1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/10.1/sys/kern/vfs_syscalls.c 301050 2016-05-31 16:55:41Z glebius $");
39
40 #include "opt_capsicum.h"
41 #include "opt_compat.h"
42 #include "opt_kdtrace.h"
43 #include "opt_ktrace.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/bio.h>
48 #include <sys/buf.h>
49 #include <sys/capability.h>
50 #include <sys/disk.h>
51 #include <sys/sysent.h>
52 #include <sys/malloc.h>
53 #include <sys/mount.h>
54 #include <sys/mutex.h>
55 #include <sys/sysproto.h>
56 #include <sys/namei.h>
57 #include <sys/filedesc.h>
58 #include <sys/kernel.h>
59 #include <sys/fcntl.h>
60 #include <sys/file.h>
61 #include <sys/filio.h>
62 #include <sys/limits.h>
63 #include <sys/linker.h>
64 #include <sys/rwlock.h>
65 #include <sys/sdt.h>
66 #include <sys/stat.h>
67 #include <sys/sx.h>
68 #include <sys/unistd.h>
69 #include <sys/vnode.h>
70 #include <sys/priv.h>
71 #include <sys/proc.h>
72 #include <sys/dirent.h>
73 #include <sys/jail.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysctl.h>
76 #ifdef KTRACE
77 #include <sys/ktrace.h>
78 #endif
79
80 #include <machine/stdarg.h>
81
82 #include <security/audit/audit.h>
83 #include <security/mac/mac_framework.h>
84
85 #include <vm/vm.h>
86 #include <vm/vm_object.h>
87 #include <vm/vm_page.h>
88 #include <vm/uma.h>
89
90 #include <ufs/ufs/quota.h>
91
92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
93
94 SDT_PROVIDER_DEFINE(vfs);
95 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int");
96 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int");
97
98 static int chroot_refuse_vdir_fds(struct filedesc *fdp);
99 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
100 static int kern_chflags(struct thread *td, const char *path,
101 enum uio_seg pathseg, u_long flags);
102 static int kern_chflagsat(struct thread *td, int fd, const char *path,
103 enum uio_seg pathseg, u_long flags, int atflag);
104 static int setfflags(struct thread *td, struct vnode *, u_long);
105 static int setutimes(struct thread *td, struct vnode *,
106 const struct timespec *, int, int);
107 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
108 struct thread *td);
109
110 /*
111 * The module initialization routine for POSIX asynchronous I/O will
112 * set this to the version of AIO that it implements. (Zero means
113 * that it is not implemented.) This value is used here by pathconf()
114 * and in kern_descrip.c by fpathconf().
115 */
116 int async_io_version;
117
118 #ifdef DEBUG
119 static int syncprt = 0;
120 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
121 #endif
122
123 /*
124 * Sync each mounted filesystem.
125 */
126 #ifndef _SYS_SYSPROTO_H_
127 struct sync_args {
128 int dummy;
129 };
130 #endif
131 /* ARGSUSED */
132 int
133 sys_sync(td, uap)
134 struct thread *td;
135 struct sync_args *uap;
136 {
137 struct mount *mp, *nmp;
138 int save;
139
140 mtx_lock(&mountlist_mtx);
141 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
142 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
143 nmp = TAILQ_NEXT(mp, mnt_list);
144 continue;
145 }
146 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
147 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
148 save = curthread_pflags_set(TDP_SYNCIO);
149 vfs_msync(mp, MNT_NOWAIT);
150 VFS_SYNC(mp, MNT_NOWAIT);
151 curthread_pflags_restore(save);
152 vn_finished_write(mp);
153 }
154 mtx_lock(&mountlist_mtx);
155 nmp = TAILQ_NEXT(mp, mnt_list);
156 vfs_unbusy(mp);
157 }
158 mtx_unlock(&mountlist_mtx);
159 return (0);
160 }
161
162 /*
163 * Change filesystem quotas.
164 */
165 #ifndef _SYS_SYSPROTO_H_
166 struct quotactl_args {
167 char *path;
168 int cmd;
169 int uid;
170 caddr_t arg;
171 };
172 #endif
173 int
174 sys_quotactl(td, uap)
175 struct thread *td;
176 register struct quotactl_args /* {
177 char *path;
178 int cmd;
179 int uid;
180 caddr_t arg;
181 } */ *uap;
182 {
183 struct mount *mp;
184 struct nameidata nd;
185 int error;
186
187 AUDIT_ARG_CMD(uap->cmd);
188 AUDIT_ARG_UID(uap->uid);
189 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
190 return (EPERM);
191 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
192 uap->path, td);
193 if ((error = namei(&nd)) != 0)
194 return (error);
195 NDFREE(&nd, NDF_ONLY_PNBUF);
196 mp = nd.ni_vp->v_mount;
197 vfs_ref(mp);
198 vput(nd.ni_vp);
199 error = vfs_busy(mp, 0);
200 vfs_rel(mp);
201 if (error != 0)
202 return (error);
203 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
204
205 /*
206 * Since quota on operation typically needs to open quota
207 * file, the Q_QUOTAON handler needs to unbusy the mount point
208 * before calling into namei. Otherwise, unmount might be
209 * started between two vfs_busy() invocations (first is our,
210 * second is from mount point cross-walk code in lookup()),
211 * causing deadlock.
212 *
213 * Require that Q_QUOTAON handles the vfs_busy() reference on
214 * its own, always returning with ubusied mount point.
215 */
216 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON)
217 vfs_unbusy(mp);
218 return (error);
219 }
220
221 /*
222 * Used by statfs conversion routines to scale the block size up if
223 * necessary so that all of the block counts are <= 'max_size'. Note
224 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
225 * value of 'n'.
226 */
227 void
228 statfs_scale_blocks(struct statfs *sf, long max_size)
229 {
230 uint64_t count;
231 int shift;
232
233 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
234
235 /*
236 * Attempt to scale the block counts to give a more accurate
237 * overview to userland of the ratio of free space to used
238 * space. To do this, find the largest block count and compute
239 * a divisor that lets it fit into a signed integer <= max_size.
240 */
241 if (sf->f_bavail < 0)
242 count = -sf->f_bavail;
243 else
244 count = sf->f_bavail;
245 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
246 if (count <= max_size)
247 return;
248
249 count >>= flsl(max_size);
250 shift = 0;
251 while (count > 0) {
252 shift++;
253 count >>=1;
254 }
255
256 sf->f_bsize <<= shift;
257 sf->f_blocks >>= shift;
258 sf->f_bfree >>= shift;
259 sf->f_bavail >>= shift;
260 }
261
262 /*
263 * Get filesystem statistics.
264 */
265 #ifndef _SYS_SYSPROTO_H_
266 struct statfs_args {
267 char *path;
268 struct statfs *buf;
269 };
270 #endif
271 int
272 sys_statfs(td, uap)
273 struct thread *td;
274 register struct statfs_args /* {
275 char *path;
276 struct statfs *buf;
277 } */ *uap;
278 {
279 struct statfs sf;
280 int error;
281
282 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
283 if (error == 0)
284 error = copyout(&sf, uap->buf, sizeof(sf));
285 return (error);
286 }
287
288 int
289 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
290 struct statfs *buf)
291 {
292 struct mount *mp;
293 struct statfs *sp, sb;
294 struct nameidata nd;
295 int error;
296
297 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
298 pathseg, path, td);
299 error = namei(&nd);
300 if (error != 0)
301 return (error);
302 mp = nd.ni_vp->v_mount;
303 vfs_ref(mp);
304 NDFREE(&nd, NDF_ONLY_PNBUF);
305 vput(nd.ni_vp);
306 error = vfs_busy(mp, 0);
307 vfs_rel(mp);
308 if (error != 0)
309 return (error);
310 #ifdef MAC
311 error = mac_mount_check_stat(td->td_ucred, mp);
312 if (error != 0)
313 goto out;
314 #endif
315 /*
316 * Set these in case the underlying filesystem fails to do so.
317 */
318 sp = &mp->mnt_stat;
319 sp->f_version = STATFS_VERSION;
320 sp->f_namemax = NAME_MAX;
321 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
322 error = VFS_STATFS(mp, sp);
323 if (error != 0)
324 goto out;
325 if (priv_check(td, PRIV_VFS_GENERATION)) {
326 bcopy(sp, &sb, sizeof(sb));
327 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
328 prison_enforce_statfs(td->td_ucred, mp, &sb);
329 sp = &sb;
330 }
331 *buf = *sp;
332 out:
333 vfs_unbusy(mp);
334 return (error);
335 }
336
337 /*
338 * Get filesystem statistics.
339 */
340 #ifndef _SYS_SYSPROTO_H_
341 struct fstatfs_args {
342 int fd;
343 struct statfs *buf;
344 };
345 #endif
346 int
347 sys_fstatfs(td, uap)
348 struct thread *td;
349 register struct fstatfs_args /* {
350 int fd;
351 struct statfs *buf;
352 } */ *uap;
353 {
354 struct statfs sf;
355 int error;
356
357 error = kern_fstatfs(td, uap->fd, &sf);
358 if (error == 0)
359 error = copyout(&sf, uap->buf, sizeof(sf));
360 return (error);
361 }
362
363 int
364 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
365 {
366 struct file *fp;
367 struct mount *mp;
368 struct statfs *sp, sb;
369 struct vnode *vp;
370 cap_rights_t rights;
371 int error;
372
373 AUDIT_ARG_FD(fd);
374 error = getvnode(td->td_proc->p_fd, fd,
375 cap_rights_init(&rights, CAP_FSTATFS), &fp);
376 if (error != 0)
377 return (error);
378 vp = fp->f_vnode;
379 vn_lock(vp, LK_SHARED | LK_RETRY);
380 #ifdef AUDIT
381 AUDIT_ARG_VNODE1(vp);
382 #endif
383 mp = vp->v_mount;
384 if (mp)
385 vfs_ref(mp);
386 VOP_UNLOCK(vp, 0);
387 fdrop(fp, td);
388 if (mp == NULL) {
389 error = EBADF;
390 goto out;
391 }
392 error = vfs_busy(mp, 0);
393 vfs_rel(mp);
394 if (error != 0)
395 return (error);
396 #ifdef MAC
397 error = mac_mount_check_stat(td->td_ucred, mp);
398 if (error != 0)
399 goto out;
400 #endif
401 /*
402 * Set these in case the underlying filesystem fails to do so.
403 */
404 sp = &mp->mnt_stat;
405 sp->f_version = STATFS_VERSION;
406 sp->f_namemax = NAME_MAX;
407 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
408 error = VFS_STATFS(mp, sp);
409 if (error != 0)
410 goto out;
411 if (priv_check(td, PRIV_VFS_GENERATION)) {
412 bcopy(sp, &sb, sizeof(sb));
413 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
414 prison_enforce_statfs(td->td_ucred, mp, &sb);
415 sp = &sb;
416 }
417 *buf = *sp;
418 out:
419 if (mp)
420 vfs_unbusy(mp);
421 return (error);
422 }
423
424 /*
425 * Get statistics on all filesystems.
426 */
427 #ifndef _SYS_SYSPROTO_H_
428 struct getfsstat_args {
429 struct statfs *buf;
430 long bufsize;
431 int flags;
432 };
433 #endif
434 int
435 sys_getfsstat(td, uap)
436 struct thread *td;
437 register struct getfsstat_args /* {
438 struct statfs *buf;
439 long bufsize;
440 int flags;
441 } */ *uap;
442 {
443
444 return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE,
445 uap->flags));
446 }
447
448 /*
449 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
450 * The caller is responsible for freeing memory which will be allocated
451 * in '*buf'.
452 */
453 int
454 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
455 enum uio_seg bufseg, int flags)
456 {
457 struct mount *mp, *nmp;
458 struct statfs *sfsp, *sp, sb;
459 size_t count, maxcount;
460 int error;
461
462 maxcount = bufsize / sizeof(struct statfs);
463 if (bufsize == 0)
464 sfsp = NULL;
465 else if (bufseg == UIO_USERSPACE)
466 sfsp = *buf;
467 else /* if (bufseg == UIO_SYSSPACE) */ {
468 count = 0;
469 mtx_lock(&mountlist_mtx);
470 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
471 count++;
472 }
473 mtx_unlock(&mountlist_mtx);
474 if (maxcount > count)
475 maxcount = count;
476 sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP,
477 M_WAITOK);
478 }
479 count = 0;
480 mtx_lock(&mountlist_mtx);
481 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
482 if (prison_canseemount(td->td_ucred, mp) != 0) {
483 nmp = TAILQ_NEXT(mp, mnt_list);
484 continue;
485 }
486 #ifdef MAC
487 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
488 nmp = TAILQ_NEXT(mp, mnt_list);
489 continue;
490 }
491 #endif
492 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
493 nmp = TAILQ_NEXT(mp, mnt_list);
494 continue;
495 }
496 if (sfsp && count < maxcount) {
497 sp = &mp->mnt_stat;
498 /*
499 * Set these in case the underlying filesystem
500 * fails to do so.
501 */
502 sp->f_version = STATFS_VERSION;
503 sp->f_namemax = NAME_MAX;
504 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
505 /*
506 * If MNT_NOWAIT or MNT_LAZY is specified, do not
507 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
508 * overrides MNT_WAIT.
509 */
510 if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
511 (flags & MNT_WAIT)) &&
512 (error = VFS_STATFS(mp, sp))) {
513 mtx_lock(&mountlist_mtx);
514 nmp = TAILQ_NEXT(mp, mnt_list);
515 vfs_unbusy(mp);
516 continue;
517 }
518 if (priv_check(td, PRIV_VFS_GENERATION)) {
519 bcopy(sp, &sb, sizeof(sb));
520 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
521 prison_enforce_statfs(td->td_ucred, mp, &sb);
522 sp = &sb;
523 }
524 if (bufseg == UIO_SYSSPACE)
525 bcopy(sp, sfsp, sizeof(*sp));
526 else /* if (bufseg == UIO_USERSPACE) */ {
527 error = copyout(sp, sfsp, sizeof(*sp));
528 if (error != 0) {
529 vfs_unbusy(mp);
530 return (error);
531 }
532 }
533 sfsp++;
534 }
535 count++;
536 mtx_lock(&mountlist_mtx);
537 nmp = TAILQ_NEXT(mp, mnt_list);
538 vfs_unbusy(mp);
539 }
540 mtx_unlock(&mountlist_mtx);
541 if (sfsp && count > maxcount)
542 td->td_retval[0] = maxcount;
543 else
544 td->td_retval[0] = count;
545 return (0);
546 }
547
548 #ifdef COMPAT_FREEBSD4
549 /*
550 * Get old format filesystem statistics.
551 */
552 static void cvtstatfs(struct statfs *, struct ostatfs *);
553
554 #ifndef _SYS_SYSPROTO_H_
555 struct freebsd4_statfs_args {
556 char *path;
557 struct ostatfs *buf;
558 };
559 #endif
560 int
561 freebsd4_statfs(td, uap)
562 struct thread *td;
563 struct freebsd4_statfs_args /* {
564 char *path;
565 struct ostatfs *buf;
566 } */ *uap;
567 {
568 struct ostatfs osb;
569 struct statfs sf;
570 int error;
571
572 error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf);
573 if (error != 0)
574 return (error);
575 cvtstatfs(&sf, &osb);
576 return (copyout(&osb, uap->buf, sizeof(osb)));
577 }
578
579 /*
580 * Get filesystem statistics.
581 */
582 #ifndef _SYS_SYSPROTO_H_
583 struct freebsd4_fstatfs_args {
584 int fd;
585 struct ostatfs *buf;
586 };
587 #endif
588 int
589 freebsd4_fstatfs(td, uap)
590 struct thread *td;
591 struct freebsd4_fstatfs_args /* {
592 int fd;
593 struct ostatfs *buf;
594 } */ *uap;
595 {
596 struct ostatfs osb;
597 struct statfs sf;
598 int error;
599
600 error = kern_fstatfs(td, uap->fd, &sf);
601 if (error != 0)
602 return (error);
603 cvtstatfs(&sf, &osb);
604 return (copyout(&osb, uap->buf, sizeof(osb)));
605 }
606
607 /*
608 * Get statistics on all filesystems.
