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Due to the fact that HeapGuard needs CpuArchProtocol to update page attributes, the feature is normally enabled after CpuArchProtocol is installed. Since there're some drivers are loaded before CpuArchProtocl, they cannot make use HeapGuard feature to detect potential issues. This patch fixes above situation by updating the DXE core to skip the NULL check against global gCpu in the IsMemoryTypeToGuard(), and adding NULL check against gCpu in SetGuardPage() and UnsetGuardPage() to make sure that they can be called but do nothing. This will allow HeapGuard to record all guarded memory without setting the related Guard pages to not- present. Once the CpuArchProtocol is installed, a protocol notify will be called to complete the work of setting Guard pages to not-present. Please note that above changes will cause a #PF in GCD code during cleanup of map entries, which is initiated by CpuDxe driver to update real mtrr and paging attributes back to GCD. During that time, CpuDxe doesn't allow GCD to update memory attributes and then any Guard page cannot be unset. As a result, this will prevent Guarded memory from freeing during memory map cleanup. The solution is to avoid allocating guarded memory as memory map entries in GCD code. It's done by setting global mOnGuarding to TRUE before memory allocation and setting it back to FALSE afterwards in GCD function CoreAllocateGcdMapEntry(). Cc: Star Zeng <star.zeng@intel.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.