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Old 11-22-2011, 12:50 PM
Andy Whitcroft
 
Default jbd/jbd2: validate sb->s_first in journal_get_superblock()

From: Eryu Guan <guaneryu@gmail.com>

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>

(cherry picked from commit 8762202dd0d6e46854f786bdb6fb3780a1625efe)
CVE-2011-4132
BugLink: http://bugs.launchpad.net/bugs/893148
Signed-off-by: Andy Whitcroft <apw@canonical.com>
---
fs/jbd/journal.c | 8 ++++++++
fs/jbd2/journal.c | 8 ++++++++
2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 5d14243..6ad18ba 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -1030,6 +1030,14 @@ static int journal_get_superblock(journal_t *journal)
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
",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;

out:
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 6ddc553..33eb17c 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1029,6 +1029,14 @@ static int journal_get_superblock(journal_t *journal)
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
",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;

out:
--
1.7.5.4


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