linux-kernel - Re: [patch] Add basic sanity checks to the syscall execution patch

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Date:	Fri, 5 Sep 2008 22:48:30 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	pageexec@...email.hu
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, tglx@...x.de, hpa@...or.com
Subject: Re: [patch] Add basic sanity checks to the syscall execution patch

On Fri, Sep 05, 2008 at 09:42:48PM +0200, pageexec@...email.hu wrote:
> On 5 Sep 2008 at 19:26, Andi Kleen wrote:
> 
> > 
> > First such checkers already exist -- they are called root kit checkers.
> > There are various around. 
> > Usually operate from user space. You could run them in a cron job.
> 
> how trivial do you think it is for *kernel* code to evade *userland*
> checking it? ;) otherwise agreed with rest.

It depends on where the userland runs. e.g. if it's under a hypervisor
and in a separate domain it should be reasonably safe.

And then I don't think it is much difference between Ingo's kernel
checker and a user land checker. Both can be disabled it you know
about them.

-Andi

-- 
ak@...ux.intel.com
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