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("$FreeBSD$");
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/capsicum.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/rwlock.h>
65 #include <sys/sdt.h>
66 #include <sys/stat.h>
67 #include <sys/sx.h>
68 #include <sys/unistd.h>
69 #include <sys/vnode.h>
70 #include <sys/priv.h>
71 #include <sys/proc.h>
72 #include <sys/dirent.h>
73 #include <sys/jail.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysctl.h>
76 #ifdef KTRACE
77 #include <sys/ktrace.h>
78 #endif
79
80 #include <machine/stdarg.h>
81
82 #include <security/audit/audit.h>
83 #include <security/mac/mac_framework.h>
84
85 #include <vm/vm.h>
86 #include <vm/vm_object.h>
87 #include <vm/vm_page.h>
88 #include <vm/uma.h>
89
90 #include <ufs/ufs/quota.h>
91
92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
93
94 SDT_PROVIDER_DEFINE(vfs);
95 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int");
96 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int");
97
98 static int chroot_refuse_vdir_fds(struct filedesc *fdp);
99 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
100 static int kern_chflags(struct thread *td, const char *path,
101 enum uio_seg pathseg, u_long flags);
102 static int kern_chflagsat(struct thread *td, int fd, const char *path,
103 enum uio_seg pathseg, u_long flags, int atflag);
104 static int setfflags(struct thread *td, struct vnode *, u_long);
105 static int setutimes(struct thread *td, struct vnode *,
106 const struct timespec *, int, int);
107 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
108 struct thread *td);
109
110 /*
111 * The module initialization routine for POSIX asynchronous I/O will
112 * set this to the version of AIO that it implements. (Zero means
113 * that it is not implemented.) This value is used here by pathconf()
114 * and in kern_descrip.c by fpathconf().
115 */
116 int async_io_version;
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
sys_sync(td,uap)128 sys_sync(td, uap)
129 struct thread *td;
130 struct sync_args *uap;
131 {
132 struct mount *mp, *nmp;
133 int save;
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 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
142 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
143 save = curthread_pflags_set(TDP_SYNCIO);
144 vfs_msync(mp, MNT_NOWAIT);
145 VFS_SYNC(mp, MNT_NOWAIT);
146 curthread_pflags_restore(save);
147 vn_finished_write(mp);
148 }
149 mtx_lock(&mountlist_mtx);
150 nmp = TAILQ_NEXT(mp, mnt_list);
151 vfs_unbusy(mp);
152 }
153 mtx_unlock(&mountlist_mtx);
154 return (0);
155 }
156
157 /*
158 * Change filesystem quotas.
159 */
160 #ifndef _SYS_SYSPROTO_H_
161 struct quotactl_args {
162 char *path;
163 int cmd;
164 int uid;
165 caddr_t arg;
166 };
167 #endif
168 int
sys_quotactl(td,uap)169 sys_quotactl(td, uap)
170 struct thread *td;
171 register struct quotactl_args /* {
172 char *path;
173 int cmd;
174 int uid;
175 caddr_t arg;
176 } */ *uap;
177 {
178 struct mount *mp;
179 struct nameidata nd;
180 int error;
181
182 AUDIT_ARG_CMD(uap->cmd);
183 AUDIT_ARG_UID(uap->uid);
184 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
185 return (EPERM);
186 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
187 uap->path, td);
188 if ((error = namei(&nd)) != 0)
189 return (error);
190 NDFREE(&nd, NDF_ONLY_PNBUF);
191 mp = nd.ni_vp->v_mount;
192 vfs_ref(mp);
193 vput(nd.ni_vp);
194 error = vfs_busy(mp, 0);
195 vfs_rel(mp);
196 if (error != 0)
197 return (error);
198 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
199
200 /*
201 * Since quota on operation typically needs to open quota
202 * file, the Q_QUOTAON handler needs to unbusy the mount point
203 * before calling into namei. Otherwise, unmount might be
204 * started between two vfs_busy() invocations (first is our,
205 * second is from mount point cross-walk code in lookup()),
206 * causing deadlock.
207 *
208 * Require that Q_QUOTAON handles the vfs_busy() reference on
209 * its own, always returning with ubusied mount point.
210 */
211 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON)
212 vfs_unbusy(mp);
213 return (error);
214 }
215
216 /*
217 * Used by statfs conversion routines to scale the block size up if
218 * necessary so that all of the block counts are <= 'max_size'. Note
219 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
220 * value of 'n'.
221 */
222 void
statfs_scale_blocks(struct statfs * sf,long max_size)223 statfs_scale_blocks(struct statfs *sf, long max_size)
224 {
225 uint64_t count;
226 int shift;
227
228 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
229
230 /*
231 * Attempt to scale the block counts to give a more accurate
232 * overview to userland of the ratio of free space to used
233 * space. To do this, find the largest block count and compute
234 * a divisor that lets it fit into a signed integer <= max_size.
235 */
236 if (sf->f_bavail < 0)
237 count = -sf->f_bavail;
238 else
239 count = sf->f_bavail;
240 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
241 if (count <= max_size)
242 return;
243
244 count >>= flsl(max_size);
245 shift = 0;
246 while (count > 0) {
247 shift++;
248 count >>=1;
249 }
250
251 sf->f_bsize <<= shift;
252 sf->f_blocks >>= shift;
253 sf->f_bfree >>= shift;
254 sf->f_bavail >>= shift;
255 }
256
257 /*
258 * Get filesystem statistics.
259 */
260 #ifndef _SYS_SYSPROTO_H_
261 struct statfs_args {
262 char *path;
263 struct statfs *buf;
264 };
265 #endif
266 int
sys_statfs(td,uap)267 sys_statfs(td, uap)
268 struct thread *td;
269 register struct statfs_args /* {
270 char *path;
271 struct statfs *buf;
272 } */ *uap;
273 {
274 struct statfs sf;
275 int error;
276
277 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
278 if (error == 0)
279 error = copyout(&sf, uap->buf, sizeof(sf));
280 return (error);
281 }
282
283 int
kern_statfs(struct thread * td,char * path,enum uio_seg pathseg,struct statfs * buf)284 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
285 struct statfs *buf)
286 {
287 struct mount *mp;
288 struct statfs *sp, sb;
289 struct nameidata nd;
290 int error;
291
292 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
293 pathseg, path, td);
294 error = namei(&nd);
295 if (error != 0)
296 return (error);
297 mp = nd.ni_vp->v_mount;
298 vfs_ref(mp);
299 NDFREE(&nd, NDF_ONLY_PNBUF);
300 vput(nd.ni_vp);
301 error = vfs_busy(mp, 0);
302 vfs_rel(mp);
303 if (error != 0)
304 return (error);
305 #ifdef MAC
306 error = mac_mount_check_stat(td->td_ucred, mp);
307 if (error != 0)
308 goto out;
309 #endif
310 /*
311 * Set these in case the underlying filesystem fails to do so.
312 */
313 sp = &mp->mnt_stat;
314 sp->f_version = STATFS_VERSION;
315 sp->f_namemax = NAME_MAX;
316 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
317 error = VFS_STATFS(mp, sp);
318 if (error != 0)
319 goto out;
320 if (priv_check(td, PRIV_VFS_GENERATION)) {
321 bcopy(sp, &sb, sizeof(sb));
322 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
323 prison_enforce_statfs(td->td_ucred, mp, &sb);
324 sp = &sb;
325 }
326 *buf = *sp;
327 out:
328 vfs_unbusy(mp);
329 return (error);
330 }
331
332 /*
333 * Get filesystem statistics.
334 */
335 #ifndef _SYS_SYSPROTO_H_
336 struct fstatfs_args {
337 int fd;
338 struct statfs *buf;
339 };
340 #endif
341 int
sys_fstatfs(td,uap)342 sys_fstatfs(td, uap)
343 struct thread *td;
344 register struct fstatfs_args /* {
345 int fd;
346 struct statfs *buf;
347 } */ *uap;
348 {
349 struct statfs sf;
350 int error;
351
352 error = kern_fstatfs(td, uap->fd, &sf);
353 if (error == 0)
354 error = copyout(&sf, uap->buf, sizeof(sf));
355 return (error);
356 }
357
358 int
kern_fstatfs(struct thread * td,int fd,struct statfs * buf)359 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
360 {
361 struct file *fp;
362 struct mount *mp;
363 struct statfs *sp, sb;
364 struct vnode *vp;
365 cap_rights_t rights;
366 int error;
367
368 AUDIT_ARG_FD(fd);
369 error = getvnode(td->td_proc->p_fd, fd,
370 cap_rights_init(&rights, CAP_FSTATFS), &fp);
371 if (error != 0)
372 return (error);
373 vp = fp->f_vnode;
374 vn_lock(vp, LK_SHARED | LK_RETRY);
375 #ifdef AUDIT
376 AUDIT_ARG_VNODE1(vp);
377 #endif
378 mp = vp->v_mount;
379 if (mp)
380 vfs_ref(mp);
381 VOP_UNLOCK(vp, 0);
382 fdrop(fp, td);
383 if (mp == NULL) {
384 error = EBADF;
385 goto out;
386 }
387 error = vfs_busy(mp, 0);
388 vfs_rel(mp);
389 if (error != 0)
390 return (error);
391 #ifdef MAC
392 error = mac_mount_check_stat(td->td_ucred, mp);
393 if (error != 0)
394 goto out;
395 #endif
396 /*
397 * Set these in case the underlying filesystem fails to do so.
398 */
399 sp = &mp->mnt_stat;
400 sp->f_version = STATFS_VERSION;
401 sp->f_namemax = NAME_MAX;
402 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
403 error = VFS_STATFS(mp, sp);
404 if (error != 0)
405 goto out;
406 if (priv_check(td, PRIV_VFS_GENERATION)) {
407 bcopy(sp, &sb, sizeof(sb));
408 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
409 prison_enforce_statfs(td->td_ucred, mp, &sb);
410 sp = &sb;
411 }
412 *buf = *sp;
413 out:
414 if (mp)
415 vfs_unbusy(mp);
416 return (error);
417 }
418
419 /*
420 * Get statistics on all filesystems.
421 */
422 #ifndef _SYS_SYSPROTO_H_
423 struct getfsstat_args {
424 struct statfs *buf;
425 long bufsize;
426 int flags;
427 };
428 #endif
429 int
sys_getfsstat(td,uap)430 sys_getfsstat(td, uap)
431 struct thread *td;
432 register struct getfsstat_args /* {
433 struct statfs *buf;
434 long bufsize;
435 int flags;
436 } */ *uap;
437 {
438
439 return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE,
440 uap->flags));
441 }
442
443 /*
444 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
445 * The caller is responsible for freeing memory which will be allocated
446 * in '*buf'.
447 */
448 int
kern_getfsstat(struct thread * td,struct statfs ** buf,size_t bufsize,enum uio_seg bufseg,int flags)449 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
450 enum uio_seg bufseg, int flags)
451 {
452 struct mount *mp, *nmp;
453 struct statfs *sfsp, *sp, sb;
454 size_t count, maxcount;
455 int error;
456
457 maxcount = bufsize / sizeof(struct statfs);
458 if (bufsize == 0)
459 sfsp = NULL;
460 else if (bufseg == UIO_USERSPACE)
461 sfsp = *buf;
462 else /* if (bufseg == UIO_SYSSPACE) */ {
463 count = 0;
464 mtx_lock(&mountlist_mtx);
465 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
466 count++;
467 }
468 mtx_unlock(&mountlist_mtx);
469 if (maxcount > count)
470 maxcount = count;
471 sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP,
472 M_WAITOK);
473 }
474 count = 0;
475 mtx_lock(&mountlist_mtx);
476 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
477 if (prison_canseemount(td->td_ucred, mp) != 0) {
478 nmp = TAILQ_NEXT(mp, mnt_list);
479 continue;
480 }
481 #ifdef MAC
482 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
483 nmp = TAILQ_NEXT(mp, mnt_list);
484 continue;
485 }
486 #endif
487 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
488 nmp = TAILQ_NEXT(mp, mnt_list);
489 continue;
490 }
491 if (sfsp && count < maxcount) {
492 sp = &mp->mnt_stat;
493 /*
494 * Set these in case the underlying filesystem
495 * fails to do so.
496 */
497 sp->f_version = STATFS_VERSION;
498 sp->f_namemax = NAME_MAX;
499 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
500 /*
501 * If MNT_NOWAIT or MNT_LAZY is specified, do not
502 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
503 * overrides MNT_WAIT.
504 */
505 if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
506 (flags & MNT_WAIT)) &&
507 (error = VFS_STATFS(mp, sp))) {
508 mtx_lock(&mountlist_mtx);
509 nmp = TAILQ_NEXT(mp, mnt_list);
510 vfs_unbusy(mp);
511 continue;
512 }
513 if (priv_check(td, PRIV_VFS_GENERATION)) {
514 bcopy(sp, &sb, sizeof(sb));
515 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
516 prison_enforce_statfs(td->td_ucred, mp, &sb);
517 sp = &sb;
518 }
519 if (bufseg == UIO_SYSSPACE)
520 bcopy(sp, sfsp, sizeof(*sp));
521 else /* if (bufseg == UIO_USERSPACE) */ {
522 error = copyout(sp, sfsp, sizeof(*sp));
523 if (error != 0) {
524 vfs_unbusy(mp);
525 return (error);
526 }
527 }
528 sfsp++;
529 }
530 count++;
531 mtx_lock(&mountlist_mtx);
532 nmp = TAILQ_NEXT(mp, mnt_list);
533 vfs_unbusy(mp);
534 }
535 mtx_unlock(&mountlist_mtx);
536 if (sfsp && count > maxcount)
537 td->td_retval[0] = maxcount;
538 else
539 td->td_retval[0] = count;
540 return (0);
541 }
542
543 #ifdef COMPAT_FREEBSD4
544 /*
545 * Get old format filesystem statistics.
546 */
547 static void cvtstatfs(struct statfs *, struct ostatfs *);
548
549 #ifndef _SYS_SYSPROTO_H_
550 struct freebsd4_statfs_args {
551 char *path;
552 struct ostatfs *buf;
553 };
554 #endif
555 int
freebsd4_statfs(td,uap)556 freebsd4_statfs(td, uap)
557 struct thread *td;
558 struct freebsd4_statfs_args /* {
559 char *path;
560 struct ostatfs *buf;
561 } */ *uap;
562 {
563 struct ostatfs osb;
564 struct statfs sf;
565 int error;
566
567 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
568 if (error != 0)
569 return (error);
570 cvtstatfs(&sf, &osb);
571 return (copyout(&osb, uap->buf, sizeof(osb)));
572 }
573
574 /*
575 * Get filesystem statistics.
576 */
577 #ifndef _SYS_SYSPROTO_H_
578 struct freebsd4_fstatfs_args {
579 int fd;
580 struct ostatfs *buf;
581 };
582 #endif
583 int
freebsd4_fstatfs(td,uap)584 freebsd4_fstatfs(td, uap)
585 struct thread *td;
586 struct freebsd4_fstatfs_args /* {
587 int fd;
588 struct ostatfs *buf;
589 } */ *uap;
590 {
591 struct ostatfs osb;
592 struct statfs sf;
593 int error;
594
595 error = kern_fstatfs(td, uap->fd, &sf);
596 if (error != 0)
597 return (error);
598 cvtstatfs(&sf, &osb);
599 return (copyout(&osb, uap->buf, sizeof(osb)));
600 }
601
602 /*
603 * Get statistics on all filesystems.
604 */
605 #ifndef _SYS_SYSPROTO_H_
606 struct freebsd4_getfsstat_args {
607 struct ostatfs *buf;
608 long bufsize;
609 int flags;
610 };
611 #endif
612 int
freebsd4_getfsstat(td,uap)613 freebsd4_getfsstat(td, uap)
614 struct thread *td;
615 register struct freebsd4_getfsstat_args /* {
616 struct ostatfs *buf;
617 long bufsize;
618 int flags;
619 } */ *uap;
620 {
621 struct statfs *buf, *sp;
622 struct ostatfs osb;
623 size_t count, size;
624 int error;
625
626 count = uap->bufsize / sizeof(struct ostatfs);
627 size = count * sizeof(struct statfs);
628 error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags);
629 if (size > 0) {
630 count = td->td_retval[0];
631 sp = buf;
632 while (count > 0 && error == 0) {
633 cvtstatfs(sp, &osb);
634 error = copyout(&osb, uap->buf, sizeof(osb));
635 sp++;
636 uap->buf++;
637 count--;
638 }
639 free(buf, M_TEMP);
640 }
641 return (error);
642 }
643
644 /*
645 * Implement fstatfs() for (NFS) file handles.
646 */
647 #ifndef _SYS_SYSPROTO_H_
648 struct freebsd4_fhstatfs_args {
649 struct fhandle *u_fhp;
650 struct ostatfs *buf;
651 };
652 #endif
653 int
freebsd4_fhstatfs(td,uap)654 freebsd4_fhstatfs(td, uap)
655 struct thread *td;
656 struct freebsd4_fhstatfs_args /* {
657 struct fhandle *u_fhp;
658 struct ostatfs *buf;
659 } */ *uap;
660 {
661 struct ostatfs osb;
662 struct statfs sf;
663 fhandle_t fh;
664 int error;
665
666 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
667 if (error != 0)
668 return (error);
669 error = kern_fhstatfs(td, fh, &sf);
670 if (error != 0)
671 return (error);
672 cvtstatfs(&sf, &osb);
673 return (copyout(&osb, uap->buf, sizeof(osb)));
674 }
675
676 /*
677 * Convert a new format statfs structure to an old format statfs structure.
