python311/CVE-2023-52425-libexpat-2.6.0-backport.patch

---
 Lib/test/support/__init__.py |   16 ++++++++++++++--
 Lib/test/test_minidom.py     |   23 +++++++++--------------
 Lib/test/test_pyexpat.py     |   12 +++++-------
 Lib/test/test_sax.py         |   18 +++++++++---------
 Lib/test/test_xml_etree.py   |   12 ------------
 5 files changed, 37 insertions(+), 44 deletions(-)

--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -8,6 +8,7 @@ import dataclasses
 import functools
 import os
 import re
+import pyexpat
 import stat
 import sys
 import sysconfig
@@ -56,7 +57,7 @@ __all__ = [
     "run_with_tz", "PGO", "missing_compiler_executable",
     "ALWAYS_EQ", "NEVER_EQ", "LARGEST", "SMALLEST",
     "LOOPBACK_TIMEOUT", "INTERNET_TIMEOUT", "SHORT_TIMEOUT", "LONG_TIMEOUT",
-    "skip_on_s390x",
+    "skip_on_s390x", "fails_with_expat_2_6_0", "is_expat_2_6_0"
     ]
 
 
@@ -2240,6 +2241,17 @@ def copy_python_src_ignore(path, names):
         }
     return ignored
 
-#Windows doesn't have os.uname() but it doesn't support s390x.
+
+# Windows doesn't have os.uname() but it doesn't support s390x.
 skip_on_s390x = unittest.skipIf(hasattr(os, 'uname') and os.uname().machine == 's390x',
                                 'skipped on s390x')
+
+
+@functools.lru_cache
+def _is_expat_2_6_0():
+    return hasattr(pyexpat.ParserCreate(), 'SetReparseDeferralEnabled')
+is_expat_2_6_0 = _is_expat_2_6_0()
+
+fails_with_expat_2_6_0 = (unittest.expectedFailure
+                          if is_expat_2_6_0
+                          else lambda test: test)
--- a/Lib/test/test_minidom.py
+++ b/Lib/test/test_minidom.py
@@ -6,7 +6,6 @@ import io
 from test import support
 import unittest
 
-import pyexpat
 import xml.dom.minidom
 
 from xml.dom.minidom import parse, Attr, Node, Document, parseString
@@ -1163,13 +1162,11 @@ class MinidomTest(unittest.TestCase):
 
         # Verify that character decoding errors raise exceptions instead
         # of crashing
-        if pyexpat.version_info >= (2, 4, 5):
-            self.assertRaises(ExpatError, parseString,
-                    b'<fran\xe7ais></fran\xe7ais>')
-            self.assertRaises(ExpatError, parseString,
-                    b'<franais>Comment \xe7a va ? Tr\xe8s bien ?</franais>')
-        else:
-            self.assertRaises(UnicodeDecodeError, parseString,
+        # It doesn’t make any sense to insist on the exact text of the
+        # error message, or even the exact Exception … it is enough that
+        # the error has been discovered.
+        with self.assertRaises((UnicodeDecodeError, ExpatError)):
+            parseString(
                 b'<fran\xe7ais>Comment \xe7a va ? Tr\xe8s bien ?</fran\xe7ais>')
 
         doc.unlink()
@@ -1631,12 +1628,10 @@ class MinidomTest(unittest.TestCase):
         self.confirm(doc2.namespaceURI == xml.dom.EMPTY_NAMESPACE)
 
     def testExceptionOnSpacesInXMLNSValue(self):
-        if pyexpat.version_info >= (2, 4, 5):
-            context = self.assertRaisesRegex(ExpatError, 'syntax error')
-        else:
-            context = self.assertRaisesRegex(ValueError, 'Unsupported syntax')
-
-        with context:
+        # It doesn’t make any sense to insist on the exact text of the
+        # error message, or even the exact Exception … it is enough that
+        # the error has been discovered.
+        with self.assertRaises((ExpatError, ValueError)):
             parseString('<element xmlns:abc="http:abc.com/de f g/hi/j k"><abc:foo /></element>')
 
     def testDocRemoveChild(self):
--- a/Lib/test/test_pyexpat.py
+++ b/Lib/test/test_pyexpat.py
@@ -14,8 +14,7 @@ from test.support import os_helper
 from xml.parsers import expat
 from xml.parsers.expat import errors
 
-from test.support import sortdict, is_emscripten, is_wasi
-
+from test.support import sortdict, is_emscripten, is_wasi, is_expat_2_6_0
 
 class SetAttributeTest(unittest.TestCase):
     def setUp(self):
@@ -770,9 +769,8 @@ class ReparseDeferralTest(unittest.TestC
         self.assertIs(parser.GetReparseDeferralEnabled(), enabled)
 
     def test_reparse_deferral_enabled(self):
-        if expat.version_info < (2, 6, 0):
-            self.skipTest(f'Expat {expat.version_info} does not '
-                          'support reparse deferral')
+        if not is_expat_2_6_0:
+            self.skipTest("Linked libexpat doesn't support reparse deferral")
 
         started = []
 
