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authorJan Kara <jack@suse.cz>2007-11-14 16:58:56 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-14 18:45:38 -0800
commite47776a0a41a14a5634633c96e590827f552c4b5 (patch)
tree44d5168b83fb1d8d72668728c690116d34f6711f
parent28822f22e18fc3c422f64b5bf0bb1e6c306af634 (diff)
downloadop-kernel-dev-e47776a0a41a14a5634633c96e590827f552c4b5.zip
op-kernel-dev-e47776a0a41a14a5634633c96e590827f552c4b5.tar.gz
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>
-rw-r--r--fs/ext2/ioctl.c5
-rw-r--r--fs/ext3/ioctl.c5
-rw-r--r--fs/ext4/ioctl.c5
-rw-r--r--fs/jfs/ioctl.c3
-rw-r--r--fs/reiserfs/ioctl.c3
5 files changed, 21 insertions, 0 deletions
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index c2324d5..320b2cb 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 4a2a02c..023a070 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 c04c7cc..e7f894b 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 3c8663b..dfda12a 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 c438a8f..e0f0f09 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))
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