File: [local] / src / sys / kern / vfs_syscalls.c (download)
Revision 1.365, Sat May 18 05:20:22 2024 UTC (3 weeks, 2 days ago) by guenther
Branch: MAIN
CVS Tags: HEAD
Changes since 1.364: +32 -5 lines
Add pathconfat(2): pathconf(2) but with at-fd and flags arguments,
the latter supporting the ability to get timestamp resolution of
symlinks.
ok deraadt@ millert@
|
/* $OpenBSD: vfs_syscalls.c,v 1.365 2024/05/18 05:20:22 guenther Exp $ */
/* $NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $ */
/*
* 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 8.28 (Berkeley) 12/10/94
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/lock.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/pledge.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/ktrace.h>
#include <sys/unistd.h>
#include <sys/specdev.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/syscallargs.h>
extern int suid_clear;
static int change_dir(struct nameidata *, struct proc *);
void checkdirs(struct vnode *);
int copyout_statfs(struct statfs *, void *, struct proc *);
int doopenat(struct proc *, int, const char *, int, mode_t, register_t *);
int domknodat(struct proc *, int, const char *, mode_t, dev_t);
int dolinkat(struct proc *, int, const char *, int, const char *, int);
int dosymlinkat(struct proc *, const char *, int, const char *);
int dounlinkat(struct proc *, int, const char *, int);
int dofaccessat(struct proc *, int, const char *, int, int);
int dofstatat(struct proc *, int, const char *, struct stat *, int);
int dopathconfat(struct proc *, int, const char *, int, int, register_t *);
int doreadlinkat(struct proc *, int, const char *, char *, size_t,
register_t *);
int dochflagsat(struct proc *, int, const char *, u_int, int);
int dovchflags(struct proc *, struct vnode *, u_int);
int dofchmodat(struct proc *, int, const char *, mode_t, int);
int dofchownat(struct proc *, int, const char *, uid_t, gid_t, int);
int dorenameat(struct proc *, int, const char *, int, const char *);
int domkdirat(struct proc *, int, const char *, mode_t);
int doutimensat(struct proc *, int, const char *, struct timespec [2], int);
int dovutimens(struct proc *, struct vnode *, struct timespec [2]);
int dofutimens(struct proc *, int, struct timespec [2]);
int dounmount_leaf(struct mount *, int, struct proc *);
/*
* Virtual File System System Calls
*/
/*
* Mount a file system.
*/
int
sys_mount(struct proc *p, void *v, register_t *retval)
{
struct sys_mount_args /* {
syscallarg(const char *) type;
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(void *) data;
} */ *uap = v;
struct vnode *vp;
struct mount *mp;
int error, mntflag = 0;
char fstypename[MFSNAMELEN];
char fspath[MNAMELEN];
struct nameidata nd;
struct vfsconf *vfsp;
int flags = SCARG(uap, flags);
void *args = NULL;
if ((error = suser(p)))
return (error);
/*
* Mount points must fit in MNAMELEN, not MAXPATHLEN.
*/
error = copyinstr(SCARG(uap, path), fspath, MNAMELEN, NULL);
if (error)
return(error);
/*
* Get vnode to be covered
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, p);
if ((error = namei(&nd)) != 0)
goto fail;
vp = nd.ni_vp;
if (flags & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
error = EINVAL;
goto fail;
}
mp = vp->v_mount;
vfsp = mp->mnt_vfc;
args = malloc(vfsp->vfc_datasize, M_TEMP, M_WAITOK | M_ZERO);
error = copyin(SCARG(uap, data), args, vfsp->vfc_datasize);
if (error) {
vput(vp);
goto fail;
}
mntflag = mp->mnt_flag;
/*
* We only allow the filesystem to be reloaded if it
* is currently mounted read-only.
*/
if ((flags & MNT_RELOAD) &&
((mp->mnt_flag & MNT_RDONLY) == 0)) {
vput(vp);
error = EOPNOTSUPP; /* Needs translation */
goto fail;
}
if ((error = vfs_busy(mp, VB_READ|VB_NOWAIT)) != 0) {
vput(vp);
goto fail;
}
mp->mnt_flag |= flags & (MNT_RELOAD | MNT_UPDATE);
goto update;
}
/*
* Do not allow disabling of permission checks unless exec and access to
* device files is disabled too.
*/
if ((flags & MNT_NOPERM) &&
(flags & (MNT_NODEV | MNT_NOEXEC)) != (MNT_NODEV | MNT_NOEXEC)) {
vput(vp);
error = EPERM;
goto fail;
}
if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, INFSLP)) != 0) {
vput(vp);
goto fail;
}
if (vp->v_type != VDIR) {
vput(vp);
goto fail;
}
error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL);
if (error) {
vput(vp);
goto fail;
}
vfsp = vfs_byname(fstypename);
if (vfsp == NULL) {
vput(vp);
error = EOPNOTSUPP;
goto fail;
}
args = malloc(vfsp->vfc_datasize, M_TEMP, M_WAITOK | M_ZERO);
error = copyin(SCARG(uap, data), args, vfsp->vfc_datasize);
if (error) {
vput(vp);
goto fail;
}
if (vp->v_mountedhere != NULL) {
vput(vp);
error = EBUSY;
goto fail;
}
/*
* Allocate and initialize the file system.
*/
mp = vfs_mount_alloc(vp, vfsp);
mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
update:
/* Ensure that the parent mountpoint does not get unmounted. */
error = vfs_busy(vp->v_mount, VB_READ|VB_NOWAIT|VB_DUPOK);
if (error) {
if (mp->mnt_flag & MNT_UPDATE) {
mp->mnt_flag = mntflag;
vfs_unbusy(mp);
} else {
vfs_unbusy(mp);
vfs_mount_free(mp);
}
vput(vp);
goto fail;
}
/*
* Set the mount level flags.
*/
if (flags & MNT_RDONLY)
mp->mnt_flag |= MNT_RDONLY;
else if (mp->mnt_flag & MNT_RDONLY)
mp->mnt_flag |= MNT_WANTRDWR;
mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_WXALLOWED | MNT_NODEV |
MNT_SYNCHRONOUS | MNT_ASYNC | MNT_NOATIME | MNT_NOPERM | MNT_FORCE);
mp->mnt_flag |= flags & (MNT_NOSUID | MNT_NOEXEC | MNT_WXALLOWED |
MNT_NODEV | MNT_SYNCHRONOUS | MNT_ASYNC | MNT_NOATIME | MNT_NOPERM |
MNT_FORCE);
/*
* Mount the filesystem.
*/
error = VFS_MOUNT(mp, fspath, args, &nd, p);
if (!error) {
mp->mnt_stat.f_ctime = gettime();
}
if (mp->mnt_flag & MNT_UPDATE) {
vfs_unbusy(vp->v_mount);
vput(vp);
if (mp->mnt_flag & MNT_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
mp->mnt_flag &= ~MNT_OP_FLAGS;
if (error)
mp->mnt_flag = mntflag;
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
if (mp->mnt_syncer == NULL)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vgone(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
vfs_unbusy(mp);
goto fail;
}
mp->mnt_flag &= ~MNT_OP_FLAGS;
vp->v_mountedhere = mp;
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
if (!error) {
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
checkdirs(vp);
vfs_unbusy(vp->v_mount);
VOP_UNLOCK(vp);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp);
(void) VFS_STATFS(mp, &mp->mnt_stat, p);
if ((error = VFS_START(mp, 0, p)) != 0)
vrele(vp);
} else {
mp->mnt_vnodecovered->v_mountedhere = NULL;
vfs_unbusy(mp);
vfs_mount_free(mp);
vfs_unbusy(vp->v_mount);
vput(vp);
}
fail:
if (args)
free(args, M_TEMP, vfsp->vfc_datasize);
return (error);
}
/*
* Scan all active processes to see if any of them have a current
* or root directory onto which the new filesystem has just been
* mounted. If so, replace them with the new mount point, keeping
* track of how many were replaced. That's the number of references
* the old vnode had that we've replaced, so finish by vrele()'ing
* it that many times. This puts off any possible sleeping until
* we've finished walking the allprocess list.
*/
void
checkdirs(struct vnode *olddp)
{
struct filedesc *fdp;
struct vnode *newdp;
struct process *pr;
u_int free_count = 0;
if (olddp->v_usecount == 1)
return;
if (VFS_ROOT(olddp->v_mountedhere, &newdp))
panic("mount: lost mount");
LIST_FOREACH(pr, &allprocess, ps_list) {
fdp = pr->ps_fd;
if (fdp->fd_cdir == olddp) {
free_count++;
vref(newdp);
fdp->fd_cdir = newdp;
}
if (fdp->fd_rdir == olddp) {
free_count++;
vref(newdp);
fdp->fd_rdir = newdp;
}
}
if (rootvnode == olddp) {
free_count++;
vref(newdp);
rootvnode = newdp;
}
while (free_count-- > 0)
vrele(olddp);
vput(newdp);
}
/*
* Unmount a file system.
*
* Note: unmount takes a path to the vnode mounted on as argument,
* not special file (as before).