678 */
679 static void
cvtstatfs(nsp,osp)680 cvtstatfs(nsp, osp)
681 struct statfs *nsp;
682 struct ostatfs *osp;
683 {
684
685 statfs_scale_blocks(nsp, LONG_MAX);
686 bzero(osp, sizeof(*osp));
687 osp->f_bsize = nsp->f_bsize;
688 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
689 osp->f_blocks = nsp->f_blocks;
690 osp->f_bfree = nsp->f_bfree;
691 osp->f_bavail = nsp->f_bavail;
692 osp->f_files = MIN(nsp->f_files, LONG_MAX);
693 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
694 osp->f_owner = nsp->f_owner;
695 osp->f_type = nsp->f_type;
696 osp->f_flags = nsp->f_flags;
697 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
698 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
699 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
700 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
701 strlcpy(osp->f_fstypename, nsp->f_fstypename,
702 MIN(MFSNAMELEN, OMFSNAMELEN));
703 strlcpy(osp->f_mntonname, nsp->f_mntonname,
704 MIN(MNAMELEN, OMNAMELEN));
705 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
706 MIN(MNAMELEN, OMNAMELEN));
707 osp->f_fsid = nsp->f_fsid;
708 }
709 #endif /* COMPAT_FREEBSD4 */
710
711 /*
712 * Change current working directory to a given file descriptor.
713 */
714 #ifndef _SYS_SYSPROTO_H_
715 struct fchdir_args {
716 int fd;
717 };
718 #endif
719 int
sys_fchdir(td,uap)720 sys_fchdir(td, uap)
721 struct thread *td;
722 struct fchdir_args /* {
723 int fd;
724 } */ *uap;
725 {
726 register struct filedesc *fdp = td->td_proc->p_fd;
727 struct vnode *vp, *tdp, *vpold;
728 struct mount *mp;
729 struct file *fp;
730 cap_rights_t rights;
731 int error;
732
733 AUDIT_ARG_FD(uap->fd);
734 error = getvnode(fdp, uap->fd, cap_rights_init(&rights, CAP_FCHDIR),
735 &fp);
736 if (error != 0)
737 return (error);
738 vp = fp->f_vnode;
739 VREF(vp);
740 fdrop(fp, td);
741 vn_lock(vp, LK_SHARED | LK_RETRY);
742 AUDIT_ARG_VNODE1(vp);
743 error = change_dir(vp, td);
744 while (!error && (mp = vp->v_mountedhere) != NULL) {
745 if (vfs_busy(mp, 0))
746 continue;
747 error = VFS_ROOT(mp, LK_SHARED, &tdp);
748 vfs_unbusy(mp);
749 if (error != 0)
750 break;
751 vput(vp);
752 vp = tdp;
753 }
754 if (error != 0) {
755 vput(vp);
756 return (error);
757 }
758 VOP_UNLOCK(vp, 0);
759 FILEDESC_XLOCK(fdp);
760 vpold = fdp->fd_cdir;
761 fdp->fd_cdir = vp;
762 FILEDESC_XUNLOCK(fdp);
763 vrele(vpold);
764 return (0);
765 }
766
767 /*
768 * Change current working directory (``.'').
769 */
770 #ifndef _SYS_SYSPROTO_H_
771 struct chdir_args {
772 char *path;
773 };
774 #endif
775 int
sys_chdir(td,uap)776 sys_chdir(td, uap)
777 struct thread *td;
778 struct chdir_args /* {
779 char *path;
780 } */ *uap;
781 {
782
783 return (kern_chdir(td, uap->path, UIO_USERSPACE));
784 }
785
786 int
kern_chdir(struct thread * td,char * path,enum uio_seg pathseg)787 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
788 {
789 register struct filedesc *fdp = td->td_proc->p_fd;
790 struct nameidata nd;
791 struct vnode *vp;
792 int error;
793
794 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
795 pathseg, path, td);
796 if ((error = namei(&nd)) != 0)
797 return (error);
798 if ((error = change_dir(nd.ni_vp, td)) != 0) {
799 vput(nd.ni_vp);
800 NDFREE(&nd, NDF_ONLY_PNBUF);
801 return (error);
802 }
803 VOP_UNLOCK(nd.ni_vp, 0);
804 NDFREE(&nd, NDF_ONLY_PNBUF);
805 FILEDESC_XLOCK(fdp);
806 vp = fdp->fd_cdir;
807 fdp->fd_cdir = nd.ni_vp;
808 FILEDESC_XUNLOCK(fdp);
809 vrele(vp);
810 return (0);
811 }
812
813 /*
814 * Helper function for raised chroot(2) security function: Refuse if
815 * any filedescriptors are open directories.
816 */
817 static int
chroot_refuse_vdir_fds(fdp)818 chroot_refuse_vdir_fds(fdp)
819 struct filedesc *fdp;
820 {
821 struct vnode *vp;
822 struct file *fp;
823 int fd;
824
825 FILEDESC_LOCK_ASSERT(fdp);
826
827 for (fd = 0; fd <= fdp->fd_lastfile; fd++) {
828 fp = fget_locked(fdp, fd);
829 if (fp == NULL)
830 continue;
831 if (fp->f_type == DTYPE_VNODE) {
832 vp = fp->f_vnode;
833 if (vp->v_type == VDIR)
834 return (EPERM);
835 }
836 }
837 return (0);
838 }
839
840 /*
841 * This sysctl determines if we will allow a process to chroot(2) if it
842 * has a directory open:
843 * 0: disallowed for all processes.
844 * 1: allowed for processes that were not already chroot(2)'ed.
845 * 2: allowed for all processes.
846 */
847
848 static int chroot_allow_open_directories = 1;
849
850 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
851 &chroot_allow_open_directories, 0,
852 "Allow a process to chroot(2) if it has a directory open");
853
854 /*
855 * Change notion of root (``/'') directory.
856 */
857 #ifndef _SYS_SYSPROTO_H_
858 struct chroot_args {
859 char *path;
860 };
861 #endif
862 int
sys_chroot(td,uap)863 sys_chroot(td, uap)
864 struct thread *td;
865 struct chroot_args /* {
866 char *path;
867 } */ *uap;
868 {
869 struct nameidata nd;
870 int error;
871
872 error = priv_check(td, PRIV_VFS_CHROOT);
873 if (error != 0)
874 return (error);
875 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
876 UIO_USERSPACE, uap->path, td);
877 error = namei(&nd);
878 if (error != 0)
879 goto error;
880 error = change_dir(nd.ni_vp, td);
881 if (error != 0)
882 goto e_vunlock;
883 #ifdef MAC
884 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
885 if (error != 0)
886 goto e_vunlock;
887 #endif
888 VOP_UNLOCK(nd.ni_vp, 0);
889 error = change_root(nd.ni_vp, td);
890 vrele(nd.ni_vp);
891 NDFREE(&nd, NDF_ONLY_PNBUF);
892 return (error);
893 e_vunlock:
894 vput(nd.ni_vp);
895 error:
896 NDFREE(&nd, NDF_ONLY_PNBUF);
897 return (error);
898 }
899
900 /*
901 * Common routine for chroot and chdir. Callers must provide a locked vnode
902 * instance.
903 */
904 int
change_dir(vp,td)905 change_dir(vp, td)
906 struct vnode *vp;
907 struct thread *td;
908 {
909 #ifdef MAC
910 int error;
911 #endif
912
913 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
914 if (vp->v_type != VDIR)
915 return (ENOTDIR);
916 #ifdef MAC
917 error = mac_vnode_check_chdir(td->td_ucred, vp);
918 if (error != 0)
919 return (error);
920 #endif
921 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
922 }
923
924 /*
925 * Common routine for kern_chroot() and jail_attach(). The caller is
926 * responsible for invoking priv_check() and mac_vnode_check_chroot() to
927 * authorize this operation.
928 */
929 int
change_root(vp,td)930 change_root(vp, td)
931 struct vnode *vp;
932 struct thread *td;
933 {
934 struct filedesc *fdp;
935 struct vnode *oldvp;
936 int error;
937
938 fdp = td->td_proc->p_fd;
939 FILEDESC_XLOCK(fdp);
940 if (chroot_allow_open_directories == 0 ||
941 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
942 error = chroot_refuse_vdir_fds(fdp);
943 if (error != 0) {
944 FILEDESC_XUNLOCK(fdp);
945 return (error);
946 }
947 }
948 oldvp = fdp->fd_rdir;
949 fdp->fd_rdir = vp;
950 VREF(fdp->fd_rdir);
951 if (!fdp->fd_jdir) {
952 fdp->fd_jdir = vp;
953 VREF(fdp->fd_jdir);
954 }
955 FILEDESC_XUNLOCK(fdp);
956 vrele(oldvp);
957 return (0);
958 }
959
960 static __inline void
flags_to_rights(int flags,cap_rights_t * rightsp)961 flags_to_rights(int flags, cap_rights_t *rightsp)
962 {
963
964 if (flags & O_EXEC) {
965 cap_rights_set(rightsp, CAP_FEXECVE);
966 } else {
967 switch ((flags & O_ACCMODE)) {
968 case O_RDONLY:
969 cap_rights_set(rightsp, CAP_READ);
970 break;
971 case O_RDWR:
972 cap_rights_set(rightsp, CAP_READ);
973 /* FALLTHROUGH */
974 case O_WRONLY:
975 cap_rights_set(rightsp, CAP_WRITE);
976 if (!(flags & (O_APPEND | O_TRUNC)))
977 cap_rights_set(rightsp, CAP_SEEK);
978 break;
979 }
980 }
981
982 if (flags & O_CREAT)
983 cap_rights_set(rightsp, CAP_CREATE);
984
985 if (flags & O_TRUNC)
986 cap_rights_set(rightsp, CAP_FTRUNCATE);
987
988 if (flags & (O_SYNC | O_FSYNC))
989 cap_rights_set(rightsp, CAP_FSYNC);
990
991 if (flags & (O_EXLOCK | O_SHLOCK))
992 cap_rights_set(rightsp, CAP_FLOCK);
993 }
994
995 /*
996 * Check permissions, allocate an open file structure, and call the device
997 * open routine if any.
998 */
999 #ifndef _SYS_SYSPROTO_H_
1000 struct open_args {
1001 char *path;
1002 int flags;
1003 int mode;
1004 };
1005 #endif
1006 int
sys_open(td,uap)1007 sys_open(td, uap)
1008 struct thread *td;
1009 register struct open_args /* {
1010 char *path;
1011 int flags;
1012 int mode;
1013 } */ *uap;
1014 {
1015
1016 return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
1017 }
1018
1019 #ifndef _SYS_SYSPROTO_H_
1020 struct openat_args {
1021 int fd;
1022 char *path;
1023 int flag;
1024 int mode;
1025 };
1026 #endif
1027 int
sys_openat(struct thread * td,struct openat_args * uap)1028 sys_openat(struct thread *td, struct openat_args *uap)
1029 {
1030
1031 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1032 uap->mode));
1033 }
1034
1035 int
kern_open(struct thread * td,char * path,enum uio_seg pathseg,int flags,int mode)1036 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
1037 int mode)
1038 {
1039
1040 return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode));
1041 }
1042
1043 int
kern_openat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int flags,int mode)1044 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1045 int flags, int mode)
1046 {
1047 struct proc *p = td->td_proc;
1048 struct filedesc *fdp = p->p_fd;
1049 struct file *fp;
1050 struct vnode *vp;
1051 struct nameidata nd;
1052 cap_rights_t rights;
1053 int cmode, error, indx;
1054
1055 indx = -1;
1056
1057 AUDIT_ARG_FFLAGS(flags);
1058 AUDIT_ARG_MODE(mode);
1059 /* XXX: audit dirfd */
1060 cap_rights_init(&rights, CAP_LOOKUP);
1061 flags_to_rights(flags, &rights);
1062 /*
1063 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1064 * may be specified.
1065 */
1066 if (flags & O_EXEC) {
1067 if (flags & O_ACCMODE)
1068 return (EINVAL);
1069 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1070 return (EINVAL);
1071 } else {
1072 flags = FFLAGS(flags);
1073 }
1074
1075 /*
1076 * Allocate the file descriptor, but don't install a descriptor yet.
1077 */
1078 error = falloc_noinstall(td, &fp);
1079 if (error != 0)
1080 return (error);
1081 /*
1082 * An extra reference on `fp' has been held for us by
1083 * falloc_noinstall().
1084 */
1085 /* Set the flags early so the finit in devfs can pick them up. */
1086 fp->f_flag = flags & FMASK;
1087 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
1088 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
1089 &rights, td);
1090 td->td_dupfd = -1; /* XXX check for fdopen */
1091 error = vn_open(&nd, &flags, cmode, fp);
1092 if (error != 0) {
1093 /*
1094 * If the vn_open replaced the method vector, something
1095 * wonderous happened deep below and we just pass it up
1096 * pretending we know what we do.
1097 */
1098 if (error == ENXIO && fp->f_ops != &badfileops)
1099 goto success;
1100
1101 /*
1102 * Handle special fdopen() case. bleh.
1103 *
1104 * Don't do this for relative (capability) lookups; we don't
1105 * understand exactly what would happen, and we don't think
1106 * that it ever should.
1107 */
1108 if (nd.ni_strictrelative == 0 &&
1109 (error == ENODEV || error == ENXIO) &&
1110 td->td_dupfd >= 0) {
1111 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1112 &indx);
1113 if (error == 0)
1114 goto success;
1115 }
1116
1117 goto bad;
1118 }
1119 td->td_dupfd = 0;
1120 NDFREE(&nd, NDF_ONLY_PNBUF);
1121 vp = nd.ni_vp;
1122
1123 /*
1124 * Store the vnode, for any f_type. Typically, the vnode use
1125 * count is decremented by direct call to vn_closefile() for
1126 * files that switched type in the cdevsw fdopen() method.
1127 */
1128 fp->f_vnode = vp;
1129 /*
1130 * If the file wasn't claimed by devfs bind it to the normal
1131 * vnode operations here.
1132 */
1133 if (fp->f_ops == &badfileops) {
1134 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
1135 fp->f_seqcount = 1;
1136 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK),
1137 DTYPE_VNODE, vp, &vnops);
1138 }
1139
1140 VOP_UNLOCK(vp, 0);
1141 if (flags & O_TRUNC) {
1142 error = fo_truncate(fp, 0, td->td_ucred, td);
1143 if (error != 0)
1144 goto bad;
1145 }
1146 success:
1147 /*
1148 * If we haven't already installed the FD (for dupfdopen), do so now.
1149 */
1150 if (indx == -1) {
1151 struct filecaps *fcaps;
1152
1153 #ifdef CAPABILITIES
1154 if (nd.ni_strictrelative == 1)
1155 fcaps = &nd.ni_filecaps;
1156 else
1157 #endif
1158 fcaps = NULL;
1159 error = finstall(td, fp, &indx, flags, fcaps);
1160 /* On success finstall() consumes fcaps. */
1161 if (error != 0) {
1162 filecaps_free(&nd.ni_filecaps);
1163 goto bad;
1164 }
1165 } else {
1166 filecaps_free(&nd.ni_filecaps);
1167 }
1168
1169 /*
1170 * Release our private reference, leaving the one associated with
1171 * the descriptor table intact.
1172 */
1173 fdrop(fp, td);
1174 td->td_retval[0] = indx;
1175 return (0);
1176 bad:
1177 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1178 fdrop(fp, td);
1179 return (error);
1180 }
1181
1182 #ifdef COMPAT_43
1183 /*
1184 * Create a file.
1185 */
1186 #ifndef _SYS_SYSPROTO_H_
1187 struct ocreat_args {
1188 char *path;
1189 int mode;
1190 };
1191 #endif
1192 int
ocreat(td,uap)1193 ocreat(td, uap)
1194 struct thread *td;
1195 register struct ocreat_args /* {
1196 char *path;
1197 int mode;
1198 } */ *uap;
1199 {
1200
1201 return (kern_open(td, uap->path, UIO_USERSPACE,
1202 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1203 }
1204 #endif /* COMPAT_43 */
1205
1206 /*
1207 * Create a special file.
