Created on 2012-03-06 18:00 by fijall, last changed 2012-03-07 21:01 by benjamin.peterson. This issue is now closed.
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| x.py | fijall, 2012-03-06 18:00 | |||
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| msg155028 - (view) | Author: Maciej Fijalkowski (fijall) *  |
Date: 2012-03-06 18:00 | |
Example to get a segfault attached. Crashes under python3 as well. |
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| msg155033 - (view) | Author: Matthew Barnett (mrabarnett) * | Date: 2012-03-06 19:09 | |
It segfaults because it attempts to access the buffer of an mmap that has been closed. It would be certainly be more friendly if it checked whether the mmap was still open and, if not, raised an exception instead. |
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| msg155105 - (view) | Author: Matthew Barnett (mrabarnett) * | Date: 2012-03-07 18:58 | |
In the function "getstring" in _sre.c, the code obtains a pointer to the characters of the buffer and then releases the buffer.
There's a comment before the release:
/* Release the buffer immediately --- possibly dangerous
but doing something else would require some re-factoring
*/
PyBuffer_Release(&view);
What's happening is that after the mmap is closed the pointer is no longer valid.
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| msg155121 - (view) | Author: Roundup Robot (python-dev) | Date: 2012-03-07 20:59 | |
New changeset 10a79a33d09b by Benjamin Peterson in branch '3.2': keep the buffer object around while we're using it (closes #14212) http://hg.python.org/cpython/rev/10a79a33d09b New changeset 17dfe24e5107 by Benjamin Peterson in branch 'default': merge 3.2 (#14212) http://hg.python.org/cpython/rev/17dfe24e5107 |
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| msg155122 - (view) | Author: Benjamin Peterson (benjamin.peterson) * |
Date: 2012-03-07 21:00 | |
I think 2.7 might be hopeless. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2013-08-05 13:08:04 | serhiy.storchaka | link | issue13083 superseder |
| 2012-03-07 21:01:36 | benjamin.peterson | set | status: open -> closed resolution: fixed |
| 2012-03-07 21:00:15 | benjamin.peterson | set | status: closed -> open nosy: + benjamin.peterson messages: + msg155122 resolution: fixed -> (no value) stage: resolved -> |
| 2012-03-07 20:59:27 | python-dev | set | status: open -> closed nosy: + python-dev messages: + msg155121 resolution: fixed stage: resolved |
| 2012-03-07 19:23:17 | skrah | set | nosy:
+ skrah |
| 2012-03-07 19:01:36 | alex | set | nosy:
+ alex |
| 2012-03-07 18:58:12 | mrabarnett | set | messages: + msg155105 |
| 2012-03-06 19:09:31 | mrabarnett | set | nosy:
+ mrabarnett messages: + msg155033 |
| 2012-03-06 18:00:15 | fijall | create | |