*/
int
sys_unmount(struct proc *p, void *v, register_t *retval)
{
struct sys_unmount_args /* {
syscallarg(const char *) path;
syscallarg(int) flags;
} */ *uap = v;
struct vnode *vp;
struct mount *mp;
int error;
struct nameidata nd;
if ((error = suser(p)) != 0)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
mp = vp->v_mount;
/*
* Don't allow unmounting the root file system.
*/
if (mp->mnt_flag & MNT_ROOTFS) {
vput(vp);
return (EINVAL);
}
/*
* Must be the root of the filesystem
*/
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
vput(vp);
if (vfs_busy(mp, VB_WRITE|VB_WAIT))
return (EBUSY);
return (dounmount(mp, SCARG(uap, flags) & MNT_FORCE, p));
}
/*
* Do the actual file system unmount.
*/
int
dounmount(struct mount *mp, int flags, struct proc *p)
{
SLIST_HEAD(, mount) mplist;
struct mount *nmp;
int error;
SLIST_INIT(&mplist);
SLIST_INSERT_HEAD(&mplist, mp, mnt_dounmount);
/*
* Collect nested mount points. This takes advantage of the mount list
* being ordered - nested mount points come after their parent.
*/
while ((mp = TAILQ_NEXT(mp, mnt_list)) != NULL) {
SLIST_FOREACH(nmp, &mplist, mnt_dounmount) {
if (mp->mnt_vnodecovered == NULLVP ||
mp->mnt_vnodecovered->v_mount != nmp)
continue;
if ((flags & MNT_FORCE) == 0) {
error = EBUSY;
goto err;
}
error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK);
if (error) {
if ((flags & MNT_DOOMED)) {
/*
* If the mount point was busy due to
* being unmounted, it has been removed
* from the mount list already.
* Restart the iteration from the last
* collected busy entry.
*/
mp = SLIST_FIRST(&mplist);
break;
}
goto err;
}
SLIST_INSERT_HEAD(&mplist, mp, mnt_dounmount);
break;
}
}
/*
* Nested mount points cannot appear during this loop as mounting
* requires a read lock for the parent mount point.
*/
while ((mp = SLIST_FIRST(&mplist)) != NULL) {
SLIST_REMOVE(&mplist, mp, mount, mnt_dounmount);
error = dounmount_leaf(mp, flags, p);
if (error)
goto err;
}
return (0);
err:
while ((mp = SLIST_FIRST(&mplist)) != NULL) {
SLIST_REMOVE(&mplist, mp, mount, mnt_dounmount);
vfs_unbusy(mp);
}
return (error);
}
int
dounmount_leaf(struct mount *mp, int flags, struct proc *p)
{
struct vnode *coveredvp;
struct vnode *vp, *nvp;
int error;
int hadsyncer = 0;
mp->mnt_flag &=~ MNT_ASYNC;
cache_purgevfs(mp); /* remove cache entries for this file sys */
if (mp->mnt_syncer != NULL) {
hadsyncer = 1;
vgone(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
/*
* Before calling file system unmount, make sure
* all unveils to vnodes in here are dropped.
*/
TAILQ_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) {
unveil_removevnode(vp);
}
if (((mp->mnt_flag & MNT_RDONLY) ||
(error = VFS_SYNC(mp, MNT_WAIT, 0, p->p_ucred, p)) == 0) ||
(flags & MNT_FORCE))
error = VFS_UNMOUNT(mp, flags, p);
if (error && !(flags & MNT_DOOMED)) {
if ((mp->mnt_flag & MNT_RDONLY) == 0 && hadsyncer)
(void) vfs_allocate_syncvnode(mp);
vfs_unbusy(mp);
return (error);
}
TAILQ_REMOVE(&mountlist, mp, mnt_list);
if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
coveredvp->v_mountedhere = NULL;
vrele(coveredvp);
}
if (!TAILQ_EMPTY(&mp->mnt_vnodelist))
panic("unmount: dangling vnode");
vfs_unbusy(mp);
vfs_mount_free(mp);
return (0);
}
/*
* Sync each mounted filesystem.
*/
int
sys_sync(struct proc *p, void *v, register_t *retval)
{
struct mount *mp;
int asyncflag;
TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
if (vfs_busy(mp, VB_READ|VB_NOWAIT))
continue;
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
uvm_vnp_sync(mp);
VFS_SYNC(mp, MNT_NOWAIT, 0, p->p_ucred, p);
if (asyncflag)
mp->mnt_flag |= MNT_ASYNC;
}
vfs_unbusy(mp);
}
return (0);
}
/*
* Change filesystem quotas.
*/
int
sys_quotactl(struct proc *p, void *v, register_t *retval)
{
struct sys_quotactl_args /* {
syscallarg(const char *) path;
syscallarg(int) cmd;
syscallarg(int) uid;
syscallarg(char *) arg;
} */ *uap = v;
struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
vrele(nd.ni_vp);
return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
SCARG(uap, arg), p));
}
int
copyout_statfs(struct statfs *sp, void *uaddr, struct proc *p)
{
size_t co_sz1 = offsetof(struct statfs, f_fsid);
size_t co_off2 = co_sz1 + sizeof(fsid_t);
size_t co_sz2 = sizeof(struct statfs) - co_off2;
char *s, *d;
int error;
/* Don't let non-root see filesystem id (for NFS security) */
if (suser(p)) {
fsid_t fsid;
s = (char *)sp;
d = (char *)uaddr;
memset(&fsid, 0, sizeof(fsid));
if ((error = copyout(s, d, co_sz1)) != 0)
return (error);
if ((error = copyout(&fsid, d + co_sz1, sizeof(fsid))) != 0)
return (error);
return (copyout(s + co_off2, d + co_off2, co_sz2));
}
return (copyout(sp, uaddr, sizeof(*sp)));
}
/*
* Get filesystem statistics.
*/
int
sys_statfs(struct proc *p, void *v, register_t *retval)
{
struct sys_statfs_args /* {
syscallarg(const char *) path;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct mount *mp;
struct statfs *sp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | BYPASSUNVEIL, UIO_USERSPACE,
SCARG(uap, path), p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
vrele(nd.ni_vp);
if ((error = VFS_STATFS(mp, sp, p)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout_statfs(sp, SCARG(uap, buf), p));
}
/*
* Get filesystem statistics.
*/
int
sys_fstatfs(struct proc *p, void *v, register_t *retval)
{
struct sys_fstatfs_args /* {
syscallarg(int) fd;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct file *fp;
struct mount *mp;
struct statfs *sp;
int error;
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
if (!mp) {
FRELE(fp, p);
return (ENOENT);
}
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, p);
FRELE(fp, p);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout_statfs(sp, SCARG(uap, buf), p));
}
/*
* Get statistics on all filesystems.
*/
int
sys_getfsstat(struct proc *p, void *v, register_t *retval)
{
struct sys_getfsstat_args /* {
syscallarg(struct statfs *) buf;
syscallarg(size_t) bufsize;
syscallarg(int) flags;
} */ *uap = v;
struct mount *mp;
struct statfs *sp;
struct statfs *sfsp;
size_t count, maxcount;
int error, flags = SCARG(uap, flags);
maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
sfsp = SCARG(uap, buf);
count = 0;
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
if (vfs_busy(mp, VB_READ|VB_NOWAIT))
continue;
if (sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/* Refresh stats unless MNT_NOWAIT is specified */
if (flags != MNT_NOWAIT &&
flags != MNT_LAZY &&
(flags == MNT_WAIT ||
flags == 0) &&
(error = VFS_STATFS(mp, sp, p))) {
vfs_unbusy(mp);
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
#if notyet
if (mp->mnt_flag & MNT_SOFTDEP)
sp->f_eflags = STATFS_SOFTUPD;
#endif
error = (copyout_statfs(sp, sfsp, p));
if (error) {
vfs_unbusy(mp);
return (error);
}
sfsp++;
}
count++;
vfs_unbusy(mp);
}
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
return (0);
}
/*
* Change current working directory to a given file descriptor.
*/
int
sys_fchdir(struct proc *p, void *v, register_t *retval)
{
struct sys_fchdir_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct vnode *vp, *tdp, *old_cdir;
struct mount *mp;
struct file *fp;
int error;
if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
return (EBADF);
vp = fp->f_data;
if (fp->f_type != DTYPE_VNODE || vp->v_type != VDIR) {
FRELE(fp, p);
return (ENOTDIR);
}
vref(vp);
FRELE(fp, p);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
while (!error && (mp = vp->v_mountedhere) != NULL) {
if (vfs_busy(mp, VB_READ|VB_WAIT))
continue;
error = VFS_ROOT(mp, &tdp);
vfs_unbusy(mp);
if (error)
break;
vput(vp);
vp = tdp;
}
if (error) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp);
old_cdir = fdp->fd_cdir;
fdp->fd_cdir = vp;
vrele(old_cdir);
return (0);
}
/*
* Change current working directory (``.'').
*/
int
sys_chdir(struct proc *p, void *v, register_t *retval)
{
struct sys_chdir_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct vnode *old_cdir;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = change_dir(&nd, p)) != 0)
return (error);
old_cdir = fdp->fd_cdir;
fdp->fd_cdir = nd.ni_vp;
vrele(old_cdir);
return (0);
}
/*
* Change notion of root (``/'') directory.