1208 */
1209 #ifndef _SYS_SYSPROTO_H_
1210 struct mknod_args {
1211 char *path;
1212 int mode;
1213 int dev;
1214 };
1215 #endif
1216 int
sys_mknod(td,uap)1217 sys_mknod(td, uap)
1218 struct thread *td;
1219 register struct mknod_args /* {
1220 char *path;
1221 int mode;
1222 int dev;
1223 } */ *uap;
1224 {
1225
1226 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
1227 }
1228
1229 #ifndef _SYS_SYSPROTO_H_
1230 struct mknodat_args {
1231 int fd;
1232 char *path;
1233 mode_t mode;
1234 dev_t dev;
1235 };
1236 #endif
1237 int
sys_mknodat(struct thread * td,struct mknodat_args * uap)1238 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1239 {
1240
1241 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1242 uap->dev));
1243 }
1244
1245 int
kern_mknod(struct thread * td,char * path,enum uio_seg pathseg,int mode,int dev)1246 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
1247 int dev)
1248 {
1249
1250 return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev));
1251 }
1252
1253 int
kern_mknodat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int mode,int dev)1254 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1255 int mode, int dev)
1256 {
1257 struct vnode *vp;
1258 struct mount *mp;
1259 struct vattr vattr;
1260 struct nameidata nd;
1261 cap_rights_t rights;
1262 int error, whiteout = 0;
1263
1264 AUDIT_ARG_MODE(mode);
1265 AUDIT_ARG_DEV(dev);
1266 switch (mode & S_IFMT) {
1267 case S_IFCHR:
1268 case S_IFBLK:
1269 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1270 break;
1271 case S_IFMT:
1272 error = priv_check(td, PRIV_VFS_MKNOD_BAD);
1273 break;
1274 case S_IFWHT:
1275 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1276 break;
1277 case S_IFIFO:
1278 if (dev == 0)
1279 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1280 /* FALLTHROUGH */
1281 default:
1282 error = EINVAL;
1283 break;
1284 }
1285 if (error != 0)
1286 return (error);
1287 restart:
1288 bwillwrite();
1289 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1290 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKNODAT),
1291 td);
1292 if ((error = namei(&nd)) != 0)
1293 return (error);
1294 vp = nd.ni_vp;
1295 if (vp != NULL) {
1296 NDFREE(&nd, NDF_ONLY_PNBUF);
1297 if (vp == nd.ni_dvp)
1298 vrele(nd.ni_dvp);
1299 else
1300 vput(nd.ni_dvp);
1301 vrele(vp);
1302 return (EEXIST);
1303 } else {
1304 VATTR_NULL(&vattr);
1305 vattr.va_mode = (mode & ALLPERMS) &
1306 ~td->td_proc->p_fd->fd_cmask;
1307 vattr.va_rdev = dev;
1308 whiteout = 0;
1309
1310 switch (mode & S_IFMT) {
1311 case S_IFMT: /* used by badsect to flag bad sectors */
1312 vattr.va_type = VBAD;
1313 break;
1314 case S_IFCHR:
1315 vattr.va_type = VCHR;
1316 break;
1317 case S_IFBLK:
1318 vattr.va_type = VBLK;
1319 break;
1320 case S_IFWHT:
1321 whiteout = 1;
1322 break;
1323 default:
1324 panic("kern_mknod: invalid mode");
1325 }
1326 }
1327 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1328 NDFREE(&nd, NDF_ONLY_PNBUF);
1329 vput(nd.ni_dvp);
1330 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1331 return (error);
1332 goto restart;
1333 }
1334 #ifdef MAC
1335 if (error == 0 && !whiteout)
1336 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1337 &nd.ni_cnd, &vattr);
1338 #endif
1339 if (error == 0) {
1340 if (whiteout)
1341 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1342 else {
1343 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1344 &nd.ni_cnd, &vattr);
1345 if (error == 0)
1346 vput(nd.ni_vp);
1347 }
1348 }
1349 NDFREE(&nd, NDF_ONLY_PNBUF);
1350 vput(nd.ni_dvp);
1351 vn_finished_write(mp);
1352 return (error);
1353 }
1354
1355 /*
1356 * Create a named pipe.
1357 */
1358 #ifndef _SYS_SYSPROTO_H_
1359 struct mkfifo_args {
1360 char *path;
1361 int mode;
1362 };
1363 #endif
1364 int
sys_mkfifo(td,uap)1365 sys_mkfifo(td, uap)
1366 struct thread *td;
1367 register struct mkfifo_args /* {
1368 char *path;
1369 int mode;
1370 } */ *uap;
1371 {
1372
1373 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
1374 }
1375
1376 #ifndef _SYS_SYSPROTO_H_
1377 struct mkfifoat_args {
1378 int fd;
1379 char *path;
1380 mode_t mode;
1381 };
1382 #endif
1383 int
sys_mkfifoat(struct thread * td,struct mkfifoat_args * uap)1384 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1385 {
1386
1387 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1388 uap->mode));
1389 }
1390
1391 int
kern_mkfifo(struct thread * td,char * path,enum uio_seg pathseg,int mode)1392 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
1393 {
1394
1395 return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode));
1396 }
1397
1398 int
kern_mkfifoat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int mode)1399 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1400 int mode)
1401 {
1402 struct mount *mp;
1403 struct vattr vattr;
1404 struct nameidata nd;
1405 cap_rights_t rights;
1406 int error;
1407
1408 AUDIT_ARG_MODE(mode);
1409 restart:
1410 bwillwrite();
1411 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1412 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKFIFOAT),
1413 td);
1414 if ((error = namei(&nd)) != 0)
1415 return (error);
1416 if (nd.ni_vp != NULL) {
1417 NDFREE(&nd, NDF_ONLY_PNBUF);
1418 if (nd.ni_vp == nd.ni_dvp)
1419 vrele(nd.ni_dvp);
1420 else
1421 vput(nd.ni_dvp);
1422 vrele(nd.ni_vp);
1423 return (EEXIST);
1424 }
1425 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1426 NDFREE(&nd, NDF_ONLY_PNBUF);
1427 vput(nd.ni_dvp);
1428 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1429 return (error);
1430 goto restart;
1431 }
1432 VATTR_NULL(&vattr);
1433 vattr.va_type = VFIFO;
1434 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1435 #ifdef MAC
1436 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1437 &vattr);
1438 if (error != 0)
1439 goto out;
1440 #endif
1441 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1442 if (error == 0)
1443 vput(nd.ni_vp);
1444 #ifdef MAC
1445 out:
1446 #endif
1447 vput(nd.ni_dvp);
1448 vn_finished_write(mp);
1449 NDFREE(&nd, NDF_ONLY_PNBUF);
1450 return (error);
1451 }
1452
1453 /*
1454 * Make a hard file link.
1455 */
1456 #ifndef _SYS_SYSPROTO_H_
1457 struct link_args {
1458 char *path;
1459 char *link;
1460 };
1461 #endif
1462 int
sys_link(td,uap)1463 sys_link(td, uap)
1464 struct thread *td;
1465 register struct link_args /* {
1466 char *path;
1467 char *link;
1468 } */ *uap;
1469 {
1470
1471 return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
1472 }
1473
1474 #ifndef _SYS_SYSPROTO_H_
1475 struct linkat_args {
1476 int fd1;
1477 char *path1;
1478 int fd2;
1479 char *path2;
1480 int flag;
1481 };
1482 #endif
1483 int
sys_linkat(struct thread * td,struct linkat_args * uap)1484 sys_linkat(struct thread *td, struct linkat_args *uap)
1485 {
1486 int flag;
1487
1488 flag = uap->flag;
1489 if (flag & ~AT_SYMLINK_FOLLOW)
1490 return (EINVAL);
1491
1492 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1493 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1494 }
1495
1496 int hardlink_check_uid = 0;
1497 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1498 &hardlink_check_uid, 0,
1499 "Unprivileged processes cannot create hard links to files owned by other "
1500 "users");
1501 static int hardlink_check_gid = 0;
1502 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1503 &hardlink_check_gid, 0,
1504 "Unprivileged processes cannot create hard links to files owned by other "
1505 "groups");
1506
1507 static int
can_hardlink(struct vnode * vp,struct ucred * cred)1508 can_hardlink(struct vnode *vp, struct ucred *cred)
1509 {
1510 struct vattr va;
1511 int error;
1512
1513 if (!hardlink_check_uid && !hardlink_check_gid)
1514 return (0);
1515
1516 error = VOP_GETATTR(vp, &va, cred);
1517 if (error != 0)
1518 return (error);
1519
1520 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1521 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1522 if (error != 0)
1523 return (error);
1524 }
1525
1526 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1527 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1528 if (error != 0)
1529 return (error);
1530 }
1531
1532 return (0);
1533 }
1534
1535 int
kern_link(struct thread * td,char * path,char * link,enum uio_seg segflg)1536 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
1537 {
1538
1539 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW));
1540 }
1541
1542 int
kern_linkat(struct thread * td,int fd1,int fd2,char * path1,char * path2,enum uio_seg segflg,int follow)1543 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1544 enum uio_seg segflg, int follow)
1545 {
1546 struct vnode *vp;
1547 struct mount *mp;
1548 struct nameidata nd;
1549 cap_rights_t rights;
1550 int error;
1551
1552 again:
1553 bwillwrite();
1554 NDINIT_AT(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1, td);
1555
1556 if ((error = namei(&nd)) != 0)
1557 return (error);
1558 NDFREE(&nd, NDF_ONLY_PNBUF);
1559 vp = nd.ni_vp;
1560 if (vp->v_type == VDIR) {
1561 vrele(vp);
1562 return (EPERM); /* POSIX */
1563 }
1564 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE2 |
1565 NOCACHE, segflg, path2, fd2, cap_rights_init(&rights, CAP_LINKAT),
1566 td);
1567 if ((error = namei(&nd)) == 0) {
1568 if (nd.ni_vp != NULL) {
1569 NDFREE(&nd, NDF_ONLY_PNBUF);
1570 if (nd.ni_dvp == nd.ni_vp)
1571 vrele(nd.ni_dvp);
1572 else
1573 vput(nd.ni_dvp);
1574 vrele(nd.ni_vp);
1575 vrele(vp);
1576 return (EEXIST);
1577 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1578 /*
1579 * Cross-device link. No need to recheck
1580 * vp->v_type, since it cannot change, except
1581 * to VBAD.
1582 */
1583 NDFREE(&nd, NDF_ONLY_PNBUF);
1584 vput(nd.ni_dvp);
1585 vrele(vp);
1586 return (EXDEV);
1587 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
1588 error = can_hardlink(vp, td->td_ucred);
1589 #ifdef MAC
1590 if (error == 0)
1591 error = mac_vnode_check_link(td->td_ucred,
1592 nd.ni_dvp, vp, &nd.ni_cnd);
1593 #endif
1594 if (error != 0) {
1595 vput(vp);
1596 vput(nd.ni_dvp);
1597 NDFREE(&nd, NDF_ONLY_PNBUF);
1598 return (error);
1599 }
1600 error = vn_start_write(vp, &mp, V_NOWAIT);
1601 if (error != 0) {
1602 vput(vp);
1603 vput(nd.ni_dvp);
1604 NDFREE(&nd, NDF_ONLY_PNBUF);
1605 error = vn_start_write(NULL, &mp,
1606 V_XSLEEP | PCATCH);
1607 if (error != 0)
1608 return (error);
1609 goto again;
1610 }
1611 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1612 VOP_UNLOCK(vp, 0);
1613 vput(nd.ni_dvp);
1614 vn_finished_write(mp);
1615 NDFREE(&nd, NDF_ONLY_PNBUF);
1616 } else {
1617 vput(nd.ni_dvp);
1618 NDFREE(&nd, NDF_ONLY_PNBUF);
1619 vrele(vp);
1620 goto again;
1621 }
1622 }
1623 vrele(vp);
1624 return (error);
1625 }
1626
1627 /*
1628 * Make a symbolic link.
1629 */
1630 #ifndef _SYS_SYSPROTO_H_
1631 struct symlink_args {
1632 char *path;
1633 char *link;
1634 };
1635 #endif
1636 int
sys_symlink(td,uap)1637 sys_symlink(td, uap)
1638 struct thread *td;
1639 register struct symlink_args /* {
1640 char *path;
1641 char *link;
1642 } */ *uap;
1643 {
1644
1645 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
1646 }
1647
1648 #ifndef _SYS_SYSPROTO_H_
1649 struct symlinkat_args {
1650 char *path;
1651 int fd;
1652 char *path2;
1653 };
1654 #endif
1655 int
sys_symlinkat(struct thread * td,struct symlinkat_args * uap)1656 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1657 {
1658
1659 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1660 UIO_USERSPACE));
1661 }
1662
1663 int
kern_symlink(struct thread * td,char * path,char * link,enum uio_seg segflg)1664 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
1665 {
1666
1667 return (kern_symlinkat(td, path, AT_FDCWD, link, segflg));
1668 }
1669
1670 int
kern_symlinkat(struct thread * td,char * path1,int fd,char * path2,enum uio_seg segflg)1671 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1672 enum uio_seg segflg)
1673 {
1674 struct mount *mp;
1675 struct vattr vattr;
1676 char *syspath;
1677 struct nameidata nd;
1678 int error;
1679 cap_rights_t rights;
1680
1681 if (segflg == UIO_SYSSPACE) {
1682 syspath = path1;
1683 } else {
1684 syspath = uma_zalloc(namei_zone, M_WAITOK);
1685 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1686 goto out;
1687 }
1688 AUDIT_ARG_TEXT(syspath);
1689 restart:
1690 bwillwrite();
1691 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1692 NOCACHE, segflg, path2, fd, cap_rights_init(&rights, CAP_SYMLINKAT),
1693 td);
1694 if ((error = namei(&nd)) != 0)
1695 goto out;
1696 if (nd.ni_vp) {
1697 NDFREE(&nd, NDF_ONLY_PNBUF);
1698 if (nd.ni_vp == nd.ni_dvp)
1699 vrele(nd.ni_dvp);
1700 else
1701 vput(nd.ni_dvp);
1702 vrele(nd.ni_vp);
1703 error = EEXIST;
1704 goto out;
1705 }
1706 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1707 NDFREE(&nd, NDF_ONLY_PNBUF);
1708 vput(nd.ni_dvp);
1709 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1710 goto out;
1711 goto restart;
1712 }
1713 VATTR_NULL(&vattr);
1714 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1715 #ifdef MAC
1716 vattr.va_type = VLNK;
1717 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1718 &vattr);
1719 if (error != 0)
1720 goto out2;
1721 #endif
1722 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1723 if (error == 0)
1724 vput(nd.ni_vp);
1725 #ifdef MAC
1726 out2:
1727 #endif
1728 NDFREE(&nd, NDF_ONLY_PNBUF);
1729 vput(nd.ni_dvp);
1730 vn_finished_write(mp);
1731 out:
1732 if (segflg != UIO_SYSSPACE)
1733 uma_zfree(namei_zone, syspath);
1734 return (error);
1735 }
1736
1737 /*
1738 * Delete a whiteout from the filesystem.
1739 */
1740 int
sys_undelete(td,uap)1741 sys_undelete(td, uap)
1742 struct thread *td;
1743 register struct undelete_args /* {
1744 char *path;
1745 } */ *uap;
1746 {
1747 struct mount *mp;
1748 struct nameidata nd;
1749 int error;
1750
1751 restart:
1752 bwillwrite();
1753 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1754 UIO_USERSPACE, uap->path, td);
1755 error = namei(&nd);
1756 if (error != 0)
1757 return (error);
1758
1759 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1760 NDFREE(&nd, NDF_ONLY_PNBUF);
1761 if (nd.ni_vp == nd.ni_dvp)
1762 vrele(nd.ni_dvp);
1763 else
1764 vput(nd.ni_dvp);
1765 if (nd.ni_vp)
1766 vrele(nd.ni_vp);
1767 return (EEXIST);
1768 }
1769 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1770 NDFREE(&nd, NDF_ONLY_PNBUF);
1771 vput(nd.ni_dvp);
1772 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1773 return (error);
1774 goto restart;
1775 }
1776 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1777 NDFREE(&nd, NDF_ONLY_PNBUF);
1778 vput(nd.ni_dvp);
1779 vn_finished_write(mp);
1780 return (error);
1781 }
1782
1783 /*
1784 * Delete a name from the filesystem.
1785 */
1786 #ifndef _SYS_SYSPROTO_H_
1787 struct unlink_args {
1788 char *path;
1789 };
1790 #endif
1791 int
sys_unlink(td,uap)1792 sys_unlink(td, uap)
1793 struct thread *td;
1794 struct unlink_args /* {
1795 char *path;
1796 } */ *uap;
1797 {
1798
1799 return (kern_unlink(td, uap->path, UIO_USERSPACE));
1800 }
1801
1802 #ifndef _SYS_SYSPROTO_H_
1803 struct unlinkat_args {
1804 int fd;
1805 char *path;
1806 int flag;
1807 };
1808 #endif
1809 int
sys_unlinkat(struct thread * td,struct unlinkat_args * uap)1810 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1811 {
1812 int flag = uap->flag;
1813 int fd = uap->fd;
1814 char *path = uap->path;
1815
1816 if (flag & ~AT_REMOVEDIR)
1817 return (EINVAL);
1818
1819 if (flag & AT_REMOVEDIR)
1820 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1821 else
1822 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0));
1823 }
1824
1825 int
kern_unlink(struct thread * td,char * path,enum uio_seg pathseg)1826 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
1827 {
1828
1829 return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0));
1830 }
1831
1832 int
kern_unlinkat(struct thread * td,int fd,char * path,enum uio_seg pathseg,ino_t oldinum)1833 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1834 ino_t oldinum)
1835 {
1836 struct mount *mp;
1837 struct vnode *vp;
1838 struct nameidata nd;
1839 struct stat sb;
1840 cap_rights_t rights;
1841 int error;
1842
1843 restart:
1844 bwillwrite();
1845 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
1846 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
1847 if ((error = namei(&nd)) != 0)
1848 return (error == EINVAL ? EPERM : error);
1849 vp = nd.ni_vp;
1850 if (vp->v_type == VDIR && oldinum == 0) {
1851 error = EPERM; /* POSIX */
1852 } else if (oldinum != 0 &&
1853 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1854 sb.st_ino != oldinum) {
1855 error = EIDRM; /* Identifier removed */
1856 } else {
1857 /*
1858 * The root of a mounted filesystem cannot be deleted.
