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/*-
* Copyright (c) 1998 Mark Newton
* Copyright (c) 1994, 1997 Christos Zoulas.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christos Zoulas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/compat/svr4/svr4_fcntl.c 225617 2011-09-16 13:58:51Z kmacy $");
#include <sys/param.h>
#include <sys/capability.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/filedesc.h>
/*#include <sys/ioctl.h>*/
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/syscallsubr.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/sysproto.h>
#include <compat/svr4/svr4.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_proto.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_fcntl.h>
#include <security/mac/mac_framework.h>
static int svr4_to_bsd_flags(int);
static u_long svr4_to_bsd_cmd(u_long);
static int fd_revoke(struct thread *, int);
static int fd_truncate(struct thread *, int, struct flock *);
static int bsd_to_svr4_flags(int);
static void bsd_to_svr4_flock(struct flock *, struct svr4_flock *);
static void svr4_to_bsd_flock(struct svr4_flock *, struct flock *);
static void bsd_to_svr4_flock64(struct flock *, struct svr4_flock64 *);
static void svr4_to_bsd_flock64(struct svr4_flock64 *, struct flock *);
static u_long
svr4_to_bsd_cmd(cmd)
u_long cmd;
{
switch (cmd) {
case SVR4_F_DUPFD:
return F_DUPFD;
case SVR4_F_DUP2FD:
return F_DUP2FD;
case SVR4_F_GETFD:
return F_GETFD;
case SVR4_F_SETFD:
return F_SETFD;
case SVR4_F_GETFL:
return F_GETFL;
case SVR4_F_SETFL:
return F_SETFL;
case SVR4_F_GETLK:
return F_GETLK;
case SVR4_F_SETLK:
return F_SETLK;
case SVR4_F_SETLKW:
return F_SETLKW;
default:
return -1;
}
}
static int
svr4_to_bsd_flags(l)
int l;
{
int r = 0;
r |= (l & SVR4_O_RDONLY) ? O_RDONLY : 0;
r |= (l & SVR4_O_WRONLY) ? O_WRONLY : 0;
r |= (l & SVR4_O_RDWR) ? O_RDWR : 0;
r |= (l & SVR4_O_NDELAY) ? O_NONBLOCK : 0;
r |= (l & SVR4_O_APPEND) ? O_APPEND : 0;
r |= (l & SVR4_O_SYNC) ? O_FSYNC : 0;
r |= (l & SVR4_O_NONBLOCK) ? O_NONBLOCK : 0;
r |= (l & SVR4_O_PRIV) ? O_EXLOCK : 0;
r |= (l & SVR4_O_CREAT) ? O_CREAT : 0;
r |= (l & SVR4_O_TRUNC) ? O_TRUNC : 0;
r |= (l & SVR4_O_EXCL) ? O_EXCL : 0;
r |= (l & SVR4_O_NOCTTY) ? O_NOCTTY : 0;
return r;
}
static int
bsd_to_svr4_flags(l)
int l;
{
int r = 0;
r |= (l & O_RDONLY) ? SVR4_O_RDONLY : 0;
r |= (l & O_WRONLY) ? SVR4_O_WRONLY : 0;
r |= (l & O_RDWR) ? SVR4_O_RDWR : 0;
r |= (l & O_NDELAY) ? SVR4_O_NONBLOCK : 0;
r |= (l & O_APPEND) ? SVR4_O_APPEND : 0;
r |= (l & O_FSYNC) ? SVR4_O_SYNC : 0;
r |= (l & O_NONBLOCK) ? SVR4_O_NONBLOCK : 0;
r |= (l & O_EXLOCK) ? SVR4_O_PRIV : 0;
r |= (l & O_CREAT) ? SVR4_O_CREAT : 0;
r |= (l & O_TRUNC) ? SVR4_O_TRUNC : 0;
r |= (l & O_EXCL) ? SVR4_O_EXCL : 0;
r |= (l & O_NOCTTY) ? SVR4_O_NOCTTY : 0;
return r;
}
static void
bsd_to_svr4_flock(iflp, oflp)
struct flock *iflp;
struct svr4_flock *oflp;
{
switch (iflp->l_type) {
case F_RDLCK:
oflp->l_type = SVR4_F_RDLCK;
break;
case F_WRLCK:
oflp->l_type = SVR4_F_WRLCK;
break;
case F_UNLCK:
oflp->l_type = SVR4_F_UNLCK;
break;
default:
oflp->l_type = -1;
break;
}
