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Merge branch 'work.misc-set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull misc user access cleanups from Al Viro:
 "The first pile is assorted getting rid of cargo-culted access_ok(),
  cargo-culted set_fs() and field-by-field copyouts.

  The same description applies to a lot of stuff in other branches -
  this is just the stuff that didn't fit into a more specific topical
  branch"

* 'work.misc-set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  Switch flock copyin/copyout primitives to copy_{from,to}_user()
  fs/fcntl: return -ESRCH in f_setown when pid/pgid can't be found
  fs/fcntl: f_setown, avoid undefined behaviour
  fs/fcntl: f_setown, allow returning error
  lpfc debugfs: get rid of pointless access_ok()
  adb: get rid of pointless access_ok()
  isdn: get rid of pointless access_ok()
  compat statfs: switch to copy_to_user()
  fs/locks: don't mess with the address limit in compat_fcntl64
  nfsd_readlink(): switch to vfs_get_link()
  drbd: ->sendpage() never needed set_fs()
  fs/locks: pass kernel struct flock to fcntl_getlk/setlk
  fs: locks: Fix some troubles at kernel-doc comments
This commit is contained in:
Linus Torvalds 2017-07-05 13:13:32 -07:00
commit 3bad2f1c67
12 changed files with 224 additions and 275 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/block/drbd/drbd_main.c
View File

@ -1551,7 +1551,6 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa
int offset, size_t size, unsigned msg_flags)
{
struct socket *socket = peer_device->connection->data.socket;
mm_segment_t oldfs = get_fs();
int len = size;
int err = -EIO;
@ -1566,7 +1565,6 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa
msg_flags |= MSG_NOSIGNAL;
drbd_update_congested(peer_device->connection);
set_fs(KERNEL_DS);
do {
int sent;
@ -1586,7 +1584,6 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa
len -= sent;
offset += sent;
} while (len > 0 /* THINK && device->cstate >= C_CONNECTED*/);
set_fs(oldfs);
clear_bit(NET_CONGESTED, &peer_device->connection->flags);
if (len == 0) {

18
drivers/isdn/i4l/isdn_common.c
View File

@ -1304,9 +1304,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
if (arg) {
ulong __user *p = argp;
int i;
if (!access_ok(VERIFY_WRITE, p,
sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
return -EFAULT;
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
put_user(dev->ibytes[i], p++);
put_user(dev->obytes[i], p++);
@ -1540,11 +1537,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
char __user *p = argp;
int i;
if (!access_ok(VERIFY_WRITE, argp,
(ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
* ISDN_MAX_CHANNELS))
return -EFAULT;
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
if (copy_to_user(p, dev->mdm.info[i].emu.profile,
ISDN_MODEM_NUMREG))
@ -1567,11 +1559,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
char __user *p = argp;
int i;
if (!access_ok(VERIFY_READ, argp,
(ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
* ISDN_MAX_CHANNELS))
return -EFAULT;
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
if (copy_from_user(dev->mdm.info[i].emu.profile, p,
ISDN_MODEM_NUMREG))
@ -1617,8 +1604,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
int j = 0;
while (1) {
if (!access_ok(VERIFY_READ, p, 1))
return -EFAULT;
get_user(bname[j], p++);
switch (bname[j]) {
case '\0':
@ -1685,9 +1670,6 @@ isdn_ioctl(struct file *file, uint cmd, ulong arg)
drvidx = 0;
if (drvidx == -1)
return -ENODEV;
if (!access_ok(VERIFY_WRITE, argp,
sizeof(isdn_ioctl_struct)))
return -EFAULT;
c.driver = drvidx;
c.command = ISDN_CMD_IOCTL;
c.arg = cmd;

6
drivers/isdn/i4l/isdn_ppp.c
View File

@ -795,9 +795,6 @@ isdn_ppp_read(int min, struct file *file, char __user *buf, int count)
if (!(is->state & IPPP_OPEN))
return 0;
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
spin_lock_irqsave(&is->buflock, flags);
b = is->first->next;
save_buf = b->buf;
@ -2014,9 +2011,6 @@ isdn_ppp_dev_ioctl_stats(int slot, struct ifreq *ifr, struct net_device *dev)
struct ppp_stats t;
isdn_net_local *lp = netdev_priv(dev);
if (!access_ok(VERIFY_WRITE, res, sizeof(struct ppp_stats)))
return -EFAULT;
/* build a temporary stat struct and copy it to user space */
memset(&t, 0, sizeof(struct ppp_stats));

