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Commit 68a74091 authored by Serhiy Storchaka's avatar Serhiy Storchaka
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Issue #23055: Fixed a buffer overflow in PyUnicode_FromFormatV. Analysis 

and fix by Guido Vranken.
parent 52e46bd2
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Showing with 133 additions and 42 deletions
Lib/test/test_unicode.py
View file @ 68a74091
......@@ -2016,9 +2016,10 @@ class UnicodeTest(string_tests.CommonTest,
# Test PyUnicode_FromFormat()
def test_from_format(self):
support.import_module('ctypes')
from ctypes import (pythonapi, py_object,
from ctypes import (
pythonapi, py_object, sizeof,
c_int, c_long, c_longlong, c_ssize_t,
c_uint, c_ulong, c_ulonglong, c_size_t)
c_uint, c_ulong, c_ulonglong, c_size_t, c_void_p)
name = "PyUnicode_FromFormat"
_PyUnicode_FromFormat = getattr(pythonapi, name)
_PyUnicode_FromFormat.restype = py_object
......@@ -2029,9 +2030,13 @@ class UnicodeTest(string_tests.CommonTest,
for arg in args)
return _PyUnicode_FromFormat(format, *cargs)
def check_format(expected, format, *args):
text = PyUnicode_FromFormat(format, *args)
self.assertEqual(expected, text)
# ascii format, non-ascii argument
text = PyUnicode_FromFormat(b'ascii\x7f=%U', 'unicode\xe9')
self.assertEqual(text, 'ascii\x7f=unicode\xe9')
check_format('ascii\x7f=unicode\xe9',
b'ascii\x7f=%U', 'unicode\xe9')
# non-ascii format, ascii argument: ensure that PyUnicode_FromFormatV()
# raises an error
......@@ -2041,64 +2046,136 @@ class UnicodeTest(string_tests.CommonTest,
PyUnicode_FromFormat, b'unicode\xe9=%s', 'ascii')
# test "%c"
self.assertEqual(PyUnicode_FromFormat(b'%c', c_int(0xabcd)), '\uabcd')
self.assertEqual(PyUnicode_FromFormat(b'%c', c_int(0x10ffff)), '\U0010ffff')
check_format('\uabcd',
b'%c', c_int(0xabcd))
check_format('\U0010ffff',
b'%c', c_int(0x10ffff))
with self.assertRaises(OverflowError):
PyUnicode_FromFormat(b'%c', c_int(0x110000))
# Issue #18183
self.assertEqual(
PyUnicode_FromFormat(b'%c%c', c_int(0x10000), c_int(0x100000)),
'\U00010000\U00100000')
check_format('\U00010000\U00100000',
b'%c%c', c_int(0x10000), c_int(0x100000))
# test "%"
self.assertEqual(PyUnicode_FromFormat(b'%'), '%')
self.assertEqual(PyUnicode_FromFormat(b'%%'), '%')
self.assertEqual(PyUnicode_FromFormat(b'%%s'), '%s')
self.assertEqual(PyUnicode_FromFormat(b'[%%]'), '[%]')
self.assertEqual(PyUnicode_FromFormat(b'%%%s', b'abc'), '%abc')
check_format('%',
b'%')
check_format('%',
b'%%')
check_format('%s',
b'%%s')
check_format('[%]',
b'[%%]')
check_format('%abc',
b'%%%s', b'abc')
# test %S
check_format("repr=\u20acABC",
b'repr=%S', '\u20acABC')
# test %R
check_format("repr='\u20acABC'",
b'repr=%R', '\u20acABC')
# test integer formats (%i, %d, %u)
self.assertEqual(PyUnicode_FromFormat(b'%03i', c_int(10)), '010')
self.assertEqual(PyUnicode_FromFormat(b'%0.4i', c_int(10)), '0010')
self.assertEqual(PyUnicode_FromFormat(b'%i', c_int(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%li', c_long(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%lli', c_longlong(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%zi', c_ssize_t(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%d', c_int(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%ld', c_long(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%lld', c_longlong(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%zd', c_ssize_t(-123)), '-123')
self.assertEqual(PyUnicode_FromFormat(b'%u', c_uint(123)), '123')
self.assertEqual(PyUnicode_FromFormat(b'%lu', c_ulong(123)), '123')
self.assertEqual(PyUnicode_FromFormat(b'%llu', c_ulonglong(123)), '123')
self.assertEqual(PyUnicode_FromFormat(b'%zu', c_size_t(123)), '123')
check_format('010',
b'%03i', c_int(10))
check_format('0010',
b'%0.4i', c_int(10))
check_format('-123',
