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: stable/10/sys/kern/vfs_syscalls.c 325099 2017-10-29 09:48:28Z kib $");
39
40 #include "opt_capsicum.h"
41 #include "opt_compat.h"
42 #include "opt_kdtrace.h"
43 #include "opt_ktrace.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/bio.h>
48 #include <sys/buf.h>
49 #include <sys/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 kern_chflags(struct thread *td, const char *path,
100 enum uio_seg pathseg, u_long flags);
101 static int kern_chflagsat(struct thread *td, int fd, const char *path,
102 enum uio_seg pathseg, u_long flags, int atflag);
103 static int setfflags(struct thread *td, struct vnode *, u_long);
104 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
105 static int getutimens(const struct timespec *, enum uio_seg,
106 struct timespec *, int *);
107 static int setutimes(struct thread *td, struct vnode *,
108 const struct timespec *, int, int);
109 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
110 struct thread *td);
111
112 /*
113 * The module initialization routine for POSIX asynchronous I/O will
114 * set this to the version of AIO that it implements. (Zero means
115 * that it is not implemented.) This value is used here by pathconf()
116 * and in kern_descrip.c by fpathconf().
117 */
118 int async_io_version;
119
120 /*
121 * Sync each mounted filesystem.
122 */
123 #ifndef _SYS_SYSPROTO_H_
124 struct sync_args {
125 int dummy;
126 };
127 #endif
128 /* ARGSUSED */
129 int
sys_sync(td,uap)130 sys_sync(td, uap)
131 struct thread *td;
132 struct sync_args *uap;
133 {
134 struct mount *mp, *nmp;
135 int save;
136
137 mtx_lock(&mountlist_mtx);
138 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
139 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
140 nmp = TAILQ_NEXT(mp, mnt_list);
141 continue;
142 }
143 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
144 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
145 save = curthread_pflags_set(TDP_SYNCIO);
146 vfs_msync(mp, MNT_NOWAIT);
147 VFS_SYNC(mp, MNT_NOWAIT);
148 curthread_pflags_restore(save);
149 vn_finished_write(mp);
150 }
151 mtx_lock(&mountlist_mtx);
152 nmp = TAILQ_NEXT(mp, mnt_list);
153 vfs_unbusy(mp);
154 }
155 mtx_unlock(&mountlist_mtx);
156 return (0);
157 }
158
159 /*
160 * Change filesystem quotas.
161 */
162 #ifndef _SYS_SYSPROTO_H_
163 struct quotactl_args {
164 char *path;
165 int cmd;
166 int uid;
167 caddr_t arg;
168 };
169 #endif
170 int
sys_quotactl(td,uap)171 sys_quotactl(td, uap)
172 struct thread *td;
173 register struct quotactl_args /* {
174 char *path;
175 int cmd;
176 int uid;
177 caddr_t arg;
178 } */ *uap;
179 {
180 struct mount *mp;
181 struct nameidata nd;
182 int error;
183
184 AUDIT_ARG_CMD(uap->cmd);
185 AUDIT_ARG_UID(uap->uid);
186 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
187 return (EPERM);
188 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
189 uap->path, td);
190 if ((error = namei(&nd)) != 0)
191 return (error);
192 NDFREE(&nd, NDF_ONLY_PNBUF);
193 mp = nd.ni_vp->v_mount;
194 vfs_ref(mp);
195 vput(nd.ni_vp);
196 error = vfs_busy(mp, 0);
197 vfs_rel(mp);
198 if (error != 0)
199 return (error);
200 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
201
202 /*
203 * Since quota on operation typically needs to open quota
204 * file, the Q_QUOTAON handler needs to unbusy the mount point
205 * before calling into namei. Otherwise, unmount might be
206 * started between two vfs_busy() invocations (first is our,
207 * second is from mount point cross-walk code in lookup()),
208 * causing deadlock.
209 *
210 * Require that Q_QUOTAON handles the vfs_busy() reference on
211 * its own, always returning with ubusied mount point.
212 */
213 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON)
214 vfs_unbusy(mp);
215 return (error);
216 }
217
218 /*
219 * Used by statfs conversion routines to scale the block size up if
220 * necessary so that all of the block counts are <= 'max_size'. Note
221 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
222 * value of 'n'.
223 */
224 void
statfs_scale_blocks(struct statfs * sf,long max_size)225 statfs_scale_blocks(struct statfs *sf, long max_size)
226 {
227 uint64_t count;
228 int shift;
229
230 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
231
232 /*
233 * Attempt to scale the block counts to give a more accurate
234 * overview to userland of the ratio of free space to used
235 * space. To do this, find the largest block count and compute
236 * a divisor that lets it fit into a signed integer <= max_size.
237 */
238 if (sf->f_bavail < 0)
239 count = -sf->f_bavail;
240 else
241 count = sf->f_bavail;
242 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
243 if (count <= max_size)
244 return;
245
246 count >>= flsl(max_size);
247 shift = 0;
248 while (count > 0) {
249 shift++;
250 count >>=1;
251 }
252
253 sf->f_bsize <<= shift;
254 sf->f_blocks >>= shift;
255 sf->f_bfree >>= shift;
256 sf->f_bavail >>= shift;
257 }
258
259 static int
kern_do_statfs(struct thread * td,struct mount * mp,struct statfs * buf)260 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
261 {
262 struct statfs *sp;
263 int error;
264
265 if (mp == NULL)
266 return (EBADF);
267 error = vfs_busy(mp, 0);
268 vfs_rel(mp);
269 if (error != 0)
270 return (error);
271 #ifdef MAC
272 error = mac_mount_check_stat(td->td_ucred, mp);
273 if (error != 0)
274 goto out;
275 #endif
276 /*
277 * Set these in case the underlying filesystem fails to do so.
278 */
279 sp = &mp->mnt_stat;
280 sp->f_version = STATFS_VERSION;
281 sp->f_namemax = NAME_MAX;
282 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
283 error = VFS_STATFS(mp, sp);
284 if (error != 0)
285 goto out;
286 *buf = *sp;
287 if (priv_check(td, PRIV_VFS_GENERATION)) {
288 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
289 prison_enforce_statfs(td->td_ucred, mp, buf);
290 }
291 out:
292 vfs_unbusy(mp);
293 return (error);
294 }
295
296 /*
297 * Get filesystem statistics.
298 */
299 #ifndef _SYS_SYSPROTO_H_
300 struct statfs_args {
301 char *path;
302 struct statfs *buf;
303 };
304 #endif
305 int
sys_statfs(td,uap)306 sys_statfs(td, uap)
307 struct thread *td;
308 register struct statfs_args /* {
309 char *path;
310 struct statfs *buf;
311 } */ *uap;
312 {
313 struct statfs sf;
314 int error;
315
316 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
317 if (error == 0)
318 error = copyout(&sf, uap->buf, sizeof(sf));
319 return (error);
320 }
321
322 int
kern_statfs(struct thread * td,char * path,enum uio_seg pathseg,struct statfs * buf)323 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
324 struct statfs *buf)
325 {
326 struct mount *mp;
327 struct nameidata nd;
328 int error;
329
330 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
331 pathseg, path, td);
332 error = namei(&nd);
333 if (error != 0)
334 return (error);
335 mp = nd.ni_vp->v_mount;
336 vfs_ref(mp);
337 NDFREE(&nd, NDF_ONLY_PNBUF);
338 vput(nd.ni_vp);
339 return (kern_do_statfs(td, mp, buf));
340 }
341
342 /*
343 * Get filesystem statistics.
344 */
345 #ifndef _SYS_SYSPROTO_H_
346 struct fstatfs_args {
347 int fd;
348 struct statfs *buf;
349 };
350 #endif
351 int
sys_fstatfs(td,uap)352 sys_fstatfs(td, uap)
353 struct thread *td;
354 register struct fstatfs_args /* {
355 int fd;
356 struct statfs *buf;
357 } */ *uap;
358 {
359 struct statfs sf;
360 int error;
361
362 error = kern_fstatfs(td, uap->fd, &sf);
363 if (error == 0)
364 error = copyout(&sf, uap->buf, sizeof(sf));
365 return (error);
366 }
367
368 int
kern_fstatfs(struct thread * td,int fd,struct statfs * buf)369 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
370 {
371 struct file *fp;
372 struct mount *mp;
373 struct vnode *vp;
374 cap_rights_t rights;
375 int error;
376
377 AUDIT_ARG_FD(fd);
378 error = getvnode(td->td_proc->p_fd, fd,
379 cap_rights_init(&rights, CAP_FSTATFS), &fp);
380 if (error != 0)
381 return (error);
382 vp = fp->f_vnode;
383 vn_lock(vp, LK_SHARED | LK_RETRY);
384 #ifdef AUDIT
385 AUDIT_ARG_VNODE1(vp);
386 #endif
387 mp = vp->v_mount;
388 if (mp != NULL)
389 vfs_ref(mp);
390 VOP_UNLOCK(vp, 0);
391 fdrop(fp, td);
392 return (kern_do_statfs(td, mp, buf));
393 }
394
395 /*
396 * Get statistics on all filesystems.
397 */
398 #ifndef _SYS_SYSPROTO_H_
399 struct getfsstat_args {
400 struct statfs *buf;
401 long bufsize;
402 int flags;
403 };
404 #endif
405 int
sys_getfsstat(td,uap)406 sys_getfsstat(td, uap)
407 struct thread *td;
408 register struct getfsstat_args /* {
409 struct statfs *buf;
410 long bufsize;
411 int flags;
412 } */ *uap;
413 {
414
415 return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE,
416 uap->flags));
417 }
418
419 /*
420 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
421 * The caller is responsible for freeing memory which will be allocated
422 * in '*buf'.
423 */
424 int
kern_getfsstat(struct thread * td,struct statfs ** buf,size_t bufsize,enum uio_seg bufseg,int flags)425 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
426 enum uio_seg bufseg, int flags)
427 {
428 struct mount *mp, *nmp;
429 struct statfs *sfsp, *sp, sb;
430 size_t count, maxcount;
431 int error;
432
433 maxcount = bufsize / sizeof(struct statfs);
434 if (bufsize == 0)
435 sfsp = NULL;
436 else if (bufseg == UIO_USERSPACE)
437 sfsp = *buf;
438 else /* if (bufseg == UIO_SYSSPACE) */ {
439 count = 0;
440 mtx_lock(&mountlist_mtx);
441 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
442 count++;
443 }
444 mtx_unlock(&mountlist_mtx);
445 if (maxcount > count)
446 maxcount = count;
447 sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP,
448 M_WAITOK);
449 }
450 count = 0;
451 mtx_lock(&mountlist_mtx);
452 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
453 if (prison_canseemount(td->td_ucred, mp) != 0) {
454 nmp = TAILQ_NEXT(mp, mnt_list);
455 continue;
456 }
457 #ifdef MAC
458 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
459 nmp = TAILQ_NEXT(mp, mnt_list);
460 continue;
461 }
462 #endif
463 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
464 nmp = TAILQ_NEXT(mp, mnt_list);
465 continue;
466 }
467 if (sfsp != NULL && count < maxcount) {
468 sp = &mp->mnt_stat;
469 /*
470 * Set these in case the underlying filesystem
471 * fails to do so.
472 */
473 sp->f_version = STATFS_VERSION;
474 sp->f_namemax = NAME_MAX;
475 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
476 /*
477 * If MNT_NOWAIT or MNT_LAZY is specified, do not
478 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
479 * overrides MNT_WAIT.
480 */
481 if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
482 (flags & MNT_WAIT)) &&
483 (error = VFS_STATFS(mp, sp))) {
484 mtx_lock(&mountlist_mtx);
485 nmp = TAILQ_NEXT(mp, mnt_list);
486 vfs_unbusy(mp);
487 continue;
488 }
489 if (priv_check(td, PRIV_VFS_GENERATION)) {
490 bcopy(sp, &sb, sizeof(sb));
491 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
492 prison_enforce_statfs(td->td_ucred, mp, &sb);
493 sp = &sb;
494 }
495 if (bufseg == UIO_SYSSPACE)
496 bcopy(sp, sfsp, sizeof(*sp));
497 else /* if (bufseg == UIO_USERSPACE) */ {
498 error = copyout(sp, sfsp, sizeof(*sp));
499 if (error != 0) {
500 vfs_unbusy(mp);
501 return (error);
502 }
503 }
504 sfsp++;
505 }
506 count++;
507 mtx_lock(&mountlist_mtx);
508 nmp = TAILQ_NEXT(mp, mnt_list);
509 vfs_unbusy(mp);
510 }
511 mtx_unlock(&mountlist_mtx);
512 if (sfsp != NULL && count > maxcount)
513 td->td_retval[0] = maxcount;
514 else
515 td->td_retval[0] = count;
516 return (0);
517 }
518
519 #ifdef COMPAT_FREEBSD4
520 /*
521 * Get old format filesystem statistics.
522 */
523 static void cvtstatfs(struct statfs *, struct ostatfs *);
524
525 #ifndef _SYS_SYSPROTO_H_
526 struct freebsd4_statfs_args {
527 char *path;
528 struct ostatfs *buf;
529 };
530 #endif
531 int
freebsd4_statfs(td,uap)532 freebsd4_statfs(td, uap)
533 struct thread *td;
534 struct freebsd4_statfs_args /* {
535 char *path;
536 struct ostatfs *buf;
537 } */ *uap;
538 {
539 struct ostatfs osb;
540 struct statfs sf;
541 int error;
542
543 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
544 if (error != 0)
545 return (error);
546 cvtstatfs(&sf, &osb);
547 return (copyout(&osb, uap->buf, sizeof(osb)));
548 }
549
550 /*
551 * Get filesystem statistics.
552 */
553 #ifndef _SYS_SYSPROTO_H_
554 struct freebsd4_fstatfs_args {
555 int fd;
556 struct ostatfs *buf;
557 };
558 #endif
559 int
freebsd4_fstatfs(td,uap)560 freebsd4_fstatfs(td, uap)
561 struct thread *td;
562 struct freebsd4_fstatfs_args /* {
563 int fd;
564 struct ostatfs *buf;
565 } */ *uap;
566 {
567 struct ostatfs osb;
568 struct statfs sf;
569 int error;
570
571 error = kern_fstatfs(td, uap->fd, &sf);
572 if (error != 0)
573 return (error);
574 cvtstatfs(&sf, &osb);
575 return (copyout(&osb, uap->buf, sizeof(osb)));
576 }
577
578 /*
579 * Get statistics on all filesystems.
580 */
581 #ifndef _SYS_SYSPROTO_H_
582 struct freebsd4_getfsstat_args {
583 struct ostatfs *buf;
584 long bufsize;
585 int flags;
586 };
587 #endif
588 int
freebsd4_getfsstat(td,uap)589 freebsd4_getfsstat(td, uap)
590 struct thread *td;
591 register struct freebsd4_getfsstat_args /* {
592 struct ostatfs *buf;
593 long bufsize;
594 int flags;
595 } */ *uap;
596 {
597 struct statfs *buf, *sp;
598 struct ostatfs osb;
599 size_t count, size;
600 int error;
601
602 count = uap->bufsize / sizeof(struct ostatfs);
603 size = count * sizeof(struct statfs);
604 error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags);
605 if (size > 0) {
606 count = td->td_retval[0];
607 sp = buf;
608 while (count > 0 && error == 0) {
609 cvtstatfs(sp, &osb);
610 error = copyout(&osb, uap->buf, sizeof(osb));
611 sp++;
612 uap->buf++;
613 count--;
614 }
615 free(buf, M_TEMP);
616 }
617 return (error);
618 }
619
620 /*
621 * Implement fstatfs() for (NFS) file handles.
622 */
623 #ifndef _SYS_SYSPROTO_H_
624 struct freebsd4_fhstatfs_args {
625 struct fhandle *u_fhp;
626 struct ostatfs *buf;
627 };
628 #endif
629 int
freebsd4_fhstatfs(td,uap)630 freebsd4_fhstatfs(td, uap)
631 struct thread *td;
632 struct freebsd4_fhstatfs_args /* {
633 struct fhandle *u_fhp;
634 struct ostatfs *buf;
635 } */ *uap;
636 {
637 struct ostatfs osb;
638 struct statfs sf;
639 fhandle_t fh;
640 int error;
641
642 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
643 if (error != 0)
644 return (error);
645 error = kern_fhstatfs(td, fh, &sf);
646 if (error != 0)
647 return (error);
648 cvtstatfs(&sf, &osb);
649 return (copyout(&osb, uap->buf, sizeof(osb)));
650 }
651
652 /*
653 * Convert a new format statfs structure to an old format statfs structure.
654 */
655 static void
cvtstatfs(nsp,osp)656 cvtstatfs(nsp, osp)
657 struct statfs *nsp;
658 struct ostatfs *osp;
659 {
660
661 statfs_scale_blocks(nsp, LONG_MAX);
662 bzero(osp, sizeof(*osp));
663 osp->f_bsize = nsp->f_bsize;
664 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
665 osp->f_blocks = nsp->f_blocks;
666 osp->f_bfree = nsp->f_bfree;
667 osp->f_bavail = nsp->f_bavail;
668 osp->f_files = MIN(nsp->f_files, LONG_MAX);
669 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
670 osp->f_owner = nsp->f_owner;
671 osp->f_type = nsp->f_type;
672 osp->f_flags = nsp->f_flags;
673 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
674 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
675 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
676 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
677 strlcpy(osp->f_fstypename, nsp->f_fstypename,
678 MIN(MFSNAMELEN, OMFSNAMELEN));
679 strlcpy(osp->f_mntonname, nsp->f_mntonname,
680 MIN(MNAMELEN, OMNAMELEN));
681 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
682 MIN(MNAMELEN, OMNAMELEN));
683 osp->f_fsid = nsp->f_fsid;
684 }
685 #endif /* COMPAT_FREEBSD4 */
686
687 /*
688 * Change current working directory to a given file descriptor.
