Mercurial > hg
view contrib/fuzz/fm1readmarkers.cc @ 43859:8766728dbce6
fuzz: add support for fuzzing under either Python 2 or 3
This was more of a hairball than I hoped, but it appears to work. The hg-py3
branch of my oss-fuzz fork on github has the remaining changes to switch us to
Python 3, but we may as well retain Python 2 fuzzing support for at least a
little while.
Differential Revision: https://phab.mercurial-scm.org/D7592
author | Augie Fackler <augie@google.com> |
---|---|
date | Mon, 09 Dec 2019 22:20:35 -0500 |
parents | 6a951f535fee |
children |
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#include <Python.h> #include <assert.h> #include <stdlib.h> #include <unistd.h> #include <string> #include "pyutil.h" extern "C" { static PYCODETYPE *code; extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) { contrib::initpy(*argv[0]); code = (PYCODETYPE *)Py_CompileString(R"py( def maybeint(s, default): try: return int(s) except ValueError: return default try: parts = data.split('\0', 2) if len(parts) == 3: offset, stop, data = parts elif len(parts) == 2: stop, data = parts offset = 0 else: offset = stop = 0 offset, stop = maybeint(offset, 0), maybeint(stop, len(data)) parsers.fm1readmarkers(data, offset, stop) except Exception as e: pass # uncomment this print if you're editing this Python code # to debug failures. # print e )py", "fuzzer", Py_file_input); return 0; } int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { PyObject *text = PyBytes_FromStringAndSize((const char *)Data, (Py_ssize_t)Size); PyObject *locals = PyDict_New(); PyDict_SetItemString(locals, "data", text); PyObject *res = PyEval_EvalCode(code, contrib::pyglobals(), locals); if (!res) { PyErr_Print(); } Py_XDECREF(res); Py_DECREF(locals); Py_DECREF(text); return 0; // Non-zero return values are reserved for future use. } }