Mercurial > hg
view contrib/fuzz/fncache.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 | b37dd26935ee |
children |
line wrap: on
line source
#include <Python.h> #include <assert.h> #include <stdlib.h> #include <unistd.h> #include "pyutil.h" #include <iostream> #include <string> extern "C" { static PYCODETYPE *code; extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) { contrib::initpy(*argv[0]); code = (PYCODETYPE *)Py_CompileString(R"py( try: for fn in ( parsers.isasciistr, parsers.asciilower, parsers.asciiupper, parsers.encodedir, parsers.pathencode, parsers.lowerencode, ): try: fn(data) except UnicodeDecodeError: pass # some functions emit this exception except AttributeError: # pathencode needs hashlib, which fails to import because the time # module fails to import. We should try and fix that some day, but # for now we at least get coverage on non-hashencoded codepaths. if fn != pathencode: raise # uncomment this for debugging exceptions # except Exception as e: # raise Exception('%r: %r' % (fn, e)) 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); if (!code) { std::cerr << "failed to compile Python code!" << std::endl; } return 0; } int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { PyObject *mtext = PyBytes_FromStringAndSize((const char *)Data, (Py_ssize_t)Size); PyObject *locals = PyDict_New(); PyDict_SetItemString(locals, "data", mtext); PyObject *res = PyEval_EvalCode(code, contrib::pyglobals(), locals); if (!res) { PyErr_Print(); } Py_XDECREF(res); Py_DECREF(locals); Py_DECREF(mtext); return 0; // Non-zero return values are reserved for future use. } }