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SecurityPkg/Tcg2Smm: harden NVS/SMI state initialization

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Signed-off-by: 20000419 <lzy20000419@outlook.com>
This commit is contained in:
20000419 2026-03-08 20:20:46 +08:00 • committed by mergify[bot]
parent d372c29fab
commit 6fb6ef54e7
1 changed files with 11 additions and 4 deletions
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15
SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
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@ -17,10 +17,10 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include "Tcg2Smm.h"
EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable = NULL;
TCG_NVS *mTcgNvs = NULL;
UINTN mPpSoftwareSmi;
UINTN mMcSoftwareSmi;
EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable = NULL;
TCG_NVS *mTcgNvs = NULL;
UINTN mPpSoftwareSmi = MAX_UINTN;
UINTN mMcSoftwareSmi = MAX_UINTN;
EFI_HANDLE mReadyToLockHandle;
/**
@ -144,6 +144,11 @@ PhysicalPresenceCallback (
UINT32 OperationRequest;
UINT32 RequestParameter;
if (mTcgNvs == NULL) {
DEBUG ((DEBUG_ERROR, "[%a] mTcgNvs has not been initialized yet\n", __func__));
return EFI_SUCCESS;
}
if (mTcgNvs->PhysicalPresence.Parameter == TCG_ACPI_FUNCTION_RETURN_REQUEST_RESPONSE_TO_OS) {
mTcgNvs->PhysicalPresence.ReturnCode = Tcg2PhysicalPresenceLibReturnOperationResponseToOsFunction (
&MostRecentRequest,
@ -233,6 +238,8 @@ InitializeTcgCommon (
PpSwHandle = NULL;
McSwHandle = NULL;
NotifyHandle = NULL;
mPpSoftwareSmi = MAX_UINTN;
mMcSoftwareSmi = MAX_UINTN;
// Register a root handler to communicate the NVS region and SMI channel between MM and DXE
Status = gMmst->MmiHandlerRegister (TpmNvsCommunciate, &gTpmNvsMmGuid, &mReadyToLockHandle);