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- /** @file
- Build GuidHob for tdx measurement.
- Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <PiPei.h>
- #include <Library/BaseLib.h>
- #include <Library/BaseMemoryLib.h>
- #include <Library/DebugLib.h>
- #include <IndustryStandard/Tpm20.h>
- #include <IndustryStandard/UefiTcgPlatform.h>
- #include <Library/HobLib.h>
- #include <Library/PrintLib.h>
- #include <Library/TcgEventLogRecordLib.h>
- #include <WorkArea.h>
- #pragma pack(1)
- #define HANDOFF_TABLE_DESC "TdxTable"
- typedef struct {
- UINT8 TableDescriptionSize;
- UINT8 TableDescription[sizeof (HANDOFF_TABLE_DESC)];
- UINT64 NumberOfTables;
- EFI_CONFIGURATION_TABLE TableEntry[1];
- } TDX_HANDOFF_TABLE_POINTERS2;
- #pragma pack()
- #define FV_HANDOFF_TABLE_DESC "Fv(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)"
- typedef PLATFORM_FIRMWARE_BLOB2_STRUCT CFV_HANDOFF_TABLE_POINTERS2;
- /**
- * Build GuidHob for Tdx measurement.
- *
- * Tdx measurement includes the measurement of TdHob and CFV. They're measured
- * and extended to RTMR registers in SEC phase. Because at that moment the Hob
- * service are not available. So the values of the measurement are saved in
- * workarea and will be built into GuidHob after the Hob service is ready.
- *
- * @param RtmrIndex RTMR index
- * @param EventType Event type
- * @param EventData Event data
- * @param EventSize Size of event data
- * @param HashValue Hash value
- * @param HashSize Size of hash
- *
- * @retval EFI_SUCCESS Successfully build the GuidHobs
- * @retval Others Other error as indicated
- */
- STATIC
- EFI_STATUS
- BuildTdxMeasurementGuidHob (
- UINT32 RtmrIndex,
- UINT32 EventType,
- UINT8 *EventData,
- UINT32 EventSize,
- UINT8 *HashValue,
- UINT32 HashSize
- )
- {
- VOID *EventHobData;
- UINT8 *Ptr;
- TPML_DIGEST_VALUES *TdxDigest;
- if (HashSize != SHA384_DIGEST_SIZE) {
- return EFI_INVALID_PARAMETER;
- }
- #define TDX_DIGEST_VALUE_LEN (sizeof (UINT32) + sizeof (TPMI_ALG_HASH) + SHA384_DIGEST_SIZE)
- EventHobData = BuildGuidHob (
- &gCcEventEntryHobGuid,
- sizeof (TCG_PCRINDEX) + sizeof (TCG_EVENTTYPE) +
- TDX_DIGEST_VALUE_LEN +
- sizeof (UINT32) + EventSize
- );
- if (EventHobData == NULL) {
- return EFI_OUT_OF_RESOURCES;
- }
- Ptr = (UINT8 *)EventHobData;
- //
- // There are 2 types of measurement registers in TDX: MRTD and RTMR[0-3].
- // According to UEFI Spec 2.10 Section 38.4.1, RTMR[0-3] is mapped to MrIndex[1-4].
- // So RtmrIndex must be increased by 1 before the event log is created.
- //
- RtmrIndex++;
- CopyMem (Ptr, &RtmrIndex, sizeof (UINT32));
- Ptr += sizeof (UINT32);
- CopyMem (Ptr, &EventType, sizeof (TCG_EVENTTYPE));
- Ptr += sizeof (TCG_EVENTTYPE);
- TdxDigest = (TPML_DIGEST_VALUES *)Ptr;
- TdxDigest->count = 1;
- TdxDigest->digests[0].hashAlg = TPM_ALG_SHA384;
- CopyMem (
- TdxDigest->digests[0].digest.sha384,
- HashValue,
- SHA384_DIGEST_SIZE
- );
- Ptr += TDX_DIGEST_VALUE_LEN;
- CopyMem (Ptr, &EventSize, sizeof (UINT32));
- Ptr += sizeof (UINT32);
- CopyMem (Ptr, (VOID *)EventData, EventSize);
- Ptr += EventSize;
- return EFI_SUCCESS;
- }
- /**
- Get the FvName from the FV header.
- Causion: The FV is untrusted input.
- @param[in] FvBase Base address of FV image.
- @param[in] FvLength Length of FV image.
