2 * SPDX-License-Identifier: BSD-3-Clause
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.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
36 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include "opt_capsicum.h"
43 #include "opt_ktrace.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
49 #include <sys/capsicum.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>
61 #include <sys/filio.h>
62 #include <sys/limits.h>
63 #include <sys/linker.h>
64 #include <sys/rwlock.h>
68 #include <sys/unistd.h>
69 #include <sys/vnode.h>
72 #include <sys/dirent.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysctl.h>
77 #include <sys/ktrace.h>
80 #include <machine/stdarg.h>
82 #include <security/audit/audit.h>
83 #include <security/mac/mac_framework.h>
86 #include <vm/vm_object.h>
87 #include <vm/vm_page.h>
90 #include <fs/devfs/devfs.h>
92 #include <ufs/ufs/quota.h>
94 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
96 static int kern_chflagsat(struct thread *td, int fd, const char *path,
97 enum uio_seg pathseg, u_long flags, int atflag);
98 static int setfflags(struct thread *td, struct vnode *, u_long);
99 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
100 static int getutimens(const struct timespec *, enum uio_seg,
101 struct timespec *, int *);
102 static int setutimes(struct thread *td, struct vnode *,
103 const struct timespec *, int, int);
104 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
106 static int kern_fhlinkat(struct thread *td, int fd, const char *path,
107 enum uio_seg pathseg, fhandle_t *fhp);
108 static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg,
109 size_t count, struct thread *td);
110 static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd,
111 const char *path, enum uio_seg segflag);
114 at2cnpflags(u_int at_flags, u_int mask)
118 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) !=
119 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW));
123 if ((at_flags & AT_RESOLVE_BENEATH) != 0)
125 if ((at_flags & AT_SYMLINK_FOLLOW) != 0)
127 /* NOFOLLOW is pseudo flag */
128 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) {
129 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW :
132 if ((mask & AT_EMPTY_PATH) != 0 && (at_flags & AT_EMPTY_PATH) != 0)
138 kern_sync(struct thread *td)
140 struct mount *mp, *nmp;
143 mtx_lock(&mountlist_mtx);
144 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
145 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
146 nmp = TAILQ_NEXT(mp, mnt_list);
149 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
150 vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
151 save = curthread_pflags_set(TDP_SYNCIO);
152 vfs_periodic(mp, MNT_NOWAIT);
153 VFS_SYNC(mp, MNT_NOWAIT);
154 curthread_pflags_restore(save);
155 vn_finished_write(mp);
157 mtx_lock(&mountlist_mtx);
158 nmp = TAILQ_NEXT(mp, mnt_list);
161 mtx_unlock(&mountlist_mtx);
166 * Sync each mounted filesystem.
168 #ifndef _SYS_SYSPROTO_H_
175 sys_sync(struct thread *td, struct sync_args *uap)
178 return (kern_sync(td));
182 * Change filesystem quotas.
184 #ifndef _SYS_SYSPROTO_H_
185 struct quotactl_args {
193 sys_quotactl(struct thread *td, struct quotactl_args *uap)
199 AUDIT_ARG_CMD(uap->cmd);
200 AUDIT_ARG_UID(uap->uid);
201 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
203 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
205 if ((error = namei(&nd)) != 0)
207 NDFREE(&nd, NDF_ONLY_PNBUF);
208 mp = nd.ni_vp->v_mount;
211 error = vfs_busy(mp, 0);
216 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
219 * Since quota on operation typically needs to open quota
220 * file, the Q_QUOTAON handler needs to unbusy the mount point
221 * before calling into namei. Otherwise, unmount might be
222 * started between two vfs_busy() invocations (first is our,
223 * second is from mount point cross-walk code in lookup()),
226 * Require that Q_QUOTAON handles the vfs_busy() reference on
227 * its own, always returning with ubusied mount point.
229 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON &&
230 (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF)
237 * Used by statfs conversion routines to scale the block size up if
238 * necessary so that all of the block counts are <= 'max_size'. Note
239 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
243 statfs_scale_blocks(struct statfs *sf, long max_size)
248 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
251 * Attempt to scale the block counts to give a more accurate
252 * overview to userland of the ratio of free space to used
253 * space. To do this, find the largest block count and compute
254 * a divisor that lets it fit into a signed integer <= max_size.
256 if (sf->f_bavail < 0)
257 count = -sf->f_bavail;
259 count = sf->f_bavail;
260 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
261 if (count <= max_size)
264 count >>= flsl(max_size);
271 sf->f_bsize <<= shift;
272 sf->f_blocks >>= shift;
273 sf->f_bfree >>= shift;
274 sf->f_bavail >>= shift;
278 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
284 error = vfs_busy(mp, 0);
289 error = mac_mount_check_stat(td->td_ucred, mp);
293 error = VFS_STATFS(mp, buf);
296 if (priv_check_cred_vfs_generation(td->td_ucred)) {
297 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
298 prison_enforce_statfs(td->td_ucred, mp, buf);
306 * Get filesystem statistics.
308 #ifndef _SYS_SYSPROTO_H_
315 sys_statfs(struct thread *td, struct statfs_args *uap)
320 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
321 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
323 error = copyout(sfp, uap->buf, sizeof(struct statfs));
329 kern_statfs(struct thread *td, const char *path, enum uio_seg pathseg,
336 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
340 mp = vfs_ref_from_vp(nd.ni_vp);
343 return (kern_do_statfs(td, mp, buf));
347 * Get filesystem statistics.
349 #ifndef _SYS_SYSPROTO_H_
350 struct fstatfs_args {
356 sys_fstatfs(struct thread *td, struct fstatfs_args *uap)
361 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
362 error = kern_fstatfs(td, uap->fd, sfp);
364 error = copyout(sfp, uap->buf, sizeof(struct statfs));
370 kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
378 error = getvnode_path(td, fd, &cap_fstatfs_rights, &fp);
383 if (AUDITING_TD(td)) {
384 vn_lock(vp, LK_SHARED | LK_RETRY);
385 AUDIT_ARG_VNODE1(vp);
389 mp = vfs_ref_from_vp(vp);
391 return (kern_do_statfs(td, mp, buf));
395 * Get statistics on all filesystems.
397 #ifndef _SYS_SYSPROTO_H_
398 struct getfsstat_args {
405 sys_getfsstat(struct thread *td, struct getfsstat_args *uap)
410 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX)
412 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count,
413 UIO_USERSPACE, uap->mode);
415 td->td_retval[0] = count;
420 * If (bufsize > 0 && bufseg == UIO_SYSSPACE)
421 * The caller is responsible for freeing memory which will be allocated
425 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
426 size_t *countp, enum uio_seg bufseg, int mode)
428 struct mount *mp, *nmp;
429 struct statfs *sfsp, *sp, *sptmp, *tofree;
430 size_t count, maxcount;
438 if (bufseg == UIO_SYSSPACE)
443 maxcount = bufsize / sizeof(struct statfs);
447 } else if (bufseg == UIO_USERSPACE) {
450 } else /* if (bufseg == UIO_SYSSPACE) */ {
452 mtx_lock(&mountlist_mtx);
453 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
456 mtx_unlock(&mountlist_mtx);
457 if (maxcount > count)
459 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs),
466 * If there is no target buffer they only want the count.
468 * This could be TAILQ_FOREACH but it is open-coded to match the original
472 mtx_lock(&mountlist_mtx);
473 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
474 if (prison_canseemount(td->td_ucred, mp) != 0) {
475 nmp = TAILQ_NEXT(mp, mnt_list);
479 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
480 nmp = TAILQ_NEXT(mp, mnt_list);
485 nmp = TAILQ_NEXT(mp, mnt_list);
487 mtx_unlock(&mountlist_mtx);
493 * They want the entire thing.
495 * Short-circuit the corner case of no room for anything, avoids
502 mtx_lock(&mountlist_mtx);
503 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
504 if (prison_canseemount(td->td_ucred, mp) != 0) {
505 nmp = TAILQ_NEXT(mp, mnt_list);
509 if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
510 nmp = TAILQ_NEXT(mp, mnt_list);
514 if (mode == MNT_WAIT) {
515 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) {
517 * If vfs_busy() failed, and MBF_NOWAIT
518 * wasn't passed, then the mp is gone.
519 * Furthermore, because of MBF_MNTLSTLOCK,
520 * the mountlist_mtx was dropped. We have
521 * no other choice than to start over.
523 mtx_unlock(&mountlist_mtx);
524 free(tofree, M_STATFS);
528 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
529 nmp = TAILQ_NEXT(mp, mnt_list);
535 * If MNT_NOWAIT is specified, do not refresh
538 if (mode != MNT_NOWAIT) {
539 error = VFS_STATFS(mp, sp);
541 mtx_lock(&mountlist_mtx);
542 nmp = TAILQ_NEXT(mp, mnt_list);
547 if (priv_check_cred_vfs_generation(td->td_ucred)) {
548 sptmp = malloc(sizeof(struct statfs), M_STATFS,
551 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0;
552 prison_enforce_statfs(td->td_ucred, mp, sptmp);
556 if (bufseg == UIO_SYSSPACE) {
557 bcopy(sp, sfsp, sizeof(*sp));
558 free(sptmp, M_STATFS);
559 } else /* if (bufseg == UIO_USERSPACE) */ {
560 error = copyout(sp, sfsp, sizeof(*sp));
561 free(sptmp, M_STATFS);
570 if (count == maxcount) {
575 mtx_lock(&mountlist_mtx);
576 nmp = TAILQ_NEXT(mp, mnt_list);
579 mtx_unlock(&mountlist_mtx);
585 #ifdef COMPAT_FREEBSD4
587 * Get old format filesystem statistics.
589 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *);
591 #ifndef _SYS_SYSPROTO_H_
592 struct freebsd4_statfs_args {
598 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap)
604 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
605 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
607 freebsd4_cvtstatfs(sfp, &osb);
608 error = copyout(&osb, uap->buf, sizeof(osb));
615 * Get filesystem statistics.
617 #ifndef _SYS_SYSPROTO_H_
618 struct freebsd4_fstatfs_args {
624 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap)
630 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
631 error = kern_fstatfs(td, uap->fd, sfp);
633 freebsd4_cvtstatfs(sfp, &osb);
634 error = copyout(&osb, uap->buf, sizeof(osb));
641 * Get statistics on all filesystems.
643 #ifndef _SYS_SYSPROTO_H_
644 struct freebsd4_getfsstat_args {
651 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap)
653 struct statfs *buf, *sp;
658 if (uap->bufsize < 0)
660 count = uap->bufsize / sizeof(struct ostatfs);
661 if (count > SIZE_MAX / sizeof(struct statfs))
663 size = count * sizeof(struct statfs);
664 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
667 td->td_retval[0] = count;
670 while (count != 0 && error == 0) {
671 freebsd4_cvtstatfs(sp, &osb);
672 error = copyout(&osb, uap->buf, sizeof(osb));
683 * Implement fstatfs() for (NFS) file handles.
