From: Eric Sandeen <sandeen@redhat.com>
To: xfs-oss <xfs@oss.sgi.com>
Subject: [PATCH] xfs: sanitize sb_inopblock in xfs_mount_validate_sb
Date: Tue, 28 Jan 2014 22:28:07 -0600 [thread overview]
Message-ID: <52E88357.6090104@redhat.com> (raw)
xfs_mount_validate_sb doesn't check sb_inopblock for sanity
(as does its xfs_repair counterpart, FWIW).
If it's out of bounds, we can go off the rails in i.e.
xfs_inode_buf_verify(), which uses sb_inopblock as a loop
limit when stepping through a metadata buffer.
The problem can be demonstrated easily by corrupting
sb_inopblock with xfs_db and trying to mount the result:
# mkfs.xfs -dfile,name=fsfile,size=1g
# xfs_db -x fsfile
xfs_db> sb 0
xfs_db> write inopblock 512
inopblock = 512
xfs_db> quit
# mount -o loop fsfile mnt
and we blow up in xfs_inode_buf_verify().
With this patch, we get a (very noisy) corruption error,
and fail the mount as we should.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
diff --git a/fs/xfs/xfs_sb.c b/fs/xfs/xfs_sb.c
index b7c9aea..511cce9 100644
--- a/fs/xfs/xfs_sb.c
+++ b/fs/xfs/xfs_sb.c
@@ -288,6 +288,7 @@ xfs_mount_validate_sb(
sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
sbp->sb_inodesize != (1 << sbp->sb_inodelog) ||
+ sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
(sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
(sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
(sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
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next reply other threads:[~2014-01-29 4:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-29 4:28 Eric Sandeen [this message]
2014-01-29 14:58 ` [PATCH] xfs: sanitize sb_inopblock in xfs_mount_validate_sb Jeff Liu
2014-01-30 20:26 ` Brian Foster
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