Message 24842 - Python tracker

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Author	arigo
Recipients
Date	2005-04-01.09:22:14
SpamBayes Score
Marked as misclassified
Message-id
In-reply-to

Content
class X(types.ModuleType, str): pass X('name') -> segfault This buggy subclassing goes through typeobject.c's checks because PyModuleObject looks exactly like a user-defined subclass of 'object': it has a PyObject_HEAD followed only by the dict, as specified by tp_dictoffset. A fix would be to forbid any subclassing to move the tp_dictoffset of a non-heap type.

class X(types.ModuleType, str): pass
X('name')
-> segfault

This buggy subclassing goes through typeobject.c's checks because PyModuleObject looks exactly like a user-defined subclass of 'object': it has a PyObject_HEAD followed only by the dict, as specified by tp_dictoffset.

A fix would be to forbid any subclassing to move the tp_dictoffset of a non-heap type.

History
Date	User	Action	Args
2007-08-23 14:30:39	admin	link	issue1174712 messages
2007-08-23 14:30:39	admin	create