From: Vasiliy Kulikov <segoon@openwall.com>
To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
Len Brown <len.brown@intel.com>,
security@kernel.org, linux-pm@lists.linux-foundation.org,
Pavel Machek <pavel@ucw.cz>
Subject: Re: [Security] [PATCH] power: disable hibernation if module loading is disabled
Date: Sat, 5 Mar 2011 00:51:20 +0300 [thread overview]
Message-ID: <20110304215118.GA30253@albatros> (raw)
In-Reply-To: <20110304212709.GA28680@kroah.com>
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
next prev parent reply other threads:[~2011-03-04 21:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-04 16:11 Vasiliy Kulikov
2011-03-04 18:43 ` Kees Cook
2011-03-04 20:48 ` Rafael J. Wysocki
2011-03-04 20:32 ` Pavel Machek
2011-03-04 21:52 ` Vasiliy Kulikov
2011-03-04 20:42 ` Rafael J. Wysocki
2011-03-04 21:10 ` Vasiliy Kulikov
2011-03-04 21:21 ` Rafael J. Wysocki
2011-03-04 21:46 ` Vasiliy Kulikov
2011-03-04 22:30 ` Rafael J. Wysocki
2011-03-04 22:42 ` Pavel Machek
2011-03-05 10:34 ` Vasiliy Kulikov
2011-03-05 11:24 ` Rafael J. Wysocki
2011-03-08 6:58 ` Pavel Machek
2011-03-04 21:27 ` [Security] " Greg KH
2011-03-04 21:51 ` Vasiliy Kulikov [this message]
2011-03-06 19:36 ` david
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