linux-kernel - Re: [PATCH v2] tpm/eventlog: Don't abort tpm_read

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Message-ID: <YzyyZ6AFAgTRG5G5@kernel.org>
Date:   Wed, 5 Oct 2022 01:23:35 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Erkki Eilonen <erkki@...rmetal.eu>
Cc:     jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, morten@...derud.pw, peterhuewe@....de
Subject: Re: [PATCH v2] tpm/eventlog: Don't abort tpm_read_log on faulty ACPI
 address

On Sun, Oct 02, 2022 at 12:52:24AM +0300, Erkki Eilonen wrote:
> > If this is not something you can buy off-the-shelf, it
> > unfortunately does not cut.
> 
> For a N=2, we're having the same issue with a set of OTC machines.
> 
> Device: QuantaGrid D53X-1U
> BIOS:
>   Vendor: INSYDE Corp.
>   Version: 3A16.Q402
>   Release_Date: 11/10/2021
> 
> ACPI TPM2 table:
>   [000h 0000   4]                    Signature : "TPM2"    [Trusted Platform Module hardware interface table]
>   [004h 0004   4]                 Table Length : 0000004C
>   [008h 0008   1]                     Revision : 04
>   [009h 0009   1]                     Checksum : 8C
>   [00Ah 0010   6]                       Oem ID : "INSYDE"
>   [010h 0016   8]                 Oem Table ID : "WHITLEY "
>   [018h 0024   4]                 Oem Revision : 00000002
>   [01Ch 0028   4]              Asl Compiler ID : "INTL"
>   [020h 0032   4]        Asl Compiler Revision : 00040000
>   
>   [024h 0036   2]               Platform Class : 0001
>   [026h 0038   2]                     Reserved : 0000
>   [028h 0040   8]              Control Address : 0000000000000000
>   [030h 0048   4]                 Start Method : 06 [Memory Mapped I/O]
>   
>   [034h 0052  12]            Method Parameters : 00 00 00 00 00 00 00 00 00 00 00 00
>   [040h 0064   4]           Minimum Log Length : 00010000
>   [044h 0068   8]                  Log Address : 0000000043274000
> 
> Fallback to the UEFI eventlog is what we did for a short term fix too. Will try to contact the vendor for a fixed ACPI table long term.
> 
> Morten: Did you get in contact with the vendor about this? Looks like a class error across different devices.
> 
> Cheers,
> Erkki

Does the bug fix work for you? If you can give tested-by for it, then that
ofc changes everything.

BR, Jarkko