlink;
2327 ost->st_uid = st->st_uid;
2328 ost->st_gid = st->st_gid;
2329 ost->st_rdev = st->st_rdev;
2330 if (st->st_size < (quad_t)1 << 32)
2331 ost->st_size = st->st_size;
2332 else
2333 ost->st_size = -2;
2334 ost->st_atim = st->st_atim;
2335 ost->st_mtim = st->st_mtim;
2336 ost->st_ctim = st->st_ctim;
2337 ost->st_blksize = st->st_blksize;
2338 ost->st_blocks = st->st_blocks;
2339 ost->st_flags = st->st_flags;
2340 ost->st_gen = st->st_gen;
2341 }
2342 #endif /* COMPAT_43 */
2343
2344 /*
2345 * Get file status; this version follows links.
2346 */
2347 #ifndef _SYS_SYSPROTO_H_
2348 struct stat_args {
2349 char *path;
2350 struct stat *ub;
2351 };
2352 #endif
2353 int
2354 sys_stat(td, uap)
2355 struct thread *td;
2356 register struct stat_args /* {
2357 char *path;
2358 struct stat *ub;
2359 } */ *uap;
2360 {
2361 struct stat sb;
2362 int error;
2363
2364 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2365 if (error == 0)
2366 error = copyout(&sb, uap->ub, sizeof (sb));
2367 return (error);
2368 }
2369
2370 #ifndef _SYS_SYSPROTO_H_
2371 struct fstatat_args {
2372 int fd;
2373 char *path;
2374 struct stat *buf;
2375 int flag;
2376 }
2377 #endif
2378 int
2379 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2380 {
2381 struct stat sb;
2382 int error;
2383
2384 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2385 UIO_USERSPACE, &sb);
2386 if (error == 0)
2387 error = copyout(&sb, uap->buf, sizeof (sb));
2388 return (error);
2389 }
2390
2391 int
2392 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2393 {
2394
2395 return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
2396 }
2397
2398 int
2399 kern_statat(struct thread *td, int flag, int fd, char *path,
2400 enum uio_seg pathseg, struct stat *sbp)
2401 {
2402
2403 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL));
2404 }
2405
2406 int
2407 kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
2408 enum uio_seg pathseg, struct stat *sbp,
2409 void (*hook)(struct vnode *vp, struct stat *sbp))
2410 {
2411 struct nameidata nd;
2412 struct stat sb;
2413 int error, vfslocked;
2414
2415 if (flag & ~AT_SYMLINK_NOFOLLOW)
2416 return (EINVAL);
2417
2418 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2419 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | MPSAFE, pathseg,
2420 path, fd, CAP_FSTAT, td);
2421
2422 if ((error = namei(&nd)) != 0)
2423 return (error);
2424 vfslocked = NDHASGIANT(&nd);
2425 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2426 if (!error) {
2427 SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0);
2428 if (S_ISREG(sb.st_mode))
2429 SDT_PROBE(vfs, , stat, reg, path, pathseg, 0, 0, 0);
2430 if (__predict_false(hook != NULL))
2431 hook(nd.ni_vp, &sb);
2432 }
2433 NDFREE(&nd, NDF_ONLY_PNBUF);
2434 vput(nd.ni_vp);
2435 VFS_UNLOCK_GIANT(vfslocked);
2436 if (error)
2437 return (error);
2438 *sbp = sb;
2439 #ifdef KTRACE
2440 if (KTRPOINT(td, KTR_STRUCT))
2441 ktrstat(&sb);
2442 #endif
2443 return (0);
2444 }
2445
2446 /*
2447 * Get file status; this version does not follow links.
2448 */
2449 #ifndef _SYS_SYSPROTO_H_
2450 struct lstat_args {
2451 char *path;
2452 struct stat *ub;
2453 };
2454 #endif
2455 int
2456 sys_lstat(td, uap)
2457 struct thread *td;
2458 register struct lstat_args /* {
2459 char *path;
2460 struct stat *ub;
2461 } */ *uap;
2462 {
2463 struct stat sb;
2464 int error;
2465
2466 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2467 if (error == 0)
2468 error = copyout(&sb, uap->ub, sizeof (sb));
2469 return (error);
2470 }
2471
2472 int
2473 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2474 {
2475
2476 return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg,
2477 sbp));
2478 }
2479
2480 /*
2481 * Implementation of the NetBSD [l]stat() functions.
2482 */
2483 void
2484 cvtnstat(sb, nsb)
2485 struct stat *sb;
2486 struct nstat *nsb;
2487 {
2488 bzero(nsb, sizeof *nsb);
2489 nsb->st_dev = sb->st_dev;
2490 nsb->st_ino = sb->st_ino;
2491 nsb->st_mode = sb->st_mode;
2492 nsb->st_nlink = sb->st_nlink;
2493 nsb->st_uid = sb->st_uid;
2494 nsb->st_gid = sb->st_gid;
2495 nsb->st_rdev = sb->st_rdev;
2496 nsb->st_atim = sb->st_atim;
2497 nsb->st_mtim = sb->st_mtim;
2498 nsb->st_ctim = sb->st_ctim;
2499 nsb->st_size = sb->st_size;
2500 nsb->st_blocks = sb->st_blocks;
2501 nsb->st_blksize = sb->st_blksize;
2502 nsb->st_flags = sb->st_flags;
2503 nsb->st_gen = sb->st_gen;
2504 nsb->st_birthtim = sb->st_birthtim;
2505 }
2506
2507 #ifndef _SYS_SYSPROTO_H_
2508 struct nstat_args {
2509 char *path;
2510 struct nstat *ub;
2511 };
2512 #endif
2513 int
2514 sys_nstat(td, uap)
2515 struct thread *td;
2516 register struct nstat_args /* {
2517 char *path;
2518 struct nstat *ub;
2519 } */ *uap;
2520 {
2521 struct stat sb;
2522 struct nstat nsb;
2523 int error;
2524
2525 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2526 if (error)
2527 return (error);
2528 cvtnstat(&sb, &nsb);
2529 error = copyout(&nsb, uap->ub, sizeof (nsb));
2530 return (error);
2531 }
2532
2533 /*
2534 * NetBSD lstat. Get file status; this version does not follow links.
2535 */
2536 #ifndef _SYS_SYSPROTO_H_
2537 struct lstat_args {
2538 char *path;
2539 struct stat *ub;
2540 };
2541 #endif
2542 int
2543 sys_nlstat(td, uap)
2544 struct thread *td;
2545 register struct nlstat_args /* {
2546 char *path;
2547 struct nstat *ub;
2548 } */ *uap;
2549 {
2550 struct stat sb;
2551 struct nstat nsb;
2552 int error;
2553
2554 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2555 if (error)
2556 return (error);
2557 cvtnstat(&sb, &nsb);
2558 error = copyout(&nsb, uap->ub, sizeof (nsb));
2559 return (error);
2560 }
2561
2562 /*
2563 * Get configurable pathname variables.
2564 */
2565 #ifndef _SYS_SYSPROTO_H_
2566 struct pathconf_args {
2567 char *path;
2568 int name;
2569 };
2570 #endif
2571 int
2572 sys_pathconf(td, uap)
2573 struct thread *td;
2574 register struct pathconf_args /* {
2575 char *path;
2576 int name;
2577 } */ *uap;
2578 {
2579
2580 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW));
2581 }
2582
2583 #ifndef _SYS_SYSPROTO_H_
2584 struct lpathconf_args {
2585 char *path;
2586 int name;
2587 };
2588 #endif
2589 int
2590 sys_lpathconf(td, uap)
2591 struct thread *td;
2592 register struct lpathconf_args /* {
2593 char *path;
2594 int name;
2595 } */ *uap;
2596 {
2597
2598 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, NOFOLLOW));
2599 }
2600
2601 int
2602 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2603 u_long flags)
2604 {
2605 struct nameidata nd;
2606 int error, vfslocked;
2607
2608 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1 |
2609 flags, pathseg, path, td);
2610 if ((error = namei(&nd)) != 0)
2611 return (error);
2612 vfslocked = NDHASGIANT(&nd);
2613 NDFREE(&nd, NDF_ONLY_PNBUF);
2614
2615 /* If asynchronous I/O is available, it works for all files. */
2616 if (name == _PC_ASYNC_IO)
2617 td->td_retval[0] = async_io_version;
2618 else
2619 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
2620 vput(nd.ni_vp);
2621 VFS_UNLOCK_GIANT(vfslocked);
2622 return (error);
2623 }
2624
2625 /*
2626 * Return target name of a symbolic link.
