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With the support of various algorithms and banks in tlcl_extend(),
digest_algo parameter of tpm_extend_pcr() started defining the target
PCR bank in TPM2 case.
The OS expects coreboot to extend the SHA256 bank of BOOT_MODE_PCR.
The value that the OS expects coreboot to extend into BOOT_MODE_PCR
is the SHA1 digest of mode bits extended to the length of SHA256 digest
by appending zero bytes.
Thus the correct value for digest_algo passed into tpm_extend_pcr() for
BOOT_MODE_PCR is TPM_ALG_SHA256.
This didn't matter until adding the support for multiple digest introduced
by patches like https://review.coreboot.org/c/coreboot/+/33252, as
tlcl_extend always used SHA256 bank before.
Change-Id: I834fec24023cd10344cc359117f00fc80c61b80c
Signed-off-by: Andrey Pronin <apronin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35476
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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To make explicit when vboot2 error codes should be returned,
use the new vb2_error_t type on all functions which return
VB2_ERROR_* constants.
Additionally, add required vboot submodule commit id e6700f4c:
2019-07-31 14:12:30 +0800 - (vboot: update vboot2 functions to use new vb2_error_t)
NOTE: This patch was merged separately on the Chromium tree:
https://chromium-review.googlesource.com/c/1728499
BUG=b:124141368, chromium:988410
TEST=make clean && make test-abuild
BRANCH=none
Change-Id: I804c2b407e496d0c8eb9833be629b7c40118415c
Signed-off-by: Joel Kitching <kitching@google.com>
Cq-Depend: chromium:1728292
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34860
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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Add support for Intel PTT. For supporting Intel PTT we need to disable
read and write access to the TPM NVRAM during the bootblock. TPM NVRAM
will only be available once the DRAM is initialized. To circumvent this,
we mock secdata if HAVE_INTEL_PTT is set. The underlying problem is,
that the iTPM only supports a stripped down instruction set while the
Intel ME is not fully booted up. Details can be found in Intel document
number 571993 - Paragraph 2.10.
Change-Id: I08c9a839f53f96506be5fb68f7c1ed5bf6692505
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34510
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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