1859 *
1860 * XXX: can this only be a VDIR case?
1861 */
1862 if (vp->v_vflag & VV_ROOT)
1863 error = EBUSY;
1864 }
1865 if (error == 0) {
1866 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1867 NDFREE(&nd, NDF_ONLY_PNBUF);
1868 vput(nd.ni_dvp);
1869 if (vp == nd.ni_dvp)
1870 vrele(vp);
1871 else
1872 vput(vp);
1873 if ((error = vn_start_write(NULL, &mp,
1874 V_XSLEEP | PCATCH)) != 0)
1875 return (error);
1876 goto restart;
1877 }
1878 #ifdef MAC
1879 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1880 &nd.ni_cnd);
1881 if (error != 0)
1882 goto out;
1883 #endif
1884 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1885 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1886 #ifdef MAC
1887 out:
1888 #endif
1889 vn_finished_write(mp);
1890 }
1891 NDFREE(&nd, NDF_ONLY_PNBUF);
1892 vput(nd.ni_dvp);
1893 if (vp == nd.ni_dvp)
1894 vrele(vp);
1895 else
1896 vput(vp);
1897 return (error);
1898 }
1899
1900 /*
1901 * Reposition read/write file offset.
1902 */
1903 #ifndef _SYS_SYSPROTO_H_
1904 struct lseek_args {
1905 int fd;
1906 int pad;
1907 off_t offset;
1908 int whence;
1909 };
1910 #endif
1911 int
sys_lseek(td,uap)1912 sys_lseek(td, uap)
1913 struct thread *td;
1914 register struct lseek_args /* {
1915 int fd;
1916 int pad;
1917 off_t offset;
1918 int whence;
1919 } */ *uap;
1920 {
1921 struct file *fp;
1922 cap_rights_t rights;
1923 int error;
1924
1925 AUDIT_ARG_FD(uap->fd);
1926 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_SEEK), &fp);
1927 if (error != 0)
1928 return (error);
1929 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
1930 fo_seek(fp, uap->offset, uap->whence, td) : ESPIPE;
1931 fdrop(fp, td);
1932 return (error);
1933 }
1934
1935 #if defined(COMPAT_43)
1936 /*
1937 * Reposition read/write file offset.
1938 */
1939 #ifndef _SYS_SYSPROTO_H_
1940 struct olseek_args {
1941 int fd;
1942 long offset;
1943 int whence;
1944 };
1945 #endif
1946 int
olseek(td,uap)1947 olseek(td, uap)
1948 struct thread *td;
1949 register struct olseek_args /* {
1950 int fd;
1951 long offset;
1952 int whence;
1953 } */ *uap;
1954 {
1955 struct lseek_args /* {
1956 int fd;
1957 int pad;
1958 off_t offset;
1959 int whence;
1960 } */ nuap;
1961
1962 nuap.fd = uap->fd;
1963 nuap.offset = uap->offset;
1964 nuap.whence = uap->whence;
1965 return (sys_lseek(td, &nuap));
1966 }
1967 #endif /* COMPAT_43 */
1968
1969 /* Version with the 'pad' argument */
1970 int
freebsd6_lseek(td,uap)1971 freebsd6_lseek(td, uap)
1972 struct thread *td;
1973 register struct freebsd6_lseek_args *uap;
1974 {
1975 struct lseek_args ouap;
1976
1977 ouap.fd = uap->fd;
1978 ouap.offset = uap->offset;
1979 ouap.whence = uap->whence;
1980 return (sys_lseek(td, &ouap));
1981 }
1982
1983 /*
1984 * Check access permissions using passed credentials.
1985 */
1986 static int
vn_access(vp,user_flags,cred,td)1987 vn_access(vp, user_flags, cred, td)
1988 struct vnode *vp;
1989 int user_flags;
1990 struct ucred *cred;
1991 struct thread *td;
1992 {
1993 accmode_t accmode;
1994 int error;
1995
1996 /* Flags == 0 means only check for existence. */
1997 error = 0;
1998 if (user_flags) {
1999 accmode = 0;
2000 if (user_flags & R_OK)
2001 accmode |= VREAD;
2002 if (user_flags & W_OK)
2003 accmode |= VWRITE;
2004 if (user_flags & X_OK)
2005 accmode |= VEXEC;
2006 #ifdef MAC
2007 error = mac_vnode_check_access(cred, vp, accmode);
2008 if (error != 0)
2009 return (error);
2010 #endif
2011 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
2012 error = VOP_ACCESS(vp, accmode, cred, td);
2013 }
2014 return (error);
2015 }
2016
2017 /*
2018 * Check access permissions using "real" credentials.
2019 */
2020 #ifndef _SYS_SYSPROTO_H_
2021 struct access_args {
2022 char *path;
2023 int amode;
2024 };
2025 #endif
2026 int
sys_access(td,uap)2027 sys_access(td, uap)
2028 struct thread *td;
2029 register struct access_args /* {
2030 char *path;
2031 int amode;
2032 } */ *uap;
2033 {
2034
2035 return (kern_access(td, uap->path, UIO_USERSPACE, uap->amode));
2036 }
2037
2038 #ifndef _SYS_SYSPROTO_H_
2039 struct faccessat_args {
2040 int dirfd;
2041 char *path;
2042 int amode;
2043 int flag;
2044 }
2045 #endif
2046 int
sys_faccessat(struct thread * td,struct faccessat_args * uap)2047 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2048 {
2049
2050 if (uap->flag & ~AT_EACCESS)
2051 return (EINVAL);
2052 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2053 uap->amode));
2054 }
2055
2056 int
kern_access(struct thread * td,char * path,enum uio_seg pathseg,int amode)2057 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int amode)
2058 {
2059
2060 return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, amode));
2061 }
2062
2063 int
kern_accessat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int flag,int amode)2064 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2065 int flag, int amode)
2066 {
2067 struct ucred *cred, *tmpcred;
2068 struct vnode *vp;
2069 struct nameidata nd;
2070 cap_rights_t rights;
2071 int error;
2072
2073 /*
2074 * Create and modify a temporary credential instead of one that
2075 * is potentially shared.
2076 */
2077 if (!(flag & AT_EACCESS)) {
2078 cred = td->td_ucred;
2079 tmpcred = crdup(cred);
2080 tmpcred->cr_uid = cred->cr_ruid;
2081 tmpcred->cr_groups[0] = cred->cr_rgid;
2082 td->td_ucred = tmpcred;
2083 } else
2084 cred = tmpcred = td->td_ucred;
2085 AUDIT_ARG_VALUE(amode);
2086 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
2087 AUDITVNODE1, pathseg, path, fd, cap_rights_init(&rights, CAP_FSTAT),
2088 td);
2089 if ((error = namei(&nd)) != 0)
2090 goto out1;
2091 vp = nd.ni_vp;
2092
2093 error = vn_access(vp, amode, tmpcred, td);
2094 NDFREE(&nd, NDF_ONLY_PNBUF);
2095 vput(vp);
2096 out1:
2097 if (!(flag & AT_EACCESS)) {
2098 td->td_ucred = cred;
2099 crfree(tmpcred);
2100 }
2101 return (error);
2102 }
2103
2104 /*
2105 * Check access permissions using "effective" credentials.
2106 */
2107 #ifndef _SYS_SYSPROTO_H_
2108 struct eaccess_args {
2109 char *path;
2110 int amode;
2111 };
2112 #endif
2113 int
sys_eaccess(td,uap)2114 sys_eaccess(td, uap)
2115 struct thread *td;
2116 register struct eaccess_args /* {
2117 char *path;
2118 int amode;
2119 } */ *uap;
2120 {
2121
2122 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->amode));
2123 }
2124
2125 int
kern_eaccess(struct thread * td,char * path,enum uio_seg pathseg,int amode)2126 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int amode)
2127 {
2128
2129 return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, amode));
2130 }
2131
2132 #if defined(COMPAT_43)
2133 /*
2134 * Get file status; this version follows links.
2135 */
2136 #ifndef _SYS_SYSPROTO_H_
2137 struct ostat_args {
2138 char *path;
2139 struct ostat *ub;
2140 };
2141 #endif
2142 int
ostat(td,uap)2143 ostat(td, uap)
2144 struct thread *td;
2145 register struct ostat_args /* {
2146 char *path;
2147 struct ostat *ub;
2148 } */ *uap;
2149 {
2150 struct stat sb;
2151 struct ostat osb;
2152 int error;
2153
2154 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2155 if (error != 0)
2156 return (error);
2157 cvtstat(&sb, &osb);
2158 return (copyout(&osb, uap->ub, sizeof (osb)));
2159 }
2160
2161 /*
2162 * Get file status; this version does not follow links.
2163 */
2164 #ifndef _SYS_SYSPROTO_H_
2165 struct olstat_args {
2166 char *path;
2167 struct ostat *ub;
2168 };
2169 #endif
2170 int
olstat(td,uap)2171 olstat(td, uap)
2172 struct thread *td;
2173 register struct olstat_args /* {
2174 char *path;
2175 struct ostat *ub;
2176 } */ *uap;
2177 {
2178 struct stat sb;
2179 struct ostat osb;
2180 int error;
2181
2182 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2183 if (error != 0)
2184 return (error);
2185 cvtstat(&sb, &osb);
2186 return (copyout(&osb, uap->ub, sizeof (osb)));
2187 }
2188
2189 /*
2190 * Convert from an old to a new stat structure.
2191 */
2192 void
cvtstat(st,ost)2193 cvtstat(st, ost)
2194 struct stat *st;
2195 struct ostat *ost;
2196 {
2197
2198 ost->st_dev = st->st_dev;
2199 ost->st_ino = st->st_ino;
2200 ost->st_mode = st->st_mode;
2201 ost->st_nlink = st->st_nlink;
2202 ost->st_uid = st->st_uid;
2203 ost->st_gid = st->st_gid;
2204 ost->st_rdev = st->st_rdev;
2205 if (st->st_size < (quad_t)1 << 32)
2206 ost->st_size = st->st_size;
2207 else
2208 ost->st_size = -2;
2209 ost->st_atim = st->st_atim;
2210 ost->st_mtim = st->st_mtim;
2211 ost->st_ctim = st->st_ctim;
2212 ost->st_blksize = st->st_blksize;
2213 ost->st_blocks = st->st_blocks;
2214 ost->st_flags = st->st_flags;
2215 ost->st_gen = st->st_gen;
2216 }
2217 #endif /* COMPAT_43 */
2218
2219 /*
2220 * Get file status; this version follows links.
2221 */
2222 #ifndef _SYS_SYSPROTO_H_
2223 struct stat_args {
2224 char *path;
2225 struct stat *ub;
2226 };
2227 #endif
2228 int
sys_stat(td,uap)2229 sys_stat(td, uap)
2230 struct thread *td;
2231 register struct stat_args /* {
2232 char *path;
2233 struct stat *ub;
2234 } */ *uap;
2235 {
2236 struct stat sb;
2237 int error;
2238
2239 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2240 if (error == 0)
2241 error = copyout(&sb, uap->ub, sizeof (sb));
2242 return (error);
2243 }
2244
2245 #ifndef _SYS_SYSPROTO_H_
2246 struct fstatat_args {
2247 int fd;
2248 char *path;
2249 struct stat *buf;
2250 int flag;
2251 }
2252 #endif
2253 int
sys_fstatat(struct thread * td,struct fstatat_args * uap)2254 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2255 {
2256 struct stat sb;
2257 int error;
2258
2259 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2260 UIO_USERSPACE, &sb);
2261 if (error == 0)
2262 error = copyout(&sb, uap->buf, sizeof (sb));
2263 return (error);
2264 }
2265
2266 int
kern_stat(struct thread * td,char * path,enum uio_seg pathseg,struct stat * sbp)2267 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2268 {
2269
2270 return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
2271 }
2272
2273 int
kern_statat(struct thread * td,int flag,int fd,char * path,enum uio_seg pathseg,struct stat * sbp)2274 kern_statat(struct thread *td, int flag, int fd, char *path,
2275 enum uio_seg pathseg, struct stat *sbp)
2276 {
2277
2278 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL));
2279 }
2280
2281 int
kern_statat_vnhook(struct thread * td,int flag,int fd,char * path,enum uio_seg pathseg,struct stat * sbp,void (* hook)(struct vnode * vp,struct stat * sbp))2282 kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
2283 enum uio_seg pathseg, struct stat *sbp,
2284 void (*hook)(struct vnode *vp, struct stat *sbp))
2285 {
2286 struct nameidata nd;
2287 struct stat sb;
2288 cap_rights_t rights;
2289 int error;
2290
2291 if (flag & ~AT_SYMLINK_NOFOLLOW)
2292 return (EINVAL);
2293
2294 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2295 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd,
2296 cap_rights_init(&rights, CAP_FSTAT), td);
2297
2298 if ((error = namei(&nd)) != 0)
2299 return (error);
2300 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2301 if (error == 0) {
2302 SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0);
2303 if (S_ISREG(sb.st_mode))
2304 SDT_PROBE(vfs, , stat, reg, path, pathseg, 0, 0, 0);
2305 if (__predict_false(hook != NULL))
2306 hook(nd.ni_vp, &sb);
2307 }
2308 NDFREE(&nd, NDF_ONLY_PNBUF);
2309 vput(nd.ni_vp);
2310 if (error != 0)
2311 return (error);
2312 *sbp = sb;
2313 #ifdef KTRACE
2314 if (KTRPOINT(td, KTR_STRUCT))
2315 ktrstat(&sb);
2316 #endif
2317 return (0);
2318 }
2319
2320 /*
2321 * Get file status; this version does not follow links.
2322 */
2323 #ifndef _SYS_SYSPROTO_H_
2324 struct lstat_args {
2325 char *path;
2326 struct stat *ub;
2327 };
2328 #endif
2329 int
sys_lstat(td,uap)2330 sys_lstat(td, uap)
2331 struct thread *td;
2332 register struct lstat_args /* {
2333 char *path;
2334 struct stat *ub;
2335 } */ *uap;
2336 {
2337 struct stat sb;
2338 int error;
2339
2340 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2341 if (error == 0)
2342 error = copyout(&sb, uap->ub, sizeof (sb));
2343 return (error);
2344 }
2345
2346 int
kern_lstat(struct thread * td,char * path,enum uio_seg pathseg,struct stat * sbp)2347 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2348 {
2349
2350 return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg,
2351 sbp));
2352 }
2353
2354 /*
2355 * Implementation of the NetBSD [l]stat() functions.
2356 */
2357 void
cvtnstat(sb,nsb)2358 cvtnstat(sb, nsb)
2359 struct stat *sb;
2360 struct nstat *nsb;
2361 {
2362
2363 bzero(nsb, sizeof *nsb);
2364 nsb->st_dev = sb->st_dev;
2365 nsb->st_ino = sb->st_ino;
2366 nsb->st_mode = sb->st_mode;
2367 nsb->st_nlink = sb->st_nlink;
2368 nsb->st_uid = sb->st_uid;
2369 nsb->st_gid = sb->st_gid;
2370 nsb->st_rdev = sb->st_rdev;
2371 nsb->st_atim = sb->st_atim;
2372 nsb->st_mtim = sb->st_mtim;
2373 nsb->st_ctim = sb->st_ctim;
2374 nsb->st_size = sb->st_size;
2375 nsb->st_blocks = sb->st_blocks;
2376 nsb->st_blksize = sb->st_blksize;
2377 nsb->st_flags = sb->st_flags;
2378 nsb->st_gen = sb->st_gen;
2379 nsb->st_birthtim = sb->st_birthtim;
2380 }
2381
2382 #ifndef _SYS_SYSPROTO_H_
2383 struct nstat_args {
2384 char *path;
2385 struct nstat *ub;
2386 };
2387 #endif
2388 int
sys_nstat(td,uap)2389 sys_nstat(td, uap)
2390 struct thread *td;
2391 register struct nstat_args /* {
2392 char *path;
2393 struct nstat *ub;
2394 } */ *uap;
2395 {
2396 struct stat sb;
2397 struct nstat nsb;
2398 int error;
2399
2400 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2401 if (error != 0)
2402 return (error);
2403 cvtnstat(&sb, &nsb);
2404 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2405 }
2406
2407 /*
2408 * NetBSD lstat. Get file status; this version does not follow links.
2409 */
2410 #ifndef _SYS_SYSPROTO_H_
2411 struct lstat_args {
2412 char *path;
2413 struct stat *ub;
2414 };
2415 #endif
2416 int
sys_nlstat(td,uap)2417 sys_nlstat(td, uap)
2418 struct thread *td;
2419 register struct nlstat_args /* {
2420 char *path;
2421 struct nstat *ub;
2422 } */ *uap;
2423 {
2424 struct stat sb;
2425 struct nstat nsb;
2426 int error;
2427
2428 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2429 if (error != 0)
2430 return (error);
2431 cvtnstat(&sb, &nsb);
2432 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2433 }
2434
2435 /*
2436 * Get configurable pathname variables.
