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| 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/ext2/ioctl.c | |
| parent | 28822f22e18fc3c422f64b5bf0bb1e6c306af634 (diff) | |
| download | linux-3.10-e47776a0a41a14a5634633c96e590827f552c4b5.tar.gz linux-3.10-e47776a0a41a14a5634633c96e590827f552c4b5.tar.bz2 linux-3.10-e47776a0a41a14a5634633c96e590827f552c4b5.zip | |
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/ext2/ioctl.c')
| -rw-r--r-- | fs/ext2/ioctl.c | 5 |
1 files changed, 5 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; /* |