|author||Andrey Pronin <email@example.com>||Thu Sep 19 09:27:23 2019 -0700|
|committer||Julius Werner <firstname.lastname@example.org>||Sat Sep 21 01:13:54 2019 +0000|
vboot: extend BOOT_MODE_PCR to SHA256 bank on TPM2 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 <email@example.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35476 Reviewed-by: Julius Werner <firstname.lastname@example.org> Tested-by: build bot (Jenkins) <email@example.com>
coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload.
With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required.
coreboot was formerly known as LinuxBIOS.
After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot.
See https://www.coreboot.org/Payloads for a list of supported payloads.
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
ANY_TOOLCHAINKconfig option if you're feeling lucky (no support in this case).
Please consult https://www.coreboot.org/Build_HOWTO for details.
If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU.
Please see https://www.coreboot.org/QEMU for details.
Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:
You can contact us directly on the coreboot mailing list:
The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details.
coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details.
This makes the resulting coreboot images licensed under the GPL, version 2.