[PATCH v8 5/9] MdeModulePkg/Core: Create 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 the rebased 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 MigratedFvInfo HOB will never produce when
PcdMigrateTemporaryRamFirmwareVolumes is FALSE, because the PCD control
the total feature.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Debkumar De <debkumar.de@intel.com>
Cc: Harry Han <harry.han@intel.com>
Cc: Catharine West <catharine.west@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
---
 MdeModulePkg/MdeModulePkg.dec                 |  3 ++
 MdeModulePkg/Core/Pei/PeiMain.inf             |  1 +
 MdeModulePkg/Core/Pei/PeiMain.h               |  1 +
 MdeModulePkg/Include/Guid/MigratedFvInfo.h    | 22 +++++++++++++++
 MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c | 28 +++++++++++++++++++
 5 files changed, 55 insertions(+)
 create mode 100644 MdeModulePkg/Include/Guid/MigratedFvInfo.h

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 45874e9c8236..d7572eedd18c 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -389,6 +389,9 @@ [Guids]
   ## GUID indicates the capsule is to store Capsule On Disk file names.
   gEdkiiCapsuleOnDiskNameGuid = { 0x98c80a4f, 0xe16b, 0x4d11, { 0x93, 0x9a, 0xab, 0xe5, 0x61, 0x26, 0x3, 0x30 } }
 
+  ## Include/Guid/MigratedFvInfo.h
+  gEdkiiMigratedFvInfoGuid = { 0xc1ab12f7, 0x74aa, 0x408d, { 0xa2, 0xf4, 0xc6, 0xce, 0xfd, 0x17, 0x98, 0x71 } }
+
 [Ppis]
   ## Include/Ppi/AtaController.h
   gPeiAtaControllerPpiGuid       = { 0xa45e60d1, 0xc719, 0x44aa, { 0xb0, 0x7a, 0xaa, 0x77, 0x7f, 0x85, 0x90, 0x6d }}
diff --git a/MdeModulePkg/Core/Pei/PeiMain.inf b/MdeModulePkg/Core/Pei/PeiMain.inf
index 5b36d516b3fa..0cf357371a16 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.inf
+++ b/MdeModulePkg/Core/Pei/PeiMain.inf
@@ -77,6 +77,7 @@ [Guids]
   ## CONSUMES   ## GUID      # Used to compare with FV's file system GUID and get the FV's file system format
   gEfiFirmwareFileSystem3Guid
   gStatusCodeCallbackGuid
+  gEdkiiMigratedFvInfoGuid                      ## SOMETIMES_PRODUCES     ## HOB
 
 [Ppis]
   gEfiPeiStatusCodePpiGuid                      ## SOMETIMES_CONSUMES # PeiReportStatusService is not ready if this PPI doesn't exist
diff --git a/MdeModulePkg/Core/Pei/PeiMain.h b/MdeModulePkg/Core/Pei/PeiMain.h
index 6d95a5d32c78..c27e8fc33bc6 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.h
+++ b/MdeModulePkg/Core/Pei/PeiMain.h
@@ -44,6 +44,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #include <Guid/FirmwareFileSystem2.h>
 #include <Guid/FirmwareFileSystem3.h>
 #include <Guid/AprioriFileName.h>
+#include <Guid/MigratedFvInfo.h>
 