*/
int
sys_chroot(struct proc *p, void *v, register_t *retval)
{
struct sys_chroot_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct vnode *old_cdir, *old_rdir;
int error;
struct nameidata nd;
if ((error = suser(p)) != 0)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = change_dir(&nd, p)) != 0)
return (error);
if (fdp->fd_rdir != NULL) {
/*
* A chroot() done inside a changed root environment does
* an automatic chdir to avoid the out-of-tree experience.
*/
vref(nd.ni_vp);
old_rdir = fdp->fd_rdir;
old_cdir = fdp->fd_cdir;
fdp->fd_rdir = fdp->fd_cdir = nd.ni_vp;
vrele(old_rdir);
vrele(old_cdir);
} else
fdp->fd_rdir = nd.ni_vp;
atomic_setbits_int(&p->p_p->ps_flags, PS_CHROOT);
return (0);
}
/*
* Common routine for chroot and chdir.
*/
static int
change_dir(struct nameidata *ndp, struct proc *p)
{
struct vnode *vp;
int error;
if ((error = namei(ndp)) != 0)
return (error);
vp = ndp->ni_vp;
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
if (error)
vput(vp);
else
VOP_UNLOCK(vp);
return (error);
}
int
sys___realpath(struct proc *p, void *v, register_t *retval)
{
struct sys___realpath_args /* {
syscallarg(const char *) pathname;
syscallarg(char *) resolved;
} */ *uap = v;
char *pathname;
char *rpbuf;
struct nameidata nd;
size_t pathlen;
int error = 0;
if (SCARG(uap, pathname) == NULL)
return (EINVAL);
pathname = pool_get(&namei_pool, PR_WAITOK);
rpbuf = pool_get(&namei_pool, PR_WAITOK);
if ((error = copyinstr(SCARG(uap, pathname), pathname, MAXPATHLEN,
&pathlen)))
goto end;
if (pathlen == 1) { /* empty string "" */
error = ENOENT;
goto end;
}
if (pathlen < 2) {
error = EINVAL;
goto end;
}
/* Get cwd for relative path if needed, prepend to rpbuf */
rpbuf[0] = '\0';
if (pathname[0] != '/') {
int cwdlen = MAXPATHLEN * 4; /* for vfs_getcwd_common */
char *cwdbuf, *bp;
cwdbuf = malloc(cwdlen, M_TEMP, M_WAITOK);
/* vfs_getcwd_common fills this in backwards */
bp = &cwdbuf[cwdlen - 1];
*bp = '\0';
error = vfs_getcwd_common(p->p_fd->fd_cdir, NULL, &bp, cwdbuf,
cwdlen/2, GETCWD_CHECK_ACCESS, p);
if (error) {
free(cwdbuf, M_TEMP, cwdlen);
goto end;
}
if (strlcpy(rpbuf, bp, MAXPATHLEN) >= MAXPATHLEN) {
free(cwdbuf, M_TEMP, cwdlen);
error = ENAMETOOLONG;
goto end;
}
free(cwdbuf, M_TEMP, cwdlen);
}
NDINIT(&nd, LOOKUP, FOLLOW | SAVENAME | REALPATH, UIO_SYSSPACE,
pathname, p);
nd.ni_cnd.cn_rpbuf = rpbuf;
nd.ni_cnd.cn_rpi = strlen(rpbuf);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
goto end;
/* release reference from namei */
if (nd.ni_vp)
vrele(nd.ni_vp);
error = copyoutstr(nd.ni_cnd.cn_rpbuf, SCARG(uap, resolved),
MAXPATHLEN, NULL);
#ifdef KTRACE
if (KTRPOINT(p, KTR_NAMEI))
ktrnamei(p, nd.ni_cnd.cn_rpbuf);
#endif
pool_put(&namei_pool, nd.ni_cnd.cn_pnbuf);
end:
pool_put(&namei_pool, rpbuf);
pool_put(&namei_pool, pathname);
return (error);
}
int
sys_unveil(struct proc *p, void *v, register_t *retval)
{
struct sys_unveil_args /* {
syscallarg(const char *) path;
syscallarg(const char *) permissions;
} */ *uap = v;
struct process *pr = p->p_p;
char *pathname, *c;
struct nameidata nd;
size_t pathlen;
char permissions[5];
int error, allow;
if (SCARG(uap, path) == NULL && SCARG(uap, permissions) == NULL) {
pr->ps_uvdone = 1;
return (0);
}
if (pr->ps_uvdone != 0)
return EPERM;
error = copyinstr(SCARG(uap, permissions), permissions,
sizeof(permissions), NULL);
if (error)
return (error);
pathname = pool_get(&namei_pool, PR_WAITOK);
error = copyinstr(SCARG(uap, path), pathname, MAXPATHLEN, &pathlen);
if (error)
goto end;
#ifdef KTRACE
if (KTRPOINT(p, KTR_STRUCT))
ktrstruct(p, "unveil", permissions, strlen(permissions));
#endif
if (pathlen < 2) {
error = EINVAL;
goto end;
}
/* find root "/" or "//" */
for (c = pathname; *c != '\0'; c++) {
if (*c != '/')
break;
}
if (*c == '\0')
/* root directory */
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | SAVENAME,
UIO_SYSSPACE, pathname, p);
else
NDINIT(&nd, CREATE, FOLLOW | LOCKLEAF | LOCKPARENT | SAVENAME,
UIO_SYSSPACE, pathname, p);
nd.ni_pledge = PLEDGE_UNVEIL;
if ((error = namei(&nd)) != 0)
goto end;
/*
* XXX Any access to the file or directory will allow us to
* pledge path it
*/
allow = ((nd.ni_vp &&
(VOP_ACCESS(nd.ni_vp, VREAD, p->p_ucred, p) == 0 ||
VOP_ACCESS(nd.ni_vp, VWRITE, p->p_ucred, p) == 0 ||
VOP_ACCESS(nd.ni_vp, VEXEC, p->p_ucred, p) == 0)) ||
(nd.ni_dvp &&
(VOP_ACCESS(nd.ni_dvp, VREAD, p->p_ucred, p) == 0 ||
VOP_ACCESS(nd.ni_dvp, VWRITE, p->p_ucred, p) == 0 ||
VOP_ACCESS(nd.ni_dvp, VEXEC, p->p_ucred, p) == 0)));
/* release lock from namei, but keep ref */
if (nd.ni_vp)
VOP_UNLOCK(nd.ni_vp);
if (nd.ni_dvp && nd.ni_dvp != nd.ni_vp)
VOP_UNLOCK(nd.ni_dvp);
if (allow)
error = unveil_add(p, &nd, permissions);
else
error = EPERM;
/* release vref from namei, but not vref from unveil_add */
if (nd.ni_vp)
vrele(nd.ni_vp);
if (nd.ni_dvp)
vrele(nd.ni_dvp);
pool_put(&namei_pool, nd.ni_cnd.cn_pnbuf);
end:
pool_put(&namei_pool, pathname);
return (error);
}
/*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_open(struct proc *p, void *v, register_t *retval)
{
struct sys_open_args /* {
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(mode_t) mode;
} */ *uap = v;
return (doopenat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, flags),
SCARG(uap, mode), retval));
}
int
sys_openat(struct proc *p, void *v, register_t *retval)
{
struct sys_openat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(int) flags;
syscallarg(mode_t) mode;
} */ *uap = v;
return (doopenat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, flags), SCARG(uap, mode), retval));
}
int
doopenat(struct proc *p, int fd, const char *path, int oflags, mode_t mode,
register_t *retval)
{
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
struct vattr vattr;
int flags, cloexec, cmode;
int type, indx, error, localtrunc = 0;
struct flock lf;
struct nameidata nd;
uint64_t ni_pledge = 0;
u_char ni_unveil = 0;
if (oflags & (O_EXLOCK | O_SHLOCK)) {
error = pledge_flock(p);
if (error != 0)
return (error);
}
cloexec = (oflags & O_CLOEXEC) ? UF_EXCLOSE : 0;
fdplock(fdp);
if ((error = falloc(p, &fp, &indx)) != 0) {
fdpunlock(fdp);
return (error);
}
fdpunlock(fdp);
flags = FFLAGS(oflags);
if (flags & FREAD) {
ni_pledge |= PLEDGE_RPATH;
ni_unveil |= UNVEIL_READ;
}
if (flags & FWRITE) {
ni_pledge |= PLEDGE_WPATH;
ni_unveil |= UNVEIL_WRITE;
}
if (oflags & O_CREAT) {
ni_pledge |= PLEDGE_CPATH;
ni_unveil |= UNVEIL_CREATE;
}
cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
if ((p->p_p->ps_flags & PS_PLEDGE))
cmode &= ACCESSPERMS;
NDINITAT(&nd, 0, 0, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = ni_pledge;
nd.ni_unveil = ni_unveil;
p->p_dupfd = -1; /* XXX check for fdopen */
if ((flags & O_TRUNC) && (flags & (O_EXLOCK | O_SHLOCK))) {
localtrunc = 1;
flags &= ~O_TRUNC; /* Must do truncate ourselves */
}
if ((error = vn_open(&nd, flags, cmode)) != 0) {
fdplock(fdp);
if (error == ENODEV &&
p->p_dupfd >= 0 && /* XXX from fdopen */
(error =
dupfdopen(p, indx, flags)) == 0) {
fdpunlock(fdp);
closef(fp, p);
*retval = indx;
return (error);
}
if (error == ERESTART)
error = EINTR;
fdremove(fdp, indx);
fdpunlock(fdp);
closef(fp, p);
return (error);
}
p->p_dupfd = 0;
vp = nd.ni_vp;
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = vp;
if (flags & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (flags & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((flags & FNONBLOCK) == 0)
type |= F_WAIT;
VOP_UNLOCK(vp);
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
if (error) {
fdplock(fdp);
/* closef will vn_close the file for us. */
fdremove(fdp, indx);
fdpunlock(fdp);
closef(fp, p);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
atomic_setbits_int(&fp->f_iflags, FIF_HASLOCK);
}
if (localtrunc) {
if ((fp->f_flag & FWRITE) == 0)
error = EACCES;
else if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_RDONLY))
error = EROFS;
else if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = 0;
error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
}
if (error) {
VOP_UNLOCK(vp);
fdplock(fdp);
/* closef will close the file for us. */
fdremove(fdp, indx);
fdpunlock(fdp);
closef(fp, p);
return (error);
}
}
VOP_UNLOCK(vp);
*retval = indx;
fdplock(fdp);
fdinsert(fdp, indx, cloexec, fp);
fdpunlock(fdp);
FRELE(fp, p);
return (error);
}
/*
* Open a new created file (in /tmp) suitable for mmaping.
