linux-kernel - Re: [PATCH v5 3/3] tpm: add securityfs support for TPM 2.0 firmware event log

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Message-ID: <20161125194317.GG16504@obsidianresearch.com>
Date:   Fri, 25 Nov 2016 12:43:17 -0700
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Nayna Jain <nayna@...ux.vnet.ibm.com>,
        tpmdd-devel@...ts.sourceforge.net, peterhuewe@....de,
        tpmdd@...horst.net, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] tpm: add securityfs support for TPM 2.0 firmware
 event log

On Thu, Nov 24, 2016 at 11:10:57PM +0200, Jarkko Sakkinen wrote:
> On Wed, Nov 23, 2016 at 12:27:37PM -0500, 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>
> 
> I don't want to say much about this before I've tested it. I wonder
> what cheap hardware I could use to test this. Any advice is on this
> from anyone is much appreciated.

If you found a small ARM system with TPM you could customize the uboot
to build an event log and pass it in via DT.

Not sure how much work that would be, does uboot have tpm code
already?

Jason