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Bug: Projected winrt::consume_ methods will nullptr crash if the underlying QueryInterface call fails (#1442)
# Why is this change being made? The generated projection code for interfaces that the metadata declares as required for a runtimeclass assume that QueryInterface never fails. Assuming the metadata is correct in the first place, this is a valid assumption for inproc calls. However, for cross-process calls the QI can fail even if the metadata is correct and the class really does implement all of the required interfaces. It can fail with E_ACCESSDENIED and a variety of other RPC error codes. When this happens there is a nullptr crash in the generated consume method. This can be very painful to debug because the HRESULT is lost by the time it crashes. # Briefly summarize what changed This set of changes fixes the crash by detecting the QueryInterface error and throwing an exception when that occurs during one of these required casts. The try_as method was changed to capture COM error context when the QI fails. The code gen surrounding WINRT_IMPL_STUB was changed to save the result into a temporary variable and then pass it to a new check_cast_result method. check_cast_result is marked noinline so that the binary size impact of throwing exceptions is limited to a single function instead of inlining into high-volume generated code. If the cast succeeded then nothing happens. If the cast failed, returning null, then the stored COM exception is retrieved. Assuming it is available the HRESULT is pulled out of it and it is thrown. This then propagates like any other exception. Callers are free to try and catch it or let it go uncaught and crash. Now they have the choice. I also added a new file of test code that exercises this code path. The test_component IDL declares a runtimeclass that implements IStringable. And then the implementation fails to implement IStringable. When ToString is called on this object it hits the failure path. The cppwinrt code gen will not allow this to happen so I had to directly use winrt::implements. # How was this change tested? Besides the new test cases I also wrote a little console app that crashes this way. I built and ran it using the latest stable cppwinrt as well as my private new one. As expected the debugger blame is far more useful with these changes.
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-236
lines changed

9 files changed

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-236
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‎cppwinrt.sln‎

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@@ -88,6 +88,9 @@ EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fast_fwd", "fast_fwd\fast_fwd.vcxproj", "{A63B3AD1-AB7B-461E-9FFF-2447F5BCD459}"
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "scratch", "scratch\scratch.vcxproj", "{E893622C-47DE-4F83-B422-0A26711590A4}"
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ProjectSection(ProjectDependencies) = postProject
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{D613FB39-5035-4043-91E2-BAB323908AF4} = {D613FB39-5035-4043-91E2-BAB323908AF4}
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EndProjectSection
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_module_lock_none", "test\test_module_lock_none\test_module_lock_none.vcxproj", "{D48A96C2-8512-4CC3-B6E4-7CFF07ED8ED3}"
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ProjectSection(ProjectDependencies) = postProject

‎cppwinrt/code_writers.h‎

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@@ -1129,17 +1129,27 @@ namespace cppwinrt
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if (is_remove_overload(method))
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{
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// we intentionally ignore errors when unregistering event handlers to be consistent with event_revoker
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//
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// The `noexcept` versions will crash if check_cast_result throws but that is no different than previous
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// behavior where it would not check the cast result and nullptr crash. At least the exception will terminate
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// immediately while preserving the error code and local variables.
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format = R"( template <typename D%> auto consume_%<D%>::%(%) const noexcept
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{%
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WINRT_IMPL_SHIM(%)->%(%);%
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auto const& castedResult = static_cast<% const&>(static_cast<D const&>(*this));
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auto const abiType = *(abi_t<%>**)&castedResult;
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check_cast_result(abiType);
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abiType->%(%);%
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}
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)";
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}
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else
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{
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format = R"( template <typename D%> auto consume_%<D%>::%(%) const noexcept
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{%
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WINRT_VERIFY_(0, WINRT_IMPL_SHIM(%)->%(%));%
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auto const& castedResult = static_cast<% const&>(static_cast<D const&>(*this));
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auto const abiType = *(abi_t<%>**)&castedResult;
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check_cast_result(abiType);
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WINRT_VERIFY_(0, abiType->%(%));%
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}
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)";
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}
@@ -1148,7 +1158,10 @@ namespace cppwinrt
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{
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format = R"( template <typename D%> auto consume_%<D%>::%(%) const
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{%
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check_hresult(WINRT_IMPL_SHIM(%)->%(%));%
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auto const& castedResult = static_cast<% const&>(static_cast<D const&>(*this));
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auto const abiType = *(abi_t<%>**)&castedResult;
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check_cast_result(abiType);
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check_hresult(abiType->%(%));%
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}
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)";
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}
@@ -1161,6 +1174,7 @@ namespace cppwinrt
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bind<write_consume_params>(signature),
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bind<write_consume_return_type>(signature, false),
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type,
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type,
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get_abi_name(method),
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bind<write_abi_args>(signature),
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bind<write_consume_return_statement>(signature));

‎scratch/scratch.vcxproj‎

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@@ -1,5 +1,6 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup Label="ProjectConfigurations">
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<ProjectConfiguration Include="Debug|ARM">
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<Configuration>Debug</Configuration>
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</ProjectConfiguration>
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</ItemGroup>
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<PropertyGroup Label="Globals">
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<CppWinRTOptimized>true</CppWinRTOptimized>
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<CppWinRTRootNamespaceAutoMerge>true</CppWinRTRootNamespaceAutoMerge>
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<CppWinRTGenerateWindowsMetadata>true</CppWinRTGenerateWindowsMetadata>
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<MinimalCoreWin>true</MinimalCoreWin>
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<VCProjectVersion>16.0</VCProjectVersion>
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<ProjectGuid>{E893622C-47DE-4F83-B422-0A26711590A4}</ProjectGuid>
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<RootNamespace>scratch</RootNamespace>
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<ProjectName>scratch</ProjectName>
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<UseDebugLibraries>true</UseDebugLibraries>
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>true</UseDebugLibraries>
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<!-- Not using the real nuget package so override-->
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<CppWinRTPackageDir>..\_build\$(Platform)\$(Configuration)</CppWinRTPackageDir>
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<CppWinRTPackage>false</CppWinRTPackage>
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<Link>
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<SubSystem>Console</SubSystem>
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<PrecompiledHeader>Create</PrecompiledHeader>
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‎strings/base_error.h‎

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Original file line numberDiff line numberDiff line change
@@ -546,6 +546,28 @@ namespace winrt::impl
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}
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return result;
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}
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template <typename T>
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WINRT_IMPL_NOINLINE void check_cast_result(T* from WINRT_IMPL_SOURCE_LOCATION_ARGS)
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{
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if (!from)
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{
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com_ptr<impl::IRestrictedErrorInfo> restrictedError;
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if (WINRT_IMPL_GetRestrictedErrorInfo(restrictedError.put_void()) == 0)
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{
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WINRT_IMPL_SetRestrictedErrorInfo(restrictedError.get());
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int32_t code;
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impl::bstr_handle description;
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impl::bstr_handle restrictedDescription;
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impl::bstr_handle capabilitySid;
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if (restrictedError->GetErrorDetails(description.put(), &code, restrictedDescription.put(), capabilitySid.put()) == 0)
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{
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throw hresult_error(code, take_ownership_from_abi WINRT_IMPL_SOURCE_LOCATION_FORWARD);
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}
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}
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}
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}
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}
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#undef WINRT_IMPL_RETURNADDRESS

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