2437 */
2438 #ifndef _SYS_SYSPROTO_H_
2439 struct pathconf_args {
2440 char *path;
2441 int name;
2442 };
2443 #endif
2444 int
sys_pathconf(td,uap)2445 sys_pathconf(td, uap)
2446 struct thread *td;
2447 register struct pathconf_args /* {
2448 char *path;
2449 int name;
2450 } */ *uap;
2451 {
2452
2453 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW));
2454 }
2455
2456 #ifndef _SYS_SYSPROTO_H_
2457 struct lpathconf_args {
2458 char *path;
2459 int name;
2460 };
2461 #endif
2462 int
sys_lpathconf(td,uap)2463 sys_lpathconf(td, uap)
2464 struct thread *td;
2465 register struct lpathconf_args /* {
2466 char *path;
2467 int name;
2468 } */ *uap;
2469 {
2470
2471 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2472 NOFOLLOW));
2473 }
2474
2475 int
kern_pathconf(struct thread * td,char * path,enum uio_seg pathseg,int name,u_long flags)2476 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2477 u_long flags)
2478 {
2479 struct nameidata nd;
2480 int error;
2481
2482 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2483 pathseg, path, td);
2484 if ((error = namei(&nd)) != 0)
2485 return (error);
2486 NDFREE(&nd, NDF_ONLY_PNBUF);
2487
2488 /* If asynchronous I/O is available, it works for all files. */
2489 if (name == _PC_ASYNC_IO)
2490 td->td_retval[0] = async_io_version;
2491 else
2492 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
2493 vput(nd.ni_vp);
2494 return (error);
2495 }
2496
2497 /*
2498 * Return target name of a symbolic link.
2499 */
2500 #ifndef _SYS_SYSPROTO_H_
2501 struct readlink_args {
2502 char *path;
2503 char *buf;
2504 size_t count;
2505 };
2506 #endif
2507 int
sys_readlink(td,uap)2508 sys_readlink(td, uap)
2509 struct thread *td;
2510 register struct readlink_args /* {
2511 char *path;
2512 char *buf;
2513 size_t count;
2514 } */ *uap;
2515 {
2516
2517 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
2518 UIO_USERSPACE, uap->count));
2519 }
2520 #ifndef _SYS_SYSPROTO_H_
2521 struct readlinkat_args {
2522 int fd;
2523 char *path;
2524 char *buf;
2525 size_t bufsize;
2526 };
2527 #endif
2528 int
sys_readlinkat(struct thread * td,struct readlinkat_args * uap)2529 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2530 {
2531
2532 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2533 uap->buf, UIO_USERSPACE, uap->bufsize));
2534 }
2535
2536 int
kern_readlink(struct thread * td,char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2537 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
2538 enum uio_seg bufseg, size_t count)
2539 {
2540
2541 return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg,
2542 count));
2543 }
2544
2545 int
kern_readlinkat(struct thread * td,int fd,char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2546 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2547 char *buf, enum uio_seg bufseg, size_t count)
2548 {
2549 struct vnode *vp;
2550 struct iovec aiov;
2551 struct uio auio;
2552 struct nameidata nd;
2553 int error;
2554
2555 if (count > IOSIZE_MAX)
2556 return (EINVAL);
2557
2558 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
2559 pathseg, path, fd, td);
2560
2561 if ((error = namei(&nd)) != 0)
2562 return (error);
2563 NDFREE(&nd, NDF_ONLY_PNBUF);
2564 vp = nd.ni_vp;
2565 #ifdef MAC
2566 error = mac_vnode_check_readlink(td->td_ucred, vp);
2567 if (error != 0) {
2568 vput(vp);
2569 return (error);
2570 }
2571 #endif
2572 if (vp->v_type != VLNK)
2573 error = EINVAL;
2574 else {
2575 aiov.iov_base = buf;
2576 aiov.iov_len = count;
2577 auio.uio_iov = &aiov;
2578 auio.uio_iovcnt = 1;
2579 auio.uio_offset = 0;
2580 auio.uio_rw = UIO_READ;
2581 auio.uio_segflg = bufseg;
2582 auio.uio_td = td;
2583 auio.uio_resid = count;
2584 error = VOP_READLINK(vp, &auio, td->td_ucred);
2585 td->td_retval[0] = count - auio.uio_resid;
2586 }
2587 vput(vp);
2588 return (error);
2589 }
2590
2591 /*
2592 * Common implementation code for chflags() and fchflags().
2593 */
2594 static int
setfflags(td,vp,flags)2595 setfflags(td, vp, flags)
2596 struct thread *td;
2597 struct vnode *vp;
2598 u_long flags;
2599 {
2600 struct mount *mp;
2601 struct vattr vattr;
2602 int error;
2603
2604 /* We can't support the value matching VNOVAL. */
2605 if (flags == VNOVAL)
2606 return (EOPNOTSUPP);
2607
2608 /*
2609 * Prevent non-root users from setting flags on devices. When
2610 * a device is reused, users can retain ownership of the device
2611 * if they are allowed to set flags and programs assume that
2612 * chown can't fail when done as root.
2613 */
2614 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2615 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2616 if (error != 0)
2617 return (error);
2618 }
2619
2620 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2621 return (error);
2622 VATTR_NULL(&vattr);
2623 vattr.va_flags = flags;
2624 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2625 #ifdef MAC
2626 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2627 if (error == 0)
2628 #endif
2629 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2630 VOP_UNLOCK(vp, 0);
2631 vn_finished_write(mp);
2632 return (error);
2633 }
2634
2635 /*
2636 * Change flags of a file given a path name.
2637 */
2638 #ifndef _SYS_SYSPROTO_H_
2639 struct chflags_args {
2640 const char *path;
2641 u_long flags;
2642 };
2643 #endif
2644 int
sys_chflags(td,uap)2645 sys_chflags(td, uap)
2646 struct thread *td;
2647 register struct chflags_args /* {
2648 const char *path;
2649 u_long flags;
2650 } */ *uap;
2651 {
2652
2653 return (kern_chflags(td, uap->path, UIO_USERSPACE, uap->flags));
2654 }
2655
2656 #ifndef _SYS_SYSPROTO_H_
2657 struct chflagsat_args {
2658 int fd;
2659 const char *path;
2660 u_long flags;
2661 int atflag;
2662 }
2663 #endif
2664 int
sys_chflagsat(struct thread * td,struct chflagsat_args * uap)2665 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2666 {
2667 int fd = uap->fd;
2668 const char *path = uap->path;
2669 u_long flags = uap->flags;
2670 int atflag = uap->atflag;
2671
2672 if (atflag & ~AT_SYMLINK_NOFOLLOW)
2673 return (EINVAL);
2674
2675 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag));
2676 }
2677
2678 static int
kern_chflags(struct thread * td,const char * path,enum uio_seg pathseg,u_long flags)2679 kern_chflags(struct thread *td, const char *path, enum uio_seg pathseg,
2680 u_long flags)
2681 {
2682
2683 return (kern_chflagsat(td, AT_FDCWD, path, pathseg, flags, 0));
2684 }
2685
2686 /*
2687 * Same as chflags() but doesn't follow symlinks.
2688 */
2689 int
sys_lchflags(td,uap)2690 sys_lchflags(td, uap)
2691 struct thread *td;
2692 register struct lchflags_args /* {
2693 const char *path;
2694 u_long flags;
2695 } */ *uap;
2696 {
2697
2698 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2699 uap->flags, AT_SYMLINK_NOFOLLOW));
2700 }
2701
2702 static int
kern_chflagsat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,u_long flags,int atflag)2703 kern_chflagsat(struct thread *td, int fd, const char *path,
2704 enum uio_seg pathseg, u_long flags, int atflag)
2705 {
2706 struct nameidata nd;
2707 cap_rights_t rights;
2708 int error, follow;
2709
2710 AUDIT_ARG_FFLAGS(flags);
2711 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2712 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2713 cap_rights_init(&rights, CAP_FCHFLAGS), td);
2714 if ((error = namei(&nd)) != 0)
2715 return (error);
2716 NDFREE(&nd, NDF_ONLY_PNBUF);
2717 error = setfflags(td, nd.ni_vp, flags);
2718 vrele(nd.ni_vp);
2719 return (error);
2720 }
2721
2722 /*
2723 * Change flags of a file given a file descriptor.
2724 */
2725 #ifndef _SYS_SYSPROTO_H_
2726 struct fchflags_args {
2727 int fd;
2728 u_long flags;
2729 };
2730 #endif
2731 int
sys_fchflags(td,uap)2732 sys_fchflags(td, uap)
2733 struct thread *td;
2734 register struct fchflags_args /* {
2735 int fd;
2736 u_long flags;
2737 } */ *uap;
2738 {
2739 struct file *fp;
2740 cap_rights_t rights;
2741 int error;
2742
2743 AUDIT_ARG_FD(uap->fd);
2744 AUDIT_ARG_FFLAGS(uap->flags);
2745 error = getvnode(td->td_proc->p_fd, uap->fd,
2746 cap_rights_init(&rights, CAP_FCHFLAGS), &fp);
2747 if (error != 0)
2748 return (error);
2749 #ifdef AUDIT
2750 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2751 AUDIT_ARG_VNODE1(fp->f_vnode);
2752 VOP_UNLOCK(fp->f_vnode, 0);
2753 #endif
2754 error = setfflags(td, fp->f_vnode, uap->flags);
2755 fdrop(fp, td);
2756 return (error);
2757 }
2758
2759 /*
2760 * Common implementation code for chmod(), lchmod() and fchmod().
2761 */
2762 int
setfmode(td,cred,vp,mode)2763 setfmode(td, cred, vp, mode)
2764 struct thread *td;
2765 struct ucred *cred;
2766 struct vnode *vp;
2767 int mode;
2768 {
2769 struct mount *mp;
2770 struct vattr vattr;
2771 int error;
2772
2773 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2774 return (error);
2775 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2776 VATTR_NULL(&vattr);
2777 vattr.va_mode = mode & ALLPERMS;
2778 #ifdef MAC
2779 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2780 if (error == 0)
2781 #endif
2782 error = VOP_SETATTR(vp, &vattr, cred);
2783 VOP_UNLOCK(vp, 0);
2784 vn_finished_write(mp);
2785 return (error);
2786 }
2787
2788 /*
2789 * Change mode of a file given path name.
2790 */
2791 #ifndef _SYS_SYSPROTO_H_
2792 struct chmod_args {
2793 char *path;
2794 int mode;
2795 };
2796 #endif
2797 int
sys_chmod(td,uap)2798 sys_chmod(td, uap)
2799 struct thread *td;
2800 register struct chmod_args /* {
2801 char *path;
2802 int mode;
2803 } */ *uap;
2804 {
2805
2806 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
2807 }
2808
2809 #ifndef _SYS_SYSPROTO_H_
2810 struct fchmodat_args {
2811 int dirfd;
2812 char *path;
2813 mode_t mode;
2814 int flag;
2815 }
2816 #endif
2817 int
sys_fchmodat(struct thread * td,struct fchmodat_args * uap)2818 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2819 {
2820 int flag = uap->flag;
2821 int fd = uap->fd;
2822 char *path = uap->path;
2823 mode_t mode = uap->mode;
2824
2825 if (flag & ~AT_SYMLINK_NOFOLLOW)
2826 return (EINVAL);
2827
2828 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2829 }
2830
2831 int
kern_chmod(struct thread * td,char * path,enum uio_seg pathseg,int mode)2832 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2833 {
2834
2835 return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0));
2836 }
2837
2838 /*
2839 * Change mode of a file given path name (don't follow links.)
2840 */
2841 #ifndef _SYS_SYSPROTO_H_
2842 struct lchmod_args {
2843 char *path;
2844 int mode;
2845 };
2846 #endif
2847 int
sys_lchmod(td,uap)2848 sys_lchmod(td, uap)
2849 struct thread *td;
2850 register struct lchmod_args /* {
2851 char *path;
2852 int mode;
2853 } */ *uap;
2854 {
2855
2856 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2857 uap->mode, AT_SYMLINK_NOFOLLOW));
2858 }
2859
2860 int
kern_fchmodat(struct thread * td,int fd,char * path,enum uio_seg pathseg,mode_t mode,int flag)2861 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2862 mode_t mode, int flag)
2863 {
2864 struct nameidata nd;
2865 cap_rights_t rights;
2866 int error, follow;
2867
2868 AUDIT_ARG_MODE(mode);
2869 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2870 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2871 cap_rights_init(&rights, CAP_FCHMOD), td);
2872 if ((error = namei(&nd)) != 0)
2873 return (error);
2874 NDFREE(&nd, NDF_ONLY_PNBUF);
2875 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2876 vrele(nd.ni_vp);
2877 return (error);
2878 }
2879
2880 /*
2881 * Change mode of a file given a file descriptor.
2882 */
2883 #ifndef _SYS_SYSPROTO_H_
2884 struct fchmod_args {
2885 int fd;
2886 int mode;
2887 };
2888 #endif
2889 int
sys_fchmod(struct thread * td,struct fchmod_args * uap)2890 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2891 {
2892 struct file *fp;
2893 cap_rights_t rights;
2894 int error;
2895
2896 AUDIT_ARG_FD(uap->fd);
2897 AUDIT_ARG_MODE(uap->mode);
2898
2899 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHMOD), &fp);
2900 if (error != 0)
2901 return (error);
2902 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2903 fdrop(fp, td);
2904 return (error);
2905 }
2906
2907 /*
2908 * Common implementation for chown(), lchown(), and fchown()
2909 */
2910 int
setfown(td,cred,vp,uid,gid)2911 setfown(td, cred, vp, uid, gid)
2912 struct thread *td;
2913 struct ucred *cred;
2914 struct vnode *vp;
2915 uid_t uid;
2916 gid_t gid;
2917 {
2918 struct mount *mp;
2919 struct vattr vattr;
2920 int error;
2921
2922 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2923 return (error);
2924 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2925 VATTR_NULL(&vattr);
2926 vattr.va_uid = uid;
2927 vattr.va_gid = gid;
2928 #ifdef MAC
2929 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
2930 vattr.va_gid);
2931 if (error == 0)
2932 #endif
2933 error = VOP_SETATTR(vp, &vattr, cred);
2934 VOP_UNLOCK(vp, 0);
2935 vn_finished_write(mp);
2936 return (error);
2937 }
2938
2939 /*
2940 * Set ownership given a path name.
2941 */
2942 #ifndef _SYS_SYSPROTO_H_
2943 struct chown_args {
2944 char *path;
2945 int uid;
2946 int gid;
2947 };
2948 #endif
2949 int
sys_chown(td,uap)2950 sys_chown(td, uap)
2951 struct thread *td;
2952 register struct chown_args /* {
2953 char *path;
2954 int uid;
2955 int gid;
2956 } */ *uap;
2957 {
2958
2959 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
2960 }
2961
2962 #ifndef _SYS_SYSPROTO_H_
2963 struct fchownat_args {
2964 int fd;
2965 const char * path;
2966 uid_t uid;
2967 gid_t gid;
2968 int flag;
2969 };
2970 #endif
2971 int
sys_fchownat(struct thread * td,struct fchownat_args * uap)2972 sys_fchownat(struct thread *td, struct fchownat_args *uap)
2973 {
2974 int flag;
2975
2976 flag = uap->flag;
2977 if (flag & ~AT_SYMLINK_NOFOLLOW)
2978 return (EINVAL);
2979
2980 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
2981 uap->gid, uap->flag));
2982 }
2983
2984 int
kern_chown(struct thread * td,char * path,enum uio_seg pathseg,int uid,int gid)2985 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
2986 int gid)
2987 {
2988
2989 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0));
2990 }
2991
2992 int
kern_fchownat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int uid,int gid,int flag)2993 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2994 int uid, int gid, int flag)
2995 {
2996 struct nameidata nd;
2997 cap_rights_t rights;
2998 int error, follow;
2999
3000 AUDIT_ARG_OWNER(uid, gid);
3001 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
3002 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
3003 cap_rights_init(&rights, CAP_FCHOWN), td);
3004
3005 if ((error = namei(&nd)) != 0)
3006 return (error);
3007 NDFREE(&nd, NDF_ONLY_PNBUF);
3008 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
3009 vrele(nd.ni_vp);
3010 return (error);
3011 }
3012
3013 /*
3014 * Set ownership given a path name, do not cross symlinks.
3015 */
3016 #ifndef _SYS_SYSPROTO_H_
3017 struct lchown_args {
3018 char *path;
3019 int uid;
3020 int gid;
3021 };
3022 #endif
3023 int
sys_lchown(td,uap)3024 sys_lchown(td, uap)
3025 struct thread *td;
3026 register struct lchown_args /* {
3027 char *path;
3028 int uid;
3029 int gid;
3030 } */ *uap;
3031 {
3032
3033 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
3034 }
3035
3036 int
kern_lchown(struct thread * td,char * path,enum uio_seg pathseg,int uid,int gid)3037 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3038 int gid)
3039 {
3040
3041 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid,
3042 AT_SYMLINK_NOFOLLOW));
3043 }
3044
3045 /*
3046 * Set ownership given a file descriptor.
