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OvmfPkg/SecTpmMeasurementLib: Fix the mapping error of PCR and RTMR index

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4179

TDVF has the feature to do RTMR measurement in SEC phase. In the same time
it builds a GUID hob which carries the hash value of the measurement so
that in DXE phase a td event can be created based on this GUID Hob. There
is a mapping error between TPM PCR index and RTMR index according to UEFI
2.10. That PCR6 is missing in the mapping. This patch fixes this issue.

Cc: Erdem Aktas <erdemaktas@google.com> [ruleof2]
Cc: James Bottomley <jejb@linux.ibm.com> [jejb]
Cc: Jiewen Yao <jiewen.yao@intel.com> [jyao1]
Cc: Tom Lendacky <thomas.lendacky@amd.com> [tlendacky]
Cc: Arti Gupta <ARGU@microsoft.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Min M Xu 2022-12-14 15:14:19 +08:00 committed by mergify[bot]
parent fb91d6cbd0
commit 01c0d3c0d5
1 changed files with 3 additions and 4 deletions
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7
SecurityPkg/Library/SecTpmMeasurementLib/SecTpmMeasurementLibTdx.c
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@ -33,12 +33,11 @@ typedef struct {
/**
Get the mapped RTMR index based on the input PCRIndex.
RTMR[0] => PCR[1,7]
RTMR[1] => PCR[2,3,4,5]
RTMR[1] => PCR[2,3,4,5,6]
RTMR[2] => PCR[8~15]
RTMR[3] => NA
Note:
PCR[0] is mapped to MRTD and should not appear here.
PCR[6] is reserved for OEM. It is not used.
@param[in] PCRIndex The input PCR index
@ -51,7 +50,7 @@ GetMappedRtmrIndex (
{
UINT8 RtmrIndex;
if ((PCRIndex == 6) || (PCRIndex == 0) || (PCRIndex > 15)) {
if ((PCRIndex == 0) || (PCRIndex > 15)) {
DEBUG ((DEBUG_ERROR, "Invalid PCRIndex(%d) map to MR Index.\n", PCRIndex));
ASSERT (FALSE);
return INVALID_PCR2MR_INDEX;
@ -60,7 +59,7 @@ GetMappedRtmrIndex (
RtmrIndex = 0;
if ((PCRIndex == 1) || (PCRIndex == 7)) {
RtmrIndex = 0;
} else if ((PCRIndex >= 2) && (PCRIndex < 6)) {
} else if ((PCRIndex >= 2) && (PCRIndex <= 6)) {
RtmrIndex = 1;
} else if ((PCRIndex >= 8) && (PCRIndex <= 15)) {
RtmrIndex = 2;