1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 #include "opt_capsicum.h"
43 #include "opt_ktrace.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/bio.h>
48 #include <sys/buf.h>
49 #include <sys/capsicum.h>
50 #include <sys/disk.h>
51 #include <sys/sysent.h>
52 #include <sys/malloc.h>
53 #include <sys/mount.h>
54 #include <sys/mutex.h>
55 #include <sys/sysproto.h>
56 #include <sys/namei.h>
57 #include <sys/filedesc.h>
58 #include <sys/kernel.h>
59 #include <sys/fcntl.h>
60 #include <sys/file.h>
61 #include <sys/filio.h>
62 #include <sys/limits.h>
63 #include <sys/linker.h>
64 #include <sys/rwlock.h>
65 #include <sys/sdt.h>
66 #include <sys/stat.h>
67 #include <sys/sx.h>
68 #include <sys/unistd.h>
69 #include <sys/vnode.h>
70 #include <sys/priv.h>
71 #include <sys/proc.h>
72 #include <sys/dirent.h>
73 #include <sys/jail.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysctl.h>
76 #ifdef KTRACE
77 #include <sys/ktrace.h>
78 #endif
79
80 #include <machine/stdarg.h>
81
82 #include <security/audit/audit.h>
83 #include <security/mac/mac_framework.h>
84
85 #include <vm/vm.h>
86 #include <vm/vm_object.h>
87 #include <vm/vm_page.h>
88 #include <vm/uma.h>
89
90 #include <ufs/ufs/quota.h>
91
92 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
93
94 SDT_PROVIDER_DEFINE(vfs);
95 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int");
96 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int");
97
98 static int kern_chflagsat(struct thread *td, int fd, const char *path,
99 enum uio_seg pathseg, u_long flags, int atflag);
100 static int setfflags(struct thread *td, struct vnode *, u_long);
101 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
102 static int getutimens(const struct timespec *, enum uio_seg,
103 struct timespec *, int *);
104 static int setutimes(struct thread *td, struct vnode *,
105 const struct timespec *, int, int);
106 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
107 struct thread *td);
108 static int kern_fhlinkat(struct thread *td, int fd, const char *path,
109 enum uio_seg pathseg, fhandle_t *fhp);
110 static int kern_getfhat(struct thread *td, int flags, int fd,
111 const char *path, enum uio_seg pathseg, fhandle_t *fhp);
112 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg,
113 size_t count, struct thread *td);
114 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd,
115 const char *path, enum uio_seg segflag);
116
117 /*
118 * Sync each mounted filesystem.
119 */
120 #ifndef _SYS_SYSPROTO_H_
121 struct sync_args {
122 int dummy;
123 };
124 #endif
125 /* ARGSUSED */
126 int
sys_sync(struct thread * td,struct sync_args * uap)127 sys_sync(struct thread *td, struct sync_args *uap)
128 {
129 struct mount *mp, *nmp;
130 int save;
131
132 mtx_lock(&mountlist_mtx);
133 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
134 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
135 nmp = TAILQ_NEXT(mp, mnt_list);
136 continue;
137 }
138 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
139 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
140 save = curthread_pflags_set(TDP_SYNCIO);
141 vfs_msync(mp, MNT_NOWAIT);
142 VFS_SYNC(mp, MNT_NOWAIT);
143 curthread_pflags_restore(save);
144 vn_finished_write(mp);
145 }
146 mtx_lock(&mountlist_mtx);
147 nmp = TAILQ_NEXT(mp, mnt_list);
148 vfs_unbusy(mp);
149 }
150 mtx_unlock(&mountlist_mtx);
151 return (0);
152 }
153
154 /*
155 * Change filesystem quotas.
156 */
157 #ifndef _SYS_SYSPROTO_H_
158 struct quotactl_args {
159 char *path;
160 int cmd;
161 int uid;
162 caddr_t arg;
163 };
164 #endif
165 int
sys_quotactl(struct thread * td,struct quotactl_args * uap)166 sys_quotactl(struct thread *td, struct quotactl_args *uap)
167 {
168 struct mount *mp;
169 struct nameidata nd;
170 int error;
171
172 AUDIT_ARG_CMD(uap->cmd);
173 AUDIT_ARG_UID(uap->uid);
174 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
175 return (EPERM);
176 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
177 uap->path, td);
178 if ((error = namei(&nd)) != 0)
179 return (error);
180 NDFREE(&nd, NDF_ONLY_PNBUF);
181 mp = nd.ni_vp->v_mount;
182 vfs_ref(mp);
183 vput(nd.ni_vp);
184 error = vfs_busy(mp, 0);
185 vfs_rel(mp);
186 if (error != 0)
187 return (error);
188 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
189
190 /*
191 * Since quota on operation typically needs to open quota
192 * file, the Q_QUOTAON handler needs to unbusy the mount point
193 * before calling into namei. Otherwise, unmount might be
194 * started between two vfs_busy() invocations (first is our,
195 * second is from mount point cross-walk code in lookup()),
196 * causing deadlock.
197 *
198 * Require that Q_QUOTAON handles the vfs_busy() reference on
199 * its own, always returning with ubusied mount point.
200 */
201 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON &&
202 (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF)
203 vfs_unbusy(mp);
204 return (error);
205 }
206
207 /*
208 * Used by statfs conversion routines to scale the block size up if
209 * necessary so that all of the block counts are <= 'max_size'. Note
210 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
211 * value of 'n'.
212 */
213 void
statfs_scale_blocks(struct statfs * sf,long max_size)214 statfs_scale_blocks(struct statfs *sf, long max_size)
215 {
216 uint64_t count;
217 int shift;
218
219 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
220
221 /*
222 * Attempt to scale the block counts to give a more accurate
223 * overview to userland of the ratio of free space to used
224 * space. To do this, find the largest block count and compute
225 * a divisor that lets it fit into a signed integer <= max_size.
226 */
227 if (sf->f_bavail < 0)
228 count = -sf->f_bavail;
229 else
230 count = sf->f_bavail;
231 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
232 if (count <= max_size)
233 return;
234
235 count >>= flsl(max_size);
236 shift = 0;
237 while (count > 0) {
238 shift++;
239 count >>=1;
240 }
241
242 sf->f_bsize <<= shift;
243 sf->f_blocks >>= shift;
244 sf->f_bfree >>= shift;
245 sf->f_bavail >>= shift;
246 }
247
248 static int
kern_do_statfs(struct thread * td,struct mount * mp,struct statfs * buf)249 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
250 {
251 struct statfs *sp;
252 int error;
253
254 if (mp == NULL)
255 return (EBADF);
256 error = vfs_busy(mp, 0);
257 vfs_rel(mp);
258 if (error != 0)
259 return (error);
260 #ifdef MAC
261 error = mac_mount_check_stat(td->td_ucred, mp);
262 if (error != 0)
263 goto out;
264 #endif
265 /*
266 * Set these in case the underlying filesystem fails to do so.
267 */
268 sp = &mp->mnt_stat;
269 sp->f_version = STATFS_VERSION;
270 sp->f_namemax = NAME_MAX;
271 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
272 error = VFS_STATFS(mp, sp);
273 if (error != 0)
274 goto out;
275 *buf = *sp;
276 if (priv_check(td, PRIV_VFS_GENERATION)) {
277 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
278 prison_enforce_statfs(td->td_ucred, mp, buf);
279 }
280 out:
281 vfs_unbusy(mp);
282 return (error);
283 }
284
285 /*
286 * Get filesystem statistics.
287 */
288 #ifndef _SYS_SYSPROTO_H_
289 struct statfs_args {
290 char *path;
291 struct statfs *buf;
292 };
293 #endif
294 int
sys_statfs(struct thread * td,struct statfs_args * uap)295 sys_statfs(struct thread *td, struct statfs_args *uap)
296 {
297 struct statfs *sfp;
298 int error;
299
300 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
301 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
302 if (error == 0)
303 error = copyout(sfp, uap->buf, sizeof(struct statfs));
304 free(sfp, M_STATFS);
305 return (error);
306 }
307
308 int
kern_statfs(struct thread * td,char * path,enum uio_seg pathseg,struct statfs * buf)309 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
310 struct statfs *buf)
311 {
312 struct mount *mp;
313 struct nameidata nd;
314 int error;
315
316 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
317 pathseg, path, td);
318 error = namei(&nd);
319 if (error != 0)
320 return (error);
321 mp = nd.ni_vp->v_mount;
322 vfs_ref(mp);
323 NDFREE(&nd, NDF_ONLY_PNBUF);
324 vput(nd.ni_vp);
325 return (kern_do_statfs(td, mp, buf));
326 }
327
328 /*
329 * Get filesystem statistics.
330 */
331 #ifndef _SYS_SYSPROTO_H_
332 struct fstatfs_args {
333 int fd;
334 struct statfs *buf;
335 };
336 #endif
337 int
sys_fstatfs(struct thread * td,struct fstatfs_args * uap)338 sys_fstatfs(struct thread *td, struct fstatfs_args *uap)
339 {
340 struct statfs *sfp;
341 int error;
342
343 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
344 error = kern_fstatfs(td, uap->fd, sfp);
345 if (error == 0)
346 error = copyout(sfp, uap->buf, sizeof(struct statfs));
347 free(sfp, M_STATFS);
348 return (error);
349 }
350
351 int
kern_fstatfs(struct thread * td,int fd,struct statfs * buf)352 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
353 {
354 struct file *fp;
355 struct mount *mp;
356 struct vnode *vp;
357 int error;
358
359 AUDIT_ARG_FD(fd);
360 error = getvnode(td, fd, &cap_fstatfs_rights, &fp);
361 if (error != 0)
362 return (error);
363 vp = fp->f_vnode;
364 vn_lock(vp, LK_SHARED | LK_RETRY);
365 #ifdef AUDIT
366 AUDIT_ARG_VNODE1(vp);
367 #endif
368 mp = vp->v_mount;
369 if (mp != NULL)
370 vfs_ref(mp);
371 VOP_UNLOCK(vp, 0);
372 fdrop(fp, td);
373 return (kern_do_statfs(td, mp, buf));
374 }
375
376 /*
377 * Get statistics on all filesystems.
378 */
379 #ifndef _SYS_SYSPROTO_H_
380 struct getfsstat_args {
381 struct statfs *buf;
382 long bufsize;
383 int mode;
384 };
385 #endif
386 int
sys_getfsstat(struct thread * td,struct getfsstat_args * uap)387 sys_getfsstat(struct thread *td, struct getfsstat_args *uap)
388 {
389 size_t count;
390 int error;
391
392 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX)
393 return (EINVAL);
394 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count,
395 UIO_USERSPACE, uap->mode);
396 if (error == 0)
397 td->td_retval[0] = count;
398 return (error);
399 }
400
401 /*
402 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
403 * The caller is responsible for freeing memory which will be allocated
404 * in '*buf'.
405 */
406 int
kern_getfsstat(struct thread * td,struct statfs ** buf,size_t bufsize,size_t * countp,enum uio_seg bufseg,int mode)407 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
408 size_t *countp, enum uio_seg bufseg, int mode)
409 {
410 struct mount *mp, *nmp;
411 struct statfs *sfsp, *sp, *sptmp, *tofree;
412 size_t count, maxcount;
413 int error;
414
415 switch (mode) {
416 case MNT_WAIT:
417 case MNT_NOWAIT:
418 break;
419 default:
420 if (bufseg == UIO_SYSSPACE)
421 *buf = NULL;
422 return (EINVAL);
423 }
424 restart:
425 maxcount = bufsize / sizeof(struct statfs);
426 if (bufsize == 0) {
427 sfsp = NULL;
428 tofree = NULL;
429 } else if (bufseg == UIO_USERSPACE) {
430 sfsp = *buf;
431 tofree = NULL;
432 } else /* if (bufseg == UIO_SYSSPACE) */ {
433 count = 0;
434 mtx_lock(&mountlist_mtx);
435 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
436 count++;
437 }
438 mtx_unlock(&mountlist_mtx);
439 if (maxcount > count)
440 maxcount = count;
441 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs),
442 M_STATFS, M_WAITOK);
443 }
444 count = 0;
445 mtx_lock(&mountlist_mtx);
446 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
447 if (prison_canseemount(td->td_ucred, mp) != 0) {
448 nmp = TAILQ_NEXT(mp, mnt_list);
449 continue;
450 }
451 #ifdef MAC
452 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
453 nmp = TAILQ_NEXT(mp, mnt_list);
454 continue;
455 }
456 #endif
457 if (mode == MNT_WAIT) {
458 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) {
459 /*
460 * If vfs_busy() failed, and MBF_NOWAIT
461 * wasn't passed, then the mp is gone.
462 * Furthermore, because of MBF_MNTLSTLOCK,
463 * the mountlist_mtx was dropped. We have
464 * no other choice than to start over.
465 */
466 mtx_unlock(&mountlist_mtx);
467 free(tofree, M_STATFS);
468 goto restart;
469 }
470 } else {
471 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
472 nmp = TAILQ_NEXT(mp, mnt_list);
473 continue;
474 }
475 }
476 if (sfsp != NULL && count < maxcount) {
477 sp = &mp->mnt_stat;
478 /*
479 * Set these in case the underlying filesystem
480 * fails to do so.
481 */
482 sp->f_version = STATFS_VERSION;
483 sp->f_namemax = NAME_MAX;
484 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
485 /*
486 * If MNT_NOWAIT is specified, do not refresh
487 * the fsstat cache.
488 */
489 if (mode != MNT_NOWAIT) {
490 error = VFS_STATFS(mp, sp);
491 if (error != 0) {
492 mtx_lock(&mountlist_mtx);
493 nmp = TAILQ_NEXT(mp, mnt_list);
494 vfs_unbusy(mp);
495 continue;
496 }
497 }
498 if (priv_check(td, PRIV_VFS_GENERATION)) {
499 sptmp = malloc(sizeof(struct statfs), M_STATFS,
500 M_WAITOK);
501 *sptmp = *sp;
502 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0;
503 prison_enforce_statfs(td->td_ucred, mp, sptmp);
504 sp = sptmp;
505 } else
506 sptmp = NULL;
507 if (bufseg == UIO_SYSSPACE) {
508 bcopy(sp, sfsp, sizeof(*sp));
509 free(sptmp, M_STATFS);
510 } else /* if (bufseg == UIO_USERSPACE) */ {
511 error = copyout(sp, sfsp, sizeof(*sp));
512 free(sptmp, M_STATFS);
513 if (error != 0) {
514 vfs_unbusy(mp);
515 return (error);
516 }
517 }
518 sfsp++;
519 }
520 count++;
521 mtx_lock(&mountlist_mtx);
522 nmp = TAILQ_NEXT(mp, mnt_list);
523 vfs_unbusy(mp);
524 }
525 mtx_unlock(&mountlist_mtx);
526 if (sfsp != NULL && count > maxcount)
527 *countp = maxcount;
528 else
529 *countp = count;
530 return (0);
531 }
532
533 #ifdef COMPAT_FREEBSD4
534 /*
535 * Get old format filesystem statistics.
536 */
537 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *);
538
539 #ifndef _SYS_SYSPROTO_H_
540 struct freebsd4_statfs_args {
541 char *path;
542 struct ostatfs *buf;
543 };
544 #endif
545 int
freebsd4_statfs(struct thread * td,struct freebsd4_statfs_args * uap)546 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap)
547 {
548 struct ostatfs osb;
549 struct statfs *sfp;
550 int error;
551
552 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
553 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
554 if (error == 0) {
555 freebsd4_cvtstatfs(sfp, &osb);
556 error = copyout(&osb, uap->buf, sizeof(osb));
557 }
558 free(sfp, M_STATFS);
559 return (error);
560 }
561
562 /*
563 * Get filesystem statistics.
564 */
565 #ifndef _SYS_SYSPROTO_H_
566 struct freebsd4_fstatfs_args {
567 int fd;
568 struct ostatfs *buf;
569 };
570 #endif
571 int
freebsd4_fstatfs(struct thread * td,struct freebsd4_fstatfs_args * uap)572 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap)
573 {
574 struct ostatfs osb;
575 struct statfs *sfp;
576 int error;
577
578 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
579 error = kern_fstatfs(td, uap->fd, sfp);
580 if (error == 0) {
581 freebsd4_cvtstatfs(sfp, &osb);
582 error = copyout(&osb, uap->buf, sizeof(osb));
583 }
584 free(sfp, M_STATFS);
585 return (error);
586 }
587
588 /*
589 * Get statistics on all filesystems.
590 */
591 #ifndef _SYS_SYSPROTO_H_
592 struct freebsd4_getfsstat_args {
593 struct ostatfs *buf;
594 long bufsize;
595 int mode;
596 };
597 #endif
598 int
freebsd4_getfsstat(struct thread * td,struct freebsd4_getfsstat_args * uap)599 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap)
600 {
601 struct statfs *buf, *sp;
602 struct ostatfs osb;
603 size_t count, size;
604 int error;
605
606 if (uap->bufsize < 0)
607 return (EINVAL);
608 count = uap->bufsize / sizeof(struct ostatfs);
609 if (count > SIZE_MAX / sizeof(struct statfs))
610 return (EINVAL);
611 size = count * sizeof(struct statfs);
612 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
613 uap->mode);
614 if (error == 0)
615 td->td_retval[0] = count;
616 if (size != 0) {
617 sp = buf;
618 while (count != 0 && error == 0) {
619 freebsd4_cvtstatfs(sp, &osb);
620 error = copyout(&osb, uap->buf, sizeof(osb));
621 sp++;
622 uap->buf++;
623 count--;
624 }
625 free(buf, M_STATFS);
626 }
627 return (error);
628 }
629
630 /*
631 * Implement fstatfs() for (NFS) file handles.
