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Issue #23914: Fixed SystemError raised by unpickler on broken pickle data.

This commit is contained in:
Serhiy Storchaka 2015-11-23 15:17:43 +02:00
parent b6aa5375d5
commit e9b3074cf9
4 changed files with 105 additions and 4 deletions
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85
Lib/test/pickletester.py
View File

@ -12,7 +12,7 @@ import weakref
from http.cookies import SimpleCookie
from test.support import (
TestFailed, TESTFN, run_with_locale, no_tracing,
TestFailed, TESTFN, run_with_locale, no_tracing, captured_stdout,
_2G, _4G, bigmemtest,
)
@ -987,6 +987,89 @@ class AbstractUnpickleTests(unittest.TestCase):
self.assertIs(type(unpickled), collections.UserDict)
self.assertEqual(unpickled, collections.UserDict({1: 2}))
def test_bad_stack(self):
badpickles = [
b'0.', # POP
b'1.', # POP_MARK
b'2.', # DUP
# b'(2.', # PyUnpickler doesn't raise
b'R.', # REDUCE
b')R.',
b'a.', # APPEND
b'Na.',
b'b.', # BUILD
b'Nb.',
b'd.', # DICT
b'e.', # APPENDS
# b'(e.', # PyUnpickler raises AttributeError
b'ibuiltins\nlist\n.', # INST
b'l.', # LIST
b'o.', # OBJ
b'(o.',
b'p1\n.', # PUT
b'q\x00.', # BINPUT
b'r\x00\x00\x00\x00.', # LONG_BINPUT
b's.', # SETITEM
b'Ns.',
b'NNs.',
b't.', # TUPLE
b'u.', # SETITEMS
b'(u.',
b'}(Nu.',
b'\x81.', # NEWOBJ
b')\x81.',
b'\x85.', # TUPLE1
b'\x86.', # TUPLE2
b'N\x86.',
b'\x87.', # TUPLE3
b'N\x87.',
b'NN\x87.',
b'\x90.', # ADDITEMS
# b'(\x90.', # PyUnpickler raises AttributeError
b'\x91.', # FROZENSET
b'\x92.', # NEWOBJ_EX
b')}\x92.',
b'\x93.', # STACK_GLOBAL
b'Vlist\n\x93.',
b'\x94.', # MEMOIZE
]
for p in badpickles:
with self.subTest(p):
self.assertRaises(self.bad_stack_errors, self.loads, p)
def test_bad_mark(self):
badpickles = [
b'cbuiltins\nlist\n)(R.', # REDUCE
b'cbuiltins\nlist\n()R.',
b']N(a.', # APPEND
b'cbuiltins\nValueError\n)R}(b.', # BUILD
b'cbuiltins\nValueError\n)R(}b.',
b'(Nd.', # DICT
b'}NN(s.', # SETITEM
b'}N(Ns.',
b'cbuiltins\nlist\n)(\x81.', # NEWOBJ
b'cbuiltins\nlist\n()\x81.',
b'N(\x85.', # TUPLE1
b'NN(\x86.', # TUPLE2
b'N(N\x86.',
b'NNN(\x87.', # TUPLE3
b'NN(N\x87.',
b'N(NN\x87.',
b'cbuiltins\nlist\n)}(\x92.', # NEWOBJ_EX
b'cbuiltins\nlist\n)(}\x92.',
b'cbuiltins\nlist\n()}\x92.',
b'Vbuiltins\n(Vlist\n\x93.', # STACK_GLOBAL
b'Vbuiltins\nVlist\n(\x93.',
]
for p in badpickles:
# PyUnpickler prints reduce errors to stdout
with self.subTest(p), captured_stdout():
try:
self.loads(p)
except (IndexError, AttributeError, TypeError,
pickle.UnpicklingError):
pass
class AbstractPickleTests(unittest.TestCase):
# Subclass must define self.dumps, self.loads.

3
Lib/test/test_pickle.py
View File

@ -32,6 +32,7 @@ class PickleTests(AbstractPickleModuleTests):
class PyUnpicklerTests(AbstractUnpickleTests):
unpickler = pickle._Unpickler
bad_stack_errors = (IndexError,)
def loads(self, buf, **kwds):
f = io.BytesIO(buf)
@ -62,6 +63,7 @@ class InMemoryPickleTests(AbstractPickleTests, AbstractUnpickleTests,
pickler = pickle._Pickler
unpickler = pickle._Unpickler
bad_stack_errors = (pickle.UnpicklingError, IndexError)
def dumps(self, arg, protocol=None):
return pickle.dumps(arg, protocol)
@ -119,6 +121,7 @@ class PyChainDispatchTableTests(AbstractDispatchTableTests):
if has_c_implementation:
class CUnpicklerTests(PyUnpicklerTests):
unpickler = _pickle.Unpickler
bad_stack_errors = (pickle.UnpicklingError,)
class CPicklerTests(PyPicklerTests):
pickler = _pickle.Pickler

2
Misc/NEWS
View File

@ -106,6 +106,8 @@ Core and Builtins
Library
-------
- Issue #23914: Fixed SystemError raised by unpickler on broken pickle data.
- Issue #25691: Fixed crash on deleting ElementTree.Element attributes.
- Issue #25624: ZipFile now always writes a ZIP_STORED header for directory

19
Modules/_pickle.c
View File

@ -448,8 +448,8 @@ Pdata_grow(Pdata *self)
static PyObject *
Pdata_pop(Pdata *self)
{
PickleState *st = _Pickle_GetGlobalState();
if (Py_SIZE(self) == 0) {
PickleState *st = _Pickle_GetGlobalState();
PyErr_SetString(st->UnpicklingError, "bad pickle data");
return NULL;
}
@ -5079,6 +5079,9 @@ load_obj(UnpicklerObject *self)
if ((i = marker(self)) < 0)
return -1;
if (Py_SIZE(self->stack) - i < 1)
return stack_underflow();
args = Pdata_poptuple(self->stack, i + 1);
if (args == NULL)
return -1;
@ -5737,13 +5740,18 @@ do_append(UnpicklerObject *self, Py_ssize_t x)
static int
load_append(UnpicklerObject *self)
{
if (Py_SIZE(self->stack) - 1 <= 0)
return stack_underflow();
return do_append(self, Py_SIZE(self->stack) - 1);
}
static int
load_appends(UnpicklerObject *self)
{
return do_append(self, marker(self));
Py_ssize_t i = marker(self);
if (i < 0)
return -1;
return do_append(self, i);
}
static int
@ -5793,7 +5801,10 @@ load_setitem(UnpicklerObject *self)
static int
load_setitems(UnpicklerObject *self)
{
return do_setitems(self, marker(self));
Py_ssize_t i = marker(self);
if (i < 0)
return -1;
return do_setitems(self, i);
}
static int
@ -5803,6 +5814,8 @@ load_additems(UnpicklerObject *self)
Py_ssize_t mark, len, i;
mark = marker(self);
if (mark < 0)
return -1;
len = Py_SIZE(self->stack);
if (mark > len || mark <= 0)
return stack_underflow();