python27: Fix CVE-2021-3177
Thanks to the Gentoo team maintaining a fork of python2¹ we can easily apply their backported patch for this security vulnerability. [1] https://gitweb.gentoo.org/fork/cpython.git/
This commit is contained in:
Martin Weinelt
Frederik Rietdijk
parent
2cbc212983
commit
85cde0d60f
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@ -0,0 +1,181 @@
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From fab838b2ee7cfb9037c24f0f18dfe01aa379b3f7 Mon Sep 17 00:00:00 2001
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From: Benjamin Peterson <benjamin@python.org>
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Date: Mon, 18 Jan 2021 15:11:46 -0600
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Subject: [3.6] closes bpo-42938: Replace snprintf with Python unicode
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formatting in ctypes param reprs. (GH-24250)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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(cherry picked from commit 916610ef90a0d0761f08747f7b0905541f0977c7)
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Co-authored-by: Benjamin Peterson <benjamin@python.org>
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Rebased for Python 2.7 by Michał Górny <mgorny@gentoo.org>
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---
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Lib/ctypes/test/test_parameters.py | 43 +++++++++++++++++++
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.../2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst | 2 +
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Modules/_ctypes/callproc.c | 49 +++++++++++-----------
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3 files changed, 69 insertions(+), 25 deletions(-)
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create mode 100644 Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst
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diff --git a/Lib/ctypes/test/test_parameters.py b/Lib/ctypes/test/test_parameters.py
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index 23c1b6e225..3456882ccb 100644
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--- a/Lib/ctypes/test/test_parameters.py
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+++ b/Lib/ctypes/test/test_parameters.py
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@@ -206,6 +206,49 @@ class SimpleTypesTestCase(unittest.TestCase):
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with self.assertRaises(ZeroDivisionError):
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WorseStruct().__setstate__({}, b'foo')
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+ def test_parameter_repr(self):
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+ from ctypes import (
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+ c_bool,
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+ c_char,
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+ c_wchar,
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+ c_byte,
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+ c_ubyte,
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+ c_short,
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+ c_ushort,
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+ c_int,
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+ c_uint,
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+ c_long,
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+ c_ulong,
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+ c_longlong,
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+ c_ulonglong,
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+ c_float,
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+ c_double,
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+ c_longdouble,
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+ c_char_p,
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+ c_wchar_p,
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+ c_void_p,
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+ )
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+ self.assertRegexpMatches(repr(c_bool.from_param(True)), r"^<cparam '\?' at 0x[A-Fa-f0-9]+>$")
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+ self.assertEqual(repr(c_char.from_param('a')), "<cparam 'c' (a)>")
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+ self.assertRegexpMatches(repr(c_wchar.from_param('a')), r"^<cparam 'u' at 0x[A-Fa-f0-9]+>$")
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+ self.assertEqual(repr(c_byte.from_param(98)), "<cparam 'b' (98)>")
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+ self.assertEqual(repr(c_ubyte.from_param(98)), "<cparam 'B' (98)>")
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+ self.assertEqual(repr(c_short.from_param(511)), "<cparam 'h' (511)>")
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+ self.assertEqual(repr(c_ushort.from_param(511)), "<cparam 'H' (511)>")
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+ self.assertRegexpMatches(repr(c_int.from_param(20000)), r"^<cparam '[li]' \(20000\)>$")
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+ self.assertRegexpMatches(repr(c_uint.from_param(20000)), r"^<cparam '[LI]' \(20000\)>$")
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+ self.assertRegexpMatches(repr(c_long.from_param(20000)), r"^<cparam '[li]' \(20000\)>$")
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+ self.assertRegexpMatches(repr(c_ulong.from_param(20000)), r"^<cparam '[LI]' \(20000\)>$")
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+ self.assertRegexpMatches(repr(c_longlong.from_param(20000)), r"^<cparam '[liq]' \(20000\)>$")
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+ self.assertRegexpMatches(repr(c_ulonglong.from_param(20000)), r"^<cparam '[LIQ]' \(20000\)>$")
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+ self.assertEqual(repr(c_float.from_param(1.5)), "<cparam 'f' (1.5)>")
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+ self.assertEqual(repr(c_double.from_param(1.5)), "<cparam 'd' (1.5)>")
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+ self.assertEqual(repr(c_double.from_param(1e300)), "<cparam 'd' (1e+300)>")
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+ self.assertRegexpMatches(repr(c_longdouble.from_param(1.5)), r"^<cparam ('d' \(1.5\)|'g' at 0x[A-Fa-f0-9]+)>$")
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+ self.assertRegexpMatches(repr(c_char_p.from_param(b'hihi')), "^<cparam 'z' \(0x[A-Fa-f0-9]+\)>$")
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+ self.assertRegexpMatches(repr(c_wchar_p.from_param('hihi')), "^<cparam 'Z' \(0x[A-Fa-f0-9]+\)>$")
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+ self.assertRegexpMatches(repr(c_void_p.from_param(0x12)), r"^<cparam 'P' \(0x0*12\)>$")
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+
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################################################################
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if __name__ == '__main__':
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diff --git a/Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst b/Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst
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new file mode 100644
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index 0000000000..7df65a156f
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst
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@@ -0,0 +1,2 @@
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+Avoid static buffers when computing the repr of :class:`ctypes.c_double` and
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+:class:`ctypes.c_longdouble` values.