3047 */
3048 #ifndef _SYS_SYSPROTO_H_
3049 struct fchown_args {
3050 int fd;
3051 int uid;
3052 int gid;
3053 };
3054 #endif
3055 int
sys_fchown(td,uap)3056 sys_fchown(td, uap)
3057 struct thread *td;
3058 register struct fchown_args /* {
3059 int fd;
3060 int uid;
3061 int gid;
3062 } */ *uap;
3063 {
3064 struct file *fp;
3065 cap_rights_t rights;
3066 int error;
3067
3068 AUDIT_ARG_FD(uap->fd);
3069 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3070 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHOWN), &fp);
3071 if (error != 0)
3072 return (error);
3073 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3074 fdrop(fp, td);
3075 return (error);
3076 }
3077
3078 /*
3079 * Common implementation code for utimes(), lutimes(), and futimes().
3080 */
3081 static int
getutimes(usrtvp,tvpseg,tsp)3082 getutimes(usrtvp, tvpseg, tsp)
3083 const struct timeval *usrtvp;
3084 enum uio_seg tvpseg;
3085 struct timespec *tsp;
3086 {
3087 struct timeval tv[2];
3088 const struct timeval *tvp;
3089 int error;
3090
3091 if (usrtvp == NULL) {
3092 vfs_timestamp(&tsp[0]);
3093 tsp[1] = tsp[0];
3094 } else {
3095 if (tvpseg == UIO_SYSSPACE) {
3096 tvp = usrtvp;
3097 } else {
3098 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3099 return (error);
3100 tvp = tv;
3101 }
3102
3103 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3104 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3105 return (EINVAL);
3106 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3107 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3108 }
3109 return (0);
3110 }
3111
3112 /*
3113 * Common implementation code for utimes(), lutimes(), and futimes().
3114 */
3115 static int
setutimes(td,vp,ts,numtimes,nullflag)3116 setutimes(td, vp, ts, numtimes, nullflag)
3117 struct thread *td;
3118 struct vnode *vp;
3119 const struct timespec *ts;
3120 int numtimes;
3121 int nullflag;
3122 {
3123 struct mount *mp;
3124 struct vattr vattr;
3125 int error, setbirthtime;
3126
3127 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3128 return (error);
3129 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3130 setbirthtime = 0;
3131 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3132 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3133 setbirthtime = 1;
3134 VATTR_NULL(&vattr);
3135 vattr.va_atime = ts[0];
3136 vattr.va_mtime = ts[1];
3137 if (setbirthtime)
3138 vattr.va_birthtime = ts[1];
3139 if (numtimes > 2)
3140 vattr.va_birthtime = ts[2];
3141 if (nullflag)
3142 vattr.va_vaflags |= VA_UTIMES_NULL;
3143 #ifdef MAC
3144 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3145 vattr.va_mtime);
3146 #endif
3147 if (error == 0)
3148 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3149 VOP_UNLOCK(vp, 0);
3150 vn_finished_write(mp);
3151 return (error);
3152 }
3153
3154 /*
3155 * Set the access and modification times of a file.
3156 */
3157 #ifndef _SYS_SYSPROTO_H_
3158 struct utimes_args {
3159 char *path;
3160 struct timeval *tptr;
3161 };
3162 #endif
3163 int
sys_utimes(td,uap)3164 sys_utimes(td, uap)
3165 struct thread *td;
3166 register struct utimes_args /* {
3167 char *path;
3168 struct timeval *tptr;
3169 } */ *uap;
3170 {
3171
3172 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3173 UIO_USERSPACE));
3174 }
3175
3176 #ifndef _SYS_SYSPROTO_H_
3177 struct futimesat_args {
3178 int fd;
3179 const char * path;
3180 const struct timeval * times;
3181 };
3182 #endif
3183 int
sys_futimesat(struct thread * td,struct futimesat_args * uap)3184 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3185 {
3186
3187 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3188 uap->times, UIO_USERSPACE));
3189 }
3190
3191 int
kern_utimes(struct thread * td,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3192 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
3193 struct timeval *tptr, enum uio_seg tptrseg)
3194 {
3195
3196 return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg));
3197 }
3198
3199 int
kern_utimesat(struct thread * td,int fd,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3200 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3201 struct timeval *tptr, enum uio_seg tptrseg)
3202 {
3203 struct nameidata nd;
3204 struct timespec ts[2];
3205 cap_rights_t rights;
3206 int error;
3207
3208 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3209 return (error);
3210 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3211 cap_rights_init(&rights, CAP_FUTIMES), td);
3212
3213 if ((error = namei(&nd)) != 0)
3214 return (error);
3215 NDFREE(&nd, NDF_ONLY_PNBUF);
3216 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3217 vrele(nd.ni_vp);
3218 return (error);
3219 }
3220
3221 /*
3222 * Set the access and modification times of a file.
3223 */
3224 #ifndef _SYS_SYSPROTO_H_
3225 struct lutimes_args {
3226 char *path;
3227 struct timeval *tptr;
3228 };
3229 #endif
3230 int
sys_lutimes(td,uap)3231 sys_lutimes(td, uap)
3232 struct thread *td;
3233 register struct lutimes_args /* {
3234 char *path;
3235 struct timeval *tptr;
3236 } */ *uap;
3237 {
3238
3239 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3240 UIO_USERSPACE));
3241 }
3242
3243 int
kern_lutimes(struct thread * td,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3244 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
3245 struct timeval *tptr, enum uio_seg tptrseg)
3246 {
3247 struct timespec ts[2];
3248 struct nameidata nd;
3249 int error;
3250
3251 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3252 return (error);
3253 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
3254 if ((error = namei(&nd)) != 0)
3255 return (error);
3256 NDFREE(&nd, NDF_ONLY_PNBUF);
3257 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3258 vrele(nd.ni_vp);
3259 return (error);
3260 }
3261
3262 /*
3263 * Set the access and modification times of a file.
3264 */
3265 #ifndef _SYS_SYSPROTO_H_
3266 struct futimes_args {
3267 int fd;
3268 struct timeval *tptr;
3269 };
3270 #endif
3271 int
sys_futimes(td,uap)3272 sys_futimes(td, uap)
3273 struct thread *td;
3274 register struct futimes_args /* {
3275 int fd;
3276 struct timeval *tptr;
3277 } */ *uap;
3278 {
3279
3280 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3281 }
3282
3283 int
kern_futimes(struct thread * td,int fd,struct timeval * tptr,enum uio_seg tptrseg)3284 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3285 enum uio_seg tptrseg)
3286 {
3287 struct timespec ts[2];
3288 struct file *fp;
3289 cap_rights_t rights;
3290 int error;
3291
3292 AUDIT_ARG_FD(fd);
3293 error = getutimes(tptr, tptrseg, ts);
3294 if (error != 0)
3295 return (error);
3296 error = getvnode(td->td_proc->p_fd, fd,
3297 cap_rights_init(&rights, CAP_FUTIMES), &fp);
3298 if (error != 0)
3299 return (error);
3300 #ifdef AUDIT
3301 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3302 AUDIT_ARG_VNODE1(fp->f_vnode);
3303 VOP_UNLOCK(fp->f_vnode, 0);
3304 #endif
3305 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3306 fdrop(fp, td);
3307 return (error);
3308 }
3309
3310 /*
3311 * Truncate a file given its path name.
3312 */
3313 #ifndef _SYS_SYSPROTO_H_
3314 struct truncate_args {
3315 char *path;
3316 int pad;
3317 off_t length;
3318 };
3319 #endif
3320 int
sys_truncate(td,uap)3321 sys_truncate(td, uap)
3322 struct thread *td;
3323 register struct truncate_args /* {
3324 char *path;
3325 int pad;
3326 off_t length;
3327 } */ *uap;
3328 {
3329
3330 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3331 }
3332
3333 int
kern_truncate(struct thread * td,char * path,enum uio_seg pathseg,off_t length)3334 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3335 {
3336 struct mount *mp;
3337 struct vnode *vp;
3338 void *rl_cookie;
3339 struct vattr vattr;
3340 struct nameidata nd;
3341 int error;
3342
3343 if (length < 0)
3344 return(EINVAL);
3345 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
3346 if ((error = namei(&nd)) != 0)
3347 return (error);
3348 vp = nd.ni_vp;
3349 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3350 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3351 vn_rangelock_unlock(vp, rl_cookie);
3352 vrele(vp);
3353 return (error);
3354 }
3355 NDFREE(&nd, NDF_ONLY_PNBUF);
3356 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3357 if (vp->v_type == VDIR)
3358 error = EISDIR;
3359 #ifdef MAC
3360 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3361 }
3362 #endif
3363 else if ((error = vn_writechk(vp)) == 0 &&
3364 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3365 VATTR_NULL(&vattr);
3366 vattr.va_size = length;
3367 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3368 }
3369 VOP_UNLOCK(vp, 0);
3370 vn_finished_write(mp);
3371 vn_rangelock_unlock(vp, rl_cookie);
3372 vrele(vp);
3373 return (error);
3374 }
3375
3376 #if defined(COMPAT_43)
3377 /*
3378 * Truncate a file given its path name.
3379 */
3380 #ifndef _SYS_SYSPROTO_H_
3381 struct otruncate_args {
3382 char *path;
3383 long length;
3384 };
3385 #endif
3386 int
otruncate(td,uap)3387 otruncate(td, uap)
3388 struct thread *td;
3389 register struct otruncate_args /* {
3390 char *path;
3391 long length;
3392 } */ *uap;
3393 {
3394 struct truncate_args /* {
3395 char *path;
3396 int pad;
3397 off_t length;
3398 } */ nuap;
3399
3400 nuap.path = uap->path;
3401 nuap.length = uap->length;
3402 return (sys_truncate(td, &nuap));
3403 }
3404 #endif /* COMPAT_43 */
3405
3406 /* Versions with the pad argument */
3407 int
freebsd6_truncate(struct thread * td,struct freebsd6_truncate_args * uap)3408 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3409 {
3410 struct truncate_args ouap;
3411
3412 ouap.path = uap->path;
3413 ouap.length = uap->length;
3414 return (sys_truncate(td, &ouap));
3415 }
3416
3417 int
freebsd6_ftruncate(struct thread * td,struct freebsd6_ftruncate_args * uap)3418 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3419 {
3420 struct ftruncate_args ouap;
3421
3422 ouap.fd = uap->fd;
3423 ouap.length = uap->length;
3424 return (sys_ftruncate(td, &ouap));
3425 }
3426
3427 /*
3428 * Sync an open file.
3429 */
3430 #ifndef _SYS_SYSPROTO_H_
3431 struct fsync_args {
3432 int fd;
3433 };
3434 #endif
3435 int
sys_fsync(td,uap)3436 sys_fsync(td, uap)
3437 struct thread *td;
3438 struct fsync_args /* {
3439 int fd;
3440 } */ *uap;
3441 {
3442 struct vnode *vp;
3443 struct mount *mp;
3444 struct file *fp;
3445 cap_rights_t rights;
3446 int error, lock_flags;
3447
3448 AUDIT_ARG_FD(uap->fd);
3449 error = getvnode(td->td_proc->p_fd, uap->fd,
3450 cap_rights_init(&rights, CAP_FSYNC), &fp);
3451 if (error != 0)
3452 return (error);
3453 vp = fp->f_vnode;
3454 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3455 if (error != 0)
3456 goto drop;
3457 if (MNT_SHARED_WRITES(mp) ||
3458 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3459 lock_flags = LK_SHARED;
3460 } else {
3461 lock_flags = LK_EXCLUSIVE;
3462 }
3463 vn_lock(vp, lock_flags | LK_RETRY);
3464 AUDIT_ARG_VNODE1(vp);
3465 if (vp->v_object != NULL) {
3466 VM_OBJECT_WLOCK(vp->v_object);
3467 vm_object_page_clean(vp->v_object, 0, 0, 0);
3468 VM_OBJECT_WUNLOCK(vp->v_object);
3469 }
3470 error = VOP_FSYNC(vp, MNT_WAIT, td);
3471
3472 VOP_UNLOCK(vp, 0);
3473 vn_finished_write(mp);
3474 drop:
3475 fdrop(fp, td);
3476 return (error);
3477 }
3478
3479 /*
3480 * Rename files. Source and destination must either both be directories, or
3481 * both not be directories. If target is a directory, it must be empty.
3482 */
3483 #ifndef _SYS_SYSPROTO_H_
3484 struct rename_args {
3485 char *from;
3486 char *to;
3487 };
3488 #endif
3489 int
sys_rename(td,uap)3490 sys_rename(td, uap)
3491 struct thread *td;
3492 register struct rename_args /* {
3493 char *from;
3494 char *to;
3495 } */ *uap;
3496 {
3497
3498 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
3499 }
3500
3501 #ifndef _SYS_SYSPROTO_H_
3502 struct renameat_args {
3503 int oldfd;
3504 char *old;
3505 int newfd;
3506 char *new;
3507 };
3508 #endif
3509 int
sys_renameat(struct thread * td,struct renameat_args * uap)3510 sys_renameat(struct thread *td, struct renameat_args *uap)
3511 {
3512
3513 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3514 UIO_USERSPACE));
3515 }
3516
3517 int
kern_rename(struct thread * td,char * from,char * to,enum uio_seg pathseg)3518 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
3519 {
3520
3521 return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg));
3522 }
3523
3524 int
kern_renameat(struct thread * td,int oldfd,char * old,int newfd,char * new,enum uio_seg pathseg)3525 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3526 enum uio_seg pathseg)
3527 {
3528 struct mount *mp = NULL;
3529 struct vnode *tvp, *fvp, *tdvp;
3530 struct nameidata fromnd, tond;
3531 cap_rights_t rights;
3532 int error;
3533
3534 again:
3535 bwillwrite();
3536 #ifdef MAC
3537 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3538 AUDITVNODE1, pathseg, old, oldfd,
3539 cap_rights_init(&rights, CAP_RENAMEAT), td);
3540 #else
3541 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
3542 pathseg, old, oldfd, cap_rights_init(&rights, CAP_RENAMEAT), td);
3543 #endif
3544
3545 if ((error = namei(&fromnd)) != 0)
3546 return (error);
3547 #ifdef MAC
3548 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3549 fromnd.ni_vp, &fromnd.ni_cnd);
3550 VOP_UNLOCK(fromnd.ni_dvp, 0);
3551 if (fromnd.ni_dvp != fromnd.ni_vp)
3552 VOP_UNLOCK(fromnd.ni_vp, 0);
3553 #endif
3554 fvp = fromnd.ni_vp;
3555 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
3556 SAVESTART | AUDITVNODE2, pathseg, new, newfd,
3557 cap_rights_init(&rights, CAP_LINKAT), td);
3558 if (fromnd.ni_vp->v_type == VDIR)
3559 tond.ni_cnd.cn_flags |= WILLBEDIR;
3560 if ((error = namei(&tond)) != 0) {
3561 /* Translate error code for rename("dir1", "dir2/."). */
3562 if (error == EISDIR && fvp->v_type == VDIR)
3563 error = EINVAL;
3564 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3565 vrele(fromnd.ni_dvp);
3566 vrele(fvp);
3567 goto out1;
3568 }
3569 tdvp = tond.ni_dvp;
3570 tvp = tond.ni_vp;
3571 error = vn_start_write(fvp, &mp, V_NOWAIT);
3572 if (error != 0) {
3573 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3574 NDFREE(&tond, NDF_ONLY_PNBUF);
3575 if (tvp != NULL)
3576 vput(tvp);
3577 if (tdvp == tvp)
3578 vrele(tdvp);
3579 else
3580 vput(tdvp);
3581 vrele(fromnd.ni_dvp);
3582 vrele(fvp);
3583 vrele(tond.ni_startdir);
3584 if (fromnd.ni_startdir != NULL)
3585 vrele(fromnd.ni_startdir);
3586 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
3587 if (error != 0)
3588 return (error);
3589 goto again;
3590 }
3591 if (tvp != NULL) {
3592 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3593 error = ENOTDIR;
3594 goto out;
3595 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3596 error = EISDIR;
3597 goto out;
3598 }
3599 #ifdef CAPABILITIES
3600 if (newfd != AT_FDCWD) {
3601 /*
3602 * If the target already exists we require CAP_UNLINKAT
3603 * from 'newfd'.
3604 */
3605 error = cap_check(&tond.ni_filecaps.fc_rights,
3606 cap_rights_init(&rights, CAP_UNLINKAT));
3607 if (error != 0)
3608 goto out;
3609 }
3610 #endif
3611 }
3612 if (fvp == tdvp) {
3613 error = EINVAL;
3614 goto out;
3615 }
3616 /*
3617 * If the source is the same as the destination (that is, if they
3618 * are links to the same vnode), then there is nothing to do.
3619 */
3620 if (fvp == tvp)
3621 error = -1;
3622 #ifdef MAC
3623 else
3624 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3625 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3626 #endif
3627 out:
3628 if (error == 0) {
3629 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3630 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3631 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3632 NDFREE(&tond, NDF_ONLY_PNBUF);
3633 } else {
3634 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3635 NDFREE(&tond, NDF_ONLY_PNBUF);
3636 if (tvp != NULL)
3637 vput(tvp);
3638 if (tdvp == tvp)
3639 vrele(tdvp);
3640 else
3641 vput(tdvp);
3642 vrele(fromnd.ni_dvp);
3643 vrele(fvp);
3644 }
3645 vrele(tond.ni_startdir);
3646 vn_finished_write(mp);
3647 out1:
3648 if (fromnd.ni_startdir)
3649 vrele(fromnd.ni_startdir);
3650 if (error == -1)
3651 return (0);
3652 return (error);
3653 }
3654
3655 /*
3656 * Make a directory file.
