From: Eric Sandeen <sandeen@sandeen.net>
To: xfs-oss <xfs@oss.sgi.com>, Jesse Stroik <jstroik@ssec.wisc.edu>
Subject: [PATCH V3] xfs_repair: fix agcount*agblocks overflows
Date: Wed, 01 Jul 2009 23:13:59 -0500 [thread overview]
Message-ID: <4A4C3407.60501@sandeen.net> (raw)
In-Reply-To: <4A4BE005.3000102@sandeen.net>
(V3: found another spot with this problem)
The last test in verify_ag_bno() may overflow:
return (agbno >= (sbp->sb_dblocks -
((sbp->sb_agcount - 1) * sbp->sb_agblocks)));
because sb_agcount & sb_agblocks are 32-bit integers; this
may then miss corrupt agbnos for the last ag, which can in
turn lead to out of bounds memory accesses later, for example
when the block nr is used to offset in set_agbno_state():
addr = ba_bmap[(agno)] + (ag_blockno)/XR_BB_NUM;
Similar problems in mk_incore_fstree
Reported-by: Jesse Stroik <jstroik@ssec.wisc.edu>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---
diff --git a/repair/dinode.c b/repair/dinode.c
index fdf52db..84e1d05 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -319,7 +319,8 @@ verify_ag_bno(xfs_sb_t *sbp,
return (agbno >= sbp->sb_agblocks);
if (agno == (sbp->sb_agcount - 1))
return (agbno >= (sbp->sb_dblocks -
- ((sbp->sb_agcount - 1) * sbp->sb_agblocks)));
+ ((xfs_drfsbno_t)(sbp->sb_agcount - 1) *
+ sbp->sb_agblocks)));
return 1;
}
diff --git a/repair/phase5.c b/repair/phase5.c
index 2c243b6..77c7363 100644
--- a/repair/phase5.c
+++ b/repair/phase5.c
@@ -113,7 +113,8 @@ mk_incore_fstree(xfs_mount_t *mp, xfs_agnumber_t agno)
ag_end = mp->m_sb.sb_agblocks;
else
ag_end = mp->m_sb.sb_dblocks -
- mp->m_sb.sb_agblocks * (mp->m_sb.sb_agcount - 1);
+ (xfs_drfsbno_t)mp->m_sb.sb_agblocks *
+ (mp->m_sb.sb_agcount - 1);
/*
* ok, now find the number of extents, keep track of the
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next prev parent reply other threads:[~2009-07-02 4:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-01 20:33 [PATCH] xfs_repair: fix verify_ag_bno() overflow Eric Sandeen
2009-07-01 22:15 ` Eric Sandeen
2009-07-02 4:13 ` Eric Sandeen [this message]
2009-07-02 5:24 ` [PATCH V3] xfs_repair: fix agcount*agblocks overflows Felix Blyakher
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