oflp->l_whence = (short) iflp->l_whence;
oflp->l_start = (svr4_off_t) iflp->l_start;
oflp->l_len = (svr4_off_t) iflp->l_len;
oflp->l_sysid = 0;
oflp->l_pid = (svr4_pid_t) iflp->l_pid;
}
static void
svr4_to_bsd_flock(iflp, oflp)
struct svr4_flock *iflp;
struct flock *oflp;
{
switch (iflp->l_type) {
case SVR4_F_RDLCK:
oflp->l_type = F_RDLCK;
break;
case SVR4_F_WRLCK:
oflp->l_type = F_WRLCK;
break;
case SVR4_F_UNLCK:
oflp->l_type = F_UNLCK;
break;
default:
oflp->l_type = -1;
break;
}
oflp->l_whence = iflp->l_whence;
oflp->l_start = (off_t) iflp->l_start;
oflp->l_len = (off_t) iflp->l_len;
oflp->l_pid = (pid_t) iflp->l_pid;
oflp->l_sysid = iflp->l_sysid;
}
static void
bsd_to_svr4_flock64(iflp, oflp)
struct flock *iflp;
struct svr4_flock64 *oflp;
{
switch (iflp->l_type) {
case F_RDLCK:
oflp->l_type = SVR4_F_RDLCK;
break;
case F_WRLCK:
oflp->l_type = SVR4_F_WRLCK;
break;
case F_UNLCK:
oflp->l_type = SVR4_F_UNLCK;
break;
default:
oflp->l_type = -1;
break;
}
oflp->l_whence = (short) iflp->l_whence;
oflp->l_start = (svr4_off64_t) iflp->l_start;
oflp->l_len = (svr4_off64_t) iflp->l_len;
oflp->l_sysid = iflp->l_sysid;
oflp->l_pid = (svr4_pid_t) iflp->l_pid;
}
static void
svr4_to_bsd_flock64(iflp, oflp)
struct svr4_flock64 *iflp;
struct flock *oflp;
{
switch (iflp->l_type) {
case SVR4_F_RDLCK:
oflp->l_type = F_RDLCK;
break;
case SVR4_F_WRLCK:
oflp->l_type = F_WRLCK;
break;
case SVR4_F_UNLCK:
oflp->l_type = F_UNLCK;
break;
default:
oflp->l_type = -1;
break;
}
oflp->l_whence = iflp->l_whence;
oflp->l_start = (off_t) iflp->l_start;
oflp->l_len = (off_t) iflp->l_len;
oflp->l_pid = (pid_t) iflp->l_pid;
}
static int
fd_revoke(td, fd)
struct thread *td;
int fd;
{
struct vnode *vp;
struct mount *mp;
struct vattr vattr;
int error, *retval;
retval = td->td_retval;
/*
* If we ever want to support Capsicum on SVR4 processes (unlikely)
* or FreeBSD grows a native frevoke() (more likely), we will need a
* CAP_REVOKE here.
*
* In the meantime, use CAP_MASK_VALID: if a SVR4 process wants to
* do an frevoke(), it needs to do it on either a regular file
* descriptor or a fully-privileged capability (which is effectively
* the same as a non-capability-restricted file descriptor).
*/
if ((error = fgetvp(td, fd, CAP_MASK_VALID, &vp)) != 0)
return (error);
if (vp->v_type != VCHR && vp->v_type != VBLK) {
error = EINVAL;
goto out;
}
#ifdef MAC
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = mac_vnode_check_revoke(td->td_ucred, vp);
VOP_UNLOCK(vp, 0);
if (error)
goto out;
#endif
if ((error = VOP_GETATTR(vp, &vattr, td->td_ucred)) != 0)
goto out;
if (td->td_ucred->cr_uid != vattr.va_uid &&
(error = priv_check(td, PRIV_VFS_ADMIN)) != 0)
goto out;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
goto out;
if (vcount(vp) > 1)
VOP_REVOKE(vp, REVOKEALL);
vn_finished_write(mp);
out:
vrele(vp);
return error;
}
static int
fd_truncate(td, fd, flp)
struct thread *td;
int fd;
struct flock *flp;
{
off_t start, length;
struct file *fp;
struct vnode *vp;
struct vattr vattr;
int error, *retval;
struct ftruncate_args ft;
retval = td->td_retval;
/*
* We only support truncating the file.