2627 */
2628 #ifndef _SYS_SYSPROTO_H_
2629 struct readlink_args {
2630 char *path;
2631 char *buf;
2632 size_t count;
2633 };
2634 #endif
2635 int
2636 sys_readlink(td, uap)
2637 struct thread *td;
2638 register struct readlink_args /* {
2639 char *path;
2640 char *buf;
2641 size_t count;
2642 } */ *uap;
2643 {
2644
2645 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
2646 UIO_USERSPACE, uap->count));
2647 }
2648 #ifndef _SYS_SYSPROTO_H_
2649 struct readlinkat_args {
2650 int fd;
2651 char *path;
2652 char *buf;
2653 size_t bufsize;
2654 };
2655 #endif
2656 int
2657 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2658 {
2659
2660 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2661 uap->buf, UIO_USERSPACE, uap->bufsize));
2662 }
2663
2664 int
2665 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
2666 enum uio_seg bufseg, size_t count)
2667 {
2668
2669 return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg,
2670 count));
2671 }
2672
2673 int
2674 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2675 char *buf, enum uio_seg bufseg, size_t count)
2676 {
2677 struct vnode *vp;
2678 struct iovec aiov;
2679 struct uio auio;
2680 int error;
2681 struct nameidata nd;
2682 int vfslocked;
2683
2684 if (count > INT_MAX)
2685 return (EINVAL);
2686
2687 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
2688 AUDITVNODE1, pathseg, path, fd, td);
2689
2690 if ((error = namei(&nd)) != 0)
2691 return (error);
2692 NDFREE(&nd, NDF_ONLY_PNBUF);
2693 vfslocked = NDHASGIANT(&nd);
2694 vp = nd.ni_vp;
2695 #ifdef MAC
2696 error = mac_vnode_check_readlink(td->td_ucred, vp);
2697 if (error) {
2698 vput(vp);
2699 VFS_UNLOCK_GIANT(vfslocked);
2700 return (error);
2701 }
2702 #endif
2703 if (vp->v_type != VLNK)
2704 error = EINVAL;
2705 else {
2706 aiov.iov_base = buf;
2707 aiov.iov_len = count;
2708 auio.uio_iov = &aiov;
2709 auio.uio_iovcnt = 1;
2710 auio.uio_offset = 0;
2711 auio.uio_rw = UIO_READ;
2712 auio.uio_segflg = bufseg;
2713 auio.uio_td = td;
2714 auio.uio_resid = count;
2715 error = VOP_READLINK(vp, &auio, td->td_ucred);
2716 }
2717 vput(vp);
2718 VFS_UNLOCK_GIANT(vfslocked);
2719 td->td_retval[0] = count - auio.uio_resid;
2720 return (error);
2721 }
2722
2723 /*
2724 * Common implementation code for chflags() and fchflags().
2725 */
2726 static int
2727 setfflags(td, vp, flags)
2728 struct thread *td;
2729 struct vnode *vp;
2730 int flags;
2731 {
2732 int error;
2733 struct mount *mp;
2734 struct vattr vattr;
2735
2736 /*
2737 * Prevent non-root users from setting flags on devices. When
2738 * a device is reused, users can retain ownership of the device
2739 * if they are allowed to set flags and programs assume that
2740 * chown can't fail when done as root.
2741 */
2742 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2743 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2744 if (error)
2745 return (error);
2746 }
2747
2748 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2749 return (error);
2750 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2751 VATTR_NULL(&vattr);
2752 vattr.va_flags = flags;
2753 #ifdef MAC
2754 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2755 if (error == 0)
2756 #endif
2757 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2758 VOP_UNLOCK(vp, 0);
2759 vn_finished_write(mp);
2760 return (error);
2761 }
2762
2763 /*
2764 * Change flags of a file given a path name.
2765 */
2766 #ifndef _SYS_SYSPROTO_H_
2767 struct chflags_args {
2768 char *path;
2769 int flags;
2770 };
2771 #endif
2772 int
2773 sys_chflags(td, uap)
2774 struct thread *td;
2775 register struct chflags_args /* {
2776 char *path;
2777 int flags;
2778 } */ *uap;
2779 {
2780 int error;
2781 struct nameidata nd;
2782 int vfslocked;
2783
2784 AUDIT_ARG_FFLAGS(uap->flags);
2785 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE,
2786 uap->path, td);
2787 if ((error = namei(&nd)) != 0)
2788 return (error);
2789 NDFREE(&nd, NDF_ONLY_PNBUF);
2790 vfslocked = NDHASGIANT(&nd);
2791 error = setfflags(td, nd.ni_vp, uap->flags);
2792 vrele(nd.ni_vp);
2793 VFS_UNLOCK_GIANT(vfslocked);
2794 return (error);
2795 }
2796
2797 /*
2798 * Same as chflags() but doesn't follow symlinks.
2799 */
2800 int
2801 sys_lchflags(td, uap)
2802 struct thread *td;
2803 register struct lchflags_args /* {
2804 char *path;
2805 int flags;
2806 } */ *uap;
2807 {
2808 int error;
2809 struct nameidata nd;
2810 int vfslocked;
2811
2812 AUDIT_ARG_FFLAGS(uap->flags);
2813 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE,
2814 uap->path, td);
2815 if ((error = namei(&nd)) != 0)
2816 return (error);
2817 vfslocked = NDHASGIANT(&nd);
2818 NDFREE(&nd, NDF_ONLY_PNBUF);
2819 error = setfflags(td, nd.ni_vp, uap->flags);
2820 vrele(nd.ni_vp);
2821 VFS_UNLOCK_GIANT(vfslocked);
2822 return (error);
2823 }
2824
2825 /*
2826 * Change flags of a file given a file descriptor.
2827 */
2828 #ifndef _SYS_SYSPROTO_H_
2829 struct fchflags_args {
2830 int fd;
2831 int flags;
2832 };
2833 #endif
2834 int
2835 sys_fchflags(td, uap)
2836 struct thread *td;
2837 register struct fchflags_args /* {
2838 int fd;
2839 int flags;
2840 } */ *uap;
2841 {
2842 struct file *fp;
2843 int vfslocked;
2844 int error;
2845
2846 AUDIT_ARG_FD(uap->fd);
2847 AUDIT_ARG_FFLAGS(uap->flags);
2848 if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_FCHFLAGS,
2849 &fp)) != 0)
2850 return (error);
2851 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
2852 #ifdef AUDIT
2853 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2854 AUDIT_ARG_VNODE1(fp->f_vnode);
2855 VOP_UNLOCK(fp->f_vnode, 0);
2856 #endif
2857 error = setfflags(td, fp->f_vnode, uap->flags);
2858 VFS_UNLOCK_GIANT(vfslocked);
2859 fdrop(fp, td);
2860 return (error);
2861 }
2862
2863 /*
2864 * Common implementation code for chmod(), lchmod() and fchmod().
2865 */
2866 int
2867 setfmode(td, cred, vp, mode)
2868 struct thread *td;
2869 struct ucred *cred;
2870 struct vnode *vp;
2871 int mode;
2872 {
2873 int error;
2874 struct mount *mp;
2875 struct vattr vattr;
2876
2877 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2878 return (error);
2879 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2880 VATTR_NULL(&vattr);
2881 vattr.va_mode = mode & ALLPERMS;
2882 #ifdef MAC
2883 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2884 if (error == 0)
2885 #endif
2886 error = VOP_SETATTR(vp, &vattr, cred);
2887 VOP_UNLOCK(vp, 0);
2888 vn_finished_write(mp);
2889 return (error);
2890 }
2891
2892 /*
2893 * Change mode of a file given path name.
2894 */
2895 #ifndef _SYS_SYSPROTO_H_
2896 struct chmod_args {
2897 char *path;
2898 int mode;
2899 };
2900 #endif
2901 int
2902 sys_chmod(td, uap)
2903 struct thread *td;
2904 register struct chmod_args /* {
2905 char *path;
2906 int mode;
2907 } */ *uap;
2908 {
2909
2910 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
2911 }
2912
2913 #ifndef _SYS_SYSPROTO_H_
2914 struct fchmodat_args {
2915 int dirfd;
2916 char *path;
2917 mode_t mode;
2918 int flag;
2919 }
2920 #endif
2921 int
2922 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2923 {
2924 int flag = uap->flag;
2925 int fd = uap->fd;
2926 char *path = uap->path;
2927 mode_t mode = uap->mode;
2928
2929 if (flag & ~AT_SYMLINK_NOFOLLOW)
2930 return (EINVAL);
2931
2932 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2933 }
2934
2935 int
2936 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2937 {
2938
2939 return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0));
2940 }
2941
2942 /*
2943 * Change mode of a file given path name (don't follow links.)
2944 */
2945 #ifndef _SYS_SYSPROTO_H_
2946 struct lchmod_args {
2947 char *path;
2948 int mode;
2949 };
2950 #endif
2951 int
2952 sys_lchmod(td, uap)
2953 struct thread *td;
2954 register struct lchmod_args /* {
2955 char *path;
2956 int mode;
2957 } */ *uap;
2958 {
2959
2960 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2961 uap->mode, AT_SYMLINK_NOFOLLOW));
2962 }
2963
2964
2965 int
2966 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2967 mode_t mode, int flag)
2968 {
2969 int error;
2970 struct nameidata nd;
2971 int vfslocked;
2972 int follow;
2973
2974 AUDIT_ARG_MODE(mode);
2975 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2976 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg,
2977 path, fd, CAP_FCHMOD, td);
2978 if ((error = namei(&nd)) != 0)
2979 return (error);
2980 vfslocked = NDHASGIANT(&nd);
2981 NDFREE(&nd, NDF_ONLY_PNBUF);
2982 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2983 vrele(nd.ni_vp);
2984 VFS_UNLOCK_GIANT(vfslocked);
2985 return (error);
2986 }
2987
2988 /*
2989 * Change mode of a file given a file descriptor.
