Use firmware version instead of hardcode string for S-CRTM version identifier

Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by  : Fu, Siyuan <siyuan.fu@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13677 6f19259b-4bc3-4df7-8a09-765794883524

SecurityPkg/Tcg/TcgPei/TcgPei.c

@@ -29,6 +29,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Library/HobLib.h>
 #include <Library/PcdLib.h>
 #include <Library/PeiServicesTablePointerLib.h>
+#include <Library/BaseLib.h>
 
 #include "TpmComm.h"
 
@@ -90,8 +91,6 @@ EFI_PEI_NOTIFY_DESCRIPTOR           mNotifyList[] = {
   }
 };
 
-CHAR8 mSCrtmVersion[] = "{D20BC7C6-A1A5-415c-AE85-38290AB6BE04}";
-
 EFI_PLATFORM_FIRMWARE_BLOB mMeasuredFvInfo[FixedPcdGet32 (PcdPeiCoreMaxFvSupported)];
 UINT32 mMeasuredFvIndex = 0;
 
@@ -180,20 +179,21 @@ MeasureCRTMVersion (
   TCG_PCR_EVENT_HDR                 TcgEventHdr;
 
   //
-  // Here, only a static GUID is measured instead of real CRTM version.
+  // Use FirmwareVersion string to represent CRTM version.
   // OEMs should get real CRTM version string and measure it.
   //
 
   TcgEventHdr.PCRIndex  = 0;
   TcgEventHdr.EventType = EV_S_CRTM_VERSION;
-  TcgEventHdr.EventSize = sizeof (mSCrtmVersion);
+  TcgEventHdr.EventSize = StrSize((CHAR16*)PcdGetPtr (PcdFirmwareVersionString));
+
   return HashLogExtendEvent (
            PeiServices,
-           (UINT8*)&mSCrtmVersion,
+           (UINT8*)PcdGetPtr (PcdFirmwareVersionString),
            TcgEventHdr.EventSize,
            TpmHandle,
            &TcgEventHdr,
-           (UINT8*)&mSCrtmVersion
+           (UINT8*)PcdGetPtr (PcdFirmwareVersionString)
            );
 }
 

SecurityPkg/Tcg/TcgPei/TcgPei.inf

@@ -46,6 +46,8 @@
   TimerLib
   IoLib
   PeiServicesTablePointerLib
+  BaseLib
+  PcdLib
 
 [Guids]
   gTcgEventEntryHobGuid
@@ -64,6 +66,7 @@
 [FixedPcd]
   gEfiSecurityPkgTokenSpaceGuid.PcdHideTpmSupport
   gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreMaxFvSupported             ## CONSUMES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFirmwareVersionString             ## CONSUMES
 
 [Depex]
   gEfiPeiMasterBootModePpiGuid AND