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| author | Theodore Ts'o <tytso@mit.edu> | 2018-06-16 20:21:45 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-06-16 20:21:45 -0400 |
| commit | e09463f220ca9a1a1ecfda84fcda658f99a1f12a (patch) | |
| tree | 09dae2d5509c2e2aa36cd621cc81e94e9abbacd2 /fs/jbd2 | |
| parent | 8cdb5240ec5928b20490a2bb34cb87e9a5f40226 (diff) | |
| download | linux-e09463f220ca9a1a1ecfda84fcda658f99a1f12a.tar.gz linux-e09463f220ca9a1a1ecfda84fcda658f99a1f12a.tar.bz2 linux-e09463f220ca9a1a1ecfda84fcda658f99a1f12a.zip | |
jbd2: don't mark block as modified if the handle is out of credits
Do not set the b_modified flag in block's journal head should not
until after we're sure that jbd2_journal_dirty_metadat() will not
abort with an error due to there not being enough space reserved in
the jbd2 handle.
Otherwise, future attempts to modify the buffer may lead a large
number of spurious errors and warnings.
This addresses CVE-2018-10883.
https://bugzilla.kernel.org/show_bug.cgi?id=200071
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/jbd2')
| -rw-r--r-- | fs/jbd2/transaction.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 51dd68e67b0f..c0b66a7a795b 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1361,6 +1361,13 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh) if (jh->b_transaction == transaction && jh->b_jlist != BJ_Metadata) { jbd_lock_bh_state(bh); + if (jh->b_transaction == transaction && + jh->b_jlist != BJ_Metadata) + pr_err("JBD2: assertion failure: h_type=%u " + "h_line_no=%u block_no=%llu jlist=%u\n", + handle->h_type, handle->h_line_no, + (unsigned long long) bh->b_blocknr, + jh->b_jlist); J_ASSERT_JH(jh, jh->b_transaction != transaction || jh->b_jlist == BJ_Metadata); jbd_unlock_bh_state(bh); @@ -1380,11 +1387,11 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh) * of the transaction. This needs to be done * once a transaction -bzzz */ - jh->b_modified = 1; if (handle->h_buffer_credits <= 0) { ret = -ENOSPC; goto out_unlock_bh; } + jh->b_modified = 1; handle->h_buffer_credits--; } |