linux-kernel - Re: [RFC v4][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel support

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Message-ID: <20090619201159.35d259bb@lxorguk.ukuu.org.uk>
Date:	Fri, 19 Jun 2009 20:11:59 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Valdis.Kletnieks@...edu
Cc:	Pavel Machek <pavel@....cz>, James Morris <jmorris@...ei.org>,
	Joseph Cihula <joseph.cihula@...el.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, hpa@...or.com, andi@...stfloor.org,
	Chris Wright <chrisw@...s-sol.org>, jbeulich@...ell.com,
	peterm@...hat.com, gang.wei@...el.com, shane.wang@...el.com
Subject: Re: [RFC v4][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel
 support

> "Somebody has screwed with this kernel image, and you're not booting what you
> thought you were booting."

So I screw with your user space - you can't measure enough to make it
save you in a general setup. Too much I can hit changes each boot.

For a tiny number of very special cases that are highly controlled it has
potential uses. Some of those are evil some are ones with meaningful uses
(eg ATM machines) - although attacks there have included hardware attacks
outside the PC components too.

Personally (and I'm sure Intel disagrees with me) my bigger work is that
I can't verify that the magic block of code for tboot is correct.

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