Library import 16 (#2433)

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2 files changed, 617 insertions, 0 deletions

diff --git a/contrib/tools/python3/Modules/_xxtestfuzz/_xxtestfuzz.c b/contrib/tools/python3/Modules/_xxtestfuzz/_xxtestfuzz.c
new file mode 100644
index 00000000000..e0694de6719
--- /dev/null
+++ b/contrib/tools/python3/Modules/_xxtestfuzz/_xxtestfuzz.c
@@ -0,0 +1,48 @@
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
+
+static PyObject* _fuzz_run(PyObject* self, PyObject* args) {
+    const char* buf;
+    Py_ssize_t size;
+    if (!PyArg_ParseTuple(args, "s#", &buf, &size)) {
+        return NULL;
+    }
+    int rv = LLVMFuzzerTestOneInput((const uint8_t*)buf, size);
+    if (PyErr_Occurred()) {
+        return NULL;
+    }
+    if (rv != 0) {
+        // Nonzero return codes are reserved for future use.
+        PyErr_Format(
+            PyExc_RuntimeError, "Nonzero return code from fuzzer: %d", rv);
+        return NULL;
+    }
+    Py_RETURN_NONE;
+}
+
+static PyMethodDef module_methods[] = {
+    {"run", (PyCFunction)_fuzz_run, METH_VARARGS, ""},
+    {NULL},
+};
+
+static struct PyModuleDef _fuzzmodule = {
+        PyModuleDef_HEAD_INIT,
+        "_fuzz",
+        NULL,
+        0,
+        module_methods,
+        NULL,
+        NULL,
+        NULL,
+        NULL
+};
+
+PyMODINIT_FUNC
+PyInit__xxtestfuzz(void)
+{
+    return PyModule_Create(&_fuzzmodule);
+}
diff --git a/contrib/tools/python3/Modules/_xxtestfuzz/fuzzer.c b/contrib/tools/python3/Modules/_xxtestfuzz/fuzzer.c
new file mode 100644
index 00000000000..cd97206d181
--- /dev/null
+++ b/contrib/tools/python3/Modules/_xxtestfuzz/fuzzer.c
@@ -0,0 +1,569 @@
+/* A fuzz test for CPython.
+
+  The only exposed function is LLVMFuzzerTestOneInput, which is called by
+  fuzzers and by the _fuzz module for smoke tests.
+
+  To build exactly one fuzz test, as when running in oss-fuzz etc.,
+  build with -D _Py_FUZZ_ONE and -D _Py_FUZZ_<test_name>. e.g. to build
+  LLVMFuzzerTestOneInput to only run "fuzz_builtin_float", build this file with
+      -D _Py_FUZZ_ONE -D _Py_FUZZ_fuzz_builtin_float.
+
+  See the source code for LLVMFuzzerTestOneInput for details. */
+
+#include <Python.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+/*  Fuzz PyFloat_FromString as a proxy for float(str). */
+static int fuzz_builtin_float(const char* data, size_t size) {
+    PyObject* s = PyBytes_FromStringAndSize(data, size);
+    if (s == NULL) return 0;
+    PyObject* f = PyFloat_FromString(s);
+    if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_ValueError)) {
+        PyErr_Clear();
+    }
+
+    Py_XDECREF(f);
+    Py_DECREF(s);
+    return 0;
+}
+
+#define MAX_INT_TEST_SIZE 0x10000
+
+/* Fuzz PyLong_FromUnicodeObject as a proxy for int(str). */
+static int fuzz_builtin_int(const char* data, size_t size) {
+    /* Ignore test cases with very long ints to avoid timeouts
+       int("9" * 1000000) is not a very interesting test caase */
+    if (size > MAX_INT_TEST_SIZE) {
+        return 0;
+    }
+    /* Pick a random valid base. (When the fuzzed function takes extra
+       parameters, it's somewhat normal to hash the input to generate those
+       parameters. We want to exercise all code paths, so we do so here.) */
+    int base = _Py_HashBytes(data, size) % 37;
+    if (base == 1) {
+        // 1 is the only number between 0 and 36 that is not a valid base.
