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authorVadim Bendebury <vbendeb@chromium.org>2016-07-03 17:08:10 -0700
committerMartin Roth <martinroth@google.com>2016-07-14 00:00:14 +0200
commit4c0851cc37f42ed88d62b876357b71cfdaac480f (patch)
tree096758fe9295f44382e07a5b2856182e5cd0dbd8 /src/include
parent1ec76030edb631a1d37d6c9ad9d3791795681c11 (diff)
downloadcoreboot-4c0851cc37f42ed88d62b876357b71cfdaac480f.tar.xz
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 <martinroth@chromium.org> Original-Commit-Id: 2f859335dfccfeea900f15bbb8c6cb3fd5ec8c77 Original-Change-Id: I62f22b9991522d4309cccc44180a5ebd4dca488d Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/358097 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-by: Darren Krahn <dkrahn@chromium.org> Reviewed-on: https://review.coreboot.org/15638 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/tpm_lite/tlcl.h5
1 files changed, 5 insertions, 0 deletions
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
@@ -136,6 +136,11 @@ 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.
*/
uint32_t tlcl_extend(int pcr_num, const uint8_t *in_digest,