python3: patch CVE-2025-12084

Pick patch from 3.12 branch according to [1].

[1] https://nvd.nist.gov/vuln/detail/CVE-2025-12084

(From OE-Core rev: c3ed0dfa3a7b8716008968b0d7f80885b2f61a84)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Paul Barker <paul@pbarker.dev>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 144 insertions, 0 deletions

diff --git a/meta/recipes-devtools/python/python3/CVE-2025-12084.patch b/meta/recipes-devtools/python/python3/CVE-2025-12084.patch
new file mode 100644
index 0000000000..b7c0650cdc
--- /dev/null
+++ b/meta/recipes-devtools/python/python3/CVE-2025-12084.patch
@@ -0,0 +1,144 @@
+From 9c9dda6625a2a90d2a06c657eee021d6be19842d Mon Sep 17 00:00:00 2001
+From: "Miss Islington (bot)"
+ <31488909+miss-islington@users.noreply.github.com>
+Date: Mon, 22 Dec 2025 14:48:49 +0100
+Subject: [PATCH] [3.12] gh-142145: Remove quadratic behavior in node ID cache
+ clearing (GH-142146) (#142211)
+
+* gh-142145: Remove quadratic behavior in node ID cache clearing (GH-142146)
+* gh-142754: Ensure that Element & Attr instances have the ownerDocument attribute (GH-142794)
+(cherry picked from commit 1cc7551b3f9f71efbc88d96dce90f82de98b2454)
+(cherry picked from commit 08d8e18ad81cd45bc4a27d6da478b51ea49486e4)
+(cherry picked from commit 8d2d7bb2e754f8649a68ce4116271a4932f76907)
+
+Co-authored-by: Jacob Walls <38668450+jacobtylerwalls@users.noreply.github.com>
+Co-authored-by: Seth Michael Larson <seth@python.org>
+Co-authored-by: Petr Viktorin <encukou@gmail.com>
+Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
+Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
+Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
+Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
+Co-authored-by: Gregory P. Smith <greg@krypto.org>
+
+CVE: CVE-2025-12084
+Upstream-Status: Backport [https://github.com/python/cpython/commit/9c9dda6625a2a90d2a06c657eee021d6be19842d]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ Lib/test/test_minidom.py                      | 33 ++++++++++++++++++-
+ Lib/xml/dom/minidom.py                        | 11 ++-----
+ ...-12-01-09-36-45.gh-issue-142145.tcAUhg.rst |  6 ++++
+ 3 files changed, 41 insertions(+), 9 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/Security/2025-12-01-09-36-45.gh-issue-142145.tcAUhg.rst
+
+diff --git a/Lib/test/test_minidom.py b/Lib/test/test_minidom.py
+index 699265ccadc..ab4823c8315 100644
+--- a/Lib/test/test_minidom.py
++++ b/Lib/test/test_minidom.py
+@@ -2,13 +2,14 @@
+ 
+ import copy
+ import pickle
++import time
+ import io
+ from test import support
+ import unittest
+ 
+ import xml.dom.minidom
+ 
+-from xml.dom.minidom import parse, Attr, Node, Document, parseString
++from xml.dom.minidom import parse, Attr, Node, Document, Element, parseString
+ from xml.dom.minidom import getDOMImplementation
+ from xml.parsers.expat import ExpatError
+ 
+@@ -176,6 +177,36 @@ class MinidomTest(unittest.TestCase):
+         self.confirm(dom.documentElement.childNodes[-1].data == "Hello")
+         dom.unlink()
+ 
++    @support.requires_resource('cpu')
++    def testAppendChildNoQuadraticComplexity(self):
++        impl = getDOMImplementation()
++
++        newdoc = impl.createDocument(None, "some_tag", None)
++        top_element = newdoc.documentElement
++        children = [newdoc.createElement(f"child-{i}") for i in range(1, 2 ** 15 + 1)]
++        element = top_element
++
++        start = time.monotonic()
++        for child in children:
++            element.appendChild(child)
++            element = child
++        end = time.monotonic()
++
++        # This example used to take at least 30 seconds.
++        # Conservative assertion due to the wide variety of systems and
++        # build configs timing based tests wind up run under.
++        # A --with-address-sanitizer --with-pydebug build on a rpi5 still
++        # completes this loop in <0.5 seconds.
++        self.assertLess(end - start, 4)
++
++    def testSetAttributeNodeWithoutOwnerDocument(self):
++        # regression test for gh-142754
++        elem = Element("test")
++        attr = Attr("id")
++        attr.value = "test-id"
++        elem.setAttributeNode(attr)
++        self.assertEqual(elem.getAttribute("id"), "test-id")
++
+     def testAppendChildFragment(self):
+         dom, orig, c1, c2, c3, frag = self._create_fragment_test_nodes()
+         dom.documentElement.appendChild(frag)
+diff --git a/Lib/xml/dom/minidom.py b/Lib/xml/dom/minidom.py
+index ef8a159833b..cada981f39f 100644
+--- a/Lib/xml/dom/minidom.py
++++ b/Lib/xml/dom/minidom.py
+@@ -292,13 +292,6 @@ def _append_child(self, node):
+     childNodes.append(node)
+     node.parentNode = self
+ 
+-def _in_document(node):
+-    # return True iff node is part of a document tree
+-    while node is not None:
+-        if node.nodeType == Node.DOCUMENT_NODE:
+-            return True
+-        node = node.parentNode
+-    return False
+ 
+ def _write_data(writer, data):
+     "Writes datachars to writer."
+@@ -355,6 +348,7 @@ class Attr(Node):
+     def __init__(self, qName, namespaceURI=EMPTY_NAMESPACE, localName=None,
+                  prefix=None):
+         self.ownerElement = None
++        self.ownerDocument = None
+         self._name = qName
+         self.namespaceURI = namespaceURI
+         self._prefix = prefix
+@@ -680,6 +674,7 @@ class Element(Node):
+ 
+     def __init__(self, tagName, namespaceURI=EMPTY_NAMESPACE, prefix=None,
+                  localName=None):
++        self.ownerDocument = None
+         self.parentNode = None
+         self.tagName = self.nodeName = tagName
+         self.prefix = prefix
+@@ -1539,7 +1534,7 @@ def _clear_id_cache(node):
+     if node.nodeType == Node.DOCUMENT_NODE:
+         node._id_cache.clear()
+         node._id_search_stack = None
+-    elif _in_document(node):
++    elif node.ownerDocument:
+         node.ownerDocument._id_cache.clear()
+         node.ownerDocument._id_search_stack= None
+ 
+diff --git a/Misc/NEWS.d/next/Security/2025-12-01-09-36-45.gh-issue-142145.tcAUhg.rst b/Misc/NEWS.d/next/Security/2025-12-01-09-36-45.gh-issue-142145.tcAUhg.rst
+new file mode 100644
+index 00000000000..05c7df35d14
+--- /dev/null
++++ b/Misc/NEWS.d/next/Security/2025-12-01-09-36-45.gh-issue-142145.tcAUhg.rst
+@@ -0,0 +1,6 @@
++Remove quadratic behavior in ``xml.minidom`` node ID cache clearing.  In order
++to do this without breaking existing users, we also add the *ownerDocument*
++attribute to :mod:`xml.dom.minidom` elements and attributes created by directly
++instantiating the ``Element`` or ``Attr`` class. Note that this way of creating
++nodes is not supported; creator functions like
++:py:meth:`xml.dom.Document.documentElement` should be used instead.