File ovmf-bsc1188371-SecurityPkg-TcgPei-Use-Migrated-FV-Info-Hob-for-calc.patch of Package ovmf.27284
From ffde22468e2f0e93b51f97b801e6c7a181088c61 Mon Sep 17 00:00:00 2001
From: Guomin Jiang <guomin.jiang@intel.com>
Date: Wed, 8 Jul 2020 16:01:14 +0800
Subject: [PATCH 9/9] SecurityPkg/TcgPei: 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 TcgPei 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/TcgPei/TcgPei.c | 29 +++++++++++++++++++++++++++--
SecurityPkg/Tcg/TcgPei/TcgPei.inf | 1 +
2 files changed, 28 insertions(+), 2 deletions(-)
Index: edk2-edk2-stable201911/SecurityPkg/Tcg/TcgPei/TcgPei.c
===================================================================
--- edk2-edk2-stable201911.orig/SecurityPkg/Tcg/TcgPei/TcgPei.c
+++ edk2-edk2-stable201911/SecurityPkg/Tcg/TcgPei/TcgPei.c
@@ -21,6 +21,7 @@ SPDX-License-Identifier: BSD-2-Clause-Pa
#include <Guid/TcgEventHob.h>
#include <Guid/MeasuredFvHob.h>
#include <Guid/TpmInstance.h>
+#include <Guid/MigratedFvInfo.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
@@ -378,6 +379,10 @@ MeasureFvImage (
EFI_STATUS Status;
EFI_PLATFORM_FIRMWARE_BLOB FvBlob;
TCG_PCR_EVENT_HDR TcgEventHdr;
+ EFI_PHYSICAL_ADDRESS FvOrgBase;
+ EFI_PHYSICAL_ADDRESS FvDataBase;
+ EFI_PEI_HOB_POINTERS Hob;
+ EDKII_MIGRATED_FV_INFO *MigratedFvInfo;
//
// Check if it is in Excluded FV list
@@ -402,9 +407,29 @@ MeasureFvImage (
}
//
+ // 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);
+ }
+
+ //
// Measure and record the FV to the TPM
//
- FvBlob.BlobBase = FvBase;
+ FvBlob.BlobBase = FvOrgBase;
FvBlob.BlobLength = FvLength;
DEBUG ((DEBUG_INFO, "The FV which is measured by TcgPei starts at: 0x%x\n", FvBlob.BlobBase));
@@ -416,7 +441,7 @@ MeasureFvImage (
Status = HashLogExtendEvent (
(EFI_PEI_SERVICES **) GetPeiServicesTablePointer(),
- (UINT8*) (UINTN) FvBlob.BlobBase,
+ (UINT8*) (UINTN) FvDataBase,
(UINTN) FvBlob.BlobLength,
&TcgEventHdr,
(UINT8*) &FvBlob
Index: edk2-edk2-stable201911/SecurityPkg/Tcg/TcgPei/TcgPei.inf
===================================================================
--- edk2-edk2-stable201911.orig/SecurityPkg/Tcg/TcgPei/TcgPei.inf
+++ edk2-edk2-stable201911/SecurityPkg/Tcg/TcgPei/TcgPei.inf
@@ -58,6 +58,7 @@
gTpmErrorHobGuid ## SOMETIMES_PRODUCES ## HOB
gMeasuredFvHobGuid ## PRODUCES ## HOB
gEfiTpmDeviceInstanceTpm12Guid ## PRODUCES ## GUID # TPM device identifier
+ gEdkiiMigratedFvInfoGuid ## SOMETIMES_CONSUMES ## HOB
[Ppis]
gPeiLockPhysicalPresencePpiGuid ## SOMETIMES_CONSUMES ## NOTIFY