689 */
690 #ifndef _SYS_SYSPROTO_H_
691 struct fchdir_args {
692 int fd;
693 };
694 #endif
695 int
sys_fchdir(td,uap)696 sys_fchdir(td, uap)
697 struct thread *td;
698 struct fchdir_args /* {
699 int fd;
700 } */ *uap;
701 {
702 register struct filedesc *fdp = td->td_proc->p_fd;
703 struct vnode *vp, *tdp, *vpold;
704 struct mount *mp;
705 struct file *fp;
706 cap_rights_t rights;
707 int error;
708
709 AUDIT_ARG_FD(uap->fd);
710 error = getvnode(fdp, uap->fd, cap_rights_init(&rights, CAP_FCHDIR),
711 &fp);
712 if (error != 0)
713 return (error);
714 vp = fp->f_vnode;
715 VREF(vp);
716 fdrop(fp, td);
717 vn_lock(vp, LK_SHARED | LK_RETRY);
718 AUDIT_ARG_VNODE1(vp);
719 error = change_dir(vp, td);
720 while (!error && (mp = vp->v_mountedhere) != NULL) {
721 if (vfs_busy(mp, 0))
722 continue;
723 error = VFS_ROOT(mp, LK_SHARED, &tdp);
724 vfs_unbusy(mp);
725 if (error != 0)
726 break;
727 vput(vp);
728 vp = tdp;
729 }
730 if (error != 0) {
731 vput(vp);
732 return (error);
733 }
734 VOP_UNLOCK(vp, 0);
735 FILEDESC_XLOCK(fdp);
736 vpold = fdp->fd_cdir;
737 fdp->fd_cdir = vp;
738 FILEDESC_XUNLOCK(fdp);
739 vrele(vpold);
740 return (0);
741 }
742
743 /*
744 * Change current working directory (``.'').
745 */
746 #ifndef _SYS_SYSPROTO_H_
747 struct chdir_args {
748 char *path;
749 };
750 #endif
751 int
sys_chdir(td,uap)752 sys_chdir(td, uap)
753 struct thread *td;
754 struct chdir_args /* {
755 char *path;
756 } */ *uap;
757 {
758
759 return (kern_chdir(td, uap->path, UIO_USERSPACE));
760 }
761
762 int
kern_chdir(struct thread * td,char * path,enum uio_seg pathseg)763 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
764 {
765 register struct filedesc *fdp = td->td_proc->p_fd;
766 struct nameidata nd;
767 struct vnode *vp;
768 int error;
769
770 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
771 pathseg, path, td);
772 if ((error = namei(&nd)) != 0)
773 return (error);
774 if ((error = change_dir(nd.ni_vp, td)) != 0) {
775 vput(nd.ni_vp);
776 NDFREE(&nd, NDF_ONLY_PNBUF);
777 return (error);
778 }
779 VOP_UNLOCK(nd.ni_vp, 0);
780 NDFREE(&nd, NDF_ONLY_PNBUF);
781 FILEDESC_XLOCK(fdp);
782 vp = fdp->fd_cdir;
783 fdp->fd_cdir = nd.ni_vp;
784 FILEDESC_XUNLOCK(fdp);
785 vrele(vp);
786 return (0);
787 }
788
789 /*
790 * Helper function for raised chroot(2) security function: Refuse if
791 * any filedescriptors are open directories.
792 */
793 static int
chroot_refuse_vdir_fds(fdp)794 chroot_refuse_vdir_fds(fdp)
795 struct filedesc *fdp;
796 {
797 struct vnode *vp;
798 struct file *fp;
799 int fd;
800
801 FILEDESC_LOCK_ASSERT(fdp);
802
803 for (fd = 0; fd <= fdp->fd_lastfile; fd++) {
804 fp = fget_locked(fdp, fd);
805 if (fp == NULL)
806 continue;
807 if (fp->f_type == DTYPE_VNODE) {
808 vp = fp->f_vnode;
809 if (vp->v_type == VDIR)
810 return (EPERM);
811 }
812 }
813 return (0);
814 }
815
816 /*
817 * This sysctl determines if we will allow a process to chroot(2) if it
818 * has a directory open:
819 * 0: disallowed for all processes.
820 * 1: allowed for processes that were not already chroot(2)'ed.
821 * 2: allowed for all processes.
822 */
823
824 static int chroot_allow_open_directories = 1;
825
826 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
827 &chroot_allow_open_directories, 0,
828 "Allow a process to chroot(2) if it has a directory open");
829
830 /*
831 * Change notion of root (``/'') directory.
832 */
833 #ifndef _SYS_SYSPROTO_H_
834 struct chroot_args {
835 char *path;
836 };
837 #endif
838 int
sys_chroot(td,uap)839 sys_chroot(td, uap)
840 struct thread *td;
841 struct chroot_args /* {
842 char *path;
843 } */ *uap;
844 {
845 struct nameidata nd;
846 int error;
847
848 error = priv_check(td, PRIV_VFS_CHROOT);
849 if (error != 0)
850 return (error);
851 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
852 UIO_USERSPACE, uap->path, td);
853 error = namei(&nd);
854 if (error != 0)
855 goto error;
856 error = change_dir(nd.ni_vp, td);
857 if (error != 0)
858 goto e_vunlock;
859 #ifdef MAC
860 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
861 if (error != 0)
862 goto e_vunlock;
863 #endif
864 VOP_UNLOCK(nd.ni_vp, 0);
865 error = change_root(nd.ni_vp, td);
866 vrele(nd.ni_vp);
867 NDFREE(&nd, NDF_ONLY_PNBUF);
868 return (error);
869 e_vunlock:
870 vput(nd.ni_vp);
871 error:
872 NDFREE(&nd, NDF_ONLY_PNBUF);
873 return (error);
874 }
875
876 /*
877 * Common routine for chroot and chdir. Callers must provide a locked vnode
878 * instance.
879 */
880 int
change_dir(vp,td)881 change_dir(vp, td)
882 struct vnode *vp;
883 struct thread *td;
884 {
885 #ifdef MAC
886 int error;
887 #endif
888
889 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
890 if (vp->v_type != VDIR)
891 return (ENOTDIR);
892 #ifdef MAC
893 error = mac_vnode_check_chdir(td->td_ucred, vp);
894 if (error != 0)
895 return (error);
896 #endif
897 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
898 }
899
900 /*
901 * Common routine for kern_chroot() and jail_attach(). The caller is
902 * responsible for invoking priv_check() and mac_vnode_check_chroot() to
903 * authorize this operation.
904 */
905 int
change_root(vp,td)906 change_root(vp, td)
907 struct vnode *vp;
908 struct thread *td;
909 {
910 struct filedesc *fdp;
911 struct vnode *oldvp;
912 int error;
913
914 fdp = td->td_proc->p_fd;
915 FILEDESC_XLOCK(fdp);
916 if (chroot_allow_open_directories == 0 ||
917 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
918 error = chroot_refuse_vdir_fds(fdp);
919 if (error != 0) {
920 FILEDESC_XUNLOCK(fdp);
921 return (error);
922 }
923 }
924 oldvp = fdp->fd_rdir;
925 fdp->fd_rdir = vp;
926 VREF(fdp->fd_rdir);
927 if (!fdp->fd_jdir) {
928 fdp->fd_jdir = vp;
929 VREF(fdp->fd_jdir);
930 }
931 FILEDESC_XUNLOCK(fdp);
932 vrele(oldvp);
933 return (0);
934 }
935
936 static __inline void
flags_to_rights(int flags,cap_rights_t * rightsp)937 flags_to_rights(int flags, cap_rights_t *rightsp)
938 {
939
940 if (flags & O_EXEC) {
941 cap_rights_set(rightsp, CAP_FEXECVE);
942 } else {
943 switch ((flags & O_ACCMODE)) {
944 case O_RDONLY:
945 cap_rights_set(rightsp, CAP_READ);
946 break;
947 case O_RDWR:
948 cap_rights_set(rightsp, CAP_READ);
949 /* FALLTHROUGH */
950 case O_WRONLY:
951 cap_rights_set(rightsp, CAP_WRITE);
952 if (!(flags & (O_APPEND | O_TRUNC)))
953 cap_rights_set(rightsp, CAP_SEEK);
954 break;
955 }
956 }
957
958 if (flags & O_CREAT)
959 cap_rights_set(rightsp, CAP_CREATE);
960
961 if (flags & O_TRUNC)
962 cap_rights_set(rightsp, CAP_FTRUNCATE);
963
964 if (flags & (O_SYNC | O_FSYNC))
965 cap_rights_set(rightsp, CAP_FSYNC);
966
967 if (flags & (O_EXLOCK | O_SHLOCK))
968 cap_rights_set(rightsp, CAP_FLOCK);
969 }
970
971 /*
972 * Check permissions, allocate an open file structure, and call the device
973 * open routine if any.
974 */
975 #ifndef _SYS_SYSPROTO_H_
976 struct open_args {
977 char *path;
978 int flags;
979 int mode;
980 };
981 #endif
982 int
sys_open(td,uap)983 sys_open(td, uap)
984 struct thread *td;
985 register struct open_args /* {
986 char *path;
987 int flags;
988 int mode;
989 } */ *uap;
990 {
991
992 return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
993 }
994
995 #ifndef _SYS_SYSPROTO_H_
996 struct openat_args {
997 int fd;
998 char *path;
999 int flag;
1000 int mode;
1001 };
1002 #endif
1003 int
sys_openat(struct thread * td,struct openat_args * uap)1004 sys_openat(struct thread *td, struct openat_args *uap)
1005 {
1006
1007 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1008 uap->mode));
1009 }
1010
1011 int
kern_open(struct thread * td,char * path,enum uio_seg pathseg,int flags,int mode)1012 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
1013 int mode)
1014 {
1015
1016 return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode));
1017 }
1018
1019 int
kern_openat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int flags,int mode)1020 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1021 int flags, int mode)
1022 {
1023 struct proc *p = td->td_proc;
1024 struct filedesc *fdp = p->p_fd;
1025 struct file *fp;
1026 struct vnode *vp;
1027 struct nameidata nd;
1028 cap_rights_t rights;
1029 int cmode, error, indx;
1030
1031 indx = -1;
1032
1033 AUDIT_ARG_FFLAGS(flags);
1034 AUDIT_ARG_MODE(mode);
1035 /* XXX: audit dirfd */
1036 cap_rights_init(&rights, CAP_LOOKUP);
1037 flags_to_rights(flags, &rights);
1038 /*
1039 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1040 * may be specified.
1041 */
1042 if (flags & O_EXEC) {
1043 if (flags & O_ACCMODE)
1044 return (EINVAL);
1045 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1046 return (EINVAL);
1047 } else {
1048 flags = FFLAGS(flags);
1049 }
1050
1051 /*
1052 * Allocate the file descriptor, but don't install a descriptor yet.
1053 */
1054 error = falloc_noinstall(td, &fp);
1055 if (error != 0)
1056 return (error);
1057 /*
1058 * An extra reference on `fp' has been held for us by
1059 * falloc_noinstall().
1060 */
1061 /* Set the flags early so the finit in devfs can pick them up. */
1062 fp->f_flag = flags & FMASK;
1063 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
1064 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
1065 &rights, td);
1066 td->td_dupfd = -1; /* XXX check for fdopen */
1067 error = vn_open(&nd, &flags, cmode, fp);
1068 if (error != 0) {
1069 /*
1070 * If the vn_open replaced the method vector, something
1071 * wonderous happened deep below and we just pass it up
1072 * pretending we know what we do.
1073 */
1074 if (error == ENXIO && fp->f_ops != &badfileops)
1075 goto success;
1076
1077 /*
1078 * Handle special fdopen() case. bleh.
1079 *
1080 * Don't do this for relative (capability) lookups; we don't
1081 * understand exactly what would happen, and we don't think
1082 * that it ever should.
1083 */
1084 if (nd.ni_strictrelative == 0 &&
1085 (error == ENODEV || error == ENXIO) &&
1086 td->td_dupfd >= 0) {
1087 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1088 &indx);
1089 if (error == 0)
1090 goto success;
1091 }
1092
1093 goto bad;
1094 }
1095 td->td_dupfd = 0;
1096 NDFREE(&nd, NDF_ONLY_PNBUF);
1097 vp = nd.ni_vp;
1098
1099 /*
1100 * Store the vnode, for any f_type. Typically, the vnode use
1101 * count is decremented by direct call to vn_closefile() for
1102 * files that switched type in the cdevsw fdopen() method.
1103 */
1104 fp->f_vnode = vp;
1105 /*
1106 * If the file wasn't claimed by devfs bind it to the normal
1107 * vnode operations here.
1108 */
1109 if (fp->f_ops == &badfileops) {
1110 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
1111 fp->f_seqcount = 1;
1112 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK),
1113 DTYPE_VNODE, vp, &vnops);
1114 }
1115
1116 VOP_UNLOCK(vp, 0);
1117 if (flags & O_TRUNC) {
1118 error = fo_truncate(fp, 0, td->td_ucred, td);
1119 if (error != 0)
1120 goto bad;
1121 }
1122 success:
1123 /*
1124 * If we haven't already installed the FD (for dupfdopen), do so now.
1125 */
1126 if (indx == -1) {
1127 struct filecaps *fcaps;
1128
1129 #ifdef CAPABILITIES
1130 if (nd.ni_strictrelative == 1)
1131 fcaps = &nd.ni_filecaps;
1132 else
1133 #endif
1134 fcaps = NULL;
1135 error = finstall(td, fp, &indx, flags, fcaps);
1136 /* On success finstall() consumes fcaps. */
1137 if (error != 0) {
1138 filecaps_free(&nd.ni_filecaps);
1139 goto bad;
1140 }
1141 } else {
1142 filecaps_free(&nd.ni_filecaps);
1143 }
1144
1145 /*
1146 * Release our private reference, leaving the one associated with
1147 * the descriptor table intact.
1148 */
1149 fdrop(fp, td);
1150 td->td_retval[0] = indx;
1151 return (0);
1152 bad:
1153 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1154 fdrop(fp, td);
1155 return (error);
1156 }
1157
1158 #ifdef COMPAT_43
1159 /*
1160 * Create a file.
1161 */
1162 #ifndef _SYS_SYSPROTO_H_
1163 struct ocreat_args {
1164 char *path;
1165 int mode;
1166 };
1167 #endif
1168 int
ocreat(td,uap)1169 ocreat(td, uap)
1170 struct thread *td;
1171 register struct ocreat_args /* {
1172 char *path;
1173 int mode;
1174 } */ *uap;
1175 {
1176
1177 return (kern_open(td, uap->path, UIO_USERSPACE,
1178 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1179 }
1180 #endif /* COMPAT_43 */
1181
1182 /*
1183 * Create a special file.
1184 */
1185 #ifndef _SYS_SYSPROTO_H_
1186 struct mknod_args {
1187 char *path;
1188 int mode;
1189 int dev;
1190 };
1191 #endif
1192 int
sys_mknod(td,uap)1193 sys_mknod(td, uap)
1194 struct thread *td;
1195 register struct mknod_args /* {
1196 char *path;
1197 int mode;
1198 int dev;
1199 } */ *uap;
1200 {
1201
1202 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
1203 }
1204
1205 #ifndef _SYS_SYSPROTO_H_
1206 struct mknodat_args {
1207 int fd;
1208 char *path;
1209 mode_t mode;
1210 dev_t dev;
1211 };
1212 #endif
1213 int
sys_mknodat(struct thread * td,struct mknodat_args * uap)1214 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1215 {
1216
1217 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1218 uap->dev));
1219 }
1220
1221 int
kern_mknod(struct thread * td,char * path,enum uio_seg pathseg,int mode,int dev)1222 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
1223 int dev)
1224 {
1225
1226 return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev));
1227 }
1228
1229 int
kern_mknodat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int mode,int dev)1230 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1231 int mode, int dev)
1232 {
1233 struct vnode *vp;
1234 struct mount *mp;
1235 struct vattr vattr;
1236 struct nameidata nd;
1237 cap_rights_t rights;
1238 int error, whiteout = 0;
1239
1240 AUDIT_ARG_MODE(mode);
1241 AUDIT_ARG_DEV(dev);
1242 switch (mode & S_IFMT) {
1243 case S_IFCHR:
1244 case S_IFBLK:
1245 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1246 if (error == 0 && dev == VNOVAL)
1247 error = EINVAL;
1248 break;
1249 case S_IFWHT:
1250 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1251 break;
1252 case S_IFIFO:
1253 if (dev == 0)
1254 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1255 /* FALLTHROUGH */
1256 default:
1257 error = EINVAL;
1258 break;
1259 }
1260 if (error != 0)
1261 return (error);
1262 restart:
1263 bwillwrite();
1264 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1265 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKNODAT),
1266 td);
1267 if ((error = namei(&nd)) != 0)
1268 return (error);
1269 vp = nd.ni_vp;
1270 if (vp != NULL) {
1271 NDFREE(&nd, NDF_ONLY_PNBUF);
1272 if (vp == nd.ni_dvp)
1273 vrele(nd.ni_dvp);
1274 else
1275 vput(nd.ni_dvp);
1276 vrele(vp);
1277 return (EEXIST);
1278 } else {
1279 VATTR_NULL(&vattr);
1280 vattr.va_mode = (mode & ALLPERMS) &
1281 ~td->td_proc->p_fd->fd_cmask;
1282 vattr.va_rdev = dev;
1283 whiteout = 0;
1284
1285 switch (mode & S_IFMT) {
1286 case S_IFCHR:
1287 vattr.va_type = VCHR;
1288 break;
1289 case S_IFBLK:
1290 vattr.va_type = VBLK;
1291 break;
1292 case S_IFWHT:
1293 whiteout = 1;
1294 break;
1295 default:
1296 panic("kern_mknod: invalid mode");
1297 }
1298 }
1299 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1300 NDFREE(&nd, NDF_ONLY_PNBUF);
1301 vput(nd.ni_dvp);
1302 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1303 return (error);
1304 goto restart;
1305 }
1306 #ifdef MAC
1307 if (error == 0 && !whiteout)
1308 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1309 &nd.ni_cnd, &vattr);
1310 #endif
1311 if (error == 0) {
1312 if (whiteout)
1313 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1314 else {
1315 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1316 &nd.ni_cnd, &vattr);
1317 if (error == 0)
1318 vput(nd.ni_vp);
1319 }
1320 }
1321 NDFREE(&nd, NDF_ONLY_PNBUF);
1322 vput(nd.ni_dvp);
1323 vn_finished_write(mp);
1324 return (error);
1325 }
1326
1327 /*
1328 * Create a named pipe.
