[PATCH v6 4/7] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm

Roberto Sassu roberto.sassu at huawei.com
Fri Dec 7 14:51:33 UTC 2018

On 12/6/2018 8:49 PM, Mimi Zohar wrote:
> On Wed, 2018-12-05 at 15:31 -0500, Mimi Zohar wrote:
>> On Tue, 2018-12-04 at 15:40 -0800, Jarkko Sakkinen wrote:
>>> On Tue, Dec 04, 2018 at 09:21:35AM +0100, Roberto Sassu wrote:
>>>> Currently the TPM driver allows other kernel subsystems to read only the
>>>> SHA1 PCR bank. This patch modifies the parameters of tpm_pcr_read() and
>>>> tpm2_pcr_read() to pass a tpm_digest structure, which contains the desired
>>>> hash algorithm. Also, since commit 125a22105410 ("tpm: React correctly to
>>>> RC_TESTING from TPM 2.0 self tests") removed the call to tpm2_pcr_read(),
>>>> the new parameter is expected to be always not NULL.
>>>> Due to the API change, IMA functions have been modified.
>>>> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
>>>> Acked-by: Mimi Zohar <zohar at linux.ibm.com>
>>> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
>>> Mimi, Nayna, can you help with testing this (because of the IMA change)?
>> It's up & running and the measurement list verifies against the TPM
>> PCR.  Although this system has two algorithms enabled, all of the PCRs
>> are allocated for one algorithm and none for the other.  I'm still
>> looking around for another system with PCR 10 enabled for multiple
>> algorithms.
> PCRs for sha1 and sha256 algorithms are being updated and the
> measurement list verifies against the SHA1 PCR-10.
> Roberto, have you added support in ima-evm-utils to validate the other
> banks?

I modified IMA LTP.


> Mimi

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