2
drivers/isdn/isdnloop/isdnloop.c
View File

@ -1142,8 +1142,6 @@ isdnloop_command(isdn_ctrl *c, isdnloop_card *card)
case ISDNLOOP_IOCTL_DEBUGVAR:
return (ulong) card;
case ISDNLOOP_IOCTL_STARTUP:
if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
return -EFAULT;
return isdnloop_start(card, (isdnloop_sdef *) a);
break;
case ISDNLOOP_IOCTL_ADDCARD:

4
drivers/macintosh/adb.c
View File

@ -723,8 +723,6 @@ static ssize_t adb_read(struct file *file, char __user *buf,
return -EINVAL;
if (count > sizeof(req->reply))
count = sizeof(req->reply);
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
req = NULL;
spin_lock_irqsave(&state->lock, flags);
@ -781,8 +779,6 @@ static ssize_t adb_write(struct file *file, const char __user *buf,
return -EINVAL;
if (adb_controller == NULL)
return -ENXIO;
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
req = kmalloc(sizeof(struct adb_request),
GFP_KERNEL);

20
drivers/scsi/lpfc/lpfc_debugfs.c
View File

@ -1949,10 +1949,6 @@ lpfc_debugfs_nvmestat_write(struct file *file, const char __user *buf,
if (nbytes > 64)
nbytes = 64;
/* Protect copy from user */
if (!access_ok(VERIFY_READ, buf, nbytes))
return -EFAULT;
memset(mybuf, 0, sizeof(mybuf));
if (copy_from_user(mybuf, buf, nbytes))
@ -2037,10 +2033,6 @@ lpfc_debugfs_nvmektime_write(struct file *file, const char __user *buf,
if (nbytes > 64)
nbytes = 64;
/* Protect copy from user */
if (!access_ok(VERIFY_READ, buf, nbytes))
return -EFAULT;
memset(mybuf, 0, sizeof(mybuf));
if (copy_from_user(mybuf, buf, nbytes))
@ -2169,10 +2161,6 @@ lpfc_debugfs_nvmeio_trc_write(struct file *file, const char __user *buf,
if (nbytes > 64)
nbytes = 64;
/* Protect copy from user */
if (!access_ok(VERIFY_READ, buf, nbytes))
return -EFAULT;
memset(mybuf, 0, sizeof(mybuf));
if (copy_from_user(mybuf, buf, nbytes))
@ -2280,10 +2268,6 @@ lpfc_debugfs_cpucheck_write(struct file *file, const char __user *buf,
if (nbytes > 64)
nbytes = 64;
/* Protect copy from user */
if (!access_ok(VERIFY_READ, buf, nbytes))
return -EFAULT;
memset(mybuf, 0, sizeof(mybuf));
if (copy_from_user(mybuf, buf, nbytes))
@ -2354,10 +2338,6 @@ static int lpfc_idiag_cmd_get(const char __user *buf, size_t nbytes,
int i;
size_t bsize;
/* Protect copy from user */
if (!access_ok(VERIFY_READ, buf, nbytes))
return -EFAULT;
memset(mybuf, 0, sizeof(mybuf));
memset(idiag_cmd, 0, sizeof(*idiag_cmd));
bsize = min(nbytes, (sizeof(mybuf)-1));

