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freebsd-skq/sys/kern/vfs_syscalls.c
kevans 89798a71d4 posix_fallocate: push vnop implementation into the fileop layer 
This opens the door for other descriptor types to implement
posix_fallocate(2) as needed.

Reviewed by:	kib, bcr (manpages)
Differential Revision:	https://reviews.freebsd.org/D23042
2020-01-08 19:05:32 +00:00

4835 lines
105 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
* 3. 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("$FreeBSD$");
#include "opt_capsicum.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);
static int kern_fhlinkat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, fhandle_t *fhp);
static int kern_getfhat(struct thread *td, int flags, int fd,
const char *path, enum uio_seg pathseg, fhandle_t *fhp);
static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg,
size_t count, struct thread *td);
static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd,
const char *path, enum uio_seg segflag);
int
kern_sync(struct thread *td)
{
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_periodic(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);
}
/*
* 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)
{
return (kern_sync(td));
}
/*
* 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)
{
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
error = VFS_STATFS(mp, buf);
if (error != 0)
goto out;
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, const 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;
int error;
AUDIT_ARG_FD(fd);
error = getvnode(td, fd, &cap_fstatfs_rights, &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);
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:
if (bufseg == UIO_SYSSPACE)
*buf = NULL;
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;
/*
* 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 freebsd4_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) {
freebsd4_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) {
freebsd4_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 (error == 0)
td->td_retval[0] = count;
if (size != 0) {
sp = buf;
while (count != 0 && error == 0) {
freebsd4_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) {
freebsd4_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
freebsd4_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 */
#if defined(COMPAT_FREEBSD11)
/*
* Get old format filesystem statistics.
*/
static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *);
int
freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap)
{
struct freebsd11_statfs 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) {
freebsd11_cvtstatfs(sfp, &osb);
error = copyout(&osb, uap->buf, sizeof(osb));
}
free(sfp, M_STATFS);
return (error);
}
/*
* Get filesystem statistics.
*/
int
freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap)
{
struct freebsd11_statfs 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) {
freebsd11_cvtstatfs(sfp, &osb);
error = copyout(&osb, uap->buf, sizeof(osb));
}
free(sfp, M_STATFS);
return (error);
}
/*
* Get statistics on all filesystems.
*/
int
freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap)
{
struct freebsd11_statfs osb;
struct statfs *buf, *sp;
size_t count, size;
int error;
count = uap->bufsize / sizeof(struct ostatfs);
size = count * sizeof(struct statfs);
error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
uap->mode);
if (error == 0)
td->td_retval[0] = count;
if (size > 0) {
sp = buf;
while (count > 0 && error == 0) {
freebsd11_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.
*/
int
freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap)
{
struct freebsd11_statfs osb;
struct statfs *sfp;
fhandle_t fh;
int error;
error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
if (error)
return (error);
sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_fhstatfs(td, fh, sfp);
if (error == 0) {
freebsd11_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
freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp)
{
bzero(osp, sizeof(*osp));
osp->f_version = FREEBSD11_STATFS_VERSION;
osp->f_type = nsp->f_type;
osp->f_flags = nsp->f_flags;
osp->f_bsize = nsp->f_bsize;
osp->f_iosize = nsp->f_iosize;
osp->f_blocks = nsp->f_blocks;
osp->f_bfree = nsp->f_bfree;
osp->f_bavail = nsp->f_bavail;
osp->f_files = nsp->f_files;
osp->f_ffree = nsp->f_ffree;
osp->f_syncwrites = nsp->f_syncwrites;
osp->f_asyncwrites = nsp->f_asyncwrites;
osp->f_syncreads = nsp->f_syncreads;
osp->f_asyncreads = nsp->f_asyncreads;
osp->f_namemax = nsp->f_namemax;
osp->f_owner = nsp->f_owner;
osp->f_fsid = nsp->f_fsid;
strlcpy(osp->f_fstypename, nsp->f_fstypename,
MIN(MFSNAMELEN, sizeof(osp->f_fstypename)));
strlcpy(osp->f_mntonname, nsp->f_mntonname,
MIN(MNAMELEN, sizeof(osp->f_mntonname)));
strlcpy(osp->f_mntfromname, nsp->f_mntfromname,
MIN(MNAMELEN, sizeof(osp->f_mntfromname)));
}
#endif /* COMPAT_FREEBSD11 */
/*
* 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;
int error;
AUDIT_ARG_FD(uap->fd);
error = getvnode(td, uap->fd, &cap_fchdir_rights,
&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);
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, const 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);
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);
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, const 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);
if (flags & O_TRUNC) {
error = fo_truncate(fp, 0, td->td_ucred, td);
if (error != 0)
goto bad;
}
success:
/*
* If we haven't already installed the FD (for dupfdopen), do so now.
*/
if (indx == -1) {
struct filecaps *fcaps;
#ifdef CAPABILITIES
if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0)
fcaps = &nd.ni_filecaps;
else
#endif
fcaps = NULL;
error = finstall(td, fp, &indx, flags, fcaps);
/* On success finstall() consumes fcaps. */
if (error != 0) {
filecaps_free(&nd.ni_filecaps);
goto bad;
}
} else {
filecaps_free(&nd.ni_filecaps);
}
/*
* Release our private reference, leaving the one associated with
* the descriptor table intact.
*/
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
bad:
KASSERT(indx == -1, ("indx=%d, should be -1", indx));
fdrop(fp, td);
return (error);
}
#ifdef COMPAT_43
/*
* Create a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct ocreat_args {
char *path;
int mode;
};
#endif
int
ocreat(struct thread *td, struct ocreat_args *uap)
{
return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
}
#endif /* COMPAT_43 */
/*
* Create a special file.
*/
#ifndef _SYS_SYSPROTO_H_
struct mknodat_args {
int fd;
char *path;
mode_t mode;
dev_t dev;
};
#endif
int
sys_mknodat(struct thread *td, struct mknodat_args *uap)
{
return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
uap->dev));
}
#if defined(COMPAT_FREEBSD11)
int
freebsd11_mknod(struct thread *td,
struct freebsd11_mknod_args *uap)
{
return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->mode, uap->dev));
}
int
freebsd11_mknodat(struct thread *td,
struct freebsd11_mknodat_args *uap)
{
return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode,
uap->dev));
}
#endif /* COMPAT_FREEBSD11 */
int
kern_mknodat(struct thread *td, int fd, const char *path, enum uio_seg pathseg,
int mode, dev_t dev)
{
struct vnode *vp;
struct mount *mp;
struct vattr vattr;
struct nameidata nd;
int error, whiteout = 0;
AUDIT_ARG_MODE(mode);
AUDIT_ARG_DEV(dev);
switch (mode & S_IFMT) {
case S_IFCHR:
case S_IFBLK:
error = priv_check(td, PRIV_VFS_MKNOD_DEV);
if (error == 0 && dev == VNOVAL)
error = EINVAL;
break;
case S_IFWHT:
error = priv_check(td, PRIV_VFS_MKNOD_WHT);
break;
case S_IFIFO:
if (dev == 0)
return (kern_mkfifoat(td, fd, path, pathseg, mode));
/* FALLTHROUGH */
default:
error = EINVAL;
break;
}
if (error != 0)
return (error);
restart:
bwillwrite();
NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
NOCACHE, pathseg, path, fd, &cap_mknodat_rights,
td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
return (EEXIST);
} else {
VATTR_NULL(&vattr);
vattr.va_mode = (mode & ALLPERMS) &
~td->td_proc->p_fd->fd_cmask;
vattr.va_rdev = dev;
whiteout = 0;
switch (mode & S_IFMT) {
case S_IFCHR:
vattr.va_type = VCHR;
break;
case S_IFBLK:
vattr.va_type = VBLK;
break;
case S_IFWHT:
whiteout = 1;
break;
default:
panic("kern_mknod: invalid mode");
}
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
#ifdef MAC
if (error == 0 && !whiteout)
error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp,
&nd.ni_cnd, &vattr);
#endif
if (error == 0) {
if (whiteout)
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
else {
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
&nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
}
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
return (error);
}
/*
* Create a named pipe.
*/
#ifndef _SYS_SYSPROTO_H_
struct mkfifo_args {
char *path;
int mode;
};
#endif
int
sys_mkfifo(struct thread *td, struct mkfifo_args *uap)
{
return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->mode));
}
#ifndef _SYS_SYSPROTO_H_
struct mkfifoat_args {
int fd;
char *path;
mode_t mode;
};
#endif
int
sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
{
return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE,
uap->mode));
}
int
kern_mkfifoat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, int mode)
{
struct mount *mp;
struct vattr vattr;
struct nameidata nd;
int error;
AUDIT_ARG_MODE(mode);
restart:
bwillwrite();
NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights,
td);
if ((error = namei(&nd)) != 0)
return (error);
if (nd.ni_vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask;
#ifdef MAC
error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
&vattr);
if (error != 0)
goto out;
#endif
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
#ifdef MAC
out:
#endif
vput(nd.ni_dvp);
vn_finished_write(mp);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
/*
* Make a hard file link.
