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Date:	Thu, 4 Sep 2008 15:06:09 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...x.de,
	hpa@...or.org, Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch] Add basic sanity checks to the syscall execution patch

On Thu, Sep 04, 2008 at 01:34:19PM +0100, Alan Cox wrote:
> On Thu, 04 Sep 2008 14:01:46 +0200
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > Arjan van de Ven <arjan@...radead.org> writes:
> > 
> > > Add basic sanity checks to the syscall execution patch
> > 
> > This just means that the root kits will switch to patch
> > the first instruction of the entry points instead.
> > 
> > So the protection will be zero to minimal, but the overhead will
> > be there forever.
> 
> Agreed entirely. This is a waste of time and a game not worth playing.
> The only place you can expect to make a difference here is in virtualised

Even that can be circumvented by patching indirect pointers (or pointer 
to objects with indirect pointers) in any writable object. Or in
a couple of other ways.

But yes it would still seem like a reasonable useful improvement.

-Andi

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