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CVE-2023-52425-libexpat-2.6.0-backport.patch
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File CVE-2023-52425-libexpat-2.6.0-backport.patch of Package python3-base
From d7133c7e0f91b14c390aa30a5689c353ef754fb6 Mon Sep 17 00:00:00 2001 From: Sebastian Pipping <sebastian@pipping.org> Date: Wed, 7 Feb 2024 15:32:45 +0100 Subject: [PATCH] Fix etree XMLPullParser tests for Expat >=2.6.0 with reparse deferral Combined with gh#python/cpython!31453 bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453) Curly brackets were never allowed in namespace URIs according to RFC 3986, and so-called namespace-validating XML parsers have the right to reject them a invalid URIs. libexpat >=2.4.5 has become strcter in that regard due to related security issues; with ET.XML instantiating a namespace-aware parser under the hood, this test has no future in CPython. References: - https://datatracker.ietf.org/doc/html/rfc3968 - https://www.w3.org/TR/xml-names/ Also, test_minidom.py: Support Expat >=2.4.5 (cherry picked from commit 2cae93832f46b245847bdc252456ddf7742ef45e) Co-authored-by: Sebastian Pipping <sebastian@pipping.org> Fixes: gh#python/cpython#115133 From-PR: gh#python/cpython!115138 Patch: CVE-2023-52425-libexpat-2.6.0-backport.patch --- Lib/test/support/__init__.py | 13 +- Lib/test/test_minidom.py | 12 + Lib/test/test_pyexpat.py | 61 +++++++++- Lib/test/test_sax.py | 54 ++++++++ Lib/test/test_xml_etree.py | 14 +- Misc/NEWS.d/next/Library/2022-02-20-21-03-31.bpo-46811.8BxgdQ.rst | 1 Misc/NEWS.d/next/Tests/2024-02-07-15-49-37.gh-issue-115133.WBajNr.rst | 1 7 files changed, 146 insertions(+), 10 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2022-02-20-21-03-31.bpo-46811.8BxgdQ.rst create mode 100644 Misc/NEWS.d/next/Tests/2024-02-07-15-49-37.gh-issue-115133.WBajNr.rst --- a/Lib/test/support/__init__.py +++ b/Lib/test/support/__init__.py @@ -19,6 +19,7 @@ import platform import re import shutil import socket +import pyexpat import stat import struct import subprocess @@ -102,7 +103,7 @@ __all__ = [ # miscellaneous "check_warnings", "EnvironmentVarGuard", "run_with_locale", "swap_item", "swap_attr", "Matcher", "set_memlimit", "SuppressCrashReport", "sortdict", - "run_with_tz", + "run_with_tz", "fails_with_expat_2_6_0", "is_expat_2_6_0", ] class Error(Exception): @@ -2343,3 +2344,13 @@ def adjust_int_max_str_digits(max_digits yield finally: sys.set_int_max_str_digits(current) + + +@functools.lru_cache(maxsize=32) +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 @@ -9,6 +9,7 @@ import xml.dom.minidom from xml.dom.minidom import parse, Node, Document, parseString from xml.dom.minidom import getDOMImplementation +from xml.parsers.expat import ExpatError tstfile = findfile("test.xml", subdir="xmltestdata") @@ -1090,7 +1091,11 @@ class MinidomTest(unittest.TestCase): # Verify that character decoding errors raise exceptions instead # of crashing - 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() @@ -1536,7 +1541,10 @@ class MinidomTest(unittest.TestCase): self.confirm(doc2.namespaceURI == xml.dom.EMPTY_NAMESPACE) def testExceptionOnSpacesInXMLNSValue(self): - with self.assertRaisesRegex(ValueError, 'Unsupported syntax'): + # 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 @@ -11,7 +11,7 @@ import traceback from xml.parsers import expat from xml.parsers.expat import errors -from test.support import sortdict, run_unittest +from test.support import sortdict, run_unittest, is_expat_2_6_0 class SetAttributeTest(unittest.TestCase): @@ -749,5 +749,64 @@ def test_main(): ErrorMessageTest, ForeignDTDTests) +class ReparseDeferralTest(unittest.TestCase): + def test_getter_setter_round_trip(self): + if not is_expat_2_6_0: + self.skipTest("Linked libexpat doesn't support reparse deferral") + + parser = expat.ParserCreate() + enabled = (expat.version_info >= (2, 6, 0)) + + self.assertIs(parser.GetReparseDeferralEnabled(), enabled) + parser.SetReparseDeferralEnabled(False) + self.assertIs(parser.GetReparseDeferralEnabled(), False) + parser.SetReparseDeferralEnabled(True) + self.assertIs(parser.GetReparseDeferralEnabled(), enabled) + + def test_reparse_deferral_enabled(self): + if not is_expat_2_6_0: + self.skipTest("Linked libexpat doesn't support reparse deferral") + + started = [] + + def start_element(name, _): + started.append(name) + + parser = expat.ParserCreate() + parser.StartElementHandler = start_element + self.assertTrue(parser.GetReparseDeferralEnabled()) + + for chunk in (b'<doc', b'/>'): + parser.Parse(chunk, False) + + # The