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