61 lines
1.9 KiB
Python
Executable File
61 lines
1.9 KiB
Python
Executable File
#!/usr/bin/python3
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# Copyright 2020 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""This fuzzer is an example of native extension fuzzing with coverage.
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This requires that the fuzzer be built with coverage:
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see build_install_ujson.sh.
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The fuzzer should then be executed under ASAN.
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As an example, this is the run command under the author's machine:
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LD_PRELOAD="/usr/lib/llvm-9/lib/clang/9.0.1/lib/linux/libclang_rt.asan-x86_64.so
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$(python3 -c "import atheris; print(atheris.path())")" python3
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./ujson_fuzzer.py -detect_leaks=0
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This fuzzer is provided mainly as an example for how to deal with native
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coverage.
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"""
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import sys
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import atheris
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import ujson
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def TestOneInput(input_bytes):
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fdp = atheris.FuzzedDataProvider(input_bytes)
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original = fdp.ConsumeUnicode(sys.maxsize)
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try:
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ujson_data = ujson.loads(original)
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except ValueError:
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return
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# We make sure there's no error in encoding, but we don't actually compare
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# (encoded == original) because it's not entirely preserving. For example,
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# it does not preserve whitespace.
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encoded = ujson.dumps(ujson_data)
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del encoded
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def main():
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# Since everything interesting in this fuzzer is in native code, we can
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# disable Python coverage to improve performance and reduce coverage noise.
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atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=False)
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atheris.Fuzz()
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if __name__ == "__main__":
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main()
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