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

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Message-ID: <20110304215118.GA30253@albatros>
Date:	Sat, 5 Mar 2011 00:51:20 +0300
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Len Brown <len.brown@...el.com>, security@...nel.org,
	linux-pm@...ts.linux-foundation.org, Pavel Machek <pavel@....cz>
Subject: Re: [Security] [PATCH] power: disable hibernation if module
 loading is disabled

On Fri, Mar 04, 2011 at 13:27 -0800, Greg KH wrote:
> 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.
> 
> This sounds like a very unintentional change to the "don't load any
> modules" option, right?  If so, you should really document this
> somewhere, otherwise people are going to get very confused when their
> system suspends suddenly stop working for no obvious reason.

Agreed, thank you.  Is Documentation/sysctl/kernel.txt an appropriate
place?

-- 
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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