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authorTheodore Ts'o <tytso@mit.edu>2010-06-02 22:04:39 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-06-02 22:04:39 -0400
commit1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72 (patch)
tree471ac26edd4fbdfda5a3b091b9d583d579c882cb
parent67a3e12b05e055c0415c556a315a3d3eb637e29e (diff)
ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files
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>
-rw-r--r--fs/ext4/move_extent.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 3a6c92ac131c..52abfa12762a 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -960,6 +960,9 @@ 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 "

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