Subject: Re: [PATCH v1.2 3/4] keys: add new trusted key-type
From: David Safford <safford@watson.ibm.com>
To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org,
        linux-security-module@vger.kernel.org, keyrings@linux-nfs.org,
        linux-crypto@vger.kernel.org, David Howells <dhowells@redhat.com>,
        James Morris <jmorris@namei.org>,
        Rajiv Andrade <srajiv@linux.vnet.ibm.com>,
        Mimi Zohar <zohar@us.ibm.com>
In-Reply-To: <20101108170937.GA31501@obsidianresearch.com>
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	 <1289230246-3856-4-git-send-email-zohar@linux.vnet.ibm.com>
	 <20101108170937.GA31501@obsidianresearch.com>
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Date: Mon, 08 Nov 2010 13:18:33 -0500
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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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