1329 */
1330 #ifndef _SYS_SYSPROTO_H_
1331 struct mkfifo_args {
1332 char *path;
1333 int mode;
1334 };
1335 #endif
1336 int
sys_mkfifo(td,uap)1337 sys_mkfifo(td, uap)
1338 struct thread *td;
1339 register struct mkfifo_args /* {
1340 char *path;
1341 int mode;
1342 } */ *uap;
1343 {
1344
1345 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
1346 }
1347
1348 #ifndef _SYS_SYSPROTO_H_
1349 struct mkfifoat_args {
1350 int fd;
1351 char *path;
1352 mode_t mode;
1353 };
1354 #endif
1355 int
sys_mkfifoat(struct thread * td,struct mkfifoat_args * uap)1356 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1357 {
1358
1359 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1360 uap->mode));
1361 }
1362
1363 int
kern_mkfifo(struct thread * td,char * path,enum uio_seg pathseg,int mode)1364 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
1365 {
1366
1367 return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode));
1368 }
1369
1370 int
kern_mkfifoat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int mode)1371 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1372 int mode)
1373 {
1374 struct mount *mp;
1375 struct vattr vattr;
1376 struct nameidata nd;
1377 cap_rights_t rights;
1378 int error;
1379
1380 AUDIT_ARG_MODE(mode);
1381 restart:
1382 bwillwrite();
1383 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1384 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKFIFOAT),
1385 td);
1386 if ((error = namei(&nd)) != 0)
1387 return (error);
1388 if (nd.ni_vp != NULL) {
1389 NDFREE(&nd, NDF_ONLY_PNBUF);
1390 if (nd.ni_vp == nd.ni_dvp)
1391 vrele(nd.ni_dvp);
1392 else
1393 vput(nd.ni_dvp);
1394 vrele(nd.ni_vp);
1395 return (EEXIST);
1396 }
1397 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1398 NDFREE(&nd, NDF_ONLY_PNBUF);
1399 vput(nd.ni_dvp);
1400 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1401 return (error);
1402 goto restart;
1403 }
1404 VATTR_NULL(&vattr);
1405 vattr.va_type = VFIFO;
1406 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1407 #ifdef MAC
1408 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1409 &vattr);
1410 if (error != 0)
1411 goto out;
1412 #endif
1413 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1414 if (error == 0)
1415 vput(nd.ni_vp);
1416 #ifdef MAC
1417 out:
1418 #endif
1419 vput(nd.ni_dvp);
1420 vn_finished_write(mp);
1421 NDFREE(&nd, NDF_ONLY_PNBUF);
1422 return (error);
1423 }
1424
1425 /*
1426 * Make a hard file link.
1427 */
1428 #ifndef _SYS_SYSPROTO_H_
1429 struct link_args {
1430 char *path;
1431 char *link;
1432 };
1433 #endif
1434 int
sys_link(td,uap)1435 sys_link(td, uap)
1436 struct thread *td;
1437 register struct link_args /* {
1438 char *path;
1439 char *link;
1440 } */ *uap;
1441 {
1442
1443 return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
1444 }
1445
1446 #ifndef _SYS_SYSPROTO_H_
1447 struct linkat_args {
1448 int fd1;
1449 char *path1;
1450 int fd2;
1451 char *path2;
1452 int flag;
1453 };
1454 #endif
1455 int
sys_linkat(struct thread * td,struct linkat_args * uap)1456 sys_linkat(struct thread *td, struct linkat_args *uap)
1457 {
1458 int flag;
1459
1460 flag = uap->flag;
1461 if (flag & ~AT_SYMLINK_FOLLOW)
1462 return (EINVAL);
1463
1464 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1465 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1466 }
1467
1468 int hardlink_check_uid = 0;
1469 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1470 &hardlink_check_uid, 0,
1471 "Unprivileged processes cannot create hard links to files owned by other "
1472 "users");
1473 static int hardlink_check_gid = 0;
1474 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1475 &hardlink_check_gid, 0,
1476 "Unprivileged processes cannot create hard links to files owned by other "
1477 "groups");
1478
1479 static int
can_hardlink(struct vnode * vp,struct ucred * cred)1480 can_hardlink(struct vnode *vp, struct ucred *cred)
1481 {
1482 struct vattr va;
1483 int error;
1484
1485 if (!hardlink_check_uid && !hardlink_check_gid)
1486 return (0);
1487
1488 error = VOP_GETATTR(vp, &va, cred);
1489 if (error != 0)
1490 return (error);
1491
1492 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1493 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1494 if (error != 0)
1495 return (error);
1496 }
1497
1498 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1499 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1500 if (error != 0)
1501 return (error);
1502 }
1503
1504 return (0);
1505 }
1506
1507 int
kern_link(struct thread * td,char * path,char * link,enum uio_seg segflg)1508 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
1509 {
1510
1511 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW));
1512 }
1513
1514 int
kern_linkat(struct thread * td,int fd1,int fd2,char * path1,char * path2,enum uio_seg segflg,int follow)1515 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1516 enum uio_seg segflg, int follow)
1517 {
1518 struct vnode *vp;
1519 struct mount *mp;
1520 struct nameidata nd;
1521 cap_rights_t rights;
1522 int error;
1523
1524 again:
1525 bwillwrite();
1526 NDINIT_AT(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1, td);
1527
1528 if ((error = namei(&nd)) != 0)
1529 return (error);
1530 NDFREE(&nd, NDF_ONLY_PNBUF);
1531 vp = nd.ni_vp;
1532 if (vp->v_type == VDIR) {
1533 vrele(vp);
1534 return (EPERM); /* POSIX */
1535 }
1536 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE2 |
1537 NOCACHE, segflg, path2, fd2, cap_rights_init(&rights, CAP_LINKAT),
1538 td);
1539 if ((error = namei(&nd)) == 0) {
1540 if (nd.ni_vp != NULL) {
1541 NDFREE(&nd, NDF_ONLY_PNBUF);
1542 if (nd.ni_dvp == nd.ni_vp)
1543 vrele(nd.ni_dvp);
1544 else
1545 vput(nd.ni_dvp);
1546 vrele(nd.ni_vp);
1547 vrele(vp);
1548 return (EEXIST);
1549 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1550 /*
1551 * Cross-device link. No need to recheck
1552 * vp->v_type, since it cannot change, except
1553 * to VBAD.
1554 */
1555 NDFREE(&nd, NDF_ONLY_PNBUF);
1556 vput(nd.ni_dvp);
1557 vrele(vp);
1558 return (EXDEV);
1559 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
1560 error = can_hardlink(vp, td->td_ucred);
1561 #ifdef MAC
1562 if (error == 0)
1563 error = mac_vnode_check_link(td->td_ucred,
1564 nd.ni_dvp, vp, &nd.ni_cnd);
1565 #endif
1566 if (error != 0) {
1567 vput(vp);
1568 vput(nd.ni_dvp);
1569 NDFREE(&nd, NDF_ONLY_PNBUF);
1570 return (error);
1571 }
1572 error = vn_start_write(vp, &mp, V_NOWAIT);
1573 if (error != 0) {
1574 vput(vp);
1575 vput(nd.ni_dvp);
1576 NDFREE(&nd, NDF_ONLY_PNBUF);
1577 error = vn_start_write(NULL, &mp,
1578 V_XSLEEP | PCATCH);
1579 if (error != 0)
1580 return (error);
1581 goto again;
1582 }
1583 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1584 VOP_UNLOCK(vp, 0);
1585 vput(nd.ni_dvp);
1586 vn_finished_write(mp);
1587 NDFREE(&nd, NDF_ONLY_PNBUF);
1588 } else {
1589 vput(nd.ni_dvp);
1590 NDFREE(&nd, NDF_ONLY_PNBUF);
1591 vrele(vp);
1592 goto again;
1593 }
1594 }
1595 vrele(vp);
1596 return (error);
1597 }
1598
1599 /*
1600 * Make a symbolic link.
1601 */
1602 #ifndef _SYS_SYSPROTO_H_
1603 struct symlink_args {
1604 char *path;
1605 char *link;
1606 };
1607 #endif
1608 int
sys_symlink(td,uap)1609 sys_symlink(td, uap)
1610 struct thread *td;
1611 register struct symlink_args /* {
1612 char *path;
1613 char *link;
1614 } */ *uap;
1615 {
1616
1617 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
1618 }
1619
1620 #ifndef _SYS_SYSPROTO_H_
1621 struct symlinkat_args {
1622 char *path;
1623 int fd;
1624 char *path2;
1625 };
1626 #endif
1627 int
sys_symlinkat(struct thread * td,struct symlinkat_args * uap)1628 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1629 {
1630
1631 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1632 UIO_USERSPACE));
1633 }
1634
1635 int
kern_symlink(struct thread * td,char * path,char * link,enum uio_seg segflg)1636 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
1637 {
1638
1639 return (kern_symlinkat(td, path, AT_FDCWD, link, segflg));
1640 }
1641
1642 int
kern_symlinkat(struct thread * td,char * path1,int fd,char * path2,enum uio_seg segflg)1643 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1644 enum uio_seg segflg)
1645 {
1646 struct mount *mp;
1647 struct vattr vattr;
1648 char *syspath;
1649 struct nameidata nd;
1650 int error;
1651 cap_rights_t rights;
1652
1653 if (segflg == UIO_SYSSPACE) {
1654 syspath = path1;
1655 } else {
1656 syspath = uma_zalloc(namei_zone, M_WAITOK);
1657 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1658 goto out;
1659 }
1660 AUDIT_ARG_TEXT(syspath);
1661 restart:
1662 bwillwrite();
1663 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1664 NOCACHE, segflg, path2, fd, cap_rights_init(&rights, CAP_SYMLINKAT),
1665 td);
1666 if ((error = namei(&nd)) != 0)
1667 goto out;
1668 if (nd.ni_vp) {
1669 NDFREE(&nd, NDF_ONLY_PNBUF);
1670 if (nd.ni_vp == nd.ni_dvp)
1671 vrele(nd.ni_dvp);
1672 else
1673 vput(nd.ni_dvp);
1674 vrele(nd.ni_vp);
1675 error = EEXIST;
1676 goto out;
1677 }
1678 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1679 NDFREE(&nd, NDF_ONLY_PNBUF);
1680 vput(nd.ni_dvp);
1681 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1682 goto out;
1683 goto restart;
1684 }
1685 VATTR_NULL(&vattr);
1686 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1687 #ifdef MAC
1688 vattr.va_type = VLNK;
1689 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1690 &vattr);
1691 if (error != 0)
1692 goto out2;
1693 #endif
1694 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1695 if (error == 0)
1696 vput(nd.ni_vp);
1697 #ifdef MAC
1698 out2:
1699 #endif
1700 NDFREE(&nd, NDF_ONLY_PNBUF);
1701 vput(nd.ni_dvp);
1702 vn_finished_write(mp);
1703 out:
1704 if (segflg != UIO_SYSSPACE)
1705 uma_zfree(namei_zone, syspath);
1706 return (error);
1707 }
1708
1709 /*
1710 * Delete a whiteout from the filesystem.
1711 */
1712 int
sys_undelete(td,uap)1713 sys_undelete(td, uap)
1714 struct thread *td;
1715 register struct undelete_args /* {
1716 char *path;
1717 } */ *uap;
1718 {
1719 struct mount *mp;
1720 struct nameidata nd;
1721 int error;
1722
1723 restart:
1724 bwillwrite();
1725 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1726 UIO_USERSPACE, uap->path, td);
1727 error = namei(&nd);
1728 if (error != 0)
1729 return (error);
1730
1731 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1732 NDFREE(&nd, NDF_ONLY_PNBUF);
1733 if (nd.ni_vp == nd.ni_dvp)
1734 vrele(nd.ni_dvp);
1735 else
1736 vput(nd.ni_dvp);
1737 if (nd.ni_vp)
1738 vrele(nd.ni_vp);
1739 return (EEXIST);
1740 }
1741 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1742 NDFREE(&nd, NDF_ONLY_PNBUF);
1743 vput(nd.ni_dvp);
1744 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1745 return (error);
1746 goto restart;
1747 }
1748 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1749 NDFREE(&nd, NDF_ONLY_PNBUF);
1750 vput(nd.ni_dvp);
1751 vn_finished_write(mp);
1752 return (error);
1753 }
1754
1755 /*
1756 * Delete a name from the filesystem.
1757 */
1758 #ifndef _SYS_SYSPROTO_H_
1759 struct unlink_args {
1760 char *path;
1761 };
1762 #endif
1763 int
sys_unlink(td,uap)1764 sys_unlink(td, uap)
1765 struct thread *td;
1766 struct unlink_args /* {
1767 char *path;
1768 } */ *uap;
1769 {
1770
1771 return (kern_unlink(td, uap->path, UIO_USERSPACE));
1772 }
1773
1774 #ifndef _SYS_SYSPROTO_H_
1775 struct unlinkat_args {
1776 int fd;
1777 char *path;
1778 int flag;
1779 };
1780 #endif
1781 int
sys_unlinkat(struct thread * td,struct unlinkat_args * uap)1782 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1783 {
1784 int flag = uap->flag;
1785 int fd = uap->fd;
1786 char *path = uap->path;
1787
1788 if (flag & ~AT_REMOVEDIR)
1789 return (EINVAL);
1790
1791 if (flag & AT_REMOVEDIR)
1792 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1793 else
1794 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0));
1795 }
1796
1797 int
kern_unlink(struct thread * td,char * path,enum uio_seg pathseg)1798 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
1799 {
1800
1801 return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0));
1802 }
1803
1804 int
kern_unlinkat(struct thread * td,int fd,char * path,enum uio_seg pathseg,ino_t oldinum)1805 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1806 ino_t oldinum)
1807 {
1808 struct mount *mp;
1809 struct vnode *vp;
1810 struct nameidata nd;
1811 struct stat sb;
1812 cap_rights_t rights;
1813 int error;
1814
1815 restart:
1816 bwillwrite();
1817 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
1818 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
1819 if ((error = namei(&nd)) != 0)
1820 return (error == EINVAL ? EPERM : error);
1821 vp = nd.ni_vp;
1822 if (vp->v_type == VDIR && oldinum == 0) {
1823 error = EPERM; /* POSIX */
1824 } else if (oldinum != 0 &&
1825 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1826 sb.st_ino != oldinum) {
1827 error = EIDRM; /* Identifier removed */
1828 } else {
1829 /*
1830 * The root of a mounted filesystem cannot be deleted.
1831 *
1832 * XXX: can this only be a VDIR case?
1833 */
1834 if (vp->v_vflag & VV_ROOT)
1835 error = EBUSY;
1836 }
1837 if (error == 0) {
1838 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1839 NDFREE(&nd, NDF_ONLY_PNBUF);
1840 vput(nd.ni_dvp);
1841 if (vp == nd.ni_dvp)
1842 vrele(vp);
1843 else
1844 vput(vp);
1845 if ((error = vn_start_write(NULL, &mp,
1846 V_XSLEEP | PCATCH)) != 0)
1847 return (error);
1848 goto restart;
1849 }
1850 #ifdef MAC
1851 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1852 &nd.ni_cnd);
1853 if (error != 0)
1854 goto out;
1855 #endif
1856 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1857 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1858 #ifdef MAC
1859 out:
1860 #endif
1861 vn_finished_write(mp);
1862 }
1863 NDFREE(&nd, NDF_ONLY_PNBUF);
1864 vput(nd.ni_dvp);
1865 if (vp == nd.ni_dvp)
1866 vrele(vp);
1867 else
1868 vput(vp);
1869 return (error);
1870 }
1871
1872 /*
1873 * Reposition read/write file offset.
1874 */
1875 #ifndef _SYS_SYSPROTO_H_
1876 struct lseek_args {
1877 int fd;
1878 int pad;
1879 off_t offset;
1880 int whence;
1881 };
1882 #endif
1883 int
sys_lseek(td,uap)1884 sys_lseek(td, uap)
1885 struct thread *td;
1886 register struct lseek_args /* {
1887 int fd;
1888 int pad;
1889 off_t offset;
1890 int whence;
1891 } */ *uap;
1892 {
1893 struct file *fp;
1894 cap_rights_t rights;
1895 int error;
1896
1897 AUDIT_ARG_FD(uap->fd);
1898 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_SEEK), &fp);
1899 if (error != 0)
1900 return (error);
1901 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
1902 fo_seek(fp, uap->offset, uap->whence, td) : ESPIPE;
1903 fdrop(fp, td);
1904 return (error);
1905 }
1906
1907 #if defined(COMPAT_43)
1908 /*
1909 * Reposition read/write file offset.