*/
#ifndef _SYS_SYSPROTO_H_
struct link_args {
char *path;
char *link;
};
#endif
int
sys_link(struct thread *td, struct link_args *uap)
{
return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
UIO_USERSPACE, FOLLOW));
}
#ifndef _SYS_SYSPROTO_H_
struct linkat_args {
int fd1;
char *path1;
int fd2;
char *path2;
int flag;
};
#endif
int
sys_linkat(struct thread *td, struct linkat_args *uap)
{
int flag;
flag = uap->flag;
if ((flag & ~(AT_SYMLINK_FOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2,
UIO_USERSPACE, ((flag & AT_SYMLINK_FOLLOW) != 0 ? FOLLOW :
NOFOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0)));
}
int hardlink_check_uid = 0;
SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
&hardlink_check_uid, 0,
"Unprivileged processes cannot create hard links to files owned by other "
"users");
static int hardlink_check_gid = 0;
SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
&hardlink_check_gid, 0,
"Unprivileged processes cannot create hard links to files owned by other "
"groups");
static int
can_hardlink(struct vnode *vp, struct ucred *cred)
{
struct vattr va;
int error;
if (!hardlink_check_uid && !hardlink_check_gid)
return (0);
error = VOP_GETATTR(vp, &va, cred);
if (error != 0)
return (error);
if (hardlink_check_uid && cred->cr_uid != va.va_uid) {
error = priv_check_cred(cred, PRIV_VFS_LINK);
if (error != 0)
return (error);
}
if (hardlink_check_gid && !groupmember(va.va_gid, cred)) {
error = priv_check_cred(cred, PRIV_VFS_LINK);
if (error != 0)
return (error);
}
return (0);
}
int
kern_linkat(struct thread *td, int fd1, int fd2, const char *path1,
const char *path2, enum uio_seg segflag, int follow)
{
struct nameidata nd;
int error;
do {
bwillwrite();
NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag,
path1, fd1, &cap_linkat_source_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag);
} while (error == EAGAIN);
return (error);
}
static int
kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path,
enum uio_seg segflag)
{
struct nameidata nd;
struct mount *mp;
int error;
if (vp->v_type == VDIR) {
vrele(vp);
return (EPERM); /* POSIX */
}
NDINIT_ATRIGHTS(&nd, CREATE,
LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd,
&cap_linkat_target_rights, td);
if ((error = namei(&nd)) == 0) {
if (nd.ni_vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
vrele(vp);
return (EEXIST);
} else if (nd.ni_dvp->v_mount != vp->v_mount) {
/*
* Cross-device link. No need to recheck
* vp->v_type, since it cannot change, except
* to VBAD.
*/
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vrele(vp);
return (EXDEV);
} else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) {
error = can_hardlink(vp, td->td_ucred);
#ifdef MAC
if (error == 0)
error = mac_vnode_check_link(td->td_ucred,
nd.ni_dvp, vp, &nd.ni_cnd);
#endif
if (error != 0) {
vput(vp);
vput(nd.ni_dvp);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
error = vn_start_write(vp, &mp, V_NOWAIT);
if (error != 0) {
vput(vp);
vput(nd.ni_dvp);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_start_write(NULL, &mp,
V_XSLEEP | PCATCH);
if (error != 0)
return (error);
return (EAGAIN);
}
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
VOP_UNLOCK(vp);
vput(nd.ni_dvp);
vn_finished_write(mp);
NDFREE(&nd, NDF_ONLY_PNBUF);
} else {
vput(nd.ni_dvp);
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(vp);
return (EAGAIN);
}
}
vrele(vp);
return (error);
}
/*
* Make a symbolic link.
*/
#ifndef _SYS_SYSPROTO_H_
struct symlink_args {
char *path;
char *link;
};
#endif
int
sys_symlink(struct thread *td, struct symlink_args *uap)
{
return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
UIO_USERSPACE));
}
#ifndef _SYS_SYSPROTO_H_
struct symlinkat_args {
char *path;
int fd;
char *path2;
};
#endif
int
sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
{
return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2,
UIO_USERSPACE));
}
int
kern_symlinkat(struct thread *td, const char *path1, int fd, const char *path2,
enum uio_seg segflg)
{
struct mount *mp;
struct vattr vattr;
const char *syspath;
char *tmppath;
struct nameidata nd;
int error;
if (segflg == UIO_SYSSPACE) {
syspath = path1;
} else {
tmppath = uma_zalloc(namei_zone, M_WAITOK);
if ((error = copyinstr(path1, tmppath, MAXPATHLEN, NULL)) != 0)
goto out;
syspath = tmppath;
}
AUDIT_ARG_TEXT(syspath);
restart:
bwillwrite();
NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
NOCACHE, segflg, path2, fd, &cap_symlinkat_rights,
td);
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
goto out;
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
#ifdef MAC
vattr.va_type = VLNK;
error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
&vattr);
if (error != 0)
goto out2;
#endif
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
if (error == 0)
vput(nd.ni_vp);
#ifdef MAC
out2:
#endif
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
out:
if (segflg != UIO_SYSSPACE)
uma_zfree(namei_zone, tmppath);
return (error);
}
/*
* Delete a whiteout from the filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct undelete_args {
char *path;
};
#endif
int
sys_undelete(struct thread *td, struct undelete_args *uap)
{
struct mount *mp;
struct nameidata nd;
int error;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error != 0)
return (error);
if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
return (error);
}
/*
* Delete a name from the filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct unlink_args {
char *path;
};
#endif
int
sys_unlink(struct thread *td, struct unlink_args *uap)
{
return (kern_funlinkat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
0, 0));
}
static int
kern_funlinkat_ex(struct thread *td, int dfd, const char *path, int fd,
int flag, enum uio_seg pathseg, ino_t oldinum)
{
if ((flag & ~AT_REMOVEDIR) != 0)
return (EINVAL);
if ((flag & AT_REMOVEDIR) != 0)
return (kern_frmdirat(td, dfd, path, fd, UIO_USERSPACE, 0));
return (kern_funlinkat(td, dfd, path, fd, UIO_USERSPACE, 0, 0));
}
#ifndef _SYS_SYSPROTO_H_
struct unlinkat_args {
int fd;
char *path;
int flag;
};
#endif
int
sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
{
return (kern_funlinkat_ex(td, uap->fd, uap->path, FD_NONE, uap->flag,
UIO_USERSPACE, 0));
}
#ifndef _SYS_SYSPROTO_H_
struct funlinkat_args {
int dfd;
const char *path;
int fd;
int flag;
};
#endif
int
sys_funlinkat(struct thread *td, struct funlinkat_args *uap)
{
return (kern_funlinkat_ex(td, uap->dfd, uap->path, uap->fd, uap->flag,
UIO_USERSPACE, 0));
}
int
kern_funlinkat(struct thread *td, int dfd, const char *path, int fd,
enum uio_seg pathseg, int flag, ino_t oldinum)
{
struct mount *mp;
struct file *fp;
struct vnode *vp;
struct nameidata nd;
struct stat sb;
int error;
fp = NULL;
if (fd != FD_NONE) {
error = getvnode(td, fd, &cap_no_rights, &fp);
if (error != 0)
return (error);
}
restart:
bwillwrite();
NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
((flag & AT_BENEATH) != 0 ? BENEATH : 0),
pathseg, path, dfd, &cap_unlinkat_rights, td);
if ((error = namei(&nd)) != 0) {
if (error == EINVAL)
error = EPERM;
goto fdout;
}
vp = nd.ni_vp;
if (vp->v_type == VDIR && oldinum == 0) {
error = EPERM; /* POSIX */
} else if (oldinum != 0 &&
((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
sb.st_ino != oldinum) {
error = EIDRM; /* Identifier removed */
} else if (fp != NULL && fp->f_vnode != vp) {
if (VN_IS_DOOMED(fp->f_vnode))
error = EBADF;
else
error = EDEADLK;
} else {
/*
* The root of a mounted filesystem cannot be deleted.
*
* XXX: can this only be a VDIR case?
*/
if (vp->v_vflag & VV_ROOT)
error = EBUSY;
}
if (error == 0) {
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if (vp == nd.ni_dvp)
vrele(vp);
else
vput(vp);
if ((error = vn_start_write(NULL, &mp,
V_XSLEEP | PCATCH)) != 0) {
goto fdout;
}
goto restart;
}
#ifdef MAC
error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
&nd.ni_cnd);
if (error != 0)
goto out;
#endif
vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
#ifdef MAC
out:
#endif
vn_finished_write(mp);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if (vp == nd.ni_dvp)
vrele(vp);
else
vput(vp);
fdout:
if (fp != NULL)
fdrop(fp, td);
return (error);
}
/*
* Reposition read/write file offset.
*/
#ifndef _SYS_SYSPROTO_H_
struct lseek_args {
int fd;
int pad;
off_t offset;
int whence;
};
#endif
int
sys_lseek(struct thread *td, struct lseek_args *uap)
{
return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
}
int
kern_lseek(struct thread *td, int fd, off_t offset, int whence)
{
struct file *fp;
int error;
AUDIT_ARG_FD(fd);
error = fget(td, fd, &cap_seek_rights, &fp);
if (error != 0)
return (error);
error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
fo_seek(fp, offset, whence, td) : ESPIPE;
fdrop(fp, td);
return (error);
}
#if defined(COMPAT_43)
/*
* Reposition read/write file offset.
*/
#ifndef _SYS_SYSPROTO_H_
struct olseek_args {
int fd;
long offset;
int whence;
};
#endif
int
olseek(struct thread *td, struct olseek_args *uap)
{
return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
}
#endif /* COMPAT_43 */
#if defined(COMPAT_FREEBSD6)
/* Version with the 'pad' argument */
int
freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap)
{
return (kern_lseek(td, uap->fd, uap->offset, uap->whence));
}
#endif
/*
* Check access permissions using passed credentials.
*/
static int
vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
struct thread *td)
{
accmode_t accmode;
int error;
/* Flags == 0 means only check for existence. */
if (user_flags == 0)
return (0);
accmode = 0;
if (user_flags & R_OK)
accmode |= VREAD;
if (user_flags & W_OK)
accmode |= VWRITE;
if (user_flags & X_OK)
accmode |= VEXEC;
#ifdef MAC
error = mac_vnode_check_access(cred, vp, accmode);
if (error != 0)
return (error);
#endif
if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
error = VOP_ACCESS(vp, accmode, cred, td);
return (error);
}
/*
* Check access permissions using "real" credentials.
