From 489ef4207141aa8527be95a5ba86aa30540357a4 Mon Sep 17 00:00:00 2001 From: Anuj Mittal Date: Mon, 1 Feb 2021 11:20:22 +0800 Subject: python3: fix CVE-2021-3177 Signed-off-by: Anuj Mittal (cherry picked from commit 25d1cae49e56797c4c9e91c01697c4de02dee046) Signed-off-by: Steve Sakoman --- .../python/python3/CVE-2021-3177.patch | 191 +++++++++++++++++++++ meta/recipes-devtools/python/python3_3.8.2.bb | 1 + 2 files changed, 192 insertions(+) create mode 100644 meta/recipes-devtools/python/python3/CVE-2021-3177.patch diff --git a/meta/recipes-devtools/python/python3/CVE-2021-3177.patch b/meta/recipes-devtools/python/python3/CVE-2021-3177.patch new file mode 100644 index 0000000000..43d678db46 --- /dev/null +++ b/meta/recipes-devtools/python/python3/CVE-2021-3177.patch @@ -0,0 +1,191 @@ +From ece5dfd403dac211f8d3c72701fe7ba7b7aa5b5f Mon Sep 17 00:00:00 2001 +From: "Miss Islington (bot)" + <31488909+miss-islington@users.noreply.github.com> +Date: Mon, 18 Jan 2021 13:28:52 -0800 +Subject: [PATCH] closes bpo-42938: Replace snprintf with Python unicode + formatting in ctypes param reprs. (GH-24248) + +(cherry picked from commit 916610ef90a0d0761f08747f7b0905541f0977c7) + +Co-authored-by: Benjamin Peterson + +Co-authored-by: Benjamin Peterson + +CVE: CVE-2021-3177 +Upstream-Status: Backport [https://github.com/python/cpython/commit/ece5dfd403dac211f8d3c72701fe7ba7b7aa5b5f] +Signed-off-by: Anuj Mittal +--- + Lib/ctypes/test/test_parameters.py | 43 ++++++++++++++++ + .../2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst | 2 + + Modules/_ctypes/callproc.c | 51 +++++++------------ + 3 files changed, 64 insertions(+), 32 deletions(-) + create mode 100644 Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst + +diff --git a/Lib/ctypes/test/test_parameters.py b/Lib/ctypes/test/test_parameters.py +index e4c25fd880cef..531894fdec838 100644 +--- a/Lib/ctypes/test/test_parameters.py ++++ b/Lib/ctypes/test/test_parameters.py +@@ -201,6 +201,49 @@ def __dict__(self): + with self.assertRaises(ZeroDivisionError): + WorseStruct().__setstate__({}, b'foo') + ++ def test_parameter_repr(self): ++ from ctypes import ( ++ c_bool, ++ c_char, ++ c_wchar, ++ c_byte, ++ c_ubyte, ++ c_short, ++ c_ushort, ++ c_int, ++ c_uint, ++ c_long, ++ c_ulong, ++ c_longlong, ++ c_ulonglong, ++ c_float, ++ c_double, ++ c_longdouble, ++ c_char_p, ++ c_wchar_p, ++ c_void_p, ++ ) ++ self.assertRegex(repr(c_bool.from_param(True)), r"^$") ++ self.assertEqual(repr(c_char.from_param(97)), "") ++ self.assertRegex(repr(c_wchar.from_param('a')), r"^$") ++ self.assertEqual(repr(c_byte.from_param(98)), "") ++ self.assertEqual(repr(c_ubyte.from_param(98)), "") ++ self.assertEqual(repr(c_short.from_param(511)), "") ++ self.assertEqual(repr(c_ushort.from_param(511)), "") ++ self.assertRegex(repr(c_int.from_param(20000)), r"^$") ++ self.assertRegex(repr(c_uint.from_param(20000)), r"^$") ++ self.assertRegex(repr(c_long.from_param(20000)), r"^$") ++ self.assertRegex(repr(c_ulong.from_param(20000)), r"^$") ++ self.assertRegex(repr(c_longlong.from_param(20000)), r"^$") ++ self.assertRegex(repr(c_ulonglong.from_param(20000)), r"^$") ++ self.assertEqual(repr(c_float.from_param(1.5)), "") ++ self.assertEqual(repr(c_double.from_param(1.5)), "") ++ self.assertEqual(repr(c_double.from_param(1e300)), "") ++ self.assertRegex(repr(c_longdouble.from_param(1.5)), r"^$") ++ self.assertRegex(repr(c_char_p.from_param(b'hihi')), "^$") ++ self.assertRegex(repr(c_wchar_p.from_param('hihi')), "^$") ++ self.assertRegex(repr(c_void_p.from_param(0x12)), r"^$") ++ + ################################################################ + + if __name__ == '__main__': +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 +new file mode 100644 +index 0000000000000..7df65a156feab +--- /dev/null ++++ b/Misc/NEWS.d/next/Security/2021-01-18-09-27-31.bpo-42938.4Zn4Mp.rst +@@ -0,0 +1,2 @@ ++Avoid static buffers when computing the repr of :class:`ctypes.c_double` and ++:class:`ctypes.c_longdouble` values. +diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c +index a9b8675cd951b..de75918d49f37 100644 +--- a/Modules/_ctypes/callproc.c ++++ b/Modules/_ctypes/callproc.c +@@ -484,58 +484,47 @@ is_literal_char(unsigned char c) + static PyObject * + PyCArg_repr(PyCArgObject *self) + { +- char buffer[256]; + switch(self->tag) { + case 'b': + case 'B': +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, self->value.b); +- break; + case 'h': + case 'H': +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, self->value.h); +- break; + case 'i': + case 'I': +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, self->value.i); +- break; + case 'l': + case 'L': +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, self->value.l); +- break; + + case 'q': + case 'Q': +- sprintf(buffer, +-#ifdef MS_WIN32 +- "", +-#else +- "", +-#endif ++ return PyUnicode_FromFormat("", + self->tag, self->value.q); +- break; + case 'd': +- sprintf(buffer, "", +- self->tag, self->value.d); +- break; +- case 'f': +- sprintf(buffer, "", +- self->tag, self->value.f); +- break; +- ++ case 'f': { ++ PyObject *f = PyFloat_FromDouble((self->tag == 'f') ? self->value.f : self->value.d); ++ if (f == NULL) { ++ return NULL; ++ } ++ PyObject *result = PyUnicode_FromFormat("", self->tag, f); ++ Py_DECREF(f); ++ return result; ++ } + case 'c': + if (is_literal_char((unsigned char)self->value.c)) { +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, self->value.c); + } + else { +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, (unsigned char)self->value.c); + } +- break; + + /* Hm, are these 'z' and 'Z' codes useful at all? + Shouldn't they be replaced by the functionality of c_string +@@ -544,22 +533,20 @@ PyCArg_repr(PyCArgObject *self) + case 'z': + case 'Z': + case 'P': +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + self->tag, self->value.p); + break; + + default: + if (is_literal_char((unsigned char)self->tag)) { +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + (unsigned char)self->tag, (void *)self); + } + else { +- sprintf(buffer, "", ++ return PyUnicode_FromFormat("", + (unsigned char)self->tag, (void *)self); + } +- break; + } +- return PyUnicode_FromString(buffer); + } + + static PyMemberDef PyCArgType_members[] = { + diff --git a/meta/recipes-devtools/python/python3_3.8.2.bb b/meta/recipes-devtools/python/python3_3.8.2.bb index a448b3ed97..646e271014 100644 --- a/meta/recipes-devtools/python/python3_3.8.2.bb +++ b/meta/recipes-devtools/python/python3_3.8.2.bb @@ -37,6 +37,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \ file://CVE-2020-14422.patch \ file://CVE-2020-26116.patch \ file://CVE-2020-27619.patch \ + file://CVE-2021-3177.patch \ " SRC_URI_append_class-native = " \ -- cgit 1.2.3-korg