Re: [edk2-devel] [patch v2 2/5] MdeModulePkg/DxeCapsuleLibFmp: Unload image on EFI_SECURITY_VIOLATION

["Wu, Hao A" <hao.a.wu@intel.com>]

> -----Original Message-----
> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> Dandan Bi
> Sent: Wednesday, September 18, 2019 11:06 AM
> To: devel@edk2.groups.io
> Cc: Wang, Jian J; Wu, Hao A; Gao, Liming; Laszlo Ersek
> Subject: [edk2-devel] [patch v2 2/5] MdeModulePkg/DxeCapsuleLibFmp:
> Unload image on EFI_SECURITY_VIOLATION
> 
> For the LoadImage() boot service, with EFI_SECURITY_VIOLATION retval,
> the Image was loaded and an ImageHandle was created with a valid
> EFI_LOADED_IMAGE_PROTOCOL, but the image can not be started right now.
> This follows UEFI Spec.
> 
> But if the caller of LoadImage() doesn't have the option to defer
> the execution of an image, we can not treat EFI_SECURITY_VIOLATION
> like any other LoadImage() error, we should unload image for the
> EFI_SECURITY_VIOLATION to avoid resource leak.
> 
> This patch is to do error handling for EFI_SECURITY_VIOLATION explicitly
> for the callers in DxeCapsuleLibFmp which don't have the policy to defer
> the execution of the image.
> 
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Hao A Wu <hao.a.wu@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1992
> Signed-off-by: Dandan Bi <dandan.bi@intel.com>
> ---
>  MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> b/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> index 95aa9de087..5dda561a04 100644
> --- a/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> +++ b/MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c
> @@ -1028,10 +1028,19 @@ StartFmpImage (
>                    ImageSize,
>                    &ImageHandle
>                    );
>    DEBUG((DEBUG_INFO, "FmpCapsule: LoadImage - %r\n", Status));
>    if (EFI_ERROR(Status)) {
> +    //
> +    // With EFI_SECURITY_VIOLATION retval, the Image was loaded and an
> ImageHandle was created
> +    // with a valid EFI_LOADED_IMAGE_PROTOCOL, but the image can not be
> started right now.
> +    // If the caller doesn't have the option to defer the execution of an
> image, we should
> +    // unload image for the EFI_SECURITY_VIOLATION to avoid resource leak.
> +    //
> +    if (Status == EFI_SECURITY_VIOLATION) {
> +      gBS->UnloadImage (ImageHandle);
> +    }


Reviewed-by: Hao A Wu <hao.a.wu@intel.com>

Best Regards,
Hao Wu


>      FreePool(DriverDevicePath);
>      return Status;
>    }
> 
>    DEBUG((DEBUG_INFO, "FmpCapsule: StartImage ...\n"));
> --
> 2.18.0.windows.1
> 
> 
>