609 */
610 #ifndef _SYS_SYSPROTO_H_
611 struct freebsd4_getfsstat_args {
612 struct ostatfs *buf;
613 long bufsize;
614 int flags;
615 };
616 #endif
617 int
618 freebsd4_getfsstat(td, uap)
619 struct thread *td;
620 register struct freebsd4_getfsstat_args /* {
621 struct ostatfs *buf;
622 long bufsize;
623 int flags;
624 } */ *uap;
625 {
626 struct statfs *buf, *sp;
627 struct ostatfs osb;
628 size_t count, size;
629 int error;
630
631 count = uap->bufsize / sizeof(struct ostatfs);
632 size = count * sizeof(struct statfs);
633 error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags);
634 if (size > 0) {
635 count = td->td_retval[0];
636 sp = buf;
637 while (count > 0 && error == 0) {
638 cvtstatfs(sp, &osb);
639 error = copyout(&osb, uap->buf, sizeof(osb));
640 sp++;
641 uap->buf++;
642 count--;
643 }
644 free(buf, M_TEMP);
645 }
646 return (error);
647 }
648
649 /*
650 * Implement fstatfs() for (NFS) file handles.
651 */
652 #ifndef _SYS_SYSPROTO_H_
653 struct freebsd4_fhstatfs_args {
654 struct fhandle *u_fhp;
655 struct ostatfs *buf;
656 };
657 #endif
658 int
659 freebsd4_fhstatfs(td, uap)
660 struct thread *td;
661 struct freebsd4_fhstatfs_args /* {
662 struct fhandle *u_fhp;
663 struct ostatfs *buf;
664 } */ *uap;
665 {
666 struct ostatfs osb;
667 struct statfs sf;
668 fhandle_t fh;
669 int error;
670
671 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
672 if (error != 0)
673 return (error);
674 error = kern_fhstatfs(td, fh, &sf);
675 if (error != 0)
676 return (error);
677 cvtstatfs(&sf, &osb);
678 return (copyout(&osb, uap->buf, sizeof(osb)));
679 }
680
681 /*
682 * Convert a new format statfs structure to an old format statfs structure.
683 */
684 static void
685 cvtstatfs(nsp, osp)
686 struct statfs *nsp;
687 struct ostatfs *osp;
688 {
689
690 statfs_scale_blocks(nsp, LONG_MAX);
691 bzero(osp, sizeof(*osp));
692 osp->f_bsize = nsp->f_bsize;
693 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
694 osp->f_blocks = nsp->f_blocks;
695 osp->f_bfree = nsp->f_bfree;
696 osp->f_bavail = nsp->f_bavail;
697 osp->f_files = MIN(nsp->f_files, LONG_MAX);
698 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
699 osp->f_owner = nsp->f_owner;
700 osp->f_type = nsp->f_type;
701 osp->f_flags = nsp->f_flags;
702 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
703 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
704 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
705 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
706 strlcpy(osp->f_fstypename, nsp->f_fstypename,
707 MIN(MFSNAMELEN, OMFSNAMELEN));
708 strlcpy(osp->f_mntonname, nsp->f_mntonname,
709 MIN(MNAMELEN, OMNAMELEN));
710 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
711 MIN(MNAMELEN, OMNAMELEN));
712 osp->f_fsid = nsp->f_fsid;
713 }
714 #endif /* COMPAT_FREEBSD4 */
715
716 /*
717 * Change current working directory to a given file descriptor.
718 */
719 #ifndef _SYS_SYSPROTO_H_
720 struct fchdir_args {
721 int fd;
722 };
723 #endif
724 int
725 sys_fchdir(td, uap)
726 struct thread *td;
727 struct fchdir_args /* {
728 int fd;
729 } */ *uap;
730 {
731 register struct filedesc *fdp = td->td_proc->p_fd;
732 struct vnode *vp, *tdp, *vpold;
733 struct mount *mp;
734 struct file *fp;
735 cap_rights_t rights;
736 int error;
737
738 AUDIT_ARG_FD(uap->fd);
739 error = getvnode(fdp, uap->fd, cap_rights_init(&rights, CAP_FCHDIR),
740 &fp);
741 if (error != 0)
742 return (error);
743 vp = fp->f_vnode;
744 VREF(vp);
745 fdrop(fp, td);
746 vn_lock(vp, LK_SHARED | LK_RETRY);
747 AUDIT_ARG_VNODE1(vp);
748 error = change_dir(vp, td);
749 while (!error && (mp = vp->v_mountedhere) != NULL) {
750 if (vfs_busy(mp, 0))
751 continue;
752 error = VFS_ROOT(mp, LK_SHARED, &tdp);
753 vfs_unbusy(mp);
754 if (error != 0)
755 break;
756 vput(vp);
757 vp = tdp;
758 }
759 if (error != 0) {
760 vput(vp);
761 return (error);
762 }
763 VOP_UNLOCK(vp, 0);
764 FILEDESC_XLOCK(fdp);
765 vpold = fdp->fd_cdir;
766 fdp->fd_cdir = vp;
767 FILEDESC_XUNLOCK(fdp);
768 vrele(vpold);
769 return (0);
770 }
771
772 /*
773 * Change current working directory (``.'').
774 */
775 #ifndef _SYS_SYSPROTO_H_
776 struct chdir_args {
777 char *path;
778 };
779 #endif
780 int
781 sys_chdir(td, uap)
782 struct thread *td;
783 struct chdir_args /* {
784 char *path;
785 } */ *uap;
786 {
787
788 return (kern_chdir(td, uap->path, UIO_USERSPACE));
789 }
790
791 int
792 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
793 {
794 register struct filedesc *fdp = td->td_proc->p_fd;
795 struct nameidata nd;
796 struct vnode *vp;
797 int error;
798
799 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
800 pathseg, path, td);
801 if ((error = namei(&nd)) != 0)
802 return (error);
803 if ((error = change_dir(nd.ni_vp, td)) != 0) {
804 vput(nd.ni_vp);
805 NDFREE(&nd, NDF_ONLY_PNBUF);
806 return (error);
807 }
808 VOP_UNLOCK(nd.ni_vp, 0);
809 NDFREE(&nd, NDF_ONLY_PNBUF);
810 FILEDESC_XLOCK(fdp);
811 vp = fdp->fd_cdir;
812 fdp->fd_cdir = nd.ni_vp;
813 FILEDESC_XUNLOCK(fdp);
814 vrele(vp);
815 return (0);
816 }
817
818 /*
819 * Helper function for raised chroot(2) security function: Refuse if
820 * any filedescriptors are open directories.
821 */
822 static int
823 chroot_refuse_vdir_fds(fdp)
824 struct filedesc *fdp;
825 {
826 struct vnode *vp;
827 struct file *fp;
828 int fd;
829
830 FILEDESC_LOCK_ASSERT(fdp);
831
832 for (fd = 0; fd <= fdp->fd_lastfile; fd++) {
833 fp = fget_locked(fdp, fd);
834 if (fp == NULL)
835 continue;
836 if (fp->f_type == DTYPE_VNODE) {
837 vp = fp->f_vnode;
838 if (vp->v_type == VDIR)
839 return (EPERM);
840 }
841 }
842 return (0);
843 }
844
845 /*
846 * This sysctl determines if we will allow a process to chroot(2) if it
847 * has a directory open:
848 * 0: disallowed for all processes.
849 * 1: allowed for processes that were not already chroot(2)'ed.
850 * 2: allowed for all processes.
851 */
852
853 static int chroot_allow_open_directories = 1;
854
855 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
856 &chroot_allow_open_directories, 0,
857 "Allow a process to chroot(2) if it has a directory open");
858
859 /*
860 * Change notion of root (``/'') directory.
861 */
862 #ifndef _SYS_SYSPROTO_H_
863 struct chroot_args {
864 char *path;
865 };
866 #endif
867 int
868 sys_chroot(td, uap)
869 struct thread *td;
870 struct chroot_args /* {
871 char *path;
872 } */ *uap;
873 {
874 struct nameidata nd;
875 int error;
876
877 error = priv_check(td, PRIV_VFS_CHROOT);
878 if (error != 0)
879 return (error);
880 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
881 UIO_USERSPACE, uap->path, td);
882 error = namei(&nd);
883 if (error != 0)
884 goto error;
885 error = change_dir(nd.ni_vp, td);
886 if (error != 0)
887 goto e_vunlock;
888 #ifdef MAC
889 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
890 if (error != 0)
891 goto e_vunlock;
892 #endif
893 VOP_UNLOCK(nd.ni_vp, 0);
894 error = change_root(nd.ni_vp, td);
895 vrele(nd.ni_vp);
896 NDFREE(&nd, NDF_ONLY_PNBUF);
897 return (error);
898 e_vunlock:
899 vput(nd.ni_vp);
900 error:
901 NDFREE(&nd, NDF_ONLY_PNBUF);
902 return (error);
903 }
904
905 /*
906 * Common routine for chroot and chdir. Callers must provide a locked vnode
907 * instance.
908 */
909 int
910 change_dir(vp, td)
911 struct vnode *vp;
912 struct thread *td;
913 {
914 #ifdef MAC
915 int error;
916 #endif
917
918 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
919 if (vp->v_type != VDIR)
920 return (ENOTDIR);
921 #ifdef MAC
922 error = mac_vnode_check_chdir(td->td_ucred, vp);
923 if (error != 0)
924 return (error);
925 #endif
926 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
927 }
928
929 /*
930 * Common routine for kern_chroot() and jail_attach(). The caller is
931 * responsible for invoking priv_check() and mac_vnode_check_chroot() to
932 * authorize this operation.
933 */
934 int
935 change_root(vp, td)
936 struct vnode *vp;
937 struct thread *td;
938 {
939 struct filedesc *fdp;
940 struct vnode *oldvp;
941 int error;
942
943 fdp = td->td_proc->p_fd;
944 FILEDESC_XLOCK(fdp);
945 if (chroot_allow_open_directories == 0 ||
946 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
947 error = chroot_refuse_vdir_fds(fdp);
948 if (error != 0) {
949 FILEDESC_XUNLOCK(fdp);
950 return (error);
951 }
952 }
953 oldvp = fdp->fd_rdir;
954 fdp->fd_rdir = vp;
955 VREF(fdp->fd_rdir);
956 if (!fdp->fd_jdir) {
957 fdp->fd_jdir = vp;
958 VREF(fdp->fd_jdir);
959 }
960 FILEDESC_XUNLOCK(fdp);
961 vrele(oldvp);
962 return (0);
963 }
964
965 static __inline void
966 flags_to_rights(int flags, cap_rights_t *rightsp)
967 {
968
969 if (flags & O_EXEC) {
970 cap_rights_set(rightsp, CAP_FEXECVE);
971 } else {
972 switch ((flags & O_ACCMODE)) {
973 case O_RDONLY:
974 cap_rights_set(rightsp, CAP_READ);
975 break;
976 case O_RDWR:
977 cap_rights_set(rightsp, CAP_READ);
978 /* FALLTHROUGH */
979 case O_WRONLY:
980 cap_rights_set(rightsp, CAP_WRITE);
981 if (!(flags & (O_APPEND | O_TRUNC)))
982 cap_rights_set(rightsp, CAP_SEEK);
983 break;
984 }
985 }
986
987 if (flags & O_CREAT)
988 cap_rights_set(rightsp, CAP_CREATE);
989
990 if (flags & O_TRUNC)
991 cap_rights_set(rightsp, CAP_FTRUNCATE);
992
993 if (flags & (O_SYNC | O_FSYNC))
994 cap_rights_set(rightsp, CAP_FSYNC);
995
996 if (flags & (O_EXLOCK | O_SHLOCK))
997 cap_rights_set(rightsp, CAP_FLOCK);
998 }
999
1000 /*
1001 * Check permissions, allocate an open file structure, and call the device
1002 * open routine if any.
1003 */
1004 #ifndef _SYS_SYSPROTO_H_
1005 struct open_args {
1006 char *path;
1007 int flags;
1008 int mode;
1009 };
1010 #endif
1011 int
1012 sys_open(td, uap)
1013 struct thread *td;
1014 register struct open_args /* {
1015 char *path;
1016 int flags;
1017 int mode;
1018 } */ *uap;
1019 {
1020
1021 return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
1022 }
1023
1024 #ifndef _SYS_SYSPROTO_H_
1025 struct openat_args {
1026 int fd;
1027 char *path;
1028 int flag;
1029 int mode;
1030 };
1031 #endif
1032 int
1033 sys_openat(struct thread *td, struct openat_args *uap)
1034 {
1035
1036 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1037 uap->mode));
1038 }
1039
1040 int
1041 kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
1042 int mode)
1043 {
1044
1045 return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode));
1046 }
1047
1048 int
1049 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1050 int flags, int mode)
1051 {
1052 struct proc *p = td->td_proc;
1053 struct filedesc *fdp = p->p_fd;
1054 struct file *fp;
1055 struct vnode *vp;
1056 struct nameidata nd;
1057 cap_rights_t rights;
1058 int cmode, error, indx;
1059
1060 indx = -1;
1061
1062 AUDIT_ARG_FFLAGS(flags);
1063 AUDIT_ARG_MODE(mode);
1064 /* XXX: audit dirfd */
1065 cap_rights_init(&rights, CAP_LOOKUP);
1066 flags_to_rights(flags, &rights);
1067 /*
1068 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1069 * may be specified.
1070 */
1071 if (flags & O_EXEC) {
1072 if (flags & O_ACCMODE)
1073 return (EINVAL);
1074 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1075 return (EINVAL);
1076 } else {
1077 flags = FFLAGS(flags);
1078 }
1079
1080 /*
1081 * Allocate the file descriptor, but don't install a descriptor yet.
1082 */
1083 error = falloc_noinstall(td, &fp);
1084 if (error != 0)
1085 return (error);
1086 /*
1087 * An extra reference on `fp' has been held for us by
1088 * falloc_noinstall().
1089 */
1090 /* Set the flags early so the finit in devfs can pick them up. */
1091 fp->f_flag = flags & FMASK;
1092 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
1093 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
1094 &rights, td);
1095 td->td_dupfd = -1; /* XXX check for fdopen */
1096 error = vn_open(&nd, &flags, cmode, fp);
1097 if (error != 0) {
1098 /*
1099 * If the vn_open replaced the method vector, something
1100 * wonderous happened deep below and we just pass it up
1101 * pretending we know what we do.
1102 */
1103 if (error == ENXIO && fp->f_ops != &badfileops)
1104 goto success;
1105
1106 /*
1107 * Handle special fdopen() case. bleh.
1108 *
1109 * Don't do this for relative (capability) lookups; we don't
1110 * understand exactly what would happen, and we don't think
1111 * that it ever should.
1112 */
1113 if (nd.ni_strictrelative == 0 &&
1114 (error == ENODEV || error == ENXIO) &&
1115 td->td_dupfd >= 0) {
1116 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1117 &indx);
1118 if (error == 0)
1119 goto success;
1120 }
1121
1122 goto bad;
1123 }
1124 td->td_dupfd = 0;
1125 NDFREE(&nd, NDF_ONLY_PNBUF);
1126 vp = nd.ni_vp;
1127
1128 /*
1129 * Store the vnode, for any f_type. Typically, the vnode use
1130 * count is decremented by direct call to vn_closefile() for
1131 * files that switched type in the cdevsw fdopen() method.
1132 */
1133 fp->f_vnode = vp;
1134 /*
1135 * If the file wasn't claimed by devfs bind it to the normal
1136 * vnode operations here.
1137 */
1138 if (fp->f_ops == &badfileops) {
1139 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
1140 fp->f_seqcount = 1;
1141 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK),
1142 DTYPE_VNODE, vp, &vnops);
1143 }
1144
1145 VOP_UNLOCK(vp, 0);
1146 if (flags & O_TRUNC) {
1147 error = fo_truncate(fp, 0, td->td_ucred, td);
1148 if (error != 0)
1149 goto bad;
1150 }
1151 success:
1152 /*
1153 * If we haven't already installed the FD (for dupfdopen), do so now.
1154 */
1155 if (indx == -1) {
1156 struct filecaps *fcaps;
1157
1158 #ifdef CAPABILITIES
1159 if (nd.ni_strictrelative == 1)
1160 fcaps = &nd.ni_filecaps;
1161 else
1162 #endif
1163 fcaps = NULL;
1164 error = finstall(td, fp, &indx, flags, fcaps);
1165 /* On success finstall() consumes fcaps. */
1166 if (error != 0) {
1167 filecaps_free(&nd.ni_filecaps);
1168 goto bad;
1169 }
1170 } else {
1171 filecaps_free(&nd.ni_filecaps);
1172 }
1173
1174 /*
1175 * Release our private reference, leaving the one associated with
1176 * the descriptor table intact.