239
fs/fcntl.c
View File

@ -109,20 +109,34 @@ void __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
}
EXPORT_SYMBOL(__f_setown);
void f_setown(struct file *filp, unsigned long arg, int force)
int f_setown(struct file *filp, unsigned long arg, int force)
{
enum pid_type type;
struct pid *pid;
int who = arg;
struct pid *pid = NULL;
int who = arg, ret = 0;
type = PIDTYPE_PID;
if (who < 0) {
/* avoid overflow below */
if (who == INT_MIN)
return -EINVAL;
type = PIDTYPE_PGID;
who = -who;
}
rcu_read_lock();
pid = find_vpid(who);
__f_setown(filp, pid, type, force);
if (who) {
pid = find_vpid(who);
if (!pid)
ret = -ESRCH;
}
if (!ret)
__f_setown(filp, pid, type, force);
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(f_setown);
@ -307,6 +321,8 @@ static long fcntl_rw_hint(struct file *file, unsigned int cmd,
static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
struct file *filp)
{
void __user *argp = (void __user *)arg;
struct flock flock;
long err = -EINVAL;
switch (cmd) {
@ -334,7 +350,11 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
case F_OFD_GETLK:
#endif
case F_GETLK:
err = fcntl_getlk(filp, cmd, (struct flock __user *) arg);
if (copy_from_user(&flock, argp, sizeof(flock)))
return -EFAULT;
err = fcntl_getlk(filp, cmd, &flock);
if (!err && copy_to_user(argp, &flock, sizeof(flock)))
return -EFAULT;
break;
#if BITS_PER_LONG != 32
/* 32-bit arches must use fcntl64() */
@ -344,7 +364,9 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
/* Fallthrough */
case F_SETLK:
case F_SETLKW:
err = fcntl_setlk(fd, filp, cmd, (struct flock __user *) arg);
if (copy_from_user(&flock, argp, sizeof(flock)))
return -EFAULT;
err = fcntl_setlk(fd, filp, cmd, &flock);
break;
case F_GETOWN:
/*
@ -358,8 +380,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
force_successful_syscall_return();
break;
case F_SETOWN:
f_setown(filp, arg, 1);
err = 0;
err = f_setown(filp, arg, 1);
break;
case F_GETOWN_EX:
err = f_getown_ex(filp, arg);
@ -450,7 +471,9 @@ out:
SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
unsigned long, arg)
{
void __user *argp = (void __user *)arg;
struct fd f = fdget_raw(fd);
struct flock64 flock;
long err = -EBADF;
if (!f.file)
@ -468,14 +491,21 @@ SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
switch (cmd) {
case F_GETLK64:
case F_OFD_GETLK:
err = fcntl_getlk64(f.file, cmd, (struct flock64 __user *) arg);
err = -EFAULT;
if (copy_from_user(&flock, argp, sizeof(flock)))
break;
err = fcntl_getlk64(f.file, cmd, &flock);
if (!err && copy_to_user(argp, &flock, sizeof(flock)))
err = -EFAULT;
break;
case F_SETLK64:
case F_SETLKW64:
case F_OFD_SETLK:
case F_OFD_SETLKW:
err = fcntl_setlk64(fd, f.file, cmd,
(struct flock64 __user *) arg);
err = -EFAULT;
if (copy_from_user(&flock, argp, sizeof(flock)))
break;
err = fcntl_setlk64(fd, f.file, cmd, &flock);
break;
default:
err = do_fcntl(fd, cmd, arg, f.file);
@ -489,57 +519,56 @@ out:
#endif
#ifdef CONFIG_COMPAT
/* careful - don't use anywhere else */
#define copy_flock_fields(from, to) \
(to).l_type = (from).l_type; \
(to).l_whence = (from).l_whence; \
(to).l_start = (from).l_start; \
(to).l_len = (from).l_len; \
(to).l_pid = (from).l_pid;
static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
{
if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
__get_user(kfl->l_type, &ufl->l_type) ||
__get_user(kfl->l_whence, &ufl->l_whence) ||
__get_user(kfl->l_start, &ufl->l_start) ||
__get_user(kfl->l_len, &ufl->l_len) ||
__get_user(kfl->l_pid, &ufl->l_pid))
struct compat_flock fl;
if (copy_from_user(&fl, ufl, sizeof(struct compat_flock)))
return -EFAULT;
copy_flock_fields(*kfl, fl);
return 0;
}
static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
{
struct compat_flock64 fl;
if (copy_from_user(&fl, ufl, sizeof(struct compat_flock64)))
return -EFAULT;
copy_flock_fields(*kfl, fl);
return 0;
}
static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
{
if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
__put_user(kfl->l_type, &ufl->l_type) ||
__put_user(kfl->l_whence, &ufl->l_whence) ||
__put_user(kfl->l_start, &ufl->l_start) ||
__put_user(kfl->l_len, &ufl->l_len) ||
__put_user(kfl->l_pid, &ufl->l_pid))
struct compat_flock fl;
memset(&fl, 0, sizeof(struct compat_flock));
copy_flock_fields(fl, *kfl);
if (copy_to_user(ufl, &fl, sizeof(struct compat_flock)))
return -EFAULT;
return 0;
}
#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
{
if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
__get_user(kfl->l_type, &ufl->l_type) ||
__get_user(kfl->l_whence, &ufl->l_whence) ||
__get_user(kfl->l_start, &ufl->l_start) ||
__get_user(kfl->l_len, &ufl->l_len) ||
__get_user(kfl->l_pid, &ufl->l_pid))
return -EFAULT;
return 0;
}
#endif
#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
{
if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
__put_user(kfl->l_type, &ufl->l_type) ||
__put_user(kfl->l_whence, &ufl->l_whence) ||
__put_user(kfl->l_start, &ufl->l_start) ||
__put_user(kfl->l_len, &ufl->l_len) ||
__put_user(kfl->l_pid, &ufl->l_pid))
struct compat_flock64 fl;
memset(&fl, 0, sizeof(struct compat_flock64));
copy_flock_fields(fl, *kfl);
if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64)))
return -EFAULT;
return 0;
}
#endif
#undef copy_flock_fields
static unsigned int
convert_fcntl_cmd(unsigned int cmd)
@ -556,76 +585,92 @@ convert_fcntl_cmd(unsigned int cmd)
return cmd;
}
/*
* GETLK was successful and we need to return the data, but it needs to fit in
* the compat structure.
* l_start shouldn't be too big, unless the original start + end is greater than
* COMPAT_OFF_T_MAX, in which case the app was asking for trouble, so we return
* -EOVERFLOW in that case. l_len could be too big, in which case we just
* truncate it, and only allow the app to see that part of the conflicting lock
* that might make sense to it anyway
*/
static int fixup_compat_flock(struct flock *flock)
{
if (flock->l_start > COMPAT_OFF_T_MAX)
return -EOVERFLOW;
if (flock->l_len > COMPAT_OFF_T_MAX)
flock->l_len = COMPAT_OFF_T_MAX;
return 0;
}
COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg)
{
mm_segment_t old_fs;
struct flock f;
long ret;
unsigned int conv_cmd;
struct fd f = fdget_raw(fd);
struct flock flock;
long err = -EBADF;
if (!f.file)
return err;
if (unlikely(f.file->f_mode & FMODE_PATH)) {
if (!check_fcntl_cmd(cmd))
goto out_put;
}
err = security_file_fcntl(f.file, cmd, arg);
if (err)
goto out_put;
switch (cmd) {
case F_GETLK:
err = get_compat_flock(&flock, compat_ptr(arg));
if (err)
break;
err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock);
if (err)
break;
err = fixup_compat_flock(&flock);
if (err)
return err;
err = put_compat_flock(&flock, compat_ptr(arg));
break;
case F_GETLK64:
case F_OFD_GETLK:
err = get_compat_flock64(&flock, compat_ptr(arg));
if (err)
break;
err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock);
if (err)
break;
err = fixup_compat_flock(&flock);
if (err)
return err;
err = put_compat_flock64(&flock, compat_ptr(arg));
break;
case F_SETLK:
case F_SETLKW:
ret = get_compat_flock(&f, compat_ptr(arg));
if (ret != 0)
err = get_compat_flock(&flock, compat_ptr(arg));
if (err)
break;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_fcntl(fd, cmd, (unsigned long)&f);
set_fs(old_fs);
if (cmd == F_GETLK && ret == 0) {
/* GETLK was successful and we need to return the data...
* but it needs to fit in the compat structure.
* l_start shouldn't be too big, unless the original
* start + end is greater than COMPAT_OFF_T_MAX, in which
* case the app was asking for trouble, so we return
* -EOVERFLOW in that case.
* l_len could be too big, in which case we just truncate it,
* and only allow the app to see that part of the conflicting
* lock that might make sense to it anyway
*/
if (f.l_start > COMPAT_OFF_T_MAX)
ret = -EOVERFLOW;
if (f.l_len > COMPAT_OFF_T_MAX)
f.l_len = COMPAT_OFF_T_MAX;
if (ret == 0)
ret = put_compat_flock(&f, compat_ptr(arg));
}
err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock);
break;
case F_GETLK64:
case F_SETLK64:
case F_SETLKW64:
case F_OFD_GETLK:
case F_OFD_SETLK:
case F_OFD_SETLKW:
ret = get_compat_flock64(&f, compat_ptr(arg));
if (ret != 0)
err = get_compat_flock64(&flock, compat_ptr(arg));
if (err)
break;
old_fs = get_fs();
set_fs(KERNEL_DS);
conv_cmd = convert_fcntl_cmd(cmd);
ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
set_fs(old_fs);
if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) {
/* need to return lock information - see above for commentary */
if (f.l_start > COMPAT_LOFF_T_MAX)
ret = -EOVERFLOW;
if (f.l_len > COMPAT_LOFF_T_MAX)
f.l_len = COMPAT_LOFF_T_MAX;
if (ret == 0)
ret = put_compat_flock64(&f, compat_ptr(arg));
}
err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock);
break;
default:
ret = sys_fcntl(fd, cmd, arg);
err = do_fcntl(fd, cmd, arg, f.file);
break;
}
return ret;
out_put:
fdput(f);
return err;
}
COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,

