From 4c0851cc37f42ed88d62b876357b71cfdaac480f Mon Sep 17 00:00:00 2001 From: Vadim Bendebury Date: Sun, 3 Jul 2016 17:08:10 -0700 Subject: tpm2: implement locking firmware rollback counter TPM1.2 is using the somewhat misnamed tlcl_set_global_lock() command function to lock the hardware rollback counter. For TPM2 let's implement and use the TPM2 command to lock an NV Ram location (TPM2_NV_WriteLock). BRANCH=none BUG=chrome-os-partner:50645 TEST=verified that TPM2_NV_WriteLock command is invoked before RO firmware starts RW, and succeeds. Change-Id: I52aa8db95b908488ec4cf0843afeb6310dc7f38b Signed-off-by: Martin Roth Original-Commit-Id: 2f859335dfccfeea900f15bbb8c6cb3fd5ec8c77 Original-Change-Id: I62f22b9991522d4309cccc44180a5ebd4dca488d Original-Signed-off-by: Vadim Bendebury Original-Reviewed-on: https://chromium-review.googlesource.com/358097 Original-Reviewed-by: Aaron Durbin Original-Reviewed-by: Darren Krahn Reviewed-on: https://review.coreboot.org/15638 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi --- src/include/tpm_lite/tlcl.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/include') diff --git a/src/include/tpm_lite/tlcl.h b/src/include/tpm_lite/tlcl.h index 1a4f63865d..8ea5564ecb 100644 --- a/src/include/tpm_lite/tlcl.h +++ b/src/include/tpm_lite/tlcl.h @@ -135,6 +135,11 @@ uint32_t tlcl_get_flags(uint8_t *disable, uint8_t *deactivated, */ uint32_t tlcl_set_global_lock(void); +/** + * Make an NV Ram location read_only. The TPM error code is returned. + */ +uint32_t tlcl_lock_nv_write(uint32_t index); + /** * Perform a TPM_Extend. */ -- cgit v1.2.3