1177 */
1178 fdrop(fp, td);
1179 td->td_retval[0] = indx;
1180 return (0);
1181 bad:
1182 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1183 fdrop(fp, td);
1184 return (error);
1185 }
1186
1187 #ifdef COMPAT_43
1188 /*
1189 * Create a file.
1190 */
1191 #ifndef _SYS_SYSPROTO_H_
1192 struct ocreat_args {
1193 char *path;
1194 int mode;
1195 };
1196 #endif
1197 int
1198 ocreat(td, uap)
1199 struct thread *td;
1200 register struct ocreat_args /* {
1201 char *path;
1202 int mode;
1203 } */ *uap;
1204 {
1205
1206 return (kern_open(td, uap->path, UIO_USERSPACE,
1207 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1208 }
1209 #endif /* COMPAT_43 */
1210
1211 /*
1212 * Create a special file.
1213 */
1214 #ifndef _SYS_SYSPROTO_H_
1215 struct mknod_args {
1216 char *path;
1217 int mode;
1218 int dev;
1219 };
1220 #endif
1221 int
1222 sys_mknod(td, uap)
1223 struct thread *td;
1224 register struct mknod_args /* {
1225 char *path;
1226 int mode;
1227 int dev;
1228 } */ *uap;
1229 {
1230
1231 return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
1232 }
1233
1234 #ifndef _SYS_SYSPROTO_H_
1235 struct mknodat_args {
1236 int fd;
1237 char *path;
1238 mode_t mode;
1239 dev_t dev;
1240 };
1241 #endif
1242 int
1243 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1244 {
1245
1246 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1247 uap->dev));
1248 }
1249
1250 int
1251 kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
1252 int dev)
1253 {
1254
1255 return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev));
1256 }
1257
1258 int
1259 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1260 int mode, int dev)
1261 {
1262 struct vnode *vp;
1263 struct mount *mp;
1264 struct vattr vattr;
1265 struct nameidata nd;
1266 cap_rights_t rights;
1267 int error, whiteout = 0;
1268
1269 AUDIT_ARG_MODE(mode);
1270 AUDIT_ARG_DEV(dev);
1271 switch (mode & S_IFMT) {
1272 case S_IFCHR:
1273 case S_IFBLK:
1274 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1275 break;
1276 case S_IFMT:
1277 error = priv_check(td, PRIV_VFS_MKNOD_BAD);
1278 break;
1279 case S_IFWHT:
1280 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1281 break;
1282 case S_IFIFO:
1283 if (dev == 0)
1284 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1285 /* FALLTHROUGH */
1286 default:
1287 error = EINVAL;
1288 break;
1289 }
1290 if (error != 0)
1291 return (error);
1292 restart:
1293 bwillwrite();
1294 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1,
1295 pathseg, path, fd, cap_rights_init(&rights, CAP_MKNODAT), td);
1296 if ((error = namei(&nd)) != 0)
1297 return (error);
1298 vp = nd.ni_vp;
1299 if (vp != NULL) {
1300 NDFREE(&nd, NDF_ONLY_PNBUF);
1301 if (vp == nd.ni_dvp)
1302 vrele(nd.ni_dvp);
1303 else
1304 vput(nd.ni_dvp);
1305 vrele(vp);
1306 return (EEXIST);
1307 } else {
1308 VATTR_NULL(&vattr);
1309 vattr.va_mode = (mode & ALLPERMS) &
1310 ~td->td_proc->p_fd->fd_cmask;
1311 vattr.va_rdev = dev;
1312 whiteout = 0;
1313
1314 switch (mode & S_IFMT) {
1315 case S_IFMT: /* used by badsect to flag bad sectors */
1316 vattr.va_type = VBAD;
1317 break;
1318 case S_IFCHR:
1319 vattr.va_type = VCHR;
1320 break;
1321 case S_IFBLK:
1322 vattr.va_type = VBLK;
1323 break;
1324 case S_IFWHT:
1325 whiteout = 1;
1326 break;
1327 default:
1328 panic("kern_mknod: invalid mode");
1329 }
1330 }
1331 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1332 NDFREE(&nd, NDF_ONLY_PNBUF);
1333 vput(nd.ni_dvp);
1334 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1335 return (error);
1336 goto restart;
1337 }
1338 #ifdef MAC
1339 if (error == 0 && !whiteout)
1340 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1341 &nd.ni_cnd, &vattr);
1342 #endif
1343 if (error == 0) {
1344 if (whiteout)
1345 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1346 else {
1347 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1348 &nd.ni_cnd, &vattr);
1349 if (error == 0)
1350 vput(nd.ni_vp);
1351 }
1352 }
1353 NDFREE(&nd, NDF_ONLY_PNBUF);
1354 vput(nd.ni_dvp);
1355 vn_finished_write(mp);
1356 return (error);
1357 }
1358
1359 /*
1360 * Create a named pipe.
1361 */
1362 #ifndef _SYS_SYSPROTO_H_
1363 struct mkfifo_args {
1364 char *path;
1365 int mode;
1366 };
1367 #endif
1368 int
1369 sys_mkfifo(td, uap)
1370 struct thread *td;
1371 register struct mkfifo_args /* {
1372 char *path;
1373 int mode;
1374 } */ *uap;
1375 {
1376
1377 return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
1378 }
1379
1380 #ifndef _SYS_SYSPROTO_H_
1381 struct mkfifoat_args {
1382 int fd;
1383 char *path;
1384 mode_t mode;
1385 };
1386 #endif
1387 int
1388 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1389 {
1390
1391 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1392 uap->mode));
1393 }
1394
1395 int
1396 kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
1397 {
1398
1399 return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode));
1400 }
1401
1402 int
1403 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1404 int mode)
1405 {
1406 struct mount *mp;
1407 struct vattr vattr;
1408 struct nameidata nd;
1409 cap_rights_t rights;
1410 int error;
1411
1412 AUDIT_ARG_MODE(mode);
1413 restart:
1414 bwillwrite();
1415 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1,
1416 pathseg, path, fd, cap_rights_init(&rights, CAP_MKFIFOAT), td);
1417 if ((error = namei(&nd)) != 0)
1418 return (error);
1419 if (nd.ni_vp != NULL) {
1420 NDFREE(&nd, NDF_ONLY_PNBUF);
1421 if (nd.ni_vp == nd.ni_dvp)
1422 vrele(nd.ni_dvp);
1423 else
1424 vput(nd.ni_dvp);
1425 vrele(nd.ni_vp);
1426 return (EEXIST);
1427 }
1428 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1429 NDFREE(&nd, NDF_ONLY_PNBUF);
1430 vput(nd.ni_dvp);
1431 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1432 return (error);
1433 goto restart;
1434 }
1435 VATTR_NULL(&vattr);
1436 vattr.va_type = VFIFO;
1437 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1438 #ifdef MAC
1439 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1440 &vattr);
1441 if (error != 0)
1442 goto out;
1443 #endif
1444 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1445 if (error == 0)
1446 vput(nd.ni_vp);
1447 #ifdef MAC
1448 out:
1449 #endif
1450 vput(nd.ni_dvp);
1451 vn_finished_write(mp);
1452 NDFREE(&nd, NDF_ONLY_PNBUF);
1453 return (error);
1454 }
1455
1456 /*
1457 * Make a hard file link.
1458 */
1459 #ifndef _SYS_SYSPROTO_H_
1460 struct link_args {
1461 char *path;
1462 char *link;
1463 };
1464 #endif
1465 int
1466 sys_link(td, uap)
1467 struct thread *td;
1468 register struct link_args /* {
1469 char *path;
1470 char *link;
1471 } */ *uap;
1472 {
1473
1474 return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
1475 }
1476
1477 #ifndef _SYS_SYSPROTO_H_
1478 struct linkat_args {
1479 int fd1;
1480 char *path1;
1481 int fd2;
1482 char *path2;
1483 int flag;
1484 };
1485 #endif
1486 int
1487 sys_linkat(struct thread *td, struct linkat_args *uap)
1488 {
1489 int flag;
1490
1491 flag = uap->flag;
1492 if (flag & ~AT_SYMLINK_FOLLOW)
1493 return (EINVAL);
1494
1495 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1496 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1497 }
1498
1499 int hardlink_check_uid = 0;
1500 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1501 &hardlink_check_uid, 0,
1502 "Unprivileged processes cannot create hard links to files owned by other "
1503 "users");
1504 static int hardlink_check_gid = 0;
1505 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1506 &hardlink_check_gid, 0,
1507 "Unprivileged processes cannot create hard links to files owned by other "
1508 "groups");
1509
1510 static int
1511 can_hardlink(struct vnode *vp, struct ucred *cred)
1512 {
1513 struct vattr va;
1514 int error;
1515
1516 if (!hardlink_check_uid && !hardlink_check_gid)
1517 return (0);
1518
1519 error = VOP_GETATTR(vp, &va, cred);
1520 if (error != 0)
1521 return (error);
1522
1523 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1524 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1525 if (error != 0)
1526 return (error);
1527 }
1528
1529 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1530 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1531 if (error != 0)
1532 return (error);
1533 }
1534
1535 return (0);
1536 }
1537
1538 int
1539 kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
1540 {
1541
1542 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW));
1543 }
1544
1545 int
1546 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1547 enum uio_seg segflg, int follow)
1548 {
1549 struct vnode *vp;
1550 struct mount *mp;
1551 struct nameidata nd;
1552 cap_rights_t rights;
1553 int error;
1554
1555 bwillwrite();
1556 NDINIT_AT(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1, td);
1557
1558 again:
1559 if ((error = namei(&nd)) != 0)
1560 return (error);
1561 NDFREE(&nd, NDF_ONLY_PNBUF);
1562 vp = nd.ni_vp;
1563 if (vp->v_type == VDIR) {
1564 vrele(vp);
1565 return (EPERM); /* POSIX */
1566 }
1567 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
1568 vrele(vp);
1569 return (error);
1570 }
1571 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE2,
1572 segflg, path2, fd2, cap_rights_init(&rights, CAP_LINKAT), td);
1573 if ((error = namei(&nd)) == 0) {
1574 if (nd.ni_vp != NULL) {
1575 if (nd.ni_dvp == nd.ni_vp)
1576 vrele(nd.ni_dvp);
1577 else
1578 vput(nd.ni_dvp);
1579 vrele(nd.ni_vp);
1580 error = EEXIST;
1581 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
1582 /*
1583 * Check for cross-device links. No need to
1584 * recheck vp->v_type, since it cannot change
1585 * for non-doomed vnode.
1586 */
1587 if (nd.ni_dvp->v_mount != vp->v_mount)
1588 error = EXDEV;
1589 else
1590 error = can_hardlink(vp, td->td_ucred);
1591 if (error == 0)
1592 #ifdef MAC
1593 error = mac_vnode_check_link(td->td_ucred,
1594 nd.ni_dvp, vp, &nd.ni_cnd);
1595 if (error == 0)
1596 #endif
1597 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1598 VOP_UNLOCK(vp, 0);
1599 vput(nd.ni_dvp);
1600 } else {
1601 vput(nd.ni_dvp);
1602 NDFREE(&nd, NDF_ONLY_PNBUF);
1603 vrele(vp);
1604 vn_finished_write(mp);
1605 goto again;
1606 }
1607 NDFREE(&nd, NDF_ONLY_PNBUF);
1608 }
1609 vrele(vp);
1610 vn_finished_write(mp);
1611 return (error);
1612 }
1613
1614 /*
1615 * Make a symbolic link.
1616 */
1617 #ifndef _SYS_SYSPROTO_H_
1618 struct symlink_args {
1619 char *path;
1620 char *link;
1621 };
1622 #endif
1623 int
1624 sys_symlink(td, uap)
1625 struct thread *td;
1626 register struct symlink_args /* {
1627 char *path;
1628 char *link;
1629 } */ *uap;
1630 {
1631
1632 return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
1633 }
1634
1635 #ifndef _SYS_SYSPROTO_H_
1636 struct symlinkat_args {
1637 char *path;
1638 int fd;
1639 char *path2;
1640 };
1641 #endif
1642 int
1643 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1644 {
1645
1646 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1647 UIO_USERSPACE));
1648 }
1649
1650 int
1651 kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
1652 {
1653
1654 return (kern_symlinkat(td, path, AT_FDCWD, link, segflg));
1655 }
1656
1657 int
1658 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1659 enum uio_seg segflg)
1660 {
1661 struct mount *mp;
1662 struct vattr vattr;
1663 char *syspath;
1664 struct nameidata nd;
1665 int error;
1666 cap_rights_t rights;
1667
1668 if (segflg == UIO_SYSSPACE) {
1669 syspath = path1;
1670 } else {
1671 syspath = uma_zalloc(namei_zone, M_WAITOK);
1672 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1673 goto out;
1674 }
1675 AUDIT_ARG_TEXT(syspath);
1676 restart:
1677 bwillwrite();
1678 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1,
1679 segflg, path2, fd, cap_rights_init(&rights, CAP_SYMLINKAT), td);
1680 if ((error = namei(&nd)) != 0)
1681 goto out;
1682 if (nd.ni_vp) {
1683 NDFREE(&nd, NDF_ONLY_PNBUF);
1684 if (nd.ni_vp == nd.ni_dvp)
1685 vrele(nd.ni_dvp);
1686 else
1687 vput(nd.ni_dvp);
1688 vrele(nd.ni_vp);
1689 error = EEXIST;
1690 goto out;
1691 }
1692 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1693 NDFREE(&nd, NDF_ONLY_PNBUF);
1694 vput(nd.ni_dvp);
1695 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1696 goto out;
1697 goto restart;
1698 }
1699 VATTR_NULL(&vattr);
1700 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1701 #ifdef MAC
1702 vattr.va_type = VLNK;
1703 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1704 &vattr);
1705 if (error != 0)
1706 goto out2;
1707 #endif
1708 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1709 if (error == 0)
1710 vput(nd.ni_vp);
1711 #ifdef MAC
1712 out2:
1713 #endif
1714 NDFREE(&nd, NDF_ONLY_PNBUF);
1715 vput(nd.ni_dvp);
1716 vn_finished_write(mp);
1717 out:
1718 if (segflg != UIO_SYSSPACE)
1719 uma_zfree(namei_zone, syspath);
1720 return (error);
1721 }
1722
1723 /*
1724 * Delete a whiteout from the filesystem.
1725 */
1726 int
1727 sys_undelete(td, uap)
1728 struct thread *td;
1729 register struct undelete_args /* {
1730 char *path;
1731 } */ *uap;
1732 {
1733 struct mount *mp;
1734 struct nameidata nd;
1735 int error;
1736
1737 restart:
1738 bwillwrite();
1739 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1740 UIO_USERSPACE, uap->path, td);
1741 error = namei(&nd);
1742 if (error != 0)
1743 return (error);
1744
1745 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1746 NDFREE(&nd, NDF_ONLY_PNBUF);
1747 if (nd.ni_vp == nd.ni_dvp)
1748 vrele(nd.ni_dvp);
1749 else
1750 vput(nd.ni_dvp);
1751 if (nd.ni_vp)
1752 vrele(nd.ni_vp);
1753 return (EEXIST);
1754 }
1755 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1756 NDFREE(&nd, NDF_ONLY_PNBUF);
1757 vput(nd.ni_dvp);
1758 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1759 return (error);
1760 goto restart;
1761 }
1762 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1763 NDFREE(&nd, NDF_ONLY_PNBUF);
1764 vput(nd.ni_dvp);
1765 vn_finished_write(mp);
1766 return (error);
1767 }
1768
1769 /*
1770 * Delete a name from the filesystem.
