linux-ext4 - Re: EXT3 fuzzing

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Date:	Fri, 27 Oct 2006 11:44:11 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	Eric Sesterhenn / Snakebyte <snakebyte@....de>,
	linux-ext4@...r.kernel.org
Subject: Re: EXT3 fuzzing

Eric Sandeen wrote:
> Eric Sesterhenn / Snakebyte wrote:
>> hi,
>>
>> after fsfuzz
>> (http://www.securityfocus.com/archive/1/449568/30/0/threaded) was
>> released i decided to give it a spin. So far I got two problematic
>> images:
>>
>> http://www.cobra-basket.de/ext3_ls_prozzy_hog.img.bz2
>> 	which makes the kernel use as much cpu as it can get
>>
>> http://www.cobra-basket.de/ext3_memhog.img.bz2
>> 	eats all memory it can get

Works for me w/ that patch:

[root@...k-07 ~]# mount -o loop ext3_ls_prozzy_hog.img mnt/
[root@...k-07 ~]# ls mnt/
[root@...k-07 ~]# dmesg | tail -n 6
EXT3-fs: mounted filesystem with ordered data mode.
EXT3-fs error (device loop0): htree_dirblock_to_tree: bad entry in
directory #2: rec_len % 4 != 0 - offset=24, inode=11, rec_len=989,
name_len=10
Aborting journal on device loop0.
ext3_abort called.
EXT3-fs error (device loop0): ext3_journal_start_sb: Detected aborted
journal
Remounting filesystem read-only

[root@...k-07 ~]# mount -o loop ext3_memhog.img mnt/
[root@...k-07 ~]# ls mnt
[root@...k-07 ~]# dmesg | tail -n 6
EXT3-fs: mounted filesystem with ordered data mode.
EXT3-fs error (device loop0): htree_dirblock_to_tree: bad entry in
directory #2: rec_len is smaller than minimal - offset=0, inode=75,
rec_len=0, name_len=0
Aborting journal on device loop0.
ext3_abort called.
EXT3-fs error (device loop0): ext3_journal_start_sb: Detected aborted
journal
Remounting filesystem read-only

-Eric
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