*/
int
sys___tmpfd(struct proc *p, void *v, register_t *retval)
{
struct sys___tmpfd_args /* {
syscallarg(int) flags;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
int oflags = SCARG(uap, flags);
int flags, cloexec, cmode;
int indx, error;
unsigned int i;
struct nameidata nd;
char path[64];
static const char *letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-";
/* most flags are hardwired */
oflags = O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW | (oflags & O_CLOEXEC);
cloexec = (oflags & O_CLOEXEC) ? UF_EXCLOSE : 0;
fdplock(fdp);
if ((error = falloc(p, &fp, &indx)) != 0) {
fdpunlock(fdp);
return (error);
}
fdpunlock(fdp);
flags = FFLAGS(oflags);
arc4random_buf(path, sizeof(path));
memcpy(path, "/tmp/", 5);
for (i = 5; i < sizeof(path) - 1; i++)
path[i] = letters[(unsigned char)path[i] & 63];
path[sizeof(path)-1] = 0;
cmode = 0600;
NDINITAT(&nd, 0, KERNELPATH, UIO_SYSSPACE, AT_FDCWD, path, p);
if ((error = vn_open(&nd, flags, cmode)) != 0) {
if (error == ERESTART)
error = EINTR;
fdplock(fdp);
fdremove(fdp, indx);
fdpunlock(fdp);
closef(fp, p);
return (error);
}
vp = nd.ni_vp;
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = vp;
VOP_UNLOCK(vp);
*retval = indx;
fdplock(fdp);
fdinsert(fdp, indx, cloexec, fp);
fdpunlock(fdp);
FRELE(fp, p);
/* unlink it */
/* XXX
* there is a wee race here, although it is mostly inconsequential.
* perhaps someday we can create a file like object without a name...
*/
NDINITAT(&nd, DELETE, KERNELPATH | LOCKPARENT | LOCKLEAF, UIO_SYSSPACE,
AT_FDCWD, path, p);
if ((error = namei(&nd)) != 0) {
printf("can't unlink temp file! %d\n", error);
error = 0;
} else {
vp = nd.ni_vp;
uvm_vnp_uncache(vp);
error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
if (error) {
printf("error removing vop: %d\n", error);
error = 0;
}
}
return (error);
}
/*
* Get file handle system call
*/
int
sys_getfh(struct proc *p, void *v, register_t *retval)
{
struct sys_getfh_args /* {
syscallarg(const char *) fname;
syscallarg(fhandle_t *) fhp;
} */ *uap = v;
struct vnode *vp;
fhandle_t fh;
int error;
struct nameidata nd;
/*
* Must be super user
*/
error = suser(p);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, fname), p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
memset(&fh, 0, sizeof(fh));
fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VFS_VPTOFH(vp, &fh.fh_fid);
vput(vp);
if (error)
return (error);
error = copyout(&fh, SCARG(uap, fhp), sizeof(fh));
return (error);
}
/*
* Open a file given a file handle.
*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
int
sys_fhopen(struct proc *p, void *v, register_t *retval)
{
struct sys_fhopen_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(int) flags;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp = NULL;
struct mount *mp;
struct ucred *cred = p->p_ucred;
int flags, cloexec;
int type, indx, error=0;
struct flock lf;
struct vattr va;
fhandle_t fh;
/*
* Must be super user
*/
if ((error = suser(p)))
return (error);
flags = FFLAGS(SCARG(uap, flags));
if ((flags & (FREAD | FWRITE)) == 0)
return (EINVAL);
if ((flags & O_CREAT))
return (EINVAL);
cloexec = (flags & O_CLOEXEC) ? UF_EXCLOSE : 0;
fdplock(fdp);
if ((error = falloc(p, &fp, &indx)) != 0) {
fdpunlock(fdp);
fp = NULL;
goto bad;
}
fdpunlock(fdp);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
goto bad;
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
error = ESTALE;
goto bad;
}
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) {
vp = NULL; /* most likely unnecessary sanity for bad: */
goto bad;
}
/* Now do an effective vn_open */
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
if ((flags & O_DIRECTORY) && vp->v_type != VDIR) {
error = ENOTDIR;
goto bad;
}
if (flags & FREAD) {
if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0)
goto bad;
}
if (flags & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
error = EISDIR;
goto bad;
}
if ((error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0 ||
(error = vn_writechk(vp)) != 0)
goto bad;
}
if (flags & O_TRUNC) {
VATTR_NULL(&va);
va.va_size = 0;
if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0)
goto bad;
}
if ((error = VOP_OPEN(vp, flags, cred, p)) != 0)
goto bad;
if (flags & FWRITE)
vp->v_writecount++;
/* done with modified vn_open, now finish what sys_open does. */
fp->f_flag = flags & FMASK;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = vp;
if (flags & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (flags & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((flags & FNONBLOCK) == 0)
type |= F_WAIT;
VOP_UNLOCK(vp);
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
if (error) {
vp = NULL; /* closef will vn_close the file */
goto bad;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
atomic_setbits_int(&fp->f_iflags, FIF_HASLOCK);
}
VOP_UNLOCK(vp);
*retval = indx;
fdplock(fdp);
fdinsert(fdp, indx, cloexec, fp);
fdpunlock(fdp);
FRELE(fp, p);
return (0);
bad:
if (fp) {
fdplock(fdp);
fdremove(fdp, indx);
fdpunlock(fdp);
closef(fp, p);
if (vp != NULL)
vput(vp);
}
return (error);
}
int
sys_fhstat(struct proc *p, void *v, register_t *retval)
{
struct sys_fhstat_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(struct stat *) sb;
} */ *uap = v;
struct stat sb;
int error;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
/*
* Must be super user
*/
if ((error = suser(p)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
error = vn_stat(vp, &sb, p);
vput(vp);
if (error)
return (error);
error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
return (error);
}
int
sys_fhstatfs(struct proc *p, void *v, register_t *retval)
{
struct sys_fhstatfs_args /* {
syscallarg(const fhandle_t *) fhp;
syscallarg(struct statfs *) buf;
} */ *uap = v;
struct statfs *sp;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
if ((error = suser(p)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
mp = vp->v_mount;
sp = &mp->mnt_stat;
vput(vp);
if ((error = VFS_STATFS(mp, sp, p)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
return (copyout(sp, SCARG(uap, buf), sizeof(*sp)));
}
/*
* Create a special file or named pipe.
*/
int
sys_mknod(struct proc *p, void *v, register_t *retval)
{
struct sys_mknod_args /* {
syscallarg(const char *) path;
syscallarg(mode_t) mode;
syscallarg(int) dev;
} */ *uap = v;
return (domknodat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode),
SCARG(uap, dev)));
}
int
sys_mknodat(struct proc *p, void *v, register_t *retval)
{
struct sys_mknodat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(mode_t) mode;
syscallarg(dev_t) dev;
} */ *uap = v;
return (domknodat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, mode), SCARG(uap, dev)));
}
int
domknodat(struct proc *p, int fd, const char *path, mode_t mode, dev_t dev)
{
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
if (dev == VNOVAL)
return (EINVAL);
NDINITAT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_DPATH;
nd.ni_unveil = UNVEIL_CREATE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (!S_ISFIFO(mode) || dev != 0) {
if (!vnoperm(nd.ni_dvp) && (error = suser(p)) != 0)
goto out;
if (p->p_fd->fd_rdir) {
error = EINVAL;
goto out;
}
}
if (vp != NULL)
error = EEXIST;
else {
VATTR_NULL(&vattr);
vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
if ((p->p_p->ps_flags & PS_PLEDGE))
vattr.va_mode &= ACCESSPERMS;
vattr.va_rdev = dev;
switch (mode & S_IFMT) {
case S_IFMT: /* used by badsect to flag bad sectors */
vattr.va_type = VBAD;
break;
case S_IFCHR:
vattr.va_type = VCHR;
break;
case S_IFBLK:
vattr.va_type = VBLK;
break;
case S_IFIFO:
#ifndef FIFO
error = EOPNOTSUPP;
break;
#else
if (dev == 0) {
vattr.va_type = VFIFO;
break;
}
/* FALLTHROUGH */
#endif /* FIFO */
default:
error = EINVAL;
break;
}
}
out:
if (!error) {
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
vput(nd.ni_dvp);
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (vp)
vrele(vp);
}
return (error);
}
/*
* Create a named pipe.
