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Date:	Tue, 27 Oct 2009 11:59:06 -0400
From:	David Safford <safford@...son.ibm.com>
To:	Eric Paris <eparis@...isplace.org>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Jean-Christophe Dubois <jcd@...budubois.net>,
	Mimi Zohar <zohar@...ibm.com>,
	Stable Kernel <stable@...nel.org>
Subject: Re: [PATCH] ima: remove ACPI dependency

On Tue, 2009-10-27 at 09:58 -0400, Eric Paris wrote:
> On Mon, Oct 26, 2009 at 9:26 AM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> > Remove ACPI dependency on systems without a TPM enabled.
> 
> I'm confused why you need ACPI at all.  The TPM code doesn't require
> ACPI (I wish it did but Alan Cox Nak'd that patch).  I don't see acpi
> anywhere in the ima code.  What's the problem we are solving?  Why
> does IMA care about ACPI at all?  And aren't you really just dropping
> the build requirement on TCG_TPM?  Is that a great idea?
> 
> -Eric

This is discussed in the LSM thread:
http://marc.info/?l=linux-security-module&m=125322062401677&w=2

Basically, if running on a system with a TPM, IMA wants the TPM
boot measurement log, which the TPM driver can only get through
ACPI. If the platform does not have a TPM, then IMA does not 
need ACPI. 

dave
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