1910 */
1911 #ifndef _SYS_SYSPROTO_H_
1912 struct olseek_args {
1913 int fd;
1914 long offset;
1915 int whence;
1916 };
1917 #endif
1918 int
olseek(td,uap)1919 olseek(td, uap)
1920 struct thread *td;
1921 register struct olseek_args /* {
1922 int fd;
1923 long offset;
1924 int whence;
1925 } */ *uap;
1926 {
1927 struct lseek_args /* {
1928 int fd;
1929 int pad;
1930 off_t offset;
1931 int whence;
1932 } */ nuap;
1933
1934 nuap.fd = uap->fd;
1935 nuap.offset = uap->offset;
1936 nuap.whence = uap->whence;
1937 return (sys_lseek(td, &nuap));
1938 }
1939 #endif /* COMPAT_43 */
1940
1941 /* Version with the 'pad' argument */
1942 int
freebsd6_lseek(td,uap)1943 freebsd6_lseek(td, uap)
1944 struct thread *td;
1945 register struct freebsd6_lseek_args *uap;
1946 {
1947 struct lseek_args ouap;
1948
1949 ouap.fd = uap->fd;
1950 ouap.offset = uap->offset;
1951 ouap.whence = uap->whence;
1952 return (sys_lseek(td, &ouap));
1953 }
1954
1955 /*
1956 * Check access permissions using passed credentials.
1957 */
1958 static int
vn_access(vp,user_flags,cred,td)1959 vn_access(vp, user_flags, cred, td)
1960 struct vnode *vp;
1961 int user_flags;
1962 struct ucred *cred;
1963 struct thread *td;
1964 {
1965 accmode_t accmode;
1966 int error;
1967
1968 /* Flags == 0 means only check for existence. */
1969 error = 0;
1970 if (user_flags) {
1971 accmode = 0;
1972 if (user_flags & R_OK)
1973 accmode |= VREAD;
1974 if (user_flags & W_OK)
1975 accmode |= VWRITE;
1976 if (user_flags & X_OK)
1977 accmode |= VEXEC;
1978 #ifdef MAC
1979 error = mac_vnode_check_access(cred, vp, accmode);
1980 if (error != 0)
1981 return (error);
1982 #endif
1983 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
1984 error = VOP_ACCESS(vp, accmode, cred, td);
1985 }
1986 return (error);
1987 }
1988
1989 /*
1990 * Check access permissions using "real" credentials.
1991 */
1992 #ifndef _SYS_SYSPROTO_H_
1993 struct access_args {
1994 char *path;
1995 int amode;
1996 };
1997 #endif
1998 int
sys_access(td,uap)1999 sys_access(td, uap)
2000 struct thread *td;
2001 register struct access_args /* {
2002 char *path;
2003 int amode;
2004 } */ *uap;
2005 {
2006
2007 return (kern_access(td, uap->path, UIO_USERSPACE, uap->amode));
2008 }
2009
2010 #ifndef _SYS_SYSPROTO_H_
2011 struct faccessat_args {
2012 int dirfd;
2013 char *path;
2014 int amode;
2015 int flag;
2016 }
2017 #endif
2018 int
sys_faccessat(struct thread * td,struct faccessat_args * uap)2019 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2020 {
2021
2022 if (uap->flag & ~AT_EACCESS)
2023 return (EINVAL);
2024 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2025 uap->amode));
2026 }
2027
2028 int
kern_access(struct thread * td,char * path,enum uio_seg pathseg,int amode)2029 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int amode)
2030 {
2031
2032 return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, amode));
2033 }
2034
2035 int
kern_accessat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int flag,int amode)2036 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2037 int flag, int amode)
2038 {
2039 struct ucred *cred, *tmpcred;
2040 struct vnode *vp;
2041 struct nameidata nd;
2042 cap_rights_t rights;
2043 int error;
2044
2045 /*
2046 * Create and modify a temporary credential instead of one that
2047 * is potentially shared.
2048 */
2049 if (!(flag & AT_EACCESS)) {
2050 cred = td->td_ucred;
2051 tmpcred = crdup(cred);
2052 tmpcred->cr_uid = cred->cr_ruid;
2053 tmpcred->cr_groups[0] = cred->cr_rgid;
2054 td->td_ucred = tmpcred;
2055 } else
2056 cred = tmpcred = td->td_ucred;
2057 AUDIT_ARG_VALUE(amode);
2058 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
2059 AUDITVNODE1, pathseg, path, fd, cap_rights_init(&rights, CAP_FSTAT),
2060 td);
2061 if ((error = namei(&nd)) != 0)
2062 goto out1;
2063 vp = nd.ni_vp;
2064
2065 error = vn_access(vp, amode, tmpcred, td);
2066 NDFREE(&nd, NDF_ONLY_PNBUF);
2067 vput(vp);
2068 out1:
2069 if (!(flag & AT_EACCESS)) {
2070 td->td_ucred = cred;
2071 crfree(tmpcred);
2072 }
2073 return (error);
2074 }
2075
2076 /*
2077 * Check access permissions using "effective" credentials.
2078 */
2079 #ifndef _SYS_SYSPROTO_H_
2080 struct eaccess_args {
2081 char *path;
2082 int amode;
2083 };
2084 #endif
2085 int
sys_eaccess(td,uap)2086 sys_eaccess(td, uap)
2087 struct thread *td;
2088 register struct eaccess_args /* {
2089 char *path;
2090 int amode;
2091 } */ *uap;
2092 {
2093
2094 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->amode));
2095 }
2096
2097 int
kern_eaccess(struct thread * td,char * path,enum uio_seg pathseg,int amode)2098 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int amode)
2099 {
2100
2101 return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, amode));
2102 }
2103
2104 #if defined(COMPAT_43)
2105 /*
2106 * Get file status; this version follows links.
2107 */
2108 #ifndef _SYS_SYSPROTO_H_
2109 struct ostat_args {
2110 char *path;
2111 struct ostat *ub;
2112 };
2113 #endif
2114 int
ostat(td,uap)2115 ostat(td, uap)
2116 struct thread *td;
2117 register struct ostat_args /* {
2118 char *path;
2119 struct ostat *ub;
2120 } */ *uap;
2121 {
2122 struct stat sb;
2123 struct ostat osb;
2124 int error;
2125
2126 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2127 if (error != 0)
2128 return (error);
2129 cvtstat(&sb, &osb);
2130 return (copyout(&osb, uap->ub, sizeof (osb)));
2131 }
2132
2133 /*
2134 * Get file status; this version does not follow links.
2135 */
2136 #ifndef _SYS_SYSPROTO_H_
2137 struct olstat_args {
2138 char *path;
2139 struct ostat *ub;
2140 };
2141 #endif
2142 int
olstat(td,uap)2143 olstat(td, uap)
2144 struct thread *td;
2145 register struct olstat_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_lstat(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 * Convert from an old to a new stat structure.
2163 */
2164 void
cvtstat(st,ost)2165 cvtstat(st, ost)
2166 struct stat *st;
2167 struct ostat *ost;
2168 {
2169
2170 bzero(ost, sizeof(*ost));
2171 ost->st_dev = st->st_dev;
2172 ost->st_ino = st->st_ino;
2173 ost->st_mode = st->st_mode;
2174 ost->st_nlink = st->st_nlink;
2175 ost->st_uid = st->st_uid;
2176 ost->st_gid = st->st_gid;
2177 ost->st_rdev = st->st_rdev;
2178 if (st->st_size < (quad_t)1 << 32)
2179 ost->st_size = st->st_size;
2180 else
2181 ost->st_size = -2;
2182 ost->st_atim = st->st_atim;
2183 ost->st_mtim = st->st_mtim;
2184 ost->st_ctim = st->st_ctim;
2185 ost->st_blksize = st->st_blksize;
2186 ost->st_blocks = st->st_blocks;
2187 ost->st_flags = st->st_flags;
2188 ost->st_gen = st->st_gen;
2189 }
2190 #endif /* COMPAT_43 */
2191
2192 /*
2193 * Get file status; this version follows links.
2194 */
2195 #ifndef _SYS_SYSPROTO_H_
2196 struct stat_args {
2197 char *path;
2198 struct stat *ub;
2199 };
2200 #endif
2201 int
sys_stat(td,uap)2202 sys_stat(td, uap)
2203 struct thread *td;
2204 register struct stat_args /* {
2205 char *path;
2206 struct stat *ub;
2207 } */ *uap;
2208 {
2209 struct stat sb;
2210 int error;
2211
2212 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2213 if (error == 0)
2214 error = copyout(&sb, uap->ub, sizeof (sb));
2215 return (error);
2216 }
2217
2218 #ifndef _SYS_SYSPROTO_H_
2219 struct fstatat_args {
2220 int fd;
2221 char *path;
2222 struct stat *buf;
2223 int flag;
2224 }
2225 #endif
2226 int
sys_fstatat(struct thread * td,struct fstatat_args * uap)2227 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2228 {
2229 struct stat sb;
2230 int error;
2231
2232 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2233 UIO_USERSPACE, &sb);
2234 if (error == 0)
2235 error = copyout(&sb, uap->buf, sizeof (sb));
2236 return (error);
2237 }
2238
2239 int
kern_stat(struct thread * td,char * path,enum uio_seg pathseg,struct stat * sbp)2240 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2241 {
2242
2243 return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
2244 }
2245
2246 int
kern_statat(struct thread * td,int flag,int fd,char * path,enum uio_seg pathseg,struct stat * sbp)2247 kern_statat(struct thread *td, int flag, int fd, char *path,
2248 enum uio_seg pathseg, struct stat *sbp)
2249 {
2250
2251 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL));
2252 }
2253
2254 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))2255 kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
2256 enum uio_seg pathseg, struct stat *sbp,
2257 void (*hook)(struct vnode *vp, struct stat *sbp))
2258 {
2259 struct nameidata nd;
2260 struct stat sb;
2261 cap_rights_t rights;
2262 int error;
2263
2264 if (flag & ~AT_SYMLINK_NOFOLLOW)
2265 return (EINVAL);
2266
2267 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2268 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd,
2269 cap_rights_init(&rights, CAP_FSTAT), td);
2270
2271 if ((error = namei(&nd)) != 0)
2272 return (error);
2273 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2274 if (error == 0) {
2275 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode);
2276 if (S_ISREG(sb.st_mode))
2277 SDT_PROBE2(vfs, , stat, reg, path, pathseg);
2278 if (__predict_false(hook != NULL))
2279 hook(nd.ni_vp, &sb);
2280 }
2281 NDFREE(&nd, NDF_ONLY_PNBUF);
2282 vput(nd.ni_vp);
2283 if (error != 0)
2284 return (error);
2285 *sbp = sb;
2286 #ifdef KTRACE
2287 if (KTRPOINT(td, KTR_STRUCT))
2288 ktrstat(&sb);
2289 #endif
2290 return (0);
2291 }
2292
2293 /*
2294 * Get file status; this version does not follow links.
2295 */
2296 #ifndef _SYS_SYSPROTO_H_
2297 struct lstat_args {
2298 char *path;
2299 struct stat *ub;
2300 };
2301 #endif
2302 int
sys_lstat(td,uap)2303 sys_lstat(td, uap)
2304 struct thread *td;
2305 register struct lstat_args /* {
2306 char *path;
2307 struct stat *ub;
2308 } */ *uap;
2309 {
2310 struct stat sb;
2311 int error;
2312
2313 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2314 if (error == 0)
2315 error = copyout(&sb, uap->ub, sizeof (sb));
2316 return (error);
2317 }
2318
2319 int
kern_lstat(struct thread * td,char * path,enum uio_seg pathseg,struct stat * sbp)2320 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2321 {
2322
2323 return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg,
2324 sbp));
2325 }
2326
2327 /*
2328 * Implementation of the NetBSD [l]stat() functions.
2329 */
2330 void
cvtnstat(sb,nsb)2331 cvtnstat(sb, nsb)
2332 struct stat *sb;
2333 struct nstat *nsb;
2334 {
2335
2336 bzero(nsb, sizeof *nsb);
2337 nsb->st_dev = sb->st_dev;
2338 nsb->st_ino = sb->st_ino;
2339 nsb->st_mode = sb->st_mode;
2340 nsb->st_nlink = sb->st_nlink;
2341 nsb->st_uid = sb->st_uid;
2342 nsb->st_gid = sb->st_gid;
2343 nsb->st_rdev = sb->st_rdev;
2344 nsb->st_atim = sb->st_atim;
2345 nsb->st_mtim = sb->st_mtim;
2346 nsb->st_ctim = sb->st_ctim;
2347 nsb->st_size = sb->st_size;
2348 nsb->st_blocks = sb->st_blocks;
2349 nsb->st_blksize = sb->st_blksize;
2350 nsb->st_flags = sb->st_flags;
2351 nsb->st_gen = sb->st_gen;
2352 nsb->st_birthtim = sb->st_birthtim;
2353 }
2354
2355 #ifndef _SYS_SYSPROTO_H_
2356 struct nstat_args {
2357 char *path;
2358 struct nstat *ub;
2359 };
2360 #endif
2361 int
sys_nstat(td,uap)2362 sys_nstat(td, uap)
2363 struct thread *td;
2364 register struct nstat_args /* {
2365 char *path;
2366 struct nstat *ub;
2367 } */ *uap;
2368 {
2369 struct stat sb;
2370 struct nstat nsb;
2371 int error;
2372
2373 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2374 if (error != 0)
2375 return (error);
2376 cvtnstat(&sb, &nsb);
2377 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2378 }
2379
2380 /*
2381 * NetBSD lstat. Get file status; this version does not follow links.
2382 */
2383 #ifndef _SYS_SYSPROTO_H_
2384 struct lstat_args {
2385 char *path;
2386 struct stat *ub;
2387 };
2388 #endif
2389 int
sys_nlstat(td,uap)2390 sys_nlstat(td, uap)
2391 struct thread *td;
2392 register struct nlstat_args /* {
2393 char *path;
2394 struct nstat *ub;
2395 } */ *uap;
2396 {
2397 struct stat sb;
2398 struct nstat nsb;
2399 int error;
2400
2401 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2402 if (error != 0)
2403 return (error);
2404 cvtnstat(&sb, &nsb);
2405 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2406 }
2407
2408 /*
2409 * Get configurable pathname variables.
2410 */
2411 #ifndef _SYS_SYSPROTO_H_
2412 struct pathconf_args {
2413 char *path;
2414 int name;
2415 };
2416 #endif
2417 int
sys_pathconf(td,uap)2418 sys_pathconf(td, uap)
2419 struct thread *td;
2420 register struct pathconf_args /* {
2421 char *path;
2422 int name;
2423 } */ *uap;
2424 {
2425
2426 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW));
2427 }
2428
2429 #ifndef _SYS_SYSPROTO_H_
2430 struct lpathconf_args {
2431 char *path;
2432 int name;
2433 };
2434 #endif
2435 int
sys_lpathconf(td,uap)2436 sys_lpathconf(td, uap)
2437 struct thread *td;
2438 register struct lpathconf_args /* {
2439 char *path;
2440 int name;
2441 } */ *uap;
2442 {
2443
2444 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2445 NOFOLLOW));
2446 }
2447
2448 int
kern_pathconf(struct thread * td,char * path,enum uio_seg pathseg,int name,u_long flags)2449 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2450 u_long flags)
2451 {
2452 struct nameidata nd;
2453 int error;
2454
2455 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2456 pathseg, path, td);
2457 if ((error = namei(&nd)) != 0)
2458 return (error);
2459 NDFREE(&nd, NDF_ONLY_PNBUF);
2460
2461 /* If asynchronous I/O is available, it works for all files. */
2462 if (name == _PC_ASYNC_IO)
2463 td->td_retval[0] = async_io_version;
2464 else
2465 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
2466 vput(nd.ni_vp);
2467 return (error);
2468 }
2469
2470 /*
2471 * Return target name of a symbolic link.
2472 */
2473 #ifndef _SYS_SYSPROTO_H_
2474 struct readlink_args {
2475 char *path;
2476 char *buf;
2477 size_t count;
2478 };
2479 #endif
2480 int
sys_readlink(td,uap)2481 sys_readlink(td, uap)
2482 struct thread *td;
2483 register struct readlink_args /* {
2484 char *path;
2485 char *buf;
2486 size_t count;
2487 } */ *uap;
2488 {
2489
2490 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
2491 UIO_USERSPACE, uap->count));
2492 }
2493 #ifndef _SYS_SYSPROTO_H_
2494 struct readlinkat_args {
2495 int fd;
2496 char *path;
2497 char *buf;
2498 size_t bufsize;
2499 };
2500 #endif
2501 int
sys_readlinkat(struct thread * td,struct readlinkat_args * uap)2502 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2503 {
2504
2505 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2506 uap->buf, UIO_USERSPACE, uap->bufsize));
2507 }
2508
2509 int
kern_readlink(struct thread * td,char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2510 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
2511 enum uio_seg bufseg, size_t count)
2512 {
2513
2514 return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg,
2515 count));
2516 }
2517
2518 int
kern_readlinkat(struct thread * td,int fd,char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2519 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2520 char *buf, enum uio_seg bufseg, size_t count)
2521 {
2522 struct vnode *vp;
2523 struct iovec aiov;
2524 struct uio auio;
2525 struct nameidata nd;
2526 int error;
2527
2528 if (count > IOSIZE_MAX)
2529 return (EINVAL);
2530
2531 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
2532 pathseg, path, fd, td);
2533
2534 if ((error = namei(&nd)) != 0)
2535 return (error);
2536 NDFREE(&nd, NDF_ONLY_PNBUF);
2537 vp = nd.ni_vp;
2538 #ifdef MAC
2539 error = mac_vnode_check_readlink(td->td_ucred, vp);
2540 if (error != 0) {
2541 vput(vp);
2542 return (error);
2543 }
2544 #endif
2545 if (vp->v_type != VLNK)
2546 error = EINVAL;
2547 else {
2548 aiov.iov_base = buf;
2549 aiov.iov_len = count;
2550 auio.uio_iov = &aiov;
2551 auio.uio_iovcnt = 1;
2552 auio.uio_offset = 0;
2553 auio.uio_rw = UIO_READ;
2554 auio.uio_segflg = bufseg;
2555 auio.uio_td = td;
2556 auio.uio_resid = count;
2557 error = VOP_READLINK(vp, &auio, td->td_ucred);
2558 td->td_retval[0] = count - auio.uio_resid;
2559 }
2560 vput(vp);
2561 return (error);
2562 }
2563
2564 /*
2565 * Common implementation code for chflags() and fchflags().
