linux-kernel - Re: [PATCH v4 0/4] tpm: add update_durations class op to allow override of chip supplied values

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Date:   Sat, 28 Sep 2019 10:45:43 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Alexey Klimov <aklimov@...hat.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH v4 0/4] tpm: add update_durations class op to allow
 override of chip supplied values

On Mon Sep 02 19, Jerry Snitselaar wrote:
>We've run into a case where a customer has an STM TPM 1.2 chip
>(version 1.2.8.28), that is getting into an inconsistent state and
>they end up getting tpm transmit errors.  In really old tpm code this
>wasn't seen because the code that grabbed the duration values from the
>chip could fail silently, and would proceed to just use default values
>and move forward. More recent code though successfully gets the
>duration values from the chip, and using those values this particular
>chip version gets into the state seen by the customer.
>
>The idea with this patchset is to provide a facility like the
>update_timeouts operation to allow the override of chip supplied
>values.
>
>changes from v3:
>    * Assign value to version when tpm1_getcap is successful for TPM 1.1 device
>      not when it fails.
>
>changes from v2:
>    * Added patch 1/3
>    * Rework tpm_tis_update_durations to make use of new version structs
>      and pull tpm1_getcap calls out of loop.
>
>changes from v1:
>    * Remove unneeded newline
>    * Formatting cleanups
>    * Change tpm_tis_update_durations to be a void function, and
>      use chip->duration_adjusted to track whether adjustment was
>      made.
>
>Jarkko Sakkinen (1):
>      tpm: Remove duplicate code from caps_show() in tpm-sysfs.c
>
>Jerry Snitselaar (2):
>      tpm: provide a way to override the chip returned durations
>      tpm_tis: override durations for STM tpm with firmware 1.2.8.28
>
>

Anyone else have any feedback on this patchset?