ext4: always verify the magic number in xattr blocks

commit 513f86d73855ce556ea9522b6bfd79f87356dc3a upstream.

If there an inode points to a block which is also some other type of
metadata block (such as a block allocation bitmap), the
buffer_verified flag can be set when it was validated as that other
metadata block type; however, it would make a really terrible external
attribute block.  The reason why we use the verified flag is to avoid
constantly reverifying the block.  However, it doesn't take much
overhead to make sure the magic number of the xattr block is correct,
and this will avoid potential crashes.

This addresses CVE-2018-10879.

https://bugzilla.kernel.org/show_bug.cgi?id=200001

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index e5abf939989a84da86bb737e49b84f754c1a6fa5..871278eac8ba53bf8d919fdb2a85df734556e367 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -229,12 +229,12 @@ __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh,
 {
        int error = -EFSCORRUPTED;
 
-       if (buffer_verified(bh))
-               return 0;
-
        if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) ||
            BHDR(bh)->h_blocks != cpu_to_le32(1))
                goto errout;
+       if (buffer_verified(bh))
+               return 0;
+
        error = -EFSBADCRC;
        if (!ext4_xattr_block_csum_verify(inode, bh))
                goto errout;