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Tip revision: 90a6785f6328bd27d307ce20202d6b34aa0cc10b authored by Ned Deily on 05 December 2017, 08:27:19 UTC
Bump to 3.7.0a3
Bump to 3.7.0a3
Tip revision: 90a6785
README.rst
Fuzz Tests for CPython
======================
These fuzz tests are designed to be included in Google's `oss-fuzz`_ project.
oss-fuzz works against a library exposing a function of the form
``int LLVMFuzzerTestOneInput(const uint8_t* data, size_t length)``. We provide
that library (``fuzzer.c``), and include a ``_fuzz`` module for testing with
some toy values -- no fuzzing occurs in Python's test suite.
oss-fuzz will regularly pull from CPython, discover all the tests in
``fuzz_tests.txt``, and run them -- so adding a new test here means it will
automatically be run in oss-fuzz, while also being smoke-tested as part of
CPython's test suite.
Adding a new fuzz test
----------------------
Add the test name on a new line in ``fuzz_tests.txt``.
In ``fuzzer.c``, add a function to be run::
int $test_name (const char* data, size_t size) {
...
return 0;
}
And invoke it from ``LLVMFuzzerTestOneInput``::
#if _Py_FUZZ_YES(fuzz_builtin_float)
rv |= _run_fuzz(data, size, fuzz_builtin_float);
#endif
``LLVMFuzzerTestOneInput`` will run in oss-fuzz, with each test in
``fuzz_tests.txt`` run separately.
What makes a good fuzz test
---------------------------
Libraries written in C that might handle untrusted data are worthwhile. The
more complex the logic (e.g. parsing), the more likely this is to be a useful
fuzz test. See the existing examples for reference, and refer to the
`oss-fuzz`_ docs.
.. _oss-fuzz: https://github.com/google/oss-fuzz