632 */
633 #ifndef _SYS_SYSPROTO_H_
634 struct freebsd4_fhstatfs_args {
635 struct fhandle *u_fhp;
636 struct ostatfs *buf;
637 };
638 #endif
639 int
freebsd4_fhstatfs(struct thread * td,struct freebsd4_fhstatfs_args * uap)640 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap)
641 {
642 struct ostatfs osb;
643 struct statfs *sfp;
644 fhandle_t fh;
645 int error;
646
647 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
648 if (error != 0)
649 return (error);
650 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
651 error = kern_fhstatfs(td, fh, sfp);
652 if (error == 0) {
653 freebsd4_cvtstatfs(sfp, &osb);
654 error = copyout(&osb, uap->buf, sizeof(osb));
655 }
656 free(sfp, M_STATFS);
657 return (error);
658 }
659
660 /*
661 * Convert a new format statfs structure to an old format statfs structure.
662 */
663 static void
freebsd4_cvtstatfs(struct statfs * nsp,struct ostatfs * osp)664 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp)
665 {
666
667 statfs_scale_blocks(nsp, LONG_MAX);
668 bzero(osp, sizeof(*osp));
669 osp->f_bsize = nsp->f_bsize;
670 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
671 osp->f_blocks = nsp->f_blocks;
672 osp->f_bfree = nsp->f_bfree;
673 osp->f_bavail = nsp->f_bavail;
674 osp->f_files = MIN(nsp->f_files, LONG_MAX);
675 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
676 osp->f_owner = nsp->f_owner;
677 osp->f_type = nsp->f_type;
678 osp->f_flags = nsp->f_flags;
679 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
680 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
681 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
682 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
683 strlcpy(osp->f_fstypename, nsp->f_fstypename,
684 MIN(MFSNAMELEN, OMFSNAMELEN));
685 strlcpy(osp->f_mntonname, nsp->f_mntonname,
686 MIN(MNAMELEN, OMNAMELEN));
687 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
688 MIN(MNAMELEN, OMNAMELEN));
689 osp->f_fsid = nsp->f_fsid;
690 }
691 #endif /* COMPAT_FREEBSD4 */
692
693 #if defined(COMPAT_FREEBSD11)
694 /*
695 * Get old format filesystem statistics.
696 */
697 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *);
698
699 int
freebsd11_statfs(struct thread * td,struct freebsd11_statfs_args * uap)700 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap)
701 {
702 struct freebsd11_statfs osb;
703 struct statfs *sfp;
704 int error;
705
706 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
707 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
708 if (error == 0) {
709 freebsd11_cvtstatfs(sfp, &osb);
710 error = copyout(&osb, uap->buf, sizeof(osb));
711 }
712 free(sfp, M_STATFS);
713 return (error);
714 }
715
716 /*
717 * Get filesystem statistics.
718 */
719 int
freebsd11_fstatfs(struct thread * td,struct freebsd11_fstatfs_args * uap)720 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap)
721 {
722 struct freebsd11_statfs osb;
723 struct statfs *sfp;
724 int error;
725
726 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
727 error = kern_fstatfs(td, uap->fd, sfp);
728 if (error == 0) {
729 freebsd11_cvtstatfs(sfp, &osb);
730 error = copyout(&osb, uap->buf, sizeof(osb));
731 }
732 free(sfp, M_STATFS);
733 return (error);
734 }
735
736 /*
737 * Get statistics on all filesystems.
738 */
739 int
freebsd11_getfsstat(struct thread * td,struct freebsd11_getfsstat_args * uap)740 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap)
741 {
742 struct freebsd11_statfs osb;
743 struct statfs *buf, *sp;
744 size_t count, size;
745 int error;
746
747 count = uap->bufsize / sizeof(struct ostatfs);
748 size = count * sizeof(struct statfs);
749 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
750 uap->mode);
751 if (error == 0)
752 td->td_retval[0] = count;
753 if (size > 0) {
754 sp = buf;
755 while (count > 0 && error == 0) {
756 freebsd11_cvtstatfs(sp, &osb);
757 error = copyout(&osb, uap->buf, sizeof(osb));
758 sp++;
759 uap->buf++;
760 count--;
761 }
762 free(buf, M_STATFS);
763 }
764 return (error);
765 }
766
767 /*
768 * Implement fstatfs() for (NFS) file handles.
769 */
770 int
freebsd11_fhstatfs(struct thread * td,struct freebsd11_fhstatfs_args * uap)771 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap)
772 {
773 struct freebsd11_statfs osb;
774 struct statfs *sfp;
775 fhandle_t fh;
776 int error;
777
778 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
779 if (error)
780 return (error);
781 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
782 error = kern_fhstatfs(td, fh, sfp);
783 if (error == 0) {
784 freebsd11_cvtstatfs(sfp, &osb);
785 error = copyout(&osb, uap->buf, sizeof(osb));
786 }
787 free(sfp, M_STATFS);
788 return (error);
789 }
790
791 /*
792 * Convert a new format statfs structure to an old format statfs structure.
793 */
794 static void
freebsd11_cvtstatfs(struct statfs * nsp,struct freebsd11_statfs * osp)795 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp)
796 {
797
798 bzero(osp, sizeof(*osp));
799 osp->f_version = FREEBSD11_STATFS_VERSION;
800 osp->f_type = nsp->f_type;
801 osp->f_flags = nsp->f_flags;
802 osp->f_bsize = nsp->f_bsize;
803 osp->f_iosize = nsp->f_iosize;
804 osp->f_blocks = nsp->f_blocks;
805 osp->f_bfree = nsp->f_bfree;
806 osp->f_bavail = nsp->f_bavail;
807 osp->f_files = nsp->f_files;
808 osp->f_ffree = nsp->f_ffree;
809 osp->f_syncwrites = nsp->f_syncwrites;
810 osp->f_asyncwrites = nsp->f_asyncwrites;
811 osp->f_syncreads = nsp->f_syncreads;
812 osp->f_asyncreads = nsp->f_asyncreads;
813 osp->f_namemax = nsp->f_namemax;
814 osp->f_owner = nsp->f_owner;
815 osp->f_fsid = nsp->f_fsid;
816 strlcpy(osp->f_fstypename, nsp->f_fstypename,
817 MIN(MFSNAMELEN, sizeof(osp->f_fstypename)));
818 strlcpy(osp->f_mntonname, nsp->f_mntonname,
819 MIN(MNAMELEN, sizeof(osp->f_mntonname)));
820 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
821 MIN(MNAMELEN, sizeof(osp->f_mntfromname)));
822 }
823 #endif /* COMPAT_FREEBSD11 */
824
825 /*
826 * Change current working directory to a given file descriptor.
827 */
828 #ifndef _SYS_SYSPROTO_H_
829 struct fchdir_args {
830 int fd;
831 };
832 #endif
833 int
sys_fchdir(struct thread * td,struct fchdir_args * uap)834 sys_fchdir(struct thread *td, struct fchdir_args *uap)
835 {
836 struct vnode *vp, *tdp;
837 struct mount *mp;
838 struct file *fp;
839 int error;
840
841 AUDIT_ARG_FD(uap->fd);
842 error = getvnode(td, uap->fd, &cap_fchdir_rights,
843 &fp);
844 if (error != 0)
845 return (error);
846 vp = fp->f_vnode;
847 vrefact(vp);
848 fdrop(fp, td);
849 vn_lock(vp, LK_SHARED | LK_RETRY);
850 AUDIT_ARG_VNODE1(vp);
851 error = change_dir(vp, td);
852 while (!error && (mp = vp->v_mountedhere) != NULL) {
853 if (vfs_busy(mp, 0))
854 continue;
855 error = VFS_ROOT(mp, LK_SHARED, &tdp);
856 vfs_unbusy(mp);
857 if (error != 0)
858 break;
859 vput(vp);
860 vp = tdp;
861 }
862 if (error != 0) {
863 vput(vp);
864 return (error);
865 }
866 VOP_UNLOCK(vp, 0);
867 pwd_chdir(td, vp);
868 return (0);
869 }
870
871 /*
872 * Change current working directory (``.'').
873 */
874 #ifndef _SYS_SYSPROTO_H_
875 struct chdir_args {
876 char *path;
877 };
878 #endif
879 int
sys_chdir(struct thread * td,struct chdir_args * uap)880 sys_chdir(struct thread *td, struct chdir_args *uap)
881 {
882
883 return (kern_chdir(td, uap->path, UIO_USERSPACE));
884 }
885
886 int
kern_chdir(struct thread * td,char * path,enum uio_seg pathseg)887 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
888 {
889 struct nameidata nd;
890 int error;
891
892 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
893 pathseg, path, td);
894 if ((error = namei(&nd)) != 0)
895 return (error);
896 if ((error = change_dir(nd.ni_vp, td)) != 0) {
897 vput(nd.ni_vp);
898 NDFREE(&nd, NDF_ONLY_PNBUF);
899 return (error);
900 }
901 VOP_UNLOCK(nd.ni_vp, 0);
902 NDFREE(&nd, NDF_ONLY_PNBUF);
903 pwd_chdir(td, nd.ni_vp);
904 return (0);
905 }
906
907 /*
908 * Change notion of root (``/'') directory.
909 */
910 #ifndef _SYS_SYSPROTO_H_
911 struct chroot_args {
912 char *path;
913 };
914 #endif
915 int
sys_chroot(struct thread * td,struct chroot_args * uap)916 sys_chroot(struct thread *td, struct chroot_args *uap)
917 {
918 struct nameidata nd;
919 int error;
920
921 error = priv_check(td, PRIV_VFS_CHROOT);
922 if (error != 0)
923 return (error);
924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
925 UIO_USERSPACE, uap->path, td);
926 error = namei(&nd);
927 if (error != 0)
928 goto error;
929 error = change_dir(nd.ni_vp, td);
930 if (error != 0)
931 goto e_vunlock;
932 #ifdef MAC
933 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
934 if (error != 0)
935 goto e_vunlock;
936 #endif
937 VOP_UNLOCK(nd.ni_vp, 0);
938 error = pwd_chroot(td, nd.ni_vp);
939 vrele(nd.ni_vp);
940 NDFREE(&nd, NDF_ONLY_PNBUF);
941 return (error);
942 e_vunlock:
943 vput(nd.ni_vp);
944 error:
945 NDFREE(&nd, NDF_ONLY_PNBUF);
946 return (error);
947 }
948
949 /*
950 * Common routine for chroot and chdir. Callers must provide a locked vnode
951 * instance.
952 */
953 int
change_dir(struct vnode * vp,struct thread * td)954 change_dir(struct vnode *vp, struct thread *td)
955 {
956 #ifdef MAC
957 int error;
958 #endif
959
960 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
961 if (vp->v_type != VDIR)
962 return (ENOTDIR);
963 #ifdef MAC
964 error = mac_vnode_check_chdir(td->td_ucred, vp);
965 if (error != 0)
966 return (error);
967 #endif
968 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
969 }
970
971 static __inline void
flags_to_rights(int flags,cap_rights_t * rightsp)972 flags_to_rights(int flags, cap_rights_t *rightsp)
973 {
974
975 if (flags & O_EXEC) {
976 cap_rights_set(rightsp, CAP_FEXECVE);
977 } else {
978 switch ((flags & O_ACCMODE)) {
979 case O_RDONLY:
980 cap_rights_set(rightsp, CAP_READ);
981 break;
982 case O_RDWR:
983 cap_rights_set(rightsp, CAP_READ);
984 /* FALLTHROUGH */
985 case O_WRONLY:
986 cap_rights_set(rightsp, CAP_WRITE);
987 if (!(flags & (O_APPEND | O_TRUNC)))
988 cap_rights_set(rightsp, CAP_SEEK);
989 break;
990 }
991 }
992
993 if (flags & O_CREAT)
994 cap_rights_set(rightsp, CAP_CREATE);
995
996 if (flags & O_TRUNC)
997 cap_rights_set(rightsp, CAP_FTRUNCATE);
998
999 if (flags & (O_SYNC | O_FSYNC))
1000 cap_rights_set(rightsp, CAP_FSYNC);
1001
1002 if (flags & (O_EXLOCK | O_SHLOCK))
1003 cap_rights_set(rightsp, CAP_FLOCK);
1004 }
1005
1006 /*
1007 * Check permissions, allocate an open file structure, and call the device
1008 * open routine if any.
1009 */
1010 #ifndef _SYS_SYSPROTO_H_
1011 struct open_args {
1012 char *path;
1013 int flags;
1014 int mode;
1015 };
1016 #endif
1017 int
sys_open(struct thread * td,struct open_args * uap)1018 sys_open(struct thread *td, struct open_args *uap)
1019 {
1020
1021 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1022 uap->flags, uap->mode));
1023 }
1024
1025 #ifndef _SYS_SYSPROTO_H_
1026 struct openat_args {
1027 int fd;
1028 char *path;
1029 int flag;
1030 int mode;
1031 };
1032 #endif
1033 int
sys_openat(struct thread * td,struct openat_args * uap)1034 sys_openat(struct thread *td, struct openat_args *uap)
1035 {
1036
1037 AUDIT_ARG_FD(uap->fd);
1038 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1039 uap->mode));
1040 }
1041
1042 int
kern_openat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int flags,int mode)1043 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1044 int flags, int mode)
1045 {
1046 struct proc *p = td->td_proc;
1047 struct filedesc *fdp = p->p_fd;
1048 struct file *fp;
1049 struct vnode *vp;
1050 struct nameidata nd;
1051 cap_rights_t rights;
1052 int cmode, error, indx;
1053
1054 indx = -1;
1055
1056 AUDIT_ARG_FFLAGS(flags);
1057 AUDIT_ARG_MODE(mode);
1058 cap_rights_init(&rights, CAP_LOOKUP);
1059 flags_to_rights(flags, &rights);
1060 /*
1061 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1062 * may be specified.
1063 */
1064 if (flags & O_EXEC) {
1065 if (flags & O_ACCMODE)
1066 return (EINVAL);
1067 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1068 return (EINVAL);
1069 } else {
1070 flags = FFLAGS(flags);
1071 }
1072
1073 /*
1074 * Allocate a file structure. The descriptor to reference it
1075 * is allocated and set by finstall() below.
1076 */
1077 error = falloc_noinstall(td, &fp);
1078 if (error != 0)
1079 return (error);
1080 /*
1081 * An extra reference on `fp' has been held for us by
1082 * falloc_noinstall().
1083 */
1084 /* Set the flags early so the finit in devfs can pick them up. */
1085 fp->f_flag = flags & FMASK;
1086 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
1087 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
1088 &rights, td);
1089 td->td_dupfd = -1; /* XXX check for fdopen */
1090 error = vn_open(&nd, &flags, cmode, fp);
1091 if (error != 0) {
1092 /*
1093 * If the vn_open replaced the method vector, something
1094 * wonderous happened deep below and we just pass it up
1095 * pretending we know what we do.
1096 */
1097 if (error == ENXIO && fp->f_ops != &badfileops)
1098 goto success;
1099
1100 /*
1101 * Handle special fdopen() case. bleh.
1102 *
1103 * Don't do this for relative (capability) lookups; we don't
1104 * understand exactly what would happen, and we don't think
1105 * that it ever should.
1106 */
1107 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 &&
1108 (error == ENODEV || error == ENXIO) &&
1109 td->td_dupfd >= 0) {
1110 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1111 &indx);
1112 if (error == 0)
1113 goto success;
1114 }
1115
1116 goto bad;
1117 }
1118 td->td_dupfd = 0;
1119 NDFREE(&nd, NDF_ONLY_PNBUF);
1120 vp = nd.ni_vp;
1121
1122 /*
1123 * Store the vnode, for any f_type. Typically, the vnode use
1124 * count is decremented by direct call to vn_closefile() for
1125 * files that switched type in the cdevsw fdopen() method.
1126 */
1127 fp->f_vnode = vp;
1128 /*
1129 * If the file wasn't claimed by devfs bind it to the normal
1130 * vnode operations here.
1131 */
1132 if (fp->f_ops == &badfileops) {
1133 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
1134 fp->f_seqcount = 1;
1135 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK),
1136 DTYPE_VNODE, vp, &vnops);
1137 }
1138
1139 VOP_UNLOCK(vp, 0);
1140 if (flags & O_TRUNC) {
1141 error = fo_truncate(fp, 0, td->td_ucred, td);
1142 if (error != 0)
1143 goto bad;
1144 }
1145 success:
1146 /*
1147 * If we haven't already installed the FD (for dupfdopen), do so now.
1148 */
1149 if (indx == -1) {
1150 struct filecaps *fcaps;
1151
1152 #ifdef CAPABILITIES
1153 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0)
1154 fcaps = &nd.ni_filecaps;
1155 else
1156 #endif
1157 fcaps = NULL;
1158 error = finstall(td, fp, &indx, flags, fcaps);
1159 /* On success finstall() consumes fcaps. */
1160 if (error != 0) {
1161 filecaps_free(&nd.ni_filecaps);
1162 goto bad;
1163 }
1164 } else {
1165 filecaps_free(&nd.ni_filecaps);
1166 }
1167
1168 /*
1169 * Release our private reference, leaving the one associated with
1170 * the descriptor table intact.
1171 */
1172 fdrop(fp, td);
1173 td->td_retval[0] = indx;
1174 return (0);
1175 bad:
1176 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1177 fdrop(fp, td);
1178 return (error);
1179 }
1180
1181 #ifdef COMPAT_43
1182 /*
1183 * Create a file.
1184 */
1185 #ifndef _SYS_SYSPROTO_H_
1186 struct ocreat_args {
1187 char *path;
1188 int mode;
1189 };
1190 #endif
1191 int
ocreat(struct thread * td,struct ocreat_args * uap)1192 ocreat(struct thread *td, struct ocreat_args *uap)
1193 {
1194
1195 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1196 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1197 }
1198 #endif /* COMPAT_43 */
1199
1200 /*
1201 * Create a special file.
