Remove contrived test

Author: picnixz

Lib/test/test_asyncio/test_tasks.py

@@ -19,7 +19,6 @@
 from asyncio import tasks
 from test.test_asyncio import utils as test_utils
 from test import support
-from test.support import ReachableCode
 from test.support.script_helper import assert_python_ok
 from test.support.warnings_helper import ignore_warnings
 
@@ -2711,76 +2710,6 @@ def __str__(self):
 
         self.assertEqual(sys.getrefcount(obj), initial_refcount)
 
-    def test_use_after_free_on_task_call_step_soon_with_ridiculous_setup(self):
-        # Special thanks to Nico-Posada for the original PoC.
-        # see: https://github.com/python/cpython/issues/126080
-        asserter = self
-
-        class Break:
-            def __str__(self):
-                # to break recursion errors in Task.__init__
-                raise ReachableCode(type(self))
-
-        class EvilEventLoop:
-            get_debug = staticmethod(lambda: False)
-            is_running = staticmethod(lambda: True)
-
-            def call_soon(self, *args, **kwargs):
-                # raise an exception just to make sure this was called
-                raise ReachableCode(type(self))
-
-            def __getattribute__(self, name):
-                if name == "call_soon":
-                    with asserter.assertRaises(ReachableCode) as cm:
-                        # The context must be set to `None` for it to use
-                        # Py_XSETREF instead of a plain regular assignment.
-                        evil_task.__init__(evil_coro, loop=self, name=Break())
-                    asserter.assertEqual(len(cm.exception.args), 1)
-                    asserter.assertIs(cm.exception.args[0], Break)
-                return object.__getattribute__(self, name)
-
-        class TaskWakeupCatch:
-            _asyncio_future_blocking = True
-            get_loop = staticmethod(lambda: evil_loop)
-            task_wakeup_method = None
-
-            def add_done_callback(self, callback, *args, **kwargs):
-                # Retrieve the 'task_wakeup' method of the Task object
-                # which is not accessible from pure Python code.
-                if self.task_wakeup_method is None:
-                    self.task_wakeup_method = callback
-
-        catcher = TaskWakeupCatch()
-
-        # We want a synchronous generator wrapped in a coroutine function
-        # and not an asynchronous generator defined via 'async def'.
-        async def evil_coroutine():
-            @types.coroutine
-            def sync_generator():
-                # ensure to keep catcher alive after the first send() call
-                nonlocal catcher
-                while 1:
-                    yield catcher
-            await sync_generator()
-
-        evil_coro = evil_coroutine()
-        evil_loop = EvilEventLoop()
-
-        self.assertIsNone(catcher.task_wakeup_method)
-        evil_task = self.new_task(evil_loop, evil_coro, eager_start=True)
-        self.assertIsInstance(catcher.task_wakeup_method, types.BuiltinMethodType)
-
-        with asserter.assertRaises(ReachableCode) as cm:
-            evil_task.__init__(evil_coro, loop=evil_loop, name=Break())
-        self.assertEqual(len(cm.exception.args), 1)
-        self.assertIs(cm.exception.args[0], Break)
-
-        self.assertIsInstance(catcher.task_wakeup_method, types.BuiltinMethodType)
-        with self.assertRaises(ReachableCode) as cm:
-            catcher.task_wakeup_method(mock.Mock())
-        self.assertEqual(len(cm.exception.args), 1)
-        self.assertIs(cm.exception.args[0], EvilEventLoop)
-
 
 def add_subclass_tests(cls):
     BaseTask = cls.Task
@@ -2956,9 +2885,6 @@ class PyTask_CFutureSubclass_Tests(BaseTaskTests, test_utils.TestCase):
     Task = tasks._PyTask
     all_tasks = tasks._py_all_tasks
 
-    def test_use_after_free_on_task_call_step_soon_with_ridiculous_setup(self):
-        self.skipTest("Python implementation is safe")
-
 
 @unittest.skipUnless(hasattr(tasks, '_CTask'),
                      'requires the C _asyncio module')
@@ -2977,9 +2903,6 @@ class PyTask_CFuture_Tests(BaseTaskTests, test_utils.TestCase):
     Future = getattr(futures, '_CFuture', None)
     all_tasks = staticmethod(tasks._py_all_tasks)
 
-    def test_use_after_free_on_task_call_step_soon_with_ridiculous_setup(self):
-        self.skipTest("Python implementation is safe")
-
 
 class PyTask_PyFuture_Tests(BaseTaskTests, SetMethodsTest,
                             test_utils.TestCase):
@@ -2988,18 +2911,12 @@ class PyTask_PyFuture_Tests(BaseTaskTests, SetMethodsTest,
     Future = futures._PyFuture
     all_tasks = staticmethod(tasks._py_all_tasks)
 
-    def test_use_after_free_on_task_call_step_soon_with_ridiculous_setup(self):
-        self.skipTest("Python implementation is safe")
-
 
 @add_subclass_tests
 class PyTask_PyFuture_SubclassTests(BaseTaskTests, test_utils.TestCase):
     Task = tasks._PyTask
     Future = futures._PyFuture
 
-    def test_use_after_free_on_task_call_step_soon_with_ridiculous_setup(self):
-        self.skipTest("Python implementation is safe")
-
 
 @unittest.skipUnless(hasattr(tasks, '_CTask'),
                      'requires the C _asyncio module')