97
fs/locks.c
View File

@ -1858,8 +1858,8 @@ EXPORT_SYMBOL(generic_setlease);
*
* Call this to establish a lease on the file. The "lease" argument is not
* used for F_UNLCK requests and may be NULL. For commands that set or alter
* an existing lease, the (*lease)->fl_lmops->lm_break operation must be set;
* if not, this function will return -ENOLCK (and generate a scary-looking
* an existing lease, the ``(*lease)->fl_lmops->lm_break`` operation must be
* set; if not, this function will return -ENOLCK (and generate a scary-looking
* stack trace).
*
* The "priv" pointer is passed directly to the lm_setup function as-is. It
@ -1972,15 +1972,13 @@ EXPORT_SYMBOL(locks_lock_inode_wait);
* @cmd: the type of lock to apply.
*
* Apply a %FL_FLOCK style lock to an open file descriptor.
* The @cmd can be one of
* The @cmd can be one of:
*
* %LOCK_SH -- a shared lock.
*
* %LOCK_EX -- an exclusive lock.
*
* %LOCK_UN -- remove an existing lock.
*
* %LOCK_MAND -- a `mandatory' flock. This exists to emulate Windows Share Modes.
* - %LOCK_SH -- a shared lock.
* - %LOCK_EX -- an exclusive lock.
* - %LOCK_UN -- remove an existing lock.
* - %LOCK_MAND -- a 'mandatory' flock.
* This exists to emulate Windows Share Modes.
*
* %LOCK_MAND can be combined with %LOCK_READ or %LOCK_WRITE to allow other
* processes read and write access respectively.
@ -2086,26 +2084,22 @@ static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
/* Report the first existing lock that would conflict with l.
* This implements the F_GETLK command of fcntl().
*/
int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
{
struct file_lock file_lock;
struct flock flock;
int error;
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
error = -EINVAL;
if ((flock.l_type != F_RDLCK) && (flock.l_type != F_WRLCK))
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
goto out;
error = flock_to_posix_lock(filp, &file_lock, &flock);
error = flock_to_posix_lock(filp, &file_lock, flock);
if (error)
goto out;
if (cmd == F_OFD_GETLK) {
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_GETLK;
@ -2117,15 +2111,12 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
if (error)
goto out;
flock.l_type = file_lock.fl_type;
flock->l_type = file_lock.fl_type;
if (file_lock.fl_type != F_UNLCK) {
error = posix_lock_to_flock(&flock, &file_lock);
error = posix_lock_to_flock(flock, &file_lock);
if (error)
goto rel_priv;
}
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;
rel_priv:
locks_release_private(&file_lock);
out:
@ -2218,26 +2209,16 @@ check_fmode_for_setlk(struct file_lock *fl)
* This implements both the F_SETLK and F_SETLKW commands of fcntl().
*/
int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
struct flock __user *l)
struct flock *flock)
{
struct file_lock *file_lock = locks_alloc_lock();
struct flock flock;
struct inode *inode;
struct inode *inode = locks_inode(filp);
struct file *f;
int error;
if (file_lock == NULL)
return -ENOLCK;
inode = locks_inode(filp);
/*
* This might block, so we do it before checking the inode.
*/
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
*/
@ -2246,7 +2227,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
goto out;
}
error = flock_to_posix_lock(filp, file_lock, &flock);
error = flock_to_posix_lock(filp, file_lock, flock);
if (error)
goto out;
@ -2261,7 +2242,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
switch (cmd) {
case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLK;
