[Review] PyRTFuzz: Detecting Bugs in Python Runtimes via Two-Level Collaborative Fuzzing

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The paper proposes a new approach to Python fuzzing, called PyRTFuzz.

PyRTFuzz divides the fuzzing process into two levels:

1. the generation-based level: generate the python applications.
2. the mutation-based level: apply mutation-based fuzzing to test the generated python applications.

Background:

Three existing problems for Python fuzzing:

1. testing the Python runtime requires testing both the interpreter core and the language’s runtime libraries.
2. diverse and valid(syntactically and semantically correct) Python applications are needed.
3. data types are not available in Python, so type-aware input generation is difficult.