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| author | Theodore Ts'o <tytso@mit.edu> | 2010-06-02 22:04:39 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:22:54 -0700 |
| commit | 94f98453eab3c95eaa40132b2e78cc4edc1bf48f (patch) | |
| tree | 03850faf2d774d4b09dc1c0d53d140533091b6bf | |
| parent | 5ea7d8ced3cb5376b6089ccc2213465e853da71f (diff) | |
ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files
commit 1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72 upstream.
Dan Roseberg has reported a problem with the MOVE_EXT ioctl. If the
donor file is an append-only file, we should not allow the operation
to proceed, lest we end up overwriting the contents of an append-only
file.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/ext4/move_extent.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index d1fc662cc311..d3d6a649e3a7 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -959,6 +959,9 @@ mext_check_arguments(struct inode *orig_inode, return -EINVAL; } + if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) + return -EPERM; + /* Ext4 move extent does not support swapfile */ if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { ext4_debug("ext4 move extent: The argument files should " |