[systemd-bugs] [Bug 87717] New: offset is ignored in /etc/crypttab

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87717

            Bug ID: 87717
           Summary: offset is ignored in /etc/crypttab
           Product: systemd
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: vecu.bosseur at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

Dear Developpers,

My /etc/crypttab contains:

cryptswap1 UUID=c836dd13-1b4e-4bfb-9be5-6e5d972aa75a /dev/urandom
swap,offset=2048,cipher=aes-cbc-essiv:sha256

And my /etc/fstab contains:

/dev/mapper/cryptswap1 none swap sw 0 0

And this worked fine with cryptdisks_start however the option "offset" is not
understood by systemd 215. I did change init system from sysvinit to systemd,
and now, after 2 reboots, I don't have any swap and my device that had UUID
c836dd13-1b4e-4bfb-9be5-6e5d972aa75a has seen its start erased, and thus its
UUID itself, as if I had not mentioned an offset=>>0 in crypttab.

The use case for "offset=2048" is to be able to use a UUID to identify the
partition I want to have encrypted swap on.  Not using an offset=>>0 parameter
would unconditionally erase the whole partition, including the portion where
its UUID is stored. Using any other way to identify a partition can thus cause
data loss if I reparttion my disk and forget to update /etc/crypttab.

Please make systemd understand the "offset=" paramater of /etc/crypttab.

Has this problem been addressed in a subsequent systemd version?

Note: related to debian bug #751707
( https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751707 )

Thanks,
Vecu Bosseur

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