2990 */
2991 #ifndef _SYS_SYSPROTO_H_
2992 struct fchmod_args {
2993 int fd;
2994 int mode;
2995 };
2996 #endif
2997 int
2998 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2999 {
3000 struct file *fp;
3001 int error;
3002
3003 AUDIT_ARG_FD(uap->fd);
3004 AUDIT_ARG_MODE(uap->mode);
3005
3006 error = fget(td, uap->fd, CAP_FCHMOD, &fp);
3007 if (error != 0)
3008 return (error);
3009 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
3010 fdrop(fp, td);
3011 return (error);
3012 }
3013
3014 /*
3015 * Common implementation for chown(), lchown(), and fchown()
3016 */
3017 int
3018 setfown(td, cred, vp, uid, gid)
3019 struct thread *td;
3020 struct ucred *cred;
3021 struct vnode *vp;
3022 uid_t uid;
3023 gid_t gid;
3024 {
3025 int error;
3026 struct mount *mp;
3027 struct vattr vattr;
3028
3029 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3030 return (error);
3031 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3032 VATTR_NULL(&vattr);
3033 vattr.va_uid = uid;
3034 vattr.va_gid = gid;
3035 #ifdef MAC
3036 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
3037 vattr.va_gid);
3038 if (error == 0)
3039 #endif
3040 error = VOP_SETATTR(vp, &vattr, cred);
3041 VOP_UNLOCK(vp, 0);
3042 vn_finished_write(mp);
3043 return (error);
3044 }
3045
3046 /*
3047 * Set ownership given a path name.
3048 */
3049 #ifndef _SYS_SYSPROTO_H_
3050 struct chown_args {
3051 char *path;
3052 int uid;
3053 int gid;
3054 };
3055 #endif
3056 int
3057 sys_chown(td, uap)
3058 struct thread *td;
3059 register struct chown_args /* {
3060 char *path;
3061 int uid;
3062 int gid;
3063 } */ *uap;
3064 {
3065
3066 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
3067 }
3068
3069 #ifndef _SYS_SYSPROTO_H_
3070 struct fchownat_args {
3071 int fd;
3072 const char * path;
3073 uid_t uid;
3074 gid_t gid;
3075 int flag;
3076 };
3077 #endif
3078 int
3079 sys_fchownat(struct thread *td, struct fchownat_args *uap)
3080 {
3081 int flag;
3082
3083 flag = uap->flag;
3084 if (flag & ~AT_SYMLINK_NOFOLLOW)
3085 return (EINVAL);
3086
3087 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
3088 uap->gid, uap->flag));
3089 }
3090
3091 int
3092 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3093 int gid)
3094 {
3095
3096 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0));
3097 }
3098
3099 int
3100 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3101 int uid, int gid, int flag)
3102 {
3103 struct nameidata nd;
3104 int error, vfslocked, follow;
3105
3106 AUDIT_ARG_OWNER(uid, gid);
3107 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
3108 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg,
3109 path, fd, CAP_FCHOWN, td);
3110
3111 if ((error = namei(&nd)) != 0)
3112 return (error);
3113 vfslocked = NDHASGIANT(&nd);
3114 NDFREE(&nd, NDF_ONLY_PNBUF);
3115 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
3116 vrele(nd.ni_vp);
3117 VFS_UNLOCK_GIANT(vfslocked);
3118 return (error);
3119 }
3120
3121 /*
3122 * Set ownership given a path name, do not cross symlinks.
3123 */
3124 #ifndef _SYS_SYSPROTO_H_
3125 struct lchown_args {
3126 char *path;
3127 int uid;
3128 int gid;
3129 };
3130 #endif
3131 int
3132 sys_lchown(td, uap)
3133 struct thread *td;
3134 register struct lchown_args /* {
3135 char *path;
3136 int uid;
3137 int gid;
3138 } */ *uap;
3139 {
3140
3141 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
3142 }
3143
3144 int
3145 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3146 int gid)
3147 {
3148
3149 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid,
3150 AT_SYMLINK_NOFOLLOW));
3151 }
3152
3153 /*
3154 * Set ownership given a file descriptor.
3155 */
3156 #ifndef _SYS_SYSPROTO_H_
3157 struct fchown_args {
3158 int fd;
3159 int uid;
3160 int gid;
3161 };
3162 #endif
3163 int
3164 sys_fchown(td, uap)
3165 struct thread *td;
3166 register struct fchown_args /* {
3167 int fd;
3168 int uid;
3169 int gid;
3170 } */ *uap;
3171 {
3172 struct file *fp;
3173 int error;
3174
3175 AUDIT_ARG_FD(uap->fd);
3176 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3177 error = fget(td, uap->fd, CAP_FCHOWN, &fp);
3178 if (error != 0)
3179 return (error);
3180 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3181 fdrop(fp, td);
3182 return (error);
3183 }
3184
3185 /*
3186 * Common implementation code for utimes(), lutimes(), and futimes().
3187 */
3188 static int
3189 getutimes(usrtvp, tvpseg, tsp)
3190 const struct timeval *usrtvp;
3191 enum uio_seg tvpseg;
3192 struct timespec *tsp;
3193 {
3194 struct timeval tv[2];
3195 const struct timeval *tvp;
3196 int error;
3197
3198 if (usrtvp == NULL) {
3199 vfs_timestamp(&tsp[0]);
3200 tsp[1] = tsp[0];
3201 } else {
3202 if (tvpseg == UIO_SYSSPACE) {
3203 tvp = usrtvp;
3204 } else {
3205 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3206 return (error);
3207 tvp = tv;
3208 }
3209
3210 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3211 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3212 return (EINVAL);
3213 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3214 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3215 }
3216 return (0);
3217 }
3218
3219 /*
3220 * Common implementation code for utimes(), lutimes(), and futimes().
3221 */
3222 static int
3223 setutimes(td, vp, ts, numtimes, nullflag)
3224 struct thread *td;
3225 struct vnode *vp;
3226 const struct timespec *ts;
3227 int numtimes;
3228 int nullflag;
3229 {
3230 int error, setbirthtime;
3231 struct mount *mp;
3232 struct vattr vattr;
3233
3234 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3235 return (error);
3236 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3237 setbirthtime = 0;
3238 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3239 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3240 setbirthtime = 1;
3241 VATTR_NULL(&vattr);
3242 vattr.va_atime = ts[0];
3243 vattr.va_mtime = ts[1];
3244 if (setbirthtime)
3245 vattr.va_birthtime = ts[1];
3246 if (numtimes > 2)
3247 vattr.va_birthtime = ts[2];
3248 if (nullflag)
3249 vattr.va_vaflags |= VA_UTIMES_NULL;
3250 #ifdef MAC
3251 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3252 vattr.va_mtime);
3253 #endif
3254 if (error == 0)
3255 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3256 VOP_UNLOCK(vp, 0);
3257 vn_finished_write(mp);
3258 return (error);
3259 }
3260
3261 /*
3262 * Set the access and modification times of a file.
3263 */
3264 #ifndef _SYS_SYSPROTO_H_
3265 struct utimes_args {
3266 char *path;
3267 struct timeval *tptr;
3268 };
3269 #endif
3270 int
3271 sys_utimes(td, uap)
3272 struct thread *td;
3273 register struct utimes_args /* {
3274 char *path;
3275 struct timeval *tptr;
3276 } */ *uap;
3277 {
3278
3279 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3280 UIO_USERSPACE));
3281 }
3282
3283 #ifndef _SYS_SYSPROTO_H_
3284 struct futimesat_args {
3285 int fd;
3286 const char * path;
3287 const struct timeval * times;
3288 };
3289 #endif
3290 int
3291 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3292 {
3293
3294 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3295 uap->times, UIO_USERSPACE));
3296 }
3297
3298 int
3299 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
3300 struct timeval *tptr, enum uio_seg tptrseg)
3301 {
3302
3303 return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg));
3304 }
3305
3306 int
3307 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3308 struct timeval *tptr, enum uio_seg tptrseg)
3309 {
3310 struct nameidata nd;
3311 struct timespec ts[2];
3312 int error, vfslocked;
3313
3314 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3315 return (error);
3316 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg,
3317 path, fd, CAP_FUTIMES, td);
3318
3319 if ((error = namei(&nd)) != 0)
3320 return (error);
3321 vfslocked = NDHASGIANT(&nd);
3322 NDFREE(&nd, NDF_ONLY_PNBUF);
3323 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3324 vrele(nd.ni_vp);
3325 VFS_UNLOCK_GIANT(vfslocked);
3326 return (error);
3327 }
3328
3329 /*
3330 * Set the access and modification times of a file.
