Issue #22995: Default implementation of __reduce__ and __reduce_ex__ now

rejects builtin types with not defined __new__. Added tests for non-pickleable types.

Issue #22995: Default implementation of reduce and __reduce_ex__ now
rejects builtin types with not defined __new__. Added tests for non-pickleable types.
d7a44155 · Serhiy Storchaka · a9dcdabc · d7a44155 · d7a44155 · d7a44155
Commit d7a44155 authored Nov 12, 2015 by Serhiy Storchaka
6 changed files
--- a/Lib/test/test_dictviews.py
+++ b/Lib/test/test_dictviews.py
+import copy
+import pickle
 import unittest
 from test import support

@@ -198,6 +200,22 @@ class DictSetTest(unittest.TestCase):
        d[42] = d.values()
        self.assertRaises(RuntimeError, repr, d)

+    def test_copy(self):
+        d = {1: 10, "a": "ABC"}
+        self.assertRaises(TypeError, copy.copy, d.keys())
+        self.assertRaises(TypeError, copy.copy, d.values())
+        self.assertRaises(TypeError, copy.copy, d.items())
+
+    def test_pickle(self):
+        d = {1: 10, "a": "ABC"}
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            self.assertRaises((TypeError, pickle.PicklingError),
+                pickle.dumps, d.keys(), proto)
+            self.assertRaises((TypeError, pickle.PicklingError),
+                pickle.dumps, d.values(), proto)
+            self.assertRaises((TypeError, pickle.PicklingError),
+                pickle.dumps, d.items(), proto)
+

 def test_main():
    support.run_unittest(DictSetTest)

--- a/Lib/test/test_generators.py
+++ b/Lib/test/test_generators.py
+import copy
 import gc
+import pickle
 import sys
 import unittest
 import weakref
@@ -70,6 +72,24 @@ class FinalizationTest(unittest.TestCase):
            self.assertEqual(cm.exception.value, 2)


+class GeneratorTest(unittest.TestCase):
+
+    def test_copy(self):
+        def f():
+            yield 1
+        g = f()
+        with self.assertRaises(TypeError):
+            copy.copy(g)
+
+    def test_pickle(self):
+        def f():
+            yield 1
+        g = f()
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises((TypeError, pickle.PicklingError)):
+                pickle.dumps(g, proto)
+
+
 class ExceptionTest(unittest.TestCase):
    # Tests for the issue #23353: check that the currently handled exception
    # is correctly saved/restored in PyEval_EvalFrameEx().

--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -5,6 +5,7 @@
 # For this purpose, the module-level "ET" symbol is temporarily
 # monkey-patched when running the "test_xml_etree_c" test suite.

+import copy
 import html
 import io
 import operator
@@ -2082,6 +2083,19 @@ class ElementIterTest(unittest.TestCase):
        self.assertEqual(self._ilist(doc), all_tags)
        self.assertEqual(self._ilist(doc, '*'), all_tags)

+    def test_copy(self):
+        a = ET.Element('a')
+        it = a.iter()
+        with self.assertRaises(TypeError):
+            copy.copy(it)
+
+    def test_pickle(self):
+        a = ET.Element('a')
+        it = a.iter()
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises((TypeError, pickle.PicklingError)):
+                pickle.dumps(it, proto)
+

 class TreeBuilderTest(unittest.TestCase):
    sample1 = ('<!DOCTYPE html PUBLIC'

--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
 import unittest
 from test import support
 import binascii
+import pickle
 import random
 import sys
 from test.support import bigmemtest, _1G, _4G
@@ -600,6 +601,16 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
        d.flush()
        self.assertRaises(ValueError, d.copy)

+    def test_compresspickle(self):
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises((TypeError, pickle.PicklingError)):
+                pickle.dumps(zlib.compressobj(zlib.Z_BEST_COMPRESSION), proto)
+
+    def test_decompresspickle(self):
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises((TypeError, pickle.PicklingError)):
+                pickle.dumps(zlib.decompressobj(), proto)
+
    # Memory use of the following functions takes into account overallocation

    @bigmemtest(size=_1G + 1024 * 1024, memuse=3)

--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@ Release date: tba
 Core and Builtins
 -----------------

+- Issue #22995: Default implementation of __reduce__ and __reduce_ex__ now
+  rejects builtin types with not defined __new__.
+
 - Issue #24802: Avoid buffer overreads when int(), float(), compile(), exec()
  and eval() are passed bytes-like objects.  These objects are not
  necessarily terminated by a null byte, but the functions assumed they were.

--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -3980,6 +3980,12 @@ reduce_4(PyObject *obj)
    PyObject *result;
    _Py_IDENTIFIER(__newobj_ex__);

+    if (Py_TYPE(obj)->tp_new == NULL) {
+        PyErr_Format(PyExc_TypeError,
+                     "can't pickle %s objects",
+                     Py_TYPE(obj)->tp_name);
+        return NULL;
+    }
    if (_PyObject_GetNewArguments(obj, &args, &kwargs) < 0) {
        return NULL;
    }
@@ -4046,6 +4052,12 @@ reduce_2(PyObject *obj)
    Py_ssize_t i, n;
    _Py_IDENTIFIER(__newobj__);

+    if (Py_TYPE(obj)->tp_new == NULL) {
+        PyErr_Format(PyExc_TypeError,
+                     "can't pickle %s objects",
+                     Py_TYPE(obj)->tp_name);
+        return NULL;
+    }
    if (_PyObject_GetNewArguments(obj, &args, &kwargs) < 0) {
        return NULL;
    }