linux-kernel - Re: [PATCH v2 0/3] Call GetEventLog before ExitBootServices

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Date:   Wed, 13 Sep 2017 11:59:30 -0700
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Thiebaud Weksteen <tweek@...gle.com>
Cc:     linux-efi@...r.kernel.org, ard.biesheuvel@...aro.org,
        matt@...eblueprint.co.uk, linux-kernel@...r.kernel.org,
        mjg59@...gle.com, tpmdd-devel@...ts.sourceforge.net,
        peterhuewe@....de, jgunthorpe@...idianresearch.com,
        tpmdd@...horst.net
Subject: Re: [PATCH v2 0/3] Call GetEventLog before ExitBootServices

On Mon, Sep 11, 2017 at 12:00:19PM +0200, Thiebaud Weksteen wrote:
> With TPM 1.2, the ACPI table ("TCPA") has two fields to recover the Event Log
> Area (LAML and LASA). These logs are useful to understand and rebuild the
> final values of PCRs.
> 
> With TPM 2.0, the ACPI table ("TPM2") does not contain these fields anymore.
> The recommended method is now to call the GetEventLog EFI protocol before
> ExitBootServices.
> 
> Implement this method within the EFI stub and create copy of the logs for the
> TPM device. This will create /sys/kernel/security/tpm0/binary_bios_measurements
> for TPM 2.0 devices (similarly to the current behaviour for TPM 1.2 devices).
> 
> -------------------------------------------------------------------------------
> 
> Patchset Changelog:
> 
> Version 2:
> - Move tpm_eventlog.h to top include directory, add commit for this.
> - Use EFI_LOADER_DATA to store the configuration table
> - Whitespace and new lines fixes
> 
> 
> Thiebaud Weksteen (3):
>   tpm: move tpm_eventlog.h outside of drivers folder
>   efi: call get_event_log before ExitBootServices
>   tpm: parse TPM event logs based on EFI table
> 
>  arch/x86/boot/compressed/eboot.c                   |  1 +
>  drivers/char/tpm/Makefile                          |  2 +-
>  drivers/char/tpm/tpm-chip.c                        |  3 +-
>  drivers/char/tpm/tpm-interface.c                   |  2 +-
>  drivers/char/tpm/tpm.h                             | 35 ++++++++--
>  drivers/char/tpm/tpm1_eventlog.c                   | 17 +++--
>  drivers/char/tpm/tpm2_eventlog.c                   |  2 +-
>  drivers/char/tpm/tpm_acpi.c                        |  2 +-
>  drivers/char/tpm/tpm_efi.c                         | 66 ++++++++++++++++++
>  drivers/char/tpm/tpm_of.c                          |  2 +-

I think these filenames are just awful. Now that you are introducing
completely a new file, it would make sense rename these as

* tpm_eventlog_acpi.c
* tpm_eventlog_efi.c
* tpm_eventlog_of.c

Please wait for further review comments before sending a refined patch
set. Please have renames for tpm_acpi.c and tpm_of.c in its own commit
before introducing other changes.

/Jarkko