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gh-111178: fix UBSan failures in Modules/_threadmodule.c #129794

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Merged
encukou merged 12 commits into from
Feb 24, 2025
Merged

gh-111178: fix UBSan failures in Modules/_threadmodule.c #129794

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9447294
fix UBSan failures for `PyThreadHandleObject`
picnixz Jan 25, 2025
1083c46
use a macro for casts to `lockobject`
picnixz Jan 25, 2025
d7a39ae
fix UBSan failures for `rlockobject`
picnixz Jan 25, 2025
557dbd0
fix UBSan failures for `localdummyobject`
picnixz Jan 25, 2025
a96a296
fix UBSan failures for `localobject`
picnixz Jan 25, 2025
339a416
add safe casts
picnixz Jan 25, 2025
17ba461
cleanup module functions
picnixz Jan 25, 2025
4b3e706
use semantically correct parameter names
picnixz Feb 6, 2025
122f2ee
Merge remote-tracking branch 'upstream/main' into fix/ubsan/thread-11…
picnixz Feb 7, 2025
7a5ed41
Do Do not use `_` + capital letter in new code as it is also UB.
picnixz Feb 8, 2025
ce0eb11
Do not add an underscore to the macro if none is needed.
picnixz Feb 8, 2025
59a33e3
Merge branch 'main' into fix/ubsan/thread-111178
encukou Feb 18, 2025
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fix UBSan failures for rlockobject
  • Loading branch information
@picnixz
picnixz committed Jan 25, 2025
commit d7a39aea69ec950ade1332dd52426c43e862df3a
29 changes: 15 additions & 14 deletions Modules/_threadmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -991,20 +991,21 @@ typedef struct {
_PyRecursiveMutex lock;
} rlockobject;

#define _rlockobject_CAST(op) ((rlockobject *)(op))

static int
rlock_traverse(rlockobject *self, visitproc visit, void *arg)
rlock_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
}


static void
rlock_dealloc(PyObject *op)
rlock_dealloc(PyObject *self)
{
rlockobject *self = (rlockobject*)op;
PyObject_GC_UnTrack(self);
PyObject_ClearWeakRefs((PyObject *) self);
PyObject_ClearWeakRefs(self);
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free(self);
Py_DECREF(tp);
Expand All @@ -1014,7 +1015,7 @@ rlock_dealloc(PyObject *op)
static PyObject *
rlock_acquire(PyObject *op, PyObject *args, PyObject *kwds)
{
rlockobject *self = (rlockobject*)op;
rlockobject *self = _rlockobject_CAST(op);
PyTime_t timeout;

if (lock_acquire_parse_args(args, kwds, &timeout) < 0) {
Expand Down Expand Up @@ -1056,8 +1057,7 @@ Lock the lock.");
static PyObject *
rlock_release(PyObject *op, PyObject *Py_UNUSED(ignored))
{
rlockobject *self = (rlockobject*)op;

rlockobject *self = _rlockobject_CAST(op);
if (_PyRecursiveMutex_TryUnlock(&self->lock) < 0) {
PyErr_SetString(PyExc_RuntimeError,
"cannot release un-acquired lock");
Expand Down Expand Up @@ -1088,7 +1088,7 @@ Release the lock.");
static PyObject *
rlock_acquire_restore(PyObject *op, PyObject *args)
{
rlockobject *self = (rlockobject*)op;
rlockobject *self = _rlockobject_CAST(op);
PyThread_ident_t owner;
Py_ssize_t count;

Expand All @@ -1111,7 +1111,7 @@ For internal use by `threading.Condition`.");
static PyObject *
rlock_release_save(PyObject *op, PyObject *Py_UNUSED(ignored))
{
rlockobject *self = (rlockobject*)op;
rlockobject *self = _rlockobject_CAST(op);

if (!_PyRecursiveMutex_IsLockedByCurrentThread(&self->lock)) {
PyErr_SetString(PyExc_RuntimeError,
Expand All @@ -1135,7 +1135,7 @@ For internal use by `threading.Condition`.");
static PyObject *
rlock_recursion_count(PyObject *op, PyObject *Py_UNUSED(ignored))
{
rlockobject *self = (rlockobject*)op;
rlockobject *self = _rlockobject_CAST(op);
if (_PyRecursiveMutex_IsLockedByCurrentThread(&self->lock)) {
return PyLong_FromSize_t(self->lock.level + 1);
}
Expand All @@ -1151,7 +1151,7 @@ For internal use by reentrancy checks.");
static PyObject *
rlock_is_owned(PyObject *op, PyObject *Py_UNUSED(ignored))
{
rlockobject *self = (rlockobject*)op;
rlockobject *self = _rlockobject_CAST(op);
long owned = _PyRecursiveMutex_IsLockedByCurrentThread(&self->lock);
return PyBool_FromLong(owned);
}
Expand All @@ -1176,7 +1176,7 @@ rlock_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
static PyObject *
rlock_repr(PyObject *op)
{
rlockobject *self = (rlockobject*)op;
rlockobject *self = _rlockobject_CAST(op);
PyThread_ident_t owner = self->lock.thread;
size_t count = self->lock.level + 1;
return PyUnicode_FromFormat(
Expand All @@ -1189,8 +1189,9 @@ rlock_repr(PyObject *op)

#ifdef HAVE_FORK
static PyObject *
rlock__at_fork_reinit(rlockobject *self, PyObject *Py_UNUSED(args))
rlock__at_fork_reinit(PyObject *op, PyObject *Py_UNUSED(args))
{
rlockobject *self = _rlockobject_CAST(op);
self->lock = (_PyRecursiveMutex){0};
Py_RETURN_NONE;
}
Expand All @@ -1215,7 +1216,7 @@ static PyMethodDef rlock_methods[] = {
{"__exit__", rlock_release,
METH_VARARGS, rlock_exit_doc},
#ifdef HAVE_FORK
{"_at_fork_reinit", (PyCFunction)rlock__at_fork_reinit,
{"_at_fork_reinit", rlock__at_fork_reinit,
METH_NOARGS, NULL},
#endif
{NULL, NULL} /* sentinel */
Expand Down