1202 */
1203 #ifndef _SYS_SYSPROTO_H_
1204 struct mknodat_args {
1205 int fd;
1206 char *path;
1207 mode_t mode;
1208 dev_t dev;
1209 };
1210 #endif
1211 int
sys_mknodat(struct thread * td,struct mknodat_args * uap)1212 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1213 {
1214
1215 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1216 uap->dev));
1217 }
1218
1219 #if defined(COMPAT_FREEBSD11)
1220 int
freebsd11_mknod(struct thread * td,struct freebsd11_mknod_args * uap)1221 freebsd11_mknod(struct thread *td,
1222 struct freebsd11_mknod_args *uap)
1223 {
1224
1225 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1226 uap->mode, uap->dev));
1227 }
1228
1229 int
freebsd11_mknodat(struct thread * td,struct freebsd11_mknodat_args * uap)1230 freebsd11_mknodat(struct thread *td,
1231 struct freebsd11_mknodat_args *uap)
1232 {
1233
1234 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1235 uap->dev));
1236 }
1237 #endif /* COMPAT_FREEBSD11 */
1238
1239 int
kern_mknodat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int mode,dev_t dev)1240 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1241 int mode, dev_t dev)
1242 {
1243 struct vnode *vp;
1244 struct mount *mp;
1245 struct vattr vattr;
1246 struct nameidata nd;
1247 int error, whiteout = 0;
1248
1249 AUDIT_ARG_MODE(mode);
1250 AUDIT_ARG_DEV(dev);
1251 switch (mode & S_IFMT) {
1252 case S_IFCHR:
1253 case S_IFBLK:
1254 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1255 if (error == 0 && dev == VNOVAL)
1256 error = EINVAL;
1257 break;
1258 case S_IFWHT:
1259 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1260 break;
1261 case S_IFIFO:
1262 if (dev == 0)
1263 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1264 /* FALLTHROUGH */
1265 default:
1266 error = EINVAL;
1267 break;
1268 }
1269 if (error != 0)
1270 return (error);
1271 restart:
1272 bwillwrite();
1273 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1274 NOCACHE, pathseg, path, fd, &cap_mknodat_rights,
1275 td);
1276 if ((error = namei(&nd)) != 0)
1277 return (error);
1278 vp = nd.ni_vp;
1279 if (vp != NULL) {
1280 NDFREE(&nd, NDF_ONLY_PNBUF);
1281 if (vp == nd.ni_dvp)
1282 vrele(nd.ni_dvp);
1283 else
1284 vput(nd.ni_dvp);
1285 vrele(vp);
1286 return (EEXIST);
1287 } else {
1288 VATTR_NULL(&vattr);
1289 vattr.va_mode = (mode & ALLPERMS) &
1290 ~td->td_proc->p_fd->fd_cmask;
1291 vattr.va_rdev = dev;
1292 whiteout = 0;
1293
1294 switch (mode & S_IFMT) {
1295 case S_IFCHR:
1296 vattr.va_type = VCHR;
1297 break;
1298 case S_IFBLK:
1299 vattr.va_type = VBLK;
1300 break;
1301 case S_IFWHT:
1302 whiteout = 1;
1303 break;
1304 default:
1305 panic("kern_mknod: invalid mode");
1306 }
1307 }
1308 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1309 NDFREE(&nd, NDF_ONLY_PNBUF);
1310 vput(nd.ni_dvp);
1311 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1312 return (error);
1313 goto restart;
1314 }
1315 #ifdef MAC
1316 if (error == 0 && !whiteout)
1317 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1318 &nd.ni_cnd, &vattr);
1319 #endif
1320 if (error == 0) {
1321 if (whiteout)
1322 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1323 else {
1324 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1325 &nd.ni_cnd, &vattr);
1326 if (error == 0)
1327 vput(nd.ni_vp);
1328 }
1329 }
1330 NDFREE(&nd, NDF_ONLY_PNBUF);
1331 vput(nd.ni_dvp);
1332 vn_finished_write(mp);
1333 return (error);
1334 }
1335
1336 /*
1337 * Create a named pipe.
1338 */
1339 #ifndef _SYS_SYSPROTO_H_
1340 struct mkfifo_args {
1341 char *path;
1342 int mode;
1343 };
1344 #endif
1345 int
sys_mkfifo(struct thread * td,struct mkfifo_args * uap)1346 sys_mkfifo(struct thread *td, struct mkfifo_args *uap)
1347 {
1348
1349 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1350 uap->mode));
1351 }
1352
1353 #ifndef _SYS_SYSPROTO_H_
1354 struct mkfifoat_args {
1355 int fd;
1356 char *path;
1357 mode_t mode;
1358 };
1359 #endif
1360 int
sys_mkfifoat(struct thread * td,struct mkfifoat_args * uap)1361 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1362 {
1363
1364 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1365 uap->mode));
1366 }
1367
1368 int
kern_mkfifoat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int mode)1369 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1370 int mode)
1371 {
1372 struct mount *mp;
1373 struct vattr vattr;
1374 struct nameidata nd;
1375 int error;
1376
1377 AUDIT_ARG_MODE(mode);
1378 restart:
1379 bwillwrite();
1380 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1381 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights,
1382 td);
1383 if ((error = namei(&nd)) != 0)
1384 return (error);
1385 if (nd.ni_vp != NULL) {
1386 NDFREE(&nd, NDF_ONLY_PNBUF);
1387 if (nd.ni_vp == nd.ni_dvp)
1388 vrele(nd.ni_dvp);
1389 else
1390 vput(nd.ni_dvp);
1391 vrele(nd.ni_vp);
1392 return (EEXIST);
1393 }
1394 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1395 NDFREE(&nd, NDF_ONLY_PNBUF);
1396 vput(nd.ni_dvp);
1397 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1398 return (error);
1399 goto restart;
1400 }
1401 VATTR_NULL(&vattr);
1402 vattr.va_type = VFIFO;
1403 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
1404 #ifdef MAC
1405 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1406 &vattr);
1407 if (error != 0)
1408 goto out;
1409 #endif
1410 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1411 if (error == 0)
1412 vput(nd.ni_vp);
1413 #ifdef MAC
1414 out:
1415 #endif
1416 vput(nd.ni_dvp);
1417 vn_finished_write(mp);
1418 NDFREE(&nd, NDF_ONLY_PNBUF);
1419 return (error);
1420 }
1421
1422 /*
1423 * Make a hard file link.
1424 */
1425 #ifndef _SYS_SYSPROTO_H_
1426 struct link_args {
1427 char *path;
1428 char *link;
1429 };
1430 #endif
1431 int
sys_link(struct thread * td,struct link_args * uap)1432 sys_link(struct thread *td, struct link_args *uap)
1433 {
1434
1435 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
1436 UIO_USERSPACE, FOLLOW));
1437 }
1438
1439 #ifndef _SYS_SYSPROTO_H_
1440 struct linkat_args {
1441 int fd1;
1442 char *path1;
1443 int fd2;
1444 char *path2;
1445 int flag;
1446 };
1447 #endif
1448 int
sys_linkat(struct thread * td,struct linkat_args * uap)1449 sys_linkat(struct thread *td, struct linkat_args *uap)
1450 {
1451 int flag;
1452
1453 flag = uap->flag;
1454 if (flag & ~AT_SYMLINK_FOLLOW)
1455 return (EINVAL);
1456
1457 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1458 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW));
1459 }
1460
1461 int hardlink_check_uid = 0;
1462 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1463 &hardlink_check_uid, 0,
1464 "Unprivileged processes cannot create hard links to files owned by other "
1465 "users");
1466 static int hardlink_check_gid = 0;
1467 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1468 &hardlink_check_gid, 0,
1469 "Unprivileged processes cannot create hard links to files owned by other "
1470 "groups");
1471
1472 static int
can_hardlink(struct vnode * vp,struct ucred * cred)1473 can_hardlink(struct vnode *vp, struct ucred *cred)
1474 {
1475 struct vattr va;
1476 int error;
1477
1478 if (!hardlink_check_uid && !hardlink_check_gid)
1479 return (0);
1480
1481 error = VOP_GETATTR(vp, &va, cred);
1482 if (error != 0)
1483 return (error);
1484
1485 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1486 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1487 if (error != 0)
1488 return (error);
1489 }
1490
1491 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1492 error = priv_check_cred(cred, PRIV_VFS_LINK, 0);
1493 if (error != 0)
1494 return (error);
1495 }
1496
1497 return (0);
1498 }
1499
1500 int
kern_linkat(struct thread * td,int fd1,int fd2,char * path1,char * path2,enum uio_seg segflag,int follow)1501 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
1502 enum uio_seg segflag, int follow)
1503 {
1504 struct nameidata nd;
1505 int error;
1506
1507 do {
1508 bwillwrite();
1509 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag,
1510 path1, fd1, &cap_linkat_source_rights, td);
1511 if ((error = namei(&nd)) != 0)
1512 return (error);
1513 NDFREE(&nd, NDF_ONLY_PNBUF);
1514 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag);
1515 } while (error == EAGAIN);
1516 return (error);
1517 }
1518
1519 static int
kern_linkat_vp(struct thread * td,struct vnode * vp,int fd,const char * path,enum uio_seg segflag)1520 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path,
1521 enum uio_seg segflag)
1522 {
1523 struct nameidata nd;
1524 struct mount *mp;
1525 int error;
1526
1527 if (vp->v_type == VDIR) {
1528 vrele(vp);
1529 return (EPERM); /* POSIX */
1530 }
1531 NDINIT_ATRIGHTS(&nd, CREATE,
1532 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd,
1533 &cap_linkat_target_rights, td);
1534 if ((error = namei(&nd)) == 0) {
1535 if (nd.ni_vp != NULL) {
1536 NDFREE(&nd, NDF_ONLY_PNBUF);
1537 if (nd.ni_dvp == nd.ni_vp)
1538 vrele(nd.ni_dvp);
1539 else
1540 vput(nd.ni_dvp);
1541 vrele(nd.ni_vp);
1542 vrele(vp);
1543 return (EEXIST);
1544 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1545 /*
1546 * Cross-device link. No need to recheck
1547 * vp->v_type, since it cannot change, except
1548 * to VBAD.
1549 */
1550 NDFREE(&nd, NDF_ONLY_PNBUF);
1551 vput(nd.ni_dvp);
1552 vrele(vp);
1553 return (EXDEV);
1554 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
1555 error = can_hardlink(vp, td->td_ucred);
1556 #ifdef MAC
1557 if (error == 0)
1558 error = mac_vnode_check_link(td->td_ucred,
1559 nd.ni_dvp, vp, &nd.ni_cnd);
1560 #endif
1561 if (error != 0) {
1562 vput(vp);
1563 vput(nd.ni_dvp);
1564 NDFREE(&nd, NDF_ONLY_PNBUF);
1565 return (error);
1566 }
1567 error = vn_start_write(vp, &mp, V_NOWAIT);
1568 if (error != 0) {
1569 vput(vp);
1570 vput(nd.ni_dvp);
1571 NDFREE(&nd, NDF_ONLY_PNBUF);
1572 error = vn_start_write(NULL, &mp,
1573 V_XSLEEP | PCATCH);
1574 if (error != 0)
1575 return (error);
1576 return (EAGAIN);
1577 }
1578 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1579 VOP_UNLOCK(vp, 0);
1580 vput(nd.ni_dvp);
1581 vn_finished_write(mp);
1582 NDFREE(&nd, NDF_ONLY_PNBUF);
1583 } else {
1584 vput(nd.ni_dvp);
1585 NDFREE(&nd, NDF_ONLY_PNBUF);
1586 vrele(vp);
1587 return (EAGAIN);
1588 }
1589 }
1590 vrele(vp);
1591 return (error);
1592 }
1593
1594 /*
1595 * Make a symbolic link.
1596 */
1597 #ifndef _SYS_SYSPROTO_H_
1598 struct symlink_args {
1599 char *path;
1600 char *link;
1601 };
1602 #endif
1603 int
sys_symlink(struct thread * td,struct symlink_args * uap)1604 sys_symlink(struct thread *td, struct symlink_args *uap)
1605 {
1606
1607 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
1608 UIO_USERSPACE));
1609 }
1610
1611 #ifndef _SYS_SYSPROTO_H_
1612 struct symlinkat_args {
1613 char *path;
1614 int fd;
1615 char *path2;
1616 };
1617 #endif
1618 int
sys_symlinkat(struct thread * td,struct symlinkat_args * uap)1619 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1620 {
1621
1622 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1623 UIO_USERSPACE));
1624 }
1625
1626 int
kern_symlinkat(struct thread * td,char * path1,int fd,char * path2,enum uio_seg segflg)1627 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
1628 enum uio_seg segflg)
1629 {
1630 struct mount *mp;
1631 struct vattr vattr;
1632 char *syspath;
1633 struct nameidata nd;
1634 int error;
1635
1636 if (segflg == UIO_SYSSPACE) {
1637 syspath = path1;
1638 } else {
1639 syspath = uma_zalloc(namei_zone, M_WAITOK);
1640 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0)
1641 goto out;
1642 }
1643 AUDIT_ARG_TEXT(syspath);
1644 restart:
1645 bwillwrite();
1646 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1647 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights,
1648 td);
1649 if ((error = namei(&nd)) != 0)
1650 goto out;
1651 if (nd.ni_vp) {
1652 NDFREE(&nd, NDF_ONLY_PNBUF);
1653 if (nd.ni_vp == nd.ni_dvp)
1654 vrele(nd.ni_dvp);
1655 else
1656 vput(nd.ni_dvp);
1657 vrele(nd.ni_vp);
1658 error = EEXIST;
1659 goto out;
1660 }
1661 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1662 NDFREE(&nd, NDF_ONLY_PNBUF);
1663 vput(nd.ni_dvp);
1664 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1665 goto out;
1666 goto restart;
1667 }
1668 VATTR_NULL(&vattr);
1669 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
1670 #ifdef MAC
1671 vattr.va_type = VLNK;
1672 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1673 &vattr);
1674 if (error != 0)
1675 goto out2;
1676 #endif
1677 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1678 if (error == 0)
1679 vput(nd.ni_vp);
1680 #ifdef MAC
1681 out2:
1682 #endif
1683 NDFREE(&nd, NDF_ONLY_PNBUF);
1684 vput(nd.ni_dvp);
1685 vn_finished_write(mp);
1686 out:
1687 if (segflg != UIO_SYSSPACE)
1688 uma_zfree(namei_zone, syspath);
1689 return (error);
1690 }
1691
1692 /*
1693 * Delete a whiteout from the filesystem.
1694 */
1695 #ifndef _SYS_SYSPROTO_H_
1696 struct undelete_args {
1697 char *path;
1698 };
1699 #endif
1700 int
sys_undelete(struct thread * td,struct undelete_args * uap)1701 sys_undelete(struct thread *td, struct undelete_args *uap)
1702 {
1703 struct mount *mp;
1704 struct nameidata nd;
1705 int error;
1706
1707 restart:
1708 bwillwrite();
1709 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1710 UIO_USERSPACE, uap->path, td);
1711 error = namei(&nd);
1712 if (error != 0)
1713 return (error);
1714
1715 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1716 NDFREE(&nd, NDF_ONLY_PNBUF);
1717 if (nd.ni_vp == nd.ni_dvp)
1718 vrele(nd.ni_dvp);
1719 else
1720 vput(nd.ni_dvp);
1721 if (nd.ni_vp)
1722 vrele(nd.ni_vp);
1723 return (EEXIST);
1724 }
1725 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1726 NDFREE(&nd, NDF_ONLY_PNBUF);
1727 vput(nd.ni_dvp);
1728 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1729 return (error);
1730 goto restart;
1731 }
1732 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1733 NDFREE(&nd, NDF_ONLY_PNBUF);
1734 vput(nd.ni_dvp);
1735 vn_finished_write(mp);
1736 return (error);
1737 }
1738
1739 /*
1740 * Delete a name from the filesystem.
1741 */
1742 #ifndef _SYS_SYSPROTO_H_
1743 struct unlink_args {
1744 char *path;
1745 };
1746 #endif
1747 int
sys_unlink(struct thread * td,struct unlink_args * uap)1748 sys_unlink(struct thread *td, struct unlink_args *uap)
1749 {
1750
1751 return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0));
1752 }
1753
1754 #ifndef _SYS_SYSPROTO_H_
1755 struct unlinkat_args {
1756 int fd;
1757 char *path;
1758 int flag;
1759 };
1760 #endif
1761 int
sys_unlinkat(struct thread * td,struct unlinkat_args * uap)1762 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1763 {
1764 int flag = uap->flag;
1765 int fd = uap->fd;
1766 char *path = uap->path;
1767
1768 if (flag & ~AT_REMOVEDIR)
1769 return (EINVAL);
1770
1771 if (flag & AT_REMOVEDIR)
1772 return (kern_rmdirat(td, fd, path, UIO_USERSPACE));
1773 else
1774 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0));
1775 }
1776
1777 int
kern_unlinkat(struct thread * td,int fd,char * path,enum uio_seg pathseg,ino_t oldinum)1778 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1779 ino_t oldinum)
1780 {
1781 struct mount *mp;
1782 struct vnode *vp;
1783 struct nameidata nd;
1784 struct stat sb;
1785 int error;
1786
1787 restart:
1788 bwillwrite();
1789 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
1790 pathseg, path, fd, &cap_unlinkat_rights, td);
1791 if ((error = namei(&nd)) != 0)
1792 return (error == EINVAL ? EPERM : error);
1793 vp = nd.ni_vp;
1794 if (vp->v_type == VDIR && oldinum == 0) {
1795 error = EPERM; /* POSIX */
1796 } else if (oldinum != 0 &&
1797 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1798 sb.st_ino != oldinum) {
1799 error = EIDRM; /* Identifier removed */
1800 } else {
1801 /*
1802 * The root of a mounted filesystem cannot be deleted.
1803 *
1804 * XXX: can this only be a VDIR case?
