linux-kernel - Re: [PATCH 0/10] Add additional security checks when module loading is restricted

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Date:	Wed, 28 Aug 2013 23:12:57 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Lenny Szubowicz <lszubowi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Josh Boyer <jwboyer@...hat.com>
Subject: Re: [PATCH 0/10] Add additional security checks when module loading
 is restricted

On Wed, 2013-08-28 at 16:07 -0700, Kees Cook wrote:

> Strictly speaking, RAM contents are not available via /dev/*mem, even
> to root. However, you can request a suspend image be written, but to
> not enter hibernation. Then modify the image, and request a resume
> from it.

Is that true? Oh, hm - I guess you could do it with uswsusp. Ugh. Now I
wonder what else you can do with uswsusp. Yeah, ok, I think that case
certainly needs handling.

-- 
Matthew Garrett <matthew.garrett@...ula.com>