*/
if ((error = fget(td, fd, CAP_FTRUNCATE, &fp)) != 0)
return (error);
vp = fp->f_vnode;
if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
fdrop(fp, td);
return ESPIPE;
}
if ((error = VOP_GETATTR(vp, &vattr, td->td_ucred)) != 0) {
fdrop(fp, td);
return error;
}
length = vattr.va_size;
switch (flp->l_whence) {
case SEEK_CUR:
start = fp->f_offset + flp->l_start;
break;
case SEEK_END:
start = flp->l_start + length;
break;
case SEEK_SET:
start = flp->l_start;
break;
default:
fdrop(fp, td);
return EINVAL;
}
if (start + flp->l_len < length) {
/* We don't support free'ing in the middle of the file */
fdrop(fp, td);
return EINVAL;
}
ft.fd = fd;
ft.length = start;
error = sys_ftruncate(td, &ft);
fdrop(fp, td);
return (error);
}
int
svr4_sys_open(td, uap)
struct thread *td;
struct svr4_sys_open_args *uap;
{
struct proc *p = td->td_proc;
char *newpath;
int bsd_flags, error, retval;
CHECKALTEXIST(td, uap->path, &newpath);
bsd_flags = svr4_to_bsd_flags(uap->flags);
error = kern_open(td, newpath, UIO_SYSSPACE, bsd_flags, uap->mode);
free(newpath, M_TEMP);
if (error) {
/* uprintf("svr4_open(%s, 0x%0x, 0%o): %d\n", uap->path,
uap->flags, uap->mode, error);*/
return error;
}
retval = td->td_retval[0];
PROC_LOCK(p);
if (!(bsd_flags & O_NOCTTY) && SESS_LEADER(p) &&
!(p->p_flag & P_CONTROLT)) {
#if defined(NOTYET)
struct file *fp;
error = fget(td, retval, CAP_IOCTL, &fp);
PROC_UNLOCK(p);
/*
* we may have lost a race the above open() and
* another thread issuing a close()
*/
if (error)
return (EBADF); /* XXX: correct errno? */
/* ignore any error, just give it a try */
if (fp->f_type == DTYPE_VNODE)
fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, td->td_ucred,
td);
fdrop(fp, td);
} else {
PROC_UNLOCK(p);
}
#else
}
PROC_UNLOCK(p);
#endif
return error;
}
int
svr4_sys_open64(td, uap)
struct thread *td;
struct svr4_sys_open64_args *uap;
{
return svr4_sys_open(td, (struct svr4_sys_open_args *)uap);
}
int
svr4_sys_creat(td, uap)
struct thread *td;
struct svr4_sys_creat_args *uap;
{
char *newpath;
int error;
CHECKALTEXIST(td, uap->path, &newpath);
error = kern_open(td, newpath, UIO_SYSSPACE, O_WRONLY | O_CREAT |
O_TRUNC, uap->mode);
free(newpath, M_TEMP);
return (error);
}
int
svr4_sys_creat64(td, uap)
struct thread *td;
struct svr4_sys_creat64_args *uap;
{
return svr4_sys_creat(td, (struct svr4_sys_creat_args *)uap);
}
int
svr4_sys_llseek(td, uap)
struct thread *td;
struct svr4_sys_llseek_args *uap;
{
struct lseek_args ap;
ap.fd = uap->fd;
#if BYTE_ORDER == BIG_ENDIAN
ap.offset = (((u_int64_t) uap->offset1) << 32) |
uap->offset2;
#else
ap.offset = (((u_int64_t) uap->offset2) << 32) |
uap->offset1;
#endif
ap.whence = uap->whence;
return sys_lseek(td, &ap);
}
int
svr4_sys_access(td, uap)
struct thread *td;
struct svr4_sys_access_args *uap;
{
char *newpath;
int error;
CHECKALTEXIST(td, uap->path, &newpath);
error = kern_access(td, newpath, UIO_SYSSPACE, uap->flags);
free(newpath, M_TEMP);
return (error);
}
#if defined(NOTYET)
int
svr4_sys_pread(td, uap)
struct thread *td;
struct svr4_sys_pread_args *uap;
{
struct pread_args pra;
/*
* Just translate the args structure and call the NetBSD
* pread(2) system call (offset type is 64-bit in NetBSD).
*/
pra.fd = uap->fd;
pra.buf = uap->buf;
pra.nbyte = uap->nbyte;
pra.offset = uap->off;
return pread(td, &pra);
}
#endif
#if defined(NOTYET)
int
svr4_sys_pread64(td, v, retval)
struct thread *td;
void *v;
register_t *retval;
{
struct svr4_sys_pread64_args *uap = v;
struct sys_pread_args pra;
/*
* Just translate the args structure and call the NetBSD
* pread(2) system call (offset type is 64-bit in NetBSD).