1805 */
1806 if (vp->v_vflag & VV_ROOT)
1807 error = EBUSY;
1808 }
1809 if (error == 0) {
1810 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1811 NDFREE(&nd, NDF_ONLY_PNBUF);
1812 vput(nd.ni_dvp);
1813 if (vp == nd.ni_dvp)
1814 vrele(vp);
1815 else
1816 vput(vp);
1817 if ((error = vn_start_write(NULL, &mp,
1818 V_XSLEEP | PCATCH)) != 0)
1819 return (error);
1820 goto restart;
1821 }
1822 #ifdef MAC
1823 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1824 &nd.ni_cnd);
1825 if (error != 0)
1826 goto out;
1827 #endif
1828 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1829 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1830 #ifdef MAC
1831 out:
1832 #endif
1833 vn_finished_write(mp);
1834 }
1835 NDFREE(&nd, NDF_ONLY_PNBUF);
1836 vput(nd.ni_dvp);
1837 if (vp == nd.ni_dvp)
1838 vrele(vp);
1839 else
1840 vput(vp);
1841 return (error);
1842 }
1843
1844 /*
1845 * Reposition read/write file offset.
1846 */
1847 #ifndef _SYS_SYSPROTO_H_
1848 struct lseek_args {
1849 int fd;
1850 int pad;
1851 off_t offset;
1852 int whence;
1853 };
1854 #endif
1855 int
sys_lseek(struct thread * td,struct lseek_args * uap)1856 sys_lseek(struct thread *td, struct lseek_args *uap)
1857 {
1858
1859 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1860 }
1861
1862 int
kern_lseek(struct thread * td,int fd,off_t offset,int whence)1863 kern_lseek(struct thread *td, int fd, off_t offset, int whence)
1864 {
1865 struct file *fp;
1866 int error;
1867
1868 AUDIT_ARG_FD(fd);
1869 error = fget(td, fd, &cap_seek_rights, &fp);
1870 if (error != 0)
1871 return (error);
1872 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
1873 fo_seek(fp, offset, whence, td) : ESPIPE;
1874 fdrop(fp, td);
1875 return (error);
1876 }
1877
1878 #if defined(COMPAT_43)
1879 /*
1880 * Reposition read/write file offset.
1881 */
1882 #ifndef _SYS_SYSPROTO_H_
1883 struct olseek_args {
1884 int fd;
1885 long offset;
1886 int whence;
1887 };
1888 #endif
1889 int
olseek(struct thread * td,struct olseek_args * uap)1890 olseek(struct thread *td, struct olseek_args *uap)
1891 {
1892
1893 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1894 }
1895 #endif /* COMPAT_43 */
1896
1897 #if defined(COMPAT_FREEBSD6)
1898 /* Version with the 'pad' argument */
1899 int
freebsd6_lseek(struct thread * td,struct freebsd6_lseek_args * uap)1900 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap)
1901 {
1902
1903 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1904 }
1905 #endif
1906
1907 /*
1908 * Check access permissions using passed credentials.
1909 */
1910 static int
vn_access(struct vnode * vp,int user_flags,struct ucred * cred,struct thread * td)1911 vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
1912 struct thread *td)
1913 {
1914 accmode_t accmode;
1915 int error;
1916
1917 /* Flags == 0 means only check for existence. */
1918 if (user_flags == 0)
1919 return (0);
1920
1921 accmode = 0;
1922 if (user_flags & R_OK)
1923 accmode |= VREAD;
1924 if (user_flags & W_OK)
1925 accmode |= VWRITE;
1926 if (user_flags & X_OK)
1927 accmode |= VEXEC;
1928 #ifdef MAC
1929 error = mac_vnode_check_access(cred, vp, accmode);
1930 if (error != 0)
1931 return (error);
1932 #endif
1933 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
1934 error = VOP_ACCESS(vp, accmode, cred, td);
1935 return (error);
1936 }
1937
1938 /*
1939 * Check access permissions using "real" credentials.
1940 */
1941 #ifndef _SYS_SYSPROTO_H_
1942 struct access_args {
1943 char *path;
1944 int amode;
1945 };
1946 #endif
1947 int
sys_access(struct thread * td,struct access_args * uap)1948 sys_access(struct thread *td, struct access_args *uap)
1949 {
1950
1951 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1952 0, uap->amode));
1953 }
1954
1955 #ifndef _SYS_SYSPROTO_H_
1956 struct faccessat_args {
1957 int dirfd;
1958 char *path;
1959 int amode;
1960 int flag;
1961 }
1962 #endif
1963 int
sys_faccessat(struct thread * td,struct faccessat_args * uap)1964 sys_faccessat(struct thread *td, struct faccessat_args *uap)
1965 {
1966
1967 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1968 uap->amode));
1969 }
1970
1971 int
kern_accessat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int flag,int amode)1972 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
1973 int flag, int amode)
1974 {
1975 struct ucred *cred, *usecred;
1976 struct vnode *vp;
1977 struct nameidata nd;
1978 int error;
1979
1980 if (flag & ~AT_EACCESS)
1981 return (EINVAL);
1982 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
1983 return (EINVAL);
1984
1985 /*
1986 * Create and modify a temporary credential instead of one that
1987 * is potentially shared (if we need one).
1988 */
1989 cred = td->td_ucred;
1990 if ((flag & AT_EACCESS) == 0 &&
1991 ((cred->cr_uid != cred->cr_ruid ||
1992 cred->cr_rgid != cred->cr_groups[0]))) {
1993 usecred = crdup(cred);
1994 usecred->cr_uid = cred->cr_ruid;
1995 usecred->cr_groups[0] = cred->cr_rgid;
1996 td->td_ucred = usecred;
1997 } else
1998 usecred = cred;
1999 AUDIT_ARG_VALUE(amode);
2000 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
2001 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights,
2002 td);
2003 if ((error = namei(&nd)) != 0)
2004 goto out;
2005 vp = nd.ni_vp;
2006
2007 error = vn_access(vp, amode, usecred, td);
2008 NDFREE(&nd, NDF_ONLY_PNBUF);
2009 vput(vp);
2010 out:
2011 if (usecred != cred) {
2012 td->td_ucred = cred;
2013 crfree(usecred);
2014 }
2015 return (error);
2016 }
2017
2018 /*
2019 * Check access permissions using "effective" credentials.
2020 */
2021 #ifndef _SYS_SYSPROTO_H_
2022 struct eaccess_args {
2023 char *path;
2024 int amode;
2025 };
2026 #endif
2027 int
sys_eaccess(struct thread * td,struct eaccess_args * uap)2028 sys_eaccess(struct thread *td, struct eaccess_args *uap)
2029 {
2030
2031 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2032 AT_EACCESS, uap->amode));
2033 }
2034
2035 #if defined(COMPAT_43)
2036 /*
2037 * Get file status; this version follows links.
2038 */
2039 #ifndef _SYS_SYSPROTO_H_
2040 struct ostat_args {
2041 char *path;
2042 struct ostat *ub;
2043 };
2044 #endif
2045 int
ostat(struct thread * td,struct ostat_args * uap)2046 ostat(struct thread *td, struct ostat_args *uap)
2047 {
2048 struct stat sb;
2049 struct ostat osb;
2050 int error;
2051
2052 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2053 &sb, NULL);
2054 if (error != 0)
2055 return (error);
2056 cvtstat(&sb, &osb);
2057 return (copyout(&osb, uap->ub, sizeof (osb)));
2058 }
2059
2060 /*
2061 * Get file status; this version does not follow links.
2062 */
2063 #ifndef _SYS_SYSPROTO_H_
2064 struct olstat_args {
2065 char *path;
2066 struct ostat *ub;
2067 };
2068 #endif
2069 int
olstat(struct thread * td,struct olstat_args * uap)2070 olstat(struct thread *td, struct olstat_args *uap)
2071 {
2072 struct stat sb;
2073 struct ostat osb;
2074 int error;
2075
2076 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2077 UIO_USERSPACE, &sb, NULL);
2078 if (error != 0)
2079 return (error);
2080 cvtstat(&sb, &osb);
2081 return (copyout(&osb, uap->ub, sizeof (osb)));
2082 }
2083
2084 /*
2085 * Convert from an old to a new stat structure.
2086 * XXX: many values are blindly truncated.
2087 */
2088 void
cvtstat(struct stat * st,struct ostat * ost)2089 cvtstat(struct stat *st, struct ostat *ost)
2090 {
2091
2092 bzero(ost, sizeof(*ost));
2093 ost->st_dev = st->st_dev;
2094 ost->st_ino = st->st_ino;
2095 ost->st_mode = st->st_mode;
2096 ost->st_nlink = st->st_nlink;
2097 ost->st_uid = st->st_uid;
2098 ost->st_gid = st->st_gid;
2099 ost->st_rdev = st->st_rdev;
2100 ost->st_size = MIN(st->st_size, INT32_MAX);
2101 ost->st_atim = st->st_atim;
2102 ost->st_mtim = st->st_mtim;
2103 ost->st_ctim = st->st_ctim;
2104 ost->st_blksize = st->st_blksize;
2105 ost->st_blocks = st->st_blocks;
2106 ost->st_flags = st->st_flags;
2107 ost->st_gen = st->st_gen;
2108 }
2109 #endif /* COMPAT_43 */
2110
2111 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
2112 int ino64_trunc_error;
2113 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW,
2114 &ino64_trunc_error, 0,
2115 "Error on truncation of device, file or inode number, or link count");
2116
2117 int
freebsd11_cvtstat(struct stat * st,struct freebsd11_stat * ost)2118 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost)
2119 {
2120
2121 ost->st_dev = st->st_dev;
2122 if (ost->st_dev != st->st_dev) {
2123 switch (ino64_trunc_error) {
2124 default:
2125 /*
2126 * Since dev_t is almost raw, don't clamp to the
2127 * maximum for case 2, but ignore the error.
2128 */
2129 break;
2130 case 1:
2131 return (EOVERFLOW);
2132 }
2133 }
2134 ost->st_ino = st->st_ino;
2135 if (ost->st_ino != st->st_ino) {
2136 switch (ino64_trunc_error) {
2137 default:
2138 case 0:
2139 break;
2140 case 1:
2141 return (EOVERFLOW);
2142 case 2:
2143 ost->st_ino = UINT32_MAX;
2144 break;
2145 }
2146 }
2147 ost->st_mode = st->st_mode;
2148 ost->st_nlink = st->st_nlink;
2149 if (ost->st_nlink != st->st_nlink) {
2150 switch (ino64_trunc_error) {
2151 default:
2152 case 0:
2153 break;
2154 case 1:
2155 return (EOVERFLOW);
2156 case 2:
2157 ost->st_nlink = UINT16_MAX;
2158 break;
2159 }
2160 }
2161 ost->st_uid = st->st_uid;
2162 ost->st_gid = st->st_gid;
2163 ost->st_rdev = st->st_rdev;
2164 if (ost->st_rdev != st->st_rdev) {
2165 switch (ino64_trunc_error) {
2166 default:
2167 break;
2168 case 1:
2169 return (EOVERFLOW);
2170 }
2171 }
2172 ost->st_atim = st->st_atim;
2173 ost->st_mtim = st->st_mtim;
2174 ost->st_ctim = st->st_ctim;
2175 ost->st_size = st->st_size;
2176 ost->st_blocks = st->st_blocks;
2177 ost->st_blksize = st->st_blksize;
2178 ost->st_flags = st->st_flags;
2179 ost->st_gen = st->st_gen;
2180 ost->st_lspare = 0;
2181 ost->st_birthtim = st->st_birthtim;
2182 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim),
2183 sizeof(*ost) - offsetof(struct freebsd11_stat,
2184 st_birthtim) - sizeof(ost->st_birthtim));
2185 return (0);
2186 }
2187
2188 int
freebsd11_stat(struct thread * td,struct freebsd11_stat_args * uap)2189 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap)
2190 {
2191 struct stat sb;
2192 struct freebsd11_stat osb;
2193 int error;
2194
2195 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2196 &sb, NULL);
2197 if (error != 0)
2198 return (error);
2199 error = freebsd11_cvtstat(&sb, &osb);
2200 if (error == 0)
2201 error = copyout(&osb, uap->ub, sizeof(osb));
2202 return (error);
2203 }
2204
2205 int
freebsd11_lstat(struct thread * td,struct freebsd11_lstat_args * uap)2206 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap)
2207 {
2208 struct stat sb;
2209 struct freebsd11_stat osb;
2210 int error;
2211
2212 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2213 UIO_USERSPACE, &sb, NULL);
2214 if (error != 0)
2215 return (error);
2216 error = freebsd11_cvtstat(&sb, &osb);
2217 if (error == 0)
2218 error = copyout(&osb, uap->ub, sizeof(osb));
2219 return (error);
2220 }
2221
2222 int
freebsd11_fhstat(struct thread * td,struct freebsd11_fhstat_args * uap)2223 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap)
2224 {
2225 struct fhandle fh;
2226 struct stat sb;
2227 struct freebsd11_stat osb;
2228 int error;
2229
2230 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
2231 if (error != 0)
2232 return (error);
2233 error = kern_fhstat(td, fh, &sb);
2234 if (error != 0)
2235 return (error);
2236 error = freebsd11_cvtstat(&sb, &osb);
2237 if (error == 0)
2238 error = copyout(&osb, uap->sb, sizeof(osb));
2239 return (error);
2240 }
2241
2242 int
freebsd11_fstatat(struct thread * td,struct freebsd11_fstatat_args * uap)2243 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap)
2244 {
2245 struct stat sb;
2246 struct freebsd11_stat osb;
2247 int error;
2248
2249 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2250 UIO_USERSPACE, &sb, NULL);
2251 if (error != 0)
2252 return (error);
2253 error = freebsd11_cvtstat(&sb, &osb);
2254 if (error == 0)
2255 error = copyout(&osb, uap->buf, sizeof(osb));
2256 return (error);
2257 }
2258 #endif /* COMPAT_FREEBSD11 */
2259
2260 /*
2261 * Get file status
2262 */
2263 #ifndef _SYS_SYSPROTO_H_
2264 struct fstatat_args {
2265 int fd;
2266 char *path;
2267 struct stat *buf;
2268 int flag;
2269 }
2270 #endif
2271 int
sys_fstatat(struct thread * td,struct fstatat_args * uap)2272 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2273 {
2274 struct stat sb;
2275 int error;
2276
2277 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2278 UIO_USERSPACE, &sb, NULL);
2279 if (error == 0)
2280 error = copyout(&sb, uap->buf, sizeof (sb));
2281 return (error);
2282 }
2283
2284 int
kern_statat(struct thread * td,int flag,int fd,char * path,enum uio_seg pathseg,struct stat * sbp,void (* hook)(struct vnode * vp,struct stat * sbp))2285 kern_statat(struct thread *td, int flag, int fd, char *path,
2286 enum uio_seg pathseg, struct stat *sbp,
2287 void (*hook)(struct vnode *vp, struct stat *sbp))
2288 {
2289 struct nameidata nd;
2290 struct stat sb;
2291 int error;
2292
2293 if (flag & ~AT_SYMLINK_NOFOLLOW)
2294 return (EINVAL);
2295
2296 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
2297 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd,
2298 &cap_fstat_rights, td);
2299
2300 if ((error = namei(&nd)) != 0)
2301 return (error);
2302 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
2303 if (error == 0) {
2304 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode);
2305 if (S_ISREG(sb.st_mode))
2306 SDT_PROBE2(vfs, , stat, reg, path, pathseg);
2307 if (__predict_false(hook != NULL))
2308 hook(nd.ni_vp, &sb);
2309 }
2310 NDFREE(&nd, NDF_ONLY_PNBUF);
2311 vput(nd.ni_vp);
2312 if (error != 0)
2313 return (error);
2314 #ifdef __STAT_TIME_T_EXT
2315 sb.st_atim_ext = 0;
2316 sb.st_mtim_ext = 0;
2317 sb.st_ctim_ext = 0;
2318 sb.st_btim_ext = 0;
2319 #endif
2320 *sbp = sb;
2321 #ifdef KTRACE
2322 if (KTRPOINT(td, KTR_STRUCT))
2323 ktrstat(&sb);
2324 #endif
2325 return (0);
2326 }
2327
2328 #if defined(COMPAT_FREEBSD11)
2329 /*
2330 * Implementation of the NetBSD [l]stat() functions.
2331 */
2332 void
freebsd11_cvtnstat(struct stat * sb,struct nstat * nsb)2333 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb)
2334 {
2335
2336 bzero(nsb, sizeof(*nsb));
2337 nsb->st_dev = sb->st_dev;
2338 nsb->st_ino = sb->st_ino;
2339 nsb->st_mode = sb->st_mode;
2340 nsb->st_nlink = sb->st_nlink;
2341 nsb->st_uid = sb->st_uid;
2342 nsb->st_gid = sb->st_gid;
2343 nsb->st_rdev = sb->st_rdev;
2344 nsb->st_atim = sb->st_atim;
2345 nsb->st_mtim = sb->st_mtim;
2346 nsb->st_ctim = sb->st_ctim;
2347 nsb->st_size = sb->st_size;
2348 nsb->st_blocks = sb->st_blocks;
2349 nsb->st_blksize = sb->st_blksize;
2350 nsb->st_flags = sb->st_flags;
2351 nsb->st_gen = sb->st_gen;
2352 nsb->st_birthtim = sb->st_birthtim;
2353 }
2354
2355 #ifndef _SYS_SYSPROTO_H_
2356 struct freebsd11_nstat_args {
2357 char *path;
2358 struct nstat *ub;
2359 };
2360 #endif
2361 int
freebsd11_nstat(struct thread * td,struct freebsd11_nstat_args * uap)2362 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap)
2363 {
2364 struct stat sb;
2365 struct nstat nsb;
2366 int error;
2367
2368 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2369 &sb, NULL);
2370 if (error != 0)
2371 return (error);
2372 freebsd11_cvtnstat(&sb, &nsb);
2373 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2374 }
2375
2376 /*
2377 * NetBSD lstat. Get file status; this version does not follow links.
