linux-kernel - Re: [PATCH v1.2 3/4] keys: add new trusted key-type

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Date:	Mon, 08 Nov 2010 13:18:33 -0500
From:	David Safford <safford@...son.ibm.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org,
	linux-crypto@...r.kernel.org, David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH v1.2 3/4] keys: add new trusted key-type

On Mon, 2010-11-08 at 10:09 -0700, Jason Gunthorpe wrote:
> On Mon, Nov 08, 2010 at 10:30:45AM -0500, Mimi Zohar wrote:
> 
> > pcrlock=n    extends the designated PCR 'n' with a random value,
> >              so that a key sealed to that PCR may not be unsealed
> >              again until after a reboot.
> 
> Nice, but this seems very strange to me, since it has nothing to do
> with the key and could be done easially in userspace?
> 
> Jason

This is strictly for convenience in initramfs, so that the trusted
key can be loaded and locked in a single command, with no need for
an additional application to extend a PCR. As the the TPM driver 
already has support for extend, it's a trivial addition.

dave
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