[PATCH v7 0/6] tpm: Support boot measurements

Eddie James
2023-03-01T22:51:12Z

This series adds support for measuring the boot images more generically
than the existing EFI support. Several EFI functions have been moved to
the TPM layer. The series includes optional measurement from the bootm
command.
A new test case has been added for the bootm measurement to test the new
path, and the sandbox TPM2 driver has been updated to support this use
case.
This series is based on Ilias' auto-startup series and Simon's additions.

Changes since v6:
- Added comment for bootm_measure
- Fixed line length in bootm_measure
- Added Linaro copyright for all the EFI moved code
- Changed tcg2_init_log (and by extension, tcg2_measurement_init) to
copy any discovered event log to the user's log if passed in.

Changes since v5:
- Re-ordered the patches to put the sandbox TPM driver patch second
- Remove unused platform_get_eventlog in efi_tcg2.c
- First look for tpm_event_log_* properties instead of linux,sml-*
- Fix efi_tcg2.c compilation
- Select SHA* configs
- Remove the !SANDBOX dependency for EFI TCG2
- Only compile in the measurement u-boot command when CONFIG_MEASURED_BOOT
is enabled

Changes since v4:
- Remove tcg2_measure_event function and check for NULL data in
tcg2_measure_data
- Use tpm_auto_startup
- Fix efi_tcg2.c compilation for removing tcg2_pcr_read function
- Change PCR indexes for initrd and dtb
- Drop u8 casting in measurement test
- Use bullets in documentation

Changes since v3:
- Reordered headers
- Refactored more of EFI code into common code
Removed digest_info structure and instead used the common alg_to_mask
and alg_to_len
Improved event log parsing in common code to get it equivalent to EFI
Common code now extends PCR if previous bootloader stage couldn't
No need to allocate memory in the common code, so EFI copies the
discovered buffer like it did before
Rename efi measure_event function

Changes since v2:
- Add documentation.
- Changed reserved memory address to the top of the RAM for sandbox dts.
- Add measure state to booti and bootz.
- Skip measurement for EFI images that should be measured

Changes since v1:
- Refactor TPM layer functions to allow EFI system to use them, and
remove duplicate EFI functions.
- Add test case
- Drop #ifdefs for bootm
- Add devicetree measurement config option
- Update sandbox TPM driver

Eddie James (6):
tpm: Fix spelling for tpmu_ha union
tpm: sandbox: Update for needed TPM2 capabilities
tpm: Support boot measurements
bootm: Support boot measurement
test: Add sandbox TPM boot measurement
doc: Add measured boot documentation

arch/sandbox/dts/sandbox.dtsi | 13 +
arch/sandbox/dts/test.dts | 13 +
boot/Kconfig | 23 +
boot/bootm.c | 72 +++
cmd/booti.c | 1 +
cmd/bootm.c | 2 +
cmd/bootz.c | 1 +
configs/sandbox_defconfig | 1 +
doc/usage/index.rst | 1 +
doc/usage/measured_boot.rst | 23 +
drivers/tpm/tpm2_tis_sandbox.c | 100 ++-
include/bootm.h | 11 +
include/efi_tcg2.h | 44 --
include/image.h | 1 +
include/test/suites.h | 1 +
include/tpm-v2.h | 252 +++++++-
lib/Kconfig | 4 +
lib/efi_loader/Kconfig | 2 -
lib/efi_loader/efi_tcg2.c | 1054 +++-----------------------------
lib/tpm-v2.c | 804 ++++++++++++++++++++++++
test/boot/Makefile | 1 +
test/boot/measurement.c | 66 ++
test/cmd_ut.c | 4 +
23 files changed, 1441 insertions(+), 1053 deletions(-)
create mode 100644 doc/usage/measured_boot.rst
create mode 100644 test/boot/measurement.c

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2.31.1