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Subject[PATCH 59/91] jbd/jbd2: validate sb->s_first in journal_get_superblock()
2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------
commit 8762202dd0d6e46854f786bdb6fb3780a1625efe upstream.

I hit a J_ASSERT(blocknr != 0) failure in cleanup_journal_tail() when
mounting a fsfuzzed ext3 image. It turns out that the corrupted ext3
image has s_first = 0 in journal superblock, and the 0 is passed to
journal->j_head in journal_reset(), then to blocknr in
cleanup_journal_tail(), in the end the J_ASSERT failed.

So validate s_first after reading journal superblock from disk in
journal_get_superblock() to ensure s_first is valid.

The following script could reproduce it:

fstype=ext3
blocksize=1024
img=$fstype.img
offset=0
found=0
magic="c0 3b 39 98"

dd if=/dev/zero of=$img bs=1M count=8
mkfs -t $fstype -b $blocksize -F $img
filesize=`stat -c %s $img`
while [ $offset -lt $filesize ]
do
if od -j $offset -N 4 -t x1 $img | grep -i "$magic";then
echo "Found journal: $offset"
found=1
break
fi
offset=`echo "$offset+$blocksize" | bc`
done
if [ $found -ne 1 ];then
echo "Magic \"$magic\" not found"
exit 1
fi

dd if=/dev/zero of=$img seek=$(($offset+23)) conv=notrunc bs=1 count=1

mkdir -p ./mnt
mount -o loop $img ./mnt

Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Moritz Mühlenhoff <jmm@inutil.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/jbd/journal.c | 8 ++++++++
fs/jbd2/journal.c | 8 ++++++++
2 files changed, 16 insertions(+), 0 deletions(-)
Index: longterm-2.6.27/fs/jbd/journal.c
===================================================================
--- longterm-2.6.27.orig/fs/jbd/journal.c 2012-02-05 22:34:33.178914769 +0100
+++ longterm-2.6.27/fs/jbd/journal.c 2012-02-05 22:34:43.263916090 +0100
@@ -1030,6 +1030,14 @@
goto out;
}

+ if (be32_to_cpu(sb->s_first) == 0 ||
+ be32_to_cpu(sb->s_first) >= journal->j_maxlen) {
+ printk(KERN_WARNING
+ "JBD: Invalid start block of journal: %u\n",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;

out:
Index: longterm-2.6.27/fs/jbd2/journal.c
===================================================================
--- longterm-2.6.27.orig/fs/jbd2/journal.c 2012-02-05 22:34:33.183914664 +0100
+++ longterm-2.6.27/fs/jbd2/journal.c 2012-02-05 22:34:43.272916600 +0100
@@ -1369,6 +1369,14 @@
goto out;
}

+ if (be32_to_cpu(sb->s_first) == 0 ||
+ be32_to_cpu(sb->s_first) >= journal->j_maxlen) {
+ printk(KERN_WARNING
+ "JBD2: Invalid start block of journal: %u\n",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;

out:

--
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