*/
#ifndef _SYS_SYSPROTO_H_
struct access_args {
char *path;
int amode;
};
#endif
int
sys_access(struct thread *td, struct access_args *uap)
{
return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
0, uap->amode));
}
#ifndef _SYS_SYSPROTO_H_
struct faccessat_args {
int dirfd;
char *path;
int amode;
int flag;
}
#endif
int
sys_faccessat(struct thread *td, struct faccessat_args *uap)
{
return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
uap->amode));
}
int
kern_accessat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, int flag, int amode)
{
struct ucred *cred, *usecred;
struct vnode *vp;
struct nameidata nd;
int error;
if ((flag & ~(AT_EACCESS | AT_BENEATH)) != 0)
return (EINVAL);
if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
return (EINVAL);
/*
* Create and modify a temporary credential instead of one that
* is potentially shared (if we need one).
*/
cred = td->td_ucred;
if ((flag & AT_EACCESS) == 0 &&
((cred->cr_uid != cred->cr_ruid ||
cred->cr_rgid != cred->cr_groups[0]))) {
usecred = crdup(cred);
usecred->cr_uid = cred->cr_ruid;
usecred->cr_groups[0] = cred->cr_rgid;
td->td_ucred = usecred;
} else
usecred = cred;
AUDIT_ARG_VALUE(amode);
NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
AUDITVNODE1 | ((flag & AT_BENEATH) != 0 ? BENEATH : 0),
pathseg, path, fd, &cap_fstat_rights, td);
if ((error = namei(&nd)) != 0)
goto out;
vp = nd.ni_vp;
error = vn_access(vp, amode, usecred, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
out:
if (usecred != cred) {
td->td_ucred = cred;
crfree(usecred);
}
return (error);
}
/*
* Check access permissions using "effective" credentials.
*/
#ifndef _SYS_SYSPROTO_H_
struct eaccess_args {
char *path;
int amode;
};
#endif
int
sys_eaccess(struct thread *td, struct eaccess_args *uap)
{
return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
AT_EACCESS, uap->amode));
}
#if defined(COMPAT_43)
/*
* Get file status; this version follows links.
*/
#ifndef _SYS_SYSPROTO_H_
struct ostat_args {
char *path;
struct ostat *ub;
};
#endif
int
ostat(struct thread *td, struct ostat_args *uap)
{
struct stat sb;
struct ostat osb;
int error;
error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
&sb, NULL);
if (error != 0)
return (error);
cvtstat(&sb, &osb);
return (copyout(&osb, uap->ub, sizeof (osb)));
}
/*
* Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct olstat_args {
char *path;
struct ostat *ub;
};
#endif
int
olstat(struct thread *td, struct olstat_args *uap)
{
struct stat sb;
struct ostat osb;
int error;
error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
UIO_USERSPACE, &sb, NULL);
if (error != 0)
return (error);
cvtstat(&sb, &osb);
return (copyout(&osb, uap->ub, sizeof (osb)));
}
/*
* Convert from an old to a new stat structure.
* XXX: many values are blindly truncated.
*/
void
cvtstat(struct stat *st, struct ostat *ost)
{
bzero(ost, sizeof(*ost));
ost->st_dev = st->st_dev;
ost->st_ino = st->st_ino;
ost->st_mode = st->st_mode;
ost->st_nlink = st->st_nlink;
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
ost->st_size = MIN(st->st_size, INT32_MAX);
ost->st_atim = st->st_atim;
ost->st_mtim = st->st_mtim;
ost->st_ctim = st->st_ctim;
ost->st_blksize = st->st_blksize;
ost->st_blocks = st->st_blocks;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
}
#endif /* COMPAT_43 */
#if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
int ino64_trunc_error;
SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW,
&ino64_trunc_error, 0,
"Error on truncation of device, file or inode number, or link count");
int
freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost)
{
ost->st_dev = st->st_dev;
if (ost->st_dev != st->st_dev) {
switch (ino64_trunc_error) {
default:
/*
* Since dev_t is almost raw, don't clamp to the
* maximum for case 2, but ignore the error.
*/
break;
case 1:
return (EOVERFLOW);
}
}
ost->st_ino = st->st_ino;
if (ost->st_ino != st->st_ino) {
switch (ino64_trunc_error) {
default:
case 0:
break;
case 1:
return (EOVERFLOW);
case 2:
ost->st_ino = UINT32_MAX;
break;
}
}
ost->st_mode = st->st_mode;
ost->st_nlink = st->st_nlink;
if (ost->st_nlink != st->st_nlink) {
switch (ino64_trunc_error) {
default:
case 0:
break;
case 1:
return (EOVERFLOW);
case 2:
ost->st_nlink = UINT16_MAX;
break;
}
}
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
if (ost->st_rdev != st->st_rdev) {
switch (ino64_trunc_error) {
default:
break;
case 1:
return (EOVERFLOW);
}
}
ost->st_atim = st->st_atim;
ost->st_mtim = st->st_mtim;
ost->st_ctim = st->st_ctim;
ost->st_size = st->st_size;
ost->st_blocks = st->st_blocks;
ost->st_blksize = st->st_blksize;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
ost->st_lspare = 0;
ost->st_birthtim = st->st_birthtim;
bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim),
sizeof(*ost) - offsetof(struct freebsd11_stat,
st_birthtim) - sizeof(ost->st_birthtim));
return (0);
}
int
freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap)
{
struct stat sb;
struct freebsd11_stat osb;
int error;
error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
&sb, NULL);
if (error != 0)
return (error);
error = freebsd11_cvtstat(&sb, &osb);
if (error == 0)
error = copyout(&osb, uap->ub, sizeof(osb));
return (error);
}
int
freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap)
{
struct stat sb;
struct freebsd11_stat osb;
int error;
error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
UIO_USERSPACE, &sb, NULL);
if (error != 0)
return (error);
error = freebsd11_cvtstat(&sb, &osb);
if (error == 0)
error = copyout(&osb, uap->ub, sizeof(osb));
return (error);
}
int
freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap)
{
struct fhandle fh;
struct stat sb;
struct freebsd11_stat osb;
int error;
error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
if (error != 0)
return (error);
error = kern_fhstat(td, fh, &sb);
if (error != 0)
return (error);
error = freebsd11_cvtstat(&sb, &osb);
if (error == 0)
error = copyout(&osb, uap->sb, sizeof(osb));
return (error);
}
int
freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap)
{
struct stat sb;
struct freebsd11_stat osb;
int error;
error = kern_statat(td, uap->flag, uap->fd, uap->path,
UIO_USERSPACE, &sb, NULL);
if (error != 0)
return (error);
error = freebsd11_cvtstat(&sb, &osb);
if (error == 0)
error = copyout(&osb, uap->buf, sizeof(osb));
return (error);
}
#endif /* COMPAT_FREEBSD11 */
/*
* Get file status
*/
#ifndef _SYS_SYSPROTO_H_
struct fstatat_args {
int fd;
char *path;
struct stat *buf;
int flag;
}
#endif
int
sys_fstatat(struct thread *td, struct fstatat_args *uap)
{
struct stat sb;
int error;
error = kern_statat(td, uap->flag, uap->fd, uap->path,
UIO_USERSPACE, &sb, NULL);
if (error == 0)
error = copyout(&sb, uap->buf, sizeof (sb));
return (error);
}
int
kern_statat(struct thread *td, int flag, int fd, const char *path,
enum uio_seg pathseg, struct stat *sbp,
void (*hook)(struct vnode *vp, struct stat *sbp))
{
struct nameidata nd;
int error;
if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) != 0 ?
NOFOLLOW : FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) |
LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd,
&cap_fstat_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, sbp, td->td_ucred, NOCRED, td);
if (error == 0) {
SDT_PROBE2(vfs, , stat, mode, path, sbp->st_mode);
if (S_ISREG(sbp->st_mode))
SDT_PROBE2(vfs, , stat, reg, path, pathseg);
if (__predict_false(hook != NULL))
hook(nd.ni_vp, sbp);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_vp);
if (error != 0)
return (error);
#ifdef __STAT_TIME_T_EXT
sbp->st_atim_ext = 0;
sbp->st_mtim_ext = 0;
sbp->st_ctim_ext = 0;
sbp->st_btim_ext = 0;
#endif
#ifdef KTRACE
if (KTRPOINT(td, KTR_STRUCT))
ktrstat(sbp);
#endif
return (0);
}
#if defined(COMPAT_FREEBSD11)
/*
* Implementation of the NetBSD [l]stat() functions.
*/
void
freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb)
{
bzero(nsb, sizeof(*nsb));
nsb->st_dev = sb->st_dev;
nsb->st_ino = sb->st_ino;
nsb->st_mode = sb->st_mode;
nsb->st_nlink = sb->st_nlink;
nsb->st_uid = sb->st_uid;
nsb->st_gid = sb->st_gid;
nsb->st_rdev = sb->st_rdev;
nsb->st_atim = sb->st_atim;
nsb->st_mtim = sb->st_mtim;
nsb->st_ctim = sb->st_ctim;
nsb->st_size = sb->st_size;
nsb->st_blocks = sb->st_blocks;
nsb->st_blksize = sb->st_blksize;
nsb->st_flags = sb->st_flags;
nsb->st_gen = sb->st_gen;
nsb->st_birthtim = sb->st_birthtim;
}
#ifndef _SYS_SYSPROTO_H_
struct freebsd11_nstat_args {
char *path;
struct nstat *ub;
};
#endif
int
freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap)
{
struct stat sb;
struct nstat nsb;
int error;
error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
&sb, NULL);
if (error != 0)
return (error);
freebsd11_cvtnstat(&sb, &nsb);
return (copyout(&nsb, uap->ub, sizeof (nsb)));
}
/*
* NetBSD lstat. Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct freebsd11_nlstat_args {
char *path;
struct nstat *ub;
};
#endif
int
freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap)
{
struct stat sb;
struct nstat nsb;
int error;
error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
UIO_USERSPACE, &sb, NULL);
if (error != 0)
return (error);
freebsd11_cvtnstat(&sb, &nsb);
return (copyout(&nsb, uap->ub, sizeof (nsb)));
}
#endif /* COMPAT_FREEBSD11 */
/*
* Get configurable pathname variables.
