renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-19 02:34:01 +08:00
Code

xfs: validate log feature fields correctly

Browse Source 
If the large log sector size feature bit is set in the
superblock by accident (say disk corruption), the then
fields that are now considered valid are not checked on
production kernels. The checks are present as ASSERT
statements so cause a panic on a debug kernel.

Change this so that the fields are validity checked if
the feature bit is set and abort the log mount if the
fields do not contain valid values.

Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2009-04-06 18:39:27 +02:00 committed by Christoph Hellwig
parent 1aacc064e0
commit a6cb767e24
1 changed files with 30 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
fs/xfs/xfs_log.c
View File

@ -562,9 +562,8 @@ xfs_log_mount(
}
mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
if (!mp->m_log) {
cmn_err(CE_WARN, "XFS: Log allocation failed: No memory!");
error = ENOMEM;
if (IS_ERR(mp->m_log)) {
error = -PTR_ERR(mp->m_log);
goto out;
}
@ -1180,10 +1179,13 @@ xlog_alloc_log(xfs_mount_t *mp,
xfs_buf_t *bp;
int i;
int iclogsize;
int error = ENOMEM;
log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL);
if (!log)
return NULL;
if (!log) {
xlog_warn("XFS: Log allocation failed: No memory!");
goto out;
}
log->l_mp = mp;
log->l_targ = log_target;
@ -1201,19 +1203,35 @@ xlog_alloc_log(xfs_mount_t *mp,
log->l_grant_reserve_cycle = 1;
log->l_grant_write_cycle = 1;
error = EFSCORRUPTED;
if (xfs_sb_version_hassector(&mp->m_sb)) {
log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
ASSERT(log->l_sectbb_log <= mp->m_sectbb_log);
if (log->l_sectbb_log < 0 ||
log->l_sectbb_log > mp->m_sectbb_log) {
xlog_warn("XFS: Log sector size (0x%x) out of range.",
log->l_sectbb_log);
goto out_free_log;
}
/* for larger sector sizes, must have v2 or external log */
ASSERT(log->l_sectbb_log == 0 ||
log->l_logBBstart == 0 ||
xfs_sb_version_haslogv2(&mp->m_sb));
ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
if (log->l_sectbb_log != 0 &&
(log->l_logBBstart != 0 &&
!xfs_sb_version_haslogv2(&mp->m_sb))) {
xlog_warn("XFS: log sector size (0x%x) invalid "
"for configuration.", log->l_sectbb_log);
goto out_free_log;
}
if (mp->m_sb.sb_logsectlog < BBSHIFT) {
xlog_warn("XFS: Log sector log (0x%x) too small.",
mp->m_sb.sb_logsectlog);
goto out_free_log;
}
}
log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;
xlog_get_iclog_buffer_size(mp, log);
error = ENOMEM;
bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
if (!bp)
goto out_free_log;
@ -1313,7 +1331,8 @@ out_free_iclog:
xfs_buf_free(log->l_xbuf);
out_free_log:
kmem_free(log);
return NULL;
out:
return ERR_PTR(-error);
} /* xlog_alloc_log */