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TPM support within Grub2

From: Daniel P. Smith
Subject: TPM support within Grub2
Date: Sun, 1 Jul 2018 19:09:30 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0


I have a measured boot implementation I have been working on that
introduces a DRTM relocator that I would like to eventually upstream.
This work does rely on the ability to access a TPM 1.2 chip from within
Grub2. I am aware of Matthew Garrett's pending patch to add core TPM
support[1] but that is limited to UEFI environments. My target
environment uses Coreboot with the TCG BIOS payload to launch the
environment. For TPM support I am using code picked out of the
TrustedGRUB2 fork[2]. As a precursor to upstreaming my DRTM relocator, I
would like to see if I could find a way to generically introduce TPM
support into Grub2 that support's Matthew's UEFI backend, TrustedGrub2's
TPM 1.2 raw I/O, as well as leave a path for TPM2 raw I/O. In both
implementations TPM support is include as an x86 device when in fact
they can also be found in ARM devices, which is on my wish list of
future devices I would like to support. With all of this in mind, I
wanted to open a discussion on the best way to implement generic TPM
support. In Matthew's approach TPM is implemented under
grub-core/commands while TrustedGRUB2 is split between grub-core/kern
and grub-core/tpm. IMHO TPM functionality should be divided into HW
interfaces, TPM command processing, and higher order TPM operations. If
the logic was segmented in this manner, what are other's opinions on
where segments of logic should reside within the Grub2 source tree?


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