serpent loopback crypto "EXT2-fs: group descriptors corrupted"

serpent loopback crypto "EXT2-fs: group descriptors corrupted"

[spam goes to /dev/null]

hi,

i created a 10mb file called .enc2 with random data and ran "# losetup -e
serpent -k 128 /dev/loop0 /mnt/hda7/.enc2"
then i ran "# mke2fs /dev/loop0" and tried to "# mount /dev/loop0 /enc". but
i get the following error messages when trying to mount:

May 19 21:32:10 HOST2 kernel: EXT2-fs error (device loop(7,0)):
ext2_check_descriptors: Block bitmap for group 16 not in group (block 0)!
May 19 21:32:10 HOST2 kernel: EXT2-fs: group descriptors corrupted !

im using kernel 2.4.4 patched with crypto patch 2.4.3.1 [and util linux
2.11a patched with the patch from that crypto patch]
i also got the same errors with a 2gb file and by creating the loop device
directly on my 19.5gb /dev/hda7
i tried a few times again and sometimes the encrypted loopback fs works
perfectly, sometimes the error occurs!?
anyone got an idea what this is!? i will supply more information on request


thx for your help
- peter k.

ps: dont kill me if im doing something wrong, this is the first time im
mailing to this list ;)

Re: serpent loopback crypto "EXT2-fs: group descriptors corrupted"

[Jari Ruusu]

spam goes to /dev/null wrote:
> i created a 10mb file called .enc2 with random data and ran "# losetup -e
> serpent -k 128 /dev/loop0 /mnt/hda7/.enc2"
> then i ran "# mke2fs /dev/loop0" and tried to "# mount /dev/loop0 /enc". but
> i get the following error messages when trying to mount:
> 
> May 19 21:32:10 HOST2 kernel: EXT2-fs error (device loop(7,0)):
> ext2_check_descriptors: Block bitmap for group 16 not in group (block 0)!
> May 19 21:32:10 HOST2 kernel: EXT2-fs: group descriptors corrupted !
> 
> im using kernel 2.4.4 patched with crypto patch 2.4.3.1 [and util linux
> 2.11a patched with the patch from that crypto patch]
> i also got the same errors with a 2gb file and by creating the loop device
> directly on my 19.5gb /dev/hda7
> i tried a few times again and sometimes the encrypted loopback fs works
> perfectly, sometimes the error occurs!?
> anyone got an idea what this is!? i will supply more information on request

International crypto patch is misdesigned and broken, period. If you don't
want to play russian roulette with your data, you should consider using
loop-AES package. loop-AES announcement is here:

    http://mail.nl.linux.org/linux-crypto/2001-05/msg00003.html

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>