Thread (15 messages) 15 messages, 4 authors, 2018-04-08

[PATCH 0/5 V2] tpm: timeouts revamp

From: Winkler, Tomas <hidden>
Date: 2018-03-06 15:05:53
Also in: linux-integrity, lkml

 
On Tue, Mar 06, 2018 at 01:39:49PM +0100, Javier Martinez Canillas wrote:
quoted
On 03/06/2018 01:17 PM, Jarkko Sakkinen wrote:
quoted
On Tue, 2018-03-06 at 11:24 +0200, Tomas Winkler wrote:
quoted
This series cleans up tpm timeouts setting and handling.

First motivation was to fix failures coming from too short timeouts
for commands that creates keys.
Key generation may take significant time depending on the
underlying hardware. Rather than increasing default timeout a new
constant is added, to not stall too long on regular commands failures.

Second is to define timeouts for new tpm2 commands defined in TCG
1.36 spec.
Probably a typo, since the latest TCG spec version is the 1.38 [0].
quoted
Where can we get that specification? I don't have that new version
and couldn't find it from the public internet.

/Jarkko
[0]: https://trustedcomputinggroup.org/tpm-library-specification/
I already have that version of the specifications but I thought that we were
speaking about PC Client Platform spefication, which is at version 1.30. TCG
spec is an ambiguous term so that is where the confusion started from.
TCG spec doesn't define timeouts just new commands 
The only spec I've seen some timeouts is the PC Client Specification but I
guess I've then missed the list in TPM 2.0 spefication. Where are they listed?
I worked with Will Arthur durations based on PC Client Specification when
TPM 2.0 support was first implemented.

That's correct, this  PTP spec. It defines the timeouts for the commands, this is stated in the patch comments.

Need to cross reference these two specs. 

Thanks
Tomas

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