+        base = 0;
+    }
+    if (base == -1) {
+        return 0;  // An error occurred, bail early.
+    }
+    if (base < 0) {
+        base = -base;
+    }
+
+    PyObject* s = PyUnicode_FromStringAndSize(data, size);
+    if (s == NULL) {
+        if (PyErr_ExceptionMatches(PyExc_UnicodeDecodeError)) {
+            PyErr_Clear();
+        }
+        return 0;
+    }
+    PyObject* l = PyLong_FromUnicodeObject(s, base);
+    if (l == NULL && PyErr_ExceptionMatches(PyExc_ValueError)) {
+        PyErr_Clear();
+    }
+    PyErr_Clear();
+    Py_XDECREF(l);
+    Py_DECREF(s);
+    return 0;
+}
+
+/* Fuzz PyUnicode_FromStringAndSize as a proxy for unicode(str). */
+static int fuzz_builtin_unicode(const char* data, size_t size) {
+    PyObject* s = PyUnicode_FromStringAndSize(data, size);
+    if (s == NULL && PyErr_ExceptionMatches(PyExc_UnicodeDecodeError)) {
+        PyErr_Clear();
+    }
+    Py_XDECREF(s);
+    return 0;
+}
+
+
+PyObject* struct_unpack_method = NULL;
+PyObject* struct_error = NULL;
+/* Called by LLVMFuzzerTestOneInput for initialization */
+static int init_struct_unpack(void) {
+    /* Import struct.unpack */
+    PyObject* struct_module = PyImport_ImportModule("struct");
+    if (struct_module == NULL) {
+        return 0;
+    }
+    struct_error = PyObject_GetAttrString(struct_module, "error");
+    if (struct_error == NULL) {
+        return 0;
+    }
+    struct_unpack_method = PyObject_GetAttrString(struct_module, "unpack");
+    return struct_unpack_method != NULL;
+}
+/* Fuzz struct.unpack(x, y) */
+static int fuzz_struct_unpack(const char* data, size_t size) {
+    /* Everything up to the first null byte is considered the
+       format. Everything after is the buffer */
+    const char* first_null = memchr(data, '\0', size);
+    if (first_null == NULL) {
+        return 0;
+    }
+
+    size_t format_length = first_null - data;
+    size_t buffer_length = size - format_length - 1;
+
+    PyObject* pattern = PyBytes_FromStringAndSize(data, format_length);
+    if (pattern == NULL) {
+        return 0;
+    }
+    PyObject* buffer = PyBytes_FromStringAndSize(first_null + 1, buffer_length);
+    if (buffer == NULL) {
+        Py_DECREF(pattern);
+        return 0;
+    }
+
+    PyObject* unpacked = PyObject_CallFunctionObjArgs(
+        struct_unpack_method, pattern, buffer, NULL);
+    /* Ignore any overflow errors, these are easily triggered accidentally */
+    if (unpacked == NULL && PyErr_ExceptionMatches(PyExc_OverflowError)) {
+        PyErr_Clear();
+    }
+    /* The pascal format string will throw a negative size when passing 0
+       like: struct.unpack('0p', b'') */
+    if (unpacked == NULL && PyErr_ExceptionMatches(PyExc_SystemError)) {
+        PyErr_Clear();
+    }
+    /* Ignore any struct.error exceptions, these can be caused by invalid
+       formats or incomplete buffers both of which are common. */
+    if (unpacked == NULL && PyErr_ExceptionMatches(struct_error)) {
+        PyErr_Clear();
+    }
+
+    Py_XDECREF(unpacked);
+    Py_DECREF(pattern);
+    Py_DECREF(buffer);
+    return 0;
+}
+
+
+#define MAX_JSON_TEST_SIZE 0x100000
+
+PyObject* json_loads_method = NULL;
+/* Called by LLVMFuzzerTestOneInput for initialization */
+static int init_json_loads(void) {
+    /* Import json.loads */
+    PyObject* json_module = PyImport_ImportModule("json");
+    if (json_module == NULL) {
+        return 0;
+    }
+    json_loads_method = PyObject_GetAttrString(json_module, "loads");
+    return json_loads_method != NULL;
+}
+/* Fuzz json.loads(x) */
+static int fuzz_json_loads(const char* data, size_t size) {
+    /* Since python supports arbitrarily large ints in JSON,
+       long inputs can lead to timeouts on boring inputs like
+       `json.loads("9" * 100000)` */