1771 */
1772 #ifndef _SYS_SYSPROTO_H_
1773 struct unlink_args {
1774 char *path;
1775 };
1776 #endif
1777 int
1778 sys_unlink(td, uap)
1779 struct thread *td;
1780 struct unlink_args /* {
1781 char *path;
1782 } */ *uap;
1783 {
1784
1785 return (kern_unlink(td, uap->path, UIO_USERSPACE));
1786 }
1787
1788 #ifndef _SYS_SYSPROTO_H_
1789 struct unlinkat_args {
1790 int fd;
1791 char *path;
1792 int flag;
1793 };
1794 #endif
1795 int
1796 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1797 {
1798 int flag = uap->flag;
1799 int fd = uap->fd;
1800 char *path = uap->path;
1801
1802 if (flag & ~AT_REMOVEDIR)
1803 return (EINVAL);
1804
1805 if (flag & AT_REMOVEDIR)
1806 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1807 else
1808 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0));
1809 }
1810
1811 int
1812 kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
1813 {
1814
1815 return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0));
1816 }
1817
1818 int
1819 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1820 ino_t oldinum)
1821 {
1822 struct mount *mp;
1823 struct vnode *vp;
1824 struct nameidata nd;
1825 struct stat sb;
1826 cap_rights_t rights;
1827 int error;
1828
1829 restart:
1830 bwillwrite();
1831 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
1832 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
1833 if ((error = namei(&nd)) != 0)
1834 return (error == EINVAL ? EPERM : error);
1835 vp = nd.ni_vp;
1836 if (vp->v_type == VDIR && oldinum == 0) {
1837 error = EPERM; /* POSIX */
1838 } else if (oldinum != 0 &&
1839 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1840 sb.st_ino != oldinum) {
1841 error = EIDRM; /* Identifier removed */
1842 } else {
1843 /*
1844 * The root of a mounted filesystem cannot be deleted.
1845 *
1846 * XXX: can this only be a VDIR case?
1847 */
1848 if (vp->v_vflag & VV_ROOT)
1849 error = EBUSY;
1850 }
1851 if (error == 0) {
1852 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1853 NDFREE(&nd, NDF_ONLY_PNBUF);
1854 vput(nd.ni_dvp);
1855 if (vp == nd.ni_dvp)
1856 vrele(vp);
1857 else
1858 vput(vp);
1859 if ((error = vn_start_write(NULL, &mp,
1860 V_XSLEEP | PCATCH)) != 0)
1861 return (error);
1862 goto restart;
1863 }
1864 #ifdef MAC
1865 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1866 &nd.ni_cnd);
1867 if (error != 0)
1868 goto out;
1869 #endif
1870 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1871 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1872 #ifdef MAC
1873 out:
1874 #endif
1875 vn_finished_write(mp);
1876 }
1877 NDFREE(&nd, NDF_ONLY_PNBUF);
1878 vput(nd.ni_dvp);
1879 if (vp == nd.ni_dvp)
1880 vrele(vp);
1881 else
1882 vput(vp);
1883 return (error);
1884 }
1885
1886 /*
1887 * Reposition read/write file offset.
1888 */
1889 #ifndef _SYS_SYSPROTO_H_
1890 struct lseek_args {
1891 int fd;
1892 int pad;
1893 off_t offset;
1894 int whence;
1895 };
1896 #endif
1897 int
1898 sys_lseek(td, uap)
1899 struct thread *td;
1900 register struct lseek_args /* {
1901 int fd;
1902 int pad;
1903 off_t offset;
1904 int whence;
1905 } */ *uap;
1906 {
1907 struct file *fp;
1908 cap_rights_t rights;
1909 int error;
1910
1911 AUDIT_ARG_FD(uap->fd);
1912 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_SEEK), &fp);
1913 if (error != 0)
1914 return (error);
1915 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
1916 fo_seek(fp, uap->offset, uap->whence, td) : ESPIPE;
1917 fdrop(fp, td);
1918 return (error);
1919 }
1920
1921 #if defined(COMPAT_43)
1922 /*
1923 * Reposition read/write file offset.
1924 */
1925 #ifndef _SYS_SYSPROTO_H_
1926 struct olseek_args {
1927 int fd;
1928 long offset;
1929 int whence;
1930 };
1931 #endif
1932 int
1933 olseek(td, uap)
1934 struct thread *td;
1935 register struct olseek_args /* {
1936 int fd;
1937 long offset;
1938 int whence;
1939 } */ *uap;
1940 {
1941 struct lseek_args /* {
1942 int fd;
1943 int pad;
1944 off_t offset;
1945 int whence;
1946 } */ nuap;
1947
1948 nuap.fd = uap->fd;
1949 nuap.offset = uap->offset;
1950 nuap.whence = uap->whence;
1951 return (sys_lseek(td, &nuap));
1952 }
1953 #endif /* COMPAT_43 */
1954
1955 /* Version with the 'pad' argument */
1956 int
1957 freebsd6_lseek(td, uap)
1958 struct thread *td;
1959 register struct freebsd6_lseek_args *uap;
1960 {
1961 struct lseek_args ouap;
1962
1963 ouap.fd = uap->fd;
1964 ouap.offset = uap->offset;
1965 ouap.whence = uap->whence;
1966 return (sys_lseek(td, &ouap));
1967 }
1968
1969 /*
1970 * Check access permissions using passed credentials.
1971 */
1972 static int
1973 vn_access(vp, user_flags, cred, td)
1974 struct vnode *vp;
1975 int user_flags;
1976 struct ucred *cred;
1977 struct thread *td;
1978 {
1979 accmode_t accmode;
1980 int error;
1981
1982 /* Flags == 0 means only check for existence. */
1983 error = 0;
1984 if (user_flags) {
1985 accmode = 0;
1986 if (user_flags & R_OK)
1987 accmode |= VREAD;
1988 if (user_flags & W_OK)
1989 accmode |= VWRITE;
1990 if (user_flags & X_OK)
1991 accmode |= VEXEC;
1992 #ifdef MAC
1993 error = mac_vnode_check_access(cred, vp, accmode);
1994 if (error != 0)
1995 return (error);
1996 #endif
1997 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
1998 error = VOP_ACCESS(vp, accmode, cred, td);
1999 }
2000 return (error);
2001 }
2002
2003 /*
2004 * Check access permissions using "real" credentials.
2005 */
2006 #ifndef _SYS_SYSPROTO_H_
2007 struct access_args {
2008 char *path;
2009 int amode;
2010 };
2011 #endif
2012 int
2013 sys_access(td, uap)
2014 struct thread *td;
2015 register struct access_args /* {
2016 char *path;
2017 int amode;
2018 } */ *uap;
2019 {
2020
2021 return (kern_access(td, uap->path, UIO_USERSPACE, uap->amode));
2022 }
2023
2024 #ifndef _SYS_SYSPROTO_H_
2025 struct faccessat_args {
2026 int dirfd;
2027 char *path;
2028 int amode;
2029 int flag;
2030 }
2031 #endif
2032 int
2033 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2034 {
2035
2036 if (uap->flag & ~AT_EACCESS)
2037 return (EINVAL);
2038 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2039 uap->amode));
2040 }
2041
2042 int
2043 kern_access(struct thread *td, char *path, enum uio_seg pathseg, int amode)
2044 {
2045
2046 return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, amode));
2047 }
2048
2049 int
2050 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2051 int flag, int amode)
2052 {
2053 struct ucred *cred, *tmpcred;
2054 struct vnode *vp;
2055 struct nameidata nd;
2056 cap_rights_t rights;
2057 int error;
2058
2059 /*
2060 * Create and modify a temporary credential instead of one that
2061 * is potentially shared.
2062 */
2063 if (!(flag & AT_EACCESS)) {
2064 cred = td->td_ucred;
2065 tmpcred = crdup(cred);
2066 tmpcred->cr_uid = cred->cr_ruid;
2067 tmpcred->cr_groups[0] = cred->cr_rgid;
2068 td->td_ucred = tmpcred;
2069 } else
2070 cred = tmpcred = td->td_ucred;
2071 AUDIT_ARG_VALUE(amode);
2072 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
2073 AUDITVNODE1, pathseg, path, fd, cap_rights_init(&rights, CAP_FSTAT),
2074 td);
2075 if ((error = namei(&nd)) != 0)
2076 goto out1;
2077 vp = nd.ni_vp;
2078
2079 error = vn_access(vp, amode, tmpcred, td);
2080 NDFREE(&nd, NDF_ONLY_PNBUF);
2081 vput(vp);
2082 out1:
2083 if (!(flag & AT_EACCESS)) {
2084 td->td_ucred = cred;
2085 crfree(tmpcred);
2086 }
2087 return (error);
2088 }
2089
2090 /*
2091 * Check access permissions using "effective" credentials.
2092 */
2093 #ifndef _SYS_SYSPROTO_H_
2094 struct eaccess_args {
2095 char *path;
2096 int amode;
2097 };
2098 #endif
2099 int
2100 sys_eaccess(td, uap)
2101 struct thread *td;
2102 register struct eaccess_args /* {
2103 char *path;
2104 int amode;
2105 } */ *uap;
2106 {
2107
2108 return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->amode));
2109 }
2110
2111 int
2112 kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int amode)
2113 {
2114
2115 return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, amode));
2116 }
2117
2118 #if defined(COMPAT_43)
2119 /*
2120 * Get file status; this version follows links.
2121 */
2122 #ifndef _SYS_SYSPROTO_H_
2123 struct ostat_args {
2124 char *path;
2125 struct ostat *ub;
2126 };
2127 #endif
2128 int
2129 ostat(td, uap)
2130 struct thread *td;
2131 register struct ostat_args /* {
2132 char *path;
2133 struct ostat *ub;
2134 } */ *uap;
2135 {
2136 struct stat sb;
2137 struct ostat osb;
2138 int error;
2139
2140 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2141 if (error != 0)
2142 return (error);
2143 cvtstat(&sb, &osb);
2144 return (copyout(&osb, uap->ub, sizeof (osb)));
2145 }
2146
2147 /*
2148 * Get file status; this version does not follow links.
2149 */
2150 #ifndef _SYS_SYSPROTO_H_
2151 struct olstat_args {
2152 char *path;
2153 struct ostat *ub;
2154 };
2155 #endif
2156 int
2157 olstat(td, uap)
2158 struct thread *td;
2159 register struct olstat_args /* {
2160 char *path;
2161 struct ostat *ub;
2162 } */ *uap;
2163 {
2164 struct stat sb;
2165 struct ostat osb;
2166 int error;
2167
2168 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2169 if (error != 0)
2170 return (error);
2171 cvtstat(&sb, &osb);
2172 return (copyout(&osb, uap->ub, sizeof (osb)));
2173 }
2174
2175 /*
2176 * Convert from an old to a new stat structure.
2177 */
2178 void
2179 cvtstat(st, ost)
2180 struct stat *st;
2181 struct ostat *ost;
2182 {
2183
2184 bzero(ost, sizeof(*ost));
2185 ost->st_dev = st->st_dev;
2186 ost->st_ino = st->st_ino;
2187 ost->st_mode = st->st_mode;
2188 ost->st_nlink = st->st_nlink;
2189 ost->st_uid = st->st_uid;
2190 ost->st_gid = st->st_gid;
2191 ost->st_rdev = st->st_rdev;
2192 if (st->st_size < (quad_t)1 << 32)
2193 ost->st_size = st->st_size;
2194 else
2195 ost->st_size = -2;
2196 ost->st_atim = st->st_atim;
2197 ost->st_mtim = st->st_mtim;
2198 ost->st_ctim = st->st_ctim;
2199 ost->st_blksize = st->st_blksize;
2200 ost->st_blocks = st->st_blocks;
2201 ost->st_flags = st->st_flags;
2202 ost->st_gen = st->st_gen;
2203 }
2204 #endif /* COMPAT_43 */
2205
2206 /*
2207 * Get file status; this version follows links.
2208 */
2209 #ifndef _SYS_SYSPROTO_H_
2210 struct stat_args {
2211 char *path;
2212 struct stat *ub;
2213 };
2214 #endif
2215 int
2216 sys_stat(td, uap)
2217 struct thread *td;
2218 register struct stat_args /* {
2219 char *path;
2220 struct stat *ub;
2221 } */ *uap;
2222 {
2223 struct stat sb;
2224 int error;
2225
2226 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2227 if (error == 0)
2228 error = copyout(&sb, uap->ub, sizeof (sb));
2229 return (error);
2230 }
2231
2232 #ifndef _SYS_SYSPROTO_H_
2233 struct fstatat_args {
2234 int fd;
2235 char *path;
2236 struct stat *buf;
2237 int flag;
2238 }
2239 #endif
2240 int
2241 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2242 {
2243 struct stat sb;
2244 int error;
2245
2246 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2247 UIO_USERSPACE, &sb);
2248 if (error == 0)
2249 error = copyout(&sb, uap->buf, sizeof (sb));
2250 return (error);
2251 }
2252
2253 int
2254 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2255 {
2256
2257 return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
2258 }
2259
2260 int
2261 kern_statat(struct thread *td, int flag, int fd, char *path,
2262 enum uio_seg pathseg, struct stat *sbp)
2263 {
2264
2265 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL));
2266 }
2267
2268 int
2269 kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
2270 enum uio_seg pathseg, struct stat *sbp,
2271 void (*hook)(struct vnode *vp, struct stat *sbp))
2272 {
2273 struct nameidata nd;
2274 struct stat sb;
2275 cap_rights_t rights;
2276 int error;
2277
2278 if (flag & ~AT_SYMLINK_NOFOLLOW)
2279 return (EINVAL);
2280
2281 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2282 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd,
2283 cap_rights_init(&rights, CAP_FSTAT), td);
2284
2285 if ((error = namei(&nd)) != 0)
2286 return (error);
2287 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2288 if (error == 0) {
2289 SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0);
2290 if (S_ISREG(sb.st_mode))
2291 SDT_PROBE(vfs, , stat, reg, path, pathseg, 0, 0, 0);
2292 if (__predict_false(hook != NULL))
2293 hook(nd.ni_vp, &sb);
2294 }
2295 NDFREE(&nd, NDF_ONLY_PNBUF);
2296 vput(nd.ni_vp);
2297 if (error != 0)
2298 return (error);
2299 *sbp = sb;
2300 #ifdef KTRACE
2301 if (KTRPOINT(td, KTR_STRUCT))
2302 ktrstat(&sb);
2303 #endif
2304 return (0);
2305 }
2306
2307 /*
2308 * Get file status; this version does not follow links.
2309 */
2310 #ifndef _SYS_SYSPROTO_H_
2311 struct lstat_args {
2312 char *path;
2313 struct stat *ub;
2314 };
2315 #endif
2316 int
2317 sys_lstat(td, uap)
2318 struct thread *td;
2319 register struct lstat_args /* {
2320 char *path;
2321 struct stat *ub;
2322 } */ *uap;
2323 {
2324 struct stat sb;
2325 int error;
2326
2327 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2328 if (error == 0)
2329 error = copyout(&sb, uap->ub, sizeof (sb));
2330 return (error);
2331 }
2332
2333 int
2334 kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
2335 {
2336
2337 return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg,
2338 sbp));
2339 }
2340
2341 /*
2342 * Implementation of the NetBSD [l]stat() functions.
2343 */
2344 void
2345 cvtnstat(sb, nsb)
2346 struct stat *sb;
2347 struct nstat *nsb;
2348 {
2349
2350 bzero(nsb, sizeof *nsb);
2351 nsb->st_dev = sb->st_dev;
2352 nsb->st_ino = sb->st_ino;
2353 nsb->st_mode = sb->st_mode;
2354 nsb->st_nlink = sb->st_nlink;
2355 nsb->st_uid = sb->st_uid;
2356 nsb->st_gid = sb->st_gid;
2357 nsb->st_rdev = sb->st_rdev;
2358 nsb->st_atim = sb->st_atim;
2359 nsb->st_mtim = sb->st_mtim;
2360 nsb->st_ctim = sb->st_ctim;
2361 nsb->st_size = sb->st_size;
2362 nsb->st_blocks = sb->st_blocks;
2363 nsb->st_blksize = sb->st_blksize;
2364 nsb->st_flags = sb->st_flags;
2365 nsb->st_gen = sb->st_gen;
2366 nsb->st_birthtim = sb->st_birthtim;
2367 }
2368
2369 #ifndef _SYS_SYSPROTO_H_
2370 struct nstat_args {
2371 char *path;
2372 struct nstat *ub;
2373 };
2374 #endif
2375 int
2376 sys_nstat(td, uap)
2377 struct thread *td;
2378 register struct nstat_args /* {
2379 char *path;
2380 struct nstat *ub;
2381 } */ *uap;
2382 {
2383 struct stat sb;
2384 struct nstat nsb;
2385 int error;
2386
2387 error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
2388 if (error != 0)
2389 return (error);
2390 cvtnstat(&sb, &nsb);
2391 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2392 }
2393
2394 /*
2395 * NetBSD lstat. Get file status; this version does not follow links.
