[PATCH 6/6] SecurityPkg/Tcg2Pei: Use Migrated FV Info Hob for calculating hash (CVE-2019-11098)

["Guomin Jiang" <guomin.jiang@intel.com>]

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1614

When we allocate pool to save rebased the PEIMs, the address will change
randomly, therefore the hash will change and result PCR0 change as well.
To avoid this, we save the raw PEIMs and use it to calculate hash.
The Tcg2Pei calculate the hash and it use the Migrated FV Info.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
---
 SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c   | 31 ++++++++++++++++++++++++++---
 SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf |  1 +
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c
index 4852d8690617..651a60c1f0e2 100644
--- a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c
+++ b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c
@@ -21,6 +21,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #include <Guid/TcgEventHob.h>
 #include <Guid/MeasuredFvHob.h>
 #include <Guid/TpmInstance.h>
+#include <Guid/MigratedFvInfo.h>
 
 #include <Library/DebugLib.h>
 #include <Library/BaseMemoryLib.h>
@@ -536,6 +537,10 @@ MeasureFvImage (
   EDKII_PEI_FIRMWARE_VOLUME_INFO_PREHASHED_FV_PPI       *PrehashedFvPpi;
   HASH_INFO                                             *PreHashInfo;
   UINT32                                                HashAlgoMask;
+  EFI_PHYSICAL_ADDRESS                                  FvOrgBase;
+  EFI_PHYSICAL_ADDRESS                                  FvDataBase;
+  EFI_PEI_HOB_POINTERS                                  Hob;
+  EDKII_MIGRATED_FV_INFO                                *MigratedFvInfo;
 
   //
   // Check Excluded FV list
@@ -621,6 +626,26 @@ MeasureFvImage (
     Instance++;
   } while (!EFI_ERROR(Status));
 
+  //
+  // Search the matched migration FV info
+  //
+  FvOrgBase  = FvBase;
+  FvDataBase = FvBase;
+  Hob.Raw  = GetFirstGuidHob (&gEdkiiMigratedFvInfoGuid);
+  while (Hob.Raw != NULL) {
+    MigratedFvInfo = GET_GUID_HOB_DATA (Hob);
+    if ((MigratedFvInfo->FvNewBase == (UINT32) FvBase) && (MigratedFvInfo->FvLength == (UINT32) FvLength)) {
+      //
+      // Found the migrated FV info
+      //
+      FvOrgBase  = (EFI_PHYSICAL_ADDRESS) (UINTN) MigratedFvInfo->FvOrgBase;
+      FvDataBase = (EFI_PHYSICAL_ADDRESS) (UINTN) MigratedFvInfo->FvDataBase;
+      break;
+    }
+    Hob.Raw = GET_NEXT_HOB (Hob);
+    Hob.Raw = GetNextGuidHob (&gEdkiiMigratedFvInfoGuid, Hob.Raw);
+  }
+
   //
   // Init the log event for FV measurement
   //
@@ -631,13 +656,13 @@ MeasureFvImage (
     if (FvName != NULL) {
       AsciiSPrint ((CHAR8 *)FvBlob2.BlobDescription, sizeof(FvBlob2.BlobDescription), "Fv(%g)", FvName);
     }
-    FvBlob2.BlobBase      = FvBase;
+    FvBlob2.BlobBase      = FvOrgBase;
     FvBlob2.BlobLength    = FvLength;
     TcgEventHdr.EventType = EV_EFI_PLATFORM_FIRMWARE_BLOB2;
     TcgEventHdr.EventSize = sizeof (FvBlob2);
     EventData             = &FvBlob2;
   } else {
-    FvBlob.BlobBase       = FvBase;
+    FvBlob.BlobBase       = FvOrgBase;
     FvBlob.BlobLength     = FvLength;
     TcgEventHdr.PCRIndex  = 0;
     TcgEventHdr.EventType = EV_EFI_PLATFORM_FIRMWARE_BLOB;
@@ -672,7 +697,7 @@ MeasureFvImage (
     //
     Status = HashLogExtendEvent (
                0,
-               (UINT8*) (UINTN) FvBase, // HashData
+               (UINT8*) (UINTN) FvDataBase, // HashData
                (UINTN) FvLength,        // HashDataLen
                &TcgEventHdr,            // EventHdr
                EventData                // EventData
diff --git a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf
index 3d361e8859e7..367df21eedaf 100644
--- a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf
+++ b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf
@@ -63,6 +63,7 @@ [Guids]
   gTcgEvent2EntryHobGuid                                               ## PRODUCES               ## HOB
   gEfiTpmDeviceInstanceNoneGuid                                        ## SOMETIMES_PRODUCES     ## GUID       # TPM device identifier
   gEfiTpmDeviceInstanceTpm12Guid                                       ## SOMETIMES_PRODUCES     ## GUID       # TPM device identifier
+  gEdkiiMigratedFvInfoGuid                                             ## SOMETIMES_CONSUMES     ## HOB
 
 [Ppis]
   gEfiPeiFirmwareVolumeInfoPpiGuid                                     ## SOMETIMES_CONSUMES     ## NOTIFY
-- 
2.25.1.windows.1