+    if (size > MAX_JSON_TEST_SIZE) {
+        return 0;
+    }
+    PyObject* input_bytes = PyBytes_FromStringAndSize(data, size);
+    if (input_bytes == NULL) {
+        return 0;
+    }
+    PyObject* parsed = PyObject_CallOneArg(json_loads_method, input_bytes);
+    if (parsed == NULL) {
+        /* Ignore ValueError as the fuzzer will more than likely
+           generate some invalid json and values */
+        if (PyErr_ExceptionMatches(PyExc_ValueError) ||
+        /* Ignore RecursionError as the fuzzer generates long sequences of
+           arrays such as `[[[...` */
+            PyErr_ExceptionMatches(PyExc_RecursionError) ||
+        /* Ignore unicode errors, invalid byte sequences are common */
+            PyErr_ExceptionMatches(PyExc_UnicodeDecodeError)
+        ) {
+            PyErr_Clear();
+        }
+    }
+    Py_DECREF(input_bytes);
+    Py_XDECREF(parsed);
+    return 0;
+}
+
+#define MAX_RE_TEST_SIZE 0x10000
+
+PyObject* re_compile_method = NULL;
+PyObject* re_error_exception = NULL;
+int RE_FLAG_DEBUG = 0;
+/* Called by LLVMFuzzerTestOneInput for initialization */
+static int init_sre_compile(void) {
+    /* Import sre_compile.compile and sre.error */
+    PyObject* re_module = PyImport_ImportModule("re");
+    if (re_module == NULL) {
+        return 0;
+    }
+    re_compile_method = PyObject_GetAttrString(re_module, "compile");
+    if (re_compile_method == NULL) {
+        return 0;
+    }
+
+    re_error_exception = PyObject_GetAttrString(re_module, "error");
+    if (re_error_exception == NULL) {
+        return 0;
+    }
+    PyObject* debug_flag = PyObject_GetAttrString(re_module, "DEBUG");
+    if (debug_flag == NULL) {
+        return 0;
+    }
+    RE_FLAG_DEBUG = PyLong_AsLong(debug_flag);
+    return 1;
+}
+/* Fuzz re.compile(x) */
+static int fuzz_sre_compile(const char* data, size_t size) {
+    /* Ignore really long regex patterns that will timeout the fuzzer */
+    if (size > MAX_RE_TEST_SIZE) {
+        return 0;
+    }
+    /* We treat the first 2 bytes of the input as a number for the flags */
+    if (size < 2) {
+        return 0;
+    }
+    uint16_t flags = ((uint16_t*) data)[0];
+    /* We remove the SRE_FLAG_DEBUG if present. This is because it
+       prints to stdout which greatly decreases fuzzing speed */
+    flags &= ~RE_FLAG_DEBUG;
+
+    /* Pull the pattern from the remaining bytes */
+    PyObject* pattern_bytes = PyBytes_FromStringAndSize(data + 2, size - 2);
+    if (pattern_bytes == NULL) {
+        return 0;
+    }
+    PyObject* flags_obj = PyLong_FromUnsignedLong(flags);
+    if (flags_obj == NULL) {
+        Py_DECREF(pattern_bytes);
+        return 0;
+    }
+
+    /* compiled = re.compile(data[2:], data[0:2] */
+    PyObject* compiled = PyObject_CallFunctionObjArgs(
+        re_compile_method, pattern_bytes, flags_obj, NULL);
+    /* Ignore ValueError as the fuzzer will more than likely
+       generate some invalid combination of flags */
+    if (compiled == NULL && PyErr_ExceptionMatches(PyExc_ValueError)) {
+        PyErr_Clear();
+    }
+    /* Ignore some common errors thrown by sre_parse:
+       Overflow, Assertion, Recursion and Index */
+    if (compiled == NULL && (PyErr_ExceptionMatches(PyExc_OverflowError) ||
+                             PyErr_ExceptionMatches(PyExc_AssertionError) ||
+                             PyErr_ExceptionMatches(PyExc_RecursionError) ||
+                             PyErr_ExceptionMatches(PyExc_IndexError))
+    ) {
+        PyErr_Clear();
+    }
+    /* Ignore re.error */
+    if (compiled == NULL && PyErr_ExceptionMatches(re_error_exception)) {
+        PyErr_Clear();
+    }
+
+    Py_DECREF(pattern_bytes);
+    Py_DECREF(flags_obj);
+    Py_XDECREF(compiled);
+    return 0;
+}
+
+/* Some random patterns used to test re.match.