2396 */
2397 #ifndef _SYS_SYSPROTO_H_
2398 struct lstat_args {
2399 char *path;
2400 struct stat *ub;
2401 };
2402 #endif
2403 int
2404 sys_nlstat(td, uap)
2405 struct thread *td;
2406 register struct nlstat_args /* {
2407 char *path;
2408 struct nstat *ub;
2409 } */ *uap;
2410 {
2411 struct stat sb;
2412 struct nstat nsb;
2413 int error;
2414
2415 error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
2416 if (error != 0)
2417 return (error);
2418 cvtnstat(&sb, &nsb);
2419 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2420 }
2421
2422 /*
2423 * Get configurable pathname variables.
2424 */
2425 #ifndef _SYS_SYSPROTO_H_
2426 struct pathconf_args {
2427 char *path;
2428 int name;
2429 };
2430 #endif
2431 int
2432 sys_pathconf(td, uap)
2433 struct thread *td;
2434 register struct pathconf_args /* {
2435 char *path;
2436 int name;
2437 } */ *uap;
2438 {
2439
2440 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW));
2441 }
2442
2443 #ifndef _SYS_SYSPROTO_H_
2444 struct lpathconf_args {
2445 char *path;
2446 int name;
2447 };
2448 #endif
2449 int
2450 sys_lpathconf(td, uap)
2451 struct thread *td;
2452 register struct lpathconf_args /* {
2453 char *path;
2454 int name;
2455 } */ *uap;
2456 {
2457
2458 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2459 NOFOLLOW));
2460 }
2461
2462 int
2463 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2464 u_long flags)
2465 {
2466 struct nameidata nd;
2467 int error;
2468
2469 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2470 pathseg, path, td);
2471 if ((error = namei(&nd)) != 0)
2472 return (error);
2473 NDFREE(&nd, NDF_ONLY_PNBUF);
2474
2475 /* If asynchronous I/O is available, it works for all files. */
2476 if (name == _PC_ASYNC_IO)
2477 td->td_retval[0] = async_io_version;
2478 else
2479 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
2480 vput(nd.ni_vp);
2481 return (error);
2482 }
2483
2484 /*
2485 * Return target name of a symbolic link.
2486 */
2487 #ifndef _SYS_SYSPROTO_H_
2488 struct readlink_args {
2489 char *path;
2490 char *buf;
2491 size_t count;
2492 };
2493 #endif
2494 int
2495 sys_readlink(td, uap)
2496 struct thread *td;
2497 register struct readlink_args /* {
2498 char *path;
2499 char *buf;
2500 size_t count;
2501 } */ *uap;
2502 {
2503
2504 return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
2505 UIO_USERSPACE, uap->count));
2506 }
2507 #ifndef _SYS_SYSPROTO_H_
2508 struct readlinkat_args {
2509 int fd;
2510 char *path;
2511 char *buf;
2512 size_t bufsize;
2513 };
2514 #endif
2515 int
2516 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2517 {
2518
2519 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2520 uap->buf, UIO_USERSPACE, uap->bufsize));
2521 }
2522
2523 int
2524 kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
2525 enum uio_seg bufseg, size_t count)
2526 {
2527
2528 return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg,
2529 count));
2530 }
2531
2532 int
2533 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2534 char *buf, enum uio_seg bufseg, size_t count)
2535 {
2536 struct vnode *vp;
2537 struct iovec aiov;
2538 struct uio auio;
2539 struct nameidata nd;
2540 int error;
2541
2542 if (count > IOSIZE_MAX)
2543 return (EINVAL);
2544
2545 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
2546 pathseg, path, fd, td);
2547
2548 if ((error = namei(&nd)) != 0)
2549 return (error);
2550 NDFREE(&nd, NDF_ONLY_PNBUF);
2551 vp = nd.ni_vp;
2552 #ifdef MAC
2553 error = mac_vnode_check_readlink(td->td_ucred, vp);
2554 if (error != 0) {
2555 vput(vp);
2556 return (error);
2557 }
2558 #endif
2559 if (vp->v_type != VLNK)
2560 error = EINVAL;
2561 else {
2562 aiov.iov_base = buf;
2563 aiov.iov_len = count;
2564 auio.uio_iov = &aiov;
2565 auio.uio_iovcnt = 1;
2566 auio.uio_offset = 0;
2567 auio.uio_rw = UIO_READ;
2568 auio.uio_segflg = bufseg;
2569 auio.uio_td = td;
2570 auio.uio_resid = count;
2571 error = VOP_READLINK(vp, &auio, td->td_ucred);
2572 td->td_retval[0] = count - auio.uio_resid;
2573 }
2574 vput(vp);
2575 return (error);
2576 }
2577
2578 /*
2579 * Common implementation code for chflags() and fchflags().
2580 */
2581 static int
2582 setfflags(td, vp, flags)
2583 struct thread *td;
2584 struct vnode *vp;
2585 u_long flags;
2586 {
2587 struct mount *mp;
2588 struct vattr vattr;
2589 int error;
2590
2591 /* We can't support the value matching VNOVAL. */
2592 if (flags == VNOVAL)
2593 return (EOPNOTSUPP);
2594
2595 /*
2596 * Prevent non-root users from setting flags on devices. When
2597 * a device is reused, users can retain ownership of the device
2598 * if they are allowed to set flags and programs assume that
2599 * chown can't fail when done as root.
2600 */
2601 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2602 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2603 if (error != 0)
2604 return (error);
2605 }
2606
2607 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2608 return (error);
2609 VATTR_NULL(&vattr);
2610 vattr.va_flags = flags;
2611 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2612 #ifdef MAC
2613 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2614 if (error == 0)
2615 #endif
2616 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2617 VOP_UNLOCK(vp, 0);
2618 vn_finished_write(mp);
2619 return (error);
2620 }
2621
2622 /*
2623 * Change flags of a file given a path name.
2624 */
2625 #ifndef _SYS_SYSPROTO_H_
2626 struct chflags_args {
2627 const char *path;
2628 u_long flags;
2629 };
2630 #endif
2631 int
2632 sys_chflags(td, uap)
2633 struct thread *td;
2634 register struct chflags_args /* {
2635 const char *path;
2636 u_long flags;
2637 } */ *uap;
2638 {
2639
2640 return (kern_chflags(td, uap->path, UIO_USERSPACE, uap->flags));
2641 }
2642
2643 #ifndef _SYS_SYSPROTO_H_
2644 struct chflagsat_args {
2645 int fd;
2646 const char *path;
2647 u_long flags;
2648 int atflag;
2649 }
2650 #endif
2651 int
2652 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2653 {
2654 int fd = uap->fd;
2655 const char *path = uap->path;
2656 u_long flags = uap->flags;
2657 int atflag = uap->atflag;
2658
2659 if (atflag & ~AT_SYMLINK_NOFOLLOW)
2660 return (EINVAL);
2661
2662 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag));
2663 }
2664
2665 static int
2666 kern_chflags(struct thread *td, const char *path, enum uio_seg pathseg,
2667 u_long flags)
2668 {
2669
2670 return (kern_chflagsat(td, AT_FDCWD, path, pathseg, flags, 0));
2671 }
2672
2673 /*
2674 * Same as chflags() but doesn't follow symlinks.
2675 */
2676 int
2677 sys_lchflags(td, uap)
2678 struct thread *td;
2679 register struct lchflags_args /* {
2680 const char *path;
2681 u_long flags;
2682 } */ *uap;
2683 {
2684
2685 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2686 uap->flags, AT_SYMLINK_NOFOLLOW));
2687 }
2688
2689 static int
2690 kern_chflagsat(struct thread *td, int fd, const char *path,
2691 enum uio_seg pathseg, u_long flags, int atflag)
2692 {
2693 struct nameidata nd;
2694 cap_rights_t rights;
2695 int error, follow;
2696
2697 AUDIT_ARG_FFLAGS(flags);
2698 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2699 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2700 cap_rights_init(&rights, CAP_FCHFLAGS), td);
2701 if ((error = namei(&nd)) != 0)
2702 return (error);
2703 NDFREE(&nd, NDF_ONLY_PNBUF);
2704 error = setfflags(td, nd.ni_vp, flags);
2705 vrele(nd.ni_vp);
2706 return (error);
2707 }
2708
2709 /*
2710 * Change flags of a file given a file descriptor.
2711 */
2712 #ifndef _SYS_SYSPROTO_H_
2713 struct fchflags_args {
2714 int fd;
2715 u_long flags;
2716 };
2717 #endif
2718 int
2719 sys_fchflags(td, uap)
2720 struct thread *td;
2721 register struct fchflags_args /* {
2722 int fd;
2723 u_long flags;
2724 } */ *uap;
2725 {
2726 struct file *fp;
2727 cap_rights_t rights;
2728 int error;
2729
2730 AUDIT_ARG_FD(uap->fd);
2731 AUDIT_ARG_FFLAGS(uap->flags);
2732 error = getvnode(td->td_proc->p_fd, uap->fd,
2733 cap_rights_init(&rights, CAP_FCHFLAGS), &fp);
2734 if (error != 0)
2735 return (error);
2736 #ifdef AUDIT
2737 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2738 AUDIT_ARG_VNODE1(fp->f_vnode);
2739 VOP_UNLOCK(fp->f_vnode, 0);
2740 #endif
2741 error = setfflags(td, fp->f_vnode, uap->flags);
2742 fdrop(fp, td);
2743 return (error);
2744 }
2745
2746 /*
2747 * Common implementation code for chmod(), lchmod() and fchmod().
2748 */
2749 int
2750 setfmode(td, cred, vp, mode)
2751 struct thread *td;
2752 struct ucred *cred;
2753 struct vnode *vp;
2754 int mode;
2755 {
2756 struct mount *mp;
2757 struct vattr vattr;
2758 int error;
2759
2760 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2761 return (error);
2762 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2763 VATTR_NULL(&vattr);
2764 vattr.va_mode = mode & ALLPERMS;
2765 #ifdef MAC
2766 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2767 if (error == 0)
2768 #endif
2769 error = VOP_SETATTR(vp, &vattr, cred);
2770 VOP_UNLOCK(vp, 0);
2771 vn_finished_write(mp);
2772 return (error);
2773 }
2774
2775 /*
2776 * Change mode of a file given path name.
2777 */
2778 #ifndef _SYS_SYSPROTO_H_
2779 struct chmod_args {
2780 char *path;
2781 int mode;
2782 };
2783 #endif
2784 int
2785 sys_chmod(td, uap)
2786 struct thread *td;
2787 register struct chmod_args /* {
2788 char *path;
2789 int mode;
2790 } */ *uap;
2791 {
2792
2793 return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
2794 }
2795
2796 #ifndef _SYS_SYSPROTO_H_
2797 struct fchmodat_args {
2798 int dirfd;
2799 char *path;
2800 mode_t mode;
2801 int flag;
2802 }
2803 #endif
2804 int
2805 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2806 {
2807 int flag = uap->flag;
2808 int fd = uap->fd;
2809 char *path = uap->path;
2810 mode_t mode = uap->mode;
2811
2812 if (flag & ~AT_SYMLINK_NOFOLLOW)
2813 return (EINVAL);
2814
2815 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2816 }
2817
2818 int
2819 kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
2820 {
2821
2822 return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0));
2823 }
2824
2825 /*
2826 * Change mode of a file given path name (don't follow links.)
2827 */
2828 #ifndef _SYS_SYSPROTO_H_
2829 struct lchmod_args {
2830 char *path;
2831 int mode;
2832 };
2833 #endif
2834 int
2835 sys_lchmod(td, uap)
2836 struct thread *td;
2837 register struct lchmod_args /* {
2838 char *path;
2839 int mode;
2840 } */ *uap;
2841 {
2842
2843 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2844 uap->mode, AT_SYMLINK_NOFOLLOW));
2845 }
2846
2847 int
2848 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2849 mode_t mode, int flag)
2850 {
2851 struct nameidata nd;
2852 cap_rights_t rights;
2853 int error, follow;
2854
2855 AUDIT_ARG_MODE(mode);
2856 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2857 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2858 cap_rights_init(&rights, CAP_FCHMOD), td);
2859 if ((error = namei(&nd)) != 0)
2860 return (error);
2861 NDFREE(&nd, NDF_ONLY_PNBUF);
2862 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2863 vrele(nd.ni_vp);
2864 return (error);
2865 }
2866
2867 /*
2868 * Change mode of a file given a file descriptor.
2869 */
2870 #ifndef _SYS_SYSPROTO_H_
2871 struct fchmod_args {
2872 int fd;
2873 int mode;
2874 };
2875 #endif
2876 int
2877 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2878 {
2879 struct file *fp;
2880 cap_rights_t rights;
2881 int error;
2882
2883 AUDIT_ARG_FD(uap->fd);
2884 AUDIT_ARG_MODE(uap->mode);
2885
2886 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHMOD), &fp);
2887 if (error != 0)
2888 return (error);
2889 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2890 fdrop(fp, td);
2891 return (error);
2892 }
2893
2894 /*
2895 * Common implementation for chown(), lchown(), and fchown()
2896 */
2897 int
2898 setfown(td, cred, vp, uid, gid)
2899 struct thread *td;
2900 struct ucred *cred;
2901 struct vnode *vp;
2902 uid_t uid;
2903 gid_t gid;
2904 {
2905 struct mount *mp;
2906 struct vattr vattr;
2907 int error;
2908
2909 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2910 return (error);
2911 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2912 VATTR_NULL(&vattr);
2913 vattr.va_uid = uid;
2914 vattr.va_gid = gid;
2915 #ifdef MAC
2916 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
2917 vattr.va_gid);
2918 if (error == 0)
2919 #endif
2920 error = VOP_SETATTR(vp, &vattr, cred);
2921 VOP_UNLOCK(vp, 0);
2922 vn_finished_write(mp);
2923 return (error);
2924 }
2925
2926 /*
2927 * Set ownership given a path name.
2928 */
2929 #ifndef _SYS_SYSPROTO_H_
2930 struct chown_args {
2931 char *path;
2932 int uid;
2933 int gid;
2934 };
2935 #endif
2936 int
2937 sys_chown(td, uap)
2938 struct thread *td;
2939 register struct chown_args /* {
2940 char *path;
2941 int uid;
2942 int gid;
2943 } */ *uap;
2944 {
2945
2946 return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
2947 }
2948
2949 #ifndef _SYS_SYSPROTO_H_
2950 struct fchownat_args {
2951 int fd;
2952 const char * path;
2953 uid_t uid;
2954 gid_t gid;
2955 int flag;
2956 };
2957 #endif
2958 int
2959 sys_fchownat(struct thread *td, struct fchownat_args *uap)
2960 {
2961 int flag;
2962
2963 flag = uap->flag;
2964 if (flag & ~AT_SYMLINK_NOFOLLOW)
2965 return (EINVAL);
2966
2967 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
2968 uap->gid, uap->flag));
2969 }
2970
2971 int
2972 kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
2973 int gid)
2974 {
2975
2976 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0));
2977 }
2978
2979 int
2980 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2981 int uid, int gid, int flag)
2982 {
2983 struct nameidata nd;
2984 cap_rights_t rights;
2985 int error, follow;
2986
2987 AUDIT_ARG_OWNER(uid, gid);
2988 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2989 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2990 cap_rights_init(&rights, CAP_FCHOWN), td);
2991
2992 if ((error = namei(&nd)) != 0)
2993 return (error);
2994 NDFREE(&nd, NDF_ONLY_PNBUF);
2995 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
2996 vrele(nd.ni_vp);
2997 return (error);
2998 }
2999
3000 /*
3001 * Set ownership given a path name, do not cross symlinks.
3002 */
3003 #ifndef _SYS_SYSPROTO_H_
3004 struct lchown_args {
3005 char *path;
3006 int uid;
3007 int gid;
3008 };
3009 #endif
3010 int
3011 sys_lchown(td, uap)
3012 struct thread *td;
3013 register struct lchown_args /* {
3014 char *path;
3015 int uid;
3016 int gid;
3017 } */ *uap;
3018 {
3019
3020 return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
3021 }
3022
3023 int
3024 kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
3025 int gid)
3026 {
3027
3028 return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid,
3029 AT_SYMLINK_NOFOLLOW));
3030 }
3031
3032 /*
3033 * Set ownership given a file descriptor.
