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SubjectRe: [PATCH] Re: Corrupted XFS log replay oops.
On Thu, Jan 22, 2009 at 01:11:58AM -0500, Christoph Hellwig wrote:
> On Thu, Jan 22, 2009 at 03:37:47PM +1100, Dave Chinner wrote:
> > xfs_buf_t *
> > xlog_get_bp(
> > xlog_t *log,
> > - int num_bblks)
> > + int nbblks)
>
> Any reason for reanming this variable? That causes quite a bit of
> churn.
>
> > {
> > - ASSERT(num_bblks > 0);
> > + if (nbblks <= 0 || nbblks > log->l_logBBsize) {
> > + xlog_warn("XFS: Invalid block length (0x%x) given for buffer", nbblks);
>
> And doesn't prevent this line from needing a linebreak to stay under 80
> characters :)

And now with line breaks.

------
[XFS] Check buffer lengths in log recovery

Before trying to obtain, read or write a buffer,
check that the buffer length is actually valid. If
it is not valid, then something read in the recovery
process has been corrupted and we should abort
recovery.

Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Tested-by: Eric Sesterhenn <snakebyte@gmx.de>
---
fs/xfs/xfs_log_recover.c | 34 ++++++++++++++++++++++++++++------
1 files changed, 28 insertions(+), 6 deletions(-)
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 35cca98..a37e4aa 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -70,16 +70,22 @@ STATIC void xlog_recover_check_summary(xlog_t *);
xfs_buf_t *
xlog_get_bp(
xlog_t *log,
- int num_bblks)
+ int nbblks)
{
- ASSERT(num_bblks > 0);
+ if (nbblks <= 0 || nbblks > log->l_logBBsize) {
+ xlog_warn("XFS: Invalid block length (0x%x) given for buffer",
+ nbblks);
+ XFS_ERROR_REPORT("xlog_get_bp(1)",
+ XFS_ERRLEVEL_HIGH, log->l_mp);
+ return NULL;
+ }

if (log->l_sectbb_log) {
- if (num_bblks > 1)
- num_bblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
- num_bblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, num_bblks);
+ if (nbblks > 1)
+ nbblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
+ nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
}
- return xfs_buf_get_noaddr(BBTOB(num_bblks), log->l_mp->m_logdev_targp);
+ return xfs_buf_get_noaddr(BBTOB(nbblks), log->l_mp->m_logdev_targp);
}

void
@@ -102,6 +108,14 @@ xlog_bread(
{
int error;

+ if (nbblks <= 0 || nbblks > log->l_logBBsize) {
+ xlog_warn("XFS: Invalid block length (0x%x) given for buffer",
+ nbblks);
+ XFS_ERROR_REPORT("xlog_bread(1)",
+ XFS_ERRLEVEL_HIGH, log->l_mp);
+ return EFSCORRUPTED;
+ }
+
if (log->l_sectbb_log) {
blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
@@ -139,6 +153,14 @@ xlog_bwrite(
{
int error;

+ if (nbblks <= 0 || nbblks > log->l_logBBsize) {
+ xlog_warn("XFS: Invalid block length (0x%x) given for buffer",
+ nbblks);
+ XFS_ERROR_REPORT("xlog_bwrite(1)",
+ XFS_ERRLEVEL_HIGH, log->l_mp);
+ return EFSCORRUPTED;
+ }
+
if (log->l_sectbb_log) {
blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);

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