*/
#ifndef _SYS_SYSPROTO_H_
struct pathconf_args {
char *path;
int name;
};
#endif
int
sys_pathconf(struct thread *td, struct pathconf_args *uap)
{
long value;
int error;
error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW,
&value);
if (error == 0)
td->td_retval[0] = value;
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct lpathconf_args {
char *path;
int name;
};
#endif
int
sys_lpathconf(struct thread *td, struct lpathconf_args *uap)
{
long value;
int error;
error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name,
NOFOLLOW, &value);
if (error == 0)
td->td_retval[0] = value;
return (error);
}
int
kern_pathconf(struct thread *td, const char *path, enum uio_seg pathseg,
int name, u_long flags, long *valuep)
{
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = VOP_PATHCONF(nd.ni_vp, name, valuep);
vput(nd.ni_vp);
return (error);
}
/*
* Return target name of a symbolic link.
*/
#ifndef _SYS_SYSPROTO_H_
struct readlink_args {
char *path;
char *buf;
size_t count;
};
#endif
int
sys_readlink(struct thread *td, struct readlink_args *uap)
{
return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->buf, UIO_USERSPACE, uap->count));
}
#ifndef _SYS_SYSPROTO_H_
struct readlinkat_args {
int fd;
char *path;
char *buf;
size_t bufsize;
};
#endif
int
sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
{
return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE,
uap->buf, UIO_USERSPACE, uap->bufsize));
}
int
kern_readlinkat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count)
{
struct vnode *vp;
struct nameidata nd;
int error;
if (count > IOSIZE_MAX)
return (EINVAL);
NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
pathseg, path, fd, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
error = kern_readlink_vp(vp, buf, bufseg, count, td);
vput(vp);
return (error);
}
/*
* Helper function to readlink from a vnode
*/
static int
kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count,
struct thread *td)
{
struct iovec aiov;
struct uio auio;
int error;
ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked");
#ifdef MAC
error = mac_vnode_check_readlink(td->td_ucred, vp);
if (error != 0)
return (error);
#endif
if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0)
return (EINVAL);
aiov.iov_base = buf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = bufseg;
auio.uio_td = td;
auio.uio_resid = count;
error = VOP_READLINK(vp, &auio, td->td_ucred);
td->td_retval[0] = count - auio.uio_resid;
return (error);
}
/*
* Common implementation code for chflags() and fchflags().
*/
static int
setfflags(struct thread *td, struct vnode *vp, u_long flags)
{
struct mount *mp;
struct vattr vattr;
int error;
/* We can't support the value matching VNOVAL. */
if (flags == VNOVAL)
return (EOPNOTSUPP);
/*
* Prevent non-root users from setting flags on devices. When
* a device is reused, users can retain ownership of the device
* if they are allowed to set flags and programs assume that
* chown can't fail when done as root.
*/
if (vp->v_type == VCHR || vp->v_type == VBLK) {
error = priv_check(td, PRIV_VFS_CHFLAGS_DEV);
if (error != 0)
return (error);
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VATTR_NULL(&vattr);
vattr.va_flags = flags;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
#ifdef MAC
error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vattr, td->td_ucred);
VOP_UNLOCK(vp);
vn_finished_write(mp);
return (error);
}
/*
* Change flags of a file given a path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chflags_args {
const char *path;
u_long flags;
};
#endif
int
sys_chflags(struct thread *td, struct chflags_args *uap)
{
return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->flags, 0));
}
#ifndef _SYS_SYSPROTO_H_
struct chflagsat_args {
int fd;
const char *path;
u_long flags;
int atflag;
}
#endif
int
sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
{
if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE,
uap->flags, uap->atflag));
}
/*
* Same as chflags() but doesn't follow symlinks.
*/
#ifndef _SYS_SYSPROTO_H_
struct lchflags_args {
const char *path;
u_long flags;
};
#endif
int
sys_lchflags(struct thread *td, struct lchflags_args *uap)
{
return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->flags, AT_SYMLINK_NOFOLLOW));
}
static int
kern_chflagsat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, u_long flags, int atflag)
{
struct nameidata nd;
int error, follow;
AUDIT_ARG_FFLAGS(flags);
follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
follow |= (atflag & AT_BENEATH) != 0 ? BENEATH : 0;
NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
&cap_fchflags_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfflags(td, nd.ni_vp, flags);
vrele(nd.ni_vp);
return (error);
}
/*
* Change flags of a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchflags_args {
int fd;
u_long flags;
};
#endif
int
sys_fchflags(struct thread *td, struct fchflags_args *uap)
{
struct file *fp;
int error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_FFLAGS(uap->flags);
error = getvnode(td, uap->fd, &cap_fchflags_rights,
&fp);
if (error != 0)
return (error);
#ifdef AUDIT
vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
AUDIT_ARG_VNODE1(fp->f_vnode);
VOP_UNLOCK(fp->f_vnode);
#endif
error = setfflags(td, fp->f_vnode, uap->flags);
fdrop(fp, td);
return (error);
}
/*
* Common implementation code for chmod(), lchmod() and fchmod().
*/
int
setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode)
{
struct mount *mp;
struct vattr vattr;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
#ifdef MAC
error = mac_vnode_check_setmode(cred, vp, vattr.va_mode);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vattr, cred);
VOP_UNLOCK(vp);
vn_finished_write(mp);
return (error);
}
/*
* Change mode of a file given path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chmod_args {
char *path;
int mode;
};
#endif
int
sys_chmod(struct thread *td, struct chmod_args *uap)
{
return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->mode, 0));
}
#ifndef _SYS_SYSPROTO_H_
struct fchmodat_args {
int dirfd;
char *path;
mode_t mode;
int flag;
}
#endif
int
sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
{
if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE,
uap->mode, uap->flag));
}
/*
* Change mode of a file given path name (don't follow links.)
*/
#ifndef _SYS_SYSPROTO_H_
struct lchmod_args {
char *path;
int mode;
};
#endif
int
sys_lchmod(struct thread *td, struct lchmod_args *uap)
{
return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->mode, AT_SYMLINK_NOFOLLOW));
}
int
kern_fchmodat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, mode_t mode, int flag)
{
struct nameidata nd;
int error, follow;
AUDIT_ARG_MODE(mode);
follow = (flag & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : FOLLOW;
follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0;
NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
&cap_fchmod_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfmode(td, td->td_ucred, nd.ni_vp, mode);
vrele(nd.ni_vp);
return (error);
}
/*
* Change mode of a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchmod_args {
int fd;
int mode;
};
#endif
int
sys_fchmod(struct thread *td, struct fchmod_args *uap)
{
struct file *fp;
int error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_MODE(uap->mode);
error = fget(td, uap->fd, &cap_fchmod_rights, &fp);
if (error != 0)
return (error);
error = fo_chmod(fp, uap->mode, td->td_ucred, td);
fdrop(fp, td);
return (error);
}
/*
* Common implementation for chown(), lchown(), and fchown()
*/
int
setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
gid_t gid)
{
struct mount *mp;
struct vattr vattr;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
#ifdef MAC
error = mac_vnode_check_setowner(cred, vp, vattr.va_uid,
vattr.va_gid);
if (error == 0)
#endif
error = VOP_SETATTR(vp, &vattr, cred);
VOP_UNLOCK(vp);
vn_finished_write(mp);
return (error);
}
/*
* Set ownership given a path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chown_args {
char *path;
int uid;
int gid;
};
#endif
int
sys_chown(struct thread *td, struct chown_args *uap)
{
return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid,
uap->gid, 0));
}
#ifndef _SYS_SYSPROTO_H_
struct fchownat_args {
int fd;
const char * path;
uid_t uid;
gid_t gid;
int flag;
};
#endif
int
sys_fchownat(struct thread *td, struct fchownat_args *uap)
{
if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid,
uap->gid, uap->flag));
}
int
kern_fchownat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, int uid, int gid, int flag)
{
struct nameidata nd;
int error, follow;
AUDIT_ARG_OWNER(uid, gid);
follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
follow |= (flag & AT_BENEATH) != 0 ? BENEATH : 0;
NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd,
&cap_fchown_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid);
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a path name, do not cross symlinks.
*/
#ifndef _SYS_SYSPROTO_H_
struct lchown_args {
char *path;
int uid;
int gid;
};
#endif
int
sys_lchown(struct thread *td, struct lchown_args *uap)
{
return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
}
/*
* Set ownership given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchown_args {
int fd;
int uid;
int gid;
};
#endif
int
sys_fchown(struct thread *td, struct fchown_args *uap)
{
struct file *fp;
int error;
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_OWNER(uap->uid, uap->gid);
error = fget(td, uap->fd, &cap_fchown_rights, &fp);
if (error != 0)
return (error);
error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
fdrop(fp, td);
return (error);
}
/*
* Common implementation code for utimes(), lutimes(), and futimes().