key test: Have handlers already fired? Expecting: no. + self.assertEqual(started, []) + + parser.Parse(b'', True) + + self.assertEqual(started, ['doc']) + + def test_reparse_deferral_disabled(self): + if not is_expat_2_6_0: + self.skipTest("Linked libexpat doesn't support reparse deferral") + + started = [] + + def start_element(name, _): + started.append(name) + + parser = expat.ParserCreate() + parser.StartElementHandler = start_element + if is_expat_2_6_0: + parser.SetReparseDeferralEnabled(False) + self.assertFalse(parser.GetReparseDeferralEnabled()) + + for chunk in (b'<doc', b'/>'): + parser.Parse(chunk, False) + + # The key test: Have handlers already fired? Expecting: yes. + self.assertEqual(started, ['doc']) + + if __name__ == "__main__": test_main() --- a/Lib/test/test_sax.py +++ b/Lib/test/test_sax.py @@ -20,7 +20,7 @@ import gc import os.path import shutil from test import support -from test.support import findfile, run_unittest, TESTFN +from test.support import findfile, run_unittest, TESTFN, is_expat_2_6_0 TEST_XMLFILE = findfile("test.xml", subdir="xmltestdata") TEST_XMLFILE_OUT = findfile("test.xml.out", subdir="xmltestdata") @@ -1060,6 +1060,58 @@ class ExpatReaderTest(XmlTestBase): self.assertEqual(result.getvalue(), start + b"<doc>text</doc>") + 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() + parser.setContentHandler(xmlgen) + + for chunk in ("<doc", ">"): + parser.feed(chunk) + + self.assertEqual(result.getvalue(), start) # i.e. no elements started + self.assertTrue(parser._parser.GetReparseDeferralEnabled()) + + parser.flush() + + self.assertTrue(parser._parser.GetReparseDeferralEnabled()) + self.assertEqual(result.getvalue(), start + b"<doc>") + + parser.feed("</doc>") + parser.close() + + 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() + parser.setContentHandler(xmlgen) + + for chunk in ("<doc", ">"): + parser.feed(chunk) + + parser._parser.SetReparseDeferralEnabled(False) + self.assertEqual(result.getvalue(), start) # i.e. no elements started + + self.assertFalse(parser._parser.GetReparseDeferralEnabled()) + + parser.flush() + + self.assertFalse(parser._parser.GetReparseDeferralEnabled()) + self.assertEqual(result.getvalue(), start + b"<doc>") + + parser.feed("</doc>") + parser.close() + + self.assertEqual(result.getvalue(), start + b"<doc></doc>") + # ===== Locator support def test_expat_locator_noinfo(self): --- a/Lib/test/test_xml_etree.py +++ b/Lib/test/test_xml_etree.py @@ -18,7 +18,8 @@ import weakref from itertools import product from test import support -from test.support import TESTFN, findfile, import_fresh_module, gc_collect +from test.support import (TESTFN, findfile, import_fresh_module, + gc_collect, is_expat_2_6_0, fails_with_expat_2_6_0) # pyET is the pure-Python implementation. # @@ -1026,6 +1027,7 @@ class XMLPullParserTest(unittest.TestCas def test_simple_xml(self): for chunk_size in (None, 1, 5): with self.subTest(chunk_size=chunk_size): + expected_events = [] parser = ET.XMLPullParser() self.assert_event_tags(parser, []) self._feed(parser, "<!-- comment -->\n", chunk_size) @@ -1035,16 +1037,17 @@ class XMLPullParserTest(unittest.TestCas chunk_size) self.assert_event_tags(parser, []) self._feed(parser, ">\n", chunk_size) - self.assert_event_tags(parser, [('end', 'element')]) + expected_events += [('end', 'element')] self._feed(parser, "<element>text</element>tail\n", chunk_size) self._feed(parser, "<empty-element/>\n", chunk_size) - self.assert_event_tags(parser, [ + expected_events += [ ('end', 'element'), ('end', 'empty-element'), - ]) + ] self._feed(parser, "</root>\n", chunk_size) - self.assert_event_tags(parser, [('end', 'root')]) + expected_events += [('end', 'root')] self.assertIsNone(parser.close()) + self.assert_event_tags(parser, expected_events) def test_feed_while_iterating(self): parser = ET.XMLPullParser() @@ -1646,6 +1649,7 @@ class BugsTest(unittest.TestCase): b"<?xml version='1.0' encoding='ascii'?>\n" b'<body>tãg</body>') + @unittest.skip('Fails with modern libexpat.') def test_issue3151(self): e = ET.XML('<prefix:localname xmlns:prefix="${stuff}"/>') self.assertEqual(e.tag, '{${stuff}}localname') --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-02-20-21-03-31.bpo-46811.8BxgdQ.rst @@ -0,0 +1 @@ +Make test suite support Expat >=2.4.5 --- /dev/null +++ b/Misc/NEWS.d/next/Tests/2024-02-07-15-49-37.gh-issue-115133.WBajNr.rst @@ -0,0 +1 @@ +Fix etree XMLPullParser tests for Expat >=2.6.0 with reparse deferral
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