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| author | Andrew Morton <akpm@osdl.org> | 2006-12-06 20:37:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:37 -0800 |
| commit | 93f210dd9e614ddab7ecef0b4c9ba6ad3720d860 (patch) | |
| tree | f16d960d7a9e85b2405ae323246e9b6c8aec68bc /fs/ext2/ioctl.c | |
| parent | f5738ceed46782aea7663d62cb6398eb05fc4ce0 (diff) | |
| download | linux-stable-93f210dd9e614ddab7ecef0b4c9ba6ad3720d860.tar.gz linux-stable-93f210dd9e614ddab7ecef0b4c9ba6ad3720d860.tar.bz2 linux-stable-93f210dd9e614ddab7ecef0b4c9ba6ad3720d860.zip | |
[PATCH] protect ext2 ioctl modifying append_only immutable etc with i_mutex
Port commit a090d9132c1e53e3517111123680c15afb25c0a4 into ext2:
All modifications of ->i_flags in inodes that might be visible to somebody
else must be under ->i_mutex. That patch fixes ext2 ioctl() setting S_APPEND.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/ext2/ioctl.c')
| -rw-r--r-- | fs/ext2/ioctl.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c index 1dfba77eab10..e3cf8c81507f 100644 --- a/fs/ext2/ioctl.c +++ b/fs/ext2/ioctl.c @@ -44,6 +44,7 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, if (!S_ISDIR(inode->i_mode)) flags &= ~EXT2_DIRSYNC_FL; + mutex_lock(&inode->i_mutex); oldflags = ei->i_flags; /* @@ -53,13 +54,16 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { - if (!capable(CAP_LINUX_IMMUTABLE)) + if (!capable(CAP_LINUX_IMMUTABLE)) { + mutex_unlock(&inode->i_mutex); return -EPERM; + } } flags = flags & EXT2_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; ei->i_flags = flags; + mutex_unlock(&inode->i_mutex); ext2_set_inode_flags(inode); inode->i_ctime = CURRENT_TIME_SEC; |