*/
static int
getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg,
struct timespec *tsp)
{
struct timeval tv[2];
const struct timeval *tvp;
int error;
if (usrtvp == NULL) {
vfs_timestamp(&tsp[0]);
tsp[1] = tsp[0];
} else {
if (tvpseg == UIO_SYSSPACE) {
tvp = usrtvp;
} else {
if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0)
return (error);
tvp = tv;
}
if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 ||
tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
return (EINVAL);
TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
}
return (0);
}
/*
* Common implementation code for futimens(), utimensat().
*/
#define UTIMENS_NULL 0x1
#define UTIMENS_EXIT 0x2
static int
getutimens(const struct timespec *usrtsp, enum uio_seg tspseg,
struct timespec *tsp, int *retflags)
{
struct timespec tsnow;
int error;
vfs_timestamp(&tsnow);
*retflags = 0;
if (usrtsp == NULL) {
tsp[0] = tsnow;
tsp[1] = tsnow;
*retflags |= UTIMENS_NULL;
return (0);
}
if (tspseg == UIO_SYSSPACE) {
tsp[0] = usrtsp[0];
tsp[1] = usrtsp[1];
} else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0)
return (error);
if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT)
*retflags |= UTIMENS_EXIT;
if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW)
*retflags |= UTIMENS_NULL;
if (tsp[0].tv_nsec == UTIME_OMIT)
tsp[0].tv_sec = VNOVAL;
else if (tsp[0].tv_nsec == UTIME_NOW)
tsp[0] = tsnow;
else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L)
return (EINVAL);
if (tsp[1].tv_nsec == UTIME_OMIT)
tsp[1].tv_sec = VNOVAL;
else if (tsp[1].tv_nsec == UTIME_NOW)
tsp[1] = tsnow;
else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L)
return (EINVAL);
return (0);
}
/*
* Common implementation code for utimes(), lutimes(), futimes(), futimens(),
* and utimensat().
*/
static int
setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts,
int numtimes, int nullflag)
{
struct mount *mp;
struct vattr vattr;
int error, setbirthtime;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
setbirthtime = 0;
if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
timespeccmp(&ts[1], &vattr.va_birthtime, < ))
setbirthtime = 1;
VATTR_NULL(&vattr);
vattr.va_atime = ts[0];
vattr.va_mtime = ts[1];
if (setbirthtime)
vattr.va_birthtime = ts[1];
if (numtimes > 2)
vattr.va_birthtime = ts[2];
if (nullflag)
vattr.va_vaflags |= VA_UTIMES_NULL;
#ifdef MAC
error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime,
vattr.va_mtime);
#endif
if (error == 0)
error = VOP_SETATTR(vp, &vattr, td->td_ucred);
VOP_UNLOCK(vp);
vn_finished_write(mp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct utimes_args {
char *path;
struct timeval *tptr;
};
#endif
int
sys_utimes(struct thread *td, struct utimes_args *uap)
{
return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->tptr, UIO_USERSPACE));
}
#ifndef _SYS_SYSPROTO_H_
struct futimesat_args {
int fd;
const char * path;
const struct timeval * times;
};
#endif
int
sys_futimesat(struct thread *td, struct futimesat_args *uap)
{
return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE,
uap->times, UIO_USERSPACE));
}
int
kern_utimesat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg)
{
struct nameidata nd;
struct timespec ts[2];
int error;
if ((error = getutimes(tptr, tptrseg, ts)) != 0)
return (error);
NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd,
&cap_futimes_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct lutimes_args {
char *path;
struct timeval *tptr;
};
#endif
int
sys_lutimes(struct thread *td, struct lutimes_args *uap)
{
return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr,
UIO_USERSPACE));
}
int
kern_lutimes(struct thread *td, const char *path, enum uio_seg pathseg,
struct timeval *tptr, enum uio_seg tptrseg)
{
struct timespec ts[2];
struct nameidata nd;
int error;
if ((error = getutimes(tptr, tptrseg, ts)) != 0)
return (error);
NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct futimes_args {
int fd;
struct timeval *tptr;
};
#endif
int
sys_futimes(struct thread *td, struct futimes_args *uap)
{
return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE));
}
int
kern_futimes(struct thread *td, int fd, struct timeval *tptr,
enum uio_seg tptrseg)
{
struct timespec ts[2];
struct file *fp;
int error;
AUDIT_ARG_FD(fd);
error = getutimes(tptr, tptrseg, ts);
if (error != 0)
return (error);
error = getvnode(td, fd, &cap_futimes_rights, &fp);
if (error != 0)
return (error);
#ifdef AUDIT
vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
AUDIT_ARG_VNODE1(fp->f_vnode);
VOP_UNLOCK(fp->f_vnode);
#endif
error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL);
fdrop(fp, td);
return (error);
}
int
sys_futimens(struct thread *td, struct futimens_args *uap)
{
return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE));
}
int
kern_futimens(struct thread *td, int fd, struct timespec *tptr,
enum uio_seg tptrseg)
{
struct timespec ts[2];
struct file *fp;
int error, flags;
AUDIT_ARG_FD(fd);
error = getutimens(tptr, tptrseg, ts, &flags);
if (error != 0)
return (error);
if (flags & UTIMENS_EXIT)
return (0);
error = getvnode(td, fd, &cap_futimes_rights, &fp);
if (error != 0)
return (error);
#ifdef AUDIT
vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
AUDIT_ARG_VNODE1(fp->f_vnode);
VOP_UNLOCK(fp->f_vnode);
#endif
error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL);
fdrop(fp, td);
return (error);
}
int
sys_utimensat(struct thread *td, struct utimensat_args *uap)
{
return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE,
uap->times, UIO_USERSPACE, uap->flag));
}
int
kern_utimensat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, struct timespec *tptr, enum uio_seg tptrseg,
int flag)
{
struct nameidata nd;
struct timespec ts[2];
int error, flags;
if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0)
return (error);
NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
FOLLOW) | ((flag & AT_BENEATH) != 0 ? BENEATH : 0) | AUDITVNODE1,
pathseg, path, fd, &cap_futimes_rights, td);
if ((error = namei(&nd)) != 0)
return (error);
/*
* We are allowed to call namei() regardless of 2xUTIME_OMIT.
* POSIX states:
* "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected."
* "Search permission is denied by a component of the path prefix."
*/
NDFREE(&nd, NDF_ONLY_PNBUF);
if ((flags & UTIMENS_EXIT) == 0)
error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Truncate a file given its path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct truncate_args {
char *path;
int pad;
off_t length;
};
#endif
int
sys_truncate(struct thread *td, struct truncate_args *uap)
{
return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
}
int
kern_truncate(struct thread *td, const char *path, enum uio_seg pathseg,
off_t length)
{
struct mount *mp;
struct vnode *vp;
void *rl_cookie;
struct vattr vattr;
struct nameidata nd;
int error;
if (length < 0)
return(EINVAL);
NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
vn_rangelock_unlock(vp, rl_cookie);
vrele(vp);
return (error);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_type == VDIR)
error = EISDIR;
#ifdef MAC
else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) {
}
#endif
else if ((error = vn_writechk(vp)) == 0 &&
(error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = length;
error = VOP_SETATTR(vp, &vattr, td->td_ucred);
}
VOP_UNLOCK(vp);
vn_finished_write(mp);
vn_rangelock_unlock(vp, rl_cookie);
vrele(vp);
return (error);
}
#if defined(COMPAT_43)
/*
* Truncate a file given its path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct otruncate_args {
char *path;
long length;
};
#endif
int
otruncate(struct thread *td, struct otruncate_args *uap)
{
return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
}
#endif /* COMPAT_43 */
#if defined(COMPAT_FREEBSD6)
/* Versions with the pad argument */
int
freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
{
return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
}
int
freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap)
{
return (kern_ftruncate(td, uap->fd, uap->length));
}
#endif
int
kern_fsync(struct thread *td, int fd, bool fullsync)
{
struct vnode *vp;
struct mount *mp;
struct file *fp;
int error, lock_flags;
AUDIT_ARG_FD(fd);
error = getvnode(td, fd, &cap_fsync_rights, &fp);
if (error != 0)
return (error);
vp = fp->f_vnode;
#if 0
if (!fullsync)
/* XXXKIB: compete outstanding aio writes */;
#endif
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error != 0)
goto drop;
if (MNT_SHARED_WRITES(mp) ||
((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) {
lock_flags = LK_SHARED;
} else {
lock_flags = LK_EXCLUSIVE;
}
vn_lock(vp, lock_flags | LK_RETRY);
AUDIT_ARG_VNODE1(vp);
if (vp->v_object != NULL) {
VM_OBJECT_WLOCK(vp->v_object);
vm_object_page_clean(vp->v_object, 0, 0, 0);
VM_OBJECT_WUNLOCK(vp->v_object);
}
error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td);
VOP_UNLOCK(vp);
vn_finished_write(mp);
drop:
fdrop(fp, td);
return (error);
}
/*
* Sync an open file.
*/
#ifndef _SYS_SYSPROTO_H_
struct fsync_args {
int fd;
};
#endif
int
sys_fsync(struct thread *td, struct fsync_args *uap)
{
return (kern_fsync(td, uap->fd, true));
}
int
sys_fdatasync(struct thread *td, struct fdatasync_args *uap)
{
return (kern_fsync(td, uap->fd, false));
}
/*
* Rename files. Source and destination must either both be directories, or
* both not be directories. If target is a directory, it must be empty.