 ///
 /// It is an FFS type extension used for PeiFindFileEx. It indicates current
diff --git a/MdeModulePkg/Include/Guid/MigratedFvInfo.h b/MdeModulePkg/Include/Guid/MigratedFvInfo.h
new file mode 100644
index 000000000000..061c17ed0e48
--- /dev/null
+++ b/MdeModulePkg/Include/Guid/MigratedFvInfo.h
@@ -0,0 +1,22 @@
+/** @file
+  Migrated FV information
+
+Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __EDKII_MIGRATED_FV_INFO_GUID_H__
+#define __EDKII_MIGRATED_FV_INFO_GUID_H__
+
+typedef struct {
+  UINT32           FvOrgBase;  // original FV address
+  UINT32           FvNewBase;  // new FV address
+  UINT32           FvDataBase; // original FV data
+  UINT32           FvLength;   // Fv Length
+} EDKII_MIGRATED_FV_INFO;
+
+extern EFI_GUID gEdkiiMigratedFvInfoGuid;
+
+#endif // #ifndef __EDKII_MIGRATED_FV_INFO_GUID_H__
+
diff --git a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
index 5bc0f8674d60..b9a279ec73a2 100644
--- a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
+++ b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
@@ -1234,10 +1234,12 @@ EvacuateTempRam (
   EFI_FIRMWARE_VOLUME_HEADER    *FvHeader;
   EFI_FIRMWARE_VOLUME_HEADER    *ChildFvHeader;
   EFI_FIRMWARE_VOLUME_HEADER    *MigratedFvHeader;
+  EFI_FIRMWARE_VOLUME_HEADER    *RawDataFvHeader;
   EFI_FIRMWARE_VOLUME_HEADER    *MigratedChildFvHeader;
 
   PEI_CORE_FV_HANDLE            PeiCoreFvHandle;
   EFI_PEI_CORE_FV_LOCATION_PPI  *PeiCoreFvLocationPpi;
+  EDKII_MIGRATED_FV_INFO        MigratedFvInfo;
 
   ASSERT (Private->PeiMemoryInstalled);
 
@@ -1274,6 +1276,9 @@ EvacuateTempRam (
         (((EFI_PHYSICAL_ADDRESS)(UINTN) FvHeader + (FvHeader->FvLength - 1)) < Private->FreePhysicalMemoryTop)
         )
       ) {
+      //
+      // Allocate page to save the rebased PEIMs, the PEIMs will get dispatched later.
+      //
       Status =  PeiServicesAllocatePages (
                   EfiBootServicesCode,
                   EFI_SIZE_TO_PAGES ((UINTN) FvHeader->FvLength),
@@ -1281,6 +1286,17 @@ EvacuateTempRam (
                   );
       ASSERT_EFI_ERROR (Status);
 
+      //
+      // Allocate pool to save the raw PEIMs, which is used to keep consistent context across
+      // multiple boot and PCR0 will keep the same no matter if the address of allocated page is changed.
+      //
+      Status =  PeiServicesAllocatePages (
+                  EfiBootServicesCode,
+                  EFI_SIZE_TO_PAGES ((UINTN) FvHeader->FvLength),
+                  (EFI_PHYSICAL_ADDRESS *) &RawDataFvHeader
+                  );
+      ASSERT_EFI_ERROR (Status);
+
       DEBUG ((
         DEBUG_VERBOSE,
         "  Migrating FV[%d] from 0x%08X to 0x%08X\n",
@@ -1289,7 +1305,19 @@ EvacuateTempRam (
         (UINTN) MigratedFvHeader
         ));
 
+      //
+      // Copy the context to the rebased pages and raw pages, and create hob to save the
+      // information. The MigratedFvInfo HOB will never be produced when
+      // PcdMigrateTemporaryRamFirmwareVolumes is FALSE, because the PCD control the
+      // feature.
+      //
       CopyMem (MigratedFvHeader, FvHeader, (UINTN) FvHeader->FvLength);
+      CopyMem (RawDataFvHeader, MigratedFvHeader, (UINTN) FvHeader->FvLength);
+      MigratedFvInfo.FvOrgBase  = (UINT32) (UINTN) FvHeader;
+      MigratedFvInfo.FvNewBase  = (UINT32) (UINTN) MigratedFvHeader;
+      MigratedFvInfo.FvDataBase = (UINT32) (UINTN) RawDataFvHeader;
+      MigratedFvInfo.FvLength   = (UINT32) (UINTN) FvHeader->FvLength;
+      BuildGuidDataHob (&gEdkiiMigratedFvInfoGuid, &MigratedFvInfo, sizeof (MigratedFvInfo));
 
       //
       // Migrate any children for this FV now
-- 
2.25.1.windows.1