- @return FvName pointer
- @retval NULL FvName is NOT found
- **/
- VOID *
- GetFvName (
- IN EFI_PHYSICAL_ADDRESS FvBase,
- IN UINT64 FvLength
- )
- {
- EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
- EFI_FIRMWARE_VOLUME_EXT_HEADER *FvExtHeader;
- if (FvBase >= MAX_ADDRESS) {
- return NULL;
- }
- if (FvLength >= MAX_ADDRESS - FvBase) {
- return NULL;
- }
- if (FvLength < sizeof (EFI_FIRMWARE_VOLUME_HEADER)) {
- return NULL;
- }
- FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)FvBase;
- if (FvHeader->ExtHeaderOffset < sizeof (EFI_FIRMWARE_VOLUME_HEADER)) {
- return NULL;
- }
- if (FvHeader->ExtHeaderOffset + sizeof (EFI_FIRMWARE_VOLUME_EXT_HEADER) > FvLength) {
- return NULL;
- }
- FvExtHeader = (EFI_FIRMWARE_VOLUME_EXT_HEADER *)(UINTN)(FvBase + FvHeader->ExtHeaderOffset);
- return &FvExtHeader->FvName;
- }
- /**
- Build the GuidHob for tdx measurements which were done in SEC phase.
- The measurement values are stored in WorkArea.
- @retval EFI_SUCCESS The GuidHob is built successfully
- @retval Others Other errors as indicated
- **/
- EFI_STATUS
- InternalBuildGuidHobForTdxMeasurement (
- VOID
- )
- {
- EFI_STATUS Status;
- OVMF_WORK_AREA *WorkArea;
- VOID *TdHobList;
- TDX_HANDOFF_TABLE_POINTERS2 HandoffTables;
- VOID *FvName;
- CFV_HANDOFF_TABLE_POINTERS2 FvBlob2;
- EFI_PHYSICAL_ADDRESS FvBase;
- UINT64 FvLength;
- UINT8 *HashValue;
- if (!TdIsEnabled ()) {
- ASSERT (FALSE);
- return EFI_UNSUPPORTED;
- }
- WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
- if (WorkArea == NULL) {
- return EFI_ABORTED;
- }
- Status = EFI_SUCCESS;
- //
- // Build the GuidHob for TdHob measurement
- //
- TdHobList = (VOID *)(UINTN)FixedPcdGet32 (PcdOvmfSecGhcbBase);
- if (WorkArea->TdxWorkArea.SecTdxWorkArea.TdxMeasurementsData.MeasurementsBitmap & TDX_MEASUREMENT_TDHOB_BITMASK) {
- HashValue = WorkArea->TdxWorkArea.SecTdxWorkArea.TdxMeasurementsData.TdHobHashValue;
- HandoffTables.TableDescriptionSize = sizeof (HandoffTables.TableDescription);
- CopyMem (HandoffTables.TableDescription, HANDOFF_TABLE_DESC, sizeof (HandoffTables.TableDescription));
- HandoffTables.NumberOfTables = 1;
- CopyGuid (&(HandoffTables.TableEntry[0].VendorGuid), &gUefiOvmfPkgTokenSpaceGuid);
- HandoffTables.TableEntry[0].VendorTable = TdHobList;
- Status = BuildTdxMeasurementGuidHob (
- 0, // RtmrIndex
- EV_EFI_HANDOFF_TABLES2, // EventType
- (UINT8 *)(UINTN)&HandoffTables, // EventData
- sizeof (HandoffTables), // EventSize
- HashValue, // HashValue
- SHA384_DIGEST_SIZE // HashSize
- );
- }
- if (EFI_ERROR (Status)) {
- ASSERT (FALSE);
- return Status;
- }
- //
- // Build the GuidHob for Cfv measurement
- //
- if (WorkArea->TdxWorkArea.SecTdxWorkArea.TdxMeasurementsData.MeasurementsBitmap & TDX_MEASUREMENT_CFVIMG_BITMASK) {
- HashValue = WorkArea->TdxWorkArea.SecTdxWorkArea.TdxMeasurementsData.CfvImgHashValue;
- FvBase = (UINT64)PcdGet32 (PcdOvmfFlashNvStorageVariableBase);
- FvLength = (UINT64)PcdGet32 (PcdCfvRawDataSize);
- FvBlob2.BlobDescriptionSize = sizeof (FvBlob2.BlobDescription);
- CopyMem (FvBlob2.BlobDescription, FV_HANDOFF_TABLE_DESC, sizeof (FvBlob2.BlobDescription));
- FvName = GetFvName (FvBase, FvLength);
- if (FvName != NULL) {
- AsciiSPrint ((CHAR8 *)FvBlob2.BlobDescription, sizeof (FvBlob2.BlobDescription), "Fv(%g)", FvName);
- }
- FvBlob2.BlobBase = FvBase;
- FvBlob2.BlobLength = FvLength;
- Status = BuildTdxMeasurementGuidHob (
- 0, // RtmrIndex
- EV_EFI_PLATFORM_FIRMWARE_BLOB2, // EventType
- (VOID *)&FvBlob2, // EventData
- sizeof (FvBlob2), // EventSize
- HashValue, // HashValue
- SHA384_DIGEST_SIZE // HashSize
- );
- }
- if (EFI_ERROR (Status)) {
- ASSERT (FALSE);
- return Status;
- }
- return EFI_SUCCESS;
- }
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