2566 */
2567 static int
setfflags(td,vp,flags)2568 setfflags(td, vp, flags)
2569 struct thread *td;
2570 struct vnode *vp;
2571 u_long flags;
2572 {
2573 struct mount *mp;
2574 struct vattr vattr;
2575 int error;
2576
2577 /* We can't support the value matching VNOVAL. */
2578 if (flags == VNOVAL)
2579 return (EOPNOTSUPP);
2580
2581 /*
2582 * Prevent non-root users from setting flags on devices. When
2583 * a device is reused, users can retain ownership of the device
2584 * if they are allowed to set flags and programs assume that
2585 * chown can't fail when done as root.
2586 */
2587 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2588 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2589 if (error != 0)
2590 return (error);
2591 }
2592
2593 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2594 return (error);
2595 VATTR_NULL(&vattr);
2596 vattr.va_flags = flags;
2597 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2598 #ifdef MAC
2599 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2600 if (error == 0)
2601 #endif
2602 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2603 VOP_UNLOCK(vp, 0);
2604 vn_finished_write(mp);
2605 return (error);
2606 }
2607
2608 /*
2609 * Change flags of a file given a path name.
2610 */
2611 #ifndef _SYS_SYSPROTO_H_
2612 struct chflags_args {
2613 const char *path;
2614 u_long flags;
2615 };
2616 #endif
2617 int
sys_chflags(td,uap)2618 sys_chflags(td, uap)
2619 struct thread *td;
2620 register struct chflags_args /* {
2621 const char *path;
2622 u_long flags;
2623 } */ *uap;
2624 {
2625
2626 return (kern_chflags(td, uap->path, UIO_USERSPACE, uap->flags));
2627 }
2628
2629 #ifndef _SYS_SYSPROTO_H_
2630 struct chflagsat_args {
2631 int fd;
2632 const char *path;
2633 u_long flags;
2634 int atflag;
2635 }
2636 #endif
2637 int
sys_chflagsat(struct thread * td,struct chflagsat_args * uap)2638 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2639 {
2640 int fd = uap->fd;
2641 const char *path = uap->path;
2642 u_long flags = uap->flags;
2643 int atflag = uap->atflag;
2644
2645 if (atflag & ~AT_SYMLINK_NOFOLLOW)
2646 return (EINVAL);
2647
2648 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag));
2649 }
2650
2651 static int
kern_chflags(struct thread * td,const char * path,enum uio_seg pathseg,u_long flags)2652 kern_chflags(struct thread *td, const char *path, enum uio_seg pathseg,
2653 u_long flags)
2654 {
2655
2656 return (kern_chflagsat(td, AT_FDCWD, path, pathseg, flags, 0));
2657 }
2658
2659 /*
2660 * Same as chflags() but doesn't follow symlinks.
2661 */
2662 int
sys_lchflags(td,uap)2663 sys_lchflags(td, uap)
2664 struct thread *td;
2665 register struct lchflags_args /* {
2666 const char *path;
2667 u_long flags;
2668 } */ *uap;
2669 {
2670
2671 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2672 uap->flags, AT_SYMLINK_NOFOLLOW));
2673 }
2674
2675 static int
kern_chflagsat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,u_long flags,int atflag)2676 kern_chflagsat(struct thread *td, int fd, const char *path,
2677 enum uio_seg pathseg, u_long flags, int atflag)
2678 {
2679 struct nameidata nd;
2680 cap_rights_t rights;
2681 int error, follow;
2682
2683 AUDIT_ARG_FFLAGS(flags);
2684 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2685 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2686 cap_rights_init(&rights, CAP_FCHFLAGS), td);
2687 if ((error = namei(&nd)) != 0)
2688 return (error);
2689 NDFREE(&nd, NDF_ONLY_PNBUF);
2690 error = setfflags(td, nd.ni_vp, flags);
2691 vrele(nd.ni_vp);
2692 return (error);
2693 }
2694
2695 /*
2696 * Change flags of a file given a file descriptor.
2697 */
2698 #ifndef _SYS_SYSPROTO_H_
2699 struct fchflags_args {
2700 int fd;
2701 u_long flags;
2702 };
2703 #endif
2704 int
sys_fchflags(td,uap)2705 sys_fchflags(td, uap)
2706 struct thread *td;
2707 register struct fchflags_args /* {
2708 int fd;
2709 u_long flags;
2710 } */ *uap;
2711 {
2712 struct file *fp;
2713 cap_rights_t rights;
2714 int error;
2715
2716 AUDIT_ARG_FD(uap->fd);
2717 AUDIT_ARG_FFLAGS(uap->flags);
2718 error = getvnode(td->td_proc->p_fd, uap->fd,
2719 cap_rights_init(&rights, CAP_FCHFLAGS), &fp);
2720 if (error != 0)
2721 return (error);
2722 #ifdef AUDIT
2723 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2724 AUDIT_ARG_VNODE1(fp->f_vnode);
2725 VOP_UNLOCK(fp->f_vnode, 0);
2726 #endif
2727 error = setfflags(td, fp->f_vnode, uap->flags);
2728 fdrop(fp, td);
2729 return (error);
2730 }
2731
2732 /*
2733 * Common implementation code for chmod(), lchmod() and fchmod().
2734 */
2735 int
setfmode(td,cred,vp,mode)2736 setfmode(td, cred, vp, mode)
2737 struct thread *td;
2738 struct ucred *cred;
2739 struct vnode *vp;
2740 int mode;
2741 {
2742 struct mount *mp;
2743 struct vattr vattr;
2744 int error;
2745
2746 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2747 return (error);
2748 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2749 VATTR_NULL(&vattr);
2750 vattr.va_mode = mode & ALLPERMS;
2751 #ifdef MAC
2752 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2753 if (error == 0)
2754 #endif
2755 error = VOP_SETATTR(vp, &vattr, cred);
2756 VOP_UNLOCK(vp, 0);
2757 vn_finished_write(mp);
2758 return (error);
2759 }
2760
2761 /*
2762 * Change mode of a file given path name.
2763 */
2764 #ifndef _SYS_SYSPROTO_H_
2765 struct chmod_args {
2766 char *path;
2767 int mode;
2768 };
2769 #endif
2770 int
sys_chmod(td,uap)2771 sys_chmod(td, uap)
2772 struct thread *td;
2773 register struct chmod_args /* {
2774 char *path;
2775 int mode;
2776 } */ *uap;
2777 {
2778
2779 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
2780 }
2781
2782 #ifndef _SYS_SYSPROTO_H_
2783 struct fchmodat_args {
2784 int dirfd;
2785 char *path;
2786 mode_t mode;
2787 int flag;
2788 }
2789 #endif
2790 int
sys_fchmodat(struct thread * td,struct fchmodat_args * uap)2791 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2792 {
2793 int flag = uap->flag;
2794 int fd = uap->fd;
2795 char *path = uap->path;
2796 mode_t mode = uap->mode;
2797
2798 if (flag & ~AT_SYMLINK_NOFOLLOW)
2799 return (EINVAL);
2800
2801 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2802 }
2803
2804 int
kern_chmod(struct thread * td,char * path,enum uio_seg pathseg,int mode)2805 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2806 {
2807
2808 return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0));
2809 }
2810
2811 /*
2812 * Change mode of a file given path name (don't follow links.)
2813 */
2814 #ifndef _SYS_SYSPROTO_H_
2815 struct lchmod_args {
2816 char *path;
2817 int mode;
2818 };
2819 #endif
2820 int
sys_lchmod(td,uap)2821 sys_lchmod(td, uap)
2822 struct thread *td;
2823 register struct lchmod_args /* {
2824 char *path;
2825 int mode;
2826 } */ *uap;
2827 {
2828
2829 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2830 uap->mode, AT_SYMLINK_NOFOLLOW));
2831 }
2832
2833 int
kern_fchmodat(struct thread * td,int fd,char * path,enum uio_seg pathseg,mode_t mode,int flag)2834 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2835 mode_t mode, int flag)
2836 {
2837 struct nameidata nd;
2838 cap_rights_t rights;
2839 int error, follow;
2840
2841 AUDIT_ARG_MODE(mode);
2842 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2843 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2844 cap_rights_init(&rights, CAP_FCHMOD), td);
2845 if ((error = namei(&nd)) != 0)
2846 return (error);
2847 NDFREE(&nd, NDF_ONLY_PNBUF);
2848 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2849 vrele(nd.ni_vp);
2850 return (error);
2851 }
2852
2853 /*
2854 * Change mode of a file given a file descriptor.
2855 */
2856 #ifndef _SYS_SYSPROTO_H_
2857 struct fchmod_args {
2858 int fd;
2859 int mode;
2860 };
2861 #endif
2862 int
sys_fchmod(struct thread * td,struct fchmod_args * uap)2863 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2864 {
2865 struct file *fp;
2866 cap_rights_t rights;
2867 int error;
2868
2869 AUDIT_ARG_FD(uap->fd);
2870 AUDIT_ARG_MODE(uap->mode);
2871
2872 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHMOD), &fp);
2873 if (error != 0)
2874 return (error);
2875 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2876 fdrop(fp, td);
2877 return (error);
2878 }
2879
2880 /*
2881 * Common implementation for chown(), lchown(), and fchown()
2882 */
2883 int
setfown(td,cred,vp,uid,gid)2884 setfown(td, cred, vp, uid, gid)
2885 struct thread *td;
2886 struct ucred *cred;
2887 struct vnode *vp;
2888 uid_t uid;
2889 gid_t gid;
2890 {
2891 struct mount *mp;
2892 struct vattr vattr;
2893 int error;
2894
2895 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2896 return (error);
2897 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2898 VATTR_NULL(&vattr);
2899 vattr.va_uid = uid;
2900 vattr.va_gid = gid;
2901 #ifdef MAC
2902 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
2903 vattr.va_gid);
2904 if (error == 0)
2905 #endif
2906 error = VOP_SETATTR(vp, &vattr, cred);
2907 VOP_UNLOCK(vp, 0);
2908 vn_finished_write(mp);
2909 return (error);
2910 }
2911
2912 /*
2913 * Set ownership given a path name.
2914 */
2915 #ifndef _SYS_SYSPROTO_H_
2916 struct chown_args {
2917 char *path;
2918 int uid;
2919 int gid;
2920 };
2921 #endif
2922 int
sys_chown(td,uap)2923 sys_chown(td, uap)
2924 struct thread *td;
2925 register struct chown_args /* {
2926 char *path;
2927 int uid;
2928 int gid;
2929 } */ *uap;
2930 {
2931
2932 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
2933 }
2934
2935 #ifndef _SYS_SYSPROTO_H_
2936 struct fchownat_args {
2937 int fd;
2938 const char * path;
2939 uid_t uid;
2940 gid_t gid;
2941 int flag;
2942 };
2943 #endif
2944 int
sys_fchownat(struct thread * td,struct fchownat_args * uap)2945 sys_fchownat(struct thread *td, struct fchownat_args *uap)
2946 {
2947 int flag;
2948
2949 flag = uap->flag;
2950 if (flag & ~AT_SYMLINK_NOFOLLOW)
2951 return (EINVAL);
2952
2953 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
2954 uap->gid, uap->flag));
2955 }
2956
2957 int
kern_chown(struct thread * td,char * path,enum uio_seg pathseg,int uid,int gid)2958 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
2959 int gid)
2960 {
2961
2962 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0));
2963 }
2964
2965 int
kern_fchownat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int uid,int gid,int flag)2966 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2967 int uid, int gid, int flag)
2968 {
2969 struct nameidata nd;
2970 cap_rights_t rights;
2971 int error, follow;
2972
2973 AUDIT_ARG_OWNER(uid, gid);
2974 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2975 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2976 cap_rights_init(&rights, CAP_FCHOWN), td);
2977
2978 if ((error = namei(&nd)) != 0)
2979 return (error);
2980 NDFREE(&nd, NDF_ONLY_PNBUF);
2981 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
2982 vrele(nd.ni_vp);
2983 return (error);
2984 }
2985
2986 /*
2987 * Set ownership given a path name, do not cross symlinks.
2988 */
2989 #ifndef _SYS_SYSPROTO_H_
2990 struct lchown_args {
2991 char *path;
2992 int uid;
2993 int gid;
2994 };
2995 #endif
2996 int
sys_lchown(td,uap)2997 sys_lchown(td, uap)
2998 struct thread *td;
2999 register struct lchown_args /* {
3000 char *path;
3001 int uid;
3002 int gid;
3003 } */ *uap;
3004 {
3005
3006 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
3007 }
3008
3009 int
kern_lchown(struct thread * td,char * path,enum uio_seg pathseg,int uid,int gid)3010 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3011 int gid)
3012 {
3013
3014 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid,
3015 AT_SYMLINK_NOFOLLOW));
3016 }
3017
3018 /*
3019 * Set ownership given a file descriptor.
3020 */
3021 #ifndef _SYS_SYSPROTO_H_
3022 struct fchown_args {
3023 int fd;
3024 int uid;
3025 int gid;
3026 };
3027 #endif
3028 int
sys_fchown(td,uap)3029 sys_fchown(td, uap)
3030 struct thread *td;
3031 register struct fchown_args /* {
3032 int fd;
3033 int uid;
3034 int gid;
3035 } */ *uap;
3036 {
3037 struct file *fp;
3038 cap_rights_t rights;
3039 int error;
3040
3041 AUDIT_ARG_FD(uap->fd);
3042 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3043 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHOWN), &fp);
3044 if (error != 0)
3045 return (error);
3046 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3047 fdrop(fp, td);
3048 return (error);
3049 }
3050
3051 /*
3052 * Common implementation code for utimes(), lutimes(), and futimes().
3053 */
3054 static int
getutimes(usrtvp,tvpseg,tsp)3055 getutimes(usrtvp, tvpseg, tsp)
3056 const struct timeval *usrtvp;
3057 enum uio_seg tvpseg;
3058 struct timespec *tsp;
3059 {
3060 struct timeval tv[2];
3061 const struct timeval *tvp;
3062 int error;
3063
3064 if (usrtvp == NULL) {
3065 vfs_timestamp(&tsp[0]);
3066 tsp[1] = tsp[0];
3067 } else {
3068 if (tvpseg == UIO_SYSSPACE) {
3069 tvp = usrtvp;
3070 } else {
3071 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3072 return (error);
3073 tvp = tv;
3074 }
3075
3076 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3077 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3078 return (EINVAL);
3079 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3080 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3081 }
3082 return (0);
3083 }
3084
3085 /*
3086 * Common implementation code for futimens(), utimensat().
3087 */
3088 #define UTIMENS_NULL 0x1
3089 #define UTIMENS_EXIT 0x2
3090 static int
getutimens(const struct timespec * usrtsp,enum uio_seg tspseg,struct timespec * tsp,int * retflags)3091 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
3092 struct timespec *tsp, int *retflags)
3093 {
3094 struct timespec tsnow;
3095 int error;
3096
3097 vfs_timestamp(&tsnow);
3098 *retflags = 0;
3099 if (usrtsp == NULL) {
3100 tsp[0] = tsnow;
3101 tsp[1] = tsnow;
3102 *retflags |= UTIMENS_NULL;
3103 return (0);
3104 }
3105 if (tspseg == UIO_SYSSPACE) {
3106 tsp[0] = usrtsp[0];
3107 tsp[1] = usrtsp[1];
3108 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
3109 return (error);
3110 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
3111 *retflags |= UTIMENS_EXIT;
3112 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
3113 *retflags |= UTIMENS_NULL;
3114 if (tsp[0].tv_nsec == UTIME_OMIT)
3115 tsp[0].tv_sec = VNOVAL;
3116 else if (tsp[0].tv_nsec == UTIME_NOW)
3117 tsp[0] = tsnow;
3118 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
3119 return (EINVAL);
3120 if (tsp[1].tv_nsec == UTIME_OMIT)
3121 tsp[1].tv_sec = VNOVAL;
3122 else if (tsp[1].tv_nsec == UTIME_NOW)
3123 tsp[1] = tsnow;
3124 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
3125 return (EINVAL);
3126
3127 return (0);
3128 }
3129
3130 /*
3131 * Common implementation code for utimes(), lutimes(), futimes(), futimens(),
3132 * and utimensat().
