[PATCH AUTOSEL 6.0 13/32] gfs2: Check sb_bsize_shift after reading superblock

Sasha Levin
2022-10-18T00:09:01Z

From: Andrew Price <anprice@redhat.com>

[ Upstream commit 670f8ce56dd0632dc29a0322e188cc73ce3c6b92 ]

Fuzzers like to scribble over sb_bsize_shift but in reality it's very
unlikely that this field would be corrupted on its own. Nevertheless it
should be checked to avoid the possibility of messy mount errors due to
bad calculations. It's always a fixed value based on the block size so
we can just check that it's the expected value.

Tested with:

mkfs.gfs2 -O -p lock_nolock /dev/vdb
for i in 0 -1 64 65 32 33; do
gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb
mount /dev/vdb /mnt/test && umount /mnt/test
done

Before this patch we get a withdraw after

[ 76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block
[ 76.413681] bh = 19 (type: exp=5, found=4)
[ 76.413681] function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492

and with UBSAN configured we also get complaints like

[ 76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19
[ 76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int'

After the patch, these complaints don't appear, mount fails immediately
and we get an explanation in dmesg.

Reported-by: syzbot+dcf33a7aae997956fe06@syzkaller.appspotmail.com
Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/gfs2/ops_fstype.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 236b59ef93b6..c7e2e6238366 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -178,7 +178,10 @@ static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
pr_warn("Invalid block size\n");
return -EINVAL;
}
-
+ if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
+ pr_warn("Invalid block size shift\n");
+ return -EINVAL;
+ }
return 0;
}

--
2.35.1