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bpo-34784: Fix PyStructSequence_NewType with heap-allocated StructSequence (GH-9665)

This commit is contained in:
Eddie Elizondo 2018-11-13 04:09:31 -08:00 committed by Petr Viktorin
parent 1a6be91e6f
commit 474eedfb3d
5 changed files with 242 additions and 140 deletions
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2
Misc/NEWS.d/next/Core and Builtins/2018-10-02-09-10-47.bpo-34784.07hdgD.rst Normal file
View File

@ -0,0 +1,2 @@
Fix the implementation of PyStructSequence_NewType in order to create heap
allocated StructSequences.

27
Modules/_testcapimodule.c
View File

@ -3313,6 +3313,31 @@ test_decref_doesnt_leak(PyObject *ob, PyObject *Py_UNUSED(ignored))
Py_RETURN_NONE;
}
static PyObject *
test_structseq_newtype_doesnt_leak(PyObject *Py_UNUSED(self),
PyObject *Py_UNUSED(args))
{
PyStructSequence_Desc descr;
PyStructSequence_Field descr_fields[3];
descr_fields[0] = (PyStructSequence_Field){"foo", "foo value"};
descr_fields[1] = (PyStructSequence_Field){NULL, "some hidden value"};
descr_fields[2] = (PyStructSequence_Field){0, NULL};
descr.name = "_testcapi.test_descr";
descr.doc = "This is used to test for memory leaks in NewType";
descr.fields = descr_fields;
descr.n_in_sequence = 1;
PyTypeObject* structseq_type = PyStructSequence_NewType(&descr);
assert(structseq_type != NULL);
assert(PyType_Check(structseq_type));
assert(PyType_FastSubclass(structseq_type, Py_TPFLAGS_TUPLE_SUBCLASS));
Py_DECREF(structseq_type);
Py_RETURN_NONE;
}
static PyObject *
test_incref_decref_API(PyObject *ob, PyObject *Py_UNUSED(ignored))
{
@ -4721,6 +4746,8 @@ static PyMethodDef TestMethods[] = {
{"test_incref_doesnt_leak", test_incref_doesnt_leak, METH_NOARGS},
{"test_xdecref_doesnt_leak",test_xdecref_doesnt_leak, METH_NOARGS},
{"test_decref_doesnt_leak", test_decref_doesnt_leak, METH_NOARGS},
{"test_structseq_newtype_doesnt_leak",
test_structseq_newtype_doesnt_leak, METH_NOARGS},
{"test_incref_decref_API", test_incref_decref_API, METH_NOARGS},
{"test_long_and_overflow", test_long_and_overflow, METH_NOARGS},
{"test_long_as_double", test_long_as_double, METH_NOARGS},