3133 */
3134 static int
setutimes(td,vp,ts,numtimes,nullflag)3135 setutimes(td, vp, ts, numtimes, nullflag)
3136 struct thread *td;
3137 struct vnode *vp;
3138 const struct timespec *ts;
3139 int numtimes;
3140 int nullflag;
3141 {
3142 struct mount *mp;
3143 struct vattr vattr;
3144 int error, setbirthtime;
3145
3146 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3147 return (error);
3148 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3149 setbirthtime = 0;
3150 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3151 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3152 setbirthtime = 1;
3153 VATTR_NULL(&vattr);
3154 vattr.va_atime = ts[0];
3155 vattr.va_mtime = ts[1];
3156 if (setbirthtime)
3157 vattr.va_birthtime = ts[1];
3158 if (numtimes > 2)
3159 vattr.va_birthtime = ts[2];
3160 if (nullflag)
3161 vattr.va_vaflags |= VA_UTIMES_NULL;
3162 #ifdef MAC
3163 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3164 vattr.va_mtime);
3165 #endif
3166 if (error == 0)
3167 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3168 VOP_UNLOCK(vp, 0);
3169 vn_finished_write(mp);
3170 return (error);
3171 }
3172
3173 /*
3174 * Set the access and modification times of a file.
3175 */
3176 #ifndef _SYS_SYSPROTO_H_
3177 struct utimes_args {
3178 char *path;
3179 struct timeval *tptr;
3180 };
3181 #endif
3182 int
sys_utimes(td,uap)3183 sys_utimes(td, uap)
3184 struct thread *td;
3185 register struct utimes_args /* {
3186 char *path;
3187 struct timeval *tptr;
3188 } */ *uap;
3189 {
3190
3191 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3192 UIO_USERSPACE));
3193 }
3194
3195 #ifndef _SYS_SYSPROTO_H_
3196 struct futimesat_args {
3197 int fd;
3198 const char * path;
3199 const struct timeval * times;
3200 };
3201 #endif
3202 int
sys_futimesat(struct thread * td,struct futimesat_args * uap)3203 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3204 {
3205
3206 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3207 uap->times, UIO_USERSPACE));
3208 }
3209
3210 int
kern_utimes(struct thread * td,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3211 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
3212 struct timeval *tptr, enum uio_seg tptrseg)
3213 {
3214
3215 return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg));
3216 }
3217
3218 int
kern_utimesat(struct thread * td,int fd,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3219 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3220 struct timeval *tptr, enum uio_seg tptrseg)
3221 {
3222 struct nameidata nd;
3223 struct timespec ts[2];
3224 cap_rights_t rights;
3225 int error;
3226
3227 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3228 return (error);
3229 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3230 cap_rights_init(&rights, CAP_FUTIMES), td);
3231
3232 if ((error = namei(&nd)) != 0)
3233 return (error);
3234 NDFREE(&nd, NDF_ONLY_PNBUF);
3235 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3236 vrele(nd.ni_vp);
3237 return (error);
3238 }
3239
3240 /*
3241 * Set the access and modification times of a file.
3242 */
3243 #ifndef _SYS_SYSPROTO_H_
3244 struct lutimes_args {
3245 char *path;
3246 struct timeval *tptr;
3247 };
3248 #endif
3249 int
sys_lutimes(td,uap)3250 sys_lutimes(td, uap)
3251 struct thread *td;
3252 register struct lutimes_args /* {
3253 char *path;
3254 struct timeval *tptr;
3255 } */ *uap;
3256 {
3257
3258 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3259 UIO_USERSPACE));
3260 }
3261
3262 int
kern_lutimes(struct thread * td,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3263 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
3264 struct timeval *tptr, enum uio_seg tptrseg)
3265 {
3266 struct timespec ts[2];
3267 struct nameidata nd;
3268 int error;
3269
3270 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3271 return (error);
3272 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
3273 if ((error = namei(&nd)) != 0)
3274 return (error);
3275 NDFREE(&nd, NDF_ONLY_PNBUF);
3276 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3277 vrele(nd.ni_vp);
3278 return (error);
3279 }
3280
3281 /*
3282 * Set the access and modification times of a file.
3283 */
3284 #ifndef _SYS_SYSPROTO_H_
3285 struct futimes_args {
3286 int fd;
3287 struct timeval *tptr;
3288 };
3289 #endif
3290 int
sys_futimes(td,uap)3291 sys_futimes(td, uap)
3292 struct thread *td;
3293 register struct futimes_args /* {
3294 int fd;
3295 struct timeval *tptr;
3296 } */ *uap;
3297 {
3298
3299 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3300 }
3301
3302 int
kern_futimes(struct thread * td,int fd,struct timeval * tptr,enum uio_seg tptrseg)3303 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3304 enum uio_seg tptrseg)
3305 {
3306 struct timespec ts[2];
3307 struct file *fp;
3308 cap_rights_t rights;
3309 int error;
3310
3311 AUDIT_ARG_FD(fd);
3312 error = getutimes(tptr, tptrseg, ts);
3313 if (error != 0)
3314 return (error);
3315 error = getvnode(td->td_proc->p_fd, fd,
3316 cap_rights_init(&rights, CAP_FUTIMES), &fp);
3317 if (error != 0)
3318 return (error);
3319 #ifdef AUDIT
3320 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3321 AUDIT_ARG_VNODE1(fp->f_vnode);
3322 VOP_UNLOCK(fp->f_vnode, 0);
3323 #endif
3324 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3325 fdrop(fp, td);
3326 return (error);
3327 }
3328
3329 int
sys_futimens(struct thread * td,struct futimens_args * uap)3330 sys_futimens(struct thread *td, struct futimens_args *uap)
3331 {
3332
3333 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
3334 }
3335
3336 int
kern_futimens(struct thread * td,int fd,struct timespec * tptr,enum uio_seg tptrseg)3337 kern_futimens(struct thread *td, int fd, struct timespec *tptr,
3338 enum uio_seg tptrseg)
3339 {
3340 struct timespec ts[2];
3341 struct file *fp;
3342 cap_rights_t rights;
3343 int error, flags;
3344
3345 AUDIT_ARG_FD(fd);
3346 error = getutimens(tptr, tptrseg, ts, &flags);
3347 if (error != 0)
3348 return (error);
3349 if (flags & UTIMENS_EXIT)
3350 return (0);
3351 error = getvnode(td->td_proc->p_fd, fd,
3352 cap_rights_init(&rights, CAP_FUTIMES), &fp);
3353 if (error != 0)
3354 return (error);
3355 #ifdef AUDIT
3356 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3357 AUDIT_ARG_VNODE1(fp->f_vnode);
3358 VOP_UNLOCK(fp->f_vnode, 0);
3359 #endif
3360 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
3361 fdrop(fp, td);
3362 return (error);
3363 }
3364
3365 int
sys_utimensat(struct thread * td,struct utimensat_args * uap)3366 sys_utimensat(struct thread *td, struct utimensat_args *uap)
3367 {
3368
3369 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
3370 uap->times, UIO_USERSPACE, uap->flag));
3371 }
3372
3373 int
kern_utimensat(struct thread * td,int fd,char * path,enum uio_seg pathseg,struct timespec * tptr,enum uio_seg tptrseg,int flag)3374 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3375 struct timespec *tptr, enum uio_seg tptrseg, int flag)
3376 {
3377 struct nameidata nd;
3378 struct timespec ts[2];
3379 cap_rights_t rights;
3380 int error, flags;
3381
3382 if (flag & ~AT_SYMLINK_NOFOLLOW)
3383 return (EINVAL);
3384
3385 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
3386 return (error);
3387 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
3388 FOLLOW) | AUDITVNODE1, pathseg, path, fd,
3389 cap_rights_init(&rights, CAP_FUTIMES), td);
3390 if ((error = namei(&nd)) != 0)
3391 return (error);
3392 /*
3393 * We are allowed to call namei() regardless of 2xUTIME_OMIT.
3394 * POSIX states:
3395 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
3396 * "Search permission is denied by a component of the path prefix."
3397 */
3398 NDFREE(&nd, NDF_ONLY_PNBUF);
3399 if ((flags & UTIMENS_EXIT) == 0)
3400 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
3401 vrele(nd.ni_vp);
3402 return (error);
3403 }
3404
3405 /*
3406 * Truncate a file given its path name.
3407 */
3408 #ifndef _SYS_SYSPROTO_H_
3409 struct truncate_args {
3410 char *path;
3411 int pad;
3412 off_t length;
3413 };
3414 #endif
3415 int
sys_truncate(td,uap)3416 sys_truncate(td, uap)
3417 struct thread *td;
3418 register struct truncate_args /* {
3419 char *path;
3420 int pad;
3421 off_t length;
3422 } */ *uap;
3423 {
3424
3425 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3426 }
3427
3428 int
kern_truncate(struct thread * td,char * path,enum uio_seg pathseg,off_t length)3429 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3430 {
3431 struct mount *mp;
3432 struct vnode *vp;
3433 void *rl_cookie;
3434 struct vattr vattr;
3435 struct nameidata nd;
3436 int error;
3437
3438 if (length < 0)
3439 return(EINVAL);
3440 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
3441 if ((error = namei(&nd)) != 0)
3442 return (error);
3443 vp = nd.ni_vp;
3444 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3445 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3446 vn_rangelock_unlock(vp, rl_cookie);
3447 vrele(vp);
3448 return (error);
3449 }
3450 NDFREE(&nd, NDF_ONLY_PNBUF);
3451 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3452 if (vp->v_type == VDIR)
3453 error = EISDIR;
3454 #ifdef MAC
3455 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3456 }
3457 #endif
3458 else if ((error = vn_writechk(vp)) == 0 &&
3459 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3460 VATTR_NULL(&vattr);
3461 vattr.va_size = length;
3462 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3463 }
3464 VOP_UNLOCK(vp, 0);
3465 vn_finished_write(mp);
3466 vn_rangelock_unlock(vp, rl_cookie);
3467 vrele(vp);
3468 return (error);
3469 }
3470
3471 #if defined(COMPAT_43)
3472 /*
3473 * Truncate a file given its path name.
3474 */
3475 #ifndef _SYS_SYSPROTO_H_
3476 struct otruncate_args {
3477 char *path;
3478 long length;
3479 };
3480 #endif
3481 int
otruncate(td,uap)3482 otruncate(td, uap)
3483 struct thread *td;
3484 register struct otruncate_args /* {
3485 char *path;
3486 long length;
3487 } */ *uap;
3488 {
3489 struct truncate_args /* {
3490 char *path;
3491 int pad;
3492 off_t length;
3493 } */ nuap;
3494
3495 nuap.path = uap->path;
3496 nuap.length = uap->length;
3497 return (sys_truncate(td, &nuap));
3498 }
3499 #endif /* COMPAT_43 */
3500
3501 /* Versions with the pad argument */
3502 int
freebsd6_truncate(struct thread * td,struct freebsd6_truncate_args * uap)3503 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3504 {
3505 struct truncate_args ouap;
3506
3507 ouap.path = uap->path;
3508 ouap.length = uap->length;
3509 return (sys_truncate(td, &ouap));
3510 }
3511
3512 int
freebsd6_ftruncate(struct thread * td,struct freebsd6_ftruncate_args * uap)3513 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3514 {
3515 struct ftruncate_args ouap;
3516
3517 ouap.fd = uap->fd;
3518 ouap.length = uap->length;
3519 return (sys_ftruncate(td, &ouap));
3520 }
3521
3522 /*
3523 * Sync an open file.
3524 */
3525 #ifndef _SYS_SYSPROTO_H_
3526 struct fsync_args {
3527 int fd;
3528 };
3529 #endif
3530 int
sys_fsync(td,uap)3531 sys_fsync(td, uap)
3532 struct thread *td;
3533 struct fsync_args /* {
3534 int fd;
3535 } */ *uap;
3536 {
3537 struct vnode *vp;
3538 struct mount *mp;
3539 struct file *fp;
3540 cap_rights_t rights;
3541 int error, lock_flags;
3542
3543 AUDIT_ARG_FD(uap->fd);
3544 error = getvnode(td->td_proc->p_fd, uap->fd,
3545 cap_rights_init(&rights, CAP_FSYNC), &fp);
3546 if (error != 0)
3547 return (error);
3548 vp = fp->f_vnode;
3549 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3550 if (error != 0)
3551 goto drop;
3552 if (MNT_SHARED_WRITES(mp) ||
3553 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3554 lock_flags = LK_SHARED;
3555 } else {
3556 lock_flags = LK_EXCLUSIVE;
3557 }
3558 vn_lock(vp, lock_flags | LK_RETRY);
3559 AUDIT_ARG_VNODE1(vp);
3560 if (vp->v_object != NULL) {
3561 VM_OBJECT_WLOCK(vp->v_object);
3562 vm_object_page_clean(vp->v_object, 0, 0, 0);
3563 VM_OBJECT_WUNLOCK(vp->v_object);
3564 }
3565 error = VOP_FSYNC(vp, MNT_WAIT, td);
3566
3567 VOP_UNLOCK(vp, 0);
3568 vn_finished_write(mp);
3569 drop:
3570 fdrop(fp, td);
3571 return (error);
3572 }
3573
3574 /*
3575 * Rename files. Source and destination must either both be directories, or
3576 * both not be directories. If target is a directory, it must be empty.
3577 */
3578 #ifndef _SYS_SYSPROTO_H_
3579 struct rename_args {
3580 char *from;
3581 char *to;
3582 };
3583 #endif
3584 int
sys_rename(td,uap)3585 sys_rename(td, uap)
3586 struct thread *td;
3587 register struct rename_args /* {
3588 char *from;
3589 char *to;
3590 } */ *uap;
3591 {
3592
3593 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
3594 }
3595
3596 #ifndef _SYS_SYSPROTO_H_
3597 struct renameat_args {
3598 int oldfd;
3599 char *old;
3600 int newfd;
3601 char *new;
3602 };
3603 #endif
3604 int
sys_renameat(struct thread * td,struct renameat_args * uap)3605 sys_renameat(struct thread *td, struct renameat_args *uap)
3606 {
3607
3608 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3609 UIO_USERSPACE));
3610 }
3611
3612 int
kern_rename(struct thread * td,char * from,char * to,enum uio_seg pathseg)3613 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
3614 {
3615
3616 return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg));
3617 }
3618
3619 int
kern_renameat(struct thread * td,int oldfd,char * old,int newfd,char * new,enum uio_seg pathseg)3620 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3621 enum uio_seg pathseg)
3622 {
3623 struct mount *mp = NULL;
3624 struct vnode *tvp, *fvp, *tdvp;
3625 struct nameidata fromnd, tond;
3626 cap_rights_t rights;
3627 int error;
3628
3629 again:
3630 bwillwrite();
3631 #ifdef MAC
3632 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3633 AUDITVNODE1, pathseg, old, oldfd,
3634 cap_rights_init(&rights, CAP_RENAMEAT), td);
3635 #else
3636 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
3637 pathseg, old, oldfd, cap_rights_init(&rights, CAP_RENAMEAT), td);
3638 #endif
3639
3640 if ((error = namei(&fromnd)) != 0)
3641 return (error);
3642 #ifdef MAC
3643 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3644 fromnd.ni_vp, &fromnd.ni_cnd);
3645 VOP_UNLOCK(fromnd.ni_dvp, 0);
3646 if (fromnd.ni_dvp != fromnd.ni_vp)
3647 VOP_UNLOCK(fromnd.ni_vp, 0);
3648 #endif
3649 fvp = fromnd.ni_vp;
3650 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
3651 SAVESTART | AUDITVNODE2, pathseg, new, newfd,
3652 cap_rights_init(&rights, CAP_LINKAT), td);
3653 if (fromnd.ni_vp->v_type == VDIR)
3654 tond.ni_cnd.cn_flags |= WILLBEDIR;
3655 if ((error = namei(&tond)) != 0) {
3656 /* Translate error code for rename("dir1", "dir2/."). */
3657 if (error == EISDIR && fvp->v_type == VDIR)
3658 error = EINVAL;
3659 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3660 vrele(fromnd.ni_dvp);
3661 vrele(fvp);
3662 goto out1;
3663 }
3664 tdvp = tond.ni_dvp;
3665 tvp = tond.ni_vp;
3666 error = vn_start_write(fvp, &mp, V_NOWAIT);
3667 if (error != 0) {
3668 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3669 NDFREE(&tond, NDF_ONLY_PNBUF);
3670 if (tvp != NULL)
3671 vput(tvp);
3672 if (tdvp == tvp)
3673 vrele(tdvp);
3674 else
3675 vput(tdvp);
3676 vrele(fromnd.ni_dvp);
3677 vrele(fvp);
3678 vrele(tond.ni_startdir);
3679 if (fromnd.ni_startdir != NULL)
3680 vrele(fromnd.ni_startdir);
3681 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
3682 if (error != 0)
3683 return (error);
3684 goto again;
3685 }
3686 if (tvp != NULL) {
3687 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3688 error = ENOTDIR;
3689 goto out;
3690 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3691 error = EISDIR;
3692 goto out;
3693 }
3694 #ifdef CAPABILITIES
3695 if (newfd != AT_FDCWD) {
3696 /*
3697 * If the target already exists we require CAP_UNLINKAT
3698 * from 'newfd'.
3699 */
3700 error = cap_check(&tond.ni_filecaps.fc_rights,
3701 cap_rights_init(&rights, CAP_UNLINKAT));
3702 if (error != 0)
3703 goto out;
3704 }
3705 #endif
3706 }
3707 if (fvp == tdvp) {
3708 error = EINVAL;
3709 goto out;
3710 }
3711 /*
3712 * If the source is the same as the destination (that is, if they
3713 * are links to the same vnode), then there is nothing to do.