3034 */
3035 #ifndef _SYS_SYSPROTO_H_
3036 struct fchown_args {
3037 int fd;
3038 int uid;
3039 int gid;
3040 };
3041 #endif
3042 int
3043 sys_fchown(td, uap)
3044 struct thread *td;
3045 register struct fchown_args /* {
3046 int fd;
3047 int uid;
3048 int gid;
3049 } */ *uap;
3050 {
3051 struct file *fp;
3052 cap_rights_t rights;
3053 int error;
3054
3055 AUDIT_ARG_FD(uap->fd);
3056 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3057 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHOWN), &fp);
3058 if (error != 0)
3059 return (error);
3060 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3061 fdrop(fp, td);
3062 return (error);
3063 }
3064
3065 /*
3066 * Common implementation code for utimes(), lutimes(), and futimes().
3067 */
3068 static int
3069 getutimes(usrtvp, tvpseg, tsp)
3070 const struct timeval *usrtvp;
3071 enum uio_seg tvpseg;
3072 struct timespec *tsp;
3073 {
3074 struct timeval tv[2];
3075 const struct timeval *tvp;
3076 int error;
3077
3078 if (usrtvp == NULL) {
3079 vfs_timestamp(&tsp[0]);
3080 tsp[1] = tsp[0];
3081 } else {
3082 if (tvpseg == UIO_SYSSPACE) {
3083 tvp = usrtvp;
3084 } else {
3085 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3086 return (error);
3087 tvp = tv;
3088 }
3089
3090 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3091 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3092 return (EINVAL);
3093 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3094 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3095 }
3096 return (0);
3097 }
3098
3099 /*
3100 * Common implementation code for utimes(), lutimes(), and futimes().
3101 */
3102 static int
3103 setutimes(td, vp, ts, numtimes, nullflag)
3104 struct thread *td;
3105 struct vnode *vp;
3106 const struct timespec *ts;
3107 int numtimes;
3108 int nullflag;
3109 {
3110 struct mount *mp;
3111 struct vattr vattr;
3112 int error, setbirthtime;
3113
3114 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3115 return (error);
3116 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3117 setbirthtime = 0;
3118 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3119 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3120 setbirthtime = 1;
3121 VATTR_NULL(&vattr);
3122 vattr.va_atime = ts[0];
3123 vattr.va_mtime = ts[1];
3124 if (setbirthtime)
3125 vattr.va_birthtime = ts[1];
3126 if (numtimes > 2)
3127 vattr.va_birthtime = ts[2];
3128 if (nullflag)
3129 vattr.va_vaflags |= VA_UTIMES_NULL;
3130 #ifdef MAC
3131 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3132 vattr.va_mtime);
3133 #endif
3134 if (error == 0)
3135 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3136 VOP_UNLOCK(vp, 0);
3137 vn_finished_write(mp);
3138 return (error);
3139 }
3140
3141 /*
3142 * Set the access and modification times of a file.
3143 */
3144 #ifndef _SYS_SYSPROTO_H_
3145 struct utimes_args {
3146 char *path;
3147 struct timeval *tptr;
3148 };
3149 #endif
3150 int
3151 sys_utimes(td, uap)
3152 struct thread *td;
3153 register struct utimes_args /* {
3154 char *path;
3155 struct timeval *tptr;
3156 } */ *uap;
3157 {
3158
3159 return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3160 UIO_USERSPACE));
3161 }
3162
3163 #ifndef _SYS_SYSPROTO_H_
3164 struct futimesat_args {
3165 int fd;
3166 const char * path;
3167 const struct timeval * times;
3168 };
3169 #endif
3170 int
3171 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3172 {
3173
3174 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3175 uap->times, UIO_USERSPACE));
3176 }
3177
3178 int
3179 kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
3180 struct timeval *tptr, enum uio_seg tptrseg)
3181 {
3182
3183 return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg));
3184 }
3185
3186 int
3187 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3188 struct timeval *tptr, enum uio_seg tptrseg)
3189 {
3190 struct nameidata nd;
3191 struct timespec ts[2];
3192 cap_rights_t rights;
3193 int error;
3194
3195 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3196 return (error);
3197 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3198 cap_rights_init(&rights, CAP_FUTIMES), td);
3199
3200 if ((error = namei(&nd)) != 0)
3201 return (error);
3202 NDFREE(&nd, NDF_ONLY_PNBUF);
3203 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3204 vrele(nd.ni_vp);
3205 return (error);
3206 }
3207
3208 /*
3209 * Set the access and modification times of a file.
3210 */
3211 #ifndef _SYS_SYSPROTO_H_
3212 struct lutimes_args {
3213 char *path;
3214 struct timeval *tptr;
3215 };
3216 #endif
3217 int
3218 sys_lutimes(td, uap)
3219 struct thread *td;
3220 register struct lutimes_args /* {
3221 char *path;
3222 struct timeval *tptr;
3223 } */ *uap;
3224 {
3225
3226 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3227 UIO_USERSPACE));
3228 }
3229
3230 int
3231 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
3232 struct timeval *tptr, enum uio_seg tptrseg)
3233 {
3234 struct timespec ts[2];
3235 struct nameidata nd;
3236 int error;
3237
3238 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3239 return (error);
3240 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
3241 if ((error = namei(&nd)) != 0)
3242 return (error);
3243 NDFREE(&nd, NDF_ONLY_PNBUF);
3244 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3245 vrele(nd.ni_vp);
3246 return (error);
3247 }
3248
3249 /*
3250 * Set the access and modification times of a file.
3251 */
3252 #ifndef _SYS_SYSPROTO_H_
3253 struct futimes_args {
3254 int fd;
3255 struct timeval *tptr;
3256 };
3257 #endif
3258 int
3259 sys_futimes(td, uap)
3260 struct thread *td;
3261 register struct futimes_args /* {
3262 int fd;
3263 struct timeval *tptr;
3264 } */ *uap;
3265 {
3266
3267 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3268 }
3269
3270 int
3271 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3272 enum uio_seg tptrseg)
3273 {
3274 struct timespec ts[2];
3275 struct file *fp;
3276 cap_rights_t rights;
3277 int error;
3278
3279 AUDIT_ARG_FD(fd);
3280 error = getutimes(tptr, tptrseg, ts);
3281 if (error != 0)
3282 return (error);
3283 error = getvnode(td->td_proc->p_fd, fd,
3284 cap_rights_init(&rights, CAP_FUTIMES), &fp);
3285 if (error != 0)
3286 return (error);
3287 #ifdef AUDIT
3288 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3289 AUDIT_ARG_VNODE1(fp->f_vnode);
3290 VOP_UNLOCK(fp->f_vnode, 0);
3291 #endif
3292 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3293 fdrop(fp, td);
3294 return (error);
3295 }
3296
3297 /*
3298 * Truncate a file given its path name.
3299 */
3300 #ifndef _SYS_SYSPROTO_H_
3301 struct truncate_args {
3302 char *path;
3303 int pad;
3304 off_t length;
3305 };
3306 #endif
3307 int
3308 sys_truncate(td, uap)
3309 struct thread *td;
3310 register struct truncate_args /* {
3311 char *path;
3312 int pad;
3313 off_t length;
3314 } */ *uap;
3315 {
3316
3317 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3318 }
3319
3320 int
3321 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3322 {
3323 struct mount *mp;
3324 struct vnode *vp;
3325 void *rl_cookie;
3326 struct vattr vattr;
3327 struct nameidata nd;
3328 int error;
3329
3330 if (length < 0)
3331 return(EINVAL);
3332 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
3333 if ((error = namei(&nd)) != 0)
3334 return (error);
3335 vp = nd.ni_vp;
3336 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3337 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3338 vn_rangelock_unlock(vp, rl_cookie);
3339 vrele(vp);
3340 return (error);
3341 }
3342 NDFREE(&nd, NDF_ONLY_PNBUF);
3343 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3344 if (vp->v_type == VDIR)
3345 error = EISDIR;
3346 #ifdef MAC
3347 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3348 }
3349 #endif
3350 else if ((error = vn_writechk(vp)) == 0 &&
3351 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3352 VATTR_NULL(&vattr);
3353 vattr.va_size = length;
3354 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3355 }
3356 VOP_UNLOCK(vp, 0);
3357 vn_finished_write(mp);
3358 vn_rangelock_unlock(vp, rl_cookie);
3359 vrele(vp);
3360 return (error);
3361 }
3362
3363 #if defined(COMPAT_43)
3364 /*
3365 * Truncate a file given its path name.
3366 */
3367 #ifndef _SYS_SYSPROTO_H_
3368 struct otruncate_args {
3369 char *path;
3370 long length;
3371 };
3372 #endif
3373 int
3374 otruncate(td, uap)
3375 struct thread *td;
3376 register struct otruncate_args /* {
3377 char *path;
3378 long length;
3379 } */ *uap;
3380 {
3381 struct truncate_args /* {
3382 char *path;
3383 int pad;
3384 off_t length;
3385 } */ nuap;
3386
3387 nuap.path = uap->path;
3388 nuap.length = uap->length;
3389 return (sys_truncate(td, &nuap));
3390 }
3391 #endif /* COMPAT_43 */
3392
3393 /* Versions with the pad argument */
3394 int
3395 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3396 {
3397 struct truncate_args ouap;
3398
3399 ouap.path = uap->path;
3400 ouap.length = uap->length;
3401 return (sys_truncate(td, &ouap));
3402 }
3403
3404 int
3405 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3406 {
3407 struct ftruncate_args ouap;
3408
3409 ouap.fd = uap->fd;
3410 ouap.length = uap->length;
3411 return (sys_ftruncate(td, &ouap));
3412 }
3413
3414 /*
3415 * Sync an open file.
3416 */
3417 #ifndef _SYS_SYSPROTO_H_
3418 struct fsync_args {
3419 int fd;
3420 };
3421 #endif
3422 int
3423 sys_fsync(td, uap)
3424 struct thread *td;
3425 struct fsync_args /* {
3426 int fd;
3427 } */ *uap;
3428 {
3429 struct vnode *vp;
3430 struct mount *mp;
3431 struct file *fp;
3432 cap_rights_t rights;
3433 int error, lock_flags;
3434
3435 AUDIT_ARG_FD(uap->fd);
3436 error = getvnode(td->td_proc->p_fd, uap->fd,
3437 cap_rights_init(&rights, CAP_FSYNC), &fp);
3438 if (error != 0)
3439 return (error);
3440 vp = fp->f_vnode;
3441 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3442 if (error != 0)
3443 goto drop;
3444 if (MNT_SHARED_WRITES(mp) ||
3445 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3446 lock_flags = LK_SHARED;
3447 } else {
3448 lock_flags = LK_EXCLUSIVE;
3449 }
3450 vn_lock(vp, lock_flags | LK_RETRY);
3451 AUDIT_ARG_VNODE1(vp);
3452 if (vp->v_object != NULL) {
3453 VM_OBJECT_WLOCK(vp->v_object);
3454 vm_object_page_clean(vp->v_object, 0, 0, 0);
3455 VM_OBJECT_WUNLOCK(vp->v_object);
3456 }
3457 error = VOP_FSYNC(vp, MNT_WAIT, td);
3458
3459 VOP_UNLOCK(vp, 0);
3460 vn_finished_write(mp);
3461 drop:
3462 fdrop(fp, td);
3463 return (error);
3464 }
3465
3466 /*
3467 * Rename files. Source and destination must either both be directories, or
3468 * both not be directories. If target is a directory, it must be empty.
3469 */
3470 #ifndef _SYS_SYSPROTO_H_
3471 struct rename_args {
3472 char *from;
3473 char *to;
3474 };
3475 #endif
3476 int
3477 sys_rename(td, uap)
3478 struct thread *td;
3479 register struct rename_args /* {
3480 char *from;
3481 char *to;
3482 } */ *uap;
3483 {
3484
3485 return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
3486 }
3487
3488 #ifndef _SYS_SYSPROTO_H_
3489 struct renameat_args {
3490 int oldfd;
3491 char *old;
3492 int newfd;
3493 char *new;
3494 };
3495 #endif
3496 int
3497 sys_renameat(struct thread *td, struct renameat_args *uap)
3498 {
3499
3500 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3501 UIO_USERSPACE));
3502 }
3503
3504 int
3505 kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
3506 {
3507
3508 return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg));
3509 }
3510
3511 int
3512 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3513 enum uio_seg pathseg)
3514 {
3515 struct mount *mp = NULL;
3516 struct vnode *tvp, *fvp, *tdvp;
3517 struct nameidata fromnd, tond;
3518 cap_rights_t rights;
3519 int error;
3520
3521 bwillwrite();
3522 #ifdef MAC
3523 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3524 AUDITVNODE1, pathseg, old, oldfd,
3525 cap_rights_init(&rights, CAP_RENAMEAT), td);
3526 #else
3527 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
3528 pathseg, old, oldfd, cap_rights_init(&rights, CAP_RENAMEAT), td);
3529 #endif
3530
3531 if ((error = namei(&fromnd)) != 0)
3532 return (error);
3533 #ifdef MAC
3534 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3535 fromnd.ni_vp, &fromnd.ni_cnd);
3536 VOP_UNLOCK(fromnd.ni_dvp, 0);
3537 if (fromnd.ni_dvp != fromnd.ni_vp)
3538 VOP_UNLOCK(fromnd.ni_vp, 0);
3539 #endif
3540 fvp = fromnd.ni_vp;
3541 if (error == 0)
3542 error = vn_start_write(fvp, &mp, V_WAIT | PCATCH);
3543 if (error != 0) {
3544 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3545 vrele(fromnd.ni_dvp);
3546 vrele(fvp);
3547 goto out1;
3548 }
3549 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
3550 SAVESTART | AUDITVNODE2, pathseg, new, newfd,
3551 cap_rights_init(&rights, CAP_LINKAT), td);
3552 if (fromnd.ni_vp->v_type == VDIR)
3553 tond.ni_cnd.cn_flags |= WILLBEDIR;
3554 if ((error = namei(&tond)) != 0) {
3555 /* Translate error code for rename("dir1", "dir2/."). */
3556 if (error == EISDIR && fvp->v_type == VDIR)
3557 error = EINVAL;
3558 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3559 vrele(fromnd.ni_dvp);
3560 vrele(fvp);
3561 vn_finished_write(mp);
3562 goto out1;
3563 }
3564 tdvp = tond.ni_dvp;
3565 tvp = tond.ni_vp;
3566 if (tvp != NULL) {
3567 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3568 error = ENOTDIR;
3569 goto out;
3570 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3571 error = EISDIR;
3572 goto out;
3573 }
3574 #ifdef CAPABILITIES
3575 if (newfd != AT_FDCWD) {
3576 /*
3577 * If the target already exists we require CAP_UNLINKAT
3578 * from 'newfd'.
3579 */
3580 error = cap_check(&tond.ni_filecaps.fc_rights,
3581 cap_rights_init(&rights, CAP_UNLINKAT));
3582 if (error != 0)
3583 goto out;
3584 }
3585 #endif
3586 }
3587 if (fvp == tdvp) {
3588 error = EINVAL;
3589 goto out;
3590 }
3591 /*
3592 * If the source is the same as the destination (that is, if they
3593 * are links to the same vnode), then there is nothing to do.
3594 */
3595 if (fvp == tvp)
3596 error = -1;
3597 #ifdef MAC
3598 else
3599 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3600 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3601 #endif
3602 out:
3603 if (error == 0) {
3604 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3605 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3606 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3607 NDFREE(&tond, NDF_ONLY_PNBUF);
3608 } else {
3609 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3610 NDFREE(&tond, NDF_ONLY_PNBUF);
3611 if (tvp != NULL)
3612 vput(tvp);
3613 if (tdvp == tvp)
3614 vrele(tdvp);
3615 else
3616 vput(tdvp);
3617 vrele(fromnd.ni_dvp);
3618 vrele(fvp);
3619 }
3620 vrele(tond.ni_startdir);
3621 vn_finished_write(mp);
3622 out1:
3623 if (fromnd.ni_startdir)
3624 vrele(fromnd.ni_startdir);
3625 if (error == -1)
3626 return (0);
3627 return (error);
3628 }
3629
3630 /*
3631 * Make a directory file.
