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vfs_syscalls.c
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/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: stable/11/sys/kern/vfs_syscalls.c 338987 2018-09-27 18:54:41Z gordon $");
#include "opt_capsicum.h"
#include "opt_compat.h"
#include "opt_ktrace.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/capsicum.h>
#include <sys/disk.h>
#include <sys/sysent.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/sysproto.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filio.h>
#include <sys/limits.h>
#include <sys/linker.h>
#include <sys/rwlock.h>
#include <sys/sdt.h>
#include <sys/stat.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/jail.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <machine/stdarg.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/uma.h>
#include <ufs/ufs/quota.h>
MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
SDT_PROVIDER_DEFINE(vfs);
SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int");
SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int");
static int kern_chflagsat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, u_long flags, int atflag);
static int setfflags(struct thread *td, struct vnode *, u_long);
static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
static int getutimens(const struct timespec *, enum uio_seg,
struct timespec *, int *);
static int setutimes(struct thread *td, struct vnode *,
const struct timespec *, int, int);
static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
struct thread *td);
/*
* Sync each mounted filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct sync_args {
int dummy;
};
#endif
/* ARGSUSED */
int
sys_sync(struct thread *td, struct sync_args *uap)
{
struct mount *mp, *nmp;
int save;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
save = curthread_pflags_set(TDP_SYNCIO);
vfs_msync(mp, MNT_NOWAIT);
VFS_SYNC(mp, MNT_NOWAIT);
curthread_pflags_restore(save);
vn_finished_write(mp);
}
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp);
}
mtx_unlock(&mountlist_mtx);
return (0);
}
/*
* Change filesystem quotas.
*/
#ifndef _SYS_SYSPROTO_H_
struct quotactl_args {
char *path;
int cmd;
int uid;
caddr_t arg;
};
#endif
int
sys_quotactl(struct thread *td, struct quotactl_args *uap)
{
struct mount *mp;
struct nameidata nd;
int error;
AUDIT_ARG_CMD(uap->cmd);
AUDIT_ARG_UID(uap->uid);
if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS))
return (EPERM);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
mp = nd.ni_vp->v_mount;
vfs_ref(mp);
vput(nd.ni_vp);
error = vfs_busy(mp, 0);
vfs_rel(mp);
if (error != 0)
return (error);
error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
/*
* Since quota on operation typically needs to open quota
* file, the Q_QUOTAON handler needs to unbusy the mount point
* before calling into namei. Otherwise, unmount might be
* started between two vfs_busy() invocations (first is our,
* second is from mount point cross-walk code in lookup()),
* causing deadlock.
*
* Require that Q_QUOTAON handles the vfs_busy() reference on
* its own, always returning with ubusied mount point.
*/
if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON &&
(uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF)
vfs_unbusy(mp);
return (error);
}
/*
* Used by statfs conversion routines to scale the block size up if
* necessary so that all of the block counts are <= 'max_size'. Note
* that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero
* value of 'n'.
*/
void
statfs_scale_blocks(struct statfs *sf, long max_size)
{
uint64_t count;
int shift;
KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__));
/*
* Attempt to scale the block counts to give a more accurate
* overview to userland of the ratio of free space to used
* space. To do this, find the largest block count and compute
* a divisor that lets it fit into a signed integer <= max_size.
*/
if (sf->f_bavail < 0)
count = -sf->f_bavail;
else
count = sf->f_bavail;
count = MAX(sf->f_blocks, MAX(sf->f_bfree, count));
if (count <= max_size)
return;
count >>= flsl(max_size);
shift = 0;
while (count > 0) {
shift++;
count >>=1;
}
sf->f_bsize <<= shift;
sf->f_blocks >>= shift;
sf->f_bfree >>= shift;
sf->f_bavail >>= shift;
}
static int
kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf)
{
struct statfs *sp;
int error;
if (mp == NULL)
return (EBADF);
error = vfs_busy(mp, 0);
vfs_rel(mp);
if (error != 0)
return (error);
#ifdef MAC
error = mac_mount_check_stat(td->td_ucred, mp);
if (error != 0)
goto out;
#endif
/*
* Set these in case the underlying filesystem fails to do so.
