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-rw-r--r--fs/locks.c97
1 files changed, 30 insertions, 67 deletions
diff --git a/fs/locks.c b/fs/locks.c
index af2031a1fcff..afefeb4ad6de 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -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;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.