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:   Tue, 1 Oct 2019 23:53:31 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexey Klimov <aklimov@...hat.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 Sat, Sep 28, 2019 at 10:45:43AM -0700, Jerry Snitselaar wrote:
> 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?

Thanks for reminding. I'll put this to my master soonish.

/Jarkko