3714 */
3715 if (fvp == tvp)
3716 error = -1;
3717 #ifdef MAC
3718 else
3719 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3720 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3721 #endif
3722 out:
3723 if (error == 0) {
3724 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3725 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3726 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3727 NDFREE(&tond, NDF_ONLY_PNBUF);
3728 } else {
3729 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3730 NDFREE(&tond, NDF_ONLY_PNBUF);
3731 if (tvp != NULL)
3732 vput(tvp);
3733 if (tdvp == tvp)
3734 vrele(tdvp);
3735 else
3736 vput(tdvp);
3737 vrele(fromnd.ni_dvp);
3738 vrele(fvp);
3739 }
3740 vrele(tond.ni_startdir);
3741 vn_finished_write(mp);
3742 out1:
3743 if (fromnd.ni_startdir)
3744 vrele(fromnd.ni_startdir);
3745 if (error == -1)
3746 return (0);
3747 return (error);
3748 }
3749
3750 /*
3751 * Make a directory file.
3752 */
3753 #ifndef _SYS_SYSPROTO_H_
3754 struct mkdir_args {
3755 char *path;
3756 int mode;
3757 };
3758 #endif
3759 int
sys_mkdir(td,uap)3760 sys_mkdir(td, uap)
3761 struct thread *td;
3762 register struct mkdir_args /* {
3763 char *path;
3764 int mode;
3765 } */ *uap;
3766 {
3767
3768 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
3769 }
3770
3771 #ifndef _SYS_SYSPROTO_H_
3772 struct mkdirat_args {
3773 int fd;
3774 char *path;
3775 mode_t mode;
3776 };
3777 #endif
3778 int
sys_mkdirat(struct thread * td,struct mkdirat_args * uap)3779 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3780 {
3781
3782 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3783 }
3784
3785 int
kern_mkdir(struct thread * td,char * path,enum uio_seg segflg,int mode)3786 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
3787 {
3788
3789 return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode));
3790 }
3791
3792 int
kern_mkdirat(struct thread * td,int fd,char * path,enum uio_seg segflg,int mode)3793 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3794 int mode)
3795 {
3796 struct mount *mp;
3797 struct vnode *vp;
3798 struct vattr vattr;
3799 struct nameidata nd;
3800 cap_rights_t rights;
3801 int error;
3802
3803 AUDIT_ARG_MODE(mode);
3804 restart:
3805 bwillwrite();
3806 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
3807 NOCACHE, segflg, path, fd, cap_rights_init(&rights, CAP_MKDIRAT),
3808 td);
3809 nd.ni_cnd.cn_flags |= WILLBEDIR;
3810 if ((error = namei(&nd)) != 0)
3811 return (error);
3812 vp = nd.ni_vp;
3813 if (vp != NULL) {
3814 NDFREE(&nd, NDF_ONLY_PNBUF);
3815 /*
3816 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3817 * the strange behaviour of leaving the vnode unlocked
3818 * if the target is the same vnode as the parent.
3819 */
3820 if (vp == nd.ni_dvp)
3821 vrele(nd.ni_dvp);
3822 else
3823 vput(nd.ni_dvp);
3824 vrele(vp);
3825 return (EEXIST);
3826 }
3827 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3828 NDFREE(&nd, NDF_ONLY_PNBUF);
3829 vput(nd.ni_dvp);
3830 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3831 return (error);
3832 goto restart;
3833 }
3834 VATTR_NULL(&vattr);
3835 vattr.va_type = VDIR;
3836 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3837 #ifdef MAC
3838 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3839 &vattr);
3840 if (error != 0)
3841 goto out;
3842 #endif
3843 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3844 #ifdef MAC
3845 out:
3846 #endif
3847 NDFREE(&nd, NDF_ONLY_PNBUF);
3848 vput(nd.ni_dvp);
3849 if (error == 0)
3850 vput(nd.ni_vp);
3851 vn_finished_write(mp);
3852 return (error);
3853 }
3854
3855 /*
3856 * Remove a directory file.
3857 */
3858 #ifndef _SYS_SYSPROTO_H_
3859 struct rmdir_args {
3860 char *path;
3861 };
3862 #endif
3863 int
sys_rmdir(td,uap)3864 sys_rmdir(td, uap)
3865 struct thread *td;
3866 struct rmdir_args /* {
3867 char *path;
3868 } */ *uap;
3869 {
3870
3871 return (kern_rmdir(td, uap->path, UIO_USERSPACE));
3872 }
3873
3874 int
kern_rmdir(struct thread * td,char * path,enum uio_seg pathseg)3875 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
3876 {
3877
3878 return (kern_rmdirat(td, AT_FDCWD, path, pathseg));
3879 }
3880
3881 int
kern_rmdirat(struct thread * td,int fd,char * path,enum uio_seg pathseg)3882 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3883 {
3884 struct mount *mp;
3885 struct vnode *vp;
3886 struct nameidata nd;
3887 cap_rights_t rights;
3888 int error;
3889
3890 restart:
3891 bwillwrite();
3892 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3893 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
3894 if ((error = namei(&nd)) != 0)
3895 return (error);
3896 vp = nd.ni_vp;
3897 if (vp->v_type != VDIR) {
3898 error = ENOTDIR;
3899 goto out;
3900 }
3901 /*
3902 * No rmdir "." please.
3903 */
3904 if (nd.ni_dvp == vp) {
3905 error = EINVAL;
3906 goto out;
3907 }
3908 /*
3909 * The root of a mounted filesystem cannot be deleted.
3910 */
3911 if (vp->v_vflag & VV_ROOT) {
3912 error = EBUSY;
3913 goto out;
3914 }
3915 #ifdef MAC
3916 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3917 &nd.ni_cnd);
3918 if (error != 0)
3919 goto out;
3920 #endif
3921 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3922 NDFREE(&nd, NDF_ONLY_PNBUF);
3923 vput(vp);
3924 if (nd.ni_dvp == vp)
3925 vrele(nd.ni_dvp);
3926 else
3927 vput(nd.ni_dvp);
3928 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3929 return (error);
3930 goto restart;
3931 }
3932 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3933 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3934 vn_finished_write(mp);
3935 out:
3936 NDFREE(&nd, NDF_ONLY_PNBUF);
3937 vput(vp);
3938 if (nd.ni_dvp == vp)
3939 vrele(nd.ni_dvp);
3940 else
3941 vput(nd.ni_dvp);
3942 return (error);
3943 }
3944
3945 #ifdef COMPAT_43
3946 /*
3947 * Read a block of directory entries in a filesystem independent format.
3948 */
3949 #ifndef _SYS_SYSPROTO_H_
3950 struct ogetdirentries_args {
3951 int fd;
3952 char *buf;
3953 u_int count;
3954 long *basep;
3955 };
3956 #endif
3957 int
ogetdirentries(struct thread * td,struct ogetdirentries_args * uap)3958 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
3959 {
3960 long loff;
3961 int error;
3962
3963 error = kern_ogetdirentries(td, uap, &loff);
3964 if (error == 0)
3965 error = copyout(&loff, uap->basep, sizeof(long));
3966 return (error);
3967 }
3968
3969 int
kern_ogetdirentries(struct thread * td,struct ogetdirentries_args * uap,long * ploff)3970 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
3971 long *ploff)
3972 {
3973 struct vnode *vp;
3974 struct file *fp;
3975 struct uio auio, kuio;
3976 struct iovec aiov, kiov;
3977 struct dirent *dp, *edp;
3978 cap_rights_t rights;
3979 caddr_t dirbuf;
3980 int error, eofflag, readcnt;
3981 long loff;
3982 off_t foffset;
3983
3984 /* XXX arbitrary sanity limit on `count'. */
3985 if (uap->count > 64 * 1024)
3986 return (EINVAL);
3987 error = getvnode(td->td_proc->p_fd, uap->fd,
3988 cap_rights_init(&rights, CAP_READ), &fp);
3989 if (error != 0)
3990 return (error);
3991 if ((fp->f_flag & FREAD) == 0) {
3992 fdrop(fp, td);
3993 return (EBADF);
3994 }
3995 vp = fp->f_vnode;
3996 foffset = foffset_lock(fp, 0);
3997 unionread:
3998 if (vp->v_type != VDIR) {
3999 foffset_unlock(fp, foffset, 0);
4000 fdrop(fp, td);
4001 return (EINVAL);
4002 }
4003 aiov.iov_base = uap->buf;
4004 aiov.iov_len = uap->count;
4005 auio.uio_iov = &aiov;
4006 auio.uio_iovcnt = 1;
4007 auio.uio_rw = UIO_READ;
4008 auio.uio_segflg = UIO_USERSPACE;
4009 auio.uio_td = td;
4010 auio.uio_resid = uap->count;
4011 vn_lock(vp, LK_SHARED | LK_RETRY);
4012 loff = auio.uio_offset = foffset;
4013 #ifdef MAC
4014 error = mac_vnode_check_readdir(td->td_ucred, vp);
4015 if (error != 0) {
4016 VOP_UNLOCK(vp, 0);
4017 foffset_unlock(fp, foffset, FOF_NOUPDATE);
4018 fdrop(fp, td);
4019 return (error);
4020 }
4021 #endif
4022 # if (BYTE_ORDER != LITTLE_ENDIAN)
4023 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
4024 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
4025 NULL, NULL);
4026 foffset = auio.uio_offset;
4027 } else
4028 # endif
4029 {
4030 kuio = auio;
4031 kuio.uio_iov = &kiov;
4032 kuio.uio_segflg = UIO_SYSSPACE;
4033 kiov.iov_len = uap->count;
4034 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK);
4035 kiov.iov_base = dirbuf;
4036 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
4037 NULL, NULL);
4038 foffset = kuio.uio_offset;
4039 if (error == 0) {
4040 readcnt = uap->count - kuio.uio_resid;
4041 edp = (struct dirent *)&dirbuf[readcnt];
4042 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
4043 # if (BYTE_ORDER == LITTLE_ENDIAN)
4044 /*
4045 * The expected low byte of
4046 * dp->d_namlen is our dp->d_type.
4047 * The high MBZ byte of dp->d_namlen
4048 * is our dp->d_namlen.
4049 */
4050 dp->d_type = dp->d_namlen;
4051 dp->d_namlen = 0;
4052 # else
4053 /*
4054 * The dp->d_type is the high byte
4055 * of the expected dp->d_namlen,
4056 * so must be zero'ed.
4057 */
4058 dp->d_type = 0;
4059 # endif
4060 if (dp->d_reclen > 0) {
4061 dp = (struct dirent *)
4062 ((char *)dp + dp->d_reclen);
4063 } else {
4064 error = EIO;
4065 break;
4066 }
4067 }
4068 if (dp >= edp)
4069 error = uiomove(dirbuf, readcnt, &auio);
4070 }
4071 free(dirbuf, M_TEMP);
4072 }
4073 if (error != 0) {
4074 VOP_UNLOCK(vp, 0);
4075 foffset_unlock(fp, foffset, 0);
4076 fdrop(fp, td);
4077 return (error);
4078 }
4079 if (uap->count == auio.uio_resid &&
4080 (vp->v_vflag & VV_ROOT) &&
4081 (vp->v_mount->mnt_flag & MNT_UNION)) {
4082 struct vnode *tvp = vp;
4083 vp = vp->v_mount->mnt_vnodecovered;
4084 VREF(vp);
4085 fp->f_vnode = vp;
4086 fp->f_data = vp;
4087 foffset = 0;
4088 vput(tvp);
4089 goto unionread;
4090 }
4091 VOP_UNLOCK(vp, 0);
4092 foffset_unlock(fp, foffset, 0);
4093 fdrop(fp, td);
4094 td->td_retval[0] = uap->count - auio.uio_resid;
4095 if (error == 0)
4096 *ploff = loff;
4097 return (error);
4098 }
4099 #endif /* COMPAT_43 */
4100
4101 /*
4102 * Read a block of directory entries in a filesystem independent format.
4103 */
4104 #ifndef _SYS_SYSPROTO_H_
4105 struct getdirentries_args {
4106 int fd;
4107 char *buf;
4108 u_int count;
4109 long *basep;
4110 };
4111 #endif
4112 int
sys_getdirentries(td,uap)4113 sys_getdirentries(td, uap)
4114 struct thread *td;
4115 register struct getdirentries_args /* {
4116 int fd;
4117 char *buf;
4118 u_int count;
4119 long *basep;
4120 } */ *uap;
4121 {
4122 long base;
4123 int error;
4124
4125 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
4126 NULL, UIO_USERSPACE);
4127 if (error != 0)
4128 return (error);
4129 if (uap->basep != NULL)
4130 error = copyout(&base, uap->basep, sizeof(long));
4131 return (error);
4132 }
4133
4134 int
kern_getdirentries(struct thread * td,int fd,char * buf,u_int count,long * basep,ssize_t * residp,enum uio_seg bufseg)4135 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count,
4136 long *basep, ssize_t *residp, enum uio_seg bufseg)
4137 {
4138 struct vnode *vp;
4139 struct file *fp;
4140 struct uio auio;
4141 struct iovec aiov;
4142 cap_rights_t rights;
4143 long loff;
4144 int error, eofflag;
4145 off_t foffset;
4146
4147 AUDIT_ARG_FD(fd);
4148 if (count > IOSIZE_MAX)
4149 return (EINVAL);
4150 auio.uio_resid = count;
4151 error = getvnode(td->td_proc->p_fd, fd,
4152 cap_rights_init(&rights, CAP_READ), &fp);
4153 if (error != 0)
4154 return (error);
4155 if ((fp->f_flag & FREAD) == 0) {
4156 fdrop(fp, td);
4157 return (EBADF);
4158 }
4159 vp = fp->f_vnode;
4160 foffset = foffset_lock(fp, 0);
4161 unionread:
4162 if (vp->v_type != VDIR) {
4163 error = EINVAL;
4164 goto fail;
4165 }
4166 aiov.iov_base = buf;
4167 aiov.iov_len = count;
4168 auio.uio_iov = &aiov;
4169 auio.uio_iovcnt = 1;
4170 auio.uio_rw = UIO_READ;
4171 auio.uio_segflg = bufseg;
4172 auio.uio_td = td;
4173 vn_lock(vp, LK_SHARED | LK_RETRY);
4174 AUDIT_ARG_VNODE1(vp);
4175 loff = auio.uio_offset = foffset;
4176 #ifdef MAC
4177 error = mac_vnode_check_readdir(td->td_ucred, vp);
4178 if (error == 0)
4179 #endif
4180 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4181 NULL);
4182 foffset = auio.uio_offset;
4183 if (error != 0) {
4184 VOP_UNLOCK(vp, 0);
4185 goto fail;
4186 }
4187 if (count == auio.uio_resid &&
4188 (vp->v_vflag & VV_ROOT) &&
4189 (vp->v_mount->mnt_flag & MNT_UNION)) {
4190 struct vnode *tvp = vp;
4191
4192 vp = vp->v_mount->mnt_vnodecovered;
4193 VREF(vp);
4194 fp->f_vnode = vp;
4195 fp->f_data = vp;
4196 foffset = 0;
4197 vput(tvp);
4198 goto unionread;
4199 }
4200 VOP_UNLOCK(vp, 0);
4201 *basep = loff;
4202 if (residp != NULL)
4203 *residp = auio.uio_resid;
4204 td->td_retval[0] = count - auio.uio_resid;
4205 fail:
4206 foffset_unlock(fp, foffset, 0);
4207 fdrop(fp, td);
4208 return (error);
4209 }
4210
4211 #ifndef _SYS_SYSPROTO_H_
4212 struct getdents_args {
4213 int fd;
4214 char *buf;
4215 size_t count;
4216 };
4217 #endif
4218 int
sys_getdents(td,uap)4219 sys_getdents(td, uap)
4220 struct thread *td;
4221 register struct getdents_args /* {
4222 int fd;
4223 char *buf;
4224 u_int count;
4225 } */ *uap;
4226 {
4227 struct getdirentries_args ap;
4228
4229 ap.fd = uap->fd;
4230 ap.buf = uap->buf;
4231 ap.count = uap->count;
4232 ap.basep = NULL;
4233 return (sys_getdirentries(td, &ap));
4234 }
4235
4236 /*
4237 * Set the mode mask for creation of filesystem nodes.
4238 */
4239 #ifndef _SYS_SYSPROTO_H_
4240 struct umask_args {
4241 int newmask;
4242 };
4243 #endif
4244 int
sys_umask(td,uap)4245 sys_umask(td, uap)
4246 struct thread *td;
4247 struct umask_args /* {
4248 int newmask;
4249 } */ *uap;
4250 {
4251 register struct filedesc *fdp;
4252
4253 FILEDESC_XLOCK(td->td_proc->p_fd);
4254 fdp = td->td_proc->p_fd;
4255 td->td_retval[0] = fdp->fd_cmask;
4256 fdp->fd_cmask = uap->newmask & ALLPERMS;
4257 FILEDESC_XUNLOCK(td->td_proc->p_fd);
4258 return (0);
4259 }
4260
4261 /*
4262 * Void all references to file by ripping underlying filesystem away from
4263 * vnode.