2378 */
2379 #ifndef _SYS_SYSPROTO_H_
2380 struct freebsd11_nlstat_args {
2381 char *path;
2382 struct nstat *ub;
2383 };
2384 #endif
2385 int
freebsd11_nlstat(struct thread * td,struct freebsd11_nlstat_args * uap)2386 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap)
2387 {
2388 struct stat sb;
2389 struct nstat nsb;
2390 int error;
2391
2392 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2393 UIO_USERSPACE, &sb, NULL);
2394 if (error != 0)
2395 return (error);
2396 freebsd11_cvtnstat(&sb, &nsb);
2397 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2398 }
2399 #endif /* COMPAT_FREEBSD11 */
2400
2401 /*
2402 * Get configurable pathname variables.
2403 */
2404 #ifndef _SYS_SYSPROTO_H_
2405 struct pathconf_args {
2406 char *path;
2407 int name;
2408 };
2409 #endif
2410 int
sys_pathconf(struct thread * td,struct pathconf_args * uap)2411 sys_pathconf(struct thread *td, struct pathconf_args *uap)
2412 {
2413 long value;
2414 int error;
2415
2416 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW,
2417 &value);
2418 if (error == 0)
2419 td->td_retval[0] = value;
2420 return (error);
2421 }
2422
2423 #ifndef _SYS_SYSPROTO_H_
2424 struct lpathconf_args {
2425 char *path;
2426 int name;
2427 };
2428 #endif
2429 int
sys_lpathconf(struct thread * td,struct lpathconf_args * uap)2430 sys_lpathconf(struct thread *td, struct lpathconf_args *uap)
2431 {
2432 long value;
2433 int error;
2434
2435 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2436 NOFOLLOW, &value);
2437 if (error == 0)
2438 td->td_retval[0] = value;
2439 return (error);
2440 }
2441
2442 int
kern_pathconf(struct thread * td,char * path,enum uio_seg pathseg,int name,u_long flags,long * valuep)2443 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name,
2444 u_long flags, long *valuep)
2445 {
2446 struct nameidata nd;
2447 int error;
2448
2449 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2450 pathseg, path, td);
2451 if ((error = namei(&nd)) != 0)
2452 return (error);
2453 NDFREE(&nd, NDF_ONLY_PNBUF);
2454
2455 error = VOP_PATHCONF(nd.ni_vp, name, valuep);
2456 vput(nd.ni_vp);
2457 return (error);
2458 }
2459
2460 /*
2461 * Return target name of a symbolic link.
2462 */
2463 #ifndef _SYS_SYSPROTO_H_
2464 struct readlink_args {
2465 char *path;
2466 char *buf;
2467 size_t count;
2468 };
2469 #endif
2470 int
sys_readlink(struct thread * td,struct readlink_args * uap)2471 sys_readlink(struct thread *td, struct readlink_args *uap)
2472 {
2473
2474 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2475 uap->buf, UIO_USERSPACE, uap->count));
2476 }
2477 #ifndef _SYS_SYSPROTO_H_
2478 struct readlinkat_args {
2479 int fd;
2480 char *path;
2481 char *buf;
2482 size_t bufsize;
2483 };
2484 #endif
2485 int
sys_readlinkat(struct thread * td,struct readlinkat_args * uap)2486 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2487 {
2488
2489 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2490 uap->buf, UIO_USERSPACE, uap->bufsize));
2491 }
2492
2493 int
kern_readlinkat(struct thread * td,int fd,char * path,enum uio_seg pathseg,char * buf,enum uio_seg bufseg,size_t count)2494 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2495 char *buf, enum uio_seg bufseg, size_t count)
2496 {
2497 struct vnode *vp;
2498 struct nameidata nd;
2499 int error;
2500
2501 if (count > IOSIZE_MAX)
2502 return (EINVAL);
2503
2504 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
2505 pathseg, path, fd, td);
2506
2507 if ((error = namei(&nd)) != 0)
2508 return (error);
2509 NDFREE(&nd, NDF_ONLY_PNBUF);
2510 vp = nd.ni_vp;
2511
2512 error = kern_readlink_vp(vp, buf, bufseg, count, td);
2513 vput(vp);
2514
2515 return (error);
2516 }
2517
2518 /*
2519 * Helper function to readlink from a vnode
2520 */
2521 static int
kern_readlink_vp(struct vnode * vp,char * buf,enum uio_seg bufseg,size_t count,struct thread * td)2522 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count,
2523 struct thread *td)
2524 {
2525 struct iovec aiov;
2526 struct uio auio;
2527 int error;
2528
2529 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked");
2530 #ifdef MAC
2531 error = mac_vnode_check_readlink(td->td_ucred, vp);
2532 if (error != 0)
2533 return (error);
2534 #endif
2535 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0)
2536 return (EINVAL);
2537
2538 aiov.iov_base = buf;
2539 aiov.iov_len = count;
2540 auio.uio_iov = &aiov;
2541 auio.uio_iovcnt = 1;
2542 auio.uio_offset = 0;
2543 auio.uio_rw = UIO_READ;
2544 auio.uio_segflg = bufseg;
2545 auio.uio_td = td;
2546 auio.uio_resid = count;
2547 error = VOP_READLINK(vp, &auio, td->td_ucred);
2548 td->td_retval[0] = count - auio.uio_resid;
2549 return (error);
2550 }
2551
2552 /*
2553 * Common implementation code for chflags() and fchflags().
2554 */
2555 static int
setfflags(struct thread * td,struct vnode * vp,u_long flags)2556 setfflags(struct thread *td, struct vnode *vp, u_long flags)
2557 {
2558 struct mount *mp;
2559 struct vattr vattr;
2560 int error;
2561
2562 /* We can't support the value matching VNOVAL. */
2563 if (flags == VNOVAL)
2564 return (EOPNOTSUPP);
2565
2566 /*
2567 * Prevent non-root users from setting flags on devices. When
2568 * a device is reused, users can retain ownership of the device
2569 * if they are allowed to set flags and programs assume that
2570 * chown can't fail when done as root.
2571 */
2572 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2573 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2574 if (error != 0)
2575 return (error);
2576 }
2577
2578 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2579 return (error);
2580 VATTR_NULL(&vattr);
2581 vattr.va_flags = flags;
2582 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2583 #ifdef MAC
2584 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2585 if (error == 0)
2586 #endif
2587 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2588 VOP_UNLOCK(vp, 0);
2589 vn_finished_write(mp);
2590 return (error);
2591 }
2592
2593 /*
2594 * Change flags of a file given a path name.
2595 */
2596 #ifndef _SYS_SYSPROTO_H_
2597 struct chflags_args {
2598 const char *path;
2599 u_long flags;
2600 };
2601 #endif
2602 int
sys_chflags(struct thread * td,struct chflags_args * uap)2603 sys_chflags(struct thread *td, struct chflags_args *uap)
2604 {
2605
2606 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2607 uap->flags, 0));
2608 }
2609
2610 #ifndef _SYS_SYSPROTO_H_
2611 struct chflagsat_args {
2612 int fd;
2613 const char *path;
2614 u_long flags;
2615 int atflag;
2616 }
2617 #endif
2618 int
sys_chflagsat(struct thread * td,struct chflagsat_args * uap)2619 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2620 {
2621 int fd = uap->fd;
2622 const char *path = uap->path;
2623 u_long flags = uap->flags;
2624 int atflag = uap->atflag;
2625
2626 if (atflag & ~AT_SYMLINK_NOFOLLOW)
2627 return (EINVAL);
2628
2629 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag));
2630 }
2631
2632 /*
2633 * Same as chflags() but doesn't follow symlinks.
2634 */
2635 #ifndef _SYS_SYSPROTO_H_
2636 struct lchflags_args {
2637 const char *path;
2638 u_long flags;
2639 };
2640 #endif
2641 int
sys_lchflags(struct thread * td,struct lchflags_args * uap)2642 sys_lchflags(struct thread *td, struct lchflags_args *uap)
2643 {
2644
2645 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2646 uap->flags, AT_SYMLINK_NOFOLLOW));
2647 }
2648
2649 static int
kern_chflagsat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,u_long flags,int atflag)2650 kern_chflagsat(struct thread *td, int fd, const char *path,
2651 enum uio_seg pathseg, u_long flags, int atflag)
2652 {
2653 struct nameidata nd;
2654 int error, follow;
2655
2656 AUDIT_ARG_FFLAGS(flags);
2657 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2658 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2659 &cap_fchflags_rights, td);
2660 if ((error = namei(&nd)) != 0)
2661 return (error);
2662 NDFREE(&nd, NDF_ONLY_PNBUF);
2663 error = setfflags(td, nd.ni_vp, flags);
2664 vrele(nd.ni_vp);
2665 return (error);
2666 }
2667
2668 /*
2669 * Change flags of a file given a file descriptor.
2670 */
2671 #ifndef _SYS_SYSPROTO_H_
2672 struct fchflags_args {
2673 int fd;
2674 u_long flags;
2675 };
2676 #endif
2677 int
sys_fchflags(struct thread * td,struct fchflags_args * uap)2678 sys_fchflags(struct thread *td, struct fchflags_args *uap)
2679 {
2680 struct file *fp;
2681 int error;
2682
2683 AUDIT_ARG_FD(uap->fd);
2684 AUDIT_ARG_FFLAGS(uap->flags);
2685 error = getvnode(td, uap->fd, &cap_fchflags_rights,
2686 &fp);
2687 if (error != 0)
2688 return (error);
2689 #ifdef AUDIT
2690 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2691 AUDIT_ARG_VNODE1(fp->f_vnode);
2692 VOP_UNLOCK(fp->f_vnode, 0);
2693 #endif
2694 error = setfflags(td, fp->f_vnode, uap->flags);
2695 fdrop(fp, td);
2696 return (error);
2697 }
2698
2699 /*
2700 * Common implementation code for chmod(), lchmod() and fchmod().
2701 */
2702 int
setfmode(struct thread * td,struct ucred * cred,struct vnode * vp,int mode)2703 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode)
2704 {
2705 struct mount *mp;
2706 struct vattr vattr;
2707 int error;
2708
2709 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2710 return (error);
2711 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2712 VATTR_NULL(&vattr);
2713 vattr.va_mode = mode & ALLPERMS;
2714 #ifdef MAC
2715 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2716 if (error == 0)
2717 #endif
2718 error = VOP_SETATTR(vp, &vattr, cred);
2719 VOP_UNLOCK(vp, 0);
2720 vn_finished_write(mp);
2721 return (error);
2722 }
2723
2724 /*
2725 * Change mode of a file given path name.
2726 */
2727 #ifndef _SYS_SYSPROTO_H_
2728 struct chmod_args {
2729 char *path;
2730 int mode;
2731 };
2732 #endif
2733 int
sys_chmod(struct thread * td,struct chmod_args * uap)2734 sys_chmod(struct thread *td, struct chmod_args *uap)
2735 {
2736
2737 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2738 uap->mode, 0));
2739 }
2740
2741 #ifndef _SYS_SYSPROTO_H_
2742 struct fchmodat_args {
2743 int dirfd;
2744 char *path;
2745 mode_t mode;
2746 int flag;
2747 }
2748 #endif
2749 int
sys_fchmodat(struct thread * td,struct fchmodat_args * uap)2750 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2751 {
2752 int flag = uap->flag;
2753 int fd = uap->fd;
2754 char *path = uap->path;
2755 mode_t mode = uap->mode;
2756
2757 if (flag & ~AT_SYMLINK_NOFOLLOW)
2758 return (EINVAL);
2759
2760 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
2761 }
2762
2763 /*
2764 * Change mode of a file given path name (don't follow links.)
2765 */
2766 #ifndef _SYS_SYSPROTO_H_
2767 struct lchmod_args {
2768 char *path;
2769 int mode;
2770 };
2771 #endif
2772 int
sys_lchmod(struct thread * td,struct lchmod_args * uap)2773 sys_lchmod(struct thread *td, struct lchmod_args *uap)
2774 {
2775
2776 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2777 uap->mode, AT_SYMLINK_NOFOLLOW));
2778 }
2779
2780 int
kern_fchmodat(struct thread * td,int fd,char * path,enum uio_seg pathseg,mode_t mode,int flag)2781 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2782 mode_t mode, int flag)
2783 {
2784 struct nameidata nd;
2785 int error, follow;
2786
2787 AUDIT_ARG_MODE(mode);
2788 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2789 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2790 &cap_fchmod_rights, td);
2791 if ((error = namei(&nd)) != 0)
2792 return (error);
2793 NDFREE(&nd, NDF_ONLY_PNBUF);
2794 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2795 vrele(nd.ni_vp);
2796 return (error);
2797 }
2798
2799 /*
2800 * Change mode of a file given a file descriptor.
2801 */
2802 #ifndef _SYS_SYSPROTO_H_
2803 struct fchmod_args {
2804 int fd;
2805 int mode;
2806 };
2807 #endif
2808 int
sys_fchmod(struct thread * td,struct fchmod_args * uap)2809 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2810 {
2811 struct file *fp;
2812 int error;
2813
2814 AUDIT_ARG_FD(uap->fd);
2815 AUDIT_ARG_MODE(uap->mode);
2816
2817 error = fget(td, uap->fd, &cap_fchmod_rights, &fp);
2818 if (error != 0)
2819 return (error);
2820 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2821 fdrop(fp, td);
2822 return (error);
2823 }
2824
2825 /*
2826 * Common implementation for chown(), lchown(), and fchown()
2827 */
2828 int
setfown(struct thread * td,struct ucred * cred,struct vnode * vp,uid_t uid,gid_t gid)2829 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
2830 gid_t gid)
2831 {
2832 struct mount *mp;
2833 struct vattr vattr;
2834 int error;
2835
2836 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2837 return (error);
2838 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2839 VATTR_NULL(&vattr);
2840 vattr.va_uid = uid;
2841 vattr.va_gid = gid;
2842 #ifdef MAC
2843 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
2844 vattr.va_gid);
2845 if (error == 0)
2846 #endif
2847 error = VOP_SETATTR(vp, &vattr, cred);
2848 VOP_UNLOCK(vp, 0);
2849 vn_finished_write(mp);
2850 return (error);
2851 }
2852
2853 /*
2854 * Set ownership given a path name.
2855 */
2856 #ifndef _SYS_SYSPROTO_H_
2857 struct chown_args {
2858 char *path;
2859 int uid;
2860 int gid;
2861 };
2862 #endif
2863 int
sys_chown(struct thread * td,struct chown_args * uap)2864 sys_chown(struct thread *td, struct chown_args *uap)
2865 {
2866
2867 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid,
2868 uap->gid, 0));
2869 }
2870
2871 #ifndef _SYS_SYSPROTO_H_
2872 struct fchownat_args {
2873 int fd;
2874 const char * path;
2875 uid_t uid;
2876 gid_t gid;
2877 int flag;
2878 };
2879 #endif
2880 int
sys_fchownat(struct thread * td,struct fchownat_args * uap)2881 sys_fchownat(struct thread *td, struct fchownat_args *uap)
2882 {
2883 int flag;
2884
2885 flag = uap->flag;
2886 if (flag & ~AT_SYMLINK_NOFOLLOW)
2887 return (EINVAL);
2888
2889 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
2890 uap->gid, uap->flag));
2891 }
2892
2893 int
kern_fchownat(struct thread * td,int fd,char * path,enum uio_seg pathseg,int uid,int gid,int flag)2894 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
2895 int uid, int gid, int flag)
2896 {
2897 struct nameidata nd;
2898 int error, follow;
2899
2900 AUDIT_ARG_OWNER(uid, gid);
2901 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
2902 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
2903 &cap_fchown_rights, td);
2904
2905 if ((error = namei(&nd)) != 0)
2906 return (error);
2907 NDFREE(&nd, NDF_ONLY_PNBUF);
2908 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
2909 vrele(nd.ni_vp);
2910 return (error);
2911 }
2912
2913 /*
2914 * Set ownership given a path name, do not cross symlinks.
2915 */
2916 #ifndef _SYS_SYSPROTO_H_
2917 struct lchown_args {
2918 char *path;
2919 int uid;
2920 int gid;
2921 };
2922 #endif
2923 int
sys_lchown(struct thread * td,struct lchown_args * uap)2924 sys_lchown(struct thread *td, struct lchown_args *uap)
2925 {
2926
2927 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2928 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
2929 }
2930
2931 /*
2932 * Set ownership given a file descriptor.
2933 */
2934 #ifndef _SYS_SYSPROTO_H_
2935 struct fchown_args {
2936 int fd;
2937 int uid;
2938 int gid;
2939 };
2940 #endif
2941 int
sys_fchown(struct thread * td,struct fchown_args * uap)2942 sys_fchown(struct thread *td, struct fchown_args *uap)
2943 {
2944 struct file *fp;
2945 int error;
2946
2947 AUDIT_ARG_FD(uap->fd);
2948 AUDIT_ARG_OWNER(uap->uid, uap->gid);
2949 error = fget(td, uap->fd, &cap_fchown_rights, &fp);
2950 if (error != 0)
2951 return (error);
2952 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
2953 fdrop(fp, td);
2954 return (error);
2955 }
2956
2957 /*
2958 * Common implementation code for utimes(), lutimes(), and futimes().
2959 */
2960 static int
getutimes(const struct timeval * usrtvp,enum uio_seg tvpseg,struct timespec * tsp)2961 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg,
2962 struct timespec *tsp)
2963 {
2964 struct timeval tv[2];
2965 const struct timeval *tvp;
2966 int error;
2967
2968 if (usrtvp == NULL) {
2969 vfs_timestamp(&tsp[0]);
2970 tsp[1] = tsp[0];
2971 } else {
2972 if (tvpseg == UIO_SYSSPACE) {
2973 tvp = usrtvp;
2974 } else {
2975 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
2976 return (error);
2977 tvp = tv;
2978 }
2979
2980 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
2981 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
2982 return (EINVAL);
2983 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
2984 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
2985 }
2986 return (0);
2987 }
2988
2989 /*
2990 * Common implementation code for futimens(), utimensat().