+   Be careful not to add catostraphically slow regexes here, we want to
+   exercise the matching code without causing timeouts.*/
+static const char* regex_patterns[] = {
+    ".", "^", "abc", "abc|def", "^xxx$", "\\b", "()", "[a-zA-Z0-9]",
+    "abc+", "[^A-Z]", "[x]", "(?=)", "a{z}", "a+b", "a*?", "a??", "a+?",
+    "{}", "a{,}", "{", "}", "^\\(*\\d{3}\\)*( |-)*\\d{3}( |-)*\\d{4}$",
+    "(?:a*)*", "a{1,2}?"
+};
+const size_t NUM_PATTERNS = sizeof(regex_patterns) / sizeof(regex_patterns[0]);
+PyObject** compiled_patterns = NULL;
+/* Called by LLVMFuzzerTestOneInput for initialization */
+static int init_sre_match(void) {
+    PyObject* re_module = PyImport_ImportModule("re");
+    if (re_module == NULL) {
+        return 0;
+    }
+    compiled_patterns = (PyObject**) PyMem_RawMalloc(
+        sizeof(PyObject*) * NUM_PATTERNS);
+    if (compiled_patterns == NULL) {
+        PyErr_NoMemory();
+        return 0;
+    }
+
+    /* Precompile all the regex patterns on the first run for faster fuzzing */
+    for (size_t i = 0; i < NUM_PATTERNS; i++) {
+        PyObject* compiled = PyObject_CallMethod(
+            re_module, "compile", "y", regex_patterns[i]);
+        /* Bail if any of the patterns fail to compile */
+        if (compiled == NULL) {
+            return 0;
+        }
+        compiled_patterns[i] = compiled;
+    }
+    return 1;
+}
+/* Fuzz re.match(x) */
+static int fuzz_sre_match(const char* data, size_t size) {
+    if (size < 1 || size > MAX_RE_TEST_SIZE) {
+        return 0;
+    }
+    /* Use the first byte as a uint8_t specifying the index of the
+       regex to use */
+    unsigned char idx = (unsigned char) data[0];
+    idx = idx % NUM_PATTERNS;
+
+    /* Pull the string to match from the remaining bytes */
+    PyObject* to_match = PyBytes_FromStringAndSize(data + 1, size - 1);
+    if (to_match == NULL) {
+        return 0;
+    }
+
+    PyObject* pattern = compiled_patterns[idx];
+    PyObject* match_callable = PyObject_GetAttrString(pattern, "match");
+
+    PyObject* matches = PyObject_CallOneArg(match_callable, to_match);
+
+    Py_XDECREF(matches);
+    Py_DECREF(match_callable);
+    Py_DECREF(to_match);
+    return 0;
+}
+
+#define MAX_CSV_TEST_SIZE 0x100000
+PyObject* csv_module = NULL;
+PyObject* csv_error = NULL;
+/* Called by LLVMFuzzerTestOneInput for initialization */
+static int init_csv_reader(void) {
+    /* Import csv and csv.Error */
+    csv_module = PyImport_ImportModule("csv");
+    if (csv_module == NULL) {
+        return 0;
+    }
+    csv_error = PyObject_GetAttrString(csv_module, "Error");
+    return csv_error != NULL;
+}
+/* Fuzz csv.reader([x]) */
+static int fuzz_csv_reader(const char* data, size_t size) {
+    if (size < 1 || size > MAX_CSV_TEST_SIZE) {
+        return 0;
+    }
+    /* Ignore non null-terminated strings since _csv can't handle
+       embedded nulls */