b'%i', c_int(-123))
check_format('-123',
b'%li', c_long(-123))
check_format('-123',
b'%lli', c_longlong(-123))
check_format('-123',
b'%zi', c_ssize_t(-123))
check_format('-123',
b'%d', c_int(-123))
check_format('-123',
b'%ld', c_long(-123))
check_format('-123',
b'%lld', c_longlong(-123))
check_format('-123',
b'%zd', c_ssize_t(-123))
check_format('123',
b'%u', c_uint(123))
check_format('123',
b'%lu', c_ulong(123))
check_format('123',
b'%llu', c_ulonglong(123))
check_format('123',
b'%zu', c_size_t(123))
# test long output
min_longlong = -(2 ** (8 * sizeof(c_longlong) - 1))
max_longlong = -min_longlong - 1
check_format(str(min_longlong),
b'%lld', c_longlong(min_longlong))
check_format(str(max_longlong),
b'%lld', c_longlong(max_longlong))
max_ulonglong = 2 ** (8 * sizeof(c_ulonglong)) - 1
check_format(str(max_ulonglong),
b'%llu', c_ulonglong(max_ulonglong))
PyUnicode_FromFormat(b'%p', c_void_p(-1))
# test padding (width and/or precision)
check_format('123'.rjust(10, '0'),
b'%010i', c_int(123))
check_format('123'.rjust(100),
b'%100i', c_int(123))
check_format('123'.rjust(300, '0'),
b'%.300i', c_int(123))
check_format('123'.rjust(80, '0').rjust(100),
b'%100.80i', c_int(123))
check_format('123'.rjust(10, '0'),
b'%010u', c_uint(123))
check_format('123'.rjust(100),
b'%100u', c_uint(123))
check_format('123'.rjust(300, '0'),
b'%.300u', c_uint(123))
check_format('123'.rjust(80, '0').rjust(100),
b'%100.80u', c_uint(123))
check_format('123'.rjust(10, '0'),
b'%010x', c_int(0x123))
check_format('123'.rjust(100),
b'%100x', c_int(0x123))
check_format('123'.rjust(300, '0'),
b'%.300x', c_int(0x123))
check_format('123'.rjust(80, '0').rjust(100),
b'%100.80x', c_int(0x123))
# test %A
text = PyUnicode_FromFormat(b'%%A:%A', 'abc\xe9\uabcd\U0010ffff')
self.assertEqual(text, r"%A:'abc\xe9\uabcd\U0010ffff'")
check_format(r"%A:'abc\xe9\uabcd\U0010ffff'",
b'%%A:%A', 'abc\xe9\uabcd\U0010ffff')
# test %V
text = PyUnicode_FromFormat(b'repr=%V', 'abc', b'xyz')
self.assertEqual(text, 'repr=abc')
check_format('repr=abc',
b'repr=%V', 'abc', b'xyz')
# Test string decode from parameter of %s using utf-8.
# b'\xe4\xba\xba\xe6\xb0\x91' is utf-8 encoded byte sequence of
# '\u4eba\u6c11'
text = PyUnicode_FromFormat(b'repr=%V', None, b'\xe4\xba\xba\xe6\xb0\x91')
self.assertEqual(text, 'repr=\u4eba\u6c11')
check_format('repr=\u4eba\u6c11',
b'repr=%V', None, b'\xe4\xba\xba\xe6\xb0\x91')
#Test replace error handler.
text = PyUnicode_FromFormat(b'repr=%V', None, b'abc\xff')
self.assertEqual(text, 'repr=abc\ufffd')
check_format('repr=abc\ufffd',
b'repr=%V', None, b'abc\xff')
# not supported: copy the raw format string. these tests are just here
# to check for crashs and should not be considered as specifications
self.assertEqual(PyUnicode_FromFormat(b'%1%s', b'abc'), '%s')
self.assertEqual(PyUnicode_FromFormat(b'%1abc'), '%1abc')
self.assertEqual(PyUnicode_FromFormat(b'%+i', c_int(10)), '%+i')
self.assertEqual(PyUnicode_FromFormat(b'%.%s', b'abc'), '%.%s')
check_format('%s',
b'%1%s', b'abc')
check_format('%1abc',
b'%1abc')
check_format('%+i',
b'%+i', c_int(10))
check_format('%.%s',
b'%.%s', b'abc')
# Test PyUnicode_AsWideChar()
@support.cpython_only
......
Misc/NEWS
View file @ 68a74091
......@@ -2,6 +2,18 @@
Python News
+++++++++++
What's New in Python 3.3.7?
============================
*Release date: XXXX-XX-XX*
Core and Builtins
-----------------
- Issue #23055: Fixed a buffer overflow in PyUnicode_FromFormatV. Analysis
and fix by Guido Vranken.
What's New in Python 3.3.6?
===========================
......
Objects/unicodeobject.c
View file @ 68a74091
......@@ -2335,6 +2335,8 @@ parse_format_flags(const char *f,
f--;
}
}
if (width < precision)
width = precision;
if (*f == '\0') {
/* bogus format "%.1" => go backward, f points to "1" */
f--;
......
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