3632 */
3633 #ifndef _SYS_SYSPROTO_H_
3634 struct mkdir_args {
3635 char *path;
3636 int mode;
3637 };
3638 #endif
3639 int
3640 sys_mkdir(td, uap)
3641 struct thread *td;
3642 register struct mkdir_args /* {
3643 char *path;
3644 int mode;
3645 } */ *uap;
3646 {
3647
3648 return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
3649 }
3650
3651 #ifndef _SYS_SYSPROTO_H_
3652 struct mkdirat_args {
3653 int fd;
3654 char *path;
3655 mode_t mode;
3656 };
3657 #endif
3658 int
3659 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3660 {
3661
3662 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3663 }
3664
3665 int
3666 kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
3667 {
3668
3669 return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode));
3670 }
3671
3672 int
3673 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3674 int mode)
3675 {
3676 struct mount *mp;
3677 struct vnode *vp;
3678 struct vattr vattr;
3679 struct nameidata nd;
3680 cap_rights_t rights;
3681 int error;
3682
3683 AUDIT_ARG_MODE(mode);
3684 restart:
3685 bwillwrite();
3686 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1,
3687 segflg, path, fd, cap_rights_init(&rights, CAP_MKDIRAT), td);
3688 nd.ni_cnd.cn_flags |= WILLBEDIR;
3689 if ((error = namei(&nd)) != 0)
3690 return (error);
3691 vp = nd.ni_vp;
3692 if (vp != NULL) {
3693 NDFREE(&nd, NDF_ONLY_PNBUF);
3694 /*
3695 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3696 * the strange behaviour of leaving the vnode unlocked
3697 * if the target is the same vnode as the parent.
3698 */
3699 if (vp == nd.ni_dvp)
3700 vrele(nd.ni_dvp);
3701 else
3702 vput(nd.ni_dvp);
3703 vrele(vp);
3704 return (EEXIST);
3705 }
3706 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3707 NDFREE(&nd, NDF_ONLY_PNBUF);
3708 vput(nd.ni_dvp);
3709 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3710 return (error);
3711 goto restart;
3712 }
3713 VATTR_NULL(&vattr);
3714 vattr.va_type = VDIR;
3715 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3716 #ifdef MAC
3717 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3718 &vattr);
3719 if (error != 0)
3720 goto out;
3721 #endif
3722 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3723 #ifdef MAC
3724 out:
3725 #endif
3726 NDFREE(&nd, NDF_ONLY_PNBUF);
3727 vput(nd.ni_dvp);
3728 if (error == 0)
3729 vput(nd.ni_vp);
3730 vn_finished_write(mp);
3731 return (error);
3732 }
3733
3734 /*
3735 * Remove a directory file.
3736 */
3737 #ifndef _SYS_SYSPROTO_H_
3738 struct rmdir_args {
3739 char *path;
3740 };
3741 #endif
3742 int
3743 sys_rmdir(td, uap)
3744 struct thread *td;
3745 struct rmdir_args /* {
3746 char *path;
3747 } */ *uap;
3748 {
3749
3750 return (kern_rmdir(td, uap->path, UIO_USERSPACE));
3751 }
3752
3753 int
3754 kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
3755 {
3756
3757 return (kern_rmdirat(td, AT_FDCWD, path, pathseg));
3758 }
3759
3760 int
3761 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3762 {
3763 struct mount *mp;
3764 struct vnode *vp;
3765 struct nameidata nd;
3766 cap_rights_t rights;
3767 int error;
3768
3769 restart:
3770 bwillwrite();
3771 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3772 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td);
3773 if ((error = namei(&nd)) != 0)
3774 return (error);
3775 vp = nd.ni_vp;
3776 if (vp->v_type != VDIR) {
3777 error = ENOTDIR;
3778 goto out;
3779 }
3780 /*
3781 * No rmdir "." please.
3782 */
3783 if (nd.ni_dvp == vp) {
3784 error = EINVAL;
3785 goto out;
3786 }
3787 /*
3788 * The root of a mounted filesystem cannot be deleted.
3789 */
3790 if (vp->v_vflag & VV_ROOT) {
3791 error = EBUSY;
3792 goto out;
3793 }
3794 #ifdef MAC
3795 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3796 &nd.ni_cnd);
3797 if (error != 0)
3798 goto out;
3799 #endif
3800 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3801 NDFREE(&nd, NDF_ONLY_PNBUF);
3802 vput(vp);
3803 if (nd.ni_dvp == vp)
3804 vrele(nd.ni_dvp);
3805 else
3806 vput(nd.ni_dvp);
3807 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3808 return (error);
3809 goto restart;
3810 }
3811 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3812 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3813 vn_finished_write(mp);
3814 out:
3815 NDFREE(&nd, NDF_ONLY_PNBUF);
3816 vput(vp);
3817 if (nd.ni_dvp == vp)
3818 vrele(nd.ni_dvp);
3819 else
3820 vput(nd.ni_dvp);
3821 return (error);
3822 }
3823
3824 #ifdef COMPAT_43
3825 /*
3826 * Read a block of directory entries in a filesystem independent format.
3827 */
3828 #ifndef _SYS_SYSPROTO_H_
3829 struct ogetdirentries_args {
3830 int fd;
3831 char *buf;
3832 u_int count;
3833 long *basep;
3834 };
3835 #endif
3836 int
3837 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
3838 {
3839 long loff;
3840 int error;
3841
3842 error = kern_ogetdirentries(td, uap, &loff);
3843 if (error == 0)
3844 error = copyout(&loff, uap->basep, sizeof(long));
3845 return (error);
3846 }
3847
3848 int
3849 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
3850 long *ploff)
3851 {
3852 struct vnode *vp;
3853 struct file *fp;
3854 struct uio auio, kuio;
3855 struct iovec aiov, kiov;
3856 struct dirent *dp, *edp;
3857 cap_rights_t rights;
3858 caddr_t dirbuf;
3859 int error, eofflag, readcnt;
3860 long loff;
3861 off_t foffset;
3862
3863 /* XXX arbitrary sanity limit on `count'. */
3864 if (uap->count > 64 * 1024)
3865 return (EINVAL);
3866 error = getvnode(td->td_proc->p_fd, uap->fd,
3867 cap_rights_init(&rights, CAP_READ), &fp);
3868 if (error != 0)
3869 return (error);
3870 if ((fp->f_flag & FREAD) == 0) {
3871 fdrop(fp, td);
3872 return (EBADF);
3873 }
3874 vp = fp->f_vnode;
3875 foffset = foffset_lock(fp, 0);
3876 unionread:
3877 if (vp->v_type != VDIR) {
3878 foffset_unlock(fp, foffset, 0);
3879 fdrop(fp, td);
3880 return (EINVAL);
3881 }
3882 aiov.iov_base = uap->buf;
3883 aiov.iov_len = uap->count;
3884 auio.uio_iov = &aiov;
3885 auio.uio_iovcnt = 1;
3886 auio.uio_rw = UIO_READ;
3887 auio.uio_segflg = UIO_USERSPACE;
3888 auio.uio_td = td;
3889 auio.uio_resid = uap->count;
3890 vn_lock(vp, LK_SHARED | LK_RETRY);
3891 loff = auio.uio_offset = foffset;
3892 #ifdef MAC
3893 error = mac_vnode_check_readdir(td->td_ucred, vp);
3894 if (error != 0) {
3895 VOP_UNLOCK(vp, 0);
3896 foffset_unlock(fp, foffset, FOF_NOUPDATE);
3897 fdrop(fp, td);
3898 return (error);
3899 }
3900 #endif
3901 # if (BYTE_ORDER != LITTLE_ENDIAN)
3902 if (vp->v_mount->mnt_maxsymlinklen <= 0) {
3903 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
3904 NULL, NULL);
3905 foffset = auio.uio_offset;
3906 } else
3907 # endif
3908 {
3909 kuio = auio;
3910 kuio.uio_iov = &kiov;
3911 kuio.uio_segflg = UIO_SYSSPACE;
3912 kiov.iov_len = uap->count;
3913 dirbuf = malloc(uap->count, M_TEMP, M_WAITOK);
3914 kiov.iov_base = dirbuf;
3915 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
3916 NULL, NULL);
3917 foffset = kuio.uio_offset;
3918 if (error == 0) {
3919 readcnt = uap->count - kuio.uio_resid;
3920 edp = (struct dirent *)&dirbuf[readcnt];
3921 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
3922 # if (BYTE_ORDER == LITTLE_ENDIAN)
3923 /*
3924 * The expected low byte of
3925 * dp->d_namlen is our dp->d_type.
3926 * The high MBZ byte of dp->d_namlen
3927 * is our dp->d_namlen.
3928 */
3929 dp->d_type = dp->d_namlen;
3930 dp->d_namlen = 0;
3931 # else
3932 /*
3933 * The dp->d_type is the high byte
3934 * of the expected dp->d_namlen,
3935 * so must be zero'ed.
3936 */
3937 dp->d_type = 0;
3938 # endif
3939 if (dp->d_reclen > 0) {
3940 dp = (struct dirent *)
3941 ((char *)dp + dp->d_reclen);
3942 } else {
3943 error = EIO;
3944 break;
3945 }
3946 }
3947 if (dp >= edp)
3948 error = uiomove(dirbuf, readcnt, &auio);
3949 }
3950 free(dirbuf, M_TEMP);
3951 }
3952 if (error != 0) {
3953 VOP_UNLOCK(vp, 0);
3954 foffset_unlock(fp, foffset, 0);
3955 fdrop(fp, td);
3956 return (error);
3957 }
3958 if (uap->count == auio.uio_resid &&
3959 (vp->v_vflag & VV_ROOT) &&
3960 (vp->v_mount->mnt_flag & MNT_UNION)) {
3961 struct vnode *tvp = vp;
3962 vp = vp->v_mount->mnt_vnodecovered;
3963 VREF(vp);
3964 fp->f_vnode = vp;
3965 fp->f_data = vp;
3966 foffset = 0;
3967 vput(tvp);
3968 goto unionread;
3969 }
3970 VOP_UNLOCK(vp, 0);
3971 foffset_unlock(fp, foffset, 0);
3972 fdrop(fp, td);
3973 td->td_retval[0] = uap->count - auio.uio_resid;
3974 if (error == 0)
3975 *ploff = loff;
3976 return (error);
3977 }
3978 #endif /* COMPAT_43 */
3979
3980 /*
3981 * Read a block of directory entries in a filesystem independent format.
3982 */
3983 #ifndef _SYS_SYSPROTO_H_
3984 struct getdirentries_args {
3985 int fd;
3986 char *buf;
3987 u_int count;
3988 long *basep;
3989 };
3990 #endif
3991 int
3992 sys_getdirentries(td, uap)
3993 struct thread *td;
3994 register struct getdirentries_args /* {
3995 int fd;
3996 char *buf;
3997 u_int count;
3998 long *basep;
3999 } */ *uap;
4000 {
4001 long base;
4002 int error;
4003
4004 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
4005 NULL, UIO_USERSPACE);
4006 if (error != 0)
4007 return (error);
4008 if (uap->basep != NULL)
4009 error = copyout(&base, uap->basep, sizeof(long));
4010 return (error);
4011 }
4012
4013 int
4014 kern_getdirentries(struct thread *td, int fd, char *buf, u_int count,
4015 long *basep, ssize_t *residp, enum uio_seg bufseg)
4016 {
4017 struct vnode *vp;
4018 struct file *fp;
4019 struct uio auio;
4020 struct iovec aiov;
4021 cap_rights_t rights;
4022 long loff;
4023 int error, eofflag;
4024 off_t foffset;
4025
4026 AUDIT_ARG_FD(fd);
4027 if (count > IOSIZE_MAX)
4028 return (EINVAL);
4029 auio.uio_resid = count;
4030 error = getvnode(td->td_proc->p_fd, fd,
4031 cap_rights_init(&rights, CAP_READ), &fp);
4032 if (error != 0)
4033 return (error);
4034 if ((fp->f_flag & FREAD) == 0) {
4035 fdrop(fp, td);
4036 return (EBADF);
4037 }
4038 vp = fp->f_vnode;
4039 foffset = foffset_lock(fp, 0);
4040 unionread:
4041 if (vp->v_type != VDIR) {
4042 error = EINVAL;
4043 goto fail;
4044 }
4045 aiov.iov_base = buf;
4046 aiov.iov_len = count;
4047 auio.uio_iov = &aiov;
4048 auio.uio_iovcnt = 1;
4049 auio.uio_rw = UIO_READ;
4050 auio.uio_segflg = bufseg;
4051 auio.uio_td = td;
4052 vn_lock(vp, LK_SHARED | LK_RETRY);
4053 AUDIT_ARG_VNODE1(vp);
4054 loff = auio.uio_offset = foffset;
4055 #ifdef MAC
4056 error = mac_vnode_check_readdir(td->td_ucred, vp);
4057 if (error == 0)
4058 #endif
4059 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4060 NULL);
4061 foffset = auio.uio_offset;
4062 if (error != 0) {
4063 VOP_UNLOCK(vp, 0);
4064 goto fail;
4065 }
4066 if (count == auio.uio_resid &&
4067 (vp->v_vflag & VV_ROOT) &&
4068 (vp->v_mount->mnt_flag & MNT_UNION)) {
4069 struct vnode *tvp = vp;
4070
4071 vp = vp->v_mount->mnt_vnodecovered;
4072 VREF(vp);
4073 fp->f_vnode = vp;
4074 fp->f_data = vp;
4075 foffset = 0;
4076 vput(tvp);
4077 goto unionread;
4078 }
4079 VOP_UNLOCK(vp, 0);
4080 *basep = loff;
4081 if (residp != NULL)
4082 *residp = auio.uio_resid;
4083 td->td_retval[0] = count - auio.uio_resid;
4084 fail:
4085 foffset_unlock(fp, foffset, 0);
4086 fdrop(fp, td);
4087 return (error);
4088 }
4089
4090 #ifndef _SYS_SYSPROTO_H_
4091 struct getdents_args {
4092 int fd;
4093 char *buf;
4094 size_t count;
4095 };
4096 #endif
4097 int
4098 sys_getdents(td, uap)
4099 struct thread *td;
4100 register struct getdents_args /* {
4101 int fd;
4102 char *buf;
4103 u_int count;
4104 } */ *uap;
4105 {
4106 struct getdirentries_args ap;
4107
4108 ap.fd = uap->fd;
4109 ap.buf = uap->buf;
4110 ap.count = uap->count;
4111 ap.basep = NULL;
4112 return (sys_getdirentries(td, &ap));
4113 }
4114
4115 /*
4116 * Set the mode mask for creation of filesystem nodes.
4117 */
4118 #ifndef _SYS_SYSPROTO_H_
4119 struct umask_args {
4120 int newmask;
4121 };
4122 #endif
4123 int
4124 sys_umask(td, uap)
4125 struct thread *td;
4126 struct umask_args /* {
4127 int newmask;
4128 } */ *uap;
4129 {
4130 register struct filedesc *fdp;
4131
4132 FILEDESC_XLOCK(td->td_proc->p_fd);
4133 fdp = td->td_proc->p_fd;
4134 td->td_retval[0] = fdp->fd_cmask;
4135 fdp->fd_cmask = uap->newmask & ALLPERMS;
4136 FILEDESC_XUNLOCK(td->td_proc->p_fd);
4137 return (0);
4138 }
4139
4140 /*
4141 * Void all references to file by ripping underlying filesystem away from
4142 * vnode.
4143 */
4144 #ifndef _SYS_SYSPROTO_H_
4145 struct revoke_args {
4146 char *path;
4147 };
4148 #endif
4149 int
4150 sys_revoke(td, uap)
4151 struct thread *td;
4152 register struct revoke_args /* {
4153 char *path;
4154 } */ *uap;
4155 {
4156 struct vnode *vp;
4157 struct vattr vattr;
4158 struct nameidata nd;
4159 int error;
4160
4161 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4162 uap->path, td);
4163 if ((error = namei(&nd)) != 0)
4164 return (error);
4165 vp = nd.ni_vp;
4166 NDFREE(&nd, NDF_ONLY_PNBUF);
4167 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4168 error = EINVAL;
4169 goto out;
4170 }
4171 #ifdef MAC
4172 error = mac_vnode_check_revoke(td->td_ucred, vp);
4173 if (error != 0)
4174 goto out;
4175 #endif
4176 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4177 if (error != 0)
4178 goto out;
4179 if (td->td_ucred->cr_uid != vattr.va_uid) {
4180 error = priv_check(td, PRIV_VFS_ADMIN);
4181 if (error != 0)
4182 goto out;
4183 }
4184 if (vcount(vp) > 1)
4185 VOP_REVOKE(vp, REVOKEALL);
4186 out:
4187 vput(vp);
4188 return (error);
4189 }
4190
4191 /*
4192 * Convert a user file descriptor to a kernel file entry and check that, if it
4193 * is a capability, the correct rights are present. A reference on the file
4194 * entry is held upon returning.
