linux-kernel - Re: [tpmdd-devel] [PATCH v8 2/2] tpm: add securityfs support for TPM 2.0 firmware event log

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Date:   Fri, 13 Jan 2017 13:09:29 -0500
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     Nayna Jain <nayna@...ux.vnet.ibm.com>,
        tpmdd-devel@...ts.sourceforge.net
Cc:     linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH v8 2/2] tpm: add securityfs support for TPM
 2.0 firmware event log

On 01/11/2017 02:54 AM, Nayna Jain wrote:
> Unlike the device driver support for TPM 1.2, the TPM 2.0 does
> not support the securityfs pseudo files for displaying the
> firmware event log.
>
> This patch enables support for providing the TPM 2.0 event log in
> binary form. TPM 2.0 event log supports a crypto agile format that
> records multiple digests, which is different from TPM 1.2. This
> patch enables the tpm_bios_log_setup for TPM 2.0  and adds the
> event log parser which understand the TPM 2.0 crypto agile format.
>
> Signed-off-by: Nayna Jain <nayna@...ux.vnet.ibm.com>
> ---
>   drivers/char/tpm/Makefile                          |   2 +-
>   .../char/tpm/{tpm_eventlog.c => tpm1_eventlog.c}   |  35 ++--
>   drivers/char/tpm/tpm2_eventlog.c                   | 203 +++++++++++++++++++++
>   drivers/char/tpm/tpm_acpi.c                        |   3 +
>   drivers/char/tpm/tpm_eventlog.h                    |  63 +++++++
>   5 files changed, 291 insertions(+), 15 deletions(-)
>   rename drivers/char/tpm/{tpm_eventlog.c => tpm1_eventlog.c} (95%)
>   create mode 100644 drivers/char/tpm/tpm2_eventlog.c
>
>
> diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c
> index b7718c9..169edf3 100644
> --- a/drivers/char/tpm/tpm_acpi.c
> +++ b/drivers/char/tpm/tpm_acpi.c
> @@ -54,6 +54,9 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
>   	u64 len, start;
>   	struct tpm_bios_log *log;
>
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		return -ENODEV;
> +


Works with SeaBIOS when this check is disabled.


    Stefan