diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2013-05-28 15:31:59 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-05-28 15:31:59 +0400 |
| commit | eee06c56784496805b198964c59fa8cd7c00bf48 (patch) | |
| tree | cbdfeadc9a0ee81b83ef012f81dcae1acb0f660f /fs/jbd2/recovery.c | |
| parent | 5d9cf9c6254ddc551fb51072f59dfae60e579736 (diff) | |
| download | linux-eee06c56784496805b198964c59fa8cd7c00bf48.tar.xz | |
jbd2: fix block tag checksum verification brokenness
Al Viro complained of a ton of bogosity with regards to the jbd2 block
tag header checksum. This one checksum is 16 bits, so cut off the
upper 16 bits and treat it as a 16-bit value and don't mess around
with be32* conversions. Fortunately metadata checksumming is still
"experimental" and not in a shipping e2fsprogs, so there should be few
users affected by this.
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/jbd2/recovery.c')
| -rw-r--r-- | fs/jbd2/recovery.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c index 626846bac32f..d4851464b57e 100644 --- a/fs/jbd2/recovery.c +++ b/fs/jbd2/recovery.c @@ -399,18 +399,17 @@ static int jbd2_commit_block_csum_verify(journal_t *j, void *buf) static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag, void *buf, __u32 sequence) { - __u32 provided, calculated; + __u32 csum32; if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) return 1; sequence = cpu_to_be32(sequence); - calculated = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence, - sizeof(sequence)); - calculated = jbd2_chksum(j, calculated, buf, j->j_blocksize); - provided = be32_to_cpu(tag->t_checksum); + csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence, + sizeof(sequence)); + csum32 = jbd2_chksum(j, csum32, buf, j->j_blocksize); - return provided == cpu_to_be32(calculated); + return tag->t_checksum == cpu_to_be16(csum32); } static int do_one_pass(journal_t *journal, |