4195 */
4196 int
4197 getvnode(struct filedesc *fdp, int fd, cap_rights_t *rightsp, struct file **fpp)
4198 {
4199 struct file *fp;
4200 int error;
4201
4202 error = fget_unlocked(fdp, fd, rightsp, 0, &fp, NULL);
4203 if (error != 0)
4204 return (error);
4205
4206 /*
4207 * The file could be not of the vnode type, or it may be not
4208 * yet fully initialized, in which case the f_vnode pointer
4209 * may be set, but f_ops is still badfileops. E.g.,
4210 * devfs_open() transiently create such situation to
4211 * facilitate csw d_fdopen().
4212 *
4213 * Dupfdopen() handling in kern_openat() installs the
4214 * half-baked file into the process descriptor table, allowing
4215 * other thread to dereference it. Guard against the race by
4216 * checking f_ops.
4217 */
4218 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
4219 fdrop(fp, curthread);
4220 return (EINVAL);
4221 }
4222 *fpp = fp;
4223 return (0);
4224 }
4225
4226
4227 /*
4228 * Get an (NFS) file handle.
4229 */
4230 #ifndef _SYS_SYSPROTO_H_
4231 struct lgetfh_args {
4232 char *fname;
4233 fhandle_t *fhp;
4234 };
4235 #endif
4236 int
4237 sys_lgetfh(td, uap)
4238 struct thread *td;
4239 register struct lgetfh_args *uap;
4240 {
4241 struct nameidata nd;
4242 fhandle_t fh;
4243 register struct vnode *vp;
4244 int error;
4245
4246 error = priv_check(td, PRIV_VFS_GETFH);
4247 if (error != 0)
4248 return (error);
4249 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4250 uap->fname, td);
4251 error = namei(&nd);
4252 if (error != 0)
4253 return (error);
4254 NDFREE(&nd, NDF_ONLY_PNBUF);
4255 vp = nd.ni_vp;
4256 bzero(&fh, sizeof(fh));
4257 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4258 error = VOP_VPTOFH(vp, &fh.fh_fid);
4259 vput(vp);
4260 if (error == 0)
4261 error = copyout(&fh, uap->fhp, sizeof (fh));
4262 return (error);
4263 }
4264
4265 #ifndef _SYS_SYSPROTO_H_
4266 struct getfh_args {
4267 char *fname;
4268 fhandle_t *fhp;
4269 };
4270 #endif
4271 int
4272 sys_getfh(td, uap)
4273 struct thread *td;
4274 register struct getfh_args *uap;
4275 {
4276 struct nameidata nd;
4277 fhandle_t fh;
4278 register struct vnode *vp;
4279 int error;
4280
4281 error = priv_check(td, PRIV_VFS_GETFH);
4282 if (error != 0)
4283 return (error);
4284 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4285 uap->fname, td);
4286 error = namei(&nd);
4287 if (error != 0)
4288 return (error);
4289 NDFREE(&nd, NDF_ONLY_PNBUF);
4290 vp = nd.ni_vp;
4291 bzero(&fh, sizeof(fh));
4292 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4293 error = VOP_VPTOFH(vp, &fh.fh_fid);
4294 vput(vp);
4295 if (error == 0)
4296 error = copyout(&fh, uap->fhp, sizeof (fh));
4297 return (error);
4298 }
4299
4300 /*
4301 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4302 * open descriptor.
4303 *
4304 * warning: do not remove the priv_check() call or this becomes one giant
4305 * security hole.
4306 */
4307 #ifndef _SYS_SYSPROTO_H_
4308 struct fhopen_args {
4309 const struct fhandle *u_fhp;
4310 int flags;
4311 };
4312 #endif
4313 int
4314 sys_fhopen(td, uap)
4315 struct thread *td;
4316 struct fhopen_args /* {
4317 const struct fhandle *u_fhp;
4318 int flags;
4319 } */ *uap;
4320 {
4321 struct mount *mp;
4322 struct vnode *vp;
4323 struct fhandle fhp;
4324 struct file *fp;
4325 int fmode, error;
4326 int indx;
4327
4328 error = priv_check(td, PRIV_VFS_FHOPEN);
4329 if (error != 0)
4330 return (error);
4331 indx = -1;
4332 fmode = FFLAGS(uap->flags);
4333 /* why not allow a non-read/write open for our lockd? */
4334 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4335 return (EINVAL);
4336 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
4337 if (error != 0)
4338 return(error);
4339 /* find the mount point */
4340 mp = vfs_busyfs(&fhp.fh_fsid);
4341 if (mp == NULL)
4342 return (ESTALE);
4343 /* now give me my vnode, it gets returned to me locked */
4344 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4345 vfs_unbusy(mp);
4346 if (error != 0)
4347 return (error);
4348
4349 error = falloc_noinstall(td, &fp);
4350 if (error != 0) {
4351 vput(vp);
4352 return (error);
4353 }
4354 /*
4355 * An extra reference on `fp' has been held for us by
4356 * falloc_noinstall().
4357 */
4358
4359 #ifdef INVARIANTS
4360 td->td_dupfd = -1;
4361 #endif
4362 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4363 if (error != 0) {
4364 KASSERT(fp->f_ops == &badfileops,
4365 ("VOP_OPEN in fhopen() set f_ops"));
4366 KASSERT(td->td_dupfd < 0,
4367 ("fhopen() encountered fdopen()"));
4368
4369 vput(vp);
4370 goto bad;
4371 }
4372 #ifdef INVARIANTS
4373 td->td_dupfd = 0;
4374 #endif
4375 fp->f_vnode = vp;
4376 fp->f_seqcount = 1;
4377 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
4378 &vnops);
4379 VOP_UNLOCK(vp, 0);
4380 if ((fmode & O_TRUNC) != 0) {
4381 error = fo_truncate(fp, 0, td->td_ucred, td);
4382 if (error != 0)
4383 goto bad;
4384 }
4385
4386 error = finstall(td, fp, &indx, fmode, NULL);
4387 bad:
4388 fdrop(fp, td);
4389 td->td_retval[0] = indx;
4390 return (error);
4391 }
4392
4393 /*
4394 * Stat an (NFS) file handle.
4395 */
4396 #ifndef _SYS_SYSPROTO_H_
4397 struct fhstat_args {
4398 struct fhandle *u_fhp;
4399 struct stat *sb;
4400 };
4401 #endif
4402 int
4403 sys_fhstat(td, uap)
4404 struct thread *td;
4405 register struct fhstat_args /* {
4406 struct fhandle *u_fhp;
4407 struct stat *sb;
4408 } */ *uap;
4409 {
4410 struct stat sb;
4411 struct fhandle fh;
4412 int error;
4413
4414 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4415 if (error != 0)
4416 return (error);
4417 error = kern_fhstat(td, fh, &sb);
4418 if (error == 0)
4419 error = copyout(&sb, uap->sb, sizeof(sb));
4420 return (error);
4421 }
4422
4423 int
4424 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4425 {
4426 struct mount *mp;
4427 struct vnode *vp;
4428 int error;
4429
4430 error = priv_check(td, PRIV_VFS_FHSTAT);
4431 if (error != 0)
4432 return (error);
4433 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4434 return (ESTALE);
4435 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4436 vfs_unbusy(mp);
4437 if (error != 0)
4438 return (error);
4439 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
4440 vput(vp);
4441 return (error);
4442 }
4443
4444 /*
4445 * Implement fstatfs() for (NFS) file handles.
4446 */
4447 #ifndef _SYS_SYSPROTO_H_
4448 struct fhstatfs_args {
4449 struct fhandle *u_fhp;
4450 struct statfs *buf;
4451 };
4452 #endif
4453 int
4454 sys_fhstatfs(td, uap)
4455 struct thread *td;
4456 struct fhstatfs_args /* {
4457 struct fhandle *u_fhp;
4458 struct statfs *buf;
4459 } */ *uap;
4460 {
4461 struct statfs sf;
4462 fhandle_t fh;
4463 int error;
4464
4465 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4466 if (error != 0)
4467 return (error);
4468 error = kern_fhstatfs(td, fh, &sf);
4469 if (error != 0)
4470 return (error);
4471 return (copyout(&sf, uap->buf, sizeof(sf)));
4472 }
4473
4474 int
4475 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4476 {
4477 struct statfs *sp;
4478 struct mount *mp;
4479 struct vnode *vp;
4480 int error;
4481
4482 error = priv_check(td, PRIV_VFS_FHSTATFS);
4483 if (error != 0)
4484 return (error);
4485 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4486 return (ESTALE);
4487 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4488 if (error != 0) {
4489 vfs_unbusy(mp);
4490 return (error);
4491 }
4492 vput(vp);
4493 error = prison_canseemount(td->td_ucred, mp);
4494 if (error != 0)
4495 goto out;
4496 #ifdef MAC
4497 error = mac_mount_check_stat(td->td_ucred, mp);
4498 if (error != 0)
4499 goto out;
4500 #endif
4501 /*
4502 * Set these in case the underlying filesystem fails to do so.
4503 */
4504 sp = &mp->mnt_stat;
4505 sp->f_version = STATFS_VERSION;
4506 sp->f_namemax = NAME_MAX;
4507 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4508 error = VFS_STATFS(mp, sp);
4509 if (error == 0)
4510 *buf = *sp;
4511 out:
4512 vfs_unbusy(mp);
4513 return (error);
4514 }
4515
4516 int
4517 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
4518 {
4519 struct file *fp;
4520 struct mount *mp;
4521 struct vnode *vp;
4522 cap_rights_t rights;
4523 off_t olen, ooffset;
4524 int error;
4525
4526 fp = NULL;
4527 error = fget(td, fd, cap_rights_init(&rights, CAP_WRITE), &fp);
4528 if (error != 0)
4529 goto out;
4530
4531 switch (fp->f_type) {
4532 case DTYPE_VNODE:
4533 break;
4534 case DTYPE_PIPE:
4535 case DTYPE_FIFO:
4536 error = ESPIPE;
4537 goto out;
4538 default:
4539 error = ENODEV;
4540 goto out;
4541 }
4542 if ((fp->f_flag & FWRITE) == 0) {
4543 error = EBADF;
4544 goto out;
4545 }
4546 vp = fp->f_vnode;
4547 if (vp->v_type != VREG) {
4548 error = ENODEV;
4549 goto out;
4550 }
4551 if (offset < 0 || len <= 0) {
4552 error = EINVAL;
4553 goto out;
4554 }
4555 /* Check for wrap. */
4556 if (offset > OFF_MAX - len) {
4557 error = EFBIG;
4558 goto out;
4559 }
4560
4561 /* Allocating blocks may take a long time, so iterate. */
4562 for (;;) {
4563 olen = len;
4564 ooffset = offset;
4565
4566 bwillwrite();
4567 mp = NULL;
4568 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
4569 if (error != 0)
4570 break;
4571 error = vn_lock(vp, LK_EXCLUSIVE);
4572 if (error != 0) {
4573 vn_finished_write(mp);
4574 break;
4575 }
4576 #ifdef MAC
4577 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
4578 if (error == 0)
4579 #endif
4580 error = VOP_ALLOCATE(vp, &offset, &len);
4581 VOP_UNLOCK(vp, 0);
4582 vn_finished_write(mp);
4583
4584 if (olen + ooffset != offset + len) {
4585 panic("offset + len changed from %jx/%jx to %jx/%jx",
4586 ooffset, olen, offset, len);
4587 }
4588 if (error != 0 || len == 0)
4589 break;
4590 KASSERT(olen > len, ("Iteration did not make progress?"));
4591 maybe_yield();
4592 }
4593 out:
4594 if (fp != NULL)
4595 fdrop(fp, td);
4596 return (error);
4597 }
4598
4599 int
4600 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
4601 {
4602
4603 td->td_retval[0] = kern_posix_fallocate(td, uap->fd, uap->offset,
4604 uap->len);
4605 return (0);
4606 }
4607
4608 /*
4609 * Unlike madvise(2), we do not make a best effort to remember every
4610 * possible caching hint. Instead, we remember the last setting with
4611 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4612 * region of any current setting.
4613 */
4614 int
4615 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4616 int advice)
4617 {
4618 struct fadvise_info *fa, *new;
4619 struct file *fp;
4620 struct vnode *vp;
4621 cap_rights_t rights;
4622 off_t end;
4623 int error;
4624
4625 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4626 return (EINVAL);
4627 switch (advice) {
4628 case POSIX_FADV_SEQUENTIAL:
4629 case POSIX_FADV_RANDOM:
4630 case POSIX_FADV_NOREUSE:
4631 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4632 break;
4633 case POSIX_FADV_NORMAL:
4634 case POSIX_FADV_WILLNEED:
4635 case POSIX_FADV_DONTNEED:
4636 new = NULL;
4637 break;
4638 default:
4639 return (EINVAL);
4640 }
4641 /* XXX: CAP_POSIX_FADVISE? */
4642 error = fget(td, fd, cap_rights_init(&rights), &fp);
4643 if (error != 0)
4644 goto out;
4645
4646 switch (fp->f_type) {
4647 case DTYPE_VNODE:
4648 break;
4649 case DTYPE_PIPE:
4650 case DTYPE_FIFO:
4651 error = ESPIPE;
4652 goto out;
4653 default:
4654 error = ENODEV;
4655 goto out;
4656 }
4657 vp = fp->f_vnode;
4658 if (vp->v_type != VREG) {
4659 error = ENODEV;
4660 goto out;
4661 }
4662 if (len == 0)
4663 end = OFF_MAX;
4664 else
4665 end = offset + len - 1;
4666 switch (advice) {
4667 case POSIX_FADV_SEQUENTIAL:
4668 case POSIX_FADV_RANDOM:
4669 case POSIX_FADV_NOREUSE:
4670 /*
4671 * Try to merge any existing non-standard region with
4672 * this new region if possible, otherwise create a new
4673 * non-standard region for this request.
4674 */
4675 mtx_pool_lock(mtxpool_sleep, fp);
4676 fa = fp->f_advice;
4677 if (fa != NULL && fa->fa_advice == advice &&
4678 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4679 (end != OFF_MAX && fa->fa_start == end + 1) ||
4680 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4681 if (offset < fa->fa_start)
4682 fa->fa_start = offset;
4683 if (end > fa->fa_end)
4684 fa->fa_end = end;
4685 } else {
4686 new->fa_advice = advice;
4687 new->fa_start = offset;
4688 new->fa_end = end;
4689 new->fa_prevstart = 0;
4690 new->fa_prevend = 0;
4691 fp->f_advice = new;
4692 new = fa;
4693 }
4694 mtx_pool_unlock(mtxpool_sleep, fp);
4695 break;
4696 case POSIX_FADV_NORMAL:
4697 /*
4698 * If a the "normal" region overlaps with an existing
4699 * non-standard region, trim or remove the
4700 * non-standard region.
4701 */
4702 mtx_pool_lock(mtxpool_sleep, fp);
4703 fa = fp->f_advice;
4704 if (fa != NULL) {
4705 if (offset <= fa->fa_start && end >= fa->fa_end) {
4706 new = fa;
4707 fp->f_advice = NULL;
4708 } else if (offset <= fa->fa_start &&
4709 end >= fa->fa_start)
4710 fa->fa_start = end + 1;
4711 else if (offset <= fa->fa_end && end >= fa->fa_end)
4712 fa->fa_end = offset - 1;
4713 else if (offset >= fa->fa_start && end <= fa->fa_end) {
4714 /*
4715 * If the "normal" region is a middle
4716 * portion of the existing
4717 * non-standard region, just remove
4718 * the whole thing rather than picking
4719 * one side or the other to
4720 * preserve.
4721 */
4722 new = fa;
4723 fp->f_advice = NULL;
4724 }
4725 }
4726 mtx_pool_unlock(mtxpool_sleep, fp);
4727 break;
4728 case POSIX_FADV_WILLNEED:
4729 case POSIX_FADV_DONTNEED:
4730 error = VOP_ADVISE(vp, offset, end, advice);
4731 break;
4732 }
4733 out:
4734 if (fp != NULL)
4735 fdrop(fp, td);
4736 free(new, M_FADVISE);
4737 return (error);
4738 }
4739
4740 int
4741 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4742 {
4743
4744 td->td_retval[0] = kern_posix_fadvise(td, uap->fd, uap->offset,
4745 uap->len, uap->advice);
4746 return (0);
4747 }
Cache object: cf50187e7213c4d996835beec50bacae
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