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1 #include <Python.h> |
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2 #include <assert.h> |
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3 #include <stdlib.h> |
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4 #include <unistd.h> |
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5 |
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6 #include <string> |
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7 |
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8 extern "C" { |
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9 |
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10 /* TODO: use Python 3 for this fuzzing? */ |
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11 PyMODINIT_FUNC initparsers(void); |
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12 |
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13 static char cpypath[8192] = "\0"; |
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14 |
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15 extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) |
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16 { |
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17 const std::string subdir = "/sanpy/lib/python2.7"; |
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18 /* HACK ALERT: we need a full Python installation built without |
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19 pymalloc and with ASAN, so we dump one in |
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20 $OUT/sanpy/lib/python2.7. This helps us wire that up. */ |
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21 std::string selfpath(*argv[0]); |
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22 std::string pypath; |
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23 auto pos = selfpath.rfind("/"); |
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24 if (pos == std::string::npos) { |
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25 char wd[8192]; |
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26 getcwd(wd, 8192); |
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27 pypath = std::string(wd) + subdir; |
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28 } else { |
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29 pypath = selfpath.substr(0, pos) + subdir; |
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30 } |
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31 strncpy(cpypath, pypath.c_str(), pypath.size()); |
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32 setenv("PYTHONPATH", cpypath, 1); |
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33 Py_SetPythonHome(cpypath); |
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34 return 0; |
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35 } |
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36 |
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37 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) |
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38 { |
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39 Py_InitializeEx(0); |
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40 initparsers(); |
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41 PyObject *mtext = |
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42 PyBytes_FromStringAndSize((const char *)Data, (Py_ssize_t)Size); |
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43 PyObject *mainmod = PyImport_AddModule("__main__"); |
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44 PyObject *globals = PyModule_GetDict(mainmod); |
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45 PyObject *locals = PyDict_New(); |
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46 PyDict_SetItemString(locals, "mdata", mtext); |
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47 PyCodeObject *code = |
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48 (PyCodeObject *)Py_CompileString(R"py( |
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49 from parsers import lazymanifest |
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50 lm = lazymanifest(mdata) |
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51 try: |
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52 # iterate the whole thing, which causes the code to fully parse |
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53 # every line in the manifest |
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54 list(lm.iterentries()) |
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55 lm[b'xyzzy'] = (b'\0' * 20, 'x') |
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56 # do an insert, text should change |
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57 assert lm.text() != mdata, "insert should change text and didn't: %r %r" % (lm.text(), mdata) |
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58 del lm[b'xyzzy'] |
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59 # should be back to the same |
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60 assert lm.text() == mdata, "delete should have restored text but didn't: %r %r" % (lm.text(), mdata) |
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61 except Exception as e: |
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62 pass |
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63 # uncomment this print if you're editing this Python code |
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64 # to debug failures. |
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65 # print e |
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66 )py", |
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67 "fuzzer", Py_file_input); |
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68 PyEval_EvalCode(code, globals, locals); |
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69 Py_DECREF(code); |
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70 Py_DECREF(locals); |
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71 Py_DECREF(mtext); |
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72 Py_Finalize(); |
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73 return 0; // Non-zero return values are reserved for future use. |
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74 } |
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75 } |