3331 */
3332 #ifndef _SYS_SYSPROTO_H_
3333 struct lutimes_args {
3334 char *path;
3335 struct timeval *tptr;
3336 };
3337 #endif
3338 int
3339 sys_lutimes(td, uap)
3340 struct thread *td;
3341 register struct lutimes_args /* {
3342 char *path;
3343 struct timeval *tptr;
3344 } */ *uap;
3345 {
3346
3347 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3348 UIO_USERSPACE));
3349 }
3350
3351 int
3352 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
3353 struct timeval *tptr, enum uio_seg tptrseg)
3354 {
3355 struct timespec ts[2];
3356 int error;
3357 struct nameidata nd;
3358 int vfslocked;
3359
3360 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3361 return (error);
3362 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td);
3363 if ((error = namei(&nd)) != 0)
3364 return (error);
3365 vfslocked = NDHASGIANT(&nd);
3366 NDFREE(&nd, NDF_ONLY_PNBUF);
3367 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3368 vrele(nd.ni_vp);
3369 VFS_UNLOCK_GIANT(vfslocked);
3370 return (error);
3371 }
3372
3373 /*
3374 * Set the access and modification times of a file.
3375 */
3376 #ifndef _SYS_SYSPROTO_H_
3377 struct futimes_args {
3378 int fd;
3379 struct timeval *tptr;
3380 };
3381 #endif
3382 int
3383 sys_futimes(td, uap)
3384 struct thread *td;
3385 register struct futimes_args /* {
3386 int fd;
3387 struct timeval *tptr;
3388 } */ *uap;
3389 {
3390
3391 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3392 }
3393
3394 int
3395 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3396 enum uio_seg tptrseg)
3397 {
3398 struct timespec ts[2];
3399 struct file *fp;
3400 int vfslocked;
3401 int error;
3402
3403 AUDIT_ARG_FD(fd);
3404 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3405 return (error);
3406 if ((error = getvnode(td->td_proc->p_fd, fd, CAP_FUTIMES, &fp))
3407 != 0)
3408 return (error);
3409 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
3410 #ifdef AUDIT
3411 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3412 AUDIT_ARG_VNODE1(fp->f_vnode);
3413 VOP_UNLOCK(fp->f_vnode, 0);
3414 #endif
3415 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3416 VFS_UNLOCK_GIANT(vfslocked);
3417 fdrop(fp, td);
3418 return (error);
3419 }
3420
3421 /*
3422 * Truncate a file given its path name.
3423 */
3424 #ifndef _SYS_SYSPROTO_H_
3425 struct truncate_args {
3426 char *path;
3427 int pad;
3428 off_t length;
3429 };
3430 #endif
3431 int
3432 sys_truncate(td, uap)
3433 struct thread *td;
3434 register struct truncate_args /* {
3435 char *path;
3436 int pad;
3437 off_t length;
3438 } */ *uap;
3439 {
3440
3441 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3442 }
3443
3444 int
3445 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3446 {
3447 struct mount *mp;
3448 struct vnode *vp;
3449 struct vattr vattr;
3450 int error;
3451 struct nameidata nd;
3452 int vfslocked;
3453
3454 if (length < 0)
3455 return(EINVAL);
3456 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td);
3457 if ((error = namei(&nd)) != 0)
3458 return (error);
3459 vfslocked = NDHASGIANT(&nd);
3460 vp = nd.ni_vp;
3461 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3462 vrele(vp);
3463 VFS_UNLOCK_GIANT(vfslocked);
3464 return (error);
3465 }
3466 NDFREE(&nd, NDF_ONLY_PNBUF);
3467 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3468 if (vp->v_type == VDIR)
3469 error = EISDIR;
3470 #ifdef MAC
3471 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3472 }
3473 #endif
3474 else if ((error = vn_writechk(vp)) == 0 &&
3475 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3476 VATTR_NULL(&vattr);
3477 vattr.va_size = length;
3478 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3479 }
3480 vput(vp);
3481 vn_finished_write(mp);
3482 VFS_UNLOCK_GIANT(vfslocked);
3483 return (error);
3484 }
3485
3486 #if defined(COMPAT_43)
3487 /*
3488 * Truncate a file given its path name.
3489 */
3490 #ifndef _SYS_SYSPROTO_H_
3491 struct otruncate_args {
3492 char *path;
3493 long length;
3494 };
3495 #endif
3496 int
3497 otruncate(td, uap)
3498 struct thread *td;
3499 register struct otruncate_args /* {
3500 char *path;
3501 long length;
3502 } */ *uap;
3503 {
3504 struct truncate_args /* {
3505 char *path;
3506 int pad;
3507 off_t length;
3508 } */ nuap;
3509
3510 nuap.path = uap->path;
3511 nuap.length = uap->length;
3512 return (sys_truncate(td, &nuap));
3513 }
3514 #endif /* COMPAT_43 */
3515
3516 /* Versions with the pad argument */
3517 int
3518 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3519 {
3520 struct truncate_args ouap;
3521
3522 ouap.path = uap->path;
3523 ouap.length = uap->length;
3524 return (sys_truncate(td, &ouap));
3525 }
3526
3527 int
3528 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3529 {
3530 struct ftruncate_args ouap;
3531
3532 ouap.fd = uap->fd;
3533 ouap.length = uap->length;
3534 return (sys_ftruncate(td, &ouap));
3535 }
3536
3537 /*
3538 * Sync an open file.
3539 */
3540 #ifndef _SYS_SYSPROTO_H_
3541 struct fsync_args {
3542 int fd;
3543 };
3544 #endif
3545 int
3546 sys_fsync(td, uap)
3547 struct thread *td;
3548 struct fsync_args /* {
3549 int fd;
3550 } */ *uap;
3551 {
3552 struct vnode *vp;
3553 struct mount *mp;
3554 struct file *fp;
3555 int vfslocked;
3556 int error, lock_flags;
3557
3558 AUDIT_ARG_FD(uap->fd);
3559 if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_FSYNC,
3560 &fp)) != 0)
3561 return (error);
3562 vp = fp->f_vnode;
3563 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
3564 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3565 goto drop;
3566 if (MNT_SHARED_WRITES(mp) ||
3567 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3568 lock_flags = LK_SHARED;
3569 } else {
3570 lock_flags = LK_EXCLUSIVE;
3571 }
3572 vn_lock(vp, lock_flags | LK_RETRY);
3573 AUDIT_ARG_VNODE1(vp);
3574 if (vp->v_object != NULL) {
3575 VM_OBJECT_LOCK(vp->v_object);
3576 vm_object_page_clean(vp->v_object, 0, 0, 0);
3577 VM_OBJECT_UNLOCK(vp->v_object);
3578 }
3579 error = VOP_FSYNC(vp, MNT_WAIT, td);
3580
3581 VOP_UNLOCK(vp, 0);
3582 vn_finished_write(mp);
3583 drop:
3584 VFS_UNLOCK_GIANT(vfslocked);
3585 fdrop(fp, td);
3586 return (error);
3587 }
3588
3589 /*
3590 * Rename files. Source and destination must either both be directories, or
3591 * both not be directories. If target is a directory, it must be empty.
3592 */
3593 #ifndef _SYS_SYSPROTO_H_
3594 struct rename_args {
3595 char *from;
3596 char *to;
3597 };
3598 #endif
3599 int
3600 sys_rename(td, uap)
3601 struct thread *td;
3602 register struct rename_args /* {
3603 char *from;
3604 char *to;
3605 } */ *uap;
3606 {
3607
3608 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
3609 }
3610
3611 #ifndef _SYS_SYSPROTO_H_
3612 struct renameat_args {
3613 int oldfd;
3614 char *old;
3615 int newfd;
3616 char *new;
3617 };
3618 #endif
3619 int
3620 sys_renameat(struct thread *td, struct renameat_args *uap)
3621 {
3622
3623 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3624 UIO_USERSPACE));
3625 }
3626
3627 int
3628 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
3629 {
3630
3631 return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg));
3632 }
3633
3634 int
3635 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3636 enum uio_seg pathseg)
3637 {
3638 struct mount *mp = NULL;
3639 struct vnode *tvp, *fvp, *tdvp;
3640 struct nameidata fromnd, tond;
3641 int tvfslocked;
3642 int fvfslocked;
3643 int error;
3644
3645 bwillwrite();
3646 #ifdef MAC
3647 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3648 MPSAFE | AUDITVNODE1, pathseg, old, oldfd, CAP_DELETE, td);
3649 #else
3650 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | MPSAFE |
3651 AUDITVNODE1, pathseg, old, oldfd, CAP_DELETE, td);
3652 #endif
3653
3654 if ((error = namei(&fromnd)) != 0)
3655 return (error);
3656 fvfslocked = NDHASGIANT(&fromnd);
3657 tvfslocked = 0;
3658 #ifdef MAC
3659 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3660 fromnd.ni_vp, &fromnd.ni_cnd);
3661 VOP_UNLOCK(fromnd.ni_dvp, 0);
3662 if (fromnd.ni_dvp != fromnd.ni_vp)
3663 VOP_UNLOCK(fromnd.ni_vp, 0);
3664 #endif
3665 fvp = fromnd.ni_vp;
3666 if (error == 0)
3667 error = vn_start_write(fvp, &mp, V_WAIT | PCATCH);
3668 if (error != 0) {
3669 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3670 vrele(fromnd.ni_dvp);
3671 vrele(fvp);
3672 goto out1;
3673 }
3674 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
3675 SAVESTART | MPSAFE | AUDITVNODE2, pathseg, new, newfd, CAP_CREATE,
3676 td);
3677 if (fromnd.ni_vp->v_type == VDIR)
3678 tond.ni_cnd.cn_flags |= WILLBEDIR;
3679 if ((error = namei(&tond)) != 0) {
3680 /* Translate error code for rename("dir1", "dir2/."). */
3681 if (error == EISDIR && fvp->v_type == VDIR)
3682 error = EINVAL;
3683 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3684 vrele(fromnd.ni_dvp);
3685 vrele(fvp);
3686 vn_finished_write(mp);
3687 goto out1;
3688 }
3689 tvfslocked = NDHASGIANT(&tond);
3690 tdvp = tond.ni_dvp;
3691 tvp = tond.ni_vp;
3692 if (tvp != NULL) {
3693 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3694 error = ENOTDIR;
3695 goto out;
3696 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3697 error = EISDIR;
3698 goto out;
3699 }
3700 }
3701 if (fvp == tdvp) {
3702 error = EINVAL;
3703 goto out;
3704 }
3705 /*
3706 * If the source is the same as the destination (that is, if they
3707 * are links to the same vnode), then there is nothing to do.
