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Don't allow __lazy_imports__ to work in try/except

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Dino Viehland 2025-10-02 13:21:05 -07:00
parent c8c8838b1c
commit 7c494053b0
5 changed files with 66 additions and 73 deletions
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110
Python/ceval.c
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@ -2986,81 +2986,10 @@ _PyEval_SliceIndexNotNone(PyObject *v, Py_ssize_t *pi)
return 1;
}
int
check_lazy_import_comatibility(PyThreadState *tstate, PyObject *lazy_modules,
PyObject *builtins, PyObject *globals, PyObject *locals,
PyObject *name, PyObject *fromlist, PyObject *level,
PyObject **mod)
{
int ilevel = PyLong_AsInt(level);
if (ilevel == -1 && _PyErr_Occurred(tstate)) {
return -1;
}
PyObject *abs_name = _PyImport_GetAbsName(tstate, name, globals, ilevel);
if (abs_name == NULL) {
return -1;
}
int contains = PySequence_Contains(lazy_modules, abs_name);
Py_DECREF(abs_name);
if (contains < 0) {
return -1;
} else if (contains == 0) {
*mod = NULL;
return 0;
}
_PyInterpreterFrame *frame = _PyEval_GetFrame();
if (frame == NULL) {
PyErr_SetString(PyExc_RuntimeError, "no current frame");
return -1;
}
PyObject *import_func;
if (PyMapping_GetOptionalItem(frame->f_builtins, &_Py_ID(__import__), &import_func) < 0) {
return -1;
}
if (import_func == NULL) {
_PyErr_SetString(tstate, PyExc_ImportError, "__import__ not found");
return -1;
}
PyObject *final_mod = _PyImport_LazyImportModuleLevelObject(tstate, name, import_func, globals,
locals, fromlist, ilevel);
Py_DECREF(import_func);
if (final_mod == NULL) {
return -1;
}
*mod = final_mod;
return 0;
}
PyObject *
_PyEval_ImportName(PyThreadState *tstate, PyObject *builtins, PyObject *globals, PyObject *locals,
PyObject *name, PyObject *fromlist, PyObject *level)
{
// Check if this module should be imported lazily due to the compatbility mode support via
// __lazy_modules__.
PyObject *lazy_modules;
if (globals != NULL &&
PyMapping_GetOptionalItem(globals, &_Py_ID(__lazy_modules__), &lazy_modules) < 0) {
return NULL;
}
PyObject *res;
if (lazy_modules != NULL) {
int lazy = check_lazy_import_comatibility(tstate, lazy_modules, builtins, globals,
locals, name, fromlist, level, &res);
Py_DECREF(lazy_modules);
if (lazy < 0) {
return NULL;
} else if (res != NULL) {
return res;
}
}
PyObject *import_func;
if (PyMapping_GetOptionalItem(builtins, &_Py_ID(__import__), &import_func) < 0) {
return NULL;
@ -3070,7 +2999,7 @@ _PyEval_ImportName(PyThreadState *tstate, PyObject *builtins, PyObject *globals,
return NULL;
}
res = _PyEval_ImportNameWithImport(tstate, import_func, globals, locals, name, fromlist, level);
PyObject *res = _PyEval_ImportNameWithImport(tstate, import_func, globals, locals, name, fromlist, level);
Py_DECREF(import_func);
return res;
}
@ -3102,10 +3031,37 @@ _PyEval_ImportNameWithImport(PyThreadState *tstate, PyObject *import_func, PyObj
return res;
}
int
check_lazy_import_comatibility(PyThreadState *tstate, PyObject *globals,
PyObject *name, PyObject *level)
{
// Check if this module should be imported lazily due to the compatbility mode support via
// __lazy_modules__.
PyObject *lazy_modules = NULL;
if (globals != NULL &&
PyMapping_GetOptionalItem(globals, &_Py_ID(__lazy_modules__), &lazy_modules) < 0) {
return -1;
} else if (lazy_modules == NULL) {
return 0;
}
int ilevel = PyLong_AsInt(level);
if (ilevel == -1 && _PyErr_Occurred(tstate)) {
return -1;
}
PyObject *abs_name = _PyImport_GetAbsName(tstate, name, globals, ilevel);
if (abs_name == NULL) {
return -1;
}
return PySequence_Contains(lazy_modules, abs_name);
}
PyObject *
_PyEval_LazyImportName(PyThreadState *tstate, PyObject *builtins, PyObject *globals,
PyObject *locals, PyObject *name, PyObject *fromlist, PyObject *level, int lazy)
PyObject *locals, PyObject *name, PyObject *fromlist, PyObject *level,
int lazy)
{
PyObject *res = NULL;
// Check if global policy overrides the local syntax
@ -3120,6 +3076,14 @@ _PyEval_LazyImportName(PyThreadState *tstate, PyObject *builtins, PyObject *glob
break;
}
if (!lazy) {
// see if __lazy_imports__ forces this to be lazy
lazy = check_lazy_import_comatibility(tstate, globals, name, level);
if (lazy < 0) {
return NULL;
}
}
if (!lazy) {
// Not a lazy import or lazy imports are disabled, fallback to the regular import
return _PyEval_ImportName(tstate, builtins, globals, locals, name, fromlist, level);