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blkid” sees a LUKS UUID and an ext2/swap UUID on the same device. What is wrong?

April 26, 2017device Ext2 luks sees swap UUID wrong

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blkid” sees a LUKS UUID and an ext2/swap UUID on the same device. What is wrong?

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Some old versions of cryptsetup have a bug where the header does not get completely wiped during LUKS format and an older ext2/swap signature remains on the device. This confuses blkid. Fix: Wipe the unused header areas by doing a backup and restore of the header with cryptsetup 1.1.x: cryptsetup luksHeaderBackup –header-backup-file cryptsetup luksHeaderRestore –header-backup-file • cryptsetup segfaults on Gentoo amd64 hardened … There seems to be some inteference between the hardening and and the way cryptsetup benchmarks PBKDF2. The solution to this is currently not quite clear for an encrypted root filesystem.