Problem Mounting Encrypted (XOR) Loopback EXT2 Filesystem (2.6.11-1.1369_FC4)

[Nalin Gupta]

Hello All,

I got a Encrypted (XOR) Loopback EXT2 Filesystem image, as part of Monta Vista Previewkit  3.1

I was tring to install MVL3.1 Preview Kit on Fedora Core 4 (2.6.11-1.1369_FC4),  as part of it, "install_previewkit" script needs to mount above Filesystem.

Suggested change was to alter encryption=XOR to encryption=1.

But no success,  and I always gets error like this...
===================================
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

dmesg shows:
VFS: Can't find an ext2 filesystem on dev loop1
===================================

>From Script I found, mount was returning err code 32.

I also found that irrespect of PASSPHRASE, error is same.
Whereas using same PASSPHRASE on redhat90, i get it easily mounted.

Manually verbose mount shows:
=======================
mount: going to use the loop device /dev/loop1
Password: 
set_loop(/dev/loop1,install-components/previewkit/RPMS.image,0): success
mount: setup loop device successfully
del_loop(/dev/loop1): success
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so


Strace Showed:
============
mount("/dev/loop1", "RPMS", "ext2", MS_POSIXACL|MS_ACTIVE|MS_NOUSER|0xec0000, 0x925a000) = -1 EINVAL (Invalid argument)

I doubt in FC4, passphrase is "\n" sensitive. If yes how to avoid it.
I wonder, if this is true, then how come set_loop is success.

regards,
- nalin
				
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