*/
pra.fd = uap->fd;
pra.buf = uap->buf;
pra.nbyte = uap->nbyte;
pra.offset = uap->off;
return (sys_pread(td, &pra, retval));
}
#endif /* NOTYET */
#if defined(NOTYET)
int
svr4_sys_pwrite(td, uap)
struct thread *td;
struct svr4_sys_pwrite_args *uap;
{
struct pwrite_args pwa;
/*
* Just translate the args structure and call the NetBSD
* pwrite(2) system call (offset type is 64-bit in NetBSD).
*/
pwa.fd = uap->fd;
pwa.buf = uap->buf;
pwa.nbyte = uap->nbyte;
pwa.offset = uap->off;
return pwrite(td, &pwa);
}
#endif
#if defined(NOTYET)
int
svr4_sys_pwrite64(td, v, retval)
struct thread *td;
void *v;
register_t *retval;
{
struct svr4_sys_pwrite64_args *uap = v;
struct sys_pwrite_args pwa;
/*
* Just translate the args structure and call the NetBSD
* pwrite(2) system call (offset type is 64-bit in NetBSD).
*/
pwa.fd = uap->fd;
pwa.buf = uap->buf;
pwa.nbyte = uap->nbyte;
pwa.offset = uap->off;
return (sys_pwrite(td, &pwa, retval));
}
#endif /* NOTYET */
int
svr4_sys_fcntl(td, uap)
struct thread *td;
struct svr4_sys_fcntl_args *uap;
{
int cmd, error, *retval;
retval = td->td_retval;
cmd = svr4_to_bsd_cmd(uap->cmd);
switch (cmd) {
case F_DUPFD:
case F_DUP2FD:
case F_GETFD:
case F_SETFD:
return (kern_fcntl(td, uap->fd, cmd, (intptr_t)uap->arg));
case F_GETFL:
error = kern_fcntl(td, uap->fd, cmd, (intptr_t)uap->arg);
if (error)
return (error);
*retval = bsd_to_svr4_flags(*retval);
return (error);
case F_SETFL:
{
/*
* we must save the O_ASYNC flag, as that is
* handled by ioctl(_, I_SETSIG, _) emulation.
*/
int flags;
DPRINTF(("Setting flags %p\n", uap->arg));
error = kern_fcntl(td, uap->fd, F_GETFL, 0);
if (error)
return (error);
flags = *retval;
flags &= O_ASYNC;
flags |= svr4_to_bsd_flags((u_long) uap->arg);
return (kern_fcntl(td, uap->fd, F_SETFL, flags));
}
case F_GETLK:
case F_SETLK:
case F_SETLKW:
{
struct svr4_flock ifl;
struct flock fl;
error = copyin(uap->arg, &ifl, sizeof (ifl));
if (error)
return (error);
svr4_to_bsd_flock(&ifl, &fl);
error = kern_fcntl(td, uap->fd, cmd, (intptr_t)&fl);
if (error || cmd != F_GETLK)
return (error);
bsd_to_svr4_flock(&fl, &ifl);
return (copyout(&ifl, uap->arg, sizeof (ifl)));
}
case -1:
switch (uap->cmd) {
case SVR4_F_FREESP:
{
struct svr4_flock ifl;
struct flock fl;
error = copyin(uap->arg, &ifl,
sizeof ifl);
if (error)
return error;
svr4_to_bsd_flock(&ifl, &fl);
return fd_truncate(td, uap->fd, &fl);
}
case SVR4_F_GETLK64:
case SVR4_F_SETLK64:
case SVR4_F_SETLKW64:
{
struct svr4_flock64 ifl;
struct flock fl;
switch (uap->cmd) {
case SVR4_F_GETLK64:
cmd = F_GETLK;
break;
case SVR4_F_SETLK64:
cmd = F_SETLK;
break;
case SVR4_F_SETLKW64:
cmd = F_SETLKW;
break;
}
error = copyin(uap->arg, &ifl,
sizeof (ifl));
if (error)
return (error);
svr4_to_bsd_flock64(&ifl, &fl);
error = kern_fcntl(td, uap->fd, cmd,
(intptr_t)&fl);
if (error || cmd != F_GETLK)
return (error);
bsd_to_svr4_flock64(&fl, &ifl);
return (copyout(&ifl, uap->arg,
sizeof (ifl)));
}
case SVR4_F_FREESP64:
{
struct svr4_flock64 ifl;
struct flock fl;
error = copyin(uap->arg, &ifl,
sizeof ifl);
if (error)
return error;
svr4_to_bsd_flock64(&ifl, &fl);
return fd_truncate(td, uap->fd, &fl);
}
case SVR4_F_REVOKE:
return fd_revoke(td, uap->fd);
default:
return ENOSYS;
}
default:
return ENOSYS;
}
}