2991 */
2992 #define UTIMENS_NULL 0x1
2993 #define UTIMENS_EXIT 0x2
2994 static int
getutimens(const struct timespec * usrtsp,enum uio_seg tspseg,struct timespec * tsp,int * retflags)2995 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
2996 struct timespec *tsp, int *retflags)
2997 {
2998 struct timespec tsnow;
2999 int error;
3000
3001 vfs_timestamp(&tsnow);
3002 *retflags = 0;
3003 if (usrtsp == NULL) {
3004 tsp[0] = tsnow;
3005 tsp[1] = tsnow;
3006 *retflags |= UTIMENS_NULL;
3007 return (0);
3008 }
3009 if (tspseg == UIO_SYSSPACE) {
3010 tsp[0] = usrtsp[0];
3011 tsp[1] = usrtsp[1];
3012 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
3013 return (error);
3014 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
3015 *retflags |= UTIMENS_EXIT;
3016 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
3017 *retflags |= UTIMENS_NULL;
3018 if (tsp[0].tv_nsec == UTIME_OMIT)
3019 tsp[0].tv_sec = VNOVAL;
3020 else if (tsp[0].tv_nsec == UTIME_NOW)
3021 tsp[0] = tsnow;
3022 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
3023 return (EINVAL);
3024 if (tsp[1].tv_nsec == UTIME_OMIT)
3025 tsp[1].tv_sec = VNOVAL;
3026 else if (tsp[1].tv_nsec == UTIME_NOW)
3027 tsp[1] = tsnow;
3028 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
3029 return (EINVAL);
3030
3031 return (0);
3032 }
3033
3034 /*
3035 * Common implementation code for utimes(), lutimes(), futimes(), futimens(),
3036 * and utimensat().
3037 */
3038 static int
setutimes(struct thread * td,struct vnode * vp,const struct timespec * ts,int numtimes,int nullflag)3039 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts,
3040 int numtimes, int nullflag)
3041 {
3042 struct mount *mp;
3043 struct vattr vattr;
3044 int error, setbirthtime;
3045
3046 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3047 return (error);
3048 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3049 setbirthtime = 0;
3050 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3051 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3052 setbirthtime = 1;
3053 VATTR_NULL(&vattr);
3054 vattr.va_atime = ts[0];
3055 vattr.va_mtime = ts[1];
3056 if (setbirthtime)
3057 vattr.va_birthtime = ts[1];
3058 if (numtimes > 2)
3059 vattr.va_birthtime = ts[2];
3060 if (nullflag)
3061 vattr.va_vaflags |= VA_UTIMES_NULL;
3062 #ifdef MAC
3063 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3064 vattr.va_mtime);
3065 #endif
3066 if (error == 0)
3067 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3068 VOP_UNLOCK(vp, 0);
3069 vn_finished_write(mp);
3070 return (error);
3071 }
3072
3073 /*
3074 * Set the access and modification times of a file.
3075 */
3076 #ifndef _SYS_SYSPROTO_H_
3077 struct utimes_args {
3078 char *path;
3079 struct timeval *tptr;
3080 };
3081 #endif
3082 int
sys_utimes(struct thread * td,struct utimes_args * uap)3083 sys_utimes(struct thread *td, struct utimes_args *uap)
3084 {
3085
3086 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3087 uap->tptr, UIO_USERSPACE));
3088 }
3089
3090 #ifndef _SYS_SYSPROTO_H_
3091 struct futimesat_args {
3092 int fd;
3093 const char * path;
3094 const struct timeval * times;
3095 };
3096 #endif
3097 int
sys_futimesat(struct thread * td,struct futimesat_args * uap)3098 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3099 {
3100
3101 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3102 uap->times, UIO_USERSPACE));
3103 }
3104
3105 int
kern_utimesat(struct thread * td,int fd,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3106 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3107 struct timeval *tptr, enum uio_seg tptrseg)
3108 {
3109 struct nameidata nd;
3110 struct timespec ts[2];
3111 int error;
3112
3113 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3114 return (error);
3115 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3116 &cap_futimes_rights, td);
3117
3118 if ((error = namei(&nd)) != 0)
3119 return (error);
3120 NDFREE(&nd, NDF_ONLY_PNBUF);
3121 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3122 vrele(nd.ni_vp);
3123 return (error);
3124 }
3125
3126 /*
3127 * Set the access and modification times of a file.
3128 */
3129 #ifndef _SYS_SYSPROTO_H_
3130 struct lutimes_args {
3131 char *path;
3132 struct timeval *tptr;
3133 };
3134 #endif
3135 int
sys_lutimes(struct thread * td,struct lutimes_args * uap)3136 sys_lutimes(struct thread *td, struct lutimes_args *uap)
3137 {
3138
3139 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3140 UIO_USERSPACE));
3141 }
3142
3143 int
kern_lutimes(struct thread * td,char * path,enum uio_seg pathseg,struct timeval * tptr,enum uio_seg tptrseg)3144 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
3145 struct timeval *tptr, enum uio_seg tptrseg)
3146 {
3147 struct timespec ts[2];
3148 struct nameidata nd;
3149 int error;
3150
3151 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3152 return (error);
3153 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
3154 if ((error = namei(&nd)) != 0)
3155 return (error);
3156 NDFREE(&nd, NDF_ONLY_PNBUF);
3157 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3158 vrele(nd.ni_vp);
3159 return (error);
3160 }
3161
3162 /*
3163 * Set the access and modification times of a file.
3164 */
3165 #ifndef _SYS_SYSPROTO_H_
3166 struct futimes_args {
3167 int fd;
3168 struct timeval *tptr;
3169 };
3170 #endif
3171 int
sys_futimes(struct thread * td,struct futimes_args * uap)3172 sys_futimes(struct thread *td, struct futimes_args *uap)
3173 {
3174
3175 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3176 }
3177
3178 int
kern_futimes(struct thread * td,int fd,struct timeval * tptr,enum uio_seg tptrseg)3179 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3180 enum uio_seg tptrseg)
3181 {
3182 struct timespec ts[2];
3183 struct file *fp;
3184 int error;
3185
3186 AUDIT_ARG_FD(fd);
3187 error = getutimes(tptr, tptrseg, ts);
3188 if (error != 0)
3189 return (error);
3190 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3191 if (error != 0)
3192 return (error);
3193 #ifdef AUDIT
3194 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3195 AUDIT_ARG_VNODE1(fp->f_vnode);
3196 VOP_UNLOCK(fp->f_vnode, 0);
3197 #endif
3198 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3199 fdrop(fp, td);
3200 return (error);
3201 }
3202
3203 int
sys_futimens(struct thread * td,struct futimens_args * uap)3204 sys_futimens(struct thread *td, struct futimens_args *uap)
3205 {
3206
3207 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
3208 }
3209
3210 int
kern_futimens(struct thread * td,int fd,struct timespec * tptr,enum uio_seg tptrseg)3211 kern_futimens(struct thread *td, int fd, struct timespec *tptr,
3212 enum uio_seg tptrseg)
3213 {
3214 struct timespec ts[2];
3215 struct file *fp;
3216 int error, flags;
3217
3218 AUDIT_ARG_FD(fd);
3219 error = getutimens(tptr, tptrseg, ts, &flags);
3220 if (error != 0)
3221 return (error);
3222 if (flags & UTIMENS_EXIT)
3223 return (0);
3224 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3225 if (error != 0)
3226 return (error);
3227 #ifdef AUDIT
3228 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3229 AUDIT_ARG_VNODE1(fp->f_vnode);
3230 VOP_UNLOCK(fp->f_vnode, 0);
3231 #endif
3232 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
3233 fdrop(fp, td);
3234 return (error);
3235 }
3236
3237 int
sys_utimensat(struct thread * td,struct utimensat_args * uap)3238 sys_utimensat(struct thread *td, struct utimensat_args *uap)
3239 {
3240
3241 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
3242 uap->times, UIO_USERSPACE, uap->flag));
3243 }
3244
3245 int
kern_utimensat(struct thread * td,int fd,char * path,enum uio_seg pathseg,struct timespec * tptr,enum uio_seg tptrseg,int flag)3246 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
3247 struct timespec *tptr, enum uio_seg tptrseg, int flag)
3248 {
3249 struct nameidata nd;
3250 struct timespec ts[2];
3251 int error, flags;
3252
3253 if (flag & ~AT_SYMLINK_NOFOLLOW)
3254 return (EINVAL);
3255
3256 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
3257 return (error);
3258 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
3259 FOLLOW) | AUDITVNODE1, pathseg, path, fd,
3260 &cap_futimes_rights, td);
3261 if ((error = namei(&nd)) != 0)
3262 return (error);
3263 /*
3264 * We are allowed to call namei() regardless of 2xUTIME_OMIT.
3265 * POSIX states:
3266 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
3267 * "Search permission is denied by a component of the path prefix."
3268 */
3269 NDFREE(&nd, NDF_ONLY_PNBUF);
3270 if ((flags & UTIMENS_EXIT) == 0)
3271 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
3272 vrele(nd.ni_vp);
3273 return (error);
3274 }
3275
3276 /*
3277 * Truncate a file given its path name.
3278 */
3279 #ifndef _SYS_SYSPROTO_H_
3280 struct truncate_args {
3281 char *path;
3282 int pad;
3283 off_t length;
3284 };
3285 #endif
3286 int
sys_truncate(struct thread * td,struct truncate_args * uap)3287 sys_truncate(struct thread *td, struct truncate_args *uap)
3288 {
3289
3290 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3291 }
3292
3293 int
kern_truncate(struct thread * td,char * path,enum uio_seg pathseg,off_t length)3294 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
3295 {
3296 struct mount *mp;
3297 struct vnode *vp;
3298 void *rl_cookie;
3299 struct vattr vattr;
3300 struct nameidata nd;
3301 int error;
3302
3303 if (length < 0)
3304 return(EINVAL);
3305 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
3306 if ((error = namei(&nd)) != 0)
3307 return (error);
3308 vp = nd.ni_vp;
3309 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3310 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3311 vn_rangelock_unlock(vp, rl_cookie);
3312 vrele(vp);
3313 return (error);
3314 }
3315 NDFREE(&nd, NDF_ONLY_PNBUF);
3316 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3317 if (vp->v_type == VDIR)
3318 error = EISDIR;
3319 #ifdef MAC
3320 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3321 }
3322 #endif
3323 else if ((error = vn_writechk(vp)) == 0 &&
3324 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3325 VATTR_NULL(&vattr);
3326 vattr.va_size = length;
3327 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3328 }
3329 VOP_UNLOCK(vp, 0);
3330 vn_finished_write(mp);
3331 vn_rangelock_unlock(vp, rl_cookie);
3332 vrele(vp);
3333 return (error);
3334 }
3335
3336 #if defined(COMPAT_43)
3337 /*
3338 * Truncate a file given its path name.
3339 */
3340 #ifndef _SYS_SYSPROTO_H_
3341 struct otruncate_args {
3342 char *path;
3343 long length;
3344 };
3345 #endif
3346 int
otruncate(struct thread * td,struct otruncate_args * uap)3347 otruncate(struct thread *td, struct otruncate_args *uap)
3348 {
3349
3350 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3351 }
3352 #endif /* COMPAT_43 */
3353
3354 #if defined(COMPAT_FREEBSD6)
3355 /* Versions with the pad argument */
3356 int
freebsd6_truncate(struct thread * td,struct freebsd6_truncate_args * uap)3357 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3358 {
3359
3360 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3361 }
3362
3363 int
freebsd6_ftruncate(struct thread * td,struct freebsd6_ftruncate_args * uap)3364 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3365 {
3366
3367 return (kern_ftruncate(td, uap->fd, uap->length));
3368 }
3369 #endif
3370
3371 int
kern_fsync(struct thread * td,int fd,bool fullsync)3372 kern_fsync(struct thread *td, int fd, bool fullsync)
3373 {
3374 struct vnode *vp;
3375 struct mount *mp;
3376 struct file *fp;
3377 int error, lock_flags;
3378
3379 AUDIT_ARG_FD(fd);
3380 error = getvnode(td, fd, &cap_fsync_rights, &fp);
3381 if (error != 0)
3382 return (error);
3383 vp = fp->f_vnode;
3384 #if 0
3385 if (!fullsync)
3386 /* XXXKIB: compete outstanding aio writes */;
3387 #endif
3388 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3389 if (error != 0)
3390 goto drop;
3391 if (MNT_SHARED_WRITES(mp) ||
3392 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3393 lock_flags = LK_SHARED;
3394 } else {
3395 lock_flags = LK_EXCLUSIVE;
3396 }
3397 vn_lock(vp, lock_flags | LK_RETRY);
3398 AUDIT_ARG_VNODE1(vp);
3399 if (vp->v_object != NULL) {
3400 VM_OBJECT_WLOCK(vp->v_object);
3401 vm_object_page_clean(vp->v_object, 0, 0, 0);
3402 VM_OBJECT_WUNLOCK(vp->v_object);
3403 }
3404 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td);
3405 VOP_UNLOCK(vp, 0);
3406 vn_finished_write(mp);
3407 drop:
3408 fdrop(fp, td);
3409 return (error);
3410 }
3411
3412 /*
3413 * Sync an open file.
3414 */
3415 #ifndef _SYS_SYSPROTO_H_
3416 struct fsync_args {
3417 int fd;
3418 };
3419 #endif
3420 int
sys_fsync(struct thread * td,struct fsync_args * uap)3421 sys_fsync(struct thread *td, struct fsync_args *uap)
3422 {
3423
3424 return (kern_fsync(td, uap->fd, true));
3425 }
3426
3427 int
sys_fdatasync(struct thread * td,struct fdatasync_args * uap)3428 sys_fdatasync(struct thread *td, struct fdatasync_args *uap)
3429 {
3430
3431 return (kern_fsync(td, uap->fd, false));
3432 }
3433
3434 /*
3435 * Rename files. Source and destination must either both be directories, or
3436 * both not be directories. If target is a directory, it must be empty.
3437 */
3438 #ifndef _SYS_SYSPROTO_H_
3439 struct rename_args {
3440 char *from;
3441 char *to;
3442 };
3443 #endif
3444 int
sys_rename(struct thread * td,struct rename_args * uap)3445 sys_rename(struct thread *td, struct rename_args *uap)
3446 {
3447
3448 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
3449 uap->to, UIO_USERSPACE));
3450 }
3451
3452 #ifndef _SYS_SYSPROTO_H_
3453 struct renameat_args {
3454 int oldfd;
3455 char *old;
3456 int newfd;
3457 char *new;
3458 };
3459 #endif
3460 int
sys_renameat(struct thread * td,struct renameat_args * uap)3461 sys_renameat(struct thread *td, struct renameat_args *uap)
3462 {
3463
3464 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3465 UIO_USERSPACE));
3466 }
3467
3468 int
kern_renameat(struct thread * td,int oldfd,char * old,int newfd,char * new,enum uio_seg pathseg)3469 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
3470 enum uio_seg pathseg)
3471 {
3472 struct mount *mp = NULL;
3473 struct vnode *tvp, *fvp, *tdvp;
3474 struct nameidata fromnd, tond;
3475 int error;
3476
3477 again:
3478 bwillwrite();
3479 #ifdef MAC
3480 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3481 AUDITVNODE1, pathseg, old, oldfd,
3482 &cap_renameat_source_rights, td);
3483 #else
3484 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
3485 pathseg, old, oldfd,
3486 &cap_renameat_source_rights, td);
3487 #endif
3488
3489 if ((error = namei(&fromnd)) != 0)
3490 return (error);
3491 #ifdef MAC
3492 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
3493 fromnd.ni_vp, &fromnd.ni_cnd);
3494 VOP_UNLOCK(fromnd.ni_dvp, 0);
3495 if (fromnd.ni_dvp != fromnd.ni_vp)
3496 VOP_UNLOCK(fromnd.ni_vp, 0);
3497 #endif
3498 fvp = fromnd.ni_vp;
3499 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
3500 SAVESTART | AUDITVNODE2, pathseg, new, newfd,
3501 &cap_renameat_target_rights, td);
3502 if (fromnd.ni_vp->v_type == VDIR)
3503 tond.ni_cnd.cn_flags |= WILLBEDIR;
3504 if ((error = namei(&tond)) != 0) {
3505 /* Translate error code for rename("dir1", "dir2/."). */
3506 if (error == EISDIR && fvp->v_type == VDIR)
3507 error = EINVAL;
3508 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3509 vrele(fromnd.ni_dvp);
3510 vrele(fvp);
3511 goto out1;
3512 }
3513 tdvp = tond.ni_dvp;
3514 tvp = tond.ni_vp;
3515 error = vn_start_write(fvp, &mp, V_NOWAIT);
3516 if (error != 0) {
3517 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3518 NDFREE(&tond, NDF_ONLY_PNBUF);
3519 if (tvp != NULL)
3520 vput(tvp);
3521 if (tdvp == tvp)
3522 vrele(tdvp);
3523 else
3524 vput(tdvp);
3525 vrele(fromnd.ni_dvp);
3526 vrele(fvp);
3527 vrele(tond.ni_startdir);
3528 if (fromnd.ni_startdir != NULL)
3529 vrele(fromnd.ni_startdir);
3530 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
3531 if (error != 0)
3532 return (error);
3533 goto again;
3534 }
3535 if (tvp != NULL) {
3536 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3537 error = ENOTDIR;
3538 goto out;
3539 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3540 error = EISDIR;
3541 goto out;
3542 }
3543 #ifdef CAPABILITIES
3544 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) {
3545 /*
3546 * If the target already exists we require CAP_UNLINKAT
3547 * from 'newfd', when newfd was used for the lookup.
