From 012809cdca4b876e675cbd181fee213133858a5e Mon Sep 17 00:00:00 2001
From: Guomin Jiang <guomin.jiang@intel.com>
Date: Mon, 29 Jun 2020 14:50:21 +0800
Subject: [PATCH] SecurityPkg/Tcg2Pei: Use Migrated FV Info Hob for calculating
 hash (CVE-2019-11098)

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>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@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 4852d86..651a60c 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 3d361e8..367df21 100644
--- a/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf
+++ b/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.inf
@@ -63,6 +63,7 @@
   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
-- 
2.27.0

