Package: linux-image-2.6.18-3-ixp4xx Version: 2.6.18-8 Severity: critical Justification: causes serious data loss
This is on an NSLU2, I wanted to use it to access some disks that I had used previously on another system that had encrypted partitons. However, when I tried cryptsetup luksOpen, I got a automatic header conversion from 0.99 to 0.991 triggered message, and then an infinite loop. Trying the same partition on the other system, now I get the same thing - its header is corrupted. Luckily, I'm paranoid and had a backup of the LUKS header! If I didn't have this, the whole partition's data would probably be lost. Here's the result of some tests - and its stranger than you think... Used cryptsetup luksFormat on another system to set up a partition.. LKG8A754B:~# uname -a Linux LKG8A754B 2.6.18-3-ixp4xx #1 Mon Dec 11 17:20:00 UTC 2006 armv5tel GNU/Linux !!! ... after some experiments corrupting it... now I restore it again and decide to strace things... !!! LKG8A754B:~# dd < sde4-luks-header-backup > /dev/sde4 150+0 records in 150+0 records out 76800 bytes (77 kB) copied, 0.0148216 seconds, 5.2 MB/s LKG8A754B:~# strace 2>trace cryptsetup luksOpen /dev/sde4 sde4 Enter LUKS passphrase: key slot 0 unlocked. !!! Hey, that just worked !!! LKG8A754B:~# ls -l /dev/mapper/sde4 brw-rw---- 1 root disk 254, 0 Dec 17 02:00 /dev/mapper/sde4 LKG8A754B:~# cmp -l /dev/sde4 sde4-luks-header-backup cmp: EOF on sde4-luks-header-backup !!! But: !!! LKG8A754B:~# cryptsetup remove sde4 !!! no strace !!! LKG8A754B:~# cryptsetup luksOpen /dev/sde4 sde4 Enter LUKS passphrase: automatic header conversion from 0.99 to 0.991 triggered <ctrl-c> LKG8A754B:~# cmp -l /dev/sde4 sde4-luks-header-backup 168 0 12 513 114 0 514 125 0 515 113 0 516 123 0 517 272 0 518 276 0 520 1 0 521 141 0 522 145 0 523 163 0 539 0 3 540 0 10 543 0 17 544 0 240 553 143 0 554 142 0 555 143 0 556 55 0 557 145 0 558 163 0 559 163 0 560 151 0 561 166 0 562 72 0 563 163 0 564 150 0 565 141 0 566 62 0 567 65 0 568 66 0 585 163 0 586 150 0 587 141 3 588 61 210 591 0 17 592 0 240 cmp: EOF on sde4-luks-header-backup LKG8A754B:~# !!! Its done something like overwrite the second sector of the header with the first one. I had a look at the cryptsetup code, and the conversion message is triggered by it finding the wrong state code for the passphrase slot - so the data has been overwritten by the time its got there. This is reliable - it always seems to corrupt it without strace, always works with!??? Err.... -- System Information: Debian Release: 4.0 APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing') Architecture: arm (armv5tel) Shell: /bin/sh linked to /bin/dash Kernel: Linux 2.6.18-3-ixp4xx Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Versions of packages linux-image-2.6.18-3-ixp4xx depends on: ii coreutils 5.97-5 The GNU core utilities ii debconf [debconf-2.0] 1.5.8 Debian configuration management sy ii initramfs-tools [linux-initra 0.85c tools for generating an initramfs ii module-init-tools 3.3-pre3-1 tools for managing Linux kernel mo linux-image-2.6.18-3-ixp4xx recommends no packages. -- debconf information: linux-image-2.6.18-3-ixp4xx/preinst/failed-to-move-modules-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/preinst/overwriting-modules-2.6.18-3-ixp4xx: true shared/kernel-image/really-run-bootloader: true linux-image-2.6.18-3-ixp4xx/postinst/kimage-is-a-directory: linux-image-2.6.18-3-ixp4xx/preinst/lilo-has-ramdisk: linux-image-2.6.18-3-ixp4xx/preinst/lilo-initrd-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/preinst/elilo-initrd-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/preinst/initrd-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/preinst/bootloader-initrd-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/postinst/old-initrd-link-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/preinst/abort-install-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/postinst/old-system-map-link-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/postinst/old-dir-initrd-link-2.6.18-3-ixp4xx: true * linux-image-2.6.18-3-ixp4xx/preinst/already-running-this-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/postinst/bootloader-error-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/postinst/depmod-error-2.6.18-3-ixp4xx: false linux-image-2.6.18-3-ixp4xx/prerm/would-invalidate-boot-loader-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/prerm/removing-running-kernel-2.6.18-3-ixp4xx: true linux-image-2.6.18-3-ixp4xx/postinst/bootloader-test-error-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/preinst/abort-overwrite-2.6.18-3-ixp4xx: linux-image-2.6.18-3-ixp4xx/postinst/depmod-error-initrd-2.6.18-3-ixp4xx: false linux-image-2.6.18-3-ixp4xx/postinst/create-kimage-link-2.6.18-3-ixp4xx: true -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
