Re: [PATCH v5 6/7] tpm: ensure that the output of PCR read contains the correct digest size

On 11/16/2018 2:41 PM, Jarkko Sakkinen wrote:

On Wed, Nov 14, 2018 at 04:31:07PM +0100, Roberto Sassu wrote:

...

This patch protects against data corruption that could happen in the bus, by checking that that the digest size returned by the TPM during a PCR read matches the size of the algorithm passed to tpm2_pcr_read().

This check is performed after information about the PCR banks has been retrieved.

Signed-off-by: Roberto Sassu roberto.sassu@huawei.com Reviewed-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Cc: stable@vger.kernel.org

Missing fixes tag.

Before this patch set, tpm2_pcr_extend() always copied 20 bytes from the output sent by the TPM.

Roberto

/Jarkko