94
Modules/posixmodule.c
View File

@ -1948,14 +1948,14 @@ static PyStructSequence_Desc waitid_result_desc = {
waitid_result_fields,
5
};
static PyTypeObject WaitidResultType;
static PyTypeObject* WaitidResultType;
#endif
static int initialized;
static PyTypeObject StatResultType;
static PyTypeObject StatVFSResultType;
static PyTypeObject* StatResultType;
static PyTypeObject* StatVFSResultType;
#if defined(HAVE_SCHED_SETPARAM) || defined(HAVE_SCHED_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDPARAM)
static PyTypeObject SchedParamType;
static PyTypeObject* SchedParamType;
#endif
static newfunc structseq_new;
@ -2029,7 +2029,7 @@ static PyObject*
_pystat_fromstructstat(STRUCT_STAT *st)
{
unsigned long ansec, mnsec, cnsec;
PyObject *v = PyStructSequence_New(&StatResultType);
PyObject *v = PyStructSequence_New(StatResultType);
if (v == NULL)
return NULL;
@ -4407,7 +4407,7 @@ static PyStructSequence_Desc uname_result_desc = {
5
};
static PyTypeObject UnameResultType;
static PyTypeObject* UnameResultType;
#ifdef HAVE_UNAME
@ -4435,7 +4435,7 @@ os_uname_impl(PyObject *module)
if (res < 0)
return posix_error();
value = PyStructSequence_New(&UnameResultType);
value = PyStructSequence_New(UnameResultType);
if (value == NULL)
return NULL;
@ -5941,7 +5941,7 @@ os_sched_getscheduler_impl(PyObject *module, pid_t pid)
#if defined(HAVE_SCHED_SETPARAM) || defined(HAVE_SCHED_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDPARAM)
/*[clinic input]
class os.sched_param "PyObject *" "&SchedParamType"
class os.sched_param "PyObject *" "SchedParamType"
@classmethod
os.sched_param.__new__
@ -5954,7 +5954,7 @@ Current has only one field: sched_priority");
static PyObject *
os_sched_param_impl(PyTypeObject *type, PyObject *sched_priority)
/*[clinic end generated code: output=48f4067d60f48c13 input=73a4c22f7071fc62]*/
/*[clinic end generated code: output=48f4067d60f48c13 input=ab4de35a9a7811f2]*/
{
PyObject *res;
@ -5986,7 +5986,7 @@ convert_sched_param(PyObject *param, struct sched_param *res)
{
long priority;
if (Py_TYPE(param) != &SchedParamType) {
if (Py_TYPE(param) != SchedParamType) {
PyErr_SetString(PyExc_TypeError, "must have a sched_param object");
return 0;
}
@ -6057,7 +6057,7 @@ os_sched_getparam_impl(PyObject *module, pid_t pid)
if (sched_getparam(pid, &param))
return posix_error();
result = PyStructSequence_New(&SchedParamType);
result = PyStructSequence_New(SchedParamType);
if (!result)
return NULL;
priority = PyLong_FromLong(param.sched_priority);
@ -7422,7 +7422,7 @@ os_waitid_impl(PyObject *module, idtype_t idtype, id_t id, int options)
if (si.si_pid == 0)
Py_RETURN_NONE;
result = PyStructSequence_New(&WaitidResultType);
result = PyStructSequence_New(WaitidResultType);
if (!result)
return NULL;
@ -7857,7 +7857,7 @@ static PyStructSequence_Desc times_result_desc = {
5
};
static PyTypeObject TimesResultType;
static PyTypeObject* TimesResultType;
#ifdef MS_WINDOWS
#define HAVE_TIMES /* mandatory, for the method table */
@ -7870,7 +7870,7 @@ build_times_result(double user, double system,
double children_user, double children_system,
double elapsed)
{
PyObject *value = PyStructSequence_New(&TimesResultType);
PyObject *value = PyStructSequence_New(TimesResultType);
if (value == NULL)
return NULL;
@ -9950,7 +9950,7 @@ os_WSTOPSIG_impl(PyObject *module, int status)
static PyObject*
_pystatvfs_fromstructstatvfs(struct statvfs st) {
PyObject *v = PyStructSequence_New(&StatVFSResultType);
PyObject *v = PyStructSequence_New(StatVFSResultType);
if (v == NULL)
return NULL;
@ -11703,7 +11703,7 @@ os_urandom_impl(PyObject *module, Py_ssize_t size)
/* Terminal size querying */
static PyTypeObject TerminalSizeType;
static PyTypeObject* TerminalSizeType;
PyDoc_STRVAR(TerminalSize_docstring,
"A tuple of (columns, lines) for holding terminal window size");
@ -11795,7 +11795,7 @@ get_terminal_size(PyObject *self, PyObject *args)
}
#endif /* TERMSIZE_USE_CONIO */
termsize = PyStructSequence_New(&TerminalSizeType);
termsize = PyStructSequence_New(TerminalSizeType);
if (termsize == NULL)
return NULL;
PyStructSequence_SET_ITEM(termsize, 0, PyLong_FromLong(columns));
@ -13912,23 +13912,28 @@ INITFUNC(void)