*/
#ifndef _SYS_SYSPROTO_H_
struct rename_args {
char *from;
char *to;
};
#endif
int
sys_rename(struct thread *td, struct rename_args *uap)
{
return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
uap->to, UIO_USERSPACE));
}
#ifndef _SYS_SYSPROTO_H_
struct renameat_args {
int oldfd;
char *old;
int newfd;
char *new;
};
#endif
int
sys_renameat(struct thread *td, struct renameat_args *uap)
{
return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
UIO_USERSPACE));
}
int
kern_renameat(struct thread *td, int oldfd, const char *old, int newfd,
const char *new, enum uio_seg pathseg)
{
struct mount *mp = NULL;
struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
again:
bwillwrite();
#ifdef MAC
NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
AUDITVNODE1, pathseg, old, oldfd,
&cap_renameat_source_rights, td);
#else
NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1,
pathseg, old, oldfd,
&cap_renameat_source_rights, td);
#endif
if ((error = namei(&fromnd)) != 0)
return (error);
#ifdef MAC
error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp,
fromnd.ni_vp, &fromnd.ni_cnd);
VOP_UNLOCK(fromnd.ni_dvp);
if (fromnd.ni_dvp != fromnd.ni_vp)
VOP_UNLOCK(fromnd.ni_vp);
#endif
fvp = fromnd.ni_vp;
NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
SAVESTART | AUDITVNODE2, pathseg, new, newfd,
&cap_renameat_target_rights, td);
if (fromnd.ni_vp->v_type == VDIR)
tond.ni_cnd.cn_flags |= WILLBEDIR;
if ((error = namei(&tond)) != 0) {
/* Translate error code for rename("dir1", "dir2/."). */
if (error == EISDIR && fvp->v_type == VDIR)
error = EINVAL;
NDFREE(&fromnd, NDF_ONLY_PNBUF);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
error = vn_start_write(fvp, &mp, V_NOWAIT);
if (error != 0) {
NDFREE(&fromnd, NDF_ONLY_PNBUF);
NDFREE(&tond, NDF_ONLY_PNBUF);
if (tvp != NULL)
vput(tvp);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
vrele(fromnd.ni_dvp);
vrele(fvp);
vrele(tond.ni_startdir);
if (fromnd.ni_startdir != NULL)
vrele(fromnd.ni_startdir);
error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
if (error != 0)
return (error);
goto again;
}
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = ENOTDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = EISDIR;
goto out;
}
#ifdef CAPABILITIES
if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) {
/*
* If the target already exists we require CAP_UNLINKAT
* from 'newfd', when newfd was used for the lookup.
*/
error = cap_check(&tond.ni_filecaps.fc_rights,
&cap_unlinkat_rights);
if (error != 0)
goto out;
}
#endif
}
if (fvp == tdvp) {
error = EINVAL;
goto out;
}
/*
* If the source is the same as the destination (that is, if they
* are links to the same vnode), then there is nothing to do.
*/
if (fvp == tvp)
error = -1;
#ifdef MAC
else
error = mac_vnode_check_rename_to(td->td_ucred, tdvp,
tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd);
#endif
out:
if (error == 0) {
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
NDFREE(&fromnd, NDF_ONLY_PNBUF);
NDFREE(&tond, NDF_ONLY_PNBUF);
} else {
NDFREE(&fromnd, NDF_ONLY_PNBUF);
NDFREE(&tond, NDF_ONLY_PNBUF);
if (tvp != NULL)
vput(tvp);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
vn_finished_write(mp);
out1:
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
if (error == -1)
return (0);
return (error);
}
/*
* Make a directory file.
*/
#ifndef _SYS_SYSPROTO_H_
struct mkdir_args {
char *path;
int mode;
};
#endif
int
sys_mkdir(struct thread *td, struct mkdir_args *uap)
{
return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
uap->mode));
}
#ifndef _SYS_SYSPROTO_H_
struct mkdirat_args {
int fd;
char *path;
mode_t mode;
};
#endif
int
sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
{
return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode));
}
int
kern_mkdirat(struct thread *td, int fd, const char *path, enum uio_seg segflg,
int mode)
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
struct nameidata nd;
int error;
AUDIT_ARG_MODE(mode);
restart:
bwillwrite();
NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 |
NOCACHE, segflg, path, fd, &cap_mkdirat_rights,
td);
nd.ni_cnd.cn_flags |= WILLBEDIR;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
/*
* XXX namei called with LOCKPARENT but not LOCKLEAF has
* the strange behaviour of leaving the vnode unlocked
* if the target is the same vnode as the parent.
*/
if (vp == nd.ni_dvp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
#ifdef MAC
error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
&vattr);
if (error != 0)
goto out;
#endif
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
#ifdef MAC
out:
#endif
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if (error == 0)
vput(nd.ni_vp);
vn_finished_write(mp);
return (error);
}
/*
* Remove a directory file.
*/
#ifndef _SYS_SYSPROTO_H_
struct rmdir_args {
char *path;
};
#endif
int
sys_rmdir(struct thread *td, struct rmdir_args *uap)
{
return (kern_frmdirat(td, AT_FDCWD, uap->path, FD_NONE, UIO_USERSPACE,
0));
}
int
kern_frmdirat(struct thread *td, int dfd, const char *path, int fd,
enum uio_seg pathseg, int flag)
{
struct mount *mp;
struct vnode *vp;
struct file *fp;
struct nameidata nd;
cap_rights_t rights;
int error;
fp = NULL;
if (fd != FD_NONE) {
error = getvnode(td, fd, cap_rights_init(&rights, CAP_LOOKUP),
&fp);
if (error != 0)
return (error);
}
restart:
bwillwrite();
NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 |
((flag & AT_BENEATH) != 0 ? BENEATH : 0),
pathseg, path, dfd, &cap_unlinkat_rights, td);
if ((error = namei(&nd)) != 0)
goto fdout;
vp = nd.ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd.ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_vflag & VV_ROOT) {
error = EBUSY;
goto out;
}
if (fp != NULL && fp->f_vnode != vp) {
if (VN_IS_DOOMED(fp->f_vnode))
error = EBADF;
else
error = EDEADLK;
goto out;
}
#ifdef MAC
error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp,
&nd.ni_cnd);
if (error != 0)
goto out;
#endif
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
goto fdout;
goto restart;
}
vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK);
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
vn_finished_write(mp);
out:
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
fdout:
if (fp != NULL)
fdrop(fp, td);
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_FREEBSD11)
int
freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count,
long *basep, void (*func)(struct freebsd11_dirent *))
{
struct freebsd11_dirent dstdp;
struct dirent *dp, *edp;
char *dirbuf;
off_t base;
ssize_t resid, ucount;
int error;
/* XXX arbitrary sanity limit on `count'. */
count = min(count, 64 * 1024);
dirbuf = malloc(count, M_TEMP, M_WAITOK);
error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid,
UIO_SYSSPACE);
if (error != 0)
goto done;
if (basep != NULL)
*basep = base;
ucount = 0;
for (dp = (struct dirent *)dirbuf,
edp = (struct dirent *)&dirbuf[count - resid];
ucount < count && dp < edp; ) {
if (dp->d_reclen == 0)
break;
MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0));
if (dp->d_namlen >= sizeof(dstdp.d_name))
continue;
dstdp.d_type = dp->d_type;
dstdp.d_namlen = dp->d_namlen;
dstdp.d_fileno = dp->d_fileno; /* truncate */
if (dstdp.d_fileno != dp->d_fileno) {
switch (ino64_trunc_error) {
default:
case 0:
break;
case 1:
error = EOVERFLOW;
goto done;
case 2:
dstdp.d_fileno = UINT32_MAX;
break;
}
}
dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) +
((dp->d_namlen + 1 + 3) &~ 3);
bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
bzero(dstdp.d_name + dstdp.d_namlen,
dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) -
dstdp.d_namlen);
MPASS(dstdp.d_reclen <= dp->d_reclen);
MPASS(ucount + dstdp.d_reclen <= count);
if (func != NULL)
func(&dstdp);
error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen);
if (error != 0)
break;
dp = (struct dirent *)((char *)dp + dp->d_reclen);
ucount += dstdp.d_reclen;
}
done:
free(dirbuf, M_TEMP);
if (error == 0)
td->td_retval[0] = ucount;
return (error);
}
#endif /* COMPAT */
#ifdef COMPAT_43
static void
ogetdirentries_cvt(struct freebsd11_dirent *dp)
{
#if (BYTE_ORDER == LITTLE_ENDIAN)
/*
* The expected low byte of dp->d_namlen is our dp->d_type.
* The high MBZ byte of dp->d_namlen is our dp->d_namlen.
*/
dp->d_type = dp->d_namlen;
dp->d_namlen = 0;
#else
/*
* The dp->d_type is the high byte of the expected dp->d_namlen,
* so must be zero'ed.
*/
dp->d_type = 0;
#endif
}
/*
* Read a block of directory entries in a filesystem independent format.
*/
#ifndef _SYS_SYSPROTO_H_
struct ogetdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
#endif
int
ogetdirentries(struct thread *td, struct ogetdirentries_args *uap)
{
long loff;
int error;
error = kern_ogetdirentries(td, uap, &loff);
if (error == 0)
error = copyout(&loff, uap->basep, sizeof(long));
return (error);
}
int
kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
long *ploff)
{
long base;
int error;
/* XXX arbitrary sanity limit on `count'. */
if (uap->count > 64 * 1024)
return (EINVAL);
error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
&base, ogetdirentries_cvt);
if (error == 0 && uap->basep != NULL)
error = copyout(&base, uap->basep, sizeof(long));
return (error);
}
#endif /* COMPAT_43 */
#if defined(COMPAT_FREEBSD11)
#ifndef _SYS_SYSPROTO_H_
struct freebsd11_getdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
#endif
int
freebsd11_getdirentries(struct thread *td,
struct freebsd11_getdirentries_args *uap)
{
long base;
int error;
error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count,
&base, NULL);
if (error == 0 && uap->basep != NULL)
error = copyout(&base, uap->basep, sizeof(long));
return (error);
}
int
freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap)
{
struct freebsd11_getdirentries_args ap;
ap.fd = uap->fd;
ap.buf = uap->buf;
ap.count = uap->count;
ap.basep = NULL;
return (freebsd11_getdirentries(td, &ap));
}
#endif /* COMPAT_FREEBSD11 */
/*
* Read a block of directory entries in a filesystem independent format.