*/
int
sys_mkfifo(struct proc *p, void *v, register_t *retval)
{
struct sys_mkfifo_args /* {
syscallarg(const char *) path;
syscallarg(mode_t) mode;
} */ *uap = v;
return (domknodat(p, AT_FDCWD, SCARG(uap, path),
(SCARG(uap, mode) & ALLPERMS) | S_IFIFO, 0));
}
int
sys_mkfifoat(struct proc *p, void *v, register_t *retval)
{
struct sys_mkfifoat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(mode_t) mode;
} */ *uap = v;
return (domknodat(p, SCARG(uap, fd), SCARG(uap, path),
(SCARG(uap, mode) & ALLPERMS) | S_IFIFO, 0));
}
/*
* Make a hard file link.
*/
int
sys_link(struct proc *p, void *v, register_t *retval)
{
struct sys_link_args /* {
syscallarg(const char *) path;
syscallarg(const char *) link;
} */ *uap = v;
return (dolinkat(p, AT_FDCWD, SCARG(uap, path), AT_FDCWD,
SCARG(uap, link), AT_SYMLINK_FOLLOW));
}
int
sys_linkat(struct proc *p, void *v, register_t *retval)
{
struct sys_linkat_args /* {
syscallarg(int) fd1;
syscallarg(const char *) path1;
syscallarg(int) fd2;
syscallarg(const char *) path2;
syscallarg(int) flag;
} */ *uap = v;
return (dolinkat(p, SCARG(uap, fd1), SCARG(uap, path1),
SCARG(uap, fd2), SCARG(uap, path2), SCARG(uap, flag)));
}
int
dolinkat(struct proc *p, int fd1, const char *path1, int fd2,
const char *path2, int flag)
{
struct vnode *vp;
struct nameidata nd;
int error, follow;
if (flag & ~AT_SYMLINK_FOLLOW)
return (EINVAL);
follow = (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW;
NDINITAT(&nd, LOOKUP, follow, UIO_USERSPACE, fd1, path1, p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type == VDIR) {
error = EPERM;
goto out;
}
NDINITAT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, fd2, path2, p);
nd.ni_pledge = PLEDGE_CPATH;
nd.ni_unveil = UNVEIL_CREATE;
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
/* No cross-mount links! */
if (nd.ni_dvp->v_mount != vp->v_mount) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
error = EXDEV;
goto out;
}
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
out:
vrele(vp);
return (error);
}
/*
* Make a symbolic link.
*/
int
sys_symlink(struct proc *p, void *v, register_t *retval)
{
struct sys_symlink_args /* {
syscallarg(const char *) path;
syscallarg(const char *) link;
} */ *uap = v;
return (dosymlinkat(p, SCARG(uap, path), AT_FDCWD, SCARG(uap, link)));
}
int
sys_symlinkat(struct proc *p, void *v, register_t *retval)
{
struct sys_symlinkat_args /* {
syscallarg(const char *) path;
syscallarg(int) fd;
syscallarg(const char *) link;
} */ *uap = v;
return (dosymlinkat(p, SCARG(uap, path), SCARG(uap, fd),
SCARG(uap, link)));
}
int
dosymlinkat(struct proc *p, const char *upath, int fd, const char *link)
{
struct vattr vattr;
char *path;
int error;
struct nameidata nd;
path = pool_get(&namei_pool, PR_WAITOK);
error = copyinstr(upath, path, MAXPATHLEN, NULL);
if (error)
goto out;
NDINITAT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, fd, link, p);
nd.ni_pledge = PLEDGE_CPATH;
nd.ni_unveil = UNVEIL_CREATE;
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
VATTR_NULL(&vattr);
vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask;
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
out:
pool_put(&namei_pool, path);
return (error);
}
/*
* Delete a name from the filesystem.
*/
int
sys_unlink(struct proc *p, void *v, register_t *retval)
{
struct sys_unlink_args /* {
syscallarg(const char *) path;
} */ *uap = v;
return (dounlinkat(p, AT_FDCWD, SCARG(uap, path), 0));
}
int
sys_unlinkat(struct proc *p, void *v, register_t *retval)
{
struct sys_unlinkat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(int) flag;
} */ *uap = v;
return (dounlinkat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, flag)));
}
int
dounlinkat(struct proc *p, int fd, const char *path, int flag)
{
struct vnode *vp;
int error;
struct nameidata nd;
if (flag & ~AT_REMOVEDIR)
return (EINVAL);
NDINITAT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
fd, path, p);
nd.ni_pledge = PLEDGE_CPATH;
nd.ni_unveil = UNVEIL_CREATE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (flag & AT_REMOVEDIR) {
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd.ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* A mounted on directory cannot be deleted.
*/
if (vp->v_mountedhere != NULL) {
error = EBUSY;
goto out;
}
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT)
error = EBUSY;
out:
if (!error) {
if (flag & AT_REMOVEDIR) {
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
} else {
(void)uvm_vnp_uncache(vp);
error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
}
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
}
return (error);
}
/*
* Reposition read/write file offset.
*/
int
sys_lseek(struct proc *p, void *v, register_t *retval)
{
struct sys_lseek_args /* {
syscallarg(int) fd;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
off_t offset;
int error;
if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
return (EBADF);
if (fp->f_ops->fo_seek == NULL) {
error = ESPIPE;
goto bad;
}
offset = SCARG(uap, offset);
error = (*fp->f_ops->fo_seek)(fp, &offset, SCARG(uap, whence), p);
if (error)
goto bad;
*(off_t *)retval = offset;
mtx_enter(&fp->f_mtx);
fp->f_seek++;
mtx_leave(&fp->f_mtx);
error = 0;
bad:
FRELE(fp, p);
return (error);
}
/*
* Check access permissions.
*/
int
sys_access(struct proc *p, void *v, register_t *retval)
{
struct sys_access_args /* {
syscallarg(const char *) path;
syscallarg(int) amode;
} */ *uap = v;
return (dofaccessat(p, AT_FDCWD, SCARG(uap, path),
SCARG(uap, amode), 0));
}
int
sys_faccessat(struct proc *p, void *v, register_t *retval)
{
struct sys_faccessat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(int) amode;
syscallarg(int) flag;
} */ *uap = v;
return (dofaccessat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, amode), SCARG(uap, flag)));
}
int
dofaccessat(struct proc *p, int fd, const char *path, int amode, int flag)
{
struct vnode *vp;
struct ucred *newcred, *oldcred;
struct nameidata nd;
int error;
if (amode & ~(R_OK | W_OK | X_OK))
return (EINVAL);
if (flag & ~AT_EACCESS)
return (EINVAL);
newcred = NULL;
oldcred = p->p_ucred;
/*
* If access as real ids was requested and they really differ,
* give the thread new creds with them reset
*/
if ((flag & AT_EACCESS) == 0 &&
(oldcred->cr_uid != oldcred->cr_ruid ||
(oldcred->cr_gid != oldcred->cr_rgid))) {
p->p_ucred = newcred = crdup(oldcred);
newcred->cr_uid = newcred->cr_ruid;
newcred->cr_gid = newcred->cr_rgid;
}
NDINITAT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
goto out;
vp = nd.ni_vp;
/* Flags == 0 means only check for existence. */
if (amode) {
int vflags = 0;
if (amode & R_OK)
vflags |= VREAD;
if (amode & W_OK)
vflags |= VWRITE;
if (amode & X_OK)
vflags |= VEXEC;
error = VOP_ACCESS(vp, vflags, p->p_ucred, p);
if (!error && (vflags & VWRITE))
error = vn_writechk(vp);
}
vput(vp);
out:
if (newcred != NULL) {
p->p_ucred = oldcred;
crfree(newcred);
}
return (error);
}
/*
* Get file status; this version follows links.
