linux-kernel - Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down

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Message-ID: <CAJZ5v0hp=GJtQ+YnNdaMw6rtbBzNyueY+iqjPkHLKp57t822ZQ@mail.gmail.com>
Date:   Thu, 6 Apr 2017 01:38:10 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        linux-efi@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        matthew.garrett@...ula.com
Subject: Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down

On Wed, Apr 5, 2017 at 10:16 PM, David Howells <dhowells@...hat.com> wrote:
> From: Matthew Garrett <mjg59@...f.ucam.org>
>
> uswsusp allows a user process to dump and then restore kernel state, which
> makes it possible to modify the running kernel.  Disable this if the kernel
> is locked down.
>
> Signed-off-by: Matthew Garrett <mjg59@...f.ucam.org>
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: linux-pm@...r.kernel.org

You probably want to disable hibernation altogether in this case.

Thanks,
Rafael