if (!initialized) {
#if defined(HAVE_WAITID) && !defined(__APPLE__)
waitid_result_desc.name = MODNAME ".waitid_result";
if (PyStructSequence_InitType2(&WaitidResultType, &waitid_result_desc) < 0)
WaitidResultType = PyStructSequence_NewType(&waitid_result_desc);
if (WaitidResultType == NULL) {
return NULL;
}
#endif
stat_result_desc.name = "os.stat_result"; /* see issue #19209 */
stat_result_desc.fields[7].name = PyStructSequence_UnnamedField;
stat_result_desc.fields[8].name = PyStructSequence_UnnamedField;
stat_result_desc.fields[9].name = PyStructSequence_UnnamedField;
if (PyStructSequence_InitType2(&StatResultType, &stat_result_desc) < 0)
StatResultType = PyStructSequence_NewType(&stat_result_desc);
if (StatResultType == NULL) {
return NULL;
structseq_new = StatResultType.tp_new;
StatResultType.tp_new = statresult_new;
}
structseq_new = StatResultType->tp_new;
StatResultType->tp_new = statresult_new;
statvfs_result_desc.name = "os.statvfs_result"; /* see issue #19209 */
if (PyStructSequence_InitType2(&StatVFSResultType,
&statvfs_result_desc) < 0)
StatVFSResultType = PyStructSequence_NewType(&statvfs_result_desc);
if (StatVFSResultType == NULL) {
return NULL;
}
#ifdef NEED_TICKS_PER_SECOND
# if defined(HAVE_SYSCONF) && defined(_SC_CLK_TCK)
ticks_per_second = sysconf(_SC_CLK_TCK);
@ -13941,15 +13946,18 @@ INITFUNC(void)
#if defined(HAVE_SCHED_SETPARAM) || defined(HAVE_SCHED_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDPARAM)
sched_param_desc.name = MODNAME ".sched_param";
if (PyStructSequence_InitType2(&SchedParamType, &sched_param_desc) < 0)
SchedParamType = PyStructSequence_NewType(&sched_param_desc);
if (SchedParamType == NULL) {
return NULL;
SchedParamType.tp_new = os_sched_param;
}
SchedParamType->tp_new = os_sched_param;
#endif
/* initialize TerminalSize_info */
if (PyStructSequence_InitType2(&TerminalSizeType,
&TerminalSize_desc) < 0)
TerminalSizeType = PyStructSequence_NewType(&TerminalSize_desc);
if (TerminalSizeType == NULL) {
return NULL;
}
/* initialize scandir types */
if (PyType_Ready(&ScandirIteratorType) < 0)
@ -13958,29 +13966,33 @@ INITFUNC(void)
return NULL;
}
#if defined(HAVE_WAITID) && !defined(__APPLE__)
Py_INCREF((PyObject*) &WaitidResultType);
PyModule_AddObject(m, "waitid_result", (PyObject*) &WaitidResultType);
Py_INCREF((PyObject*) WaitidResultType);
PyModule_AddObject(m, "waitid_result", (PyObject*) WaitidResultType);
#endif
Py_INCREF((PyObject*) &StatResultType);
PyModule_AddObject(m, "stat_result", (PyObject*) &StatResultType);
Py_INCREF((PyObject*) &StatVFSResultType);
Py_INCREF((PyObject*) StatResultType);
PyModule_AddObject(m, "stat_result", (PyObject*) StatResultType);
Py_INCREF((PyObject*) StatVFSResultType);
PyModule_AddObject(m, "statvfs_result",
(PyObject*) &StatVFSResultType);
(PyObject*) StatVFSResultType);
#if defined(HAVE_SCHED_SETPARAM) || defined(HAVE_SCHED_SETSCHEDULER)
Py_INCREF(&SchedParamType);
PyModule_AddObject(m, "sched_param", (PyObject *)&SchedParamType);
Py_INCREF(SchedParamType);
PyModule_AddObject(m, "sched_param", (PyObject *)SchedParamType);
#endif
times_result_desc.name = MODNAME ".times_result";
if (PyStructSequence_InitType2(&TimesResultType, &times_result_desc) < 0)
TimesResultType = PyStructSequence_NewType(&times_result_desc);
if (TimesResultType == NULL) {
return NULL;
PyModule_AddObject(m, "times_result", (PyObject *)&TimesResultType);
}
PyModule_AddObject(m, "times_result", (PyObject *)TimesResultType);
uname_result_desc.name = MODNAME ".uname_result";
if (PyStructSequence_InitType2(&UnameResultType, &uname_result_desc) < 0)
UnameResultType = PyStructSequence_NewType(&uname_result_desc);
if (UnameResultType == NULL) {
return NULL;
PyModule_AddObject(m, "uname_result", (PyObject *)&UnameResultType);
}
PyModule_AddObject(m, "uname_result", (PyObject *)UnameResultType);
#ifdef __APPLE__
/*
@ -14020,8 +14032,8 @@ INITFUNC(void)
#endif /* __APPLE__ */
Py_INCREF(&TerminalSizeType);
PyModule_AddObject(m, "terminal_size", (PyObject*) &TerminalSizeType);
Py_INCREF(TerminalSizeType);
PyModule_AddObject(m, "terminal_size", (PyObject*)TerminalSizeType);
billion = PyLong_FromLong(1000000000);
if (!billion)

