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gh-111178: fix UBSan failures in Modules/_decimal #129074

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Merged
merged 6 commits into from
Jan 27, 2025
Merged

gh-111178: fix UBSan failures in Modules/_decimal #129074

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8b55a0f
Introduce cast macros
picnixz Jan 20, 2025
1bed6f6
fix UBSan failures for `PyDecContextObject`
picnixz Jan 20, 2025
f0f5b73
fix UBSan failures for `PyDecContextManagerObject`
picnixz Jan 20, 2025
8f8ecba
remove redundant casts for `PyDecObject`
picnixz Jan 20, 2025
f44421a
use macros for `PyDecSignalDictObject`
picnixz Jan 20, 2025
692cede
use macros for `PyDecObject`
picnixz Jan 20, 2025
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79 changes: 44 additions & 35 deletions Modules/_decimal/_decimal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -178,11 +178,15 @@ typedef struct {
mpd_uint_t data[_Py_DEC_MINALLOC];
} PyDecObject;

#define _PyDecObject_CAST(op) ((PyDecObject *)(op))

typedef struct {
PyObject_HEAD
uint32_t *flags;
} PyDecSignalDictObject;

#define _PyDecSignalDictObject_CAST(op) ((PyDecSignalDictObject *)(op))

typedef struct PyDecContextObject {
PyObject_HEAD
mpd_context_t ctx;
Expand All @@ -193,23 +197,27 @@ typedef struct PyDecContextObject {
decimal_state *modstate;
} PyDecContextObject;

#define _PyDecContextObject_CAST(op) ((PyDecContextObject *)(op))

typedef struct {
PyObject_HEAD
PyObject *local;
PyObject *global;
} PyDecContextManagerObject;

#define _PyDecContextManagerObject_CAST(op) ((PyDecContextManagerObject *)(op))

#undef MPD
#undef CTX
#define PyDec_CheckExact(st, v) Py_IS_TYPE(v, (st)->PyDec_Type)
#define PyDec_Check(st, v) PyObject_TypeCheck(v, (st)->PyDec_Type)
#define PyDecSignalDict_Check(st, v) Py_IS_TYPE(v, (st)->PyDecSignalDict_Type)
#define PyDecContext_Check(st, v) PyObject_TypeCheck(v, (st)->PyDecContext_Type)
#define MPD(v) (&((PyDecObject *)v)->dec)
#define SdFlagAddr(v) (((PyDecSignalDictObject *)v)->flags)
#define SdFlags(v) (*((PyDecSignalDictObject *)v)->flags)
#define CTX(v) (&((PyDecContextObject *)v)->ctx)
#define CtxCaps(v) (((PyDecContextObject *)v)->capitals)
#define MPD(v) (&_PyDecObject_CAST(v)->dec)
#define SdFlagAddr(v) (_PyDecSignalDictObject_CAST(v)->flags)
#define SdFlags(v) (*_PyDecSignalDictObject_CAST(v)->flags)
#define CTX(v) (&_PyDecContextObject_CAST(v)->ctx)
#define CtxCaps(v) (_PyDecContextObject_CAST(v)->capitals)

static inline decimal_state *
get_module_state_from_ctx(PyObject *v)
Expand Down Expand Up @@ -1413,24 +1421,26 @@ context_new(PyTypeObject *type,
}

static int
context_traverse(PyDecContextObject *self, visitproc visit, void *arg)
context_traverse(PyObject *op, visitproc visit, void *arg)
{
PyDecContextObject *self = _PyDecContextObject_CAST(op);
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->traps);
Py_VISIT(self->flags);
return 0;
}

static int
context_clear(PyDecContextObject *self)
context_clear(PyObject *op)
{
PyDecContextObject *self = _PyDecContextObject_CAST(op);
Py_CLEAR(self->traps);
Py_CLEAR(self->flags);
return 0;
}

static void
context_dealloc(PyDecContextObject *self)
context_dealloc(PyObject *self)
{
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
Expand Down Expand Up @@ -1473,15 +1483,15 @@ context_init(PyObject *self, PyObject *args, PyObject *kwds)
}

static PyObject *
context_repr(PyDecContextObject *self)
context_repr(PyObject *self)
{
mpd_context_t *ctx;
char flags[MPD_MAX_SIGNAL_LIST];
char traps[MPD_MAX_SIGNAL_LIST];
int n, mem;

