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gerrit.openbmc.org / mdmillerii / openbmc / 97771a30474a164ca08efd09209692a1fb8a4574 / . / poky / meta / recipes-devtools / python / python3 / CVE-2021-3177.patch
blob: a48207162f659fbda6d5de2adc3bb1998311545d [file] [log] [blame]
Andrew Geisslerd1e89492021-02-12 15:35:20 -0600[diff] [blame]1From c347cbe694743cee120457aa6626712f7799a932 Mon Sep 17 00:00:00 2001
2From: "Miss Islington (bot)"
3 <31488909+miss-islington@users.noreply.github.com>
4Date: Mon, 18 Jan 2021 13:29:31 -0800
5Subject: [PATCH] closes bpo-42938: Replace snprintf with Python unicode
6 formatting in ctypes param reprs. (GH-24247)
7
8(cherry picked from commit 916610ef90a0d0761f08747f7b0905541f0977c7)
9
10Co-authored-by: Benjamin Peterson <benjamin@python.org>
11
12Co-authored-by: Benjamin Peterson <benjamin@python.org>
13
14CVE: CVE-2021-3177
15Upstream-Status: Backport [https://github.com/python/cpython/commit/c347cbe694743cee120457aa6626712f7799a932]
16Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
17---
18 Lib/ctypes/test/test_parameters.py | 43 ++++++++++++++++
19 .../2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst | 2 +
20 Modules/_ctypes/callproc.c | 51 +++++++------------
21 3 files changed, 64 insertions(+), 32 deletions(-)
22 create mode 100644 Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst
23
24diff --git a/Lib/ctypes/test/test_parameters.py b/Lib/ctypes/test/test_parameters.py
25index e4c25fd880cef..531894fdec838 100644
26--- a/Lib/ctypes/test/test_parameters.py
27+++ b/Lib/ctypes/test/test_parameters.py
28@@ -201,6 +201,49 @@ def __dict__(self):
29 with self.assertRaises(ZeroDivisionError):
30 WorseStruct().__setstate__({}, b'foo')
31
32+ def test_parameter_repr(self):
33+ from ctypes import (
34+ c_bool,
35+ c_char,
36+ c_wchar,
37+ c_byte,
38+ c_ubyte,
39+ c_short,
40+ c_ushort,
41+ c_int,
42+ c_uint,
43+ c_long,
44+ c_ulong,
45+ c_longlong,
46+ c_ulonglong,
47+ c_float,
48+ c_double,
49+ c_longdouble,
50+ c_char_p,
51+ c_wchar_p,
52+ c_void_p,
53+ )
54+ self.assertRegex(repr(c_bool.from_param(True)), r"^<cparam '\?' at 0x[A-Fa-f0-9]+>$")
55+ self.assertEqual(repr(c_char.from_param(97)), "<cparam 'c' ('a')>")
56+ self.assertRegex(repr(c_wchar.from_param('a')), r"^<cparam 'u' at 0x[A-Fa-f0-9]+>$")
57+ self.assertEqual(repr(c_byte.from_param(98)), "<cparam 'b' (98)>")
58+ self.assertEqual(repr(c_ubyte.from_param(98)), "<cparam 'B' (98)>")
59+ self.assertEqual(repr(c_short.from_param(511)), "<cparam 'h' (511)>")
60+ self.assertEqual(repr(c_ushort.from_param(511)), "<cparam 'H' (511)>")
61+ self.assertRegex(repr(c_int.from_param(20000)), r"^<cparam '[li]' \(20000\)>$")
62+ self.assertRegex(repr(c_uint.from_param(20000)), r"^<cparam '[LI]' \(20000\)>$")
63+ self.assertRegex(repr(c_long.from_param(20000)), r"^<cparam '[li]' \(20000\)>$")
64+ self.assertRegex(repr(c_ulong.from_param(20000)), r"^<cparam '[LI]' \(20000\)>$")
65+ self.assertRegex(repr(c_longlong.from_param(20000)), r"^<cparam '[liq]' \(20000\)>$")
66+ self.assertRegex(repr(c_ulonglong.from_param(20000)), r"^<cparam '[LIQ]' \(20000\)>$")
67+ self.assertEqual(repr(c_float.from_param(1.5)), "<cparam 'f' (1.5)>")
68+ self.assertEqual(repr(c_double.from_param(1.5)), "<cparam 'd' (1.5)>")
69+ self.assertEqual(repr(c_double.from_param(1e300)), "<cparam 'd' (1e+300)>")
70+ self.assertRegex(repr(c_longdouble.from_param(1.5)), r"^<cparam ('d' \(1.5\)|'g' at 0x[A-Fa-f0-9]+)>$")
71+ self.assertRegex(repr(c_char_p.from_param(b'hihi')), "^<cparam 'z' \(0x[A-Fa-f0-9]+\)>$")
72+ self.assertRegex(repr(c_wchar_p.from_param('hihi')), "^<cparam 'Z' \(0x[A-Fa-f0-9]+\)>$")
73+ self.assertRegex(repr(c_void_p.from_param(0x12)), r"^<cparam 'P' \(0x0*12\)>$")
74+
75 ################################################################
76
77 if __name__ == '__main__':
78diff --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
79new file mode 100644
80index 0000000000000..7df65a156feab
81--- /dev/null
82+++ b/Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst
83@@ -0,0 +1,2 @@
84+Avoid static buffers when computing the repr of :class:`ctypes.c_double` and
85+:class:`ctypes.c_longdouble` values.
86diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
87index b0a36a30248f7..f2506de54498e 100644
88--- a/Modules/_ctypes/callproc.c
89+++ b/Modules/_ctypes/callproc.c
90@@ -489,58 +489,47 @@ is_literal_char(unsigned char c)
91 static PyObject *
92 PyCArg_repr(PyCArgObject *self)
93 {
94- char buffer[256];
95 switch(self->tag) {
96 case 'b':
97 case 'B':
98- sprintf(buffer, "<cparam '%c' (%d)>",
99+ return PyUnicode_FromFormat("<cparam '%c' (%d)>",
100 self->tag, self->value.b);
101- break;
102 case 'h':
103 case 'H':
104- sprintf(buffer, "<cparam '%c' (%d)>",
105+ return PyUnicode_FromFormat("<cparam '%c' (%d)>",
106 self->tag, self->value.h);
107- break;
108 case 'i':
109 case 'I':
110- sprintf(buffer, "<cparam '%c' (%d)>",
111+ return PyUnicode_FromFormat("<cparam '%c' (%d)>",
112 self->tag, self->value.i);
113- break;
114 case 'l':
115 case 'L':
116- sprintf(buffer, "<cparam '%c' (%ld)>",
117+ return PyUnicode_FromFormat("<cparam '%c' (%ld)>",
118 self->tag, self->value.l);
119- break;
120
121 case 'q':
122 case 'Q':
123- sprintf(buffer,
124-#ifdef MS_WIN32
125- "<cparam '%c' (%I64d)>",
126-#else
127- "<cparam '%c' (%lld)>",
128-#endif
129+ return PyUnicode_FromFormat("<cparam '%c' (%lld)>",
130 self->tag, self->value.q);
131- break;
132 case 'd':
133- sprintf(buffer, "<cparam '%c' (%f)>",
134- self->tag, self->value.d);
135- break;
136- case 'f':
137- sprintf(buffer, "<cparam '%c' (%f)>",
138- self->tag, self->value.f);
139- break;
140-
141+ case 'f': {
142+ PyObject *f = PyFloat_FromDouble((self->tag == 'f') ? self->value.f : self->value.d);
143+ if (f == NULL) {
144+ return NULL;
145+ }
146+ PyObject *result = PyUnicode_FromFormat("<cparam '%c' (%R)>", self->tag, f);
147+ Py_DECREF(f);
148+ return result;
149+ }
150 case 'c':
151 if (is_literal_char((unsigned char)self->value.c)) {
152- sprintf(buffer, "<cparam '%c' ('%c')>",
153+ return PyUnicode_FromFormat("<cparam '%c' ('%c')>",
154 self->tag, self->value.c);
155 }
156 else {
157- sprintf(buffer, "<cparam '%c' ('\\x%02x')>",
158+ return PyUnicode_FromFormat("<cparam '%c' ('\\x%02x')>",
159 self->tag, (unsigned char)self->value.c);
160 }
161- break;
162
163 /* Hm, are these 'z' and 'Z' codes useful at all?
164 Shouldn't they be replaced by the functionality of c_string
165@@ -549,22 +538,20 @@ PyCArg_repr(PyCArgObject *self)
166 case 'z':
167 case 'Z':
168 case 'P':
169- sprintf(buffer, "<cparam '%c' (%p)>",
170+ return PyUnicode_FromFormat("<cparam '%c' (%p)>",
171 self->tag, self->value.p);
172 break;
173
174 default:
175 if (is_literal_char((unsigned char)self->tag)) {
176- sprintf(buffer, "<cparam '%c' at %p>",
177+ return PyUnicode_FromFormat("<cparam '%c' at %p>",
178 (unsigned char)self->tag, (void *)self);
179 }
180 else {
181- sprintf(buffer, "<cparam 0x%02x at %p>",
182+ return PyUnicode_FromFormat("<cparam 0x%02x at %p>",
183 (unsigned char)self->tag, (void *)self);
184 }
185- break;
186 }
187- return PyUnicode_FromString(buffer);
188 }
189
190 static PyMemberDef PyCArgType_members[] = {
191