From 6a3094c996da6f0d028fb42d09bca90dc2c7f653 Mon Sep 17 00:00:00 2001
From: Jian J Wang <jian.j.wang@intel.com>
Date: Mon, 15 Jan 2018 10:25:40 +0800
Subject: [PATCH] MdeModulePkg/BootScriptExecutorDxe: remove NX attr for
 FfsBuffer

If PcdDxeNxMemoryProtectionPolicy is set to enable protection for memory
of EfiReservedMemoryType, the BIOS will hang at a page fault exception
triggered by BootScriptExecutorDxe.

The root cause is that this driver will allocate memory of
EfiReservedMemoryType and relocate itself into this new memory. Since
EfiReservedMemoryType of memory is marked non-executable, re-start this
driver after relocation will cause exception. The fix is removing the NX
attribute after memory allocation.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
---
 .../BootScriptExecutorDxe.inf                      |  1 +
 .../Acpi/BootScriptExecutorDxe/ScriptExecute.c     | 14 ++++++++++++++
 .../Acpi/BootScriptExecutorDxe/ScriptExecute.h     |  1 +
 3 files changed, 16 insertions(+)

diff --git a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/BootScriptExecutorDxe.inf b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/BootScriptExecutorDxe.inf
index 29af7f55ec..aac132122c 100644
--- a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/BootScriptExecutorDxe.inf
+++ b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/BootScriptExecutorDxe.inf
@@ -68,6 +68,7 @@
   LockBoxLib
   CpuExceptionHandlerLib
   DevicePathLib
+  DxeServicesTableLib
 
 [Guids]
   gEfiBootScriptExecutorVariableGuid    ## PRODUCES ## UNDEFINED # SaveLockBox
diff --git a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.c b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.c
index 4545d6e581..263a282188 100644
--- a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.c
+++ b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.c
@@ -273,6 +273,7 @@ ReadyToLockEventNotify (
   UINTN                                         Pages;
   EFI_PHYSICAL_ADDRESS                          FfsBuffer;
   PE_COFF_LOADER_IMAGE_CONTEXT                  ImageContext;
+  EFI_GCD_MEMORY_SPACE_DESCRIPTOR               MemDesc;
 
   Status = gBS->LocateProtocol (&gEfiDxeSmmReadyToLockProtocolGuid, NULL, &Interface);
   if (EFI_ERROR (Status)) {
@@ -322,6 +323,19 @@ ReadyToLockEventNotify (
                   &FfsBuffer
                   );
   ASSERT_EFI_ERROR (Status);
+
+  //
+  // Make sure that the buffer can be used to store code.
+  //
+  Status = gDS->GetMemorySpaceDescriptor (FfsBuffer, &MemDesc);
+  if (!EFI_ERROR (Status) && (MemDesc.Attributes & EFI_MEMORY_XP) != 0) {
+    gDS->SetMemorySpaceAttributes (
+           FfsBuffer,
+           EFI_PAGES_TO_SIZE (Pages),
+           MemDesc.Attributes & (~EFI_MEMORY_XP)
+           );
+  }
+
   ImageContext.ImageAddress = (PHYSICAL_ADDRESS)(UINTN)FfsBuffer;
   //
   // Align buffer on section boundary
diff --git a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.h b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.h
index 75327569d7..94deae87e6 100644
--- a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.h
+++ b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.h
@@ -38,6 +38,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Library/LockBoxLib.h>
 #include <Library/CpuExceptionHandlerLib.h>
 #include <Library/DevicePathLib.h>
+#include <Library/DxeServicesTableLib.h>
 
 #include <Guid/AcpiS3Context.h>
 #include <Guid/BootScriptExecutorVariable.h>
-- 
2.39.2