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Security fix for CVE-2022-48560

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RHEL-16702
This commit is contained in:
Lumir Balhar 2023-11-30 10:12:13 +01:00
parent cec2df2191
commit 70a4f6fadd
2 changed files with 150 additions and 1 deletions
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136
00408-cve-2022-48560.patch Normal file
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@ -0,0 +1,136 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Lumir Balhar <lbalhar@redhat.com>
Date: Thu, 23 Nov 2023 13:25:44 +0100
Subject: [PATCH] 00408-cve-2022-48560.patch
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Security fix for CVE-2022-48560: python3: use after free in heappushpop()
of heapq module
Resolved upstream: https://github.com/python/cpython/issues/83602
Backported from Python 3.6.11.
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
Co-authored-by: Lumír Balhar <lbalhar@redhat.com>
---
Lib/test/test_heapq.py | 32 ++++++++++++++++++++++++++++++++
Modules/_heapqmodule.c | 31 ++++++++++++++++++++++++-------
2 files changed, 56 insertions(+), 7 deletions(-)
diff --git a/Lib/test/test_heapq.py b/Lib/test/test_heapq.py
index c4de593bb82..29cefb5d1a6 100644
--- a/Lib/test/test_heapq.py
+++ b/Lib/test/test_heapq.py
@@ -396,6 +396,38 @@ class TestErrorHandling(TestCase):
with self.assertRaises((IndexError, RuntimeError)):
self.module.heappop(heap)
+ def test_comparison_operator_modifiying_heap(self):
+ # See bpo-39421: Strong references need to be taken
+ # when comparing objects as they can alter the heap
+ class EvilClass(int):
+ def __lt__(self, o):
+ heap[:] = []
+ return NotImplemented
+
+ heap = []
+ self.module.heappush(heap, EvilClass(0))
+ self.assertRaises(IndexError, self.module.heappushpop, heap, 1)
+
+ def test_comparison_operator_modifiying_heap_two_heaps(self):
+
+ class h(int):
+ def __lt__(self, o):
+ list2[:] = []
+ return NotImplemented
+
+ class g(int):
+ def __lt__(self, o):
+ list1[:] = []
+ return NotImplemented
+
+ list1, list2 = [], []
+
+ self.module.heappush(list1, h(0))
+ self.module.heappush(list2, g(0))
+
+ self.assertRaises((IndexError, RuntimeError), self.module.heappush, list1, g(1))
+ self.assertRaises((IndexError, RuntimeError), self.module.heappush, list2, h(1))
+
class TestErrorHandlingPython(TestErrorHandling):
module = py_heapq
diff --git a/Modules/_heapqmodule.c b/Modules/_heapqmodule.c
index 5b0ef691545..c013aee1ebf 100644
--- a/Modules/_heapqmodule.c
+++ b/Modules/_heapqmodule.c
@@ -52,7 +52,11 @@ _siftdown(PyListObject *heap, Py_ssize_t startpos, Py_ssize_t pos)
while (pos > startpos) {
parentpos = (pos - 1) >> 1;
parent = PyList_GET_ITEM(heap, parentpos);
+ Py_INCREF(newitem);
+ Py_INCREF(parent);
cmp = cmp_lt(newitem, parent);
+ Py_DECREF(parent);
+ Py_DECREF(newitem);
if (cmp == -1)
return -1;
if (size != PyList_GET_SIZE(heap)) {
@@ -93,9 +97,13 @@ _siftup(PyListObject *heap, Py_ssize_t pos)
childpos = 2*pos + 1; /* leftmost child position */
rightpos = childpos + 1;
if (rightpos < endpos) {
- cmp = cmp_lt(
- PyList_GET_ITEM(heap, childpos),
- PyList_GET_ITEM(heap, rightpos));
+ PyObject* a = PyList_GET_ITEM(heap, childpos);
+ PyObject* b = PyList_GET_ITEM(heap, rightpos);
+ Py_INCREF(a);
+ Py_INCREF(b);
+ cmp = cmp_lt(a, b);
+ Py_DECREF(a);
+ Py_DECREF(b);
if (cmp == -1)
return -1;
if (cmp == 0)
@@ -236,7 +244,10 @@ heappushpop(PyObject *self, PyObject *args)
return item;
}
- cmp = cmp_lt(PyList_GET_ITEM(heap, 0), item);
+ PyObject* top = PyList_GET_ITEM(heap, 0);
+ Py_INCREF(top);
+ cmp = cmp_lt(top, item);
+ Py_DECREF(top);
if (cmp == -1)
return NULL;
if (cmp == 0) {
@@ -395,7 +406,9 @@ _siftdownmax(PyListObject *heap, Py_ssize_t startpos, Py_ssize_t pos)
while (pos > startpos){
parentpos = (pos - 1) >> 1;
parent = PyList_GET_ITEM(heap, parentpos);
+ Py_INCREF(parent);
cmp = cmp_lt(parent, newitem);
+ Py_DECREF(parent);
if (cmp == -1) {
Py_DECREF(newitem);
return -1;
@@ -436,9 +449,13 @@ _siftupmax(PyListObject *heap, Py_ssize_t pos)
childpos = 2*pos + 1; /* leftmost child position */
rightpos = childpos + 1;
if (rightpos < endpos) {
- cmp = cmp_lt(
- PyList_GET_ITEM(heap, rightpos),
- PyList_GET_ITEM(heap, childpos));
+ PyObject* a = PyList_GET_ITEM(heap, rightpos);
+ PyObject* b = PyList_GET_ITEM(heap, childpos);
+ Py_INCREF(a);
+ Py_INCREF(b);
+ cmp = cmp_lt(a, b);
+ Py_DECREF(a);
+ Py_DECREF(b);
if (cmp == -1) {
Py_DECREF(newitem);
return -1;

15
python2.spec
View File

@ -104,7 +104,7 @@ Summary: An interpreted, interactive, object-oriented programming language
Name: %{python}
# Remember to also rebase python2-docs when changing this:
Version: 2.7.18
Release: 16%{?dist}
Release: 17%{?dist}
License: Python
Group: Development/Languages
Requires: %{python}-libs%{?_isa} = %{version}-%{release}
@ -845,6 +845,14 @@ Patch404: 00404-cve-2023-40217.patch
# Tracking bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2022-48565
Patch406: 00406-cve-2022-48565.patch
# 00408 # 7cfb7e151bb64b384c47bfe0dddf5c2d6837772f
# Security fix for CVE-2022-48560: python3: use after free in heappushpop()
# of heapq module
# Resolved upstream: https://github.com/python/cpython/issues/83602
#
# Backported from Python 3.6.11.
Patch408: 00408-cve-2022-48560.patch
# (New patches go here ^^^)
#
# When adding new patches to "python2" and "python3" in Fedora, EL, etc.,
@ -1184,6 +1192,7 @@ git apply %{PATCH351}
%patch399 -p1
%patch404 -p1
%patch406 -p1
%patch408 -p1
# This shouldn't be necesarry, but is right now (2.2a3)
@ -2123,6 +2132,10 @@ fi
# ======================================================
%changelog
* Thu Nov 30 2023 Lumír Balhar <lbalhar@redhat.com> - 2.7.18-17
- Security fix for CVE-2022-48560
Resolves: RHEL-16702
* Thu Oct 12 2023 Lumír Balhar <lbalhar@redhat.com> - 2.7.18-16
- Fix for CVE-2022-48565
Resolves: RHEL-7088