3708 */
3709 if (fvp == tvp)
3710 error = -1;
3711 #ifdef MAC
3712 else
3713 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3714 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3715 #endif
3716 out:
3717 if (!error) {
3718 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3719 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3720 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3721 NDFREE(&tond, NDF_ONLY_PNBUF);
3722 } else {
3723 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3724 NDFREE(&tond, NDF_ONLY_PNBUF);
3725 if (tvp)
3726 vput(tvp);
3727 if (tdvp == tvp)
3728 vrele(tdvp);
3729 else
3730 vput(tdvp);
3731 vrele(fromnd.ni_dvp);
3732 vrele(fvp);
3733 }
3734 vrele(tond.ni_startdir);
3735 vn_finished_write(mp);
3736 out1:
3737 if (fromnd.ni_startdir)
3738 vrele(fromnd.ni_startdir);
3739 VFS_UNLOCK_GIANT(fvfslocked);
3740 VFS_UNLOCK_GIANT(tvfslocked);
3741 if (error == -1)
3742 return (0);
3743 return (error);
3744 }
3745
3746 /*
3747 * Make a directory file.
3748 */
3749 #ifndef _SYS_SYSPROTO_H_
3750 struct mkdir_args {
3751 char *path;
3752 int mode;
3753 };
3754 #endif
3755 int
3756 sys_mkdir(td, uap)
3757 struct thread *td;
3758 register struct mkdir_args /* {
3759 char *path;
3760 int mode;
3761 } */ *uap;
3762 {
3763
3764 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
3765 }
3766
3767 #ifndef _SYS_SYSPROTO_H_
3768 struct mkdirat_args {
3769 int fd;
3770 char *path;
3771 mode_t mode;
3772 };
3773 #endif
3774 int
3775 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3776 {
3777
3778 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3779 }
3780
3781 int
3782 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
3783 {
3784
3785 return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode));
3786 }
3787
3788 int
3789 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3790 int mode)
3791 {
3792 struct mount *mp;
3793 struct vnode *vp;
3794 struct vattr vattr;
3795 int error;
3796 struct nameidata nd;
3797 int vfslocked;
3798
3799 AUDIT_ARG_MODE(mode);
3800 restart:
3801 bwillwrite();
3802 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE |
3803 AUDITVNODE1, segflg, path, fd, CAP_MKDIR, td);
3804 nd.ni_cnd.cn_flags |= WILLBEDIR;
3805 if ((error = namei(&nd)) != 0)
3806 return (error);
3807 vfslocked = NDHASGIANT(&nd);
3808 vp = nd.ni_vp;
3809 if (vp != NULL) {
3810 NDFREE(&nd, NDF_ONLY_PNBUF);
3811 /*
3812 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3813 * the strange behaviour of leaving the vnode unlocked
3814 * if the target is the same vnode as the parent.
3815 */
3816 if (vp == nd.ni_dvp)
3817 vrele(nd.ni_dvp);
3818 else
3819 vput(nd.ni_dvp);
3820 vrele(vp);
3821 VFS_UNLOCK_GIANT(vfslocked);
3822 return (EEXIST);
3823 }
3824 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3825 NDFREE(&nd, NDF_ONLY_PNBUF);
3826 vput(nd.ni_dvp);
3827 VFS_UNLOCK_GIANT(vfslocked);
3828 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3829 return (error);
3830 goto restart;
3831 }
3832 VATTR_NULL(&vattr);
3833 vattr.va_type = VDIR;
3834 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3835 #ifdef MAC
3836 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3837 &vattr);
3838 if (error)
3839 goto out;
3840 #endif
3841 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3842 #ifdef MAC
3843 out:
3844 #endif
3845 NDFREE(&nd, NDF_ONLY_PNBUF);
3846 vput(nd.ni_dvp);
3847 if (!error)
3848 vput(nd.ni_vp);
3849 vn_finished_write(mp);
3850 VFS_UNLOCK_GIANT(vfslocked);
3851 return (error);
3852 }
3853
3854 /*
3855 * Remove a directory file.
3856 */
3857 #ifndef _SYS_SYSPROTO_H_
3858 struct rmdir_args {
3859 char *path;
3860 };
3861 #endif
3862 int
3863 sys_rmdir(td, uap)
3864 struct thread *td;
3865 struct rmdir_args /* {
3866 char *path;
3867 } */ *uap;
3868 {
3869
3870 return (kern_rmdir(td, uap->path, UIO_USERSPACE));
3871 }
3872
3873 int
3874 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
3875 {
3876
3877 return (kern_rmdirat(td, AT_FDCWD, path, pathseg));
3878 }
3879
3880 int
3881 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3882 {
3883 struct mount *mp;
3884 struct vnode *vp;
3885 int error;
3886 struct nameidata nd;
3887 int vfslocked;
3888
3889 restart:
3890 bwillwrite();
3891 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE |
3892 AUDITVNODE1, pathseg, path, fd, CAP_RMDIR, td);
3893 if ((error = namei(&nd)) != 0)
3894 return (error);
3895 vfslocked = NDHASGIANT(&nd);
3896 vp = nd.ni_vp;
3897 if (vp->v_type != VDIR) {
3898 error = ENOTDIR;
3899 goto out;
3900 }
3901 /*
3902 * No rmdir "." please.
3903 */
3904 if (nd.ni_dvp == vp) {
3905 error = EINVAL;
3906 goto out;
3907 }
3908 /*
3909 * The root of a mounted filesystem cannot be deleted.
3910 */
3911 if (vp->v_vflag & VV_ROOT) {
3912 error = EBUSY;
3913 goto out;
3914 }
3915 #ifdef MAC
3916 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3917 &nd.ni_cnd);
3918 if (error)
3919 goto out;
3920 #endif
3921 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3922 NDFREE(&nd, NDF_ONLY_PNBUF);
3923 vput(vp);
3924 if (nd.ni_dvp == vp)
3925 vrele(nd.ni_dvp);
3926 else
3927 vput(nd.ni_dvp);
3928 VFS_UNLOCK_GIANT(vfslocked);
3929 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3930 return (error);
3931 goto restart;
3932 }
3933 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3934 vn_finished_write(mp);
3935 out:
3936 NDFREE(&nd, NDF_ONLY_PNBUF);
3937 vput(vp);
3938 if (nd.ni_dvp == vp)
3939 vrele(nd.ni_dvp);
3940 else
3941 vput(nd.ni_dvp);
3942 VFS_UNLOCK_GIANT(vfslocked);
3943 return (error);
3944 }
3945
3946 #ifdef COMPAT_43
3947 /*
3948 * Read a block of directory entries in a filesystem independent format.