@ -2270,7 +2251,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
break;
case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLKW;
@ -2315,26 +2296,22 @@ out:
/* Report the first existing lock that would conflict with l.
* This implements the F_GETLK command of fcntl().
*/
int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
{
struct file_lock file_lock;
struct flock64 flock;
int error;
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
error = -EINVAL;
if ((flock.l_type != F_RDLCK) && (flock.l_type != F_WRLCK))
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
goto out;
error = flock64_to_posix_lock(filp, &file_lock, &flock);
error = flock64_to_posix_lock(filp, &file_lock, flock);
if (error)
goto out;
if (cmd == F_OFD_GETLK) {
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_GETLK64;
@ -2346,13 +2323,9 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
if (error)
goto out;
flock.l_type = file_lock.fl_type;
flock->l_type = file_lock.fl_type;
if (file_lock.fl_type != F_UNLCK)
posix_lock_to_flock64(&flock, &file_lock);
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;
posix_lock_to_flock64(flock, &file_lock);
locks_release_private(&file_lock);
out:
@ -2363,26 +2336,16 @@ out:
* This implements both the F_SETLK and F_SETLKW commands of fcntl().
*/
int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
struct flock64 __user *l)
struct flock64 *flock)
{
struct file_lock *file_lock = locks_alloc_lock();
struct flock64 flock;
struct inode *inode;
struct inode *inode = locks_inode(filp);
struct file *f;
int error;
if (file_lock == NULL)
return -ENOLCK;
/*
* This might block, so we do it before checking the inode.
*/
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
inode = locks_inode(filp);
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
*/
@ -2391,7 +2354,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
goto out;
}
error = flock64_to_posix_lock(filp, file_lock, &flock);
error = flock64_to_posix_lock(filp, file_lock, flock);
if (error)
goto out;
@ -2406,7 +2369,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
switch (cmd) {
case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLK64;
@ -2415,7 +2378,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
break;
case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLKW64;

39
fs/nfsd/vfs.c
View File

@ -1464,41 +1464,34 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
__be32
nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
{
mm_segment_t oldfs;
__be32 err;
int host_err;
const char *link;
struct path path;
DEFINE_DELAYED_CALL(done);
int len;
err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
if (err)
goto out;
if (unlikely(err))
return err;
path.mnt = fhp->fh_export->ex_path.mnt;
path.dentry = fhp->fh_dentry;
err = nfserr_inval;
if (!d_is_symlink(path.dentry))
goto out;
if (unlikely(!d_is_symlink(path.dentry)))
return nfserr_inval;
touch_atime(&path);
/* N.B. Why does this call need a get_fs()??
* Remove the set_fs and watch the fireworks:-) --okir
*/
oldfs = get_fs(); set_fs(KERNEL_DS);
host_err = vfs_readlink(path.dentry, (char __user *)buf, *lenp);
set_fs(oldfs);
link = vfs_get_link(path.dentry, &done);
if (IS_ERR(link))
return nfserrno(PTR_ERR(link));
if (host_err < 0)
goto out_nfserr;
*lenp = host_err;
err = 0;
out:
return err;
out_nfserr:
err = nfserrno(host_err);
goto out;
len = strlen(link);
if (len < *lenp)
*lenp = len;
memcpy(buf, link, *lenp);
do_delayed_call(&done);
return 0;
}
/*

58
fs/statfs.c
View File

@ -244,6 +244,7 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
#ifdef CONFIG_COMPAT
static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
{
struct compat_statfs buf;
if (sizeof ubuf->f_blocks == 4) {
if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
@ -257,20 +258,20 @@ static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *
&& (kbuf->f_ffree & 0xffffffff00000000ULL))
return -EOVERFLOW;
}
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
__put_user(kbuf->f_type, &ubuf->f_type) ||
__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
__put_user(kbuf->f_files, &ubuf->f_files) ||
__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
__put_user(kbuf->f_flags, &ubuf->f_flags) ||
__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
memset(&buf, 0, sizeof(struct compat_statfs));
buf.f_type = kbuf->f_type;
buf.f_bsize = kbuf->f_bsize;
buf.f_blocks = kbuf->f_blocks;
buf.f_bfree = kbuf->f_bfree;
buf.f_bavail = kbuf->f_bavail;
buf.f_files = kbuf->f_files;
buf.f_ffree = kbuf->f_ffree;
buf.f_namelen = kbuf->f_namelen;
buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
buf.f_frsize = kbuf->f_frsize;
buf.f_flags = kbuf->f_flags;
if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs)))
return -EFAULT;
return 0;
}
@ -299,6 +300,7 @@ COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *,
static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
{
struct compat_statfs64 buf;
if (sizeof(ubuf->f_bsize) == 4) {
if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL)
@ -312,20 +314,20 @@ static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstat
&& (kbuf->f_ffree & 0xffffffff00000000ULL))
return -EOVERFLOW;
}
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
__put_user(kbuf->f_type, &ubuf->f_type) ||
__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
__put_user(kbuf->f_files, &ubuf->f_files) ||
__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
__put_user(kbuf->f_flags, &ubuf->f_flags) ||
__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
memset(&buf, 0, sizeof(struct compat_statfs64));
buf.f_type = kbuf->f_type;
buf.f_bsize = kbuf->f_bsize;
buf.f_blocks = kbuf->f_blocks;
buf.f_bfree = kbuf->f_bfree;
buf.f_bavail = kbuf->f_bavail;
buf.f_files = kbuf->f_files;
buf.f_ffree = kbuf->f_ffree;
buf.f_namelen = kbuf->f_namelen;
buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
buf.f_frsize = kbuf->f_frsize;
buf.f_flags = kbuf->f_flags;
if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64)))
return -EFAULT;
return 0;
}

10
include/linux/fs.h
View File

@ -1047,14 +1047,14 @@ static inline struct inode *locks_inode(const struct file *f)
}
#ifdef CONFIG_FILE_LOCKING
extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *);
extern int fcntl_getlk(struct file *, unsigned int, struct flock *);
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
struct flock __user *);
struct flock *);
#if BITS_PER_LONG == 32
extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *);
extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *);
extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
struct flock64 __user *);
struct flock64 *);
#endif
extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
@ -1258,7 +1258,7 @@ extern void fasync_free(struct fasync_struct *);
extern void kill_fasync(struct fasync_struct **, int, int);
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
extern void f_setown(struct file *filp, unsigned long arg, int force);
extern int f_setown(struct file *filp, unsigned long arg, int force);
extern void f_delown(struct file *filp);
extern pid_t f_getown(struct file *filp);
extern int send_sigurg(struct fown_struct *fown);

3
net/socket.c
View File

@ -991,8 +991,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
err = -EFAULT;
if (get_user(pid, (int __user *)argp))
break;
f_setown(sock->file, pid, 1);
err = 0;
err = f_setown(sock->file, pid, 1);
break;
case FIOGETOWN:
case SIOCGPGRP: