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Block usage of default interfaces feature in COM scenarios #23970

merged 6 commits into from Apr 19, 2019


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@AaronRobinsonMSFT AaronRobinsonMSFT commented Apr 13, 2019

Block usage of default interfaces within a COM scenario. This accomplished by validating any interface that is being passed into the COM world only contains abstract methods.


  • Validate activation as an IUnknown
  • Validate manual activation via IClassFactory
  • Validate activation failing as an interface containing non-abstract methods
  • Validate activation from an interface with all abstract methods but class does implement an interface that contains non-abstract methods
  • Validate QueryInterface() fails when requesting an interface with non-abstract methods

Fixes #15683

cc @MichalStrehovsky @davidwrighton @jkoritzinsky @jeffschwMSFT

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@davidwrighton davidwrighton left a comment

Changes to the type system look good. Changes to interop look fine to my somewhat unpracticed eye.

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@AaronRobinsonMSFT AaronRobinsonMSFT commented Apr 18, 2019

@davidwrighton et al Also note that I ran all COM tests through GCStress and verified no issues and manually confirmed no memory leaks during COM object activation.

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@AaronRobinsonMSFT AaronRobinsonMSFT commented Apr 19, 2019

@dotnet-bot test Ubuntu arm Cross Checked crossgen_comparison Build and Test please
@dotnet-bot test Ubuntu arm Cross Release crossgen_comparison Build and Test please

@AaronRobinsonMSFT AaronRobinsonMSFT merged commit df6b6f6 into dotnet:master Apr 19, 2019
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@AaronRobinsonMSFT AaronRobinsonMSFT deleted the coreclr_15683 branch Apr 19, 2019
picenka21 pushed a commit to picenka21/runtime that referenced this issue Feb 18, 2022

* Block default interface usage in COM scenarios

Add additional test cases and move some CCW functions to a more
consolidated layout.

Commit migrated from dotnet/coreclr@df6b6f6
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