linux-kernel - Re: [PATCH 5/9] security: keys: trusted: Allow storage of PCR values in creation data

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Message-ID: <YDK4HYZjHUdZ3GkL@erythro>
Date:   Sun, 21 Feb 2021 14:44:29 -0500
From:   Ben Boeckel <me@...boeckel.net>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     Matthew Garrett <matthewgarrett@...gle.com>,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-pm@...r.kernel.org, keyrings@...r.kernel.org,
        zohar@...ux.ibm.com, jejb@...ux.ibm.com, corbet@....net,
        rjw@...ysocki.net, Matthew Garrett <mjg59@...gle.com>
Subject: Re: [PATCH 5/9] security: keys: trusted: Allow storage of PCR values
 in creation data

On Sat, Feb 20, 2021 at 05:09:07 +0200, Jarkko Sakkinen wrote:
> Something popped into mind: could we make PCR 23 reservation dynamic
> instead of a config option.
> 
> E.g. if the user space uses it, then it's dirty and hibernate will
> fail. I really dislike the static compilation time firewall on it.

I don't know the threat model here, but couldn't hibernation then be
blocked by userspace using PCR 23 in some way (thus becoming a Denial of
Service)? Are elevated permissions required to use PCR values?

--Ben