+    if (memchr(data, '\0', size) == NULL) {
+        return 0;
+    }
+
+    PyObject* s = PyUnicode_FromString(data);
+    /* Ignore exceptions until we have a valid string */
+    if (s == NULL) {
+        PyErr_Clear();
+        return 0;
+    }
+
+    /* Split on \n so we can test multiple lines */
+    PyObject* lines = PyObject_CallMethod(s, "split", "s", "\n");
+    if (lines == NULL) {
+        Py_DECREF(s);
+        return 0;
+    }
+
+    PyObject* reader = PyObject_CallMethod(csv_module, "reader", "N", lines);
+    if (reader) {
+        /* Consume all of the reader as an iterator */
+        PyObject* parsed_line;
+        while ((parsed_line = PyIter_Next(reader))) {
+            Py_DECREF(parsed_line);
+        }
+    }
+
+    /* Ignore csv.Error because we're probably going to generate
+       some bad files (embedded new-lines, unterminated quotes etc) */
+    if (PyErr_ExceptionMatches(csv_error)) {
+        PyErr_Clear();
+    }
+
+    Py_XDECREF(reader);
+    Py_DECREF(s);
+    return 0;
+}
+
+#define MAX_AST_LITERAL_EVAL_TEST_SIZE 0x100000
+PyObject* ast_literal_eval_method = NULL;
+/* Called by LLVMFuzzerTestOneInput for initialization */
+static int init_ast_literal_eval(void) {
+    PyObject* ast_module = PyImport_ImportModule("ast");
+    if (ast_module == NULL) {
+        return 0;
+    }
+    ast_literal_eval_method = PyObject_GetAttrString(ast_module, "literal_eval");
+    return ast_literal_eval_method != NULL;
+}
+/* Fuzz ast.literal_eval(x) */
+static int fuzz_ast_literal_eval(const char* data, size_t size) {
+    if (size > MAX_AST_LITERAL_EVAL_TEST_SIZE) {
+        return 0;
+    }
+    /* Ignore non null-terminated strings since ast can't handle
+       embedded nulls */
+    if (memchr(data, '\0', size) == NULL) {
+        return 0;
+    }
+
+    PyObject* s = PyUnicode_FromString(data);
+    /* Ignore exceptions until we have a valid string */
+    if (s == NULL) {
+        PyErr_Clear();
+        return 0;
+    }
+
+    PyObject* literal = PyObject_CallOneArg(ast_literal_eval_method, s);
+    /* Ignore some common errors thrown by ast.literal_eval */
+    if (literal == NULL && (PyErr_ExceptionMatches(PyExc_ValueError) ||
+                            PyErr_ExceptionMatches(PyExc_TypeError) ||
+                            PyErr_ExceptionMatches(PyExc_SyntaxError) ||
+                            PyErr_ExceptionMatches(PyExc_MemoryError) ||
+                            PyErr_ExceptionMatches(PyExc_RecursionError))
+    ) {
+        PyErr_Clear();
+    }
+
+    Py_XDECREF(literal);
+    Py_DECREF(s);
+    return 0;
+}
+
+/* Run fuzzer and abort on failure. */
+static int _run_fuzz(const uint8_t *data, size_t size, int(*fuzzer)(const char* , size_t)) {
+    int rv = fuzzer((const char*) data, size);
+    if (PyErr_Occurred()) {
+        /* Fuzz tests should handle expected errors for themselves.