3949 */
3950 #ifndef _SYS_SYSPROTO_H_
3951 struct ogetdirentries_args {
3952 int fd;
3953 char *buf;
3954 u_int count;
3955 long *basep;
3956 };
3957 #endif
3958 int
3959 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
3960 {
3961 long loff;
3962 int error;
3963
3964 error = kern_ogetdirentries(td, uap, &loff);
3965 if (error == 0)
3966 error = copyout(&loff, uap->basep, sizeof(long));
3967 return (error);
3968 }
3969
3970 int
3971 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
3972 long *ploff)
3973 {
3974 struct vnode *vp;
3975 struct file *fp;
3976 struct uio auio, kuio;
3977 struct iovec aiov, kiov;
3978 struct dirent *dp, *edp;
3979 caddr_t dirbuf;
3980 int error, eofflag, readcnt, vfslocked;
3981 long loff;
3982
3983 /* XXX arbitrary sanity limit on `count'. */
3984 if (uap->count > 64 * 1024)
3985 return (EINVAL);
3986 if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_READ,
3987 &fp)) != 0)
3988 return (error);
3989 if ((fp->f_flag & FREAD) == 0) {
3990 fdrop(fp, td);
3991 return (EBADF);
3992 }
3993 vp = fp->f_vnode;
3994 unionread:
3995 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
3996 if (vp->v_type != VDIR) {
3997 VFS_UNLOCK_GIANT(vfslocked);
3998 fdrop(fp, td);
3999 return (EINVAL);
4000 }
4001 aiov.iov_base = uap->buf;
4002 aiov.iov_len = uap->count;
4003 auio.uio_iov = &aiov;
4004 auio.uio_iovcnt = 1;
4005 auio.uio_rw = UIO_READ;
4006 auio.uio_segflg = UIO_USERSPACE;
4007 auio.uio_td = td;
4008 auio.uio_resid = uap->count;
4009 vn_lock(vp, LK_SHARED | LK_RETRY);
4010 loff = auio.uio_offset = fp->f_offset;
4011 #ifdef MAC
4012 error = mac_vnode_check_readdir(td->td_ucred, vp);
4013 if (error) {
4014 VOP_UNLOCK(vp, 0);
4015 VFS_UNLOCK_GIANT(vfslocked);
4016 fdrop(fp, td);
4017 return (error);
4018 }
4019 #endif
4020 # if (BYTE_ORDER != LITTLE_ENDIAN)
4021 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
4022 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
4023 NULL, NULL);
4024 fp->f_offset = auio.uio_offset;
4025 } else
4026 # endif
4027 {
4028 kuio = auio;
4029 kuio.uio_iov = &kiov;
4030 kuio.uio_segflg = UIO_SYSSPACE;
4031 kiov.iov_len = uap->count;
4032 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK);
4033 kiov.iov_base = dirbuf;
4034 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
4035 NULL, NULL);
4036 fp->f_offset = kuio.uio_offset;
4037 if (error == 0) {
4038 readcnt = uap->count - kuio.uio_resid;
4039 edp = (struct dirent *)&dirbuf[readcnt];
4040 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
4041 # if (BYTE_ORDER == LITTLE_ENDIAN)
4042 /*
4043 * The expected low byte of
4044 * dp->d_namlen is our dp->d_type.
4045 * The high MBZ byte of dp->d_namlen
4046 * is our dp->d_namlen.
4047 */
4048 dp->d_type = dp->d_namlen;
4049 dp->d_namlen = 0;
4050 # else
4051 /*
4052 * The dp->d_type is the high byte
4053 * of the expected dp->d_namlen,
4054 * so must be zero'ed.
4055 */
4056 dp->d_type = 0;
4057 # endif
4058 if (dp->d_reclen > 0) {
4059 dp = (struct dirent *)
4060 ((char *)dp + dp->d_reclen);
4061 } else {
4062 error = EIO;
4063 break;
4064 }
4065 }
4066 if (dp >= edp)
4067 error = uiomove(dirbuf, readcnt, &auio);
4068 }
4069 free(dirbuf, M_TEMP);
4070 }
4071 if (error) {
4072 VOP_UNLOCK(vp, 0);
4073 VFS_UNLOCK_GIANT(vfslocked);
4074 fdrop(fp, td);
4075 return (error);
4076 }
4077 if (uap->count == auio.uio_resid &&
4078 (vp->v_vflag & VV_ROOT) &&
4079 (vp->v_mount->mnt_flag & MNT_UNION)) {
4080 struct vnode *tvp = vp;
4081 vp = vp->v_mount->mnt_vnodecovered;
4082 VREF(vp);
4083 fp->f_vnode = vp;
4084 fp->f_data = vp;
4085 fp->f_offset = 0;
4086 vput(tvp);
4087 VFS_UNLOCK_GIANT(vfslocked);
4088 goto unionread;
4089 }
4090 VOP_UNLOCK(vp, 0);
4091 VFS_UNLOCK_GIANT(vfslocked);
4092 fdrop(fp, td);
4093 td->td_retval[0] = uap->count - auio.uio_resid;
4094 if (error == 0)
4095 *ploff = loff;
4096 return (error);
4097 }
4098 #endif /* COMPAT_43 */
4099
4100 /*
4101 * Read a block of directory entries in a filesystem independent format.
4102 */
4103 #ifndef _SYS_SYSPROTO_H_
4104 struct getdirentries_args {
4105 int fd;
4106 char *buf;
4107 u_int count;
4108 long *basep;
4109 };
4110 #endif
4111 int
4112 sys_getdirentries(td, uap)
4113 struct thread *td;
4114 register struct getdirentries_args /* {
4115 int fd;
4116 char *buf;
4117 u_int count;
4118 long *basep;
4119 } */ *uap;
4120 {
4121 long base;
4122 int error;
4123
4124 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base);
4125 if (error)
4126 return (error);
4127 if (uap->basep != NULL)
4128 error = copyout(&base, uap->basep, sizeof(long));
4129 return (error);
4130 }
4131
4132 int
4133 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count,
4134 long *basep)
4135 {
4136 struct vnode *vp;
4137 struct file *fp;
4138 struct uio auio;
4139 struct iovec aiov;
4140 int vfslocked;
4141 long loff;
4142 int error, eofflag;
4143
4144 AUDIT_ARG_FD(fd);
4145 if (count > INT_MAX)
4146 return (EINVAL);
4147 if ((error = getvnode(td->td_proc->p_fd, fd, CAP_READ | CAP_SEEK,
4148 &fp)) != 0)
4149 return (error);
4150 if ((fp->f_flag & FREAD) == 0) {
4151 fdrop(fp, td);
4152 return (EBADF);
4153 }
4154 vp = fp->f_vnode;
4155 unionread:
4156 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
4157 if (vp->v_type != VDIR) {
4158 VFS_UNLOCK_GIANT(vfslocked);
4159 error = EINVAL;
4160 goto fail;
4161 }
4162 aiov.iov_base = buf;
4163 aiov.iov_len = count;
4164 auio.uio_iov = &aiov;
4165 auio.uio_iovcnt = 1;
4166 auio.uio_rw = UIO_READ;
4167 auio.uio_segflg = UIO_USERSPACE;
4168 auio.uio_td = td;
4169 auio.uio_resid = count;
4170 vn_lock(vp, LK_SHARED | LK_RETRY);
4171 AUDIT_ARG_VNODE1(vp);
4172 loff = auio.uio_offset = fp->f_offset;
4173 #ifdef MAC
4174 error = mac_vnode_check_readdir(td->td_ucred, vp);
4175 if (error == 0)
4176 #endif
4177 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4178 NULL);
4179 fp->f_offset = auio.uio_offset;
4180 if (error) {
4181 VOP_UNLOCK(vp, 0);
4182 VFS_UNLOCK_GIANT(vfslocked);
4183 goto fail;
4184 }
4185 if (count == auio.uio_resid &&
4186 (vp->v_vflag & VV_ROOT) &&
4187 (vp->v_mount->mnt_flag & MNT_UNION)) {
4188 struct vnode *tvp = vp;
4189 vp = vp->v_mount->mnt_vnodecovered;
4190 VREF(vp);
4191 fp->f_vnode = vp;
4192 fp->f_data = vp;
4193 fp->f_offset = 0;
4194 vput(tvp);
4195 VFS_UNLOCK_GIANT(vfslocked);
4196 goto unionread;
4197 }
4198 VOP_UNLOCK(vp, 0);
4199 VFS_UNLOCK_GIANT(vfslocked);
4200 *basep = loff;
4201 td->td_retval[0] = count - auio.uio_resid;
4202 fail:
4203 fdrop(fp, td);
4204 return (error);
4205 }
4206
4207 #ifndef _SYS_SYSPROTO_H_
4208 struct getdents_args {
4209 int fd;
4210 char *buf;
4211 size_t count;
4212 };
4213 #endif
4214 int
4215 sys_getdents(td, uap)
4216 struct thread *td;
4217 register struct getdents_args /* {
4218 int fd;
4219 char *buf;
4220 u_int count;
4221 } */ *uap;
4222 {
4223 struct getdirentries_args ap;
4224 ap.fd = uap->fd;
4225 ap.buf = uap->buf;
4226 ap.count = uap->count;
4227 ap.basep = NULL;
4228 return (sys_getdirentries(td, &ap));
4229 }
4230
4231 /*
4232 * Set the mode mask for creation of filesystem nodes.
4233 */
4234 #ifndef _SYS_SYSPROTO_H_
4235 struct umask_args {
4236 int newmask;
4237 };
4238 #endif
4239 int
4240 sys_umask(td, uap)
4241 struct thread *td;
4242 struct umask_args /* {
4243 int newmask;
4244 } */ *uap;
4245 {
4246 register struct filedesc *fdp;
4247
4248 FILEDESC_XLOCK(td->td_proc->p_fd);
4249 fdp = td->td_proc->p_fd;
4250 td->td_retval[0] = fdp->fd_cmask;
4251 fdp->fd_cmask = uap->newmask & ALLPERMS;
4252 FILEDESC_XUNLOCK(td->td_proc->p_fd);
4253 return (0);
4254 }
4255
4256 /*
4257 * Void all references to file by ripping underlying filesystem away from
4258 * vnode.
