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libxfs: add more bounds checking to sb sanity checks 

Current sb verifier doesn't check bounds on sb_fdblocks and sb_ifree.
Add sanity checks for these parameters.

Signed-off-by: Bill O'Donnell <billodo@redhat.com>
[darrick: port to refactored sb validation predicates]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Bill O'Donnell 2018-07-26 10:10:34 -07:00 committed by Darrick J. Wong
parent eca383fcd6
commit 8756a5af18
1 changed files with 12 additions and 0 deletions
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12
fs/xfs/libxfs/xfs_sb.c
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@ -150,6 +150,18 @@ xfs_validate_sb_write(
struct xfs_mount *mp, struct xfs_mount *mp,
struct xfs_sb *sbp) struct xfs_sb *sbp)
{ {
/*
* Carry out additional sb summary counter sanity checks when we write
* the superblock. We skip this in the read validator because there
* could be newer superblocks in the log and if the values are garbage
* we'll recalculate them at the end of log mount.
*/
if (sbp->sb_fdblocks > sbp->sb_dblocks ||
sbp->sb_ifree > sbp->sb_icount) {
xfs_warn(mp, "SB summary counter sanity check failed");
return -EFSCORRUPTED;
}
if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5) if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
return 0; return 0;