685 #ifndef _SYS_SYSPROTO_H_
686 struct freebsd4_fhstatfs_args {
687 struct fhandle *u_fhp;
692 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap)
699 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
702 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
703 error = kern_fhstatfs(td, fh, sfp);
705 freebsd4_cvtstatfs(sfp, &osb);
706 error = copyout(&osb, uap->buf, sizeof(osb));
713 * Convert a new format statfs structure to an old format statfs structure.
716 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp)
719 statfs_scale_blocks(nsp, LONG_MAX);
720 bzero(osp, sizeof(*osp));
721 osp->f_bsize = nsp->f_bsize;
722 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
723 osp->f_blocks = nsp->f_blocks;
724 osp->f_bfree = nsp->f_bfree;
725 osp->f_bavail = nsp->f_bavail;
726 osp->f_files = MIN(nsp->f_files, LONG_MAX);
727 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
728 osp->f_owner = nsp->f_owner;
729 osp->f_type = nsp->f_type;
730 osp->f_flags = nsp->f_flags;
731 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
732 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
733 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
734 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
735 strlcpy(osp->f_fstypename, nsp->f_fstypename,
736 MIN(MFSNAMELEN, OMFSNAMELEN));
737 strlcpy(osp->f_mntonname, nsp->f_mntonname,
738 MIN(MNAMELEN, OMNAMELEN));
739 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
740 MIN(MNAMELEN, OMNAMELEN));
741 osp->f_fsid = nsp->f_fsid;
743 #endif /* COMPAT_FREEBSD4 */
745 #if defined(COMPAT_FREEBSD11)
747 * Get old format filesystem statistics.
749 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *);
752 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap)
754 struct freebsd11_statfs osb;
758 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
759 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
761 freebsd11_cvtstatfs(sfp, &osb);
762 error = copyout(&osb, uap->buf, sizeof(osb));
769 * Get filesystem statistics.
772 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap)
774 struct freebsd11_statfs osb;
778 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
779 error = kern_fstatfs(td, uap->fd, sfp);
781 freebsd11_cvtstatfs(sfp, &osb);
782 error = copyout(&osb, uap->buf, sizeof(osb));
789 * Get statistics on all filesystems.
792 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap)
794 struct freebsd11_statfs osb;
795 struct statfs *buf, *sp;
799 count = uap->bufsize / sizeof(struct ostatfs);
800 size = count * sizeof(struct statfs);
801 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
804 td->td_retval[0] = count;
807 while (count > 0 && error == 0) {
808 freebsd11_cvtstatfs(sp, &osb);
809 error = copyout(&osb, uap->buf, sizeof(osb));
820 * Implement fstatfs() for (NFS) file handles.
823 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap)
825 struct freebsd11_statfs osb;
830 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
833 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
834 error = kern_fhstatfs(td, fh, sfp);
836 freebsd11_cvtstatfs(sfp, &osb);
837 error = copyout(&osb, uap->buf, sizeof(osb));
844 * Convert a new format statfs structure to an old format statfs structure.
847 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp)
850 bzero(osp, sizeof(*osp));
851 osp->f_version = FREEBSD11_STATFS_VERSION;
852 osp->f_type = nsp->f_type;
853 osp->f_flags = nsp->f_flags;
854 osp->f_bsize = nsp->f_bsize;
855 osp->f_iosize = nsp->f_iosize;
856 osp->f_blocks = nsp->f_blocks;
857 osp->f_bfree = nsp->f_bfree;
858 osp->f_bavail = nsp->f_bavail;
859 osp->f_files = nsp->f_files;
860 osp->f_ffree = nsp->f_ffree;
861 osp->f_syncwrites = nsp->f_syncwrites;
862 osp->f_asyncwrites = nsp->f_asyncwrites;
863 osp->f_syncreads = nsp->f_syncreads;
864 osp->f_asyncreads = nsp->f_asyncreads;
865 osp->f_namemax = nsp->f_namemax;
866 osp->f_owner = nsp->f_owner;
867 osp->f_fsid = nsp->f_fsid;
868 strlcpy(osp->f_fstypename, nsp->f_fstypename,
869 MIN(MFSNAMELEN, sizeof(osp->f_fstypename)));
870 strlcpy(osp->f_mntonname, nsp->f_mntonname,
871 MIN(MNAMELEN, sizeof(osp->f_mntonname)));
872 strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
873 MIN(MNAMELEN, sizeof(osp->f_mntfromname)));
875 #endif /* COMPAT_FREEBSD11 */
878 * Change current working directory to a given file descriptor.
880 #ifndef _SYS_SYSPROTO_H_
886 sys_fchdir(struct thread *td, struct fchdir_args *uap)
888 struct vnode *vp, *tdp;
893 AUDIT_ARG_FD(uap->fd);
894 error = getvnode_path(td, uap->fd, &cap_fchdir_rights,
901 vn_lock(vp, LK_SHARED | LK_RETRY);
902 AUDIT_ARG_VNODE1(vp);
903 error = change_dir(vp, td);
904 while (!error && (mp = vp->v_mountedhere) != NULL) {
907 error = VFS_ROOT(mp, LK_SHARED, &tdp);
924 * Change current working directory (``.'').
926 #ifndef _SYS_SYSPROTO_H_
932 sys_chdir(struct thread *td, struct chdir_args *uap)
935 return (kern_chdir(td, uap->path, UIO_USERSPACE));
939 kern_chdir(struct thread *td, const char *path, enum uio_seg pathseg)
944 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
946 if ((error = namei(&nd)) != 0)
948 if ((error = change_dir(nd.ni_vp, td)) != 0) {
953 VOP_UNLOCK(nd.ni_vp);
955 pwd_chdir(td, nd.ni_vp);
960 * Change notion of root (``/'') directory.
962 #ifndef _SYS_SYSPROTO_H_
968 sys_chroot(struct thread *td, struct chroot_args *uap)
973 error = priv_check(td, PRIV_VFS_CHROOT);
976 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
977 UIO_USERSPACE, uap->path, td);
981 error = change_dir(nd.ni_vp, td);
985 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
989 VOP_UNLOCK(nd.ni_vp);
990 error = pwd_chroot(td, nd.ni_vp);
1002 * Common routine for chroot and chdir. Callers must provide a locked vnode
1006 change_dir(struct vnode *vp, struct thread *td)
1012 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
1013 if (vp->v_type != VDIR)
1016 error = mac_vnode_check_chdir(td->td_ucred, vp);
1020 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
1023 static __inline void
1024 flags_to_rights(int flags, cap_rights_t *rightsp)
1026 if (flags & O_EXEC) {
1027 cap_rights_set_one(rightsp, CAP_FEXECVE);
1031 switch ((flags & O_ACCMODE)) {
1033 cap_rights_set_one(rightsp, CAP_READ);
1036 cap_rights_set_one(rightsp, CAP_READ);
1039 cap_rights_set_one(rightsp, CAP_WRITE);
1040 if (!(flags & (O_APPEND | O_TRUNC)))
1041 cap_rights_set_one(rightsp, CAP_SEEK);
1046 if (flags & O_CREAT)
1047 cap_rights_set_one(rightsp, CAP_CREATE);
1049 if (flags & O_TRUNC)
1050 cap_rights_set_one(rightsp, CAP_FTRUNCATE);
1052 if (flags & (O_SYNC | O_FSYNC))
1053 cap_rights_set_one(rightsp, CAP_FSYNC);
1055 if (flags & (O_EXLOCK | O_SHLOCK))
1056 cap_rights_set_one(rightsp, CAP_FLOCK);
1060 * Check permissions, allocate an open file structure, and call the device
1061 * open routine if any.
1063 #ifndef _SYS_SYSPROTO_H_
1071 sys_open(struct thread *td, struct open_args *uap)
1074 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1075 uap->flags, uap->mode));
1078 #ifndef _SYS_SYSPROTO_H_
1079 struct openat_args {
1087 sys_openat(struct thread *td, struct openat_args *uap)
1090 AUDIT_ARG_FD(uap->fd);
1091 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
1096 kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg,
1097 int flags, int mode)
1099 struct proc *p = td->td_proc;
1100 struct filedesc *fdp;
1101 struct pwddesc *pdp;
1104 struct nameidata nd;
1105 cap_rights_t rights;
1106 int cmode, error, indx;
1112 AUDIT_ARG_FFLAGS(flags);
1113 AUDIT_ARG_MODE(mode);
1114 cap_rights_init_one(&rights, CAP_LOOKUP);
1115 flags_to_rights(flags, &rights);
1118 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
1119 * may be specified. On the other hand, for O_PATH any mode
1120 * except O_EXEC is ignored.
1122 if ((flags & O_PATH) != 0) {
1123 flags &= ~(O_CREAT | O_ACCMODE);
1124 } else if ((flags & O_EXEC) != 0) {
1125 if (flags & O_ACCMODE)
1127 } else if ((flags & O_ACCMODE) == O_ACCMODE) {
1130 flags = FFLAGS(flags);
1134 * Allocate a file structure. The descriptor to reference it
1135 * is allocated and used by finstall_refed() below.
1137 error = falloc_noinstall(td, &fp);
1140 /* Set the flags early so the finit in devfs can pick them up. */
1141 fp->f_flag = flags & FMASK;
1142 cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT;
1143 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
1145 td->td_dupfd = -1; /* XXX check for fdopen */
1146 error = vn_open(&nd, &flags, cmode, fp);
1149 * If the vn_open replaced the method vector, something
1150 * wonderous happened deep below and we just pass it up
1151 * pretending we know what we do.
1153 if (error == ENXIO && fp->f_ops != &badfileops) {
1154 MPASS((flags & O_PATH) == 0);
1159 * Handle special fdopen() case. bleh.
1161 * Don't do this for relative (capability) lookups; we don't
1162 * understand exactly what would happen, and we don't think
1163 * that it ever should.
1165 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 &&
1166 (error == ENODEV || error == ENXIO) &&
1167 td->td_dupfd >= 0) {
1168 error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
1177 NDFREE(&nd, NDF_ONLY_PNBUF);
1181 * Store the vnode, for any f_type. Typically, the vnode use
1182 * count is decremented by direct call to vn_closefile() for
1183 * files that switched type in the cdevsw fdopen() method.
1188 * If the file wasn't claimed by devfs bind it to the normal
1189 * vnode operations here.
1191 if (fp->f_ops == &badfileops) {
1192 KASSERT(vp->v_type != VFIFO || (flags & O_PATH) != 0,
1193 ("Unexpected fifo fp %p vp %p", fp, vp));
1194 if ((flags & O_PATH) != 0) {
1195 finit(fp, (flags & FMASK) | (fp->f_flag & FKQALLOWED),
1196 DTYPE_VNODE, NULL, &path_fileops);
1200 finit_vnode(fp, flags, NULL, &vnops);
1205 if (flags & O_TRUNC) {
1206 error = fo_truncate(fp, 0, td->td_ucred, td);
1212 * If we haven't already installed the FD (for dupfdopen), do so now.
