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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"create_builtin() in _imp module trigger segfault if taking a builtin object as input","articleBody":"\u003c!--\r\n  Use this template for hard crashes of the interpreter, segmentation faults, failed C-level assertions, and similar.\r\n  Do not submit this form if you encounter an exception being unexpectedly raised from a Python function.\r\n  Most of the time, these should be filed as bugs, rather than crashes.\r\n\r\n  The CPython interpreter is itself written in a different programming language, C.\r\n  For CPython, a \"crash\" is when Python itself fails, leading to a traceback in the C stack.\r\n--\u003e\r\n\r\n# Crash report\r\nIn the following test program, _imp.create_builtin takes a object A as input. The object instance the name attribute as \"self\" at \"self.name = self\". This action triggers a segfault on CPython 3.10.7 and CPython 3.10.7. Similarly, if self.name = other keywords, e.g.,int, print, the program also crashes. It may need a checker for  _imp.create_builtin to avoid keywords.\r\n\r\n\r\n```\r\nimport _imp\r\n\r\nclass FakeSpec:\r\n\tdef __init__(self, name):\r\n\t\tself.name = self\r\n\r\nA = FakeSpec(\"time\")\r\n\r\nimp_time = _imp.create_builtin(A)\r\n```\r\n\r\n\r\n# Error messages\r\n\r\n\r\nExpected behavior on CPython 3.9.0\r\n```\r\nTraceback (most recent call last):\r\n  File \"/home/xxm/Desktop/imp.py\", line 9, in \u003cmodule\u003e\r\n    imp_time = _imp.create_builtin(A)\r\nTypeError: bad argument type for built-in operation\r\n```\r\n\r\nUnexpected Behavior on CPython 3.10.8\r\nSegmentation fault(core dumped)  \r\n\r\n# Your environment\r\n\r\n\u003c!-- Include as many relevant details as possible about the environment you experienced the bug in --\u003e\r\n\r\n- CPython versions tested on:Python 3.10.8, Python 3.10.7\r\n\r\n- Operating system and architecture: [GCC 7.5.0] on linux\r\n\r\n\u003c!--\r\nYou can freely edit this text. Remove any lines you believe are unnecessary.\r\n--\u003e\r\n","author":{"url":"https://github.com/xiaxinmeng","@type":"Person","name":"xiaxinmeng"},"datePublished":"2022-10-17T11:56:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/98354/cpython/issues/98354"}