linux-kernel - Re: [PATCH 09/27] hibernate: Disable when the kernel is locked down

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Message-ID: <20190307145528.24c1b4d3@alans-desktop>
Date:   Thu, 7 Mar 2019 14:55:28 +0000
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Matthew Garrett <matthewgarrett@...gle.com>
Cc:     jmorris@...ei.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: Re: [PATCH 09/27] hibernate: Disable when the kernel is locked down

On Wed,  6 Mar 2019 15:58:55 -0800
Matthew Garrett <matthewgarrett@...gle.com> wrote:

> From: Josh Boyer <jwboyer@...oraproject.org>
> 
> There is currently no way to verify the resume image when returning
> from hibernate.  This might compromise the signed modules trust model,
> so until we can work with signed hibernate images we disable it when the
> kernel is locked down.

That one is a bit worrying since whilst the other stuff may be useful in
some business environments, mandatory hibernate not suspend to RAM is a
common corporate IT policy because of concerns about theft and recovery
of memory contents.

Alan