linux-kernel - Re: [PATCH] power: disable hibernation if module loading is disabled

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Message-ID: <20110304184324.GQ372@outflux.net>
Date:	Fri, 4 Mar 2011 10:43:24 -0800
From:	Kees Cook <kees.cook@...onical.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	linux-kernel@...r.kernel.org, security@...nel.org,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH] power: disable hibernation if module loading is disabled

On Fri, Mar 04, 2011 at 07:11:24PM +0300, Vasiliy Kulikov wrote:
> If /proc/sys/kernel/modules_disabled is set to 1, then nobody (even full
> root) may not read/write arbitrary kernel memory.  In spite of it,
> hibernation allows anyone with an access to either /dev/snapshot or
> /sys/power/ make the full snapshot of the system.  This snapshot may be
> freely changed and uploaded back.

Ah, yes please. I'd like to try to have ways to close all the
"intentional" arbitrary memory writing interfaces. Hooking it to
modules_disable seems as good as any other toggle. Still waiting to hear
anything on this: http://article.gmane.org/gmane.linux.acpi.devel/49471

Acked-by: Kees Cook <kees.cook@...onical.com>

-- 
Kees Cook
Ubuntu Security Team
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