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Don't crash when assigning attributes of the GeneratorExit const singleton

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This commit is contained in:
Jeff Epler 2022-10-17 09:08:17 -05:00
parent 6e9909c65e
commit b499275bb5
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GPG Key ID: D5BF15AB975AB4DE
5 changed files with 37 additions and 5 deletions
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10
py/mpconfig.h
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@ -773,6 +773,16 @@ typedef long long mp_longint_impl_t;
#define MICROPY_WARNINGS (0)
#endif
// Whether to support chained exceptions
#ifndef MICROPY_CPYTHON_EXCEPTION_CHAIN
#define MICROPY_CPYTHON_EXCEPTION_CHAIN (0)
#endif
// Whether the statically allocated GeneratorExit exception may be const
#ifndef MICROPY_CONST_GENERATOREXIT_OBJ
#define MICROPY_CONST_GENERATOREXIT_OBJ (!MICROPY_CPYTHON_EXCEPTION_CHAIN)
#endif
// Whether to support warning categories
#ifndef MICROPY_WARNINGS_CATEGORY
#define MICROPY_WARNINGS_CATEGORY (0)

4
py/obj.h
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@ -791,7 +791,9 @@ extern const struct _mp_obj_dict_t mp_const_empty_dict_obj;
extern const struct _mp_obj_traceback_t mp_const_empty_traceback_obj;
extern const struct _mp_obj_singleton_t mp_const_ellipsis_obj;
extern const struct _mp_obj_singleton_t mp_const_notimplemented_obj;
extern const struct _mp_obj_exception_t mp_const_GeneratorExit_obj;
#if MICROPY_CONST_GENERATOREXIT_OBJ
extern const struct _mp_obj_exception_t mp_static_GeneratorExit_obj;
#endif
// Fixed empty map. Useful when calling keyword-receiving functions
// without any keywords from C, etc.

4
py/objexcept.c
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@ -218,9 +218,11 @@ void mp_obj_exception_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
mp_obj_exception_t *self = MP_OBJ_TO_PTR(self_in);
if (dest[0] != MP_OBJ_NULL) {
// store/delete attribute
if (self == &mp_const_GeneratorExit_obj) {
#if MICROPY_CONST_GENERATOREXIT_OBJ
if (self == &mp_static_GeneratorExit_obj) {
mp_raise_AttributeError(MP_ERROR_TEXT("can't set attribute"));
}
#endif
if (attr == MP_QSTR___traceback__) {
if (dest[1] == mp_const_none) {
self->traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;

19
py/objgenerator.c
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@ -38,7 +38,12 @@
#include "supervisor/shared/translate/translate.h"
// Instance of GeneratorExit exception - needed by generator.close()
const mp_obj_exception_t mp_const_GeneratorExit_obj = {{&mp_type_GeneratorExit}, (mp_obj_tuple_t *)&mp_const_empty_tuple_obj, (mp_obj_traceback_t *)&mp_const_empty_traceback_obj};
#if MICROPY_CONST_GENERATOREXIT_OBJ
const
#else
static
#endif
mp_obj_exception_t mp_static_GeneratorExit_obj = {{&mp_type_GeneratorExit}, (mp_obj_tuple_t *)&mp_const_empty_tuple_obj, (mp_obj_traceback_t *)&mp_const_empty_traceback_obj};
/******************************************************************************/
/* generator wrapper */
@ -362,9 +367,19 @@ STATIC mp_obj_t gen_instance_throw(size_t n_args, const mp_obj_t *args) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(gen_instance_throw_obj, 2, 4, gen_instance_throw);
static mp_obj_t generatorexit(void) {
#if MICROPY_CPYTHON_EXCEPTION_CHAIN
MP_STATIC_ASSERT(!MICROPY_CONST_GENERATOREXIT_OBJ);
mp_static_GeneratorExit_obj.context = NULL;
mp_static_GeneratorExit_obj.cause = NULL;
mp_static_GeneratorExit_obj.suppress_context = false;
#endif
return MP_OBJ_FROM_PTR(&mp_static_GeneratorExit_obj);
}
STATIC mp_obj_t gen_instance_close(mp_obj_t self_in) {
mp_obj_t ret;
switch (mp_obj_gen_resume(self_in, mp_const_none, MP_OBJ_FROM_PTR(&mp_const_GeneratorExit_obj), &ret)) {
switch (mp_obj_gen_resume(self_in, mp_const_none, generatorexit(), &ret)) {
case MP_VM_RETURN_YIELD:
mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("generator ignored GeneratorExit"));

5
py/vm.c
View File

@ -1391,7 +1391,10 @@ unwind_loop:
// - constant GeneratorExit object, because it's const
// - exceptions re-raised by END_FINALLY
// - exceptions re-raised explicitly by "raise"
if (nlr.ret_val != &mp_const_GeneratorExit_obj
if ( true
#if MICROPY_CONST_GENERATOREXIT_OBJ
&& nlr.ret_val != &mp_static_GeneratorExit_obj
#endif
&& *code_state->ip != MP_BC_END_FINALLY
&& *code_state->ip != MP_BC_RAISE_LAST) {
const byte *ip = code_state->fun_bc->bytecode;