MdeModulePkg/DxeCore: Add UEFI image protection.

If the UEFI image is page aligned, the image code section is set to read
only and the image data section is set to non-executable.

1) This policy is applied for all UEFI image including boot service driver,
runtime driver or application.
2) This policy is applied only if the UEFI image meets the page alignment
requirement.
3) This policy is applied only if the Source UEFI image matches the
PcdImageProtectionPolicy definition.
4) This policy is not applied to the non-PE image region.

The DxeCore calls CpuArchProtocol->SetMemoryAttributes() to protect
the image. If the CpuArch protocol is not installed yet, the DxeCore
enqueues the protection request. Once the CpuArch is installed, the
DxeCore dequeues the protection request and applies policy.

Once the image is unloaded, the protection is removed automatically.

The UEFI runtime image protection is teared down at ExitBootServices(),
the runtime image code relocation need write code segment at
SetVirtualAddressMap(). We cannot assume OS/Loader has taken over
page table at that time.

NOTE: It is per-requisite that code section and data section
should not be not merged. That is same criteria for SMM/runtime driver.

We are not able to detect during BIOS boot, because
we can only get LINK warning below:
"LINK : warning LNK4254: section '.data' (C0000040) merged into
'.text' (60000020) with different attributes"
But final attribute in PE code section is same.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/MdeModulePkg/Core/Dxe/Image/Image.c b/MdeModulePkg/Core/Dxe/Image/Image.c
index 4a8a16de0a..652da8bf10 100644
--- a/MdeModulePkg/Core/Dxe/Image/Image.c
+++ b/MdeModulePkg/Core/Dxe/Image/Image.c
@@ -1,7 +1,7 @@
 /** @file

   Core image handling services to load and unload PeImage.

 

-Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -203,6 +203,8 @@ CoreInitializeImageServices (
                );

   }

 

+  ProtectUefiImage (&Image->Info, Image->LoadedImageDevicePath);

+

   return Status;

 }

 

@@ -862,6 +864,8 @@ CoreUnloadAndCloseImage (
     UnregisterMemoryProfileImage (Image);

   }

 

+  UnprotectUefiImage (&Image->Info, Image->LoadedImageDevicePath);

+

   if (Image->Ebc != NULL) {

     //

     // If EBC protocol exists we must perform cleanups for this image.

@@ -1341,6 +1345,7 @@ CoreLoadImageCommon (
       goto Done;

     }

   }

+  ProtectUefiImage (&Image->Info, Image->LoadedImageDevicePath);

 

   //

   // Success.  Return the image handle