4264 */
4265 #ifndef _SYS_SYSPROTO_H_
4266 struct revoke_args {
4267 char *path;
4268 };
4269 #endif
4270 int
sys_revoke(td,uap)4271 sys_revoke(td, uap)
4272 struct thread *td;
4273 register struct revoke_args /* {
4274 char *path;
4275 } */ *uap;
4276 {
4277 struct vnode *vp;
4278 struct vattr vattr;
4279 struct nameidata nd;
4280 int error;
4281
4282 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4283 uap->path, td);
4284 if ((error = namei(&nd)) != 0)
4285 return (error);
4286 vp = nd.ni_vp;
4287 NDFREE(&nd, NDF_ONLY_PNBUF);
4288 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4289 error = EINVAL;
4290 goto out;
4291 }
4292 #ifdef MAC
4293 error = mac_vnode_check_revoke(td->td_ucred, vp);
4294 if (error != 0)
4295 goto out;
4296 #endif
4297 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4298 if (error != 0)
4299 goto out;
4300 if (td->td_ucred->cr_uid != vattr.va_uid) {
4301 error = priv_check(td, PRIV_VFS_ADMIN);
4302 if (error != 0)
4303 goto out;
4304 }
4305 if (vcount(vp) > 1)
4306 VOP_REVOKE(vp, REVOKEALL);
4307 out:
4308 vput(vp);
4309 return (error);
4310 }
4311
4312 /*
4313 * Convert a user file descriptor to a kernel file entry and check that, if it
4314 * is a capability, the correct rights are present. A reference on the file
4315 * entry is held upon returning.
4316 */
4317 int
getvnode(struct filedesc * fdp,int fd,cap_rights_t * rightsp,struct file ** fpp)4318 getvnode(struct filedesc *fdp, int fd, cap_rights_t *rightsp, struct file **fpp)
4319 {
4320 struct file *fp;
4321 int error;
4322
4323 error = fget_unlocked(fdp, fd, rightsp, 0, &fp, NULL);
4324 if (error != 0)
4325 return (error);
4326
4327 /*
4328 * The file could be not of the vnode type, or it may be not
4329 * yet fully initialized, in which case the f_vnode pointer
4330 * may be set, but f_ops is still badfileops. E.g.,
4331 * devfs_open() transiently create such situation to
4332 * facilitate csw d_fdopen().
4333 *
4334 * Dupfdopen() handling in kern_openat() installs the
4335 * half-baked file into the process descriptor table, allowing
4336 * other thread to dereference it. Guard against the race by
4337 * checking f_ops.
4338 */
4339 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
4340 fdrop(fp, curthread);
4341 return (EINVAL);
4342 }
4343 *fpp = fp;
4344 return (0);
4345 }
4346
4347
4348 /*
4349 * Get an (NFS) file handle.
4350 */
4351 #ifndef _SYS_SYSPROTO_H_
4352 struct lgetfh_args {
4353 char *fname;
4354 fhandle_t *fhp;
4355 };
4356 #endif
4357 int
sys_lgetfh(td,uap)4358 sys_lgetfh(td, uap)
4359 struct thread *td;
4360 register struct lgetfh_args *uap;
4361 {
4362 struct nameidata nd;
4363 fhandle_t fh;
4364 register struct vnode *vp;
4365 int error;
4366
4367 error = priv_check(td, PRIV_VFS_GETFH);
4368 if (error != 0)
4369 return (error);
4370 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4371 uap->fname, td);
4372 error = namei(&nd);
4373 if (error != 0)
4374 return (error);
4375 NDFREE(&nd, NDF_ONLY_PNBUF);
4376 vp = nd.ni_vp;
4377 bzero(&fh, sizeof(fh));
4378 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4379 error = VOP_VPTOFH(vp, &fh.fh_fid);
4380 vput(vp);
4381 if (error == 0)
4382 error = copyout(&fh, uap->fhp, sizeof (fh));
4383 return (error);
4384 }
4385
4386 #ifndef _SYS_SYSPROTO_H_
4387 struct getfh_args {
4388 char *fname;
4389 fhandle_t *fhp;
4390 };
4391 #endif
4392 int
sys_getfh(td,uap)4393 sys_getfh(td, uap)
4394 struct thread *td;
4395 register struct getfh_args *uap;
4396 {
4397 struct nameidata nd;
4398 fhandle_t fh;
4399 register struct vnode *vp;
4400 int error;
4401
4402 error = priv_check(td, PRIV_VFS_GETFH);
4403 if (error != 0)
4404 return (error);
4405 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4406 uap->fname, td);
4407 error = namei(&nd);
4408 if (error != 0)
4409 return (error);
4410 NDFREE(&nd, NDF_ONLY_PNBUF);
4411 vp = nd.ni_vp;
4412 bzero(&fh, sizeof(fh));
4413 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4414 error = VOP_VPTOFH(vp, &fh.fh_fid);
4415 vput(vp);
4416 if (error == 0)
4417 error = copyout(&fh, uap->fhp, sizeof (fh));
4418 return (error);
4419 }
4420
4421 /*
4422 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4423 * open descriptor.
4424 *
4425 * warning: do not remove the priv_check() call or this becomes one giant
4426 * security hole.
4427 */
4428 #ifndef _SYS_SYSPROTO_H_
4429 struct fhopen_args {
4430 const struct fhandle *u_fhp;
4431 int flags;
4432 };
4433 #endif
4434 int
sys_fhopen(td,uap)4435 sys_fhopen(td, uap)
4436 struct thread *td;
4437 struct fhopen_args /* {
4438 const struct fhandle *u_fhp;
4439 int flags;
4440 } */ *uap;
4441 {
4442 struct mount *mp;
4443 struct vnode *vp;
4444 struct fhandle fhp;
4445 struct file *fp;
4446 int fmode, error;
4447 int indx;
4448
4449 error = priv_check(td, PRIV_VFS_FHOPEN);
4450 if (error != 0)
4451 return (error);
4452 indx = -1;
4453 fmode = FFLAGS(uap->flags);
4454 /* why not allow a non-read/write open for our lockd? */
4455 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4456 return (EINVAL);
4457 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
4458 if (error != 0)
4459 return(error);
4460 /* find the mount point */
4461 mp = vfs_busyfs(&fhp.fh_fsid);
4462 if (mp == NULL)
4463 return (ESTALE);
4464 /* now give me my vnode, it gets returned to me locked */
4465 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4466 vfs_unbusy(mp);
4467 if (error != 0)
4468 return (error);
4469
4470 error = falloc_noinstall(td, &fp);
4471 if (error != 0) {
4472 vput(vp);
4473 return (error);
4474 }
4475 /*
4476 * An extra reference on `fp' has been held for us by
4477 * falloc_noinstall().
4478 */
4479
4480 #ifdef INVARIANTS
4481 td->td_dupfd = -1;
4482 #endif
4483 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4484 if (error != 0) {
4485 KASSERT(fp->f_ops == &badfileops,
4486 ("VOP_OPEN in fhopen() set f_ops"));
4487 KASSERT(td->td_dupfd < 0,
4488 ("fhopen() encountered fdopen()"));
4489
4490 vput(vp);
4491 goto bad;
4492 }
4493 #ifdef INVARIANTS
4494 td->td_dupfd = 0;
4495 #endif
4496 fp->f_vnode = vp;
4497 fp->f_seqcount = 1;
4498 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
4499 &vnops);
4500 VOP_UNLOCK(vp, 0);
4501 if ((fmode & O_TRUNC) != 0) {
4502 error = fo_truncate(fp, 0, td->td_ucred, td);
4503 if (error != 0)
4504 goto bad;
4505 }
4506
4507 error = finstall(td, fp, &indx, fmode, NULL);
4508 bad:
4509 fdrop(fp, td);
4510 td->td_retval[0] = indx;
4511 return (error);
4512 }
4513
4514 /*
4515 * Stat an (NFS) file handle.
4516 */
4517 #ifndef _SYS_SYSPROTO_H_
4518 struct fhstat_args {
4519 struct fhandle *u_fhp;
4520 struct stat *sb;
4521 };
4522 #endif
4523 int
sys_fhstat(td,uap)4524 sys_fhstat(td, uap)
4525 struct thread *td;
4526 register struct fhstat_args /* {
4527 struct fhandle *u_fhp;
4528 struct stat *sb;
4529 } */ *uap;
4530 {
4531 struct stat sb;
4532 struct fhandle fh;
4533 int error;
4534
4535 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4536 if (error != 0)
4537 return (error);
4538 error = kern_fhstat(td, fh, &sb);
4539 if (error == 0)
4540 error = copyout(&sb, uap->sb, sizeof(sb));
4541 return (error);
4542 }
4543
4544 int
kern_fhstat(struct thread * td,struct fhandle fh,struct stat * sb)4545 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4546 {
4547 struct mount *mp;
4548 struct vnode *vp;
4549 int error;
4550
4551 error = priv_check(td, PRIV_VFS_FHSTAT);
4552 if (error != 0)
4553 return (error);
4554 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4555 return (ESTALE);
4556 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4557 vfs_unbusy(mp);
4558 if (error != 0)
4559 return (error);
4560 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
4561 vput(vp);
4562 return (error);
4563 }
4564
4565 /*
4566 * Implement fstatfs() for (NFS) file handles.
4567 */
4568 #ifndef _SYS_SYSPROTO_H_
4569 struct fhstatfs_args {
4570 struct fhandle *u_fhp;
4571 struct statfs *buf;
4572 };
4573 #endif
4574 int
sys_fhstatfs(td,uap)4575 sys_fhstatfs(td, uap)
4576 struct thread *td;
4577 struct fhstatfs_args /* {
4578 struct fhandle *u_fhp;
4579 struct statfs *buf;
4580 } */ *uap;
4581 {
4582 struct statfs sf;
4583 fhandle_t fh;
4584 int error;
4585
4586 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4587 if (error != 0)
4588 return (error);
4589 error = kern_fhstatfs(td, fh, &sf);
4590 if (error != 0)
4591 return (error);
4592 return (copyout(&sf, uap->buf, sizeof(sf)));
4593 }
4594
4595 int
kern_fhstatfs(struct thread * td,fhandle_t fh,struct statfs * buf)4596 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4597 {
4598 struct statfs *sp;
4599 struct mount *mp;
4600 struct vnode *vp;
4601 int error;
4602
4603 error = priv_check(td, PRIV_VFS_FHSTATFS);
4604 if (error != 0)
4605 return (error);
4606 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4607 return (ESTALE);
4608 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4609 if (error != 0) {
4610 vfs_unbusy(mp);
4611 return (error);
4612 }
4613 vput(vp);
4614 error = prison_canseemount(td->td_ucred, mp);
4615 if (error != 0)
4616 goto out;
4617 #ifdef MAC
4618 error = mac_mount_check_stat(td->td_ucred, mp);
4619 if (error != 0)
4620 goto out;
4621 #endif
4622 /*
4623 * Set these in case the underlying filesystem fails to do so.
4624 */
4625 sp = &mp->mnt_stat;
4626 sp->f_version = STATFS_VERSION;
4627 sp->f_namemax = NAME_MAX;
4628 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4629 error = VFS_STATFS(mp, sp);
4630 if (error == 0)
4631 *buf = *sp;
4632 out:
4633 vfs_unbusy(mp);
4634 return (error);
4635 }
4636
4637 int
kern_posix_fallocate(struct thread * td,int fd,off_t offset,off_t len)4638 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
4639 {
4640 struct file *fp;
4641 struct mount *mp;
4642 struct vnode *vp;
4643 cap_rights_t rights;
4644 off_t olen, ooffset;
4645 int error;
4646
4647 if (offset < 0 || len <= 0)
4648 return (EINVAL);
4649 /* Check for wrap. */
4650 if (offset > OFF_MAX - len)
4651 return (EFBIG);
4652 error = fget(td, fd, cap_rights_init(&rights, CAP_WRITE), &fp);
4653 if (error != 0)
4654 return (error);
4655 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4656 error = ESPIPE;
4657 goto out;
4658 }
4659 if ((fp->f_flag & FWRITE) == 0) {
4660 error = EBADF;
4661 goto out;
4662 }
4663 if (fp->f_type != DTYPE_VNODE) {
4664 error = ENODEV;
4665 goto out;
4666 }
4667 vp = fp->f_vnode;
4668 if (vp->v_type != VREG) {
4669 error = ENODEV;
4670 goto out;
4671 }
4672
4673 /* Allocating blocks may take a long time, so iterate. */
4674 for (;;) {
4675 olen = len;
4676 ooffset = offset;
4677
4678 bwillwrite();
4679 mp = NULL;
4680 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
4681 if (error != 0)
4682 break;
4683 error = vn_lock(vp, LK_EXCLUSIVE);
4684 if (error != 0) {
4685 vn_finished_write(mp);
4686 break;
4687 }
4688 #ifdef MAC
4689 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
4690 if (error == 0)
4691 #endif
4692 error = VOP_ALLOCATE(vp, &offset, &len);
4693 VOP_UNLOCK(vp, 0);
4694 vn_finished_write(mp);
4695
4696 if (olen + ooffset != offset + len) {
4697 panic("offset + len changed from %jx/%jx to %jx/%jx",
4698 ooffset, olen, offset, len);
4699 }
4700 if (error != 0 || len == 0)
4701 break;
4702 KASSERT(olen > len, ("Iteration did not make progress?"));
4703 maybe_yield();
4704 }
4705 out:
4706 fdrop(fp, td);
4707 return (error);
4708 }
4709
4710 int
sys_posix_fallocate(struct thread * td,struct posix_fallocate_args * uap)4711 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
4712 {
4713
4714 td->td_retval[0] = kern_posix_fallocate(td, uap->fd, uap->offset,
4715 uap->len);
4716 return (0);
4717 }
4718
4719 /*
4720 * Unlike madvise(2), we do not make a best effort to remember every
4721 * possible caching hint. Instead, we remember the last setting with
4722 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4723 * region of any current setting.
4724 */
4725 int
kern_posix_fadvise(struct thread * td,int fd,off_t offset,off_t len,int advice)4726 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4727 int advice)
4728 {
4729 struct fadvise_info *fa, *new;
4730 struct file *fp;
4731 struct vnode *vp;
4732 cap_rights_t rights;
4733 off_t end;
4734 int error;
4735
4736 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4737 return (EINVAL);
4738 switch (advice) {
4739 case POSIX_FADV_SEQUENTIAL:
4740 case POSIX_FADV_RANDOM:
4741 case POSIX_FADV_NOREUSE:
4742 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4743 break;
4744 case POSIX_FADV_NORMAL:
4745 case POSIX_FADV_WILLNEED:
4746 case POSIX_FADV_DONTNEED:
4747 new = NULL;
4748 break;
4749 default:
4750 return (EINVAL);
4751 }
4752 /* XXX: CAP_POSIX_FADVISE? */
4753 error = fget(td, fd, cap_rights_init(&rights), &fp);
4754 if (error != 0)
4755 goto out;
4756 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4757 error = ESPIPE;
4758 goto out;
4759 }
4760 if (fp->f_type != DTYPE_VNODE) {
4761 error = ENODEV;
4762 goto out;
4763 }
4764 vp = fp->f_vnode;
4765 if (vp->v_type != VREG) {
4766 error = ENODEV;
4767 goto out;
4768 }
4769 if (len == 0)
4770 end = OFF_MAX;
4771 else
4772 end = offset + len - 1;
4773 switch (advice) {
4774 case POSIX_FADV_SEQUENTIAL:
4775 case POSIX_FADV_RANDOM:
4776 case POSIX_FADV_NOREUSE:
4777 /*
4778 * Try to merge any existing non-standard region with
4779 * this new region if possible, otherwise create a new
4780 * non-standard region for this request.
4781 */
4782 mtx_pool_lock(mtxpool_sleep, fp);
4783 fa = fp->f_advice;
4784 if (fa != NULL && fa->fa_advice == advice &&
4785 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4786 (end != OFF_MAX && fa->fa_start == end + 1) ||
4787 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4788 if (offset < fa->fa_start)
4789 fa->fa_start = offset;
4790 if (end > fa->fa_end)
4791 fa->fa_end = end;
4792 } else {
4793 new->fa_advice = advice;
4794 new->fa_start = offset;
4795 new->fa_end = end;
4796 new->fa_prevstart = 0;
4797 new->fa_prevend = 0;
4798 fp->f_advice = new;
4799 new = fa;
4800 }
4801 mtx_pool_unlock(mtxpool_sleep, fp);
4802 break;
4803 case POSIX_FADV_NORMAL:
4804 /*
4805 * If a the "normal" region overlaps with an existing
4806 * non-standard region, trim or remove the
4807 * non-standard region.
4808 */
4809 mtx_pool_lock(mtxpool_sleep, fp);
4810 fa = fp->f_advice;
4811 if (fa != NULL) {
4812 if (offset <= fa->fa_start && end >= fa->fa_end) {
4813 new = fa;
4814 fp->f_advice = NULL;
4815 } else if (offset <= fa->fa_start &&
4816 end >= fa->fa_start)
4817 fa->fa_start = end + 1;
4818 else if (offset <= fa->fa_end && end >= fa->fa_end)
4819 fa->fa_end = offset - 1;
4820 else if (offset >= fa->fa_start && end <= fa->fa_end) {
4821 /*
4822 * If the "normal" region is a middle
4823 * portion of the existing
4824 * non-standard region, just remove
4825 * the whole thing rather than picking
4826 * one side or the other to
4827 * preserve.
4828 */
4829 new = fa;
4830 fp->f_advice = NULL;
4831 }
4832 }
4833 mtx_pool_unlock(mtxpool_sleep, fp);
4834 break;
4835 case POSIX_FADV_WILLNEED:
4836 case POSIX_FADV_DONTNEED:
4837 error = VOP_ADVISE(vp, offset, end, advice);
4838 break;
4839 }
4840 out:
4841 if (fp != NULL)
4842 fdrop(fp, td);
4843 free(new, M_FADVISE);
4844 return (error);
4845 }
4846
4847 int
sys_posix_fadvise(struct thread * td,struct posix_fadvise_args * uap)4848 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4849 {
4850
4851 td->td_retval[0] = kern_posix_fadvise(td, uap->fd, uap->offset,
4852 uap->len, uap->advice);
4853 return (0);
4854 }
4855