1215 struct filecaps *fcaps;
1218 if ((nd.ni_resflags & NIRES_STRICTREL) != 0)
1219 fcaps = &nd.ni_filecaps;
1223 error = finstall_refed(td, fp, &indx, flags, fcaps);
1224 /* On success finstall_refed() consumes fcaps. */
1226 filecaps_free(&nd.ni_filecaps);
1230 filecaps_free(&nd.ni_filecaps);
1231 falloc_abort(td, fp);
1234 td->td_retval[0] = indx;
1237 KASSERT(indx == -1, ("indx=%d, should be -1", indx));
1238 falloc_abort(td, fp);
1246 #ifndef _SYS_SYSPROTO_H_
1247 struct ocreat_args {
1253 ocreat(struct thread *td, struct ocreat_args *uap)
1256 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1257 O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
1259 #endif /* COMPAT_43 */
1262 * Create a special file.
1264 #ifndef _SYS_SYSPROTO_H_
1265 struct mknodat_args {
1273 sys_mknodat(struct thread *td, struct mknodat_args *uap)
1276 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1280 #if defined(COMPAT_FREEBSD11)
1282 freebsd11_mknod(struct thread *td,
1283 struct freebsd11_mknod_args *uap)
1286 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1287 uap->mode, uap->dev));
1291 freebsd11_mknodat(struct thread *td,
1292 struct freebsd11_mknodat_args *uap)
1295 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
1298 #endif /* COMPAT_FREEBSD11 */
1301 kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg,
1302 int mode, dev_t dev)
1307 struct nameidata nd;
1308 int error, whiteout = 0;
1310 AUDIT_ARG_MODE(mode);
1312 switch (mode & S_IFMT) {
1315 error = priv_check(td, PRIV_VFS_MKNOD_DEV);
1316 if (error == 0 && dev == VNOVAL)
1320 error = priv_check(td, PRIV_VFS_MKNOD_WHT);
1324 return (kern_mkfifoat(td, fd, path, pathseg, mode));
1335 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1336 NOCACHE, pathseg, path, fd, &cap_mknodat_rights,
1338 if ((error = namei(&nd)) != 0)
1342 NDFREE(&nd, NDF_ONLY_PNBUF);
1343 if (vp == nd.ni_dvp)
1351 vattr.va_mode = (mode & ALLPERMS) &
1352 ~td->td_proc->p_pd->pd_cmask;
1353 vattr.va_rdev = dev;
1356 switch (mode & S_IFMT) {
1358 vattr.va_type = VCHR;
1361 vattr.va_type = VBLK;
1367 panic("kern_mknod: invalid mode");
1370 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1371 NDFREE(&nd, NDF_ONLY_PNBUF);
1373 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1378 if (error == 0 && !whiteout)
1379 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
1380 &nd.ni_cnd, &vattr);
1384 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
1386 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
1387 &nd.ni_cnd, &vattr);
1390 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 && !whiteout ? &nd.ni_vp : NULL,
1392 vn_finished_write(mp);
1393 NDFREE(&nd, NDF_ONLY_PNBUF);
1394 if (error == ERELOOKUP)
1400 * Create a named pipe.
1402 #ifndef _SYS_SYSPROTO_H_
1403 struct mkfifo_args {
1409 sys_mkfifo(struct thread *td, struct mkfifo_args *uap)
1412 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
1416 #ifndef _SYS_SYSPROTO_H_
1417 struct mkfifoat_args {
1424 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
1427 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
1432 kern_mkfifoat(struct thread *td, int fd, const char *path,
1433 enum uio_seg pathseg, int mode)
1437 struct nameidata nd;
1440 AUDIT_ARG_MODE(mode);
1444 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1445 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights,
1447 if ((error = namei(&nd)) != 0)
1449 if (nd.ni_vp != NULL) {
1450 NDFREE(&nd, NDF_ONLY_PNBUF);
1451 if (nd.ni_vp == nd.ni_dvp)
1458 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1459 NDFREE(&nd, NDF_ONLY_PNBUF);
1461 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1466 vattr.va_type = VFIFO;
1467 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_pd->pd_cmask;
1469 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1474 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
1478 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
1479 vn_finished_write(mp);
1480 NDFREE(&nd, NDF_ONLY_PNBUF);
1481 if (error == ERELOOKUP)
1487 * Make a hard file link.
1489 #ifndef _SYS_SYSPROTO_H_
1496 sys_link(struct thread *td, struct link_args *uap)
1499 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
1500 UIO_USERSPACE, FOLLOW));
1503 #ifndef _SYS_SYSPROTO_H_
1504 struct linkat_args {
1513 sys_linkat(struct thread *td, struct linkat_args *uap)
1518 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH |
1519 AT_EMPTY_PATH)) != 0)
1522 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
1523 UIO_USERSPACE, at2cnpflags(flag, AT_SYMLINK_FOLLOW |
1524 AT_RESOLVE_BENEATH | AT_EMPTY_PATH)));
1527 int hardlink_check_uid = 0;
1528 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1529 &hardlink_check_uid, 0,
1530 "Unprivileged processes cannot create hard links to files owned by other "
1532 static int hardlink_check_gid = 0;
1533 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1534 &hardlink_check_gid, 0,
1535 "Unprivileged processes cannot create hard links to files owned by other "
1539 can_hardlink(struct vnode *vp, struct ucred *cred)
1544 if (!hardlink_check_uid && !hardlink_check_gid)
1547 error = VOP_GETATTR(vp, &va, cred);
1551 if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
1552 error = priv_check_cred(cred, PRIV_VFS_LINK);
1557 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
1558 error = priv_check_cred(cred, PRIV_VFS_LINK);
1567 kern_linkat(struct thread *td, int fd1, int fd2, const char *path1,
1568 const char *path2, enum uio_seg segflag, int follow)
1570 struct nameidata nd;
1576 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag,
1577 path1, fd1, &cap_linkat_source_rights, td);
1578 if ((error = namei(&nd)) != 0)
1580 NDFREE(&nd, NDF_ONLY_PNBUF);
1581 if ((nd.ni_resflags & NIRES_EMPTYPATH) != 0) {
1582 error = priv_check(td, PRIV_VFS_FHOPEN);
1588 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag);
1589 } while (error == EAGAIN || error == ERELOOKUP);
1594 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path,
1595 enum uio_seg segflag)
1597 struct nameidata nd;
1601 if (vp->v_type == VDIR) {
1603 return (EPERM); /* POSIX */
1605 NDINIT_ATRIGHTS(&nd, CREATE,
1606 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd,
1607 &cap_linkat_target_rights, td);
1608 if ((error = namei(&nd)) == 0) {
1609 if (nd.ni_vp != NULL) {
1610 NDFREE(&nd, NDF_ONLY_PNBUF);
1611 if (nd.ni_dvp == nd.ni_vp)
1618 } else if (nd.ni_dvp->v_mount != vp->v_mount) {
1620 * Cross-device link. No need to recheck
1621 * vp->v_type, since it cannot change, except
1624 NDFREE(&nd, NDF_ONLY_PNBUF);
1628 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
1629 error = can_hardlink(vp, td->td_ucred);
1632 error = mac_vnode_check_link(td->td_ucred,
1633 nd.ni_dvp, vp, &nd.ni_cnd);
1638 NDFREE(&nd, NDF_ONLY_PNBUF);
1641 error = vn_start_write(vp, &mp, V_NOWAIT);
1645 NDFREE(&nd, NDF_ONLY_PNBUF);
1646 error = vn_start_write(NULL, &mp,
1652 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
1653 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true);
1654 vn_finished_write(mp);
1655 NDFREE(&nd, NDF_ONLY_PNBUF);
1659 NDFREE(&nd, NDF_ONLY_PNBUF);
1670 * Make a symbolic link.
1672 #ifndef _SYS_SYSPROTO_H_
1673 struct symlink_args {
1679 sys_symlink(struct thread *td, struct symlink_args *uap)
1682 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
1686 #ifndef _SYS_SYSPROTO_H_
1687 struct symlinkat_args {
1694 sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
1697 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
1702 kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2,
1703 enum uio_seg segflg)
1707 const char *syspath;
1709 struct nameidata nd;
1712 if (segflg == UIO_SYSSPACE) {
1715 tmppath = uma_zalloc(namei_zone, M_WAITOK);
1716 if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0)
1720 AUDIT_ARG_TEXT(syspath);
1724 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
1725 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights,
1727 if ((error = namei(&nd)) != 0)
1730 NDFREE(&nd, NDF_ONLY_PNBUF);
1731 if (nd.ni_vp == nd.ni_dvp)
1740 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1741 NDFREE(&nd, NDF_ONLY_PNBUF);
1743 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1748 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_pd->pd_cmask;
1750 vattr.va_type = VLNK;
1751 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
1756 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
1760 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
1761 vn_finished_write(mp);
1762 NDFREE(&nd, NDF_ONLY_PNBUF);
1763 if (error == ERELOOKUP)
1766 if (segflg != UIO_SYSSPACE)
1767 uma_zfree(namei_zone, tmppath);
1772 * Delete a whiteout from the filesystem.
1774 #ifndef _SYS_SYSPROTO_H_
1775 struct undelete_args {
1780 sys_undelete(struct thread *td, struct undelete_args *uap)
1783 struct nameidata nd;
1789 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
1790 UIO_USERSPACE, uap->path, td);
1795 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
1796 NDFREE(&nd, NDF_ONLY_PNBUF);
1797 if (nd.ni_vp == nd.ni_dvp)
1805 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1806 NDFREE(&nd, NDF_ONLY_PNBUF);
1808 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
1812 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
1813 NDFREE(&nd, NDF_ONLY_PNBUF);
1815 vn_finished_write(mp);
1816 if (error == ERELOOKUP)
1822 * Delete a name from the filesystem.
1824 #ifndef _SYS_SYSPROTO_H_
1825 struct unlink_args {
1830 sys_unlink(struct thread *td, struct unlink_args *uap)
1833 return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
1838 kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd,
1839 int flag, enum uio_seg pathseg, ino_t oldinum)
1842 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0)
1845 if ((flag & AT_REMOVEDIR) != 0)
1846 return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0));
1848 return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0));
1851 #ifndef _SYS_SYSPROTO_H_
1852 struct unlinkat_args {
1859 sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
1862 return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag,
1866 #ifndef _SYS_SYSPROTO_H_
1867 struct funlinkat_args {
1875 sys_funlinkat(struct thread *td, struct funlinkat_args *uap)
1878 return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag,
1883 kern_funlinkat(struct thread *td, int dfd, const char *path, int fd,
1884 enum uio_seg pathseg, int flag, ino_t oldinum)
1889 struct nameidata nd;
1894 if (fd != FD_NONE) {
1895 error = getvnode_path(td, fd, &cap_no_rights, &fp);
1903 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
1904 at2cnpflags(flag, AT_RESOLVE_BENEATH),
1905 pathseg, path, dfd, &cap_unlinkat_rights, td);
1906 if ((error = namei(&nd)) != 0) {
1907 if (error == EINVAL)
1912 if (vp->v_type == VDIR && oldinum == 0) {
1913 error = EPERM; /* POSIX */
1914 } else if (oldinum != 0 &&
1915 ((error = VOP_STAT(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
1916 sb.st_ino != oldinum) {
1917 error = EIDRM; /* Identifier removed */
1918 } else if (fp != NULL && fp->f_vnode != vp) {
1919 if (VN_IS_DOOMED(fp->f_vnode))
1925 * The root of a mounted filesystem cannot be deleted.
1927 * XXX: can this only be a VDIR case?
1929 if (vp->v_vflag & VV_ROOT)
1933 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
1934 NDFREE(&nd, NDF_ONLY_PNBUF);
1936 if (vp == nd.ni_dvp)
1940 if ((error = vn_start_write(NULL, &mp,
1941 V_XSLEEP | PCATCH)) != 0) {
1947 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
1952 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
1953 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
1957 vn_finished_write(mp);
1959 NDFREE(&nd, NDF_ONLY_PNBUF);
1961 if (vp == nd.ni_dvp)
1965 if (error == ERELOOKUP)
1974 * Reposition read/write file offset.
1976 #ifndef _SYS_SYSPROTO_H_
1985 sys_lseek(struct thread *td, struct lseek_args *uap)
1988 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
1992 kern_lseek(struct thread *td, int fd, off_t offset, int whence)
1998 error = fget(td, fd, &cap_seek_rights, &fp);
2001 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
2002 fo_seek(fp, offset, whence, td) : ESPIPE;
2007 #if defined(COMPAT_43)
2009 * Reposition read/write file offset.
2011 #ifndef _SYS_SYSPROTO_H_
2012 struct olseek_args {
2019 olseek(struct thread *td, struct olseek_args *uap)
2022 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2024 #endif /* COMPAT_43 */
2026 #if defined(COMPAT_FREEBSD6)
2027 /* Version with the 'pad' argument */
2029 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap)
2032 return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
2037 * Check access permissions using passed credentials.
2040 vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
2046 /* Flags == 0 means only check for existence. */
2047 if (user_flags == 0)
2051 if (user_flags & R_OK)
2053 if (user_flags & W_OK)
2055 if (user_flags & X_OK)
2058 error = mac_vnode_check_access(cred, vp, accmode);
2062 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
2063 error = VOP_ACCESS(vp, accmode, cred, td);
2068 * Check access permissions using "real" credentials.
2070 #ifndef _SYS_SYSPROTO_H_
2071 struct access_args {
2077 sys_access(struct thread *td, struct access_args *uap)
2080 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2084 #ifndef _SYS_SYSPROTO_H_
2085 struct faccessat_args {
2093 sys_faccessat(struct thread *td, struct faccessat_args *uap)
2096 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
2101 kern_accessat(struct thread *td, int fd, const char *path,
2102 enum uio_seg pathseg, int flag, int amode)
2104 struct ucred *cred, *usecred;
2106 struct nameidata nd;
2109 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH | AT_EMPTY_PATH)) != 0)
2111 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
2115 * Create and modify a temporary credential instead of one that
2116 * is potentially shared (if we need one).
2118 cred = td->td_ucred;
2119 if ((flag & AT_EACCESS) == 0 &&
2120 ((cred->cr_uid != cred->cr_ruid ||
2121 cred->cr_rgid != cred->cr_groups[0]))) {
2122 usecred = crdup(cred);
2123 usecred->cr_uid = cred->cr_ruid;
2124 usecred->cr_groups[0] = cred->cr_rgid;
2125 td->td_ucred = usecred;
2128 AUDIT_ARG_VALUE(amode);
2129 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
2130 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH |
2131 AT_EMPTY_PATH), pathseg, path, fd, &cap_fstat_rights, td);
2132 if ((error = namei(&nd)) != 0)
2136 error = vn_access(vp, amode, usecred, td);
2137 NDFREE_NOTHING(&nd);
2140 if (usecred != cred) {
2141 td->td_ucred = cred;
2148 * Check access permissions using "effective" credentials.
2150 #ifndef _SYS_SYSPROTO_H_
2151 struct eaccess_args {
2157 sys_eaccess(struct thread *td, struct eaccess_args *uap)
2160 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2161 AT_EACCESS, uap->amode));
2164 #if defined(COMPAT_43)
2166 * Get file status; this version follows links.
2168 #ifndef _SYS_SYSPROTO_H_
2175 ostat(struct thread *td, struct ostat_args *uap)
2181 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2186 return (copyout(&osb, uap->ub, sizeof (osb)));
2190 * Get file status; this version does not follow links.
2192 #ifndef _SYS_SYSPROTO_H_
2193 struct olstat_args {
2199 olstat(struct thread *td, struct olstat_args *uap)
2205 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2206 UIO_USERSPACE, &sb, NULL);
2210 return (copyout(&osb, uap->ub, sizeof (osb)));
2214 * Convert from an old to a new stat structure.
2215 * XXX: many values are blindly truncated.
2218 cvtstat(struct stat *st, struct ostat *ost)
2221 bzero(ost, sizeof(*ost));
2222 ost->st_dev = st->st_dev;
2223 ost->st_ino = st->st_ino;
2224 ost->st_mode = st->st_mode;
2225 ost->st_nlink = st->st_nlink;
2226 ost->st_uid = st->st_uid;
2227 ost->st_gid = st->st_gid;
2228 ost->st_rdev = st->st_rdev;
2229 ost->st_size = MIN(st->st_size, INT32_MAX);
2230 ost->st_atim = st->st_atim;
2231 ost->st_mtim = st->st_mtim;
2232 ost->st_ctim = st->st_ctim;
2233 ost->st_blksize = st->st_blksize;
2234 ost->st_blocks = st->st_blocks;
2235 ost->st_flags = st->st_flags;
2236 ost->st_gen = st->st_gen;
2238 #endif /* COMPAT_43 */
2240 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
2241 int ino64_trunc_error;
2242 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW,
2243 &ino64_trunc_error, 0,
2244 "Error on truncation of device, file or inode number, or link count");
2247 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost)
2250 ost->st_dev = st->st_dev;
2251 if (ost->st_dev != st->st_dev) {
2252 switch (ino64_trunc_error) {
2255 * Since dev_t is almost raw, don't clamp to the
2256 * maximum for case 2, but ignore the error.
2263 ost->st_ino = st->st_ino;
2264 if (ost->st_ino != st->st_ino) {
2265 switch (ino64_trunc_error) {
2272 ost->st_ino = UINT32_MAX;
2276 ost->st_mode = st->st_mode;
2277 ost->st_nlink = st->st_nlink;
2278 if (ost->st_nlink != st->st_nlink) {
2279 switch (ino64_trunc_error) {
2286 ost->st_nlink = UINT16_MAX;
2290 ost->st_uid = st->st_uid;
2291 ost->st_gid = st->st_gid;
2292 ost->st_rdev = st->st_rdev;
2293 if (ost->st_rdev != st->st_rdev) {
2294 switch (ino64_trunc_error) {
2301 ost->st_atim = st->st_atim;
2302 ost->st_mtim = st->st_mtim;
2303 ost->st_ctim = st->st_ctim;
2304 ost->st_size = st->st_size;
2305 ost->st_blocks = st->st_blocks;
2306 ost->st_blksize = st->st_blksize;
2307 ost->st_flags = st->st_flags;
2308 ost->st_gen = st->st_gen;
2310 ost->st_birthtim = st->st_birthtim;
2311 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim),
2312 sizeof(*ost) - offsetof(struct freebsd11_stat,
2313 st_birthtim) - sizeof(ost->st_birthtim));
2318 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap)
2321 struct freebsd11_stat osb;
2324 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2328 error = freebsd11_cvtstat(&sb, &osb);
2330 error = copyout(&osb, uap->ub, sizeof(osb));
2335 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap)
2338 struct freebsd11_stat osb;
2341 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2342 UIO_USERSPACE, &sb, NULL);
2345 error = freebsd11_cvtstat(&sb, &osb);
2347 error = copyout(&osb, uap->ub, sizeof(osb));
2352 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap)
2356 struct freebsd11_stat osb;
2359 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
2362 error = kern_fhstat(td, fh, &sb);
2365 error = freebsd11_cvtstat(&sb, &osb);
2367 error = copyout(&osb, uap->sb, sizeof(osb));
2372 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap)
2375 struct freebsd11_stat osb;
2378 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2379 UIO_USERSPACE, &sb, NULL);
2382 error = freebsd11_cvtstat(&sb, &osb);
2384 error = copyout(&osb, uap->buf, sizeof(osb));
2387 #endif /* COMPAT_FREEBSD11 */
2392 #ifndef _SYS_SYSPROTO_H_
2393 struct fstatat_args {
2401 sys_fstatat(struct thread *td, struct fstatat_args *uap)
2406 error = kern_statat(td, uap->flag, uap->fd, uap->path,
2407 UIO_USERSPACE, &sb, NULL);
2409 error = copyout(&sb, uap->buf, sizeof (sb));
2414 kern_statat(struct thread *td, int flag, int fd, const char *path,
2415 enum uio_seg pathseg, struct stat *sbp,
2416 void (*hook)(struct vnode *vp, struct stat *sbp))
2418 struct nameidata nd;
2421 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2422 AT_EMPTY_PATH)) != 0)
2425 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH |
2426 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF |
2427 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td);
2429 if ((error = namei(&nd)) != 0)
2431 error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED, td);
2433 if (__predict_false(hook != NULL))
2434 hook(nd.ni_vp, sbp);
2436 NDFREE_NOTHING(&nd);
2438 #ifdef __STAT_TIME_T_EXT
2439 sbp->st_atim_ext = 0;
2440 sbp->st_mtim_ext = 0;
2441 sbp->st_ctim_ext = 0;
2442 sbp->st_btim_ext = 0;
2445 if (KTRPOINT(td, KTR_STRUCT))
2446 ktrstat_error(sbp, error);
2451 #if defined(COMPAT_FREEBSD11)
2453 * Implementation of the NetBSD [l]stat() functions.
2456 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb)
2459 bzero(nsb, sizeof(*nsb));
2460 nsb->st_dev = sb->st_dev;
2461 nsb->st_ino = sb->st_ino;
2462 nsb->st_mode = sb->st_mode;
2463 nsb->st_nlink = sb->st_nlink;
2464 nsb->st_uid = sb->st_uid;
2465 nsb->st_gid = sb->st_gid;
2466 nsb->st_rdev = sb->st_rdev;
2467 nsb->st_atim = sb->st_atim;
2468 nsb->st_mtim = sb->st_mtim;
2469 nsb->st_ctim = sb->st_ctim;
2470 nsb->st_size = sb->st_size;
2471 nsb->st_blocks = sb->st_blocks;
2472 nsb->st_blksize = sb->st_blksize;
2473 nsb->st_flags = sb->st_flags;
2474 nsb->st_gen = sb->st_gen;
2475 nsb->st_birthtim = sb->st_birthtim;
2478 #ifndef _SYS_SYSPROTO_H_
2479 struct freebsd11_nstat_args {
2485 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap)
2491 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
2495 freebsd11_cvtnstat(&sb, &nsb);
2496 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2500 * NetBSD lstat. Get file status; this version does not follow links.
2502 #ifndef _SYS_SYSPROTO_H_
2503 struct freebsd11_nlstat_args {
2509 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap)
2515 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
2516 UIO_USERSPACE, &sb, NULL);
2519 freebsd11_cvtnstat(&sb, &nsb);
2520 return (copyout(&nsb, uap->ub, sizeof (nsb)));
2522 #endif /* COMPAT_FREEBSD11 */
2525 * Get configurable pathname variables.
2527 #ifndef _SYS_SYSPROTO_H_
2528 struct pathconf_args {
2534 sys_pathconf(struct thread *td, struct pathconf_args *uap)
2539 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW,
2542 td->td_retval[0] = value;
2546 #ifndef _SYS_SYSPROTO_H_
2547 struct lpathconf_args {
2553 sys_lpathconf(struct thread *td, struct lpathconf_args *uap)
2558 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
2561 td->td_retval[0] = value;
2566 kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg,
2567 int name, u_long flags, long *valuep)
2569 struct nameidata nd;
2572 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
2574 if ((error = namei(&nd)) != 0)
2576 NDFREE_NOTHING(&nd);
2578 error = VOP_PATHCONF(nd.ni_vp, name, valuep);
2584 * Return target name of a symbolic link.
2586 #ifndef _SYS_SYSPROTO_H_
2587 struct readlink_args {
2594 sys_readlink(struct thread *td, struct readlink_args *uap)
2597 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2598 uap->buf, UIO_USERSPACE, uap->count));
2600 #ifndef _SYS_SYSPROTO_H_
2601 struct readlinkat_args {
2609 sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
2612 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
2613 uap->buf, UIO_USERSPACE, uap->bufsize));
2617 kern_readlinkat(struct thread *td, int fd, const char *path,
2618 enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count)
2621 struct nameidata nd;
2624 if (count > IOSIZE_MAX)
2627 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
2628 pathseg, path, fd, td);
2630 if ((error = namei(&nd)) != 0)
2632 NDFREE_NOTHING(&nd);
2635 error = kern_readlink_vp(vp, buf, bufseg, count, td);
2642 * Helper function to readlink from a vnode
2645 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count,
2652 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked");
2654 error = mac_vnode_check_readlink(td->td_ucred, vp);
2658 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0)
2661 aiov.iov_base = buf;
2662 aiov.iov_len = count;
2663 auio.uio_iov = &aiov;
2664 auio.uio_iovcnt = 1;
2665 auio.uio_offset = 0;
2666 auio.uio_rw = UIO_READ;
2667 auio.uio_segflg = bufseg;
2669 auio.uio_resid = count;
2670 error = VOP_READLINK(vp, &auio, td->td_ucred);
2671 td->td_retval[0] = count - auio.uio_resid;
2676 * Common implementation code for chflags() and fchflags().
2679 setfflags(struct thread *td, struct vnode *vp, u_long flags)
2685 /* We can't support the value matching VNOVAL. */
2686 if (flags == VNOVAL)
2687 return (EOPNOTSUPP);
2690 * Prevent non-root users from setting flags on devices. When
2691 * a device is reused, users can retain ownership of the device
2692 * if they are allowed to set flags and programs assume that
2693 * chown can't fail when done as root.
2695 if (vp->v_type == VCHR || vp->v_type == VBLK) {
2696 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
2701 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2704 vattr.va_flags = flags;
2705 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2707 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
2710 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
2712 vn_finished_write(mp);
2717 * Change flags of a file given a path name.
2719 #ifndef _SYS_SYSPROTO_H_
2720 struct chflags_args {
2726 sys_chflags(struct thread *td, struct chflags_args *uap)
2729 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2733 #ifndef _SYS_SYSPROTO_H_
2734 struct chflagsat_args {
2742 sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
2745 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2746 AT_EMPTY_PATH)) != 0)
2749 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE,
2750 uap->flags, uap->atflag));
2754 * Same as chflags() but doesn't follow symlinks.
2756 #ifndef _SYS_SYSPROTO_H_
2757 struct lchflags_args {
2763 sys_lchflags(struct thread *td, struct lchflags_args *uap)
2766 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2767 uap->flags, AT_SYMLINK_NOFOLLOW));
2771 kern_chflagsat(struct thread *td, int fd, const char *path,
2772 enum uio_seg pathseg, u_long flags, int atflag)
2774 struct nameidata nd;
2777 AUDIT_ARG_FFLAGS(flags);
2778 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW |
2779 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
2780 fd, &cap_fchflags_rights, td);
2781 if ((error = namei(&nd)) != 0)
2783 NDFREE_NOTHING(&nd);
2784 error = setfflags(td, nd.ni_vp, flags);
2790 * Change flags of a file given a file descriptor.
2792 #ifndef _SYS_SYSPROTO_H_
2793 struct fchflags_args {
2799 sys_fchflags(struct thread *td, struct fchflags_args *uap)
2804 AUDIT_ARG_FD(uap->fd);
2805 AUDIT_ARG_FFLAGS(uap->flags);
2806 error = getvnode(td, uap->fd, &cap_fchflags_rights,
2811 if (AUDITING_TD(td)) {
2812 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
2813 AUDIT_ARG_VNODE1(fp->f_vnode);
2814 VOP_UNLOCK(fp->f_vnode);
2817 error = setfflags(td, fp->f_vnode, uap->flags);
2823 * Common implementation code for chmod(), lchmod() and fchmod().
2826 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode)
2832 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2834 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2836 vattr.va_mode = mode & ALLPERMS;
2838 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
2841 error = VOP_SETATTR(vp, &vattr, cred);
2843 vn_finished_write(mp);
2848 * Change mode of a file given path name.
2850 #ifndef _SYS_SYSPROTO_H_
2857 sys_chmod(struct thread *td, struct chmod_args *uap)
2860 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2864 #ifndef _SYS_SYSPROTO_H_
2865 struct fchmodat_args {
2873 sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
2876 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
2877 AT_EMPTY_PATH)) != 0)
2880 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE,
2881 uap->mode, uap->flag));
2885 * Change mode of a file given path name (don't follow links.)
2887 #ifndef _SYS_SYSPROTO_H_
2888 struct lchmod_args {
2894 sys_lchmod(struct thread *td, struct lchmod_args *uap)
2897 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
2898 uap->mode, AT_SYMLINK_NOFOLLOW));
2902 kern_fchmodat(struct thread *td, int fd, const char *path,
2903 enum uio_seg pathseg, mode_t mode, int flag)
2905 struct nameidata nd;
2908 AUDIT_ARG_MODE(mode);
2909 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
2910 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
2911 fd, &cap_fchmod_rights, td);
2912 if ((error = namei(&nd)) != 0)
2914 NDFREE_NOTHING(&nd);
2915 error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
2921 * Change mode of a file given a file descriptor.
2923 #ifndef _SYS_SYSPROTO_H_
2924 struct fchmod_args {
2930 sys_fchmod(struct thread *td, struct fchmod_args *uap)
2935 AUDIT_ARG_FD(uap->fd);
2936 AUDIT_ARG_MODE(uap->mode);
2938 error = fget(td, uap->fd, &cap_fchmod_rights, &fp);
2941 error = fo_chmod(fp, uap->mode, td->td_ucred, td);
2947 * Common implementation for chown(), lchown(), and fchown()
2950 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
2957 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
2959 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2964 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
2968 error = VOP_SETATTR(vp, &vattr, cred);
2970 vn_finished_write(mp);
2975 * Set ownership given a path name.
2977 #ifndef _SYS_SYSPROTO_H_
2985 sys_chown(struct thread *td, struct chown_args *uap)
2988 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid,
2992 #ifndef _SYS_SYSPROTO_H_
2993 struct fchownat_args {
3002 sys_fchownat(struct thread *td, struct fchownat_args *uap)
3005 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3006 AT_EMPTY_PATH)) != 0)
3009 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
3010 uap->gid, uap->flag));
3014 kern_fchownat(struct thread *td, int fd, const char *path,
3015 enum uio_seg pathseg, int uid, int gid, int flag)
3017 struct nameidata nd;
3020 AUDIT_ARG_OWNER(uid, gid);
3021 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3022 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1, pathseg, path,
3023 fd, &cap_fchown_rights, td);
3025 if ((error = namei(&nd)) != 0)
3027 NDFREE_NOTHING(&nd);
3028 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
3034 * Set ownership given a path name, do not cross symlinks.
3036 #ifndef _SYS_SYSPROTO_H_
3037 struct lchown_args {
3044 sys_lchown(struct thread *td, struct lchown_args *uap)
3047 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3048 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
3052 * Set ownership given a file descriptor.
3054 #ifndef _SYS_SYSPROTO_H_
3055 struct fchown_args {
3062 sys_fchown(struct thread *td, struct fchown_args *uap)
3067 AUDIT_ARG_FD(uap->fd);
3068 AUDIT_ARG_OWNER(uap->uid, uap->gid);
3069 error = fget(td, uap->fd, &cap_fchown_rights, &fp);
3072 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
3078 * Common implementation code for utimes(), lutimes(), and futimes().
3081 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg,
3082 struct timespec *tsp)
3084 struct timeval tv[2];
3085 const struct timeval *tvp;
3088 if (usrtvp == NULL) {
3089 vfs_timestamp(&tsp[0]);
3092 if (tvpseg == UIO_SYSSPACE) {
3095 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
3100 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
3101 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
3103 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
3104 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
3110 * Common implementation code for futimens(), utimensat().
3112 #define UTIMENS_NULL 0x1
3113 #define UTIMENS_EXIT 0x2
3115 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
3116 struct timespec *tsp, int *retflags)
3118 struct timespec tsnow;
3121 vfs_timestamp(&tsnow);
3123 if (usrtsp == NULL) {
3126 *retflags |= UTIMENS_NULL;
3129 if (tspseg == UIO_SYSSPACE) {
3132 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
3134 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
3135 *retflags |= UTIMENS_EXIT;
3136 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
3137 *retflags |= UTIMENS_NULL;
3138 if (tsp[0].tv_nsec == UTIME_OMIT)
3139 tsp[0].tv_sec = VNOVAL;
3140 else if (tsp[0].tv_nsec == UTIME_NOW)
3142 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
3144 if (tsp[1].tv_nsec == UTIME_OMIT)
3145 tsp[1].tv_sec = VNOVAL;
3146 else if (tsp[1].tv_nsec == UTIME_NOW)
3148 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
3155 * Common implementation code for utimes(), lutimes(), futimes(), futimens(),
3159 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts,
3160 int numtimes, int nullflag)
3164 int error, setbirthtime;
3166 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
3168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3170 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
3171 timespeccmp(&ts[1], &vattr.va_birthtime, < ))
3174 vattr.va_atime = ts[0];
3175 vattr.va_mtime = ts[1];
3177 vattr.va_birthtime = ts[1];
3179 vattr.va_birthtime = ts[2];
3181 vattr.va_vaflags |= VA_UTIMES_NULL;
3183 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
3187 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3189 vn_finished_write(mp);
3194 * Set the access and modification times of a file.
3196 #ifndef _SYS_SYSPROTO_H_
3197 struct utimes_args {
3199 struct timeval *tptr;
3203 sys_utimes(struct thread *td, struct utimes_args *uap)
3206 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3207 uap->tptr, UIO_USERSPACE));
3210 #ifndef _SYS_SYSPROTO_H_
3211 struct futimesat_args {
3214 const struct timeval * times;
3218 sys_futimesat(struct thread *td, struct futimesat_args *uap)
3221 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
3222 uap->times, UIO_USERSPACE));
3226 kern_utimesat(struct thread *td, int fd, const char *path,
3227 enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg)
3229 struct nameidata nd;
3230 struct timespec ts[2];
3233 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3235 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
3236 &cap_futimes_rights, td);
3238 if ((error = namei(&nd)) != 0)
3240 NDFREE_NOTHING(&nd);
3241 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3247 * Set the access and modification times of a file.
3249 #ifndef _SYS_SYSPROTO_H_
3250 struct lutimes_args {
3252 struct timeval *tptr;
3256 sys_lutimes(struct thread *td, struct lutimes_args *uap)
3259 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
3264 kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg,
3265 struct timeval *tptr, enum uio_seg tptrseg)
3267 struct timespec ts[2];
3268 struct nameidata nd;
3271 if ((error = getutimes(tptr, tptrseg, ts)) != 0)
3273 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
3274 if ((error = namei(&nd)) != 0)
3276 NDFREE_NOTHING(&nd);
3277 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
3283 * Set the access and modification times of a file.
3285 #ifndef _SYS_SYSPROTO_H_
3286 struct futimes_args {
3288 struct timeval *tptr;
3292 sys_futimes(struct thread *td, struct futimes_args *uap)
3295 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
3299 kern_futimes(struct thread *td, int fd, struct timeval *tptr,
3300 enum uio_seg tptrseg)
3302 struct timespec ts[2];
3307 error = getutimes(tptr, tptrseg, ts);
3310 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3314 if (AUDITING_TD(td)) {
3315 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3316 AUDIT_ARG_VNODE1(fp->f_vnode);
3317 VOP_UNLOCK(fp->f_vnode);
3320 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
3326 sys_futimens(struct thread *td, struct futimens_args *uap)
3329 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
3333 kern_futimens(struct thread *td, int fd, struct timespec *tptr,
3334 enum uio_seg tptrseg)
3336 struct timespec ts[2];
3341 error = getutimens(tptr, tptrseg, ts, &flags);
3344 if (flags & UTIMENS_EXIT)
3346 error = getvnode(td, fd, &cap_futimes_rights, &fp);
3350 if (AUDITING_TD(td)) {
3351 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
3352 AUDIT_ARG_VNODE1(fp->f_vnode);
3353 VOP_UNLOCK(fp->f_vnode);
3356 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
3362 sys_utimensat(struct thread *td, struct utimensat_args *uap)
3365 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
3366 uap->times, UIO_USERSPACE, uap->flag));
3370 kern_utimensat(struct thread *td, int fd, const char *path,
3371 enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg,
3374 struct nameidata nd;
3375 struct timespec ts[2];
3378 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH |
3379 AT_EMPTY_PATH)) != 0)
3382 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
3384 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW |
3385 AT_RESOLVE_BENEATH | AT_EMPTY_PATH) | AUDITVNODE1,
3386 pathseg, path, fd, &cap_futimes_rights, td);
3387 if ((error = namei(&nd)) != 0)
3390 * We are allowed to call namei() regardless of 2xUTIME_OMIT.
3392 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
3393 * "Search permission is denied by a component of the path prefix."
3395 NDFREE_NOTHING(&nd);
3396 if ((flags & UTIMENS_EXIT) == 0)
3397 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
3403 * Truncate a file given its path name.
3405 #ifndef _SYS_SYSPROTO_H_
3406 struct truncate_args {
3413 sys_truncate(struct thread *td, struct truncate_args *uap)
3416 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3420 kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg,
3427 struct nameidata nd;
3434 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
3435 if ((error = namei(&nd)) != 0)
3438 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3439 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
3440 vn_rangelock_unlock(vp, rl_cookie);
3444 NDFREE(&nd, NDF_ONLY_PNBUF);
3445 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3446 if (vp->v_type == VDIR)
3449 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
3452 else if ((error = vn_writechk(vp)) == 0 &&
3453 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
3455 vattr.va_size = length;
3456 error = VOP_SETATTR(vp, &vattr, td->td_ucred);
3459 vn_finished_write(mp);
3460 vn_rangelock_unlock(vp, rl_cookie);
3462 if (error == ERELOOKUP)
3467 #if defined(COMPAT_43)
3469 * Truncate a file given its path name.
3471 #ifndef _SYS_SYSPROTO_H_
3472 struct otruncate_args {
3478 otruncate(struct thread *td, struct otruncate_args *uap)
3481 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3483 #endif /* COMPAT_43 */
3485 #if defined(COMPAT_FREEBSD6)
3486 /* Versions with the pad argument */
3488 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
3491 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
3495 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
3498 return (kern_ftruncate(td, uap->fd, uap->length));
3503 kern_fsync(struct thread *td, int fd, bool fullsync)
3508 int error, lock_flags;
3511 error = getvnode(td, fd, &cap_fsync_rights, &fp);
3517 /* XXXKIB: compete outstanding aio writes */;
3520 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3523 if (MNT_SHARED_WRITES(mp) ||
3524 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
3525 lock_flags = LK_SHARED;
3527 lock_flags = LK_EXCLUSIVE;
3529 vn_lock(vp, lock_flags | LK_RETRY);
3530 AUDIT_ARG_VNODE1(vp);
3531 if (vp->v_object != NULL) {
3532 VM_OBJECT_WLOCK(vp->v_object);
3533 vm_object_page_clean(vp->v_object, 0, 0, 0);
3534 VM_OBJECT_WUNLOCK(vp->v_object);
3536 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td);
3538 vn_finished_write(mp);
3539 if (error == ERELOOKUP)
3547 * Sync an open file.
3549 #ifndef _SYS_SYSPROTO_H_
3555 sys_fsync(struct thread *td, struct fsync_args *uap)
3558 return (kern_fsync(td, uap->fd, true));
3562 sys_fdatasync(struct thread *td, struct fdatasync_args *uap)
3565 return (kern_fsync(td, uap->fd, false));
3569 * Rename files. Source and destination must either both be directories, or
3570 * both not be directories. If target is a directory, it must be empty.
3572 #ifndef _SYS_SYSPROTO_H_
3573 struct rename_args {
3579 sys_rename(struct thread *td, struct rename_args *uap)
3582 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
3583 uap->to, UIO_USERSPACE));
3586 #ifndef _SYS_SYSPROTO_H_
3587 struct renameat_args {
3595 sys_renameat(struct thread *td, struct renameat_args *uap)
3598 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
3604 kern_renameat_mac(struct thread *td, int oldfd, const char *old, int newfd,
3605 const char *new, enum uio_seg pathseg, struct nameidata *fromnd)
3609 NDINIT_ATRIGHTS(fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
3610 AUDITVNODE1, pathseg, old, oldfd, &cap_renameat_source_rights, td);
3611 if ((error = namei(fromnd)) != 0)
3613 error = mac_vnode_check_rename_from(td->td_ucred, fromnd->ni_dvp,
3614 fromnd->ni_vp, &fromnd->ni_cnd);
3615 VOP_UNLOCK(fromnd->ni_dvp);
3616 if (fromnd->ni_dvp != fromnd->ni_vp)
3617 VOP_UNLOCK(fromnd->ni_vp);
3619 NDFREE(fromnd, NDF_ONLY_PNBUF);
3620 vrele(fromnd->ni_dvp);
3621 vrele(fromnd->ni_vp);
3622 if (fromnd->ni_startdir)
3623 vrele(fromnd->ni_startdir);
3630 kern_renameat(struct thread *td, int oldfd, const char *old, int newfd,
3631 const char *new, enum uio_seg pathseg)
3633 struct mount *mp = NULL;
3634 struct vnode *tvp, *fvp, *tdvp;
3635 struct nameidata fromnd, tond;
3636 u_int64_t tondflags;
3642 if (mac_vnode_check_rename_from_enabled()) {
3643 error = kern_renameat_mac(td, oldfd, old, newfd, new, pathseg,
3649 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
3650 pathseg, old, oldfd, &cap_renameat_source_rights, td);
3651 if ((error = namei(&fromnd)) != 0)
3657 tondflags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNODE2;
3658 if (fromnd.ni_vp->v_type == VDIR)
3659 tondflags |= WILLBEDIR;
3660 NDINIT_ATRIGHTS(&tond, RENAME, tondflags, pathseg, new, newfd,
3661 &cap_renameat_target_rights, td);
3662 if ((error = namei(&tond)) != 0) {
3663 /* Translate error code for rename("dir1", "dir2/."). */
3664 if (error == EISDIR && fvp->v_type == VDIR)
3666 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3667 vrele(fromnd.ni_dvp);
3673 error = vn_start_write(fvp, &mp, V_NOWAIT);
3675 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3676 NDFREE(&tond, NDF_ONLY_PNBUF);
3683 vrele(fromnd.ni_dvp);
3685 vrele(tond.ni_startdir);
3686 if (fromnd.ni_startdir != NULL)
3687 vrele(fromnd.ni_startdir);
3688 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
3694 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
3697 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
3702 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) {
3704 * If the target already exists we require CAP_UNLINKAT
3705 * from 'newfd', when newfd was used for the lookup.
3707 error = cap_check(&tond.ni_filecaps.fc_rights,
3708 &cap_unlinkat_rights);
3719 * If the source is the same as the destination (that is, if they
3720 * are links to the same vnode), then there is nothing to do.
3726 error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
3727 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
3731 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
3732 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
3733 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3734 NDFREE(&tond, NDF_ONLY_PNBUF);
3736 NDFREE(&fromnd, NDF_ONLY_PNBUF);
3737 NDFREE(&tond, NDF_ONLY_PNBUF);
3744 vrele(fromnd.ni_dvp);
3747 vrele(tond.ni_startdir);
3748 vn_finished_write(mp);
3750 if (fromnd.ni_startdir)
3751 vrele(fromnd.ni_startdir);
3752 if (error == ERESTART)
3754 if (error == ERELOOKUP)
3760 * Make a directory file.