*/
int
sys_stat(struct proc *p, void *v, register_t *retval)
{
struct sys_stat_args /* {
syscallarg(const char *) path;
syscallarg(struct stat *) ub;
} */ *uap = v;
return (dofstatat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, ub), 0));
}
int
sys_fstatat(struct proc *p, void *v, register_t *retval)
{
struct sys_fstatat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(struct stat *) buf;
syscallarg(int) flag;
} */ *uap = v;
return (dofstatat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, buf), SCARG(uap, flag)));
}
int
dofstatat(struct proc *p, int fd, const char *path, struct stat *buf, int flag)
{
struct stat sb;
int error, follow;
struct nameidata nd;
if (flag & ~AT_SYMLINK_NOFOLLOW)
return (EINVAL);
follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
NDINITAT(&nd, LOOKUP, follow | LOCKLEAF, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
/* Don't let non-root see generation numbers (for NFS security) */
if (suser(p))
sb.st_gen = 0;
error = copyout(&sb, buf, sizeof(sb));
#ifdef KTRACE
if (error == 0 && KTRPOINT(p, KTR_STRUCT))
ktrstat(p, &sb);
#endif
return (error);
}
/*
* Get file status; this version does not follow links.
*/
int
sys_lstat(struct proc *p, void *v, register_t *retval)
{
struct sys_lstat_args /* {
syscallarg(const char *) path;
syscallarg(struct stat *) ub;
} */ *uap = v;
return (dofstatat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, ub),
AT_SYMLINK_NOFOLLOW));
}
/*
* Get configurable pathname variables.
*/
int
sys_pathconf(struct proc *p, void *v, register_t *retval)
{
struct sys_pathconf_args /* {
syscallarg(const char *) path;
syscallarg(int) name;
} */ *uap = v;
return dopathconfat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, name),
0, retval);
}
int
sys_pathconfat(struct proc *p, void *v, register_t *retval)
{
struct sys_pathconfat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(int) name;
syscallarg(int) flag;
} */ *uap = v;
return dopathconfat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, name), SCARG(uap, flag), retval);
}
int
dopathconfat(struct proc *p, int fd, const char *path, int name, int flag,
register_t *retval)
{
int follow, error;
struct nameidata nd;
if (flag & ~AT_SYMLINK_NOFOLLOW)
return EINVAL;
follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
NDINITAT(&nd, LOOKUP, follow | LOCKLEAF, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
return (error);
error = VOP_PATHCONF(nd.ni_vp, name, retval);
vput(nd.ni_vp);
return (error);
}
/*
* Return target name of a symbolic link.
*/
int
sys_readlink(struct proc *p, void *v, register_t *retval)
{
struct sys_readlink_args /* {
syscallarg(const char *) path;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
return (doreadlinkat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, buf),
SCARG(uap, count), retval));
}
int
sys_readlinkat(struct proc *p, void *v, register_t *retval)
{
struct sys_readlinkat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
return (doreadlinkat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, buf), SCARG(uap, count), retval));
}
int
doreadlinkat(struct proc *p, int fd, const char *path, char *buf,
size_t count, register_t *retval)
{
struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
NDINITAT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VLNK)
error = EINVAL;
else {
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 = UIO_USERSPACE;
auio.uio_procp = p;
auio.uio_resid = count;
error = VOP_READLINK(vp, &auio, p->p_ucred);
*retval = count - auio.uio_resid;
}
vput(vp);
return (error);
}
/*
* Change flags of a file given a path name.
*/
int
sys_chflags(struct proc *p, void *v, register_t *retval)
{
struct sys_chflags_args /* {
syscallarg(const char *) path;
syscallarg(u_int) flags;
} */ *uap = v;
return (dochflagsat(p, AT_FDCWD, SCARG(uap, path),
SCARG(uap, flags), 0));
}
int
sys_chflagsat(struct proc *p, void *v, register_t *retval)
{
struct sys_chflagsat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(u_int) flags;
syscallarg(int) atflags;
} */ *uap = v;
return (dochflagsat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, flags), SCARG(uap, atflags)));
}
int
dochflagsat(struct proc *p, int fd, const char *path, u_int flags, int atflags)
{
struct nameidata nd;
int error, follow;
if (atflags & ~AT_SYMLINK_NOFOLLOW)
return (EINVAL);
follow = (atflags & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
NDINITAT(&nd, LOOKUP, follow, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_FATTR | PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_WRITE;
if ((error = namei(&nd)) != 0)
return (error);
return (dovchflags(p, nd.ni_vp, flags));
}
/*
* Change flags of a file given a file descriptor.
*/
int
sys_fchflags(struct proc *p, void *v, register_t *retval)
{
struct sys_fchflags_args /* {
syscallarg(int) fd;
syscallarg(u_int) flags;
} */ *uap = v;
struct file *fp;
struct vnode *vp;
int error;
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = fp->f_data;
vref(vp);
FRELE(fp, p);
return (dovchflags(p, vp, SCARG(uap, flags)));
}
int
dovchflags(struct proc *p, struct vnode *vp, u_int flags)
{
struct vattr vattr;
int error;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount && vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else if (flags == VNOVAL)
error = EINVAL;
else {
if (suser(p)) {
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
!= 0)
goto out;
if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
error = EINVAL;
goto out;
}
}
VATTR_NULL(&vattr);
vattr.va_flags = flags;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
vput(vp);
return (error);
}
/*
* Change mode of a file given path name.
*/
int
sys_chmod(struct proc *p, void *v, register_t *retval)
{
struct sys_chmod_args /* {
syscallarg(const char *) path;
syscallarg(mode_t) mode;
} */ *uap = v;
return (dofchmodat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode), 0));
}
int
sys_fchmodat(struct proc *p, void *v, register_t *retval)
{
struct sys_fchmodat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(mode_t) mode;
syscallarg(int) flag;
} */ *uap = v;
return (dofchmodat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, mode), SCARG(uap, flag)));
}
int
dofchmodat(struct proc *p, int fd, const char *path, mode_t mode, int flag)
{
struct vnode *vp;
struct vattr vattr;
int error, follow;
struct nameidata nd;
if (mode & ~(S_IFMT | ALLPERMS))
return (EINVAL);
if ((p->p_p->ps_flags & PS_PLEDGE))
mode &= ACCESSPERMS;
if (flag & ~AT_SYMLINK_NOFOLLOW)
return (EINVAL);
follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
NDINITAT(&nd, LOOKUP, follow, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_FATTR | PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_WRITE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
vput(vp);
return (error);
}
/*
* Change mode of a file given a file descriptor.
*/
int
sys_fchmod(struct proc *p, void *v, register_t *retval)
{
struct sys_fchmod_args /* {
syscallarg(int) fd;
syscallarg(mode_t) mode;
} */ *uap = v;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
mode_t mode = SCARG(uap, mode);
int error;
if (mode & ~(S_IFMT | ALLPERMS))
return (EINVAL);
if ((p->p_p->ps_flags & PS_PLEDGE))
mode &= ACCESSPERMS;
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount && vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
VOP_UNLOCK(vp);
FRELE(fp, p);
return (error);
}
/*
* Set ownership given a path name.
*/
int
sys_chown(struct proc *p, void *v, register_t *retval)
{
struct sys_chown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
return (dofchownat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, uid),
SCARG(uap, gid), 0));
}
int
sys_fchownat(struct proc *p, void *v, register_t *retval)
{
struct sys_fchownat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
syscallarg(int) flag;
} */ *uap = v;
return (dofchownat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, uid), SCARG(uap, gid), SCARG(uap, flag)));
}
int
dofchownat(struct proc *p, int fd, const char *path, uid_t uid, gid_t gid,
int flag)
{
struct vnode *vp;
struct vattr vattr;
int error, follow;
struct nameidata nd;
mode_t mode;
if (flag & ~AT_SYMLINK_NOFOLLOW)
return (EINVAL);
follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
NDINITAT(&nd, LOOKUP, follow, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_CHOWN | PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_WRITE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
if ((error = pledge_chown(p, uid, gid)))
goto out;
if ((uid != -1 || gid != -1) &&
!vnoperm(vp) &&
(suser(p) || suid_clear)) {
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
goto out;
mode = vattr.va_mode & ~(VSUID | VSGID);
if (mode == vattr.va_mode)
mode = VNOVAL;
} else
mode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
vattr.va_mode = mode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
vput(vp);
return (error);
}
/*
* Set ownership given a path name, without following links.
*/
int
sys_lchown(struct proc *p, void *v, register_t *retval)
{
struct sys_lchown_args /* {
syscallarg(const char *) path;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
mode_t mode;
uid_t uid = SCARG(uap, uid);
gid_t gid = SCARG(uap, gid);
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
nd.ni_pledge = PLEDGE_CHOWN | PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_WRITE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else {
if ((error = pledge_chown(p, uid, gid)))
goto out;
if ((uid != -1 || gid != -1) &&
!vnoperm(vp) &&
(suser(p) || suid_clear)) {
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
goto out;
mode = vattr.va_mode & ~(VSUID | VSGID);
if (mode == vattr.va_mode)
mode = VNOVAL;
} else
mode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
vattr.va_mode = mode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
vput(vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
int
sys_fchown(struct proc *p, void *v, register_t *retval)
{
struct sys_fchown_args /* {
syscallarg(int) fd;
syscallarg(uid_t) uid;
syscallarg(gid_t) gid;
} */ *uap = v;
struct vnode *vp;
struct vattr vattr;
int error;
struct file *fp;
mode_t mode;
uid_t uid = SCARG(uap, uid);
gid_t gid = SCARG(uap, gid);
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_RDONLY))
error = EROFS;
else {
if ((error = pledge_chown(p, uid, gid)))
goto out;
if ((uid != -1 || gid != -1) &&
!vnoperm(vp) &&
(suser(p) || suid_clear)) {
error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
if (error)
goto out;
mode = vattr.va_mode & ~(VSUID | VSGID);
if (mode == vattr.va_mode)
mode = VNOVAL;
} else
mode = VNOVAL;
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
vattr.va_mode = mode;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
out:
VOP_UNLOCK(vp);
FRELE(fp, p);
return (error);
}
/*
* Set the access and modification times given a path name.