@@ -801,9 +799,9 @@ class ReparseDeferralTest(unittest.TestC
 
         parser = expat.ParserCreate()
         parser.StartElementHandler = start_element
-        if expat.version_info >= (2, 6, 0):
+        if is_expat_2_6_0:
             parser.SetReparseDeferralEnabled(False)
-        self.assertFalse(parser.GetReparseDeferralEnabled())
+            self.assertFalse(parser.GetReparseDeferralEnabled())
 
         for chunk in (b'<doc', b'/>'):
             parser.Parse(chunk, False)
--- a/Lib/test/test_sax.py
+++ b/Lib/test/test_sax.py
@@ -19,13 +19,11 @@ from xml.sax.xmlreader import InputSourc
 from io import BytesIO, StringIO
 import codecs
 import os.path
-import pyexpat
 import shutil
 import sys
 from urllib.error import URLError
 import urllib.request
-from test.support import os_helper
-from test.support import findfile
+from test.support import os_helper, findfile, is_expat_2_6_0
 from test.support.os_helper import FakePath, TESTFN
 
 
@@ -1215,10 +1213,10 @@ class ExpatReaderTest(XmlTestBase):
 
         self.assertEqual(result.getvalue(), start + b"<doc>text</doc>")
 
-    @unittest.skipIf(pyexpat.version_info < (2, 6, 0),
-                     f'Expat {pyexpat.version_info} does not '
-                     'support reparse deferral')
     def test_flush_reparse_deferral_enabled(self):
+        if not is_expat_2_6_0:
+            self.skipTest("Linked libexpat doesn't support reparse deferral")
+
         result = BytesIO()
         xmlgen = XMLGenerator(result)
         parser = create_parser()
@@ -1241,6 +1239,9 @@ class ExpatReaderTest(XmlTestBase):
         self.assertEqual(result.getvalue(), start + b"<doc></doc>")
 
     def test_flush_reparse_deferral_disabled(self):
+        if not is_expat_2_6_0:
+            self.skipTest("Linked libexpat doesn't support reparse deferral")
+
         result = BytesIO()
         xmlgen = XMLGenerator(result)
         parser = create_parser()
@@ -1249,9 +1250,8 @@ class ExpatReaderTest(XmlTestBase):
         for chunk in ("<doc", ">"):
             parser.feed(chunk)
 
-        if pyexpat.version_info >= (2, 6, 0):
-            parser._parser.SetReparseDeferralEnabled(False)
-            self.assertEqual(result.getvalue(), start)  # i.e. no elements started
+        parser._parser.SetReparseDeferralEnabled(False)
+        self.assertEqual(result.getvalue(), start)  # i.e. no elements started
 
         self.assertFalse(parser._parser.GetReparseDeferralEnabled())
 
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -13,7 +13,6 @@ import itertools
 import operator
 import os
 import pickle
-import pyexpat
 import sys
 import textwrap
 import types
@@ -1424,12 +1423,6 @@ class XMLPullParserTest(unittest.TestCas
         self.assert_event_tags(parser, [('end', 'root')])
         self.assertIsNone(parser.close())
 
-    def test_simple_xml_chunk_1(self):
-        self.test_simple_xml(chunk_size=1, flush=True)
-
-    def test_simple_xml_chunk_5(self):
-        self.test_simple_xml(chunk_size=5, flush=True)
-
     def test_simple_xml_chunk_22(self):
         self.test_simple_xml(chunk_size=22)
 
@@ -1627,9 +1620,6 @@ class XMLPullParserTest(unittest.TestCas
         with self.assertRaises(ValueError):
             ET.XMLPullParser(events=('start', 'end', 'bogus'))
 
-    @unittest.skipIf(pyexpat.version_info < (2, 6, 0),
-                     f'Expat {pyexpat.version_info} does not '
-                     'support reparse deferral')
     def test_flush_reparse_deferral_enabled(self):
         parser = ET.XMLPullParser(events=('start', 'end'))
 
@@ -1656,8 +1646,6 @@ class XMLPullParserTest(unittest.TestCas
 
         for chunk in ("<doc", ">"):
             parser.feed(chunk)
-
-        if pyexpat.version_info >= (2, 6, 0):
             if not ET is pyET:
                 self.skipTest(f'XMLParser.(Get|Set)ReparseDeferralEnabled '
                               'methods not available in C')