4259 */
4260 #ifndef _SYS_SYSPROTO_H_
4261 struct revoke_args {
4262 char *path;
4263 };
4264 #endif
4265 int
4266 sys_revoke(td, uap)
4267 struct thread *td;
4268 register struct revoke_args /* {
4269 char *path;
4270 } */ *uap;
4271 {
4272 struct vnode *vp;
4273 struct vattr vattr;
4274 int error;
4275 struct nameidata nd;
4276 int vfslocked;
4277
4278 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
4279 UIO_USERSPACE, uap->path, td);
4280 if ((error = namei(&nd)) != 0)
4281 return (error);
4282 vfslocked = NDHASGIANT(&nd);
4283 vp = nd.ni_vp;
4284 NDFREE(&nd, NDF_ONLY_PNBUF);
4285 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4286 error = EINVAL;
4287 goto out;
4288 }
4289 #ifdef MAC
4290 error = mac_vnode_check_revoke(td->td_ucred, vp);
4291 if (error)
4292 goto out;
4293 #endif
4294 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4295 if (error)
4296 goto out;
4297 if (td->td_ucred->cr_uid != vattr.va_uid) {
4298 error = priv_check(td, PRIV_VFS_ADMIN);
4299 if (error)
4300 goto out;
4301 }
4302 if (vcount(vp) > 1)
4303 VOP_REVOKE(vp, REVOKEALL);
4304 out:
4305 vput(vp);
4306 VFS_UNLOCK_GIANT(vfslocked);
4307 return (error);
4308 }
4309
4310 /*
4311 * Convert a user file descriptor to a kernel file entry and check that, if it
4312 * is a capability, the correct rights are present. A reference on the file
4313 * entry is held upon returning.
4314 */
4315 int
4316 getvnode(struct filedesc *fdp, int fd, cap_rights_t rights,
4317 struct file **fpp)
4318 {
4319 struct file *fp;
4320 #ifdef CAPABILITIES
4321 struct file *fp_fromcap;
4322 #endif
4323 int error;
4324
4325 error = 0;
4326 fp = NULL;
4327 if ((fdp == NULL) || (fp = fget_unlocked(fdp, fd)) == NULL)
4328 return (EBADF);
4329 #ifdef CAPABILITIES
4330 /*
4331 * If the file descriptor is for a capability, test rights and use the
4332 * file descriptor referenced by the capability.
4333 */
4334 error = cap_funwrap(fp, rights, &fp_fromcap);
4335 if (error) {
4336 fdrop(fp, curthread);
4337 return (error);
4338 }
4339 if (fp != fp_fromcap) {
4340 fhold(fp_fromcap);
4341 fdrop(fp, curthread);
4342 fp = fp_fromcap;
4343 }
4344 #endif /* CAPABILITIES */
4345
4346 /*
4347 * The file could be not of the vnode type, or it may be not
4348 * yet fully initialized, in which case the f_vnode pointer
4349 * may be set, but f_ops is still badfileops. E.g.,
4350 * devfs_open() transiently create such situation to
4351 * facilitate csw d_fdopen().
4352 *
4353 * Dupfdopen() handling in kern_openat() installs the
4354 * half-baked file into the process descriptor table, allowing
4355 * other thread to dereference it. Guard against the race by
4356 * checking f_ops.
4357 */
4358 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
4359 fdrop(fp, curthread);
4360 return (EINVAL);
4361 }
4362 *fpp = fp;
4363 return (0);
4364 }
4365
4366
4367 /*
4368 * Get an (NFS) file handle.
4369 */
4370 #ifndef _SYS_SYSPROTO_H_
4371 struct lgetfh_args {
4372 char *fname;
4373 fhandle_t *fhp;
4374 };
4375 #endif
4376 int
4377 sys_lgetfh(td, uap)
4378 struct thread *td;
4379 register struct lgetfh_args *uap;
4380 {
4381 struct nameidata nd;
4382 fhandle_t fh;
4383 register struct vnode *vp;
4384 int vfslocked;
4385 int error;
4386
4387 error = priv_check(td, PRIV_VFS_GETFH);
4388 if (error)
4389 return (error);
4390 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
4391 UIO_USERSPACE, uap->fname, td);
4392 error = namei(&nd);
4393 if (error)
4394 return (error);
4395 vfslocked = NDHASGIANT(&nd);
4396 NDFREE(&nd, NDF_ONLY_PNBUF);
4397 vp = nd.ni_vp;
4398 bzero(&fh, sizeof(fh));
4399 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4400 error = VOP_VPTOFH(vp, &fh.fh_fid);
4401 vput(vp);
4402 VFS_UNLOCK_GIANT(vfslocked);
4403 if (error)
4404 return (error);
4405 error = copyout(&fh, uap->fhp, sizeof (fh));
4406 return (error);
4407 }
4408
4409 #ifndef _SYS_SYSPROTO_H_
4410 struct getfh_args {
4411 char *fname;
4412 fhandle_t *fhp;
4413 };
4414 #endif
4415 int
4416 sys_getfh(td, uap)
4417 struct thread *td;
4418 register struct getfh_args *uap;
4419 {
4420 struct nameidata nd;
4421 fhandle_t fh;
4422 register struct vnode *vp;
4423 int vfslocked;
4424 int error;
4425
4426 error = priv_check(td, PRIV_VFS_GETFH);
4427 if (error)
4428 return (error);
4429 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
4430 UIO_USERSPACE, uap->fname, td);
4431 error = namei(&nd);
4432 if (error)
4433 return (error);
4434 vfslocked = NDHASGIANT(&nd);
4435 NDFREE(&nd, NDF_ONLY_PNBUF);
4436 vp = nd.ni_vp;
4437 bzero(&fh, sizeof(fh));
4438 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4439 error = VOP_VPTOFH(vp, &fh.fh_fid);
4440 vput(vp);
4441 VFS_UNLOCK_GIANT(vfslocked);
4442 if (error)
4443 return (error);
4444 error = copyout(&fh, uap->fhp, sizeof (fh));
4445 return (error);
4446 }
4447
4448 /*
4449 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4450 * open descriptor.
4451 *
4452 * warning: do not remove the priv_check() call or this becomes one giant
4453 * security hole.
4454 */
4455 #ifndef _SYS_SYSPROTO_H_
4456 struct fhopen_args {
4457 const struct fhandle *u_fhp;
4458 int flags;
4459 };
4460 #endif
4461 int
4462 sys_fhopen(td, uap)
4463 struct thread *td;
4464 struct fhopen_args /* {
4465 const struct fhandle *u_fhp;
4466 int flags;
4467 } */ *uap;
4468 {
4469 struct proc *p = td->td_proc;
4470 struct mount *mp;
4471 struct vnode *vp;
4472 struct fhandle fhp;
4473 struct vattr vat;
4474 struct vattr *vap = &vat;
4475 struct flock lf;
4476 struct file *fp;
4477 register struct filedesc *fdp = p->p_fd;
4478 int fmode, error, type;
4479 accmode_t accmode;
4480 struct file *nfp;
4481 int vfslocked;
4482 int indx;
4483
4484 error = priv_check(td, PRIV_VFS_FHOPEN);
4485 if (error)
4486 return (error);
4487 fmode = FFLAGS(uap->flags);
4488 /* why not allow a non-read/write open for our lockd? */
4489 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4490 return (EINVAL);
4491 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
4492 if (error)
4493 return(error);
4494 /* find the mount point */
4495 mp = vfs_busyfs(&fhp.fh_fsid);
4496 if (mp == NULL)
4497 return (ESTALE);
4498 vfslocked = VFS_LOCK_GIANT(mp);
4499 /* now give me my vnode, it gets returned to me locked */
4500 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4501 vfs_unbusy(mp);
4502 if (error)
4503 goto out;
4504 /*
4505 * from now on we have to make sure not
4506 * to forget about the vnode
4507 * any error that causes an abort must vput(vp)
4508 * just set error = err and 'goto bad;'.
4509 */
4510
4511 /*
4512 * from vn_open
4513 */
4514 if (vp->v_type == VLNK) {
4515 error = EMLINK;
4516 goto bad;
4517 }
4518 if (vp->v_type == VSOCK) {
4519 error = EOPNOTSUPP;
4520 goto bad;
4521 }
4522 if (vp->v_type != VDIR && fmode & O_DIRECTORY) {
4523 error = ENOTDIR;
4524 goto bad;
4525 }
4526 accmode = 0;
4527 if (fmode & (FWRITE | O_TRUNC)) {
4528 if (vp->v_type == VDIR) {
4529 error = EISDIR;
4530 goto bad;
4531 }
4532 error = vn_writechk(vp);
4533 if (error)
4534 goto bad;
4535 accmode |= VWRITE;
4536 }
4537 if (fmode & FREAD)
4538 accmode |= VREAD;
4539 if ((fmode & O_APPEND) && (fmode & FWRITE))
4540 accmode |= VAPPEND;
4541 #ifdef MAC
4542 error = mac_vnode_check_open(td->td_ucred, vp, accmode);
4543 if (error)
4544 goto bad;
4545 #endif
4546 if (accmode) {
4547 error = VOP_ACCESS(vp, accmode, td->td_ucred, td);
4548 if (error)
4549 goto bad;
4550 }
4551 if (fmode & O_TRUNC) {
4552 vfs_ref(mp);
4553 VOP_UNLOCK(vp, 0); /* XXX */
4554 if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) {
4555 vrele(vp);
4556 vfs_rel(mp);
4557 goto out;
4558 }
4559 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
4560 vfs_rel(mp);
4561 #ifdef MAC
4562 /*
4563 * We don't yet have fp->f_cred, so use td->td_ucred, which
4564 * should be right.
