diff options
| author | Jan Kara <jack@suse.cz> | 2007-11-14 16:58:56 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-11-14 18:45:38 -0800 |
| commit | e47776a0a41a14a5634633c96e590827f552c4b5 (patch) | |
| tree | 44d5168b83fb1d8d72668728c690116d34f6711f /fs | |
| parent | 28822f22e18fc3c422f64b5bf0bb1e6c306af634 (diff) | |
Forbid user to change file flags on quota files
Forbid user from changing file flags on quota files. User has no bussiness
in playing with these flags when quota is on. Furthermore there is a
remote possibility of deadlock due to a lock inversion between quota file's
i_mutex and transaction's start (i_mutex for quota file is locked only when
trasaction is started in quota operations) in ext3 and ext4.
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: LIOU Payphone <lioupayphone@gmail.com>
Cc: <linux-ext4@vger.kernel.org>
Acked-by: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext2/ioctl.c | 5 | ||||
| -rw-r--r-- | fs/ext3/ioctl.c | 5 | ||||
| -rw-r--r-- | fs/ext4/ioctl.c | 5 | ||||
| -rw-r--r-- | fs/jfs/ioctl.c | 3 | ||||
| -rw-r--r-- | fs/reiserfs/ioctl.c | 3 |
5 files changed, 21 insertions, 0 deletions
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c index c2324d5fe4a..320b2cb3d4d 100644 --- a/fs/ext2/ioctl.c +++ b/fs/ext2/ioctl.c @@ -47,6 +47,11 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, flags &= ~EXT2_DIRSYNC_FL; mutex_lock(&inode->i_mutex); + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) { + mutex_unlock(&inode->i_mutex); + return -EPERM; + } oldflags = ei->i_flags; /* diff --git a/fs/ext3/ioctl.c b/fs/ext3/ioctl.c index 4a2a02c95bf..023a070f55f 100644 --- a/fs/ext3/ioctl.c +++ b/fs/ext3/ioctl.c @@ -51,6 +51,11 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, flags &= ~EXT3_DIRSYNC_FL; mutex_lock(&inode->i_mutex); + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) { + mutex_unlock(&inode->i_mutex); + return -EPERM; + } oldflags = ei->i_flags; /* The JOURNAL_DATA flag is modifiable only by root */ diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index c04c7ccba9e..e7f894bdb42 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -51,6 +51,11 @@ int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, flags &= ~EXT4_DIRSYNC_FL; mutex_lock(&inode->i_mutex); + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) { + mutex_unlock(&inode->i_mutex); + return -EPERM; + } oldflags = ei->i_flags; /* The JOURNAL_DATA flag is modifiable only by root */ diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c index 3c8663bea98..dfda12a073e 100644 --- a/fs/jfs/ioctl.c +++ b/fs/jfs/ioctl.c @@ -79,6 +79,9 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, if (!S_ISDIR(inode->i_mode)) flags &= ~JFS_DIRSYNC_FL; + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) + return -EPERM; jfs_get_inode_flags(jfs_inode); oldflags = jfs_inode->mode2; diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c index c438a8f83f2..e0f0f098a52 100644 --- a/fs/reiserfs/ioctl.c +++ b/fs/reiserfs/ioctl.c @@ -57,6 +57,9 @@ int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, if (get_user(flags, (int __user *)arg)) return -EFAULT; + /* Is it quota file? Do not allow user to mess with it. */ + if (IS_NOQUOTA(inode)) + return -EPERM; if (((flags ^ REISERFS_I(inode)-> i_attrs) & (REISERFS_IMMUTABLE_FL | REISERFS_APPEND_FL)) |