3762 #ifndef _SYS_SYSPROTO_H_
3769 sys_mkdir(struct thread *td, struct mkdir_args *uap)
3772 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
3776 #ifndef _SYS_SYSPROTO_H_
3777 struct mkdirat_args {
3784 sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
3787 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
3791 kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg,
3796 struct nameidata nd;
3799 AUDIT_ARG_MODE(mode);
3803 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
3804 NC_NOMAKEENTRY | NC_KEEPPOSENTRY | FAILIFEXISTS | WILLBEDIR,
3805 segflg, path, fd, &cap_mkdirat_rights, td);
3806 if ((error = namei(&nd)) != 0)
3808 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3809 NDFREE(&nd, NDF_ONLY_PNBUF);
3811 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3816 vattr.va_type = VDIR;
3817 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_pd->pd_cmask;
3819 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
3824 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
3828 NDFREE(&nd, NDF_ONLY_PNBUF);
3829 VOP_VPUT_PAIR(nd.ni_dvp, error == 0 ? &nd.ni_vp : NULL, true);
3830 vn_finished_write(mp);
3831 if (error == ERELOOKUP)
3837 * Remove a directory file.
3839 #ifndef _SYS_SYSPROTO_H_
3845 sys_rmdir(struct thread *td, struct rmdir_args *uap)
3848 return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
3853 kern_frmdirat(struct thread *td, int dfd, const char *path, int fd,
3854 enum uio_seg pathseg, int flag)
3859 struct nameidata nd;
3860 cap_rights_t rights;
3864 if (fd != FD_NONE) {
3865 error = getvnode(td, fd, cap_rights_init_one(&rights,
3874 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
3875 at2cnpflags(flag, AT_RESOLVE_BENEATH),
3876 pathseg, path, dfd, &cap_unlinkat_rights, td);
3877 if ((error = namei(&nd)) != 0)
3880 if (vp->v_type != VDIR) {
3885 * No rmdir "." please.
3887 if (nd.ni_dvp == vp) {
3892 * The root of a mounted filesystem cannot be deleted.
3894 if (vp->v_vflag & VV_ROOT) {
3899 if (fp != NULL && fp->f_vnode != vp) {
3900 if (VN_IS_DOOMED(fp->f_vnode))
3908 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
3913 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
3914 NDFREE(&nd, NDF_ONLY_PNBUF);
3916 if (nd.ni_dvp == vp)
3920 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
3924 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
3925 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
3926 vn_finished_write(mp);
3928 NDFREE(&nd, NDF_ONLY_PNBUF);
3930 if (nd.ni_dvp == vp)
3934 if (error == ERELOOKUP)
3942 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
3944 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count,
3945 long *basep, void (*func)(struct freebsd11_dirent *))
3947 struct freebsd11_dirent dstdp;
3948 struct dirent *dp, *edp;
3951 ssize_t resid, ucount;
3954 /* XXX arbitrary sanity limit on `count'. */
3955 count = min(count, 64 * 1024);
3957 dirbuf = malloc(count, M_TEMP, M_WAITOK);
3959 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid,
3967 for (dp = (struct dirent *)dirbuf,
3968 edp = (struct dirent *)&dirbuf[count - resid];
3969 ucount < count && dp < edp; ) {
3970 if (dp->d_reclen == 0)
3972 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0));
3973 if (dp->d_namlen >= sizeof(dstdp.d_name))
3975 dstdp.d_type = dp->d_type;
3976 dstdp.d_namlen = dp->d_namlen;
3977 dstdp.d_fileno = dp->d_fileno; /* truncate */
3978 if (dstdp.d_fileno != dp->d_fileno) {
3979 switch (ino64_trunc_error) {
3987 dstdp.d_fileno = UINT32_MAX;
3991 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) +
3992 ((dp->d_namlen + 1 + 3) &~ 3);
3993 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
3994 bzero(dstdp.d_name + dstdp.d_namlen,
3995 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) -
3997 MPASS(dstdp.d_reclen <= dp->d_reclen);
3998 MPASS(ucount + dstdp.d_reclen <= count);
4001 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen);
4004 dp = (struct dirent *)((char *)dp + dp->d_reclen);
4005 ucount += dstdp.d_reclen;
4009 free(dirbuf, M_TEMP);
4011 td->td_retval[0] = ucount;
4018 ogetdirentries_cvt(struct freebsd11_dirent *dp)
4020 #if (BYTE_ORDER == LITTLE_ENDIAN)
4022 * The expected low byte of dp->d_namlen is our dp->d_type.
4023 * The high MBZ byte of dp->d_namlen is our dp->d_namlen.
4025 dp->d_type = dp->d_namlen;
4029 * The dp->d_type is the high byte of the expected dp->d_namlen,
4030 * so must be zero'ed.
4037 * Read a block of directory entries in a filesystem independent format.
4039 #ifndef _SYS_SYSPROTO_H_
4040 struct ogetdirentries_args {
4048 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
4053 error = kern_ogetdirentries(td, uap, &loff);
4055 error = copyout(&loff, uap->basep, sizeof(long));
4060 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
4066 /* XXX arbitrary sanity limit on `count'. */
4067 if (uap->count > 64 * 1024)
4070 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
4071 &base, ogetdirentries_cvt);
4073 if (error == 0 && uap->basep != NULL)
4074 error = copyout(&base, uap->basep, sizeof(long));
4078 #endif /* COMPAT_43 */
4080 #if defined(COMPAT_FREEBSD11)
4081 #ifndef _SYS_SYSPROTO_H_
4082 struct freebsd11_getdirentries_args {
4090 freebsd11_getdirentries(struct thread *td,
4091 struct freebsd11_getdirentries_args *uap)
4096 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
4099 if (error == 0 && uap->basep != NULL)
4100 error = copyout(&base, uap->basep, sizeof(long));
4105 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap)
4107 struct freebsd11_getdirentries_args ap;
4111 ap.count = uap->count;
4113 return (freebsd11_getdirentries(td, &ap));
4115 #endif /* COMPAT_FREEBSD11 */
4118 * Read a block of directory entries in a filesystem independent format.
4121 sys_getdirentries(struct thread *td, struct getdirentries_args *uap)
4126 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
4127 NULL, UIO_USERSPACE);
4130 if (uap->basep != NULL)
4131 error = copyout(&base, uap->basep, sizeof(off_t));
4136 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count,
4137 off_t *basep, ssize_t *residp, enum uio_seg bufseg)
4148 if (count > IOSIZE_MAX)
4150 auio.uio_resid = count;
4151 error = getvnode(td, fd, &cap_read_rights, &fp);
4154 if ((fp->f_flag & FREAD) == 0) {
4159 foffset = foffset_lock(fp, 0);
4161 if (vp->v_type != VDIR) {
4165 aiov.iov_base = buf;
4166 aiov.iov_len = count;
4167 auio.uio_iov = &aiov;
4168 auio.uio_iovcnt = 1;
4169 auio.uio_rw = UIO_READ;
4170 auio.uio_segflg = bufseg;
4172 vn_lock(vp, LK_SHARED | LK_RETRY);
4173 AUDIT_ARG_VNODE1(vp);
4174 loff = auio.uio_offset = foffset;
4176 error = mac_vnode_check_readdir(td->td_ucred, vp);
4179 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
4181 foffset = auio.uio_offset;
4186 if (count == auio.uio_resid &&
4187 (vp->v_vflag & VV_ROOT) &&
4188 (vp->v_mount->mnt_flag & MNT_UNION)) {
4189 struct vnode *tvp = vp;
4191 vp = vp->v_mount->mnt_vnodecovered;
4201 *residp = auio.uio_resid;
4202 td->td_retval[0] = count - auio.uio_resid;
4204 foffset_unlock(fp, foffset, 0);
4210 * Set the mode mask for creation of filesystem nodes.
4212 #ifndef _SYS_SYSPROTO_H_
4218 sys_umask(struct thread *td, struct umask_args *uap)
4220 struct pwddesc *pdp;
4222 pdp = td->td_proc->p_pd;
4224 td->td_retval[0] = pdp->pd_cmask;
4225 pdp->pd_cmask = uap->newmask & ALLPERMS;
4226 PWDDESC_XUNLOCK(pdp);
4231 * Void all references to file by ripping underlying filesystem away from
4234 #ifndef _SYS_SYSPROTO_H_
4235 struct revoke_args {
4240 sys_revoke(struct thread *td, struct revoke_args *uap)
4244 struct nameidata nd;
4247 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
4249 if ((error = namei(&nd)) != 0)
4252 NDFREE_NOTHING(&nd);
4253 if (vp->v_type != VCHR || vp->v_rdev == NULL) {
4258 error = mac_vnode_check_revoke(td->td_ucred, vp);
4262 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
4265 if (td->td_ucred->cr_uid != vattr.va_uid) {
4266 error = priv_check(td, PRIV_VFS_ADMIN);
4270 if (devfs_usecount(vp) > 0)
4271 VOP_REVOKE(vp, REVOKEALL);
4278 * This variant of getvnode() allows O_PATH files. Caller should
4279 * ensure that returned file and vnode are only used for compatible
4283 getvnode_path(struct thread *td, int fd, cap_rights_t *rightsp,
4289 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp);
4294 * The file could be not of the vnode type, or it may be not
4295 * yet fully initialized, in which case the f_vnode pointer
4296 * may be set, but f_ops is still badfileops. E.g.,
4297 * devfs_open() transiently create such situation to
4298 * facilitate csw d_fdopen().
4300 * Dupfdopen() handling in kern_openat() installs the
4301 * half-baked file into the process descriptor table, allowing
4302 * other thread to dereference it. Guard against the race by
4305 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
4315 * Convert a user file descriptor to a kernel file entry and check
4316 * that, if it is a capability, the correct rights are present.
4317 * A reference on the file entry is held upon returning.
4320 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
4324 error = getvnode_path(td, fd, rightsp, fpp);
4327 * Filter out O_PATH file descriptors, most getvnode() callers
4328 * do not call fo_ methods.
4330 if (error == 0 && (*fpp)->f_ops == &path_fileops) {
4339 * Get an (NFS) file handle.
4341 #ifndef _SYS_SYSPROTO_H_
4342 struct lgetfh_args {
4348 sys_lgetfh(struct thread *td, struct lgetfh_args *uap)
4351 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname,
4352 UIO_USERSPACE, uap->fhp, UIO_USERSPACE));
4355 #ifndef _SYS_SYSPROTO_H_
4362 sys_getfh(struct thread *td, struct getfh_args *uap)
4365 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE,
4366 uap->fhp, UIO_USERSPACE));
4370 * syscall for the rpc.lockd to use to translate an open descriptor into
4371 * a NFS file handle.
4373 * warning: do not remove the priv_check() call or this becomes one giant
4376 #ifndef _SYS_SYSPROTO_H_
4377 struct getfhat_args {
4385 sys_getfhat(struct thread *td, struct getfhat_args *uap)
4388 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0)
4390 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE,
4391 uap->fhp, UIO_USERSPACE));
4395 kern_getfhat(struct thread *td, int flags, int fd, const char *path,
4396 enum uio_seg pathseg, fhandle_t *fhp, enum uio_seg fhseg)
4398 struct nameidata nd;
4403 error = priv_check(td, PRIV_VFS_GETFH);
4406 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW |
4407 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path,
4412 NDFREE_NOTHING(&nd);
4414 bzero(&fh, sizeof(fh));
4415 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
4416 error = VOP_VPTOFH(vp, &fh.fh_fid);
4419 if (fhseg == UIO_USERSPACE)
4420 error = copyout(&fh, fhp, sizeof (fh));
4422 memcpy(fhp, &fh, sizeof(fh));
4427 #ifndef _SYS_SYSPROTO_H_
4428 struct fhlink_args {
4434 sys_fhlink(struct thread *td, struct fhlink_args *uap)
4437 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp));
4440 #ifndef _SYS_SYSPROTO_H_
4441 struct fhlinkat_args {
4448 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap)
4451 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp));
4455 kern_fhlinkat(struct thread *td, int fd, const char *path,
4456 enum uio_seg pathseg, fhandle_t *fhp)
4463 error = priv_check(td, PRIV_VFS_GETFH);
4466 error = copyin(fhp, &fh, sizeof(fh));
4471 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4473 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4478 error = kern_linkat_vp(td, vp, fd, path, pathseg);
4479 } while (error == EAGAIN || error == ERELOOKUP);
4483 #ifndef _SYS_SYSPROTO_H_
4484 struct fhreadlink_args {
4491 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap)
4498 error = priv_check(td, PRIV_VFS_GETFH);
4501 if (uap->bufsize > IOSIZE_MAX)
4503 error = copyin(uap->fhp, &fh, sizeof(fh));
4506 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4508 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
4512 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td);
4518 * syscall for the rpc.lockd to use to translate a NFS file handle into an
4521 * warning: do not remove the priv_check() call or this becomes one giant
4524 #ifndef _SYS_SYSPROTO_H_
4525 struct fhopen_args {
4526 const struct fhandle *u_fhp;
4531 sys_fhopen(struct thread *td, struct fhopen_args *uap)
4533 return (kern_fhopen(td, uap->u_fhp, uap->flags));
4537 kern_fhopen(struct thread *td, const struct fhandle *u_fhp, int flags)
4546 error = priv_check(td, PRIV_VFS_FHOPEN);
4550 fmode = FFLAGS(flags);
4551 /* why not allow a non-read/write open for our lockd? */
4552 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
4554 error = copyin(u_fhp, &fhp, sizeof(fhp));
4557 /* find the mount point */
4558 mp = vfs_busyfs(&fhp.fh_fsid);
4561 /* now give me my vnode, it gets returned to me locked */
4562 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
4567 error = falloc_noinstall(td, &fp);
4573 * An extra reference on `fp' has been held for us by
4574 * falloc_noinstall().
4580 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
4582 KASSERT(fp->f_ops == &badfileops,
4583 ("VOP_OPEN in fhopen() set f_ops"));
4584 KASSERT(td->td_dupfd < 0,
4585 ("fhopen() encountered fdopen()"));
4594 finit_vnode(fp, fmode, NULL, &vnops);
4596 if ((fmode & O_TRUNC) != 0) {
4597 error = fo_truncate(fp, 0, td->td_ucred, td);
4602 error = finstall(td, fp, &indx, fmode, NULL);
4605 td->td_retval[0] = indx;
4610 * Stat an (NFS) file handle.
4612 #ifndef _SYS_SYSPROTO_H_
4613 struct fhstat_args {
4614 struct fhandle *u_fhp;
4619 sys_fhstat(struct thread *td, struct fhstat_args *uap)
4625 error = copyin(uap->u_fhp, &fh, sizeof(fh));
4628 error = kern_fhstat(td, fh, &sb);
4630 error = copyout(&sb, uap->sb, sizeof(sb));
4635 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
4641 error = priv_check(td, PRIV_VFS_FHSTAT);
4644 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4646 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4650 error = VOP_STAT(vp, sb, td->td_ucred, NOCRED, td);
4656 * Implement fstatfs() for (NFS) file handles.
4658 #ifndef _SYS_SYSPROTO_H_
4659 struct fhstatfs_args {
4660 struct fhandle *u_fhp;
4665 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap)
4671 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
4674 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
4675 error = kern_fhstatfs(td, fh, sfp);
4677 error = copyout(sfp, uap->buf, sizeof(*sfp));
4678 free(sfp, M_STATFS);
4683 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
4689 error = priv_check(td, PRIV_VFS_FHSTATFS);
4692 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
4694 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
4700 error = prison_canseemount(td->td_ucred, mp);
4704 error = mac_mount_check_stat(td->td_ucred, mp);
4708 error = VFS_STATFS(mp, buf);
4715 * Unlike madvise(2), we do not make a best effort to remember every
4716 * possible caching hint. Instead, we remember the last setting with
4717 * the exception that we will allow POSIX_FADV_NORMAL to adjust the
4718 * region of any current setting.
4721 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
4724 struct fadvise_info *fa, *new;
4730 if (offset < 0 || len < 0 || offset > OFF_MAX - len)
4732 AUDIT_ARG_VALUE(advice);
4734 case POSIX_FADV_SEQUENTIAL:
4735 case POSIX_FADV_RANDOM:
4736 case POSIX_FADV_NOREUSE:
4737 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
4739 case POSIX_FADV_NORMAL:
4740 case POSIX_FADV_WILLNEED:
4741 case POSIX_FADV_DONTNEED:
4747 /* XXX: CAP_POSIX_FADVISE? */
4749 error = fget(td, fd, &cap_no_rights, &fp);
4752 AUDIT_ARG_FILE(td->td_proc, fp);
4753 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
4757 if (fp->f_type != DTYPE_VNODE) {
4762 if (vp->v_type != VREG) {
4769 end = offset + len - 1;
4771 case POSIX_FADV_SEQUENTIAL:
4772 case POSIX_FADV_RANDOM:
4773 case POSIX_FADV_NOREUSE:
4775 * Try to merge any existing non-standard region with
4776 * this new region if possible, otherwise create a new
4777 * non-standard region for this request.
4779 mtx_pool_lock(mtxpool_sleep, fp);
4781 if (fa != NULL && fa->fa_advice == advice &&
4782 ((fa->fa_start <= end && fa->fa_end >= offset) ||
4783 (end != OFF_MAX && fa->fa_start == end + 1) ||
4784 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
4785 if (offset < fa->fa_start)
4786 fa->fa_start = offset;
4787 if (end > fa->fa_end)
4790 new->fa_advice = advice;
4791 new->fa_start = offset;
4796 mtx_pool_unlock(mtxpool_sleep, fp);
4798 case POSIX_FADV_NORMAL:
4800 * If a the "normal" region overlaps with an existing
4801 * non-standard region, trim or remove the
4802 * non-standard region.
4804 mtx_pool_lock(mtxpool_sleep, fp);
4807 if (offset <= fa->fa_start && end >= fa->fa_end) {
4809 fp->f_advice = NULL;
4810 } else if (offset <= fa->fa_start &&
4811 end >= fa->fa_start)
4812 fa->fa_start = end + 1;
4813 else if (offset <= fa->fa_end && end >= fa->fa_end)
4814 fa->fa_end = offset - 1;
4815 else if (offset >= fa->fa_start && end <= fa->fa_end) {
4817 * If the "normal" region is a middle
4818 * portion of the existing
4819 * non-standard region, just remove
4820 * the whole thing rather than picking
4821 * one side or the other to
4825 fp->f_advice = NULL;
4828 mtx_pool_unlock(mtxpool_sleep, fp);
4830 case POSIX_FADV_WILLNEED:
4831 case POSIX_FADV_DONTNEED:
4832 error = VOP_ADVISE(vp, offset, end, advice);
4838 free(new, M_FADVISE);
4843 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
4847 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
4849 return (kern_posix_error(td, error));
4853 kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd,
4854 off_t *outoffp, size_t len, unsigned int flags)
4856 struct file *infp, *outfp;
4857 struct vnode *invp, *outvp;
4860 void *rl_rcookie, *rl_wcookie;
4861 off_t savinoff, savoutoff;
4863 infp = outfp = NULL;
4864 rl_rcookie = rl_wcookie = NULL;
4873 if (len > SSIZE_MAX)
4875 * Although the len argument is size_t, the return argument
4876 * is ssize_t (which is signed). Therefore a size that won't
4877 * fit in ssize_t can't be returned.
4881 /* Get the file structures for the file descriptors. */
4882 error = fget_read(td, infd, &cap_read_rights, &infp);
4885 if (infp->f_ops == &badfileops) {
4889 if (infp->f_vnode == NULL) {
4893 error = fget_write(td, outfd, &cap_write_rights, &outfp);
4896 if (outfp->f_ops == &badfileops) {
4900 if (outfp->f_vnode == NULL) {
4905 /* Set the offset pointers to the correct place. */
4907 inoffp = &infp->f_offset;
4908 if (outoffp == NULL)
4909 outoffp = &outfp->f_offset;
4911 savoutoff = *outoffp;
4913 invp = infp->f_vnode;
4914 outvp = outfp->f_vnode;
4915 /* Sanity check the f_flag bits. */
4916 if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE ||
4917 (infp->f_flag & FREAD) == 0) {
4922 /* If len == 0, just return 0. */
4927 * If infp and outfp refer to the same file, the byte ranges cannot
4930 if (invp == outvp && ((savinoff <= savoutoff && savinoff + len >
4931 savoutoff) || (savinoff > savoutoff && savoutoff + len >
4937 /* Range lock the byte ranges for both invp and outvp. */
4939 rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp +
4941 rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp +
4943 if (rl_rcookie != NULL)
4945 vn_rangelock_unlock(outvp, rl_wcookie);
4946 rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len);
4947 vn_rangelock_unlock(invp, rl_rcookie);
4951 error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen,
4952 flags, infp->f_cred, outfp->f_cred, td);
4954 if (rl_rcookie != NULL)
4955 vn_rangelock_unlock(invp, rl_rcookie);
4956 if (rl_wcookie != NULL)
4957 vn_rangelock_unlock(outvp, rl_wcookie);
4958 if (savinoff != -1 && (error == EINTR || error == ERESTART)) {
4960 *outoffp = savoutoff;
4966 td->td_retval[0] = retlen;
4971 sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap)
4973 off_t inoff, outoff, *inoffp, *outoffp;
4976 inoffp = outoffp = NULL;
4977 if (uap->inoffp != NULL) {
4978 error = copyin(uap->inoffp, &inoff, sizeof(off_t));
4983 if (uap->outoffp != NULL) {
4984 error = copyin(uap->outoffp, &outoff, sizeof(off_t));
4989 error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd,
4990 outoffp, uap->len, uap->flags);
4991 if (error == 0 && uap->inoffp != NULL)
4992 error = copyout(inoffp, uap->inoffp, sizeof(off_t));
4993 if (error == 0 && uap->outoffp != NULL)
4994 error = copyout(outoffp, uap->outoffp, sizeof(off_t));