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and subject line Bug#330169: util-linux: losetup cannot use "deflate" as crypto
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From: Nick Maynard <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: util-linux: losetup cannot use "deflate" as crypto cipher
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Date: Mon, 26 Sep 2005 14:37:21 +0100
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Package: util-linux
Version: 2.12p-4
Severity: normal
Attempting to use the "deflate" crypto cipher with the losetup program
fails. AES works as expected:
rod:/home/nick# dd if=/dev/zero of=/tmp/compressedFS bs=1024
count=102400
102400+0 records in
102400+0 records out
104857600 bytes transferred in 4.801703 seconds (21837586 bytes/sec)
rod:/home/nick# losetup -e aes -k 256 /dev/loop0 /tmp/compressedFS
Password:
rod:/home/nick# losetup -d /dev/loop0
rod:/home/nick# losetup -e deflate /dev/loop0 /tmp/compressedFS
Password:
ioctl: LOOP_SET_STATUS: Invalid argument
I've tested this on a sarge (both module-based and compiled-in) and an
unstable system with the same results.
The most I can find on this problem is an answerless question on the
linux-crypto list:
http://mail.nl.linux.org/linux-crypto/2004-05/msg00030.html
I can't find any more information to solve this problem, or indeed
determine if it's due to user error.
Thanks,
Nick
-- System Information:
Debian Release: 3.1
Architecture: i386 (i686)
Kernel: Linux 2.6.8-2-386
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages util-linux depends on:
ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an
ii libncurses5 5.4-4 Shared libraries for terminal hand
ii libuuid1 1.37-2sarge1 universally unique id library
ii slang1a-utf8 1.4.9dbs-8 The S-Lang programming library wit
ii zlib1g 1:1.2.2-4.sarge.2 compression library - runtime
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Date: Wed, 28 Sep 2005 13:59:39 +0200
From: Max Vozeler <[EMAIL PROTECTED]>
To: Nick Maynard <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
Subject: Re: Bug#330169: util-linux: losetup cannot use "deflate" as crypto
cipher
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Hi Nick,
On Mon, Sep 26, 2005 at 02:37:21PM +0100, Nick Maynard wrote:
> Attempting to use the "deflate" crypto cipher with the losetup program
> fails. AES works as expected:
The problem is that "deflate" is not a CryptoAPI cipher module, but
a "compress" type module. Those modules don't provide the functions
necessary for use with the loopback driver and losetup is supposed to
fail when trying to use them.
I'm closing the bug because that behaviour is expected for losetup.
Perhaps you could look into squashfs if r/o access is sufficient for
your use. Unfortunately I don't know of any transparently compressing
r/w filesystems on Linux.
cheers,
Max
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