linux-kernel - Re: [RFC][PATCH 0a/3] TXT: Intel(R) Trusted Execution Technology support for Linux

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Message-ID: <20081009175938.GA12507@elf.ucw.cz>
Date:	Thu, 9 Oct 2008 19:59:38 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	"Cihula, Joseph" <joseph.cihula@...el.com>,
	linux-kernel@...r.kernel.org, "Wang, Shane" <shane.wang@...el.com>,
	"Wei, Gang" <gang.wei@...el.com>,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	Chris Wright <chrisw@...hat.com>,
	Jan Beulich <jbeulich@...ell.com>, mingo@...e.hu, tytso@....edu
Subject: Re: [RFC][PATCH 0a/3] TXT: Intel(R) Trusted Execution Technology
	support for Linux - Overview

On Thu 2008-10-09 10:44:27, Chris Wright wrote:
> * Pavel Machek (pavel@...e.cz) wrote:
> > Ok, I don't get it, why would I want to measure my kernel?
> 
> Trusted boot.  There's always the double-edge sword w/ this.  Clearly,
> a requirement is that you don't just brick your own box, and have some
> policy/mechanism for defining how you'd use trusted boot.  I believe
> that's all there w/ TXT patch (since it's mostly handled before kernel
> boots, TXT kernel bit is just to help w/ handoff).

I have never used trusted boot and I'm not sure I want to. Why would I
want to do that?

> > I see why Disney would want to do that, but I don't see why we would
> > want to help them.
> > 
> > Plus, the fact that trusted mode is pretty much incompatible with
> > s3/s4 makes it useless, right?
> 
> Why do you say that?  Did you look at patch 3/3, see tboot_sleep().

You exit/reenter the trusted mode accross sleep... so any guarantees
"trusted" mode does are void, right?
								Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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