+           This is last-ditch check in case they didn't. */
+        PyErr_Print();
+        abort();
+    }
+    /* Someday the return value might mean something, propagate it. */
+    return rv;
+}
+
+/* CPython generates a lot of leak warnings for whatever reason. */
+int __lsan_is_turned_off(void) { return 1; }
+
+
+int LLVMFuzzerInitialize(int *argc, char ***argv) {
+    PyConfig config;
+    PyConfig_InitPythonConfig(&config);
+    config.install_signal_handlers = 0;
+    /* Raise the limit above the default allows exercising larger things
+     * now that we fall back to the _pylong module for large values. */
+    config.int_max_str_digits = 8086;
+    PyStatus status;
+    status = PyConfig_SetBytesString(&config, &config.program_name, *argv[0]);
+    if (PyStatus_Exception(status)) {
+        goto fail;
+    }
+
+    status = Py_InitializeFromConfig(&config);
+    if (PyStatus_Exception(status)) {
+        goto fail;
+    }
+    PyConfig_Clear(&config);
+
+    return 0;
+
+fail:
+    PyConfig_Clear(&config);
+    Py_ExitStatusException(status);
+}
+
+/* Fuzz test interface.
+   This returns the bitwise or of all fuzz test's return values.
+
+   All fuzz tests must return 0, as all nonzero return codes are reserved for
+   future use -- we propagate the return values for that future case.
+   (And we bitwise or when running multiple tests to verify that normally we
+   only return 0.) */
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+    assert(Py_IsInitialized());
+
+    int rv = 0;
+
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_builtin_float)
+    rv |= _run_fuzz(data, size, fuzz_builtin_float);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_builtin_int)
+    rv |= _run_fuzz(data, size, fuzz_builtin_int);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_builtin_unicode)
+    rv |= _run_fuzz(data, size, fuzz_builtin_unicode);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_struct_unpack)
+    static int STRUCT_UNPACK_INITIALIZED = 0;
+    if (!STRUCT_UNPACK_INITIALIZED && !init_struct_unpack()) {
+        PyErr_Print();
+        abort();
+    } else {
+        STRUCT_UNPACK_INITIALIZED = 1;
+    }
+    rv |= _run_fuzz(data, size, fuzz_struct_unpack);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_json_loads)
+    static int JSON_LOADS_INITIALIZED = 0;
+    if (!JSON_LOADS_INITIALIZED && !init_json_loads()) {
+        PyErr_Print();
+        abort();
+    } else {
+        JSON_LOADS_INITIALIZED = 1;
+    }
+
+    rv |= _run_fuzz(data, size, fuzz_json_loads);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_sre_compile)
+    static int SRE_COMPILE_INITIALIZED = 0;
+    if (!SRE_COMPILE_INITIALIZED && !init_sre_compile()) {
+        PyErr_Print();
+        abort();
+    } else {
+        SRE_COMPILE_INITIALIZED = 1;
+    }
+
+    if (SRE_COMPILE_INITIALIZED) {
+        rv |= _run_fuzz(data, size, fuzz_sre_compile);
+    }
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_sre_match)
+    static int SRE_MATCH_INITIALIZED = 0;
+    if (!SRE_MATCH_INITIALIZED && !init_sre_match()) {
+        PyErr_Print();
+        abort();
+    } else {
+        SRE_MATCH_INITIALIZED = 1;
+    }
+
+    rv |= _run_fuzz(data, size, fuzz_sre_match);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_csv_reader)
+    static int CSV_READER_INITIALIZED = 0;
+    if (!CSV_READER_INITIALIZED && !init_csv_reader()) {
+        PyErr_Print();
+        abort();
+    } else {
+        CSV_READER_INITIALIZED = 1;
+    }
+
+    rv |= _run_fuzz(data, size, fuzz_csv_reader);
+#endif
+#if !defined(_Py_FUZZ_ONE) || defined(_Py_FUZZ_fuzz_ast_literal_eval)
+    static int AST_LITERAL_EVAL_INITIALIZED = 0;
+    if (!AST_LITERAL_EVAL_INITIALIZED && !init_ast_literal_eval()) {
+        PyErr_Print();
+        abort();
+    } else {
+        AST_LITERAL_EVAL_INITIALIZED = 1;
+    }
+
+    rv |= _run_fuzz(data, size, fuzz_ast_literal_eval);
+#endif
+  return rv;
+}