*/
sp = &mp->mnt_stat;
sp->f_version = STATFS_VERSION;
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = VFS_STATFS(mp, sp);
if (error != 0)
goto out;
*buf = *sp;
if (priv_check(td, PRIV_VFS_GENERATION)) {
buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
prison_enforce_statfs(td->td_ucred, mp, buf);
}
out:
vfs_unbusy(mp);
return (error);
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct statfs_args {
char *path;
struct statfs *buf;
};
#endif
int
sys_statfs(struct thread *td, struct statfs_args *uap)
{
struct statfs *sfp;
int error;
sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
if (error == 0)
error = copyout(sfp, uap->buf, sizeof(struct statfs));
free(sfp, M_STATFS);
return (error);
}
int
kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
struct statfs *buf)
{
struct mount *mp;
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
pathseg, path, td);
error = namei(&nd);
if (error != 0)
return (error);
mp = nd.ni_vp->v_mount;
vfs_ref(mp);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_vp);
return (kern_do_statfs(td, mp, buf));
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct fstatfs_args {
int fd;
struct statfs *buf;
};
#endif
int
sys_fstatfs(struct thread *td, struct fstatfs_args *uap)
{
struct statfs *sfp;
int error;
sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_fstatfs(td, uap->fd, sfp);
if (error == 0)
error = copyout(sfp, uap->buf, sizeof(struct statfs));
free(sfp, M_STATFS);
return (error);
}
int
kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
{
struct file *fp;
struct mount *mp;
struct vnode *vp;
cap_rights_t rights;
int error;
AUDIT_ARG_FD(fd);
error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSTATFS), &fp);
if (error != 0)
return (error);
vp = fp->f_vnode;
vn_lock(vp, LK_SHARED | LK_RETRY);
#ifdef AUDIT
AUDIT_ARG_VNODE1(vp);
#endif
mp = vp->v_mount;
if (mp != NULL)
vfs_ref(mp);
VOP_UNLOCK(vp, 0);
fdrop(fp, td);
return (kern_do_statfs(td, mp, buf));
}
/*
* Get statistics on all filesystems.
*/
#ifndef _SYS_SYSPROTO_H_
struct getfsstat_args {
struct statfs *buf;
long bufsize;
int mode;
};
#endif
int
sys_getfsstat(struct thread *td, struct getfsstat_args *uap)
{
size_t count;
int error;
if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX)
return (EINVAL);
error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count,
UIO_USERSPACE, uap->mode);
if (error == 0)
td->td_retval[0] = count;
return (error);
}
/*
* If (bufsize > 0 && bufseg == UIO_SYSSPACE)
* The caller is responsible for freeing memory which will be allocated
* in '*buf'.
*/
int
kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
size_t *countp, enum uio_seg bufseg, int mode)
{
struct mount *mp, *nmp;
struct statfs *sfsp, *sp, *sptmp, *tofree;
size_t count, maxcount;
int error;
switch (mode) {
case MNT_WAIT:
case MNT_NOWAIT:
break;
default:
return (EINVAL);
}
restart:
maxcount = bufsize / sizeof(struct statfs);
if (bufsize == 0) {
sfsp = NULL;
tofree = NULL;
} else if (bufseg == UIO_USERSPACE) {
sfsp = *buf;
tofree = NULL;
} else /* if (bufseg == UIO_SYSSPACE) */ {
count = 0;
mtx_lock(&mountlist_mtx);
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
count++;
}
mtx_unlock(&mountlist_mtx);
if (maxcount > count)
maxcount = count;
tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs),
M_STATFS, M_WAITOK);
}
count = 0;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (prison_canseemount(td->td_ucred, mp) != 0) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
#ifdef MAC
if (mac_mount_check_stat(td->td_ucred, mp) != 0) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
#endif
if (mode == MNT_WAIT) {
if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) {
/*
* If vfs_busy() failed, and MBF_NOWAIT
* wasn't passed, then the mp is gone.
* Furthermore, because of MBF_MNTLSTLOCK,
* the mountlist_mtx was dropped. We have
* no other choice than to start over.
*/
mtx_unlock(&mountlist_mtx);
free(tofree, M_STATFS);
goto restart;
}
} else {
if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
}
if (sfsp != NULL && count < maxcount) {
sp = &mp->mnt_stat;
/*
* Set these in case the underlying filesystem
* fails to do so.
*/
sp->f_version = STATFS_VERSION;
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
/*
* If MNT_NOWAIT is specified, do not refresh
* the fsstat cache.
*/
if (mode != MNT_NOWAIT) {
error = VFS_STATFS(mp, sp);
if (error != 0) {
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp);
continue;
}
}
if (priv_check(td, PRIV_VFS_GENERATION)) {
sptmp = malloc(sizeof(struct statfs), M_STATFS,
M_WAITOK);
*sptmp = *sp;
sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0;
prison_enforce_statfs(td->td_ucred, mp, sptmp);
sp = sptmp;
} else
sptmp = NULL;
if (bufseg == UIO_SYSSPACE) {
bcopy(sp, sfsp, sizeof(*sp));
free(sptmp, M_STATFS);
} else /* if (bufseg == UIO_USERSPACE) */ {
error = copyout(sp, sfsp, sizeof(*sp));
free(sptmp, M_STATFS);
if (error != 0) {
vfs_unbusy(mp);
return (error);
}
}
sfsp++;
}
count++;
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp);
}
mtx_unlock(&mountlist_mtx);
if (sfsp != NULL && count > maxcount)
*countp = maxcount;
else
*countp = count;
return (0);
}
#ifdef COMPAT_FREEBSD4
/*
* Get old format filesystem statistics.
*/
static void cvtstatfs(struct statfs *, struct ostatfs *);
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_statfs_args {
char *path;
struct ostatfs *buf;
};
#endif
int
freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap)
{
struct ostatfs osb;
struct statfs *sfp;
int error;
sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp);
if (error == 0) {
cvtstatfs(sfp, &osb);
error = copyout(&osb, uap->buf, sizeof(osb));
}
free(sfp, M_STATFS);
return (error);
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_fstatfs_args {
int fd;
struct ostatfs *buf;
};
#endif
int
freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap)
{
struct ostatfs osb;
struct statfs *sfp;
int error;
sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_fstatfs(td, uap->fd, sfp);
if (error == 0) {
cvtstatfs(sfp, &osb);
error = copyout(&osb, uap->buf, sizeof(osb));
}
free(sfp, M_STATFS);
return (error);
}
/*
* Get statistics on all filesystems.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_getfsstat_args {
struct ostatfs *buf;
long bufsize;
int mode;
};
#endif
int
freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap)
{
struct statfs *buf, *sp;
struct ostatfs osb;
size_t count, size;
int error;
if (uap->bufsize < 0)
return (EINVAL);
count = uap->bufsize / sizeof(struct ostatfs);
if (count > SIZE_MAX / sizeof(struct statfs))
return (EINVAL);
size = count * sizeof(struct statfs);
error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
uap->mode);
if (buf == NULL)
return (EINVAL);
td->td_retval[0] = count;
if (size != 0) {
sp = buf;
while (count != 0 && error == 0) {
cvtstatfs(sp, &osb);
error = copyout(&osb, uap->buf, sizeof(osb));
sp++;
uap->buf++;
count--;
}
free(buf, M_STATFS);
}
return (error);
}
/*
* Implement fstatfs() for (NFS) file handles.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd4_fhstatfs_args {
struct fhandle *u_fhp;
struct ostatfs *buf;
};
#endif
int
freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap)
{
struct ostatfs osb;
struct statfs *sfp;
fhandle_t fh;
int error;
error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
if (error != 0)
return (error);
sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_fhstatfs(td, fh, sfp);
if (error == 0) {
cvtstatfs(sfp, &osb);
error = copyout(&osb, uap->buf, sizeof(osb));
}
free(sfp, M_STATFS);
return (error);
}
/*
* Convert a new format statfs structure to an old format statfs structure.