*/
int
sys_getdirentries(struct thread *td, struct getdirentries_args *uap)
{
off_t base;
int error;
error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base,
NULL, UIO_USERSPACE);
if (error != 0)
return (error);
if (uap->basep != NULL)
error = copyout(&base, uap->basep, sizeof(off_t));
return (error);
}
int
kern_getdirentries(struct thread *td, int fd, char *buf, size_t count,
off_t *basep, ssize_t *residp, enum uio_seg bufseg)
{
struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
off_t loff;
int error, eofflag;
off_t foffset;
AUDIT_ARG_FD(fd);
if (count > IOSIZE_MAX)
return (EINVAL);
auio.uio_resid = count;
error = getvnode(td, fd, &cap_read_rights, &fp);
if (error != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
vp = fp->f_vnode;
foffset = foffset_lock(fp, 0);
unionread:
if (vp->v_type != VDIR) {
error = EINVAL;
goto fail;
}
aiov.iov_base = buf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = bufseg;
auio.uio_td = td;
vn_lock(vp, LK_SHARED | LK_RETRY);
AUDIT_ARG_VNODE1(vp);
loff = auio.uio_offset = foffset;
#ifdef MAC
error = mac_vnode_check_readdir(td->td_ucred, vp);
if (error == 0)
#endif
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL,
NULL);
foffset = auio.uio_offset;
if (error != 0) {
VOP_UNLOCK(vp);
goto fail;
}
if (count == auio.uio_resid &&
(vp->v_vflag & VV_ROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_vnode = vp;
fp->f_data = vp;
foffset = 0;
vput(tvp);
goto unionread;
}
VOP_UNLOCK(vp);
*basep = loff;
if (residp != NULL)
*residp = auio.uio_resid;
td->td_retval[0] = count - auio.uio_resid;
fail:
foffset_unlock(fp, foffset, 0);
fdrop(fp, td);
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
#ifndef _SYS_SYSPROTO_H_
struct umask_args {
int newmask;
};
#endif
int
sys_umask(struct thread *td, struct umask_args *uap)
{
struct filedesc *fdp;
fdp = td->td_proc->p_fd;
FILEDESC_XLOCK(fdp);
td->td_retval[0] = fdp->fd_cmask;
fdp->fd_cmask = uap->newmask & ALLPERMS;
FILEDESC_XUNLOCK(fdp);
return (0);
}
/*
* Void all references to file by ripping underlying filesystem away from
* vnode.
*/
#ifndef _SYS_SYSPROTO_H_
struct revoke_args {
char *path;
};
#endif
int
sys_revoke(struct thread *td, struct revoke_args *uap)
{
struct vnode *vp;
struct vattr vattr;
struct nameidata nd;
int error;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE,
uap->path, td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp->v_type != VCHR || vp->v_rdev == NULL) {
error = EINVAL;
goto out;
}
#ifdef MAC
error = mac_vnode_check_revoke(td->td_ucred, vp);
if (error != 0)
goto out;
#endif
error = VOP_GETATTR(vp, &vattr, td->td_ucred);
if (error != 0)
goto out;
if (td->td_ucred->cr_uid != vattr.va_uid) {
error = priv_check(td, PRIV_VFS_ADMIN);
if (error != 0)
goto out;
}
if (vp->v_usecount > 1 || vcount(vp) > 1)
VOP_REVOKE(vp, REVOKEALL);
out:
vput(vp);
return (error);
}
/*
* Convert a user file descriptor to a kernel file entry and check that, if it
* is a capability, the correct rights are present. A reference on the file
* entry is held upon returning.
*/
int
getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
{
struct file *fp;
int error;
error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL);
if (error != 0)
return (error);
/*
* The file could be not of the vnode type, or it may be not
* yet fully initialized, in which case the f_vnode pointer
* may be set, but f_ops is still badfileops. E.g.,
* devfs_open() transiently create such situation to
* facilitate csw d_fdopen().
*
* Dupfdopen() handling in kern_openat() installs the
* half-baked file into the process descriptor table, allowing
* other thread to dereference it. Guard against the race by
* checking f_ops.
*/
if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
fdrop(fp, td);
return (EINVAL);
}
*fpp = fp;
return (0);
}
/*
* Get an (NFS) file handle.
*/
#ifndef _SYS_SYSPROTO_H_
struct lgetfh_args {
char *fname;
fhandle_t *fhp;
};
#endif
int
sys_lgetfh(struct thread *td, struct lgetfh_args *uap)
{
return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname,
UIO_USERSPACE, uap->fhp));
}
#ifndef _SYS_SYSPROTO_H_
struct getfh_args {
char *fname;
fhandle_t *fhp;
};
#endif
int
sys_getfh(struct thread *td, struct getfh_args *uap)
{
return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE,
uap->fhp));
}
/*
* syscall for the rpc.lockd to use to translate an open descriptor into
* a NFS file handle.
*
* warning: do not remove the priv_check() call or this becomes one giant
* security hole.
*/
#ifndef _SYS_SYSPROTO_H_
struct getfhat_args {
int fd;
char *path;
fhandle_t *fhp;
int flags;
};
#endif
int
sys_getfhat(struct thread *td, struct getfhat_args *uap)
{
if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_BENEATH)) != 0)
return (EINVAL);
return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE,
uap->fhp));
}
static int
kern_getfhat(struct thread *td, int flags, int fd, const char *path,
enum uio_seg pathseg, fhandle_t *fhp)
{
struct nameidata nd;
fhandle_t fh;
struct vnode *vp;
int error;
error = priv_check(td, PRIV_VFS_GETFH);
if (error != 0)
return (error);
NDINIT_AT(&nd, LOOKUP, ((flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW :
FOLLOW) | ((flags & AT_BENEATH) != 0 ? BENEATH : 0) | LOCKLEAF |
AUDITVNODE1, pathseg, path, fd, td);
error = namei(&nd);
if (error != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
bzero(&fh, sizeof(fh));
fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(vp, &fh.fh_fid);
vput(vp);
if (error == 0)
error = copyout(&fh, fhp, sizeof (fh));
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct fhlink_args {
fhandle_t *fhp;
const char *to;
};
#endif
int
sys_fhlink(struct thread *td, struct fhlink_args *uap)
{
return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp));
}
#ifndef _SYS_SYSPROTO_H_
struct fhlinkat_args {
fhandle_t *fhp;
int tofd;
const char *to;
};
#endif
int
sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap)
{
return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp));
}
static int
kern_fhlinkat(struct thread *td, int fd, const char *path,
enum uio_seg pathseg, fhandle_t *fhp)
{
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
error = priv_check(td, PRIV_VFS_GETFH);
if (error != 0)
return (error);
error = copyin(fhp, &fh, sizeof(fh));
if (error != 0)
return (error);
do {
bwillwrite();
if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
vfs_unbusy(mp);
if (error != 0)
return (error);
VOP_UNLOCK(vp);
} while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN);
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct fhreadlink_args {
fhandle_t *fhp;
char *buf;
size_t bufsize;
};
#endif
int
sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap)
{
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
error = priv_check(td, PRIV_VFS_GETFH);
if (error != 0)
return (error);
if (uap->bufsize > IOSIZE_MAX)
return (EINVAL);
error = copyin(uap->fhp, &fh, sizeof(fh));
if (error != 0)
return (error);
if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp);
vfs_unbusy(mp);
if (error != 0)
return (error);
error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td);
vput(vp);
return (error);
}
/*
* syscall for the rpc.lockd to use to translate a NFS file handle into an
* open descriptor.
*
* warning: do not remove the priv_check() call or this becomes one giant
* security hole.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhopen_args {
const struct fhandle *u_fhp;
int flags;
};
#endif
int
sys_fhopen(struct thread *td, struct fhopen_args *uap)
{
struct mount *mp;
struct vnode *vp;
struct fhandle fhp;
struct file *fp;
int fmode, error;
int indx;
error = priv_check(td, PRIV_VFS_FHOPEN);
if (error != 0)
return (error);
indx = -1;
fmode = FFLAGS(uap->flags);
/* why not allow a non-read/write open for our lockd? */
if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
return (EINVAL);
error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
if (error != 0)
return(error);
/* find the mount point */
mp = vfs_busyfs(&fhp.fh_fsid);
if (mp == NULL)
return (ESTALE);
/* now give me my vnode, it gets returned to me locked */
error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
vfs_unbusy(mp);
if (error != 0)
return (error);
error = falloc_noinstall(td, &fp);
if (error != 0) {
vput(vp);
return (error);
}
/*
* An extra reference on `fp' has been held for us by
* falloc_noinstall().