3548 */
3549 error = cap_check(&tond.ni_filecaps.fc_rights,
3550 &cap_unlinkat_rights);
3551 if (error != 0)
3552 goto out;
3553 }
3554 #endif
3555 }
3556 if (fvp == tdvp) {
3557 error = EINVAL;
3558 goto out;
3559 }
3560 /*
3561 * If the source is the same as the destination (that is, if they
3562 * are links to the same vnode), then there is nothing to do.
3563 */
3564 if (fvp == tvp)
3565 error = -1;
3566 #ifdef MAC
3567 else
3568 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3569 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3570 #endif
3571 out:
3572 if (error == 0) {
3573 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3574 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3575 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3576 NDFREE(&tond, NDF_ONLY_PNBUF);
3577 } else {
3578 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3579 NDFREE(&tond, NDF_ONLY_PNBUF);
3580 if (tvp != NULL)
3581 vput(tvp);
3582 if (tdvp == tvp)
3583 vrele(tdvp);
3584 else
3585 vput(tdvp);
3586 vrele(fromnd.ni_dvp);
3587 vrele(fvp);
3588 }
3589 vrele(tond.ni_startdir);
3590 vn_finished_write(mp);
3591 out1:
3592 if (fromnd.ni_startdir)
3593 vrele(fromnd.ni_startdir);
3594 if (error == -1)
3595 return (0);
3596 return (error);
3597 }
3598
3599 /*
3600 * Make a directory file.
3601 */
3602 #ifndef _SYS_SYSPROTO_H_
3603 struct mkdir_args {
3604 char *path;
3605 int mode;
3606 };
3607 #endif
3608 int
sys_mkdir(struct thread * td,struct mkdir_args * uap)3609 sys_mkdir(struct thread *td, struct mkdir_args *uap)
3610 {
3611
3612 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3613 uap->mode));
3614 }
3615
3616 #ifndef _SYS_SYSPROTO_H_
3617 struct mkdirat_args {
3618 int fd;
3619 char *path;
3620 mode_t mode;
3621 };
3622 #endif
3623 int
sys_mkdirat(struct thread * td,struct mkdirat_args * uap)3624 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3625 {
3626
3627 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3628 }
3629
3630 int
kern_mkdirat(struct thread * td,int fd,char * path,enum uio_seg segflg,int mode)3631 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
3632 int mode)
3633 {
3634 struct mount *mp;
3635 struct vnode *vp;
3636 struct vattr vattr;
3637 struct nameidata nd;
3638 int error;
3639
3640 AUDIT_ARG_MODE(mode);
3641 restart:
3642 bwillwrite();
3643 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
3644 NOCACHE, segflg, path, fd, &cap_mkdirat_rights,
3645 td);
3646 nd.ni_cnd.cn_flags |= WILLBEDIR;
3647 if ((error = namei(&nd)) != 0)
3648 return (error);
3649 vp = nd.ni_vp;
3650 if (vp != NULL) {
3651 NDFREE(&nd, NDF_ONLY_PNBUF);
3652 /*
3653 * XXX namei called with LOCKPARENT but not LOCKLEAF has
3654 * the strange behaviour of leaving the vnode unlocked
3655 * if the target is the same vnode as the parent.
3656 */
3657 if (vp == nd.ni_dvp)
3658 vrele(nd.ni_dvp);
3659 else
3660 vput(nd.ni_dvp);
3661 vrele(vp);
3662 return (EEXIST);
3663 }
3664 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3665 NDFREE(&nd, NDF_ONLY_PNBUF);
3666 vput(nd.ni_dvp);
3667 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3668 return (error);
3669 goto restart;
3670 }
3671 VATTR_NULL(&vattr);
3672 vattr.va_type = VDIR;
3673 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
3674 #ifdef MAC
3675 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3676 &vattr);
3677 if (error != 0)
3678 goto out;
3679 #endif
3680 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3681 #ifdef MAC
3682 out:
3683 #endif
3684 NDFREE(&nd, NDF_ONLY_PNBUF);
3685 vput(nd.ni_dvp);
3686 if (error == 0)
3687 vput(nd.ni_vp);
3688 vn_finished_write(mp);
3689 return (error);
3690 }
3691
3692 /*
3693 * Remove a directory file.
3694 */
3695 #ifndef _SYS_SYSPROTO_H_
3696 struct rmdir_args {
3697 char *path;
3698 };
3699 #endif
3700 int
sys_rmdir(struct thread * td,struct rmdir_args * uap)3701 sys_rmdir(struct thread *td, struct rmdir_args *uap)
3702 {
3703
3704 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE));
3705 }
3706
3707 int
kern_rmdirat(struct thread * td,int fd,char * path,enum uio_seg pathseg)3708 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg)
3709 {
3710 struct mount *mp;
3711 struct vnode *vp;
3712 struct nameidata nd;
3713 int error;
3714
3715 restart:
3716 bwillwrite();
3717 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1,
3718 pathseg, path, fd, &cap_unlinkat_rights, td);
3719 if ((error = namei(&nd)) != 0)
3720 return (error);
3721 vp = nd.ni_vp;
3722 if (vp->v_type != VDIR) {
3723 error = ENOTDIR;
3724 goto out;
3725 }
3726 /*
3727 * No rmdir "." please.
3728 */
3729 if (nd.ni_dvp == vp) {
3730 error = EINVAL;
3731 goto out;
3732 }
3733 /*
3734 * The root of a mounted filesystem cannot be deleted.
3735 */
3736 if (vp->v_vflag & VV_ROOT) {
3737 error = EBUSY;
3738 goto out;
3739 }
3740 #ifdef MAC
3741 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3742 &nd.ni_cnd);
3743 if (error != 0)
3744 goto out;
3745 #endif
3746 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3747 NDFREE(&nd, NDF_ONLY_PNBUF);
3748 vput(vp);
3749 if (nd.ni_dvp == vp)
3750 vrele(nd.ni_dvp);
3751 else
3752 vput(nd.ni_dvp);
3753 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3754 return (error);
3755 goto restart;
3756 }
3757 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3758 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3759 vn_finished_write(mp);
3760 out:
3761 NDFREE(&nd, NDF_ONLY_PNBUF);
3762 vput(vp);
3763 if (nd.ni_dvp == vp)
3764 vrele(nd.ni_dvp);
3765 else
3766 vput(nd.ni_dvp);
3767 return (error);
3768 }
3769
3770 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
3771 int
freebsd11_kern_getdirentries(struct thread * td,int fd,char * ubuf,u_int count,long * basep,void (* func)(struct freebsd11_dirent *))3772 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count,
3773 long *basep, void (*func)(struct freebsd11_dirent *))
3774 {
3775 struct freebsd11_dirent dstdp;
3776 struct dirent *dp, *edp;
3777 char *dirbuf;
3778 off_t base;
3779 ssize_t resid, ucount;
3780 int error;
3781
3782 /* XXX arbitrary sanity limit on `count'. */
3783 count = min(count, 64 * 1024);
3784
3785 dirbuf = malloc(count, M_TEMP, M_WAITOK);
3786
3787 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid,
3788 UIO_SYSSPACE);
3789 if (error != 0)
3790 goto done;
3791 if (basep != NULL)
3792 *basep = base;
3793
3794 ucount = 0;
3795 for (dp = (struct dirent *)dirbuf,
3796 edp = (struct dirent *)&dirbuf[count - resid];
3797 ucount < count && dp < edp; ) {
3798 if (dp->d_reclen == 0)
3799 break;
3800 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0));
3801 if (dp->d_namlen >= sizeof(dstdp.d_name))
3802 continue;
3803 dstdp.d_type = dp->d_type;
3804 dstdp.d_namlen = dp->d_namlen;
3805 dstdp.d_fileno = dp->d_fileno; /* truncate */
3806 if (dstdp.d_fileno != dp->d_fileno) {
3807 switch (ino64_trunc_error) {
3808 default:
3809 case 0:
3810 break;
3811 case 1:
3812 error = EOVERFLOW;
3813 goto done;
3814 case 2:
3815 dstdp.d_fileno = UINT32_MAX;
3816 break;
3817 }
3818 }
3819 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) +
3820 ((dp->d_namlen + 1 + 3) &~ 3);
3821 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
3822 bzero(dstdp.d_name + dstdp.d_namlen,
3823 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) -
3824 dstdp.d_namlen);
3825 MPASS(dstdp.d_reclen <= dp->d_reclen);
3826 MPASS(ucount + dstdp.d_reclen <= count);
3827 if (func != NULL)
3828 func(&dstdp);
3829 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen);
3830 if (error != 0)
3831 break;
3832 dp = (struct dirent *)((char *)dp + dp->d_reclen);
3833 ucount += dstdp.d_reclen;
3834 }
3835
3836 done:
3837 free(dirbuf, M_TEMP);
3838 if (error == 0)
3839 td->td_retval[0] = ucount;
3840 return (error);
3841 }
3842 #endif /* COMPAT */
3843
3844 #ifdef COMPAT_43
3845 static void
ogetdirentries_cvt(struct freebsd11_dirent * dp)3846 ogetdirentries_cvt(struct freebsd11_dirent *dp)
3847 {
3848 #if (BYTE_ORDER == LITTLE_ENDIAN)
3849 /*
3850 * The expected low byte of dp->d_namlen is our dp->d_type.
3851 * The high MBZ byte of dp->d_namlen is our dp->d_namlen.
3852 */
3853 dp->d_type = dp->d_namlen;
3854 dp->d_namlen = 0;
3855 #else
3856 /*
3857 * The dp->d_type is the high byte of the expected dp->d_namlen,
3858 * so must be zero'ed.
3859 */
3860 dp->d_type = 0;
3861 #endif
3862 }
3863
3864 /*
3865 * Read a block of directory entries in a filesystem independent format.
3866 */
3867 #ifndef _SYS_SYSPROTO_H_
3868 struct ogetdirentries_args {
3869 int fd;
3870 char *buf;
3871 u_int count;
3872 long *basep;
3873 };
3874 #endif
3875 int
ogetdirentries(struct thread * td,struct ogetdirentries_args * uap)3876 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
3877 {
3878 long loff;
3879 int error;
3880
3881 error = kern_ogetdirentries(td, uap, &loff);
3882 if (error == 0)
3883 error = copyout(&loff, uap->basep, sizeof(long));
3884 return (error);
3885 }
3886
3887 int
kern_ogetdirentries(struct thread * td,struct ogetdirentries_args * uap,long * ploff)3888 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
3889 long *ploff)
3890 {
3891 long base;
3892 int error;
3893
3894 /* XXX arbitrary sanity limit on `count'. */
3895 if (uap->count > 64 * 1024)
3896 return (EINVAL);
3897
3898 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
3899 &base, ogetdirentries_cvt);
3900
3901 if (error == 0 && uap->basep != NULL)
3902 error = copyout(&base, uap->basep, sizeof(long));
3903
3904 return (error);
3905 }
3906 #endif /* COMPAT_43 */
3907
3908 #if defined(COMPAT_FREEBSD11)
3909 #ifndef _SYS_SYSPROTO_H_
3910 struct freebsd11_getdirentries_args {
3911 int fd;
3912 char *buf;
3913 u_int count;
3914 long *basep;
3915 };
3916 #endif
3917 int
freebsd11_getdirentries(struct thread * td,struct freebsd11_getdirentries_args * uap)3918 freebsd11_getdirentries(struct thread *td,
3919 struct freebsd11_getdirentries_args *uap)
3920 {
3921 long base;
3922 int error;
3923
3924 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
3925 &base, NULL);
3926
3927 if (error == 0 && uap->basep != NULL)
3928 error = copyout(&base, uap->basep, sizeof(long));
3929 return (error);
3930 }
3931
3932 int
freebsd11_getdents(struct thread * td,struct freebsd11_getdents_args * uap)3933 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap)
3934 {
3935 struct freebsd11_getdirentries_args ap;
3936
3937 ap.fd = uap->fd;
3938 ap.buf = uap->buf;
3939 ap.count = uap->count;
3940 ap.basep = NULL;
3941 return (freebsd11_getdirentries(td, &ap));
3942 }
3943 #endif /* COMPAT_FREEBSD11 */
3944
3945 /*
3946 * Read a block of directory entries in a filesystem independent format.
3947 */
3948 int
sys_getdirentries(struct thread * td,struct getdirentries_args * uap)3949 sys_getdirentries(struct thread *td, struct getdirentries_args *uap)
3950 {
3951 off_t base;
3952 int error;
3953
3954 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
3955 NULL, UIO_USERSPACE);
3956 if (error != 0)
3957 return (error);
3958 if (uap->basep != NULL)
3959 error = copyout(&base, uap->basep, sizeof(off_t));
3960 return (error);
3961 }
3962
3963 int
kern_getdirentries(struct thread * td,int fd,char * buf,size_t count,off_t * basep,ssize_t * residp,enum uio_seg bufseg)3964 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count,
3965 off_t *basep, ssize_t *residp, enum uio_seg bufseg)
3966 {
3967 struct vnode *vp;
3968 struct file *fp;
3969 struct uio auio;
3970 struct iovec aiov;
3971 off_t loff;
3972 int error, eofflag;
3973 off_t foffset;
3974
3975 AUDIT_ARG_FD(fd);
3976 if (count > IOSIZE_MAX)
3977 return (EINVAL);
3978 auio.uio_resid = count;
3979 error = getvnode(td, fd, &cap_read_rights, &fp);
3980 if (error != 0)
3981 return (error);
3982 if ((fp->f_flag & FREAD) == 0) {
3983 fdrop(fp, td);
3984 return (EBADF);
3985 }
3986 vp = fp->f_vnode;
3987 foffset = foffset_lock(fp, 0);
3988 unionread:
3989 if (vp->v_type != VDIR) {
3990 error = EINVAL;
3991 goto fail;
3992 }
3993 aiov.iov_base = buf;
3994 aiov.iov_len = count;
3995 auio.uio_iov = &aiov;
3996 auio.uio_iovcnt = 1;
3997 auio.uio_rw = UIO_READ;
3998 auio.uio_segflg = bufseg;
3999 auio.uio_td = td;
4000 vn_lock(vp, LK_SHARED | LK_RETRY);
4001 AUDIT_ARG_VNODE1(vp);
4002 loff = auio.uio_offset = foffset;
4003 #ifdef MAC
4004 error = mac_vnode_check_readdir(td->td_ucred, vp);
4005 if (error == 0)
4006 #endif
4007 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4008 NULL);
4009 foffset = auio.uio_offset;
4010 if (error != 0) {
4011 VOP_UNLOCK(vp, 0);
4012 goto fail;
4013 }
4014 if (count == auio.uio_resid &&
4015 (vp->v_vflag & VV_ROOT) &&
4016 (vp->v_mount->mnt_flag & MNT_UNION)) {
4017 struct vnode *tvp = vp;
4018
4019 vp = vp->v_mount->mnt_vnodecovered;
4020 VREF(vp);
4021 fp->f_vnode = vp;
4022 fp->f_data = vp;
4023 foffset = 0;
4024 vput(tvp);
4025 goto unionread;
4026 }
4027 VOP_UNLOCK(vp, 0);
4028 *basep = loff;
4029 if (residp != NULL)
4030 *residp = auio.uio_resid;
4031 td->td_retval[0] = count - auio.uio_resid;
4032 fail:
4033 foffset_unlock(fp, foffset, 0);
4034 fdrop(fp, td);
4035 return (error);
4036 }
4037
4038 /*
4039 * Set the mode mask for creation of filesystem nodes.
4040 */
4041 #ifndef _SYS_SYSPROTO_H_
4042 struct umask_args {
4043 int newmask;
4044 };
4045 #endif
4046 int
sys_umask(struct thread * td,struct umask_args * uap)4047 sys_umask(struct thread *td, struct umask_args *uap)
4048 {
4049 struct filedesc *fdp;
4050
4051 fdp = td->td_proc->p_fd;
4052 FILEDESC_XLOCK(fdp);
4053 td->td_retval[0] = fdp->fd_cmask;
4054 fdp->fd_cmask = uap->newmask & ALLPERMS;
4055 FILEDESC_XUNLOCK(fdp);
4056 return (0);
4057 }
4058
4059 /*
4060 * Void all references to file by ripping underlying filesystem away from
4061 * vnode.
4062 */
4063 #ifndef _SYS_SYSPROTO_H_
4064 struct revoke_args {
4065 char *path;
4066 };
4067 #endif
4068 int
sys_revoke(struct thread * td,struct revoke_args * uap)4069 sys_revoke(struct thread *td, struct revoke_args *uap)
4070 {
4071 struct vnode *vp;
4072 struct vattr vattr;
4073 struct nameidata nd;
4074 int error;
4075
4076 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4077 uap->path, td);
4078 if ((error = namei(&nd)) != 0)
4079 return (error);
4080 vp = nd.ni_vp;
4081 NDFREE(&nd, NDF_ONLY_PNBUF);
4082 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4083 error = EINVAL;
4084 goto out;
4085 }
4086 #ifdef MAC
4087 error = mac_vnode_check_revoke(td->td_ucred, vp);
4088 if (error != 0)
4089 goto out;
4090 #endif
4091 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4092 if (error != 0)
4093 goto out;
4094 if (td->td_ucred->cr_uid != vattr.va_uid) {
4095 error = priv_check(td, PRIV_VFS_ADMIN);
4096 if (error != 0)
4097 goto out;
4098 }
4099 if (vcount(vp) > 1)
4100 VOP_REVOKE(vp, REVOKEALL);
4101 out:
4102 vput(vp);
4103 return (error);
4104 }
4105
4106 /*
4107 * Convert a user file descriptor to a kernel file entry and check that, if it
4108 * is a capability, the correct rights are present. A reference on the file
4109 * entry is held upon returning.
4110 */
4111 int
getvnode(struct thread * td,int fd,cap_rights_t * rightsp,struct file ** fpp)4112 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
4113 {
4114 struct file *fp;
4115 int error;
4116
4117 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL);
4118 if (error != 0)
4119 return (error);
4120
4121 /*
4122 * The file could be not of the vnode type, or it may be not
4123 * yet fully initialized, in which case the f_vnode pointer
4124 * may be set, but f_ops is still badfileops. E.g.,
4125 * devfs_open() transiently create such situation to
4126 * facilitate csw d_fdopen().