*/
int
sys_utimes(struct proc *p, void *v, register_t *retval)
{
struct sys_utimes_args /* {
syscallarg(const char *) path;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
struct timespec ts[2];
struct timeval tv[2];
const struct timeval *tvp;
int error;
tvp = SCARG(uap, tptr);
if (tvp != NULL) {
error = copyin(tvp, tv, sizeof(tv));
if (error)
return (error);
#ifdef KTRACE
if (KTRPOINT(p, KTR_STRUCT))
ktrabstimeval(p, &tv);
#endif
if (!timerisvalid(&tv[0]) || !timerisvalid(&tv[1]))
return (EINVAL);
TIMEVAL_TO_TIMESPEC(&tv[0], &ts[0]);
TIMEVAL_TO_TIMESPEC(&tv[1], &ts[1]);
} else
ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW;
return (doutimensat(p, AT_FDCWD, SCARG(uap, path), ts, 0));
}
int
sys_utimensat(struct proc *p, void *v, register_t *retval)
{
struct sys_utimensat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(const struct timespec *) times;
syscallarg(int) flag;
} */ *uap = v;
struct timespec ts[2];
const struct timespec *tsp;
int error, i;
tsp = SCARG(uap, times);
if (tsp != NULL) {
error = copyin(tsp, ts, sizeof(ts));
if (error)
return (error);
for (i = 0; i < nitems(ts); i++) {
if (ts[i].tv_nsec == UTIME_NOW)
continue;
if (ts[i].tv_nsec == UTIME_OMIT)
continue;
#ifdef KTRACE
if (KTRPOINT(p, KTR_STRUCT))
ktrabstimespec(p, &ts[i]);
#endif
if (!timespecisvalid(&ts[i]))
return (EINVAL);
}
} else
ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW;
return (doutimensat(p, SCARG(uap, fd), SCARG(uap, path), ts,
SCARG(uap, flag)));
}
int
doutimensat(struct proc *p, int fd, const char *path,
struct timespec ts[2], int flag)
{
struct vnode *vp;
int error, follow;
struct nameidata nd;
if (flag & ~AT_SYMLINK_NOFOLLOW)
return (EINVAL);
follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
NDINITAT(&nd, LOOKUP, follow, UIO_USERSPACE, fd, path, p);
nd.ni_pledge = PLEDGE_FATTR | PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_WRITE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
return (dovutimens(p, vp, ts));
}
int
dovutimens(struct proc *p, struct vnode *vp, struct timespec ts[2])
{
struct vattr vattr;
struct timespec now;
int error;
#ifdef KTRACE
/* if they're both UTIME_NOW, then don't report either */
if ((ts[0].tv_nsec != UTIME_NOW || ts[1].tv_nsec != UTIME_NOW) &&
KTRPOINT(p, KTR_STRUCT)) {
ktrabstimespec(p, &ts[0]);
ktrabstimespec(p, &ts[1]);
}
#endif
VATTR_NULL(&vattr);
/* make sure ctime is updated even if neither mtime nor atime is */
vattr.va_vaflags = VA_UTIMES_CHANGE;
if (ts[0].tv_nsec == UTIME_NOW || ts[1].tv_nsec == UTIME_NOW) {
if (ts[0].tv_nsec == UTIME_NOW && ts[1].tv_nsec == UTIME_NOW)
vattr.va_vaflags |= VA_UTIMES_NULL;
getnanotime(&now);
if (ts[0].tv_nsec == UTIME_NOW)
ts[0] = now;
if (ts[1].tv_nsec == UTIME_NOW)
ts[1] = now;
}
if (ts[0].tv_nsec != UTIME_OMIT)
vattr.va_atime = ts[0];
if (ts[1].tv_nsec != UTIME_OMIT)
vattr.va_mtime = ts[1];
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
vput(vp);
return (error);
}
/*
* Set the access and modification times given a file descriptor.
*/
int
sys_futimes(struct proc *p, void *v, register_t *retval)
{
struct sys_futimes_args /* {
syscallarg(int) fd;
syscallarg(const struct timeval *) tptr;
} */ *uap = v;
struct timeval tv[2];
struct timespec ts[2];
const struct timeval *tvp;
int error;
tvp = SCARG(uap, tptr);
if (tvp != NULL) {
error = copyin(tvp, tv, sizeof(tv));
if (error)
return (error);
#ifdef KTRACE
if (KTRPOINT(p, KTR_STRUCT)) {
ktrabstimeval(p, &tv[0]);
ktrabstimeval(p, &tv[1]);
}
#endif
if (!timerisvalid(&tv[0]) || !timerisvalid(&tv[1]))
return (EINVAL);
TIMEVAL_TO_TIMESPEC(&tv[0], &ts[0]);
TIMEVAL_TO_TIMESPEC(&tv[1], &ts[1]);
} else
ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW;
return (dofutimens(p, SCARG(uap, fd), ts));
}
int
sys_futimens(struct proc *p, void *v, register_t *retval)
{
struct sys_futimens_args /* {
syscallarg(int) fd;
syscallarg(const struct timespec *) times;
} */ *uap = v;
struct timespec ts[2];
const struct timespec *tsp;
int error, i;
tsp = SCARG(uap, times);
if (tsp != NULL) {
error = copyin(tsp, ts, sizeof(ts));
if (error)
return (error);
for (i = 0; i < nitems(ts); i++) {
if (ts[i].tv_nsec == UTIME_NOW)
continue;
if (ts[i].tv_nsec == UTIME_OMIT)
continue;
#ifdef KTRACE
if (KTRPOINT(p, KTR_STRUCT))
ktrabstimespec(p, &ts[i]);
#endif
if (!timespecisvalid(&ts[i]))
return (EINVAL);
}
} else
ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW;
return (dofutimens(p, SCARG(uap, fd), ts));
}
int
dofutimens(struct proc *p, int fd, struct timespec ts[2])
{
struct file *fp;
struct vnode *vp;
int error;
if ((error = getvnode(p, fd, &fp)) != 0)
return (error);
vp = fp->f_data;
vref(vp);
FRELE(fp, p);
return (dovutimens(p, vp, ts));
}
/*
* Truncate a file given a vnode.
*/
int
dotruncate(struct proc *p, struct vnode *vp, off_t len)
{
struct vattr vattr;
int error;
if (len < 0)
return EINVAL;
if (vp->v_type == VDIR)
return EISDIR;
if ((error = vn_writechk(vp)) != 0)
return error;
if (vp->v_type == VREG && len > lim_cur_proc(p, RLIMIT_FSIZE)) {
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
return error;
if (len > vattr.va_size) {
/* if extending over the limit, send signal and fail */
psignal(p, SIGXFSZ);
return EFBIG;
}
}
VATTR_NULL(&vattr);
vattr.va_size = len;
return VOP_SETATTR(vp, &vattr, p->p_ucred, p);
}
/*
* Truncate a file given its path name.
*/
int
sys_truncate(struct proc *p, void *v, register_t *retval)
{
struct sys_truncate_args /* {
syscallarg(const char *) path;
syscallarg(off_t) length;
} */ *uap = v;
struct vnode *vp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
nd.ni_pledge = PLEDGE_FATTR | PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_WRITE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0)
error = dotruncate(p, vp, SCARG(uap, length));
vput(vp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
int
sys_ftruncate(struct proc *p, void *v, register_t *retval)
{
struct sys_ftruncate_args /* {
syscallarg(int) fd;
syscallarg(off_t) length;
} */ *uap = v;
struct vnode *vp;
struct file *fp;
int error;
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
error = EINVAL;
goto bad;
}
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = dotruncate(p, vp, SCARG(uap, length));
VOP_UNLOCK(vp);
bad:
FRELE(fp, p);
return (error);
}
/*
* Sync an open file.
*/
int
sys_fsync(struct proc *p, void *v, register_t *retval)
{
struct sys_fsync_args /* {
syscallarg(int) fd;
} */ *uap = v;
struct vnode *vp;
struct file *fp;
int error;
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p);
VOP_UNLOCK(vp);
FRELE(fp, p);
return (error);
}
/*
* Rename files. Source and destination must either both be directories,
* or both not be directories. If target is a directory, it must be empty.
