[pkg-cryptsetup-devel] Bug#541835: cryptsetup: unclear kernel requirements

[Celejar]

Package: cryptsetup
Version: 2:1.0.7-1
Severity: normal


This is not really a bug, but it's at least a request for better documentation.

I have a standard LUKS volume (created by the Debian installer), using
aes-cbc-essiv:sha_256.  While stock Debian kernels as well as ones that I build
based on the stock config handle it fine, my 'lean' kernel configurations
choke as follows:

table:254:0:	error allocating crypto tfm
ioctl:		error adding target to table
ioctl:		device doesn't appear to be in the dev hash table
Command failed: failed to setup dm-crypt key mapping for device /dev/hda4
Check that kernel supports aes-cbc-essiv:sha_256 cipher

I have googled extensively, and this message apparently usually indicates that
kernel support for the appropriate cipher / hash is not available, but I've
checked, double-checked, and racked my brains to figure out what I could
possibly be missing, to no avail.  aes_generic.ko, cbc.ko, crypto_blkcipher.ko,
sha256_generic.ko, dm-crypt.ko, dm-mod.ko are all there.

I've obviously disabled something that cryptsetup needs, but what?  Google
turns up nothing current and useful.

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.31-rc6 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages cryptsetup depends on:
ii  dmsetup                      2:1.02.30-3 The Linux Kernel Device Mapper use
ii  libc6                        2.9-24      GNU C Library: Shared libraries
ii  libdevmapper1.02.1           2:1.02.30-3 The Linux Kernel Device Mapper use
ii  libpopt0                     1.14-4      lib for parsing cmdline parameters
ii  libuuid1                     2.16-3      Universally Unique ID library

cryptsetup recommends no packages.

Versions of packages cryptsetup suggests:
pn  dosfstools                    <none>     (no description available)
ii  initramfs-tools [linux-initra 0.93.4     tools for generating an initramfs
ii  udev                          0.141-1    /dev/ and hotplug management daemo

-- no debconf information