3657 */
3658 #ifndef _SYS_SYSPROTO_H_
3659 struct mkdir_args {
3660 char *path;
3661 int mode;
3662 };
3663 #endif
3664 int
sys_mkdir(td,uap)3665 sys_mkdir(td, uap)
3666 struct thread *td;
3667 register struct mkdir_args /* {
3668 char *path;
3669 int mode;
3670 } */ *uap;
3671 {
3672
3673 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
3674 }
3675
3676 #ifndef _SYS_SYSPROTO_H_
3677 struct mkdirat_args {
3678 int fd;
3679 char *path;
3680 mode_t mode;
3681 };
3682 #endif
3683 int
sys_mkdirat(struct thread * td,struct mkdirat_args * uap)3684 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3685 {
3686
3687 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3688 }
3689
3690 int
kern_mkdir(struct thread * td,char * path,enum uio_seg segflg,int mode)3691 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
3692 {
3693
3694 return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode));
3695 }
3696
3697 int
kern_mkdirat(struct thread * td,int fd,char * path,enum uio_seg segflg,int mode)3698 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3699 int mode)
3700 {
3701 struct mount *mp;
3702 struct vnode *vp;
3703 struct vattr vattr;
3704 struct nameidata nd;
3705 cap_rights_t rights;
3706 int error;
3707
3708 AUDIT_ARG_MODE(mode);
3709 restart:
3710 bwillwrite();
3711 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
3712 NOCACHE, segflg, path, fd, cap_rights_init(&rights, CAP_MKDIRAT),
3713 td);
3714 nd.ni_cnd.cn_flags |= WILLBEDIR;
3715 if ((error = namei(&nd)) != 0)
3716 return (error);
3717 vp = nd.ni_vp;
3718 if (vp != NULL) {
3719 NDFREE(&nd, NDF_ONLY_PNBUF);
3720 /*
3721 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3722 * the strange behaviour of leaving the vnode unlocked
3723 * if the target is the same vnode as the parent.
3724 */
3725 if (vp == nd.ni_dvp)
3726 vrele(nd.ni_dvp);
3727 else
3728 vput(nd.ni_dvp);
3729 vrele(vp);
3730 return (EEXIST);
3731 }
3732 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3733 NDFREE(&nd, NDF_ONLY_PNBUF);
3734 vput(nd.ni_dvp);
3735 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3736 return (error);
3737 goto restart;
3738 }
3739 VATTR_NULL(&vattr);
3740 vattr.va_type = VDIR;
3741 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3742 #ifdef MAC
3743 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3744 &vattr);
3745 if (error != 0)
3746 goto out;
3747 #endif
3748 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3749 #ifdef MAC
3750 out:
3751 #endif
3752 NDFREE(&nd, NDF_ONLY_PNBUF);
3753 vput(nd.ni_dvp);
3754 if (error == 0)
3755 vput(nd.ni_vp);
3756 vn_finished_write(mp);
3757 return (error);
3758 }
3759
3760 /*
3761 * Remove a directory file.
3762 */
3763 #ifndef _SYS_SYSPROTO_H_
3764 struct rmdir_args {
3765 char *path;
3766 };
3767 #endif
3768 int
sys_rmdir(td,uap)3769 sys_rmdir(td, uap)
3770 struct thread *td;
3771 struct rmdir_args /* {
3772 char *path;
3773 } */ *uap;
3774 {
3775
3776 return (kern_rmdir(td, uap->path, UIO_USERSPACE));
3777 }
3778
3779 int
kern_rmdir(struct thread * td,char * path,enum uio_seg pathseg)3780 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
3781 {
3782
3783 return (kern_rmdirat(td, AT_FDCWD, path, pathseg));
3784 }
3785
3786 int
kern_rmdirat(struct thread * td,int fd,char * path,enum uio_seg pathseg)3787 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3788 {
3789 struct mount *mp;
3790 struct vnode *vp;
3791 struct nameidata nd;
3792 cap_rights_t rights;
3793 int error;
3794
3795 restart:
3796 bwillwrite();
3797 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3798 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
3799 if ((error = namei(&nd)) != 0)
3800 return (error);
3801 vp = nd.ni_vp;
3802 if (vp->v_type != VDIR) {
3803 error = ENOTDIR;
3804 goto out;
3805 }
3806 /*
3807 * No rmdir "." please.
3808 */
3809 if (nd.ni_dvp == vp) {
3810 error = EINVAL;
3811 goto out;
3812 }
3813 /*
3814 * The root of a mounted filesystem cannot be deleted.
3815 */
3816 if (vp->v_vflag & VV_ROOT) {
3817 error = EBUSY;
3818 goto out;
3819 }
3820 #ifdef MAC
3821 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3822 &nd.ni_cnd);
3823 if (error != 0)
3824 goto out;
3825 #endif
3826 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3827 NDFREE(&nd, NDF_ONLY_PNBUF);
3828 vput(vp);
3829 if (nd.ni_dvp == vp)
3830 vrele(nd.ni_dvp);
3831 else
3832 vput(nd.ni_dvp);
3833 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3834 return (error);
3835 goto restart;
3836 }
3837 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3838 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3839 vn_finished_write(mp);
3840 out:
3841 NDFREE(&nd, NDF_ONLY_PNBUF);
3842 vput(vp);
3843 if (nd.ni_dvp == vp)
3844 vrele(nd.ni_dvp);
3845 else
3846 vput(nd.ni_dvp);
3847 return (error);
3848 }
3849
3850 #ifdef COMPAT_43
3851 /*
3852 * Read a block of directory entries in a filesystem independent format.
3853 */
3854 #ifndef _SYS_SYSPROTO_H_
3855 struct ogetdirentries_args {
3856 int fd;
3857 char *buf;
3858 u_int count;
3859 long *basep;
3860 };
3861 #endif
3862 int
ogetdirentries(struct thread * td,struct ogetdirentries_args * uap)3863 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
3864 {
3865 long loff;
3866 int error;
3867
3868 error = kern_ogetdirentries(td, uap, &loff);
3869 if (error == 0)
3870 error = copyout(&loff, uap->basep, sizeof(long));
3871 return (error);
3872 }
3873
3874 int
kern_ogetdirentries(struct thread * td,struct ogetdirentries_args * uap,long * ploff)3875 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
3876 long *ploff)
3877 {
3878 struct vnode *vp;
3879 struct file *fp;
3880 struct uio auio, kuio;
3881 struct iovec aiov, kiov;
3882 struct dirent *dp, *edp;
3883 cap_rights_t rights;
3884 caddr_t dirbuf;
3885 int error, eofflag, readcnt;
3886 long loff;
3887 off_t foffset;
3888
3889 /* XXX arbitrary sanity limit on `count'. */
3890 if (uap->count > 64 * 1024)
3891 return (EINVAL);
3892 error = getvnode(td->td_proc->p_fd, uap->fd,
3893 cap_rights_init(&rights, CAP_READ), &fp);
3894 if (error != 0)
3895 return (error);
3896 if ((fp->f_flag & FREAD) == 0) {
3897 fdrop(fp, td);
3898 return (EBADF);
3899 }
3900 vp = fp->f_vnode;
3901 foffset = foffset_lock(fp, 0);
3902 unionread:
3903 if (vp->v_type != VDIR) {
3904 foffset_unlock(fp, foffset, 0);
3905 fdrop(fp, td);
3906 return (EINVAL);
3907 }
3908 aiov.iov_base = uap->buf;
3909 aiov.iov_len = uap->count;
3910 auio.uio_iov = &aiov;
3911 auio.uio_iovcnt = 1;
3912 auio.uio_rw = UIO_READ;
3913 auio.uio_segflg = UIO_USERSPACE;
3914 auio.uio_td = td;
3915 auio.uio_resid = uap->count;
3916 vn_lock(vp, LK_SHARED | LK_RETRY);
3917 loff = auio.uio_offset = foffset;
3918 #ifdef MAC
3919 error = mac_vnode_check_readdir(td->td_ucred, vp);
3920 if (error != 0) {
3921 VOP_UNLOCK(vp, 0);
3922 foffset_unlock(fp, foffset, FOF_NOUPDATE);
3923 fdrop(fp, td);
3924 return (error);
3925 }
3926 #endif
3927 # if (BYTE_ORDER != LITTLE_ENDIAN)
3928 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
3929 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
3930 NULL, NULL);
3931 foffset = auio.uio_offset;
3932 } else
3933 # endif
3934 {
3935 kuio = auio;
3936 kuio.uio_iov = &kiov;
3937 kuio.uio_segflg = UIO_SYSSPACE;
3938 kiov.iov_len = uap->count;
3939 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK);
3940 kiov.iov_base = dirbuf;
3941 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
3942 NULL, NULL);
3943 foffset = kuio.uio_offset;
3944 if (error == 0) {
3945 readcnt = uap->count - kuio.uio_resid;
3946 edp = (struct dirent *)&dirbuf[readcnt];
3947 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
3948 # if (BYTE_ORDER == LITTLE_ENDIAN)
3949 /*
3950 * The expected low byte of
3951 * dp->d_namlen is our dp->d_type.
3952 * The high MBZ byte of dp->d_namlen
3953 * is our dp->d_namlen.
3954 */
3955 dp->d_type = dp->d_namlen;
3956 dp->d_namlen = 0;
3957 # else
3958 /*
3959 * The dp->d_type is the high byte
3960 * of the expected dp->d_namlen,
3961 * so must be zero'ed.
3962 */
3963 dp->d_type = 0;
3964 # endif
3965 if (dp->d_reclen > 0) {
3966 dp = (struct dirent *)
3967 ((char *)dp + dp->d_reclen);
3968 } else {
3969 error = EIO;
3970 break;
3971 }
3972 }
3973 if (dp >= edp)
3974 error = uiomove(dirbuf, readcnt, &auio);
3975 }
3976 free(dirbuf, M_TEMP);
3977 }
3978 if (error != 0) {
3979 VOP_UNLOCK(vp, 0);
3980 foffset_unlock(fp, foffset, 0);
3981 fdrop(fp, td);
3982 return (error);
3983 }
3984 if (uap->count == auio.uio_resid &&
3985 (vp->v_vflag & VV_ROOT) &&
3986 (vp->v_mount->mnt_flag & MNT_UNION)) {
3987 struct vnode *tvp = vp;
3988 vp = vp->v_mount->mnt_vnodecovered;
3989 VREF(vp);
3990 fp->f_vnode = vp;
3991 fp->f_data = vp;
3992 foffset = 0;
3993 vput(tvp);
3994 goto unionread;
3995 }
3996 VOP_UNLOCK(vp, 0);
3997 foffset_unlock(fp, foffset, 0);
3998 fdrop(fp, td);
3999 td->td_retval[0] = uap->count - auio.uio_resid;
4000 if (error == 0)
4001 *ploff = loff;
4002 return (error);
4003 }
4004 #endif /* COMPAT_43 */
4005
4006 /*
4007 * Read a block of directory entries in a filesystem independent format.
4008 */
4009 #ifndef _SYS_SYSPROTO_H_
4010 struct getdirentries_args {
4011 int fd;
4012 char *buf;
4013 u_int count;
4014 long *basep;
4015 };
4016 #endif
4017 int
sys_getdirentries(td,uap)4018 sys_getdirentries(td, uap)
4019 struct thread *td;
4020 register struct getdirentries_args /* {
4021 int fd;
4022 char *buf;
4023 u_int count;
4024 long *basep;
4025 } */ *uap;
4026 {
4027 long base;
4028 int error;
4029
4030 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
4031 NULL, UIO_USERSPACE);
4032 if (error != 0)
4033 return (error);
4034 if (uap->basep != NULL)
4035 error = copyout(&base, uap->basep, sizeof(long));
4036 return (error);
4037 }
4038
4039 int
kern_getdirentries(struct thread * td,int fd,char * buf,u_int count,long * basep,ssize_t * residp,enum uio_seg bufseg)4040 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count,
4041 long *basep, ssize_t *residp, enum uio_seg bufseg)
4042 {
4043 struct vnode *vp;
4044 struct file *fp;
4045 struct uio auio;
4046 struct iovec aiov;
4047 cap_rights_t rights;
4048 long loff;
4049 int error, eofflag;
4050 off_t foffset;
4051
4052 AUDIT_ARG_FD(fd);
4053 if (count > IOSIZE_MAX)
4054 return (EINVAL);
4055 auio.uio_resid = count;
4056 error = getvnode(td->td_proc->p_fd, fd,
4057 cap_rights_init(&rights, CAP_READ), &fp);
4058 if (error != 0)
4059 return (error);
4060 if ((fp->f_flag & FREAD) == 0) {
4061 fdrop(fp, td);
4062 return (EBADF);
4063 }
4064 vp = fp->f_vnode;
4065 foffset = foffset_lock(fp, 0);
4066 unionread:
4067 if (vp->v_type != VDIR) {
4068 error = EINVAL;
4069 goto fail;
4070 }
4071 aiov.iov_base = buf;
4072 aiov.iov_len = count;
4073 auio.uio_iov = &aiov;
4074 auio.uio_iovcnt = 1;
4075 auio.uio_rw = UIO_READ;
4076 auio.uio_segflg = bufseg;
4077 auio.uio_td = td;
4078 vn_lock(vp, LK_SHARED | LK_RETRY);
4079 AUDIT_ARG_VNODE1(vp);
4080 loff = auio.uio_offset = foffset;
4081 #ifdef MAC
4082 error = mac_vnode_check_readdir(td->td_ucred, vp);
4083 if (error == 0)
4084 #endif
4085 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4086 NULL);
4087 foffset = auio.uio_offset;
4088 if (error != 0) {
4089 VOP_UNLOCK(vp, 0);
4090 goto fail;
4091 }
4092 if (count == auio.uio_resid &&
4093 (vp->v_vflag & VV_ROOT) &&
4094 (vp->v_mount->mnt_flag & MNT_UNION)) {
4095 struct vnode *tvp = vp;
4096
4097 vp = vp->v_mount->mnt_vnodecovered;
4098 VREF(vp);
4099 fp->f_vnode = vp;
4100 fp->f_data = vp;
4101 foffset = 0;
4102 vput(tvp);
4103 goto unionread;
4104 }
4105 VOP_UNLOCK(vp, 0);
4106 *basep = loff;
4107 if (residp != NULL)
4108 *residp = auio.uio_resid;
4109 td->td_retval[0] = count - auio.uio_resid;
4110 fail:
4111 foffset_unlock(fp, foffset, 0);
4112 fdrop(fp, td);
4113 return (error);
4114 }
4115
4116 #ifndef _SYS_SYSPROTO_H_
4117 struct getdents_args {
4118 int fd;
4119 char *buf;
4120 size_t count;
4121 };
4122 #endif
4123 int
sys_getdents(td,uap)4124 sys_getdents(td, uap)
4125 struct thread *td;
4126 register struct getdents_args /* {
4127 int fd;
4128 char *buf;
4129 u_int count;
4130 } */ *uap;
4131 {
4132 struct getdirentries_args ap;
4133
4134 ap.fd = uap->fd;
4135 ap.buf = uap->buf;
4136 ap.count = uap->count;
4137 ap.basep = NULL;
4138 return (sys_getdirentries(td, &ap));
4139 }
4140
4141 /*
4142 * Set the mode mask for creation of filesystem nodes.
4143 */
4144 #ifndef _SYS_SYSPROTO_H_
4145 struct umask_args {
4146 int newmask;
4147 };
4148 #endif
4149 int
sys_umask(td,uap)4150 sys_umask(td, uap)
4151 struct thread *td;
4152 struct umask_args /* {
4153 int newmask;
4154 } */ *uap;
4155 {
4156 register struct filedesc *fdp;
4157
4158 FILEDESC_XLOCK(td->td_proc->p_fd);
4159 fdp = td->td_proc->p_fd;
4160 td->td_retval[0] = fdp->fd_cmask;
4161 fdp->fd_cmask = uap->newmask & ALLPERMS;
4162 FILEDESC_XUNLOCK(td->td_proc->p_fd);
4163 return (0);
4164 }
4165
4166 /*
4167 * Void all references to file by ripping underlying filesystem away from
4168 * vnode.
4169 */
4170 #ifndef _SYS_SYSPROTO_H_
4171 struct revoke_args {
4172 char *path;
4173 };
4174 #endif
4175 int
sys_revoke(td,uap)4176 sys_revoke(td, uap)
4177 struct thread *td;
4178 register struct revoke_args /* {
4179 char *path;
4180 } */ *uap;
4181 {
4182 struct vnode *vp;
4183 struct vattr vattr;
4184 struct nameidata nd;
4185 int error;
4186
4187 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4188 uap->path, td);
4189 if ((error = namei(&nd)) != 0)
4190 return (error);
4191 vp = nd.ni_vp;
4192 NDFREE(&nd, NDF_ONLY_PNBUF);
4193 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4194 error = EINVAL;
4195 goto out;
4196 }
4197 #ifdef MAC
4198 error = mac_vnode_check_revoke(td->td_ucred, vp);
4199 if (error != 0)
4200 goto out;
4201 #endif
4202 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4203 if (error != 0)
4204 goto out;
4205 if (td->td_ucred->cr_uid != vattr.va_uid) {
4206 error = priv_check(td, PRIV_VFS_ADMIN);
4207 if (error != 0)
4208 goto out;
4209 }
4210 if (vcount(vp) > 1)
4211 VOP_REVOKE(vp, REVOKEALL);
4212 out:
4213 vput(vp);
4214 return (error);
4215 }
4216
4217 /*
4218 * Convert a user file descriptor to a kernel file entry and check that, if it
4219 * is a capability, the correct rights are present. A reference on the file
4220 * entry is held upon returning.
4221 */
4222 int
getvnode(struct filedesc * fdp,int fd,cap_rights_t * rightsp,struct file ** fpp)4223 getvnode(struct filedesc *fdp, int fd, cap_rights_t *rightsp, struct file **fpp)
4224 {
4225 struct file *fp;
4226 int error;
4227
4228 error = fget_unlocked(fdp, fd, rightsp, 0, &fp, NULL);
4229 if (error != 0)
4230 return (error);
4231
4232 /*
4233 * The file could be not of the vnode type, or it may be not
4234 * yet fully initialized, in which case the f_vnode pointer
4235 * may be set, but f_ops is still badfileops. E.g.,
4236 * devfs_open() transiently create such situation to
4237 * facilitate csw d_fdopen().
4238 *
4239 * Dupfdopen() handling in kern_openat() installs the
4240 * half-baked file into the process descriptor table, allowing
4241 * other thread to dereference it. Guard against the race by
4242 * checking f_ops.
4243 */
4244 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
4245 fdrop(fp, curthread);
4246 return (EINVAL);
4247 }
4248 *fpp = fp;
4249 return (0);
4250 }
4251
4252
4253 /*
4254 * Get an (NFS) file handle.
4255 */
4256 #ifndef _SYS_SYSPROTO_H_
4257 struct lgetfh_args {
4258 char *fname;
4259 fhandle_t *fhp;
4260 };
4261 #endif
4262 int
sys_lgetfh(td,uap)4263 sys_lgetfh(td, uap)
4264 struct thread *td;
4265 register struct lgetfh_args *uap;
4266 {
4267 struct nameidata nd;
4268 fhandle_t fh;
4269 register struct vnode *vp;
4270 int error;
4271
4272 error = priv_check(td, PRIV_VFS_GETFH);
4273 if (error != 0)
4274 return (error);
4275 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4276 uap->fname, td);
4277 error = namei(&nd);
4278 if (error != 0)
4279 return (error);
4280 NDFREE(&nd, NDF_ONLY_PNBUF);
4281 vp = nd.ni_vp;
4282 bzero(&fh, sizeof(fh));
4283 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4284 error = VOP_VPTOFH(vp, &fh.fh_fid);
4285 vput(vp);
4286 if (error == 0)
4287 error = copyout(&fh, uap->fhp, sizeof (fh));
4288 return (error);
4289 }
4290
4291 #ifndef _SYS_SYSPROTO_H_
4292 struct getfh_args {
4293 char *fname;
4294 fhandle_t *fhp;
4295 };
4296 #endif
4297 int
sys_getfh(td,uap)4298 sys_getfh(td, uap)
4299 struct thread *td;
4300 register struct getfh_args *uap;
4301 {
4302 struct nameidata nd;
4303 fhandle_t fh;
4304 register struct vnode *vp;
4305 int error;
4306
4307 error = priv_check(td, PRIV_VFS_GETFH);
4308 if (error != 0)
4309 return (error);
4310 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4311 uap->fname, td);
4312 error = namei(&nd);
4313 if (error != 0)
4314 return (error);
4315 NDFREE(&nd, NDF_ONLY_PNBUF);
4316 vp = nd.ni_vp;
4317 bzero(&fh, sizeof(fh));
4318 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4319 error = VOP_VPTOFH(vp, &fh.fh_fid);
4320 vput(vp);
4321 if (error == 0)
4322 error = copyout(&fh, uap->fhp, sizeof (fh));
4323 return (error);
4324 }
4325
4326 /*
4327 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4328 * open descriptor.
4329 *
4330 * warning: do not remove the priv_check() call or this becomes one giant
4331 * security hole.
4332 */
4333 #ifndef _SYS_SYSPROTO_H_
4334 struct fhopen_args {
4335 const struct fhandle *u_fhp;
4336 int flags;
4337 };
4338 #endif
4339 int
sys_fhopen(td,uap)4340 sys_fhopen(td, uap)
4341 struct thread *td;
4342 struct fhopen_args /* {
4343 const struct fhandle *u_fhp;
4344 int flags;
4345 } */ *uap;
4346 {
4347 struct mount *mp;
4348 struct vnode *vp;
4349 struct fhandle fhp;
4350 struct file *fp;
4351 int fmode, error;
4352 int indx;
4353
4354 error = priv_check(td, PRIV_VFS_FHOPEN);
4355 if (error != 0)
4356 return (error);
4357 indx = -1;
4358 fmode = FFLAGS(uap->flags);
4359 /* why not allow a non-read/write open for our lockd? */
4360 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4361 return (EINVAL);
4362 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
4363 if (error != 0)
4364 return(error);
4365 /* find the mount point */
4366 mp = vfs_busyfs(&fhp.fh_fsid);
4367 if (mp == NULL)
4368 return (ESTALE);
4369 /* now give me my vnode, it gets returned to me locked */
4370 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4371 vfs_unbusy(mp);
4372 if (error != 0)
4373 return (error);
4374
4375 error = falloc_noinstall(td, &fp);
4376 if (error != 0) {
4377 vput(vp);
4378 return (error);
4379 }
4380 /*
4381 * An extra reference on `fp' has been held for us by
4382 * falloc_noinstall().
4383 */
4384
4385 #ifdef INVARIANTS
4386 td->td_dupfd = -1;
4387 #endif
4388 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4389 if (error != 0) {
4390 KASSERT(fp->f_ops == &badfileops,
4391 ("VOP_OPEN in fhopen() set f_ops"));
4392 KASSERT(td->td_dupfd < 0,
4393 ("fhopen() encountered fdopen()"));
4394
4395 vput(vp);
4396 goto bad;
4397 }
4398 #ifdef INVARIANTS
4399 td->td_dupfd = 0;
4400 #endif
4401 fp->f_vnode = vp;
4402 fp->f_seqcount = 1;
4403 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
4404 &vnops);
4405 VOP_UNLOCK(vp, 0);
4406 if ((fmode & O_TRUNC) != 0) {
4407 error = fo_truncate(fp, 0, td->td_ucred, td);
4408 if (error != 0)
4409 goto bad;
4410 }
4411
4412 error = finstall(td, fp, &indx, fmode, NULL);
4413 bad:
4414 fdrop(fp, td);
4415 td->td_retval[0] = indx;
4416 return (error);
4417 }
4418
4419 /*
4420 * Stat an (NFS) file handle.
4421 */
4422 #ifndef _SYS_SYSPROTO_H_
4423 struct fhstat_args {
4424 struct fhandle *u_fhp;
4425 struct stat *sb;
4426 };
4427 #endif
4428 int
sys_fhstat(td,uap)4429 sys_fhstat(td, uap)
4430 struct thread *td;
4431 register struct fhstat_args /* {
4432 struct fhandle *u_fhp;
4433 struct stat *sb;
4434 } */ *uap;
4435 {
4436 struct stat sb;
4437 struct fhandle fh;
4438 int error;
4439
4440 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4441 if (error != 0)
4442 return (error);
4443 error = kern_fhstat(td, fh, &sb);
4444 if (error == 0)
4445 error = copyout(&sb, uap->sb, sizeof(sb));
4446 return (error);
4447 }
4448
4449 int
kern_fhstat(struct thread * td,struct fhandle fh,struct stat * sb)4450 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4451 {
4452 struct mount *mp;
4453 struct vnode *vp;
4454 int error;
4455
4456 error = priv_check(td, PRIV_VFS_FHSTAT);
4457 if (error != 0)
4458 return (error);
4459 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4460 return (ESTALE);
4461 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4462 vfs_unbusy(mp);
4463 if (error != 0)
4464 return (error);
4465 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
4466 vput(vp);
4467 return (error);
4468 }
4469
4470 /*
4471 * Implement fstatfs() for (NFS) file handles.
4472 */
4473 #ifndef _SYS_SYSPROTO_H_
4474 struct fhstatfs_args {
4475 struct fhandle *u_fhp;
4476 struct statfs *buf;
4477 };
4478 #endif
4479 int
sys_fhstatfs(td,uap)4480 sys_fhstatfs(td, uap)
4481 struct thread *td;
4482 struct fhstatfs_args /* {
4483 struct fhandle *u_fhp;
4484 struct statfs *buf;
4485 } */ *uap;
4486 {
4487 struct statfs sf;
4488 fhandle_t fh;
4489 int error;
4490
4491 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4492 if (error != 0)
4493 return (error);
4494 error = kern_fhstatfs(td, fh, &sf);
4495 if (error != 0)
4496 return (error);
4497 return (copyout(&sf, uap->buf, sizeof(sf)));
4498 }
4499
4500 int
kern_fhstatfs(struct thread * td,fhandle_t fh,struct statfs * buf)4501 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4502 {
4503 struct statfs *sp;
4504 struct mount *mp;
4505 struct vnode *vp;
4506 int error;
4507
4508 error = priv_check(td, PRIV_VFS_FHSTATFS);
4509 if (error != 0)
4510 return (error);
4511 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4512 return (ESTALE);
4513 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4514 if (error != 0) {
4515 vfs_unbusy(mp);
4516 return (error);
4517 }
4518 vput(vp);
4519 error = prison_canseemount(td->td_ucred, mp);
4520 if (error != 0)
4521 goto out;
4522 #ifdef MAC
4523 error = mac_mount_check_stat(td->td_ucred, mp);
4524 if (error != 0)
4525 goto out;
4526 #endif
4527 /*
4528 * Set these in case the underlying filesystem fails to do so.
4529 */
4530 sp = &mp->mnt_stat;
4531 sp->f_version = STATFS_VERSION;
4532 sp->f_namemax = NAME_MAX;
4533 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4534 error = VFS_STATFS(mp, sp);
4535 if (error == 0)
4536 *buf = *sp;
4537 out:
4538 vfs_unbusy(mp);
4539 return (error);
4540 }
4541
4542 int
kern_posix_fallocate(struct thread * td,int fd,off_t offset,off_t len)4543 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
4544 {
4545 struct file *fp;
4546 struct mount *mp;
4547 struct vnode *vp;
4548 cap_rights_t rights;
4549 off_t olen, ooffset;
4550 int error;
4551
4552 if (offset < 0 || len <= 0)
4553 return (EINVAL);
4554 /* Check for wrap. */
4555 if (offset > OFF_MAX - len)
4556 return (EFBIG);
4557 error = fget(td, fd, cap_rights_init(&rights, CAP_WRITE), &fp);
4558 if (error != 0)
4559 return (error);
4560 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4561 error = ESPIPE;
4562 goto out;
4563 }
4564 if ((fp->f_flag & FWRITE) == 0) {
4565 error = EBADF;
4566 goto out;
4567 }
4568 if (fp->f_type != DTYPE_VNODE) {
4569 error = ENODEV;
4570 goto out;
4571 }
4572 vp = fp->f_vnode;
4573 if (vp->v_type != VREG) {
4574 error = ENODEV;
4575 goto out;
4576 }
4577
4578 /* Allocating blocks may take a long time, so iterate. */
4579 for (;;) {
4580 olen = len;
4581 ooffset = offset;
4582
4583 bwillwrite();
4584 mp = NULL;
4585 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
4586 if (error != 0)
4587 break;
4588 error = vn_lock(vp, LK_EXCLUSIVE);
4589 if (error != 0) {
4590 vn_finished_write(mp);
4591 break;
4592 }
4593 #ifdef MAC
4594 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
4595 if (error == 0)
4596 #endif
4597 error = VOP_ALLOCATE(vp, &offset, &len);
4598 VOP_UNLOCK(vp, 0);
4599 vn_finished_write(mp);
4600
4601 if (olen + ooffset != offset + len) {
4602 panic("offset + len changed from %jx/%jx to %jx/%jx",
4603 ooffset, olen, offset, len);
4604 }
4605 if (error != 0 || len == 0)
4606 break;
4607 KASSERT(olen > len, ("Iteration did not make progress?"));
4608 maybe_yield();
4609 }
4610 out:
4611 fdrop(fp, td);
4612 return (error);
4613 }
4614
4615 int
sys_posix_fallocate(struct thread * td,struct posix_fallocate_args * uap)4616 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
4617 {
4618
4619 td->td_retval[0] = kern_posix_fallocate(td, uap->fd, uap->offset,
4620 uap->len);
4621 return (0);
4622 }
4623
4624 /*
4625 * Unlike madvise(2), we do not make a best effort to remember every
4626 * possible caching hint. Instead, we remember the last setting with
4627 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4628 * region of any current setting.
4629 */
4630 int
kern_posix_fadvise(struct thread * td,int fd,off_t offset,off_t len,int advice)4631 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4632 int advice)
4633 {
4634 struct fadvise_info *fa, *new;
4635 struct file *fp;
4636 struct vnode *vp;
4637 cap_rights_t rights;
4638 off_t end;
4639 int error;
4640
4641 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4642 return (EINVAL);
4643 switch (advice) {
4644 case POSIX_FADV_SEQUENTIAL:
4645 case POSIX_FADV_RANDOM:
4646 case POSIX_FADV_NOREUSE:
4647 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4648 break;
4649 case POSIX_FADV_NORMAL:
4650 case POSIX_FADV_WILLNEED:
4651 case POSIX_FADV_DONTNEED:
4652 new = NULL;
4653 break;
4654 default:
4655 return (EINVAL);
4656 }
4657 /* XXX: CAP_POSIX_FADVISE? */
4658 error = fget(td, fd, cap_rights_init(&rights), &fp);
4659 if (error != 0)
4660 goto out;
4661 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4662 error = ESPIPE;
4663 goto out;
4664 }
4665 if (fp->f_type != DTYPE_VNODE) {
4666 error = ENODEV;
4667 goto out;
4668 }
4669 vp = fp->f_vnode;
4670 if (vp->v_type != VREG) {
4671 error = ENODEV;
4672 goto out;
4673 }
4674 if (len == 0)
4675 end = OFF_MAX;
4676 else
4677 end = offset + len - 1;
4678 switch (advice) {
4679 case POSIX_FADV_SEQUENTIAL:
4680 case POSIX_FADV_RANDOM:
4681 case POSIX_FADV_NOREUSE:
4682 /*
4683 * Try to merge any existing non-standard region with
4684 * this new region if possible, otherwise create a new
4685 * non-standard region for this request.
4686 */
4687 mtx_pool_lock(mtxpool_sleep, fp);
4688 fa = fp->f_advice;
4689 if (fa != NULL && fa->fa_advice == advice &&
4690 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4691 (end != OFF_MAX && fa->fa_start == end + 1) ||
4692 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4693 if (offset < fa->fa_start)
4694 fa->fa_start = offset;
4695 if (end > fa->fa_end)
4696 fa->fa_end = end;
4697 } else {
4698 new->fa_advice = advice;
4699 new->fa_start = offset;
4700 new->fa_end = end;
4701 new->fa_prevstart = 0;
4702 new->fa_prevend = 0;
4703 fp->f_advice = new;
4704 new = fa;
4705 }
4706 mtx_pool_unlock(mtxpool_sleep, fp);
4707 break;
4708 case POSIX_FADV_NORMAL:
4709 /*
4710 * If a the "normal" region overlaps with an existing
4711 * non-standard region, trim or remove the
4712 * non-standard region.
4713 */
4714 mtx_pool_lock(mtxpool_sleep, fp);
4715 fa = fp->f_advice;
4716 if (fa != NULL) {
4717 if (offset <= fa->fa_start && end >= fa->fa_end) {
4718 new = fa;
4719 fp->f_advice = NULL;
4720 } else if (offset <= fa->fa_start &&
4721 end >= fa->fa_start)
4722 fa->fa_start = end + 1;
4723 else if (offset <= fa->fa_end && end >= fa->fa_end)
4724 fa->fa_end = offset - 1;
4725 else if (offset >= fa->fa_start && end <= fa->fa_end) {
4726 /*
4727 * If the "normal" region is a middle
4728 * portion of the existing
4729 * non-standard region, just remove
4730 * the whole thing rather than picking
4731 * one side or the other to
4732 * preserve.
4733 */
4734 new = fa;
4735 fp->f_advice = NULL;
4736 }
4737 }
4738 mtx_pool_unlock(mtxpool_sleep, fp);
4739 break;
4740 case POSIX_FADV_WILLNEED:
4741 case POSIX_FADV_DONTNEED:
4742 error = VOP_ADVISE(vp, offset, end, advice);
4743 break;
4744 }
4745 out:
4746 if (fp != NULL)
4747 fdrop(fp, td);
4748 free(new, M_FADVISE);
4749 return (error);
4750 }
4751
4752 int
sys_posix_fadvise(struct thread * td,struct posix_fadvise_args * uap)4753 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4754 {
4755
4756 td->td_retval[0] = kern_posix_fadvise(td, uap->fd, uap->offset,
4757 uap->len, uap->advice);
4758 return (0);
4759 }
4760