241
Objects/structseq.c
View File

@ -287,105 +287,30 @@ static PyMethodDef structseq_methods[] = {
{NULL, NULL}
};
static PyTypeObject _struct_sequence_template = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
NULL, /* tp_name */
sizeof(PyStructSequence) - sizeof(PyObject *), /* tp_basicsize */
sizeof(PyObject *), /* tp_itemsize */
(destructor)structseq_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
(reprfunc)structseq_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
NULL, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
structseq_methods, /* tp_methods */
NULL, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
structseq_new, /* tp_new */
};
static Py_ssize_t
count_members(PyStructSequence_Desc *desc, Py_ssize_t *n_unnamed_members) {
Py_ssize_t i;
int
PyStructSequence_InitType2(PyTypeObject *type, PyStructSequence_Desc *desc)
{
PyObject *dict;
PyMemberDef* members;
Py_ssize_t n_members, n_unnamed_members, i, k;
*n_unnamed_members = 0;
for (i = 0; desc->fields[i].name != NULL; ++i) {
if (desc->fields[i].name == PyStructSequence_UnnamedField) {
(*n_unnamed_members)++;
}
}
return i;
}
static int
initialize_structseq_dict(PyStructSequence_Desc *desc, PyObject* dict,
Py_ssize_t n_members, Py_ssize_t n_unnamed_members) {
PyObject *v;
#ifdef Py_TRACE_REFS
/* if the type object was chained, unchain it first
before overwriting its storage */
if (type->ob_base.ob_base._ob_next) {
_Py_ForgetReference((PyObject*)type);
}
#endif
n_unnamed_members = 0;
for (i = 0; desc->fields[i].name != NULL; ++i)
if (desc->fields[i].name == PyStructSequence_UnnamedField)
n_unnamed_members++;
n_members = i;
memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
type->tp_base = &PyTuple_Type;
type->tp_name = desc->name;
type->tp_doc = desc->doc;
members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);
if (members == NULL) {
PyErr_NoMemory();
return -1;
}
for (i = k = 0; i < n_members; ++i) {
if (desc->fields[i].name == PyStructSequence_UnnamedField)
continue;
members[k].name = desc->fields[i].name;
members[k].type = T_OBJECT;
members[k].offset = offsetof(PyStructSequence, ob_item)
+ i * sizeof(PyObject*);
members[k].flags = READONLY;
members[k].doc = desc->fields[i].doc;
k++;
}
members[k].name = NULL;
type->tp_members = members;
if (PyType_Ready(type) < 0)
return -1;
Py_INCREF(type);
dict = type->tp_dict;
#define SET_DICT_FROM_SIZE(key, value) \
do { \
v = PyLong_FromSsize_t(value); \
if (v == NULL) \
if (v == NULL) { \
return -1; \
} \
if (PyDict_SetItemString(dict, key, v) < 0) { \
Py_DECREF(v); \
return -1; \
@ -396,6 +321,84 @@ PyStructSequence_InitType2(PyTypeObject *type, PyStructSequence_Desc *desc)
SET_DICT_FROM_SIZE(visible_length_key, desc->n_in_sequence);
SET_DICT_FROM_SIZE(real_length_key, n_members);
SET_DICT_FROM_SIZE(unnamed_fields_key, n_unnamed_members);
return 0;
}
static void
initialize_members(PyStructSequence_Desc *desc, PyMemberDef* members,
Py_ssize_t n_members) {
Py_ssize_t i, k;
for (i = k = 0; i < n_members; ++i) {
if (desc->fields[i].name == PyStructSequence_UnnamedField) {
continue;
}
/* The names and docstrings in these MemberDefs are statically */
/* allocated so it is expected that they'll outlive the MemberDef */
members[k].name = desc->fields[i].name;
members[k].type = T_OBJECT;
members[k].offset = offsetof(PyStructSequence, ob_item)
+ i * sizeof(PyObject*);
members[k].flags = READONLY;
members[k].doc = desc->fields[i].doc;
k++;
}
members[k].name = NULL;
}
int
PyStructSequence_InitType2(PyTypeObject *type, PyStructSequence_Desc *desc)
{
PyMemberDef *members;
Py_ssize_t n_members, n_unnamed_members;
#ifdef Py_TRACE_REFS
/* if the type object was chained, unchain it first
before overwriting its storage */
if (type->ob_base.ob_base._ob_next) {
_Py_ForgetReference((PyObject *)type);
}
#endif
/* PyTypeObject has already been initialized */
if (Py_REFCNT(type) != 0) {
PyErr_BadInternalCall();
return -1;
}
type->tp_name = desc->name;
type->tp_basicsize = sizeof(PyStructSequence) - sizeof(PyObject *);
type->tp_itemsize = sizeof(PyObject *);
type->tp_dealloc = (destructor)structseq_dealloc;
type->tp_repr = (reprfunc)structseq_repr;
type->tp_doc = desc->doc;
type->tp_base = &PyTuple_Type;
type->tp_methods = structseq_methods;
type->tp_new = structseq_new;
type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC;
n_members = count_members(desc, &n_unnamed_members);
members = PyMem_NEW(PyMemberDef, n_members - n_unnamed_members + 1);
if (members == NULL) {
PyErr_NoMemory();
return -1;
}
initialize_members(desc, members, n_members);
type->tp_members = members;
if (PyType_Ready(type) < 0) {
PyMem_FREE(members);
return -1;
}
Py_INCREF(type);
if (initialize_structseq_dict(
desc, type->tp_dict, n_members, n_unnamed_members) < 0) {
PyMem_FREE(members);
Py_DECREF(type);
return -1;
}
return 0;
}
@ -406,19 +409,57 @@ PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
(void)PyStructSequence_InitType2(type, desc);
}
PyTypeObject*
PyTypeObject *
PyStructSequence_NewType(PyStructSequence_Desc *desc)
{
PyTypeObject *result;
PyMemberDef *members;
PyObject *bases;
PyTypeObject *type;
PyType_Slot slots[7];
PyType_Spec spec;
Py_ssize_t n_members, n_unnamed_members;
result = (PyTypeObject*)PyType_GenericAlloc(&PyType_Type, 0);
if (result == NULL)
return NULL;
if (PyStructSequence_InitType2(result, desc) < 0) {
Py_DECREF(result);
/* Initialize MemberDefs */
n_members = count_members(desc, &n_unnamed_members);
members = PyMem_NEW(PyMemberDef, n_members - n_unnamed_members + 1);
if (members == NULL) {
PyErr_NoMemory();
return NULL;
}
return result;
initialize_members(desc, members, n_members);
/* Initialize Slots */
slots[0] = (PyType_Slot){Py_tp_dealloc, (destructor)structseq_dealloc};
slots[1] = (PyType_Slot){Py_tp_repr, (reprfunc)structseq_repr};
slots[2] = (PyType_Slot){Py_tp_doc, (void *)desc->doc};
slots[3] = (PyType_Slot){Py_tp_methods, structseq_methods};
slots[4] = (PyType_Slot){Py_tp_new, structseq_new};
slots[5] = (PyType_Slot){Py_tp_members, members};
slots[6] = (PyType_Slot){0, 0};
/* Initialize Spec */
/* The name in this PyType_Spec is statically allocated so it is */
/* expected that it'll outlive the PyType_Spec */
spec.name = desc->name;
spec.basicsize = sizeof(PyStructSequence) - sizeof(PyObject *);
spec.itemsize = sizeof(PyObject *);
spec.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC;
spec.slots = slots;
bases = PyTuple_Pack(1, &PyTuple_Type);
type = (PyTypeObject *)PyType_FromSpecWithBases(&spec, bases);
Py_DECREF(bases);
PyMem_FREE(members);
if (type == NULL) {
return NULL;
}
if (initialize_structseq_dict(
desc, type->tp_dict, n_members, n_unnamed_members) < 0) {
return NULL;
}
return type;
}
int _PyStructSequence_Init(void)

