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fix(fuzz): reject documented Atheris input errors - #1190
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gaborbernat wants to merge 3 commits into
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gaborbernat wants to merge 3 commits into
gaborbernat wants to merge 3 commits into
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Atheris discards Python callback return values. Preload one runtime ELF that forwards documented errors as native rejections and resets that state for the next input. Preserve unexpected exceptions and optional custom mutations. Validate qualified callback ownership before loading Atheris. Concrete whole-API targets remain follow-up work for tox-dev#1014.
gaborbernat
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October 7, 2026 00:09
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Atheris ignores Python callback return values, so returning
-1cannot exclude inputs that raise documented API errors. Its pinned callback implementation returns zero after invoking Python. The native bridge forwards the documented rejection result to libFuzzer and resets that state before each input.The bridge links the released Atheris 3.1.0 runtime archive into one preloaded shared library, following Atheris's external-runtime requirements. It forwards optional custom mutations and preserves unexpected exceptions. Qualified export validation rejects duplicate and missing callback ownership before fuzzing starts.
Refs #1014. This slice supplies the runtime and ownership-validation mechanism. The concrete 209-export callback inventory, protected input layout and incremental target contracts remain separate acceptance work.