linux-kernel - Re: [RFC PATCH] tpm: only set efi_tpm_final_log

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Message-ID: <20190923171010.csz4js3xs2mixmpq@cantor>
Date:   Mon, 23 Sep 2019 10:10:10 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     linux-efi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        Matthew Garrett <mjg59@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Subject: Re: [RFC PATCH] tpm: only set efi_tpm_final_log_size after
 successful event log parsing

Any thoughts on this? I know of at least 2 Lenovo models that are
running into this problem.

In the case of the one I have currently have access to the problem is
that the hash algorithm id for an event isn't one that is currently in
the TCG registry, and it fails to find a match when walking the
digest_sizes array. That seems like an issue for the vendor to fix in the bios,
but we should look at the return value of tpm2_calc_event_log_size and not
stick a negative value in efi_tpm_final_log_size.