*/
static void
cvtstatfs(struct statfs *nsp, struct ostatfs *osp)
{
statfs_scale_blocks(nsp, LONG_MAX);
bzero(osp, sizeof(*osp));
osp->f_bsize = nsp->f_bsize;
osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX);
osp->f_blocks = nsp->f_blocks;
osp->f_bfree = nsp->f_bfree;
osp->f_bavail = nsp->f_bavail;
osp->f_files = MIN(nsp->f_files, LONG_MAX);
osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX);
osp->f_owner = nsp->f_owner;
osp->f_type = nsp->f_type;
osp->f_flags = nsp->f_flags;
osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX);
osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX);
osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX);
osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX);
strlcpy(osp->f_fstypename, nsp->f_fstypename,
MIN(MFSNAMELEN, OMFSNAMELEN));
strlcpy(osp->f_mntonname, nsp->f_mntonname,
MIN(MNAMELEN, OMNAMELEN));
strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
MIN(MNAMELEN, OMNAMELEN));
osp->f_fsid = nsp->f_fsid;
}
#endif /* COMPAT_FREEBSD4 */
/*
* Change current working directory to a given file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchdir_args {
int fd;
};
#endif
int
sys_fchdir(struct thread *td, struct fchdir_args *uap)
{
struct vnode *vp, *tdp;
struct mount *mp;
struct file *fp;
cap_rights_t rights;
int error;
AUDIT_ARG_FD(uap->fd);
error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHDIR),
&fp);
if (error != 0)
return (error);
vp = fp->f_vnode;
vrefact(vp);
fdrop(fp, td);
vn_lock(vp, LK_SHARED | LK_RETRY);
AUDIT_ARG_VNODE1(vp);
error = change_dir(vp, td);
while (!error && (mp = vp->v_mountedhere) != NULL) {
if (vfs_busy(mp, 0))
continue;
error = VFS_ROOT(mp, LK_SHARED, &tdp);
vfs_unbusy(mp);
if (error != 0)
break;
vput(vp);
vp = tdp;
}
if (error != 0) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, 0);
pwd_chdir(td, vp);
return (0);
}
/*
* Change current working directory (``.'').
*/
#ifndef _SYS_SYSPROTO_H_
struct chdir_args {
char *path;
};
#endif
int
sys_chdir(struct thread *td, struct chdir_args *uap)
{
return (kern_chdir(td, uap->path, UIO_USERSPACE));
}
int
kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
{
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
if ((error = change_dir(nd.ni_vp, td)) != 0) {
vput(nd.ni_vp);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
VOP_UNLOCK(nd.ni_vp, 0);
NDFREE(&nd, NDF_ONLY_PNBUF);
pwd_chdir(td, nd.ni_vp);
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
#ifndef _SYS_SYSPROTO_H_
struct chroot_args {
char *path;
};
#endif
int
sys_chroot(struct thread *td, struct chroot_args *uap)
{
struct nameidata nd;
int error;
error = priv_check(td, PRIV_VFS_CHROOT);
if (error != 0)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error != 0)
goto error;
error = change_dir(nd.ni_vp, td);
if (error != 0)
goto e_vunlock;
#ifdef MAC
error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp);
if (error != 0)
goto e_vunlock;
#endif
VOP_UNLOCK(nd.ni_vp, 0);
error = pwd_chroot(td, nd.ni_vp);
vrele(nd.ni_vp);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
e_vunlock:
vput(nd.ni_vp);
error:
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
/*
* Common routine for chroot and chdir. Callers must provide a locked vnode
* instance.
*/
int
change_dir(struct vnode *vp, struct thread *td)
{
#ifdef MAC
int error;
#endif
ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked");
if (vp->v_type != VDIR)
return (ENOTDIR);
#ifdef MAC
error = mac_vnode_check_chdir(td->td_ucred, vp);
if (error != 0)
return (error);
#endif
return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td));
}
static __inline void
flags_to_rights(int flags, cap_rights_t *rightsp)
{
if (flags & O_EXEC) {
cap_rights_set(rightsp, CAP_FEXECVE);
} else {
switch ((flags & O_ACCMODE)) {
case O_RDONLY:
cap_rights_set(rightsp, CAP_READ);
break;
case O_RDWR:
cap_rights_set(rightsp, CAP_READ);
/* FALLTHROUGH */
case O_WRONLY:
cap_rights_set(rightsp, CAP_WRITE);
if (!(flags & (O_APPEND | O_TRUNC)))
cap_rights_set(rightsp, CAP_SEEK);
break;
}
}
if (flags & O_CREAT)
cap_rights_set(rightsp, CAP_CREATE);
if (flags & O_TRUNC)
cap_rights_set(rightsp, CAP_FTRUNCATE);
if (flags & (O_SYNC | O_FSYNC))
cap_rights_set(rightsp, CAP_FSYNC);
if (flags & (O_EXLOCK | O_SHLOCK))
cap_rights_set(rightsp, CAP_FLOCK);
}
/*
* Check permissions, allocate an open file structure, and call the device
* open routine if any.
*/
#ifndef _SYS_SYSPROTO_H_
struct open_args {
char *path;
int flags;
int mode;
};
#endif
int
sys_open(struct thread *td, struct open_args *uap)
{
return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->flags, uap->mode));
}
#ifndef _SYS_SYSPROTO_H_
struct openat_args {
int fd;
char *path;
int flag;
int mode;
};
#endif
int
sys_openat(struct thread *td, struct openat_args *uap)
{
AUDIT_ARG_FD(uap->fd);
return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
uap->mode));
}
int
kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
int flags, int mode)
{
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
struct nameidata nd;
cap_rights_t rights;
int cmode, error, indx;
indx = -1;
AUDIT_ARG_FFLAGS(flags);
AUDIT_ARG_MODE(mode);
cap_rights_init(&rights, CAP_LOOKUP);
flags_to_rights(flags, &rights);
/*
* Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
* may be specified.
*/
if (flags & O_EXEC) {
if (flags & O_ACCMODE)
return (EINVAL);
} else if ((flags & O_ACCMODE) == O_ACCMODE) {
return (EINVAL);
} else {
flags = FFLAGS(flags);
}
/*
* Allocate a file structure. The descriptor to reference it
* is allocated and set by finstall() below.
*/
error = falloc_noinstall(td, &fp);
if (error != 0)
return (error);
/*
* An extra reference on `fp' has been held for us by
* falloc_noinstall().
*/
/* Set the flags early so the finit in devfs can pick them up. */
fp->f_flag = flags & FMASK;
cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
&rights, td);
td->td_dupfd = -1; /* XXX check for fdopen */
error = vn_open(&nd, &flags, cmode, fp);
if (error != 0) {
/*
* If the vn_open replaced the method vector, something
* wonderous happened deep below and we just pass it up
* pretending we know what we do.
*/
if (error == ENXIO && fp->f_ops != &badfileops)
goto success;
/*
* Handle special fdopen() case. bleh.
*
* Don't do this for relative (capability) lookups; we don't
* understand exactly what would happen, and we don't think
* that it ever should.
*/
if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 &&
(error == ENODEV || error == ENXIO) &&
td->td_dupfd >= 0) {
error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
&indx);
if (error == 0)
goto success;
}
goto bad;
}
td->td_dupfd = 0;
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
/*
* Store the vnode, for any f_type. Typically, the vnode use
* count is decremented by direct call to vn_closefile() for
* files that switched type in the cdevsw fdopen() method.
*/
fp->f_vnode = vp;
/*
* If the file wasn't claimed by devfs bind it to the normal
* vnode operations here.
*/
if (fp->f_ops == &badfileops) {
KASSERT(vp->v_type != VFIFO, ("Unexpected fifo."));
fp->f_seqcount = 1;
finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK),
DTYPE_VNODE, vp, &vnops);
}
VOP_UNLOCK(vp, 0);
if (flags & O_TRUNC) {