*/
#ifdef INVARIANTS
td->td_dupfd = -1;
#endif
error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
if (error != 0) {
KASSERT(fp->f_ops == &badfileops,
("VOP_OPEN in fhopen() set f_ops"));
KASSERT(td->td_dupfd < 0,
("fhopen() encountered fdopen()"));
vput(vp);
goto bad;
}
#ifdef INVARIANTS
td->td_dupfd = 0;
#endif
fp->f_vnode = vp;
fp->f_seqcount = 1;
finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
&vnops);
VOP_UNLOCK(vp);
if ((fmode & O_TRUNC) != 0) {
error = fo_truncate(fp, 0, td->td_ucred, td);
if (error != 0)
goto bad;
}
error = finstall(td, fp, &indx, fmode, NULL);
bad:
fdrop(fp, td);
td->td_retval[0] = indx;
return (error);
}
/*
* Stat an (NFS) file handle.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstat_args {
struct fhandle *u_fhp;
struct stat *sb;
};
#endif
int
sys_fhstat(struct thread *td, struct fhstat_args *uap)
{
struct stat sb;
struct fhandle fh;
int error;
error = copyin(uap->u_fhp, &fh, sizeof(fh));
if (error != 0)
return (error);
error = kern_fhstat(td, fh, &sb);
if (error == 0)
error = copyout(&sb, uap->sb, sizeof(sb));
return (error);
}
int
kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
{
struct mount *mp;
struct vnode *vp;
int error;
error = priv_check(td, PRIV_VFS_FHSTAT);
if (error != 0)
return (error);
if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
vfs_unbusy(mp);
if (error != 0)
return (error);
error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
vput(vp);
return (error);
}
/*
* Implement fstatfs() for (NFS) file handles.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstatfs_args {
struct fhandle *u_fhp;
struct statfs *buf;
};
#endif
int
sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap)
{
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)
error = copyout(sfp, uap->buf, sizeof(*sfp));
free(sfp, M_STATFS);
return (error);
}
int
kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
{
struct mount *mp;
struct vnode *vp;
int error;
error = priv_check(td, PRIV_VFS_FHSTATFS);
if (error != 0)
return (error);
if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
if (error != 0) {
vfs_unbusy(mp);
return (error);
}
vput(vp);
error = prison_canseemount(td->td_ucred, mp);
if (error != 0)
goto out;
#ifdef MAC
error = mac_mount_check_stat(td->td_ucred, mp);
if (error != 0)
goto out;
#endif
error = VFS_STATFS(mp, buf);
out:
vfs_unbusy(mp);
return (error);
}
/*
* Unlike madvise(2), we do not make a best effort to remember every
* possible caching hint. Instead, we remember the last setting with
* the exception that we will allow POSIX_FADV_NORMAL to adjust the
* region of any current setting.
*/
int
kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
int advice)
{
struct fadvise_info *fa, *new;
struct file *fp;
struct vnode *vp;
off_t end;
int error;
if (offset < 0 || len < 0 || offset > OFF_MAX - len)
return (EINVAL);
AUDIT_ARG_VALUE(advice);
switch (advice) {
case POSIX_FADV_SEQUENTIAL:
case POSIX_FADV_RANDOM:
case POSIX_FADV_NOREUSE:
new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
break;
case POSIX_FADV_NORMAL:
case POSIX_FADV_WILLNEED:
case POSIX_FADV_DONTNEED:
new = NULL;
break;
default:
return (EINVAL);
}
/* XXX: CAP_POSIX_FADVISE? */
AUDIT_ARG_FD(fd);
error = fget(td, fd, &cap_no_rights, &fp);
if (error != 0)
goto out;
AUDIT_ARG_FILE(td->td_proc, fp);
if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
error = ESPIPE;
goto out;
}
if (fp->f_type != DTYPE_VNODE) {
error = ENODEV;
goto out;
}
vp = fp->f_vnode;
if (vp->v_type != VREG) {
error = ENODEV;
goto out;
}
if (len == 0)
end = OFF_MAX;
else
end = offset + len - 1;
switch (advice) {
case POSIX_FADV_SEQUENTIAL:
case POSIX_FADV_RANDOM:
case POSIX_FADV_NOREUSE:
/*
* Try to merge any existing non-standard region with
* this new region if possible, otherwise create a new
* non-standard region for this request.
*/
mtx_pool_lock(mtxpool_sleep, fp);
fa = fp->f_advice;
if (fa != NULL && fa->fa_advice == advice &&
((fa->fa_start <= end && fa->fa_end >= offset) ||
(end != OFF_MAX && fa->fa_start == end + 1) ||
(fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
if (offset < fa->fa_start)
fa->fa_start = offset;
if (end > fa->fa_end)
fa->fa_end = end;
} else {
new->fa_advice = advice;
new->fa_start = offset;
new->fa_end = end;
fp->f_advice = new;
new = fa;
}
mtx_pool_unlock(mtxpool_sleep, fp);
break;
case POSIX_FADV_NORMAL:
/*
* If a the "normal" region overlaps with an existing
* non-standard region, trim or remove the
* non-standard region.
*/
mtx_pool_lock(mtxpool_sleep, fp);
fa = fp->f_advice;
if (fa != NULL) {
if (offset <= fa->fa_start && end >= fa->fa_end) {
new = fa;
fp->f_advice = NULL;
} else if (offset <= fa->fa_start &&
end >= fa->fa_start)
fa->fa_start = end + 1;
else if (offset <= fa->fa_end && end >= fa->fa_end)
fa->fa_end = offset - 1;
else if (offset >= fa->fa_start && end <= fa->fa_end) {
/*
* If the "normal" region is a middle
* portion of the existing
* non-standard region, just remove
* the whole thing rather than picking
* one side or the other to
* preserve.
*/
new = fa;
fp->f_advice = NULL;
}
}
mtx_pool_unlock(mtxpool_sleep, fp);
break;
case POSIX_FADV_WILLNEED:
case POSIX_FADV_DONTNEED:
error = VOP_ADVISE(vp, offset, end, advice);
break;
}
out:
if (fp != NULL)
fdrop(fp, td);
free(new, M_FADVISE);
return (error);
}
int
sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
{
int error;
error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
uap->advice);
return (kern_posix_error(td, error));
}
int
kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd,
off_t *outoffp, size_t len, unsigned int flags)
{
struct file *infp, *outfp;
struct vnode *invp, *outvp;
int error;
size_t retlen;
void *rl_rcookie, *rl_wcookie;
off_t savinoff, savoutoff;
infp = outfp = NULL;
rl_rcookie = rl_wcookie = NULL;
savinoff = -1;
error = 0;
retlen = 0;
if (flags != 0) {
error = EINVAL;
goto out;
}
if (len > SSIZE_MAX)
/*
* Although the len argument is size_t, the return argument
* is ssize_t (which is signed). Therefore a size that won't
* fit in ssize_t can't be returned.
*/
len = SSIZE_MAX;
/* Get the file structures for the file descriptors. */
error = fget_read(td, infd, &cap_read_rights, &infp);
if (error != 0)
goto out;
error = fget_write(td, outfd, &cap_write_rights, &outfp);
if (error != 0)
goto out;
/* Set the offset pointers to the correct place. */
if (inoffp == NULL)
inoffp = &infp->f_offset;
if (outoffp == NULL)
outoffp = &outfp->f_offset;
savinoff = *inoffp;
savoutoff = *outoffp;
invp = infp->f_vnode;
outvp = outfp->f_vnode;
/* Sanity check the f_flag bits. */
if ((outfp->f_flag & (FWRITE | FAPPEND)) != FWRITE ||
(infp->f_flag & FREAD) == 0) {
error = EBADF;
goto out;
}
/* If len == 0, just return 0. */
if (len == 0)
goto out;
/*
* If infp and outfp refer to the same file, the byte ranges cannot
* overlap.
*/
if (invp == outvp && ((savinoff <= savoutoff && savinoff + len >
savoutoff) || (savinoff > savoutoff && savoutoff + len >
savinoff))) {
error = EINVAL;
goto out;
}
/* Range lock the byte ranges for both invp and outvp. */
for (;;) {
rl_wcookie = vn_rangelock_wlock(outvp, *outoffp, *outoffp +
len);
rl_rcookie = vn_rangelock_tryrlock(invp, *inoffp, *inoffp +
len);
if (rl_rcookie != NULL)
break;
vn_rangelock_unlock(outvp, rl_wcookie);
rl_rcookie = vn_rangelock_rlock(invp, *inoffp, *inoffp + len);
vn_rangelock_unlock(invp, rl_rcookie);
}
retlen = len;
error = vn_copy_file_range(invp, inoffp, outvp, outoffp, &retlen,
flags, infp->f_cred, outfp->f_cred, td);
out:
if (rl_rcookie != NULL)
vn_rangelock_unlock(invp, rl_rcookie);
if (rl_wcookie != NULL)
vn_rangelock_unlock(outvp, rl_wcookie);
if (savinoff != -1 && (error == EINTR || error == ERESTART)) {
*inoffp = savinoff;
*outoffp = savoutoff;
}
if (outfp != NULL)
fdrop(outfp, td);
if (infp != NULL)
fdrop(infp, td);
td->td_retval[0] = retlen;
return (error);
}
int
sys_copy_file_range(struct thread *td, struct copy_file_range_args *uap)
{
off_t inoff, outoff, *inoffp, *outoffp;
int error;
inoffp = outoffp = NULL;
if (uap->inoffp != NULL) {
error = copyin(uap->inoffp, &inoff, sizeof(off_t));
if (error != 0)
return (error);
inoffp = &inoff;
}
if (uap->outoffp != NULL) {
error = copyin(uap->outoffp, &outoff, sizeof(off_t));
if (error != 0)
return (error);
outoffp = &outoff;
}
error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd,
outoffp, uap->len, uap->flags);
if (error == 0 && uap->inoffp != NULL)
error = copyout(inoffp, uap->inoffp, sizeof(off_t));
if (error == 0 && uap->outoffp != NULL)
error = copyout(outoffp, uap->outoffp, sizeof(off_t));
return (error);
}
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