4127 *
4128 * Dupfdopen() handling in kern_openat() installs the
4129 * half-baked file into the process descriptor table, allowing
4130 * other thread to dereference it. Guard against the race by
4131 * checking f_ops.
4132 */
4133 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
4134 fdrop(fp, td);
4135 return (EINVAL);
4136 }
4137 *fpp = fp;
4138 return (0);
4139 }
4140
4141
4142 /*
4143 * Get an (NFS) file handle.
4144 */
4145 #ifndef _SYS_SYSPROTO_H_
4146 struct lgetfh_args {
4147 char *fname;
4148 fhandle_t *fhp;
4149 };
4150 #endif
4151 int
sys_lgetfh(struct thread * td,struct lgetfh_args * uap)4152 sys_lgetfh(struct thread *td, struct lgetfh_args *uap)
4153 {
4154
4155 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname,
4156 UIO_USERSPACE, uap->fhp));
4157 }
4158
4159 #ifndef _SYS_SYSPROTO_H_
4160 struct getfh_args {
4161 char *fname;
4162 fhandle_t *fhp;
4163 };
4164 #endif
4165 int
sys_getfh(struct thread * td,struct getfh_args * uap)4166 sys_getfh(struct thread *td, struct getfh_args *uap)
4167 {
4168
4169 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE,
4170 uap->fhp));
4171 }
4172
4173 /*
4174 * syscall for the rpc.lockd to use to translate an open descriptor into
4175 * a NFS file handle.
4176 *
4177 * warning: do not remove the priv_check() call or this becomes one giant
4178 * security hole.
4179 */
4180 #ifndef _SYS_SYSPROTO_H_
4181 struct getfhat_args {
4182 int fd;
4183 char *path;
4184 fhandle_t *fhp;
4185 int flags;
4186 };
4187 #endif
4188 int
sys_getfhat(struct thread * td,struct getfhat_args * uap)4189 sys_getfhat(struct thread *td, struct getfhat_args *uap)
4190 {
4191
4192 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW)) != 0)
4193 return (EINVAL);
4194 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE,
4195 uap->fhp));
4196 }
4197
4198 static int
kern_getfhat(struct thread * td,int flags,int fd,const char * path,enum uio_seg pathseg,fhandle_t * fhp)4199 kern_getfhat(struct thread *td, int flags, int fd, const char *path,
4200 enum uio_seg pathseg, fhandle_t *fhp)
4201 {
4202 struct nameidata nd;
4203 fhandle_t fh;
4204 struct vnode *vp;
4205 int error;
4206
4207 error = priv_check(td, PRIV_VFS_GETFH);
4208 if (error != 0)
4209 return (error);
4210 NDINIT_AT(&nd, LOOKUP, ((flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW :
4211 FOLLOW) | /*((flags & AT_BENEATH) != 0 ? BENEATH : 0) |*/ LOCKLEAF |
4212 AUDITVNODE1, pathseg, path, fd, td);
4213 error = namei(&nd);
4214 if (error != 0)
4215 return (error);
4216 NDFREE(&nd, NDF_ONLY_PNBUF);
4217 vp = nd.ni_vp;
4218 bzero(&fh, sizeof(fh));
4219 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4220 error = VOP_VPTOFH(vp, &fh.fh_fid);
4221 vput(vp);
4222 if (error == 0)
4223 error = copyout(&fh, fhp, sizeof (fh));
4224 return (error);
4225 }
4226
4227 #ifndef _SYS_SYSPROTO_H_
4228 struct fhlink_args {
4229 fhandle_t *fhp;
4230 const char *to;
4231 };
4232 #endif
4233 int
sys_fhlink(struct thread * td,struct fhlink_args * uap)4234 sys_fhlink(struct thread *td, struct fhlink_args *uap)
4235 {
4236
4237 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp));
4238 }
4239
4240 #ifndef _SYS_SYSPROTO_H_
4241 struct fhlinkat_args {
4242 fhandle_t *fhp;
4243 int tofd;
4244 const char *to;
4245 };
4246 #endif
4247 int
sys_fhlinkat(struct thread * td,struct fhlinkat_args * uap)4248 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap)
4249 {
4250
4251 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp));
4252 }
4253
4254 static int
kern_fhlinkat(struct thread * td,int fd,const char * path,enum uio_seg pathseg,fhandle_t * fhp)4255 kern_fhlinkat(struct thread *td, int fd, const char *path,
4256 enum uio_seg pathseg, fhandle_t *fhp)
4257 {
4258 fhandle_t fh;
4259 struct mount *mp;
4260 struct vnode *vp;
4261 int error;
4262
4263 error = priv_check(td, PRIV_VFS_GETFH);
4264 if (error != 0)
4265 return (error);
4266 error = copyin(fhp, &fh, sizeof(fh));
4267 if (error != 0)
4268 return (error);
4269 do {
4270 bwillwrite();
4271 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4272 return (ESTALE);
4273 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4274 vfs_unbusy(mp);
4275 if (error != 0)
4276 return (error);
4277 VOP_UNLOCK(vp, 0);
4278 } while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN);
4279 return (error);
4280 }
4281
4282 #ifndef _SYS_SYSPROTO_H_
4283 struct fhreadlink_args {
4284 fhandle_t *fhp;
4285 char *buf;
4286 size_t bufsize;
4287 };
4288 #endif
4289 int
sys_fhreadlink(struct thread * td,struct fhreadlink_args * uap)4290 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap)
4291 {
4292 fhandle_t fh;
4293 struct mount *mp;
4294 struct vnode *vp;
4295 int error;
4296
4297 error = priv_check(td, PRIV_VFS_GETFH);
4298 if (error != 0)
4299 return (error);
4300 if (uap->bufsize > IOSIZE_MAX)
4301 return (EINVAL);
4302 error = copyin(uap->fhp, &fh, sizeof(fh));
4303 if (error != 0)
4304 return (error);
4305 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4306 return (ESTALE);
4307 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4308 vfs_unbusy(mp);
4309 if (error != 0)
4310 return (error);
4311 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td);
4312 vput(vp);
4313 return (error);
4314 }
4315
4316 /*
4317 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4318 * open descriptor.
4319 *
4320 * warning: do not remove the priv_check() call or this becomes one giant
4321 * security hole.
4322 */
4323 #ifndef _SYS_SYSPROTO_H_
4324 struct fhopen_args {
4325 const struct fhandle *u_fhp;
4326 int flags;
4327 };
4328 #endif
4329 int
sys_fhopen(struct thread * td,struct fhopen_args * uap)4330 sys_fhopen(struct thread *td, struct fhopen_args *uap)
4331 {
4332 struct mount *mp;
4333 struct vnode *vp;
4334 struct fhandle fhp;
4335 struct file *fp;
4336 int fmode, error;
4337 int indx;
4338
4339 error = priv_check(td, PRIV_VFS_FHOPEN);
4340 if (error != 0)
4341 return (error);
4342 indx = -1;
4343 fmode = FFLAGS(uap->flags);
4344 /* why not allow a non-read/write open for our lockd? */
4345 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4346 return (EINVAL);
4347 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
4348 if (error != 0)
4349 return(error);
4350 /* find the mount point */
4351 mp = vfs_busyfs(&fhp.fh_fsid);
4352 if (mp == NULL)
4353 return (ESTALE);
4354 /* now give me my vnode, it gets returned to me locked */
4355 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4356 vfs_unbusy(mp);
4357 if (error != 0)
4358 return (error);
4359
4360 error = falloc_noinstall(td, &fp);
4361 if (error != 0) {
4362 vput(vp);
4363 return (error);
4364 }
4365 /*
4366 * An extra reference on `fp' has been held for us by
4367 * falloc_noinstall().
4368 */
4369
4370 #ifdef INVARIANTS
4371 td->td_dupfd = -1;
4372 #endif
4373 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4374 if (error != 0) {
4375 KASSERT(fp->f_ops == &badfileops,
4376 ("VOP_OPEN in fhopen() set f_ops"));
4377 KASSERT(td->td_dupfd < 0,
4378 ("fhopen() encountered fdopen()"));
4379
4380 vput(vp);
4381 goto bad;
4382 }
4383 #ifdef INVARIANTS
4384 td->td_dupfd = 0;
4385 #endif
4386 fp->f_vnode = vp;
4387 fp->f_seqcount = 1;
4388 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
4389 &vnops);
4390 VOP_UNLOCK(vp, 0);
4391 if ((fmode & O_TRUNC) != 0) {
4392 error = fo_truncate(fp, 0, td->td_ucred, td);
4393 if (error != 0)
4394 goto bad;
4395 }
4396
4397 error = finstall(td, fp, &indx, fmode, NULL);
4398 bad:
4399 fdrop(fp, td);
4400 td->td_retval[0] = indx;
4401 return (error);
4402 }
4403
4404 /*
4405 * Stat an (NFS) file handle.
4406 */
4407 #ifndef _SYS_SYSPROTO_H_
4408 struct fhstat_args {
4409 struct fhandle *u_fhp;
4410 struct stat *sb;
4411 };
4412 #endif
4413 int
sys_fhstat(struct thread * td,struct fhstat_args * uap)4414 sys_fhstat(struct thread *td, struct fhstat_args *uap)
4415 {
4416 struct stat sb;
4417 struct fhandle fh;
4418 int error;
4419
4420 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4421 if (error != 0)
4422 return (error);
4423 error = kern_fhstat(td, fh, &sb);
4424 if (error == 0)
4425 error = copyout(&sb, uap->sb, sizeof(sb));
4426 return (error);
4427 }
4428
4429 int
kern_fhstat(struct thread * td,struct fhandle fh,struct stat * sb)4430 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4431 {
4432 struct mount *mp;
4433 struct vnode *vp;
4434 int error;
4435
4436 error = priv_check(td, PRIV_VFS_FHSTAT);
4437 if (error != 0)
4438 return (error);
4439 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4440 return (ESTALE);
4441 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4442 vfs_unbusy(mp);
4443 if (error != 0)
4444 return (error);
4445 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
4446 vput(vp);
4447 return (error);
4448 }
4449
4450 /*
4451 * Implement fstatfs() for (NFS) file handles.
4452 */
4453 #ifndef _SYS_SYSPROTO_H_
4454 struct fhstatfs_args {
4455 struct fhandle *u_fhp;
4456 struct statfs *buf;
4457 };
4458 #endif
4459 int
sys_fhstatfs(struct thread * td,struct fhstatfs_args * uap)4460 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap)
4461 {
4462 struct statfs *sfp;
4463 fhandle_t fh;
4464 int error;
4465
4466 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4467 if (error != 0)
4468 return (error);
4469 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
4470 error = kern_fhstatfs(td, fh, sfp);
4471 if (error == 0)
4472 error = copyout(sfp, uap->buf, sizeof(*sfp));
4473 free(sfp, M_STATFS);
4474 return (error);
4475 }
4476
4477 int
kern_fhstatfs(struct thread * td,fhandle_t fh,struct statfs * buf)4478 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4479 {
4480 struct statfs *sp;
4481 struct mount *mp;
4482 struct vnode *vp;
4483 int error;
4484
4485 error = priv_check(td, PRIV_VFS_FHSTATFS);
4486 if (error != 0)
4487 return (error);
4488 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4489 return (ESTALE);
4490 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4491 if (error != 0) {
4492 vfs_unbusy(mp);
4493 return (error);
4494 }
4495 vput(vp);
4496 error = prison_canseemount(td->td_ucred, mp);
4497 if (error != 0)
4498 goto out;
4499 #ifdef MAC
4500 error = mac_mount_check_stat(td->td_ucred, mp);
4501 if (error != 0)
4502 goto out;
4503 #endif
4504 /*
4505 * Set these in case the underlying filesystem fails to do so.
4506 */
4507 sp = &mp->mnt_stat;
4508 sp->f_version = STATFS_VERSION;
4509 sp->f_namemax = NAME_MAX;
4510 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
4511 error = VFS_STATFS(mp, sp);
4512 if (error == 0)
4513 *buf = *sp;
4514 out:
4515 vfs_unbusy(mp);
4516 return (error);
4517 }
4518
4519 int
kern_posix_fallocate(struct thread * td,int fd,off_t offset,off_t len)4520 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
4521 {
4522 struct file *fp;
4523 struct mount *mp;
4524 struct vnode *vp;
4525 off_t olen, ooffset;
4526 int error;
4527 #ifdef AUDIT
4528 int audited_vnode1 = 0;
4529 #endif
4530
4531 AUDIT_ARG_FD(fd);
4532 if (offset < 0 || len <= 0)
4533 return (EINVAL);
4534 /* Check for wrap. */
4535 if (offset > OFF_MAX - len)
4536 return (EFBIG);
4537 AUDIT_ARG_FD(fd);
4538 error = fget(td, fd, &cap_pwrite_rights, &fp);
4539 if (error != 0)
4540 return (error);
4541 AUDIT_ARG_FILE(td->td_proc, fp);
4542 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4543 error = ESPIPE;
4544 goto out;
4545 }
4546 if ((fp->f_flag & FWRITE) == 0) {
4547 error = EBADF;
4548 goto out;
4549 }
4550 if (fp->f_type != DTYPE_VNODE) {
4551 error = ENODEV;
4552 goto out;
4553 }
4554 vp = fp->f_vnode;
4555 if (vp->v_type != VREG) {
4556 error = ENODEV;
4557 goto out;
4558 }
4559
4560 /* Allocating blocks may take a long time, so iterate. */
4561 for (;;) {
4562 olen = len;
4563 ooffset = offset;
4564
4565 bwillwrite();
4566 mp = NULL;
4567 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
4568 if (error != 0)
4569 break;
4570 error = vn_lock(vp, LK_EXCLUSIVE);
4571 if (error != 0) {
4572 vn_finished_write(mp);
4573 break;
4574 }
4575 #ifdef AUDIT
4576 if (!audited_vnode1) {
4577 AUDIT_ARG_VNODE1(vp);
4578 audited_vnode1 = 1;
4579 }
4580 #endif
4581 #ifdef MAC
4582 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
4583 if (error == 0)
4584 #endif
4585 error = VOP_ALLOCATE(vp, &offset, &len);
4586 VOP_UNLOCK(vp, 0);
4587 vn_finished_write(mp);
4588
4589 if (olen + ooffset != offset + len) {
4590 panic("offset + len changed from %jx/%jx to %jx/%jx",
4591 ooffset, olen, offset, len);
4592 }
4593 if (error != 0 || len == 0)
4594 break;
4595 KASSERT(olen > len, ("Iteration did not make progress?"));
4596 maybe_yield();
4597 }
4598 out:
4599 fdrop(fp, td);
4600 return (error);
4601 }
4602
4603 int
sys_posix_fallocate(struct thread * td,struct posix_fallocate_args * uap)4604 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
4605 {
4606 int error;
4607
4608 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len);
4609 return (kern_posix_error(td, error));
4610 }
4611
4612 /*
4613 * Unlike madvise(2), we do not make a best effort to remember every
4614 * possible caching hint. Instead, we remember the last setting with
4615 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4616 * region of any current setting.
4617 */
4618 int
kern_posix_fadvise(struct thread * td,int fd,off_t offset,off_t len,int advice)4619 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4620 int advice)
4621 {
4622 struct fadvise_info *fa, *new;
4623 struct file *fp;
4624 struct vnode *vp;
4625 off_t end;
4626 int error;
4627
4628 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4629 return (EINVAL);
4630 AUDIT_ARG_VALUE(advice);
4631 switch (advice) {
4632 case POSIX_FADV_SEQUENTIAL:
4633 case POSIX_FADV_RANDOM:
4634 case POSIX_FADV_NOREUSE:
4635 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4636 break;
4637 case POSIX_FADV_NORMAL:
4638 case POSIX_FADV_WILLNEED:
4639 case POSIX_FADV_DONTNEED:
4640 new = NULL;
4641 break;
4642 default:
4643 return (EINVAL);
4644 }
4645 /* XXX: CAP_POSIX_FADVISE? */
4646 AUDIT_ARG_FD(fd);
4647 error = fget(td, fd, &cap_no_rights, &fp);
4648 if (error != 0)
4649 goto out;
4650 AUDIT_ARG_FILE(td->td_proc, fp);
4651 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4652 error = ESPIPE;
4653 goto out;
4654 }
4655 if (fp->f_type != DTYPE_VNODE) {
4656 error = ENODEV;
4657 goto out;
4658 }
4659 vp = fp->f_vnode;
4660 if (vp->v_type != VREG) {
4661 error = ENODEV;
4662 goto out;
4663 }
4664 if (len == 0)
4665 end = OFF_MAX;
4666 else
4667 end = offset + len - 1;
4668 switch (advice) {
4669 case POSIX_FADV_SEQUENTIAL:
4670 case POSIX_FADV_RANDOM:
4671 case POSIX_FADV_NOREUSE:
4672 /*
4673 * Try to merge any existing non-standard region with
4674 * this new region if possible, otherwise create a new
4675 * non-standard region for this request.
4676 */
4677 mtx_pool_lock(mtxpool_sleep, fp);
4678 fa = fp->f_advice;
4679 if (fa != NULL && fa->fa_advice == advice &&
4680 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4681 (end != OFF_MAX && fa->fa_start == end + 1) ||
4682 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4683 if (offset < fa->fa_start)
4684 fa->fa_start = offset;
4685 if (end > fa->fa_end)
4686 fa->fa_end = end;
4687 } else {
4688 new->fa_advice = advice;
4689 new->fa_start = offset;
4690 new->fa_end = end;
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
sys_posix_fadvise(struct thread * td,struct posix_fadvise_args * uap)4741 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4742 {
4743 int error;
4744
4745 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
4746 uap->advice);
4747 return (kern_posix_error(td, error));
4748 }
4749