30
Objects/typeobject.c
View File

@ -2846,15 +2846,28 @@ static const short slotoffsets[] = {
PyObject *
PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
{
PyHeapTypeObject *res = (PyHeapTypeObject*)PyType_GenericAlloc(&PyType_Type, 0);
PyTypeObject *type, *base;
PyHeapTypeObject *res;
PyMemberDef *memb;
PyObject *modname;
char *s;
char *res_start = (char*)res;
PyType_Slot *slot;
PyTypeObject *type, *base;
PyType_Slot *slot;
Py_ssize_t nmembers;
char *s, *res_start;
nmembers = 0;
for (slot = spec->slots; slot->slot; slot++) {
if (slot->slot == Py_tp_members) {
for (memb = slot->pfunc; memb->name != NULL; memb++) {
nmembers++;
}
}
}
res = (PyHeapTypeObject*)PyType_GenericAlloc(&PyType_Type, nmembers);
if (res == NULL)
return NULL;
res_start = (char*)res;
if (spec->name == NULL) {
PyErr_SetString(PyExc_SystemError,
@ -2950,6 +2963,13 @@ PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
memcpy(tp_doc, old_doc, len);
type->tp_doc = tp_doc;
}
/* Move the slots to the heap type itself */
if (slot->slot == Py_tp_members) {
size_t len = Py_TYPE(type)->tp_itemsize * nmembers;
memcpy(PyHeapType_GET_MEMBERS(res), slot->pfunc, len);
type->tp_members = PyHeapType_GET_MEMBERS(res);
}
}
if (type->tp_dealloc == NULL) {
/* It's a heap type, so needs the heap types' dealloc.