*/
int
sys_rename(struct proc *p, void *v, register_t *retval)
{
struct sys_rename_args /* {
syscallarg(const char *) from;
syscallarg(const char *) to;
} */ *uap = v;
return (dorenameat(p, AT_FDCWD, SCARG(uap, from), AT_FDCWD,
SCARG(uap, to)));
}
int
sys_renameat(struct proc *p, void *v, register_t *retval)
{
struct sys_renameat_args /* {
syscallarg(int) fromfd;
syscallarg(const char *) from;
syscallarg(int) tofd;
syscallarg(const char *) to;
} */ *uap = v;
return (dorenameat(p, SCARG(uap, fromfd), SCARG(uap, from),
SCARG(uap, tofd), SCARG(uap, to)));
}
int
dorenameat(struct proc *p, int fromfd, const char *from, int tofd,
const char *to)
{
struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
int flags;
NDINITAT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
fromfd, from, p);
fromnd.ni_pledge = PLEDGE_RPATH | PLEDGE_CPATH;
fromnd.ni_unveil = UNVEIL_READ | UNVEIL_CREATE;
if ((error = namei(&fromnd)) != 0)
return (error);
fvp = fromnd.ni_vp;
flags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART;
/*
* rename("foo/", "bar/"); is OK
*/
if (fvp->v_type == VDIR)
flags |= STRIPSLASHES;
NDINITAT(&tond, RENAME, flags, UIO_USERSPACE, tofd, to, p);
tond.ni_pledge = PLEDGE_CPATH;
tond.ni_unveil = UNVEIL_CREATE;
if ((error = namei(&tond)) != 0) {
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
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;
}
}
if (fvp == tdvp)
error = EINVAL;
/*
* If source is the same as the destination (that is the
* same inode number)
*/
if (fvp == tvp)
error = -1;
out:
if (!error) {
if (tvp) {
(void)uvm_vnp_uncache(tvp);
}
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
} else {
VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
pool_put(&namei_pool, tond.ni_cnd.cn_pnbuf);
out1:
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
pool_put(&namei_pool, fromnd.ni_cnd.cn_pnbuf);
if (error == -1)
return (0);
return (error);
}
/*
* Make a directory file.
*/
int
sys_mkdir(struct proc *p, void *v, register_t *retval)
{
struct sys_mkdir_args /* {
syscallarg(const char *) path;
syscallarg(mode_t) mode;
} */ *uap = v;
return (domkdirat(p, AT_FDCWD, SCARG(uap, path), SCARG(uap, mode)));
}
int
sys_mkdirat(struct proc *p, void *v, register_t *retval)
{
struct sys_mkdirat_args /* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(mode_t) mode;
} */ *uap = v;
return (domkdirat(p, SCARG(uap, fd), SCARG(uap, path),
SCARG(uap, mode)));
}
int
domkdirat(struct proc *p, int fd, const char *path, mode_t mode)
{
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINITAT(&nd, CREATE, LOCKPARENT | STRIPSLASHES, UIO_USERSPACE,
fd, path, p);
nd.ni_pledge = PLEDGE_CPATH;
nd.ni_unveil = UNVEIL_CREATE;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask;
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (!error)
vput(nd.ni_vp);
return (error);
}
/*
* Remove a directory file.
*/
int
sys_rmdir(struct proc *p, void *v, register_t *retval)
{
struct sys_rmdir_args /* {
syscallarg(const char *) path;
} */ *uap = v;
return (dounlinkat(p, AT_FDCWD, SCARG(uap, path), AT_REMOVEDIR));
}
/*
* Read a block of directory entries in a file system independent format.
*/
int
sys_getdents(struct proc *p, void *v, register_t *retval)
{
struct sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(void *) buf;
syscallarg(size_t) buflen;
} */ *uap = v;
struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
size_t buflen;
int error, eofflag;
buflen = SCARG(uap, buflen);
if (buflen > INT_MAX)
return (EINVAL);
if ((error = getvnode(p, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto bad;
}
vp = fp->f_data;
if (vp->v_type != VDIR) {
error = EINVAL;
goto bad;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (fp->f_offset < 0) {
VOP_UNLOCK(vp);
error = EINVAL;
goto bad;
}
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;
auio.uio_resid = buflen;
auio.uio_offset = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag);
mtx_enter(&fp->f_mtx);
fp->f_offset = auio.uio_offset;
mtx_leave(&fp->f_mtx);
VOP_UNLOCK(vp);
if (error)
goto bad;
*retval = buflen - auio.uio_resid;
bad:
FRELE(fp, p);
return (error);
}
/*
* Set the mode mask for creation of filesystem nodes.
*/
int
sys_umask(struct proc *p, void *v, register_t *retval)
{
struct sys_umask_args /* {
syscallarg(mode_t) newmask;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
fdplock(fdp);
*retval = fdp->fd_cmask;
fdp->fd_cmask = SCARG(uap, newmask) & ACCESSPERMS;
fdpunlock(fdp);
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
int
sys_revoke(struct proc *p, void *v, register_t *retval)
{
struct sys_revoke_args /* {
syscallarg(const char *) path;
} */ *uap = v;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
nd.ni_pledge = PLEDGE_RPATH | PLEDGE_TTY;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VCHR || (u_int)major(vp->v_rdev) >= nchrdev ||
cdevsw[major(vp->v_rdev)].d_type != D_TTY) {
error = ENOTTY;
goto out;
}
if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
goto out;
if (p->p_ucred->cr_uid != vattr.va_uid &&
(error = suser(p)))
goto out;
if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED)))
VOP_REVOKE(vp, REVOKEALL);
out:
vrele(vp);
return (error);
}
/*
* Convert a user file descriptor to a kernel file entry.
*
* On return *fpp is FREF:ed.
*/
int
getvnode(struct proc *p, int fd, struct file **fpp)
{
struct file *fp;
struct vnode *vp;
if ((fp = fd_getfile(p->p_fd, fd)) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_VNODE) {
FRELE(fp, p);
return (EINVAL);
}
vp = fp->f_data;
if (vp->v_type == VBAD) {
FRELE(fp, p);
return (EBADF);
}
*fpp = fp;
return (0);
}
/*
* Positional read system call.
*/
int
sys_pread(struct proc *p, void *v, register_t *retval)
{
struct sys_pread_args /* {
syscallarg(int) fd;
syscallarg(void *) buf;
syscallarg(size_t) nbyte;
syscallarg(off_t) offset;
} */ *uap = v;
struct iovec iov;
struct uio auio;
iov.iov_base = SCARG(uap, buf);
iov.iov_len = SCARG(uap, nbyte);
if (iov.iov_len > SSIZE_MAX)
return (EINVAL);
auio.uio_iov = &iov;
auio.uio_iovcnt = 1;
auio.uio_resid = iov.iov_len;
auio.uio_offset = SCARG(uap, offset);
return (dofilereadv(p, SCARG(uap, fd), &auio, FO_POSITION, retval));
}
/*
* Positional scatter read system call.
*/
int
sys_preadv(struct proc *p, void *v, register_t *retval)
{
struct sys_preadv_args /* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(off_t) offset;
} */ *uap = v;
struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
int error, iovcnt = SCARG(uap, iovcnt);
struct uio auio;
size_t resid;
error = iovec_copyin(SCARG(uap, iovp), &iov, aiov, iovcnt, &resid);
if (error)
goto done;
auio.uio_iov = iov;
auio.uio_iovcnt = iovcnt;
auio.uio_resid = resid;
auio.uio_offset = SCARG(uap, offset);
error = dofilereadv(p, SCARG(uap, fd), &auio, FO_POSITION, retval);
done:
iovec_free(iov, iovcnt);
return (error);
}
/*
* Positional write system call.
*/
int
sys_pwrite(struct proc *p, void *v, register_t *retval)
{
struct sys_pwrite_args /* {
syscallarg(int) fd;
syscallarg(const void *) buf;
syscallarg(size_t) nbyte;
syscallarg(off_t) offset;
} */ *uap = v;
struct iovec iov;
struct uio auio;
iov.iov_base = (void *)SCARG(uap, buf);
iov.iov_len = SCARG(uap, nbyte);
if (iov.iov_len > SSIZE_MAX)
return (EINVAL);
auio.uio_iov = &iov;
auio.uio_iovcnt = 1;
auio.uio_resid = iov.iov_len;
auio.uio_offset = SCARG(uap, offset);
return (dofilewritev(p, SCARG(uap, fd), &auio, FO_POSITION, retval));
}
/*
* Positional gather write system call.
*/
int
sys_pwritev(struct proc *p, void *v, register_t *retval)
{
struct sys_pwritev_args /* {
syscallarg(int) fd;
syscallarg(const struct iovec *) iovp;
syscallarg(int) iovcnt;
syscallarg(off_t) offset;
} */ *uap = v;
struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
int error, iovcnt = SCARG(uap, iovcnt);
struct uio auio;
size_t resid;
error = iovec_copyin(SCARG(uap, iovp), &iov, aiov, iovcnt, &resid);
if (error)
goto done;
auio.uio_iov = iov;
auio.uio_iovcnt = iovcnt;
auio.uio_resid = resid;
auio.uio_offset = SCARG(uap, offset);
error = dofilewritev(p, SCARG(uap, fd), &auio, FO_POSITION, retval);
done:
iovec_free(iov, iovcnt);
return (error);
}
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