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authorEryu Guan <guaneryu@gmail.com>2011-11-01 19:04:59 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-21 13:04:53 -0800
commit903846251193f6545fb3acd1a9a491626a4ed7ce (patch)
tree8571a834b36fcca023f7e27e49eaa24507de0e91 /fs
parent2b8efc69f9d5254856024cb2e883fe9a99e20cf6 (diff)
downloadlwn-903846251193f6545fb3acd1a9a491626a4ed7ce.tar.gz
lwn-903846251193f6545fb3acd1a9a491626a4ed7ce.zip
jbd/jbd2: validate sb->s_first in journal_get_superblock()
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/jbd/journal.c8
-rw-r--r--fs/jbd2/journal.c8
2 files changed, 16 insertions, 0 deletions
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 45905ff762c9..70713d508a0f 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -1070,6 +1070,14 @@ 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\n",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;
out:
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 17af879e6e9e..c00de9c10a0f 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1183,6 +1183,14 @@ 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\n",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;
out: