Mercurial > hg
diff contrib/fuzz/dirs.cc @ 43150:7ff40418c6bf
fuzz: new fuzzer for dirs.c
This found a six-year-old bug immediately, and then I put it through a
few CPU-days of time before sending it.
Differential Revision: https://phab.mercurial-scm.org/D7031
author | Augie Fackler <augie@google.com> |
---|---|
date | Wed, 09 Oct 2019 20:48:12 -0700 |
parents | |
children | 8766728dbce6 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/contrib/fuzz/dirs.cc Wed Oct 09 20:48:12 2019 -0700 @@ -0,0 +1,56 @@ +#include <Python.h> +#include <assert.h> +#include <stdlib.h> +#include <unistd.h> + +#include "pyutil.h" + +#include <string> + +extern "C" { + +static PyCodeObject *code; + +extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) +{ + contrib::initpy(*argv[0]); + code = (PyCodeObject *)Py_CompileString(R"py( +from parsers import dirs +try: + files = mdata.split('\n') + d = dirs(files) + list(d) + 'a' in d + if files: + files[0] in d +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) +{ + // Don't allow fuzzer inputs larger than 100k, since we'll just bog + // down and not accomplish much. + if (Size > 100000) { + return 0; + } + PyObject *mtext = + PyBytes_FromStringAndSize((const char *)Data, (Py_ssize_t)Size); + PyObject *locals = PyDict_New(); + PyDict_SetItemString(locals, "mdata", 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. +} +}