#ifdef Py_DEBUG
decimal_state *state = get_module_state_from_ctx((PyObject *)self);
decimal_state *state = get_module_state_from_ctx(self);
assert(PyDecContext_Check(state, self));
#endif
ctx = CTX(self);
Expand All @@ -1501,7 +1511,7 @@ context_repr(PyDecContextObject *self)
"Context(prec=%zd, rounding=%s, Emin=%zd, Emax=%zd, "
"capitals=%d, clamp=%d, flags=%s, traps=%s)",
ctx->prec, mpd_round_string[ctx->round], ctx->emin, ctx->emax,
self->capitals, ctx->clamp, flags, traps);
CtxCaps(self), ctx->clamp, flags, traps);
}

static void
Expand Down Expand Up @@ -1621,16 +1631,16 @@ context_reduce(PyObject *self, PyObject *Py_UNUSED(dummy))

static PyGetSetDef context_getsets [] =
{
{ "prec", (getter)context_getprec, (setter)context_setprec, NULL, NULL},
{ "Emax", (getter)context_getemax, (setter)context_setemax, NULL, NULL},
{ "Emin", (getter)context_getemin, (setter)context_setemin, NULL, NULL},
{ "rounding", (getter)context_getround, (setter)context_setround, NULL, NULL},
{ "capitals", (getter)context_getcapitals, (setter)context_setcapitals, NULL, NULL},
{ "clamp", (getter)context_getclamp, (setter)context_setclamp, NULL, NULL},
{ "prec", context_getprec, context_setprec, NULL, NULL},
{ "Emax", context_getemax, context_setemax, NULL, NULL},
{ "Emin", context_getemin, context_setemin, NULL, NULL},
{ "rounding", context_getround, context_setround, NULL, NULL},
{ "capitals", context_getcapitals, context_setcapitals, NULL, NULL},
{ "clamp", context_getclamp, context_setclamp, NULL, NULL},
#ifdef EXTRA_FUNCTIONALITY
{ "_allcr", (getter)context_getallcr, (setter)context_setallcr, NULL, NULL},
{ "_traps", (getter)context_gettraps, (setter)context_settraps, NULL, NULL},
{ "_flags", (getter)context_getstatus, (setter)context_setstatus, NULL, NULL},
{ "_allcr", context_getallcr, context_setallcr, NULL, NULL},
{ "_traps", context_gettraps, context_settraps, NULL, NULL},
{ "_flags", context_getstatus, context_setstatus, NULL, NULL},
#endif
{NULL}
};
Expand Down Expand Up @@ -1946,39 +1956,39 @@ ctxmanager_new(PyObject *m, PyObject *args, PyObject *kwds)
}

static int
ctxmanager_traverse(PyDecContextManagerObject *self, visitproc visit,
void *arg)
ctxmanager_traverse(PyObject *op, visitproc visit, void *arg)
{
PyDecContextManagerObject *self = _PyDecContextManagerObject_CAST(op);
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->local);
Py_VISIT(self->global);
return 0;
}

static int
ctxmanager_clear(PyDecContextManagerObject *self)
ctxmanager_clear(PyObject *op)
{
PyDecContextManagerObject *self = _PyDecContextManagerObject_CAST(op);
Py_CLEAR(self->local);
Py_CLEAR(self->global);
return 0;
}

static void
ctxmanager_dealloc(PyDecContextManagerObject *self)
ctxmanager_dealloc(PyObject *self)
{
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
(void)ctxmanager_clear(self);
tp->tp_free((PyObject *)self);
tp->tp_free(self);
Py_DECREF(tp);
}

static PyObject *
ctxmanager_set_local(PyDecContextManagerObject *self,
PyObject *Py_UNUSED(dummy))
ctxmanager_set_local(PyObject *op, PyObject *Py_UNUSED(dummy))
{
PyObject *ret;

PyDecContextManagerObject *self = _PyDecContextManagerObject_CAST(op);
ret = PyDec_SetCurrentContext(PyType_GetModule(Py_TYPE(self)), self->local);
if (ret == NULL) {
return NULL;
Expand All @@ -1989,11 +1999,10 @@ ctxmanager_set_local(PyDecContextManagerObject *self,
}

static PyObject *
ctxmanager_restore_global(PyDecContextManagerObject *self,
PyObject *Py_UNUSED(args))
ctxmanager_restore_global(PyObject *op, PyObject *Py_UNUSED(args))
{
PyObject *ret;

PyDecContextManagerObject *self = _PyDecContextManagerObject_CAST(op);
ret = PyDec_SetCurrentContext(PyType_GetModule(Py_TYPE(self)), self->global);
if (ret == NULL) {
return NULL;
Expand All @@ -2005,8 +2014,8 @@ ctxmanager_restore_global(PyDecContextManagerObject *self,


static PyMethodDef ctxmanager_methods[] = {
{"__enter__", (PyCFunction)ctxmanager_set_local, METH_NOARGS, NULL},
{"__exit__", (PyCFunction)ctxmanager_restore_global, METH_VARARGS, NULL},
{"__enter__", ctxmanager_set_local, METH_NOARGS, NULL},
{"__exit__", ctxmanager_restore_global, METH_VARARGS, NULL},
{NULL, NULL}
};

Expand Down Expand Up @@ -5021,8 +5030,8 @@ dec_imag(PyObject *self, void *Py_UNUSED(closure))

static PyGetSetDef dec_getsets [] =
{
{ "real", (getter)dec_real, NULL, NULL, NULL},
{ "imag", (getter)dec_imag, NULL, NULL, NULL},
{ "real", dec_real, NULL, NULL, NULL},
{ "imag", dec_imag, NULL, NULL, NULL},
{NULL}
};

Expand Down
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