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MdeModulePkg/DxeIplPeim: implement non-exec stack for ARM/AARCH64

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Mark the DXE stack region as non-executable right before handing
off to the DXE core, by invoking the appropriate ArmLib function.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Feng Tian <Feng.Tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18588 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
2015-10-08 18:52:25 +00:00
committed by abiesheuvel
parent 4d9a4f62cf
commit c82b808749
2 changed files with 15 additions and 0 deletions
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7
MdeModulePkg/Core/DxeIplPeim/Arm/DxeLoadFunc.c
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@@ -16,6 +16,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include "DxeIpl.h"
#include <Library/ArmLib.h>
/**
Transfers control to DxeCore.
@@ -43,6 +45,11 @@ HandOffToDxeCore (
BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
ASSERT (BaseOfStack != NULL);
if (PcdGetBool (PcdSetNxForStack)) {
Status = ArmSetMemoryRegionNoExec ((UINTN)BaseOfStack, STACK_SIZE);
ASSERT_EFI_ERROR (Status);
}
//
// Compute the top of the stack we were allocated. Pre-allocate a UINTN
// for safety.