linux-kernel - Re: [PATCH v4 08/11] PM: hibernate: Use TPM-backed keys to encrypt image

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Date:   Fri, 4 Nov 2022 11:41:49 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Evan Green <evgreen@...omium.org>
Cc:     linux-kernel@...r.kernel.org, corbet@....net,
        linux-pm@...r.kernel.org, rjw@...ysocki.net, gwendal@...omium.org,
        apronin@...omium.org, Pavel Machek <pavel@....cz>,
        Matthew Garrett <mgarrett@...ora.tech>,
        linux-integrity@...r.kernel.org, jejb@...ux.ibm.com,
        zohar@...ux.ibm.com, dlunev@...gle.com,
        Eric Biggers <ebiggers@...nel.org>,
        Ben Boeckel <me@...boeckel.net>, jarkko@...nel.org,
        Len Brown <len.brown@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v4 08/11] PM: hibernate: Use TPM-backed keys to encrypt
 image

On Thu, Nov 03, 2022 at 11:01:16AM -0700, Evan Green wrote:
> When using encrypted hibernate images, have the TPM create a key for us
> and seal it. By handing back a sealed blob instead of the raw key, we
> prevent usermode from being able to decrypt and tamper with the
> hibernate image on a different machine.
> 
> We'll also go through the motions of having PCR23 set to a known value at
> the time of key creation and unsealing. Currently there's nothing that
> enforces the contents of PCR23 as a condition to unseal the key blob,
> that will come in a later change.
> 
> Sourced-from: Matthew Garrett <mjg59@...gle.com>

I'd say Suggested-by. "Source-from:" is not a tag that has ever been
used before. :)

Otherwise, looks good.

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

-- 
Kees Cook