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diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
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index 066fefc0cc..421addf353 100644
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--- a/Modules/_ctypes/callproc.c
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+++ b/Modules/_ctypes/callproc.c
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@@ -460,50 +460,51 @@ PyCArg_dealloc(PyCArgObject *self)
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static PyObject *
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PyCArg_repr(PyCArgObject *self)
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{
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- char buffer[256];
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switch(self->tag) {
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case 'b':
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case 'B':
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- sprintf(buffer, "<cparam '%c' (%d)>",
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+ return PyString_FromFormat("<cparam '%c' (%d)>",
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self->tag, self->value.b);
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- break;
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case 'h':
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case 'H':
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- sprintf(buffer, "<cparam '%c' (%d)>",
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+ return PyString_FromFormat("<cparam '%c' (%d)>",
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self->tag, self->value.h);
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- break;
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case 'i':
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case 'I':
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- sprintf(buffer, "<cparam '%c' (%d)>",
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+ return PyString_FromFormat("<cparam '%c' (%d)>",
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self->tag, self->value.i);
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- break;
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case 'l':
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case 'L':
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- sprintf(buffer, "<cparam '%c' (%ld)>",
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+ return PyString_FromFormat("<cparam '%c' (%ld)>",
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self->tag, self->value.l);
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- break;
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#ifdef HAVE_LONG_LONG
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case 'q':
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case 'Q':
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- sprintf(buffer,
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+ return PyString_FromFormat(
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"<cparam '%c' (%" PY_FORMAT_LONG_LONG "d)>",
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self->tag, self->value.q);
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- break;
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#endif
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case 'd':
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- sprintf(buffer, "<cparam '%c' (%f)>",
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- self->tag, self->value.d);
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- break;
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- case 'f':
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- sprintf(buffer, "<cparam '%c' (%f)>",
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- self->tag, self->value.f);
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- break;
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-
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+ case 'f': {
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+ PyObject *f = PyFloat_FromDouble((self->tag == 'f') ? self->value.f : self->value.d);
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+ if (f == NULL) {
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+ return NULL;
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+ }
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+ PyObject *r = PyObject_Repr(f);
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+ if (r == NULL) {
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+ Py_DECREF(f);
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+ return NULL;
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+ }
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+ PyObject *result = PyString_FromFormat(
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+ "<cparam '%c' (%s)>", self->tag, PyString_AsString(r));
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+ Py_DECREF(r);
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+ Py_DECREF(f);
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+ return result;
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+ }
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case 'c':
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- sprintf(buffer, "<cparam '%c' (%c)>",
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+ return PyString_FromFormat("<cparam '%c' (%c)>",
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self->tag, self->value.c);
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- break;
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/* Hm, are these 'z' and 'Z' codes useful at all?
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Shouldn't they be replaced by the functionality of c_string
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@@ -512,16 +513,14 @@ PyCArg_repr(PyCArgObject *self)
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case 'z':
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case 'Z':
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case 'P':
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- sprintf(buffer, "<cparam '%c' (%p)>",
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+ return PyString_FromFormat("<cparam '%c' (%p)>",
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self->tag, self->value.p);
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break;
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default:
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- sprintf(buffer, "<cparam '%c' at %p>",
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+ return PyString_FromFormat("<cparam '%c' at %p>",
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self->tag, self);
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- break;
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}
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- return PyString_FromString(buffer);
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}
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static PyMemberDef PyCArgType_members[] = {
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--
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cgit v1.2.3
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@ -103,6 +103,9 @@ let
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# Patch is likely to go away in the next release (if there is any)
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./CVE-2019-20907.patch
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./CVE-2021-3177.patch
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] ++ optionals (x11Support && stdenv.isDarwin) [
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./use-correct-tcl-tk-on-darwin.patch
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] ++ optionals stdenv.isLinux [
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