linux-kernel - Re: [tpmdd-devel] [PATCH v6 2/2] tpm: enhance TPM 2.0 PCR extend to, support multiple banks

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Message-Id: <588F0EF1.1090300@linux.vnet.ibm.com>
Date:   Mon, 30 Jan 2017 15:31:21 +0530
From:   Nayna <nayna@...ux.vnet.ibm.com>
To:     Ken Goldman <kgold@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        tpmdd-devel@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH v6 2/2] tpm: enhance TPM 2.0 PCR extend to,
 support multiple banks



On 01/26/2017 03:41 AM, Ken Goldman wrote:
>> The current TPM 2.0 device driver extends only the SHA1 PCR bank
>> but the TCG Specification[1] recommends extending all active PCR
>> banks, to prevent malicious users from setting unused PCR banks with
>> fake measurements and quoting them.
>>
>> The existing in-kernel interface(tpm_pcr_extend()) expects only a
>> SHA1 digest.  To extend all active PCR banks with differing
>> digest sizes, the SHA1 digest is padded with trailing 0's as needed.
>>
>> This patch reuses the defined digest sizes from the crypto subsystem,
>> adding a dependency on CRYPTO_HASH_INFO module.
>>
>> [1] TPM 2.0 Specification referred here is "TCG PC Client Specific
>> Platform Firmware Profile for TPM 2.0"
>
> Tested-by: Kenneth Goldman <kgold@...ux.vnet.ibm.com>
>
> I obtained an IMA event log from a Power platform, along with the PCR 10
> value from both the SHA-1 and SHA-256 banks of its Nuvoton TPM 2.0.  I
> independently validated that the event log matches the TPM PCR values.

Thank You Ken !!

Thanks & Regards,
    - Nayna

>
>
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