GNU bug report logs - #66746
LUKS password prompt invisible, prompts twice

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Message #11 received at 66746 <at> debbugs.gnu.org (full text, mbox):

From: Josselin Poiret <dev <at> jpoiret.xyz>
To: Caleb Herbert <csh <at> bluehome.net>, 66746 <at> debbugs.gnu.org
Subject: Re: bug#66746: LUKS password prompt invisible, prompts twice
Date: Fri, 27 Oct 2023 20:44:55 +0200

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Hi Caleb,

Caleb Herbert <csh <at> bluehome.net> writes:

> Hardware: ThinkPad X200
> Firmware: Libreboot 2016
> OS: Guix System
>
> Expected behavior:
> Password prompt. Enter LUKS passphrase. Log into computer.
>
> Actual behavior:
> Password prompt. Enter LUKS passphrase. Select boot option from GRUB menu. Hangs, no password prompt. Enter passphrase (again) anyway: Boots normally.

I think this is a combination of two things: first, we currently need to
unlock the drive once for GRUB, and then once when Linux boots, hence
the two password prompts.  This is a known limitation, but the usual
workaround of adding a keyfile to the initrd wouldn't work in our case
for security reasons: the keyfile would end up in the store and be
world-readable, a disaster.

Regarding the second prompt being invisible, I think it might be related
to the framebuffer initialization for Libreboot since there have been
lots of reports about this.  I don't know anything myself, but maybe
someone else could chime in?

Best,
-- 
Josselin Poiret

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