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

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Date:   Thu, 06 Apr 2017 08:39:52 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        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

Am Donnerstag, den 06.04.2017, 01:38 +0200 schrieb Rafael J. Wysocki:
> 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.

Your swap partition may be located on an NVDIMM or be encrypted.
Isn't this a bit overly drastic?

	Regards
		Oliver