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gh-111178: fix UBSan failures in Python/context.c #128242

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Merged
merged 4 commits into from
Jan 8, 2025
Merged

gh-111178: fix UBSan failures in Python/context.c #128242

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d9b1042
fix UBSan failures for `PyContext`
picnixz Dec 23, 2024
c9f8a06
fix UBSan failures for `PyContextVar`
picnixz Dec 23, 2024
e63ca99
fix UBSan failures for `PyContextToken`
picnixz Dec 23, 2024
637335d
fix UBSan failures for `_PyContextTokenMissing`
picnixz Dec 23, 2024
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fix UBSan failures for PyContext
  • Loading branch information
@picnixz
picnixz committed Dec 23, 2024
commit d9b10424fc156b531a0d5be97e7ea32b990d08ed
63 changes: 34 additions & 29 deletions Python/context.c
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Original file line number Diff line number Diff line change
Expand Up @@ -419,6 +419,14 @@ class _contextvars.Context "PyContext *" "&PyContext_Type"
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=bdf87f8e0cb580e8]*/


static inline PyContext *
_PyContext_CAST(PyObject *op)
{
assert(PyObject_TypeCheck(op, &PyContext_Type));
return (PyContext *)op;
}


static inline PyContext *
_context_alloc(void)
{
Expand Down Expand Up @@ -513,37 +521,40 @@ context_tp_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
}

static int
context_tp_clear(PyContext *self)
context_tp_clear(PyObject *op)
{
PyContext *self = _PyContext_CAST(op);
Py_CLEAR(self->ctx_prev);
Py_CLEAR(self->ctx_vars);
return 0;
}

static int
context_tp_traverse(PyContext *self, visitproc visit, void *arg)
context_tp_traverse(PyObject *op, visitproc visit, void *arg)
{
PyContext *self = _PyContext_CAST(op);
Py_VISIT(self->ctx_prev);
Py_VISIT(self->ctx_vars);
return 0;
}

static void
context_tp_dealloc(PyContext *self)
context_tp_dealloc(PyObject *self)
{
_PyObject_GC_UNTRACK(self);

if (self->ctx_weakreflist != NULL) {
PyObject_ClearWeakRefs((PyObject*)self);
PyContext *ctx = _PyContext_CAST(self);
if (ctx->ctx_weakreflist != NULL) {
PyObject_ClearWeakRefs(self);
}
(void)context_tp_clear(self);

_Py_FREELIST_FREE(contexts, self, Py_TYPE(self)->tp_free);
}

static PyObject *
context_tp_iter(PyContext *self)
context_tp_iter(PyObject *op)
{
PyContext *self = _PyContext_CAST(op);
return _PyHamt_NewIterKeys(self->ctx_vars);
}

Expand Down Expand Up @@ -575,18 +586,20 @@ context_tp_richcompare(PyObject *v, PyObject *w, int op)
}

static Py_ssize_t
context_tp_len(PyContext *self)
context_tp_len(PyObject *op)
{
PyContext *self = _PyContext_CAST(op);
return _PyHamt_Len(self->ctx_vars);
}

static PyObject *
context_tp_subscript(PyContext *self, PyObject *key)
context_tp_subscript(PyObject *op, PyObject *key)
{
if (context_check_key_type(key)) {
return NULL;
}
PyObject *val = NULL;
PyContext *self = _PyContext_CAST(op);
int found = _PyHamt_Find(self->ctx_vars, key, &val);
if (found < 0) {
return NULL;
Expand All @@ -599,12 +612,13 @@ context_tp_subscript(PyContext *self, PyObject *key)
}

static int
context_tp_contains(PyContext *self, PyObject *key)
context_tp_contains(PyObject *op, PyObject *key)
{
if (context_check_key_type(key)) {
return -1;
}
PyObject *val = NULL;
PyContext *self = _PyContext_CAST(op);
return _PyHamt_Find(self->ctx_vars, key, &val);
}

Expand Down Expand Up @@ -701,7 +715,7 @@ _contextvars_Context_copy_impl(PyContext *self)


static PyObject *
context_run(PyContext *self, PyObject *const *args,
context_run(PyObject *self, PyObject *const *args,
Py_ssize_t nargs, PyObject *kwnames)
{
PyThreadState *ts = _PyThreadState_GET();
Expand All @@ -712,14 +726,14 @@ context_run(PyContext *self, PyObject *const *args,
return NULL;
}

if (_PyContext_Enter(ts, (PyObject *)self)) {
if (_PyContext_Enter(ts, self)) {
return NULL;
}

PyObject *call_result = _PyObject_VectorcallTstate(
ts, args[0], args + 1, nargs - 1, kwnames);

if (_PyContext_Exit(ts, (PyObject *)self)) {
if (_PyContext_Exit(ts, self)) {
Py_XDECREF(call_result);
return NULL;
}
Expand All @@ -739,21 +753,12 @@ static PyMethodDef PyContext_methods[] = {
};

static PySequenceMethods PyContext_as_sequence = {
0, /* sq_length */
0, /* sq_concat */
0, /* sq_repeat */
0, /* sq_item */
0, /* sq_slice */
0, /* sq_ass_item */
0, /* sq_ass_slice */
(objobjproc)context_tp_contains, /* sq_contains */
0, /* sq_inplace_concat */
0, /* sq_inplace_repeat */
.sq_contains = context_tp_contains
};

static PyMappingMethods PyContext_as_mapping = {
(lenfunc)context_tp_len, /* mp_length */
(binaryfunc)context_tp_subscript, /* mp_subscript */
.mp_length = context_tp_len,
.mp_subscript = context_tp_subscript
};

PyTypeObject PyContext_Type = {
Expand All @@ -763,13 +768,13 @@ PyTypeObject PyContext_Type = {
.tp_methods = PyContext_methods,
.tp_as_mapping = &PyContext_as_mapping,
.tp_as_sequence = &PyContext_as_sequence,
.tp_iter = (getiterfunc)context_tp_iter,
.tp_dealloc = (destructor)context_tp_dealloc,
.tp_iter = context_tp_iter,
.tp_dealloc = context_tp_dealloc,
.tp_getattro = PyObject_GenericGetAttr,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
.tp_richcompare = context_tp_richcompare,
.tp_traverse = (traverseproc)context_tp_traverse,
.tp_clear = (inquiry)context_tp_clear,
.tp_traverse = context_tp_traverse,
.tp_clear = context_tp_clear,
.tp_new = context_tp_new,
.tp_weaklistoffset = offsetof(PyContext, ctx_weakreflist),
.tp_hash = PyObject_HashNotImplemented,
Expand Down