diff contrib/fuzz/fm1readmarkers.cc @ 41024:6a951f535fee

fuzz: new fuzzer for parsers.fm1readmarkers

Differential Revision: https://phab.mercurial-scm.org/D5465

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/fuzz/fm1readmarkers.cc	Thu Dec 20 01:22:58 2018 -0500
@@ -0,0 +1,60 @@
+#include <Python.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "pyutil.h"
+
+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 fm1readmarkers
+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))
+    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.
+}
+}