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| author | Darrick J. Wong <djwong@us.ibm.com> | 2012-05-27 08:08:24 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-05-27 08:08:24 -0400 |
| commit | 42a7106de636ebf9c0b93d25b4230e14f5f2682e (patch) | |
| tree | 321f2e97768bc12962babb018004f8f6b1f7e57f /fs/jbd2/recovery.c | |
| parent | 4fd5ea43bc11602bfabe2c8f5378586d34bd2b0a (diff) | |
| download | linux-42a7106de636ebf9c0b93d25b4230e14f5f2682e.tar.gz linux-42a7106de636ebf9c0b93d25b4230e14f5f2682e.tar.xz | |
jbd2: checksum revocation blocks
Compute and verify revoke blocks inside the journal.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/recovery.c')
| -rw-r--r-- | fs/jbd2/recovery.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c index 980f3d6b5f88..728ecd0705d9 100644 --- a/fs/jbd2/recovery.c +++ b/fs/jbd2/recovery.c @@ -706,6 +706,25 @@ static int do_one_pass(journal_t *journal, return err; } +static int jbd2_revoke_block_csum_verify(journal_t *j, + void *buf) +{ + struct jbd2_journal_revoke_tail *tail; + __u32 provided, calculated; + + if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) + return 1; + + tail = (struct jbd2_journal_revoke_tail *)(buf + j->j_blocksize - + sizeof(struct jbd2_journal_revoke_tail)); + provided = tail->r_checksum; + tail->r_checksum = 0; + calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize); + tail->r_checksum = provided; + + provided = be32_to_cpu(provided); + return provided == calculated; +} /* Scan a revoke record, marking all blocks mentioned as revoked. */ @@ -720,6 +739,9 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh, offset = sizeof(jbd2_journal_revoke_header_t); max = be32_to_cpu(header->r_count); + if (!jbd2_revoke_block_csum_verify(journal, header)) + return -EINVAL; + if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) record_len = 8; |