On 2/21/23 23:36, Joel Stanley wrote:
On Thu, 2 Feb 2023 at 17:08, Eddie James eajames@linux.ibm.com wrote:
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: https://lore.kernel.org/u-boot/20230126081844.591148-1-ilias.apalodimas@lina...
Nice work Eddie. It looks like you're closing in on the issues Ilias and Simon have.
I did some testing and found some missing dependencies from running 'make check':
sandbox_spl: +make O=/home/joel/dev/u-boot/upstream/build-sandbox_spl -s sandbox_spl_defconfig +make O=/home/joel/dev/u-boot/upstream/build-sandbox_spl -s -j8 /usr/bin/ld: warning: test/overlay/test-fdt-overlay-stacked.dtb.o: missing .note.GNU-stack section implies executable stack /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker /usr/bin/ld: /tmp/cc8cNroX.ltrans22.ltrans.o:(.data.rel+0x440): undefined reference to `do_ut_measurement' collect2: error: ld returned 1 exit status make[2]: *** [/home/joel/dev/u-boot/upstream/Makefile:1752: u-boot] Error 1
There's a few variants of the sandbox defconfig. I'm not sure if we want to exclude the measurement code from those configs, or add it to the configs.
Thanks Joel. I feel the right thing here would be to only build the measurement test when CONFIG_MEASURED_BOOT is enabled, so I'll make that change.
When fixing them up to add CONFIG_MEASURED_BOOT=y we still fail to link:
sandbox_spl: +make O=/home/joel/dev/u-boot/upstream/build-sandbox_spl -s sandbox_spl_defconfig +make O=/home/joel/dev/u-boot/upstream/build-sandbox_spl -s -j8 /usr/bin/ld: warning: test/overlay/test-fdt-overlay-stacked.dtb.o: missing .note.GNU-stack section implies executable stack /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker /usr/bin/ld: /tmp/ccRuOSFi.ltrans17.ltrans.o: in function `tcg2_create_digest': /home/joel/dev/u-boot/upstream/build-sandbox_spl/../lib/tpm-v2.c:112: undefined reference to `sha512_starts' /usr/bin/ld: /home/joel/dev/u-boot/upstream/build-sandbox_spl/../lib/tpm-v2.c:113: undefined reference to `sha512_update' /usr/bin/ld: /home/joel/dev/u-boot/upstream/build-sandbox_spl/../lib/tpm-v2.c:114: undefined reference to `sha512_finish' /usr/bin/ld: /home/joel/dev/u-boot/upstream/build-sandbox_spl/../lib/tpm-v2.c:106: undefined reference to `sha384_starts' /usr/bin/ld: /home/joel/dev/u-boot/upstream/build-sandbox_spl/../lib/tpm-v2.c:107: undefined reference to `sha384_update' /usr/bin/ld: /home/joel/dev/u-boot/upstream/build-sandbox_spl/../lib/tpm-v2.c:108: undefined reference to `sha384_finish' collect2: error: ld returned 1 exit status
This sorted that out for me:
--- a/lib/Kconfig +++ b/lib/Kconfig @@ -411,6 +411,8 @@ config TPM bool "Trusted Platform Module (TPM) Support" depends on DM imply DM_RNG
select SHA512select SHA384The tree I tested with is here: https://github.com/shenki/u-boot/commits/measured-boot
Thanks, I'll select those.
Eddie
Cheers,
Joel
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: Support boot measurements bootm: Support boot measurement tpm: sandbox: Update for needed TPM2 capabilities test: Add sandbox TPM boot measurement doc: Add measured boot documentation
arch/sandbox/dts/sandbox.dtsi | 14 + arch/sandbox/dts/test.dts | 13 + boot/Kconfig | 23 + boot/bootm.c | 70 +++ 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 | 2 + include/efi_tcg2.h | 44 -- include/image.h | 1 + include/test/suites.h | 1 + include/tpm-v2.h | 246 +++++++- lib/efi_loader/efi_tcg2.c | 1010 +++----------------------------- lib/tpm-v2.c | 771 ++++++++++++++++++++++++ test/boot/Makefile | 1 + test/boot/measurement.c | 66 +++ test/cmd_ut.c | 2 + 21 files changed, 1383 insertions(+), 1010 deletions(-) create mode 100644 doc/usage/measured_boot.rst create mode 100644 test/boot/measurement.c
-- 2.31.1