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Date:   Fri, 4 Nov 2022 11:34:31 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Evan Green <evgreen@chromium.org>
Cc:     linux-kernel@vger.kernel.org, corbet@lwn.net,
        linux-pm@vger.kernel.org, rjw@rjwysocki.net, gwendal@chromium.org,
        apronin@chromium.org, Pavel Machek <pavel@ucw.cz>,
        Matthew Garrett <mgarrett@aurora.tech>,
        linux-integrity@vger.kernel.org, jejb@linux.ibm.com,
        zohar@linux.ibm.com, dlunev@google.com,
        Eric Biggers <ebiggers@kernel.org>,
        Ben Boeckel <me@benboeckel.net>, jarkko@kernel.org,
        Matthew Garrett <matthewgarrett@google.com>,
        Matthew Garrett <mjg59@google.com>,
        Ben Boeckel <linux@me.benboeckel.net>,
        David Howells <dhowells@redhat.com>,
        James Morris <jmorris@namei.org>,
        Paul Moore <paul@paul-moore.com>,
        "Serge E. Hallyn" <serge@hallyn.com>, keyrings@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-security-module@vger.kernel.org
Subject: Re: [PATCH v4 05/11] security: keys: trusted: Allow storage of PCR
 values in creation data
Message-ID: <202211041134.927C258@keescook>
References: <20221103180120.752659-1-evgreen@chromium.org>
 <20221103105558.v4.5.I32591db064b6cdc91850d777f363c9d05c985b39@changeid>
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On Thu, Nov 03, 2022 at 11:01:13AM -0700, Evan Green wrote:
> From: Matthew Garrett <matthewgarrett@google.com>
> 
> When TPMs generate keys, they can also generate some information
> describing the state of the PCRs at creation time. This data can then
> later be certified by the TPM, allowing verification of the PCR values.
> This allows us to determine the state of the system at the time a key
> was generated. Add an additional argument to the trusted key creation
> options, allowing the user to provide the set of PCRs that should have
> their values incorporated into the creation data.
> 
> Link: https://lore.kernel.org/lkml/20210220013255.1083202-6-matthewgarrett@google.com/
> Signed-off-by: Matthew Garrett <mjg59@google.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook