diff options
author | Vadim Bendebury <vbendeb@chromium.org> | 2016-07-03 22:20:17 -0700 |
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committer | Martin Roth <martinroth@google.com> | 2016-07-14 00:00:30 +0200 |
commit | f5ef699f40ca36815069e9c1df72af6385e600f0 (patch) | |
tree | 7cbc40acafedef812c0d04d611ccaeb625fc454c /util/genbuild_h | |
parent | 4c0851cc37f42ed88d62b876357b71cfdaac480f (diff) |
tpm2: implement and use pcr_extend command
TPM PCRs are used in Chrome OS for two purposes: to communicate
crucial information from RO firmware and to protect FW and kernel
rollback counters from being deleted.
As implemented in a TPM1 compatible way, the PCR extension command
requires a prebuilt digest to calculate a new PCR value.
TPM2 specification introduces a PCR_Event command, where the TPM
itself calculates the digest of an arbitrary length string, and then
uses the calculated digest for PCR extension. PCR_Event could be a
better option for Chrome OS, this needs to be investigated separately.
BRANCH=none
BUG=chrome-os-partner:50645
TEST=verified that the two PCRs are successfully extended before the
RW firmware is called.
Change-Id: I38fc88172de8ec8bef56fec026f83058480c8010
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: 73388139db3ffaf61a3d9027522c5ebecb3ad051
Original-Change-Id: I1a9bab7396fdb652e2e3bc8529b828ea3423d851
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/358098
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Reviewed-on: https://review.coreboot.org/15639
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>
Diffstat (limited to 'util/genbuild_h')
0 files changed, 0 insertions, 0 deletions