4565 */
4566 error = mac_vnode_check_write(td->td_ucred, td->td_ucred, vp);
4567 if (error == 0) {
4568 #endif
4569 VATTR_NULL(vap);
4570 vap->va_size = 0;
4571 error = VOP_SETATTR(vp, vap, td->td_ucred);
4572 #ifdef MAC
4573 }
4574 #endif
4575 vn_finished_write(mp);
4576 if (error)
4577 goto bad;
4578 }
4579 error = VOP_OPEN(vp, fmode, td->td_ucred, td, NULL);
4580 if (error)
4581 goto bad;
4582
4583 if (fmode & FWRITE)
4584 vp->v_writecount++;
4585
4586 /*
4587 * end of vn_open code
4588 */
4589
4590 if ((error = falloc(td, &nfp, &indx, fmode)) != 0) {
4591 if (fmode & FWRITE)
4592 vp->v_writecount--;
4593 goto bad;
4594 }
4595 /* An extra reference on `nfp' has been held for us by falloc(). */
4596 fp = nfp;
4597 nfp->f_vnode = vp;
4598 finit(nfp, fmode & FMASK, DTYPE_VNODE, vp, &vnops);
4599 if (fmode & (O_EXLOCK | O_SHLOCK)) {
4600 lf.l_whence = SEEK_SET;
4601 lf.l_start = 0;
4602 lf.l_len = 0;
4603 if (fmode & O_EXLOCK)
4604 lf.l_type = F_WRLCK;
4605 else
4606 lf.l_type = F_RDLCK;
4607 type = F_FLOCK;
4608 if ((fmode & FNONBLOCK) == 0)
4609 type |= F_WAIT;
4610 VOP_UNLOCK(vp, 0);
4611 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
4612 type)) != 0) {
4613 /*
4614 * The lock request failed. Normally close the
4615 * descriptor but handle the case where someone might
4616 * have dup()d or close()d it when we weren't looking.
4617 */
4618 fdclose(fdp, fp, indx, td);
4619
4620 /*
4621 * release our private reference
4622 */
4623 fdrop(fp, td);
4624 goto out;
4625 }
4626 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
4627 atomic_set_int(&fp->f_flag, FHASLOCK);
4628 }
4629
4630 VOP_UNLOCK(vp, 0);
4631 fdrop(fp, td);
4632 VFS_UNLOCK_GIANT(vfslocked);
4633 td->td_retval[0] = indx;
4634 return (0);
4635
4636 bad:
4637 vput(vp);
4638 out:
4639 VFS_UNLOCK_GIANT(vfslocked);
4640 return (error);
4641 }
4642
4643 /*
4644 * Stat an (NFS) file handle.
4645 */
4646 #ifndef _SYS_SYSPROTO_H_
4647 struct fhstat_args {
4648 struct fhandle *u_fhp;
4649 struct stat *sb;
4650 };
4651 #endif
4652 int
4653 sys_fhstat(td, uap)
4654 struct thread *td;
4655 register struct fhstat_args /* {
4656 struct fhandle *u_fhp;
4657 struct stat *sb;
4658 } */ *uap;
4659 {
4660 struct stat sb;
4661 fhandle_t fh;
4662 struct mount *mp;
4663 struct vnode *vp;
4664 int vfslocked;
4665 int error;
4666
4667 error = priv_check(td, PRIV_VFS_FHSTAT);
4668 if (error)
4669 return (error);
4670 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4671 if (error)
4672 return (error);
4673 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4674 return (ESTALE);
4675 vfslocked = VFS_LOCK_GIANT(mp);
4676 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4677 vfs_unbusy(mp);
4678 if (error) {
4679 VFS_UNLOCK_GIANT(vfslocked);
4680 return (error);
4681 }
4682 error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
4683 vput(vp);
4684 VFS_UNLOCK_GIANT(vfslocked);
4685 if (error)
4686 return (error);
4687 error = copyout(&sb, uap->sb, sizeof(sb));
4688 return (error);
4689 }
4690
4691 /*
4692 * Implement fstatfs() for (NFS) file handles.
4693 */
4694 #ifndef _SYS_SYSPROTO_H_
4695 struct fhstatfs_args {
4696 struct fhandle *u_fhp;
4697 struct statfs *buf;
4698 };
4699 #endif
4700 int
4701 sys_fhstatfs(td, uap)
4702 struct thread *td;
4703 struct fhstatfs_args /* {
4704 struct fhandle *u_fhp;
4705 struct statfs *buf;
4706 } */ *uap;
4707 {
4708 struct statfs sf;
4709 fhandle_t fh;
4710 int error;
4711
4712 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4713 if (error)
4714 return (error);
4715 error = kern_fhstatfs(td, fh, &sf);
4716 if (error)
4717 return (error);
4718 return (copyout(&sf, uap->buf, sizeof(sf)));
4719 }
4720
4721 int
4722 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4723 {
4724 struct statfs *sp;
4725 struct mount *mp;
4726 struct vnode *vp;
4727 int vfslocked;
4728 int error;
4729
4730 error = priv_check(td, PRIV_VFS_FHSTATFS);
4731 if (error)
4732 return (error);
4733 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4734 return (ESTALE);
4735 vfslocked = VFS_LOCK_GIANT(mp);
4736 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4737 if (error) {
4738 vfs_unbusy(mp);
4739 VFS_UNLOCK_GIANT(vfslocked);
4740 return (error);
4741 }
4742 vput(vp);
4743 error = prison_canseemount(td->td_ucred, mp);
4744 if (error)
4745 goto out;
4746 #ifdef MAC
4747 error = mac_mount_check_stat(td->td_ucred, mp);
4748 if (error)
4749 goto out;
4750 #endif
4751 /*
4752 * Set these in case the underlying filesystem fails to do so.
4753 */
4754 sp = &mp->mnt_stat;
4755 sp->f_version = STATFS_VERSION;
4756 sp->f_namemax = NAME_MAX;
4757 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4758 error = VFS_STATFS(mp, sp);
4759 if (error == 0)
4760 *buf = *sp;
4761 out:
4762 vfs_unbusy(mp);
4763 VFS_UNLOCK_GIANT(vfslocked);
4764 return (error);
4765 }
4766
4767 static int
4768 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
4769 {
4770 struct file *fp;
4771 struct mount *mp;
4772 struct vnode *vp;
4773 off_t olen, ooffset;
4774 int error, vfslocked;
4775
4776 fp = NULL;
4777 vfslocked = 0;
4778 error = fget(td, fd, CAP_WRITE, &fp);
4779 if (error != 0)
4780 goto out;
4781
4782 switch (fp->f_type) {
4783 case DTYPE_VNODE:
4784 break;
4785 case DTYPE_PIPE:
4786 case DTYPE_FIFO:
4787 error = ESPIPE;
4788 goto out;
4789 default:
4790 error = ENODEV;
4791 goto out;
4792 }
4793 if ((fp->f_flag & FWRITE) == 0) {
4794 error = EBADF;
4795 goto out;
4796 }
4797 vp = fp->f_vnode;
4798 if (vp->v_type != VREG) {
4799 error = ENODEV;
4800 goto out;
4801 }
4802 if (offset < 0 || len <= 0) {
4803 error = EINVAL;
4804 goto out;
4805 }
4806 /* Check for wrap. */
4807 if (offset > OFF_MAX - len) {
4808 error = EFBIG;
4809 goto out;
4810 }
4811
4812 /* Allocating blocks may take a long time, so iterate. */
4813 for (;;) {
4814 olen = len;
4815 ooffset = offset;
4816
4817 bwillwrite();
4818 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
4819 mp = NULL;
4820 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
4821 if (error != 0) {
4822 VFS_UNLOCK_GIANT(vfslocked);
4823 break;
4824 }
4825 error = vn_lock(vp, LK_EXCLUSIVE);
4826 if (error != 0) {
4827 vn_finished_write(mp);
4828 VFS_UNLOCK_GIANT(vfslocked);
4829 break;
4830 }
4831 #ifdef MAC
4832 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
4833 if (error == 0)
4834 #endif
4835 error = VOP_ALLOCATE(vp, &offset, &len);
4836 VOP_UNLOCK(vp, 0);
4837 vn_finished_write(mp);
4838 VFS_UNLOCK_GIANT(vfslocked);
4839
4840 if (olen + ooffset != offset + len) {
4841 panic("offset + len changed from %jx/%jx to %jx/%jx",
4842 ooffset, olen, offset, len);
4843 }
4844 if (error != 0 || len == 0)
4845 break;
4846 KASSERT(olen > len, ("Iteration did not make progress?"));
4847 maybe_yield();
4848 }
4849 out:
4850 if (fp != NULL)
4851 fdrop(fp, td);
4852 return (error);
4853 }
4854
4855 int
4856 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
4857 {
4858
4859 return (kern_posix_fallocate(td, uap->fd, uap->offset, uap->len));
4860 }
Cache object: dcdf587d5b418f38edddd952a696ca50
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