Re: [PATCH] DxeMain: Fix the bug that StackGuard is not enabled

["Wang, Jian J" <jian.j.wang@intel.com>]

Reviewed-by: Jian J Wang <jian.j.wang@intel.com>

Regards,
Jian

> -----Original Message-----
> From: Ni, Ray <ray.ni@intel.com>
> Sent: Friday, June 10, 2022 4:50 PM
> To: devel@edk2.groups.io
> Cc: Wang, Jian J <jian.j.wang@intel.com>; Gao, Liming
> <gaoliming@byosoft.com.cn>
> Subject: [PATCH] DxeMain: Fix the bug that StackGuard is not enabled
> 
> Commit e7abb94d1 removed InitializeCpuExceptionHandlersEx
> and updated DxeMain to call InitializeCpuExceptionHandlers
> for exception setup. But the old behavior that calls *Ex() sets
> up the stack guard as well. To match the old behavior,
> the patch calls InitializeSeparateExceptionStacks.
> 
> Signed-off-by: Ray Ni <ray.ni@intel.com>
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> ---
>  MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> index 83f49d7c00..0a1f3d79e2 100644
> --- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> +++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> @@ -256,6 +256,14 @@ DxeMain (
>    Status = InitializeCpuExceptionHandlers (VectorInfoList);
> 
>    ASSERT_EFI_ERROR (Status);
> 
> 
> 
> +  //
> 
> +  // Setup Stack Guard
> 
> +  //
> 
> +  if (PcdGetBool (PcdCpuStackGuard)) {
> 
> +    Status = InitializeSeparateExceptionStacks (NULL);
> 
> +    ASSERT_EFI_ERROR (Status);
> 
> +  }
> 
> +
> 
>    //
> 
>    // Initialize Debug Agent to support source level debug in DXE phase
> 
>    //
> 
> --
> 2.35.1.windows.2