linux-kernel - Re: Problems with TPM timeouts

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Message-ID: <a9b94fad8f0d8023ce2459fa11494ff8e83d0b65.camel@HansenPartnership.com>
Date: Wed, 02 Oct 2024 10:31:34 -0700
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Jonathan McDowell <noodles@...th.li>, linux-integrity@...r.kernel.org, 
	Jarkko Sakkinen <jarkko@...nel.org>
Cc: Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>, 
	linux-kernel@...r.kernel.org
Subject: Re: Problems with TPM timeouts

On Wed, 2024-10-02 at 18:03 +0100, Jonathan McDowell wrote:
[...]
> First, I've seen James' post extending the TPM timeouts back in 2018
> (
> https://lore.kernel.org/linux-integrity/1531329074.3260.9.camel@Hansen
> Partnership.com/), which doesn't seem to have been picked up. Was an
> alternative resolution found, or are you still using this, James?

No, because I've got a newer laptop.  The problem was seen on a 2015
XPS-13 with a Nuvoton TPM that was software upgraded to 2.0 (and had
several other problems because of this).  I assumed, based on the lack
of reports from others, that this was a problem specific to my TPM and
so didn't push it.

The annoying thing for me was that the TPM didn't seem to recover. 
Once it started giving timeouts it carried on timing out until machine
reset, which really caused problems because all my keys are TPM
resident.

Is yours a permanent problem like mine, or is it transient (TPM
recovers and comes back)?

Regards,

James