From: Star Zeng <star.zeng@intel.com>
Date: Thu, 21 Dec 2017 02:57:04 +0000 (+0800)
Subject: IntelSiliconPkg MicrocodeUpdateDxe: TotalSize must be multiples of 1KB
X-Git-Tag: edk2-stable201903~2529
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=1db271df76507fcdd1755ec54087cd908fd05a58

IntelSiliconPkg MicrocodeUpdateDxe: TotalSize must be multiples of 1KB

TotalSize must be multiples of 1024 bytes (1 KBytes) according to SDM.

Also enhance the debug message for DataSize that must be
multiples of DWORDs.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
---

diff --git a/IntelSiliconPkg/Feature/Capsule/MicrocodeUpdateDxe/MicrocodeUpdate.c b/IntelSiliconPkg/Feature/Capsule/MicrocodeUpdateDxe/MicrocodeUpdate.c
index b99221c969..65729e30a0 100644
--- a/IntelSiliconPkg/Feature/Capsule/MicrocodeUpdateDxe/MicrocodeUpdate.c
+++ b/IntelSiliconPkg/Feature/Capsule/MicrocodeUpdateDxe/MicrocodeUpdate.c
@@ -8,7 +8,7 @@
 
   MicrocodeWrite() and VerifyMicrocode() will receive untrusted input and do basic validation.
 
-  Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -421,7 +421,7 @@ VerifyMicrocode (
     return EFI_INCOMPATIBLE_VERSION;
   }
   //
-  // Check Size
+  // Check TotalSize
   //
   if (MicrocodeEntryPoint->DataSize == 0) {
     TotalSize = 2048;
@@ -436,6 +436,14 @@ VerifyMicrocode (
     }
     return EFI_VOLUME_CORRUPTED;
   }
+  if ((TotalSize & (SIZE_1KB - 1)) != 0) {
+    DEBUG((DEBUG_ERROR, "VerifyMicrocode - TotalSize is not multiples of 1024 bytes (1 KBytes)\n"));
+    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
+    if (AbortReason != NULL) {
+      *AbortReason = AllocateCopyPool(sizeof(L"InvalidTotalSize"), L"InvalidTotalSize");
+    }
+    return EFI_VOLUME_CORRUPTED;
+  }
   if (TotalSize != ImageSize) {
     DEBUG((DEBUG_ERROR, "VerifyMicrocode - fail on TotalSize\n"));
     *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
@@ -445,7 +453,7 @@ VerifyMicrocode (
     return EFI_VOLUME_CORRUPTED;
   }
   //
-  // Check CheckSum32
+  // Check DataSize
   //
   if (MicrocodeEntryPoint->DataSize == 0) {
     DataSize = 2048 - sizeof(CPU_MICROCODE_HEADER);
@@ -461,13 +469,16 @@ VerifyMicrocode (
     return EFI_VOLUME_CORRUPTED;
   }
   if ((DataSize & 0x3) != 0) {
-    DEBUG((DEBUG_ERROR, "VerifyMicrocode - DataSize not aligned\n"));
+    DEBUG((DEBUG_ERROR, "VerifyMicrocode - DataSize is not multiples of DWORDs\n"));
     *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
     if (AbortReason != NULL) {
       *AbortReason = AllocateCopyPool(sizeof(L"InvalidDataSize"), L"InvalidDataSize");
     }
     return EFI_VOLUME_CORRUPTED;
   }
+  //
+  // Check CheckSum32
+  //
   CheckSum32 = CalculateSum32((UINT32 *)MicrocodeEntryPoint, DataSize + sizeof(CPU_MICROCODE_HEADER));
   if (CheckSum32 != 0) {
     DEBUG((DEBUG_ERROR, "VerifyMicrocode - fail on CheckSum32\n"));