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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>
This commit is contained in:
Jian J Wang 2018-01-15 10:25:40 +08:00 committed by Ruiyu Ni
parent 94c0129d24
commit 6a3094c996
3 changed files with 16 additions and 0 deletions
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1
MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/BootScriptExecutorDxe.inf
View File

@ -68,6 +68,7 @@
LockBoxLib
CpuExceptionHandlerLib
DevicePathLib
DxeServicesTableLib
[Guids]
gEfiBootScriptExecutorVariableGuid ## PRODUCES ## UNDEFINED # SaveLockBox

14
MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.c
View File

@ -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

1
MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.h
View File

@ -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>