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Fixed potential security issue introduced by SmramCpuNvs variable.

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Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Shifei Lu <shifeix.a.lu@intel.com>
Reviewed-by: David Wei <david.wei@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17683 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Shifei Lu
2015-06-23 07:22:23 +00:00
committed by zwei4
parent f827cd07d0
commit e0d42561a8
5 changed files with 21 additions and 19 deletions
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23
Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.c
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@@ -3,7 +3,7 @@
This driver is for ECP platforms.
Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under
@@ -27,6 +27,7 @@
#include <PiSmm.h>
#include <Library/DebugLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/BaseLib.h>
@@ -61,29 +62,15 @@ SmramSaveInfoHandler (
for input values for which it is registered.
@return None
**/
VOID
EFIAPI
**/
VOID
EFIAPI
{
EFI_STATUS Status;
UINT64 VarData[3];
UINTN VarSize;
ASSERT (DispatchContext != NULL);
ASSERT (DispatchContext->SwSmiInputValue == SMM_FROM_SMBASE_DRIVER);
if (!mLocked && IoRead8 (mSmiDataRegister) == SMM_FROM_CPU_DRIVER_SAVE_INFO) {
SmramSaveInfoHandler (
Status = gRT->GetVariable (
L"SmramCpuNvs",
&mSmramCpuNvsHeaderGuid,
IN EFI_HANDLE DispatchHandle,
IN EFI_SMM_SW_DISPATCH_CONTEXT *DispatchContext
)
{
&VarSize,
ASSERT (DispatchContext != NULL);
ASSERT (DispatchContext->SwSmiInputValue == SMM_FROM_SMBASE_DRIVER);