[issue11277] Crash with mmap and sparse files on Mac OS X
STINNER Victor
report at bugs.python.org
Mon May 2 16:53:19 CEST 2011
STINNER Victor <victor.stinner at haypocalc.com> added the comment:
> @haypo: Python 2.7 is absolute horror.
Oh, zlib doesn't use PY_SSIZE_T_CLEAN in Python 2.7.
11277-27.1.diff contains "# Issue #10276 - check that inputs >=4GB are handled correctly.". I don't understand this comment because the test uses a buffer of 2 GB + 2 bytes.
How is it possible to pass a buffer of 2 GB+2 bytes to crc32(), whereas it stores the size into an int. The maximum size is INT_MAX which is 2 GB-1 byte. It looks like the "i" format of PyArg_ParseTuple() doesn't check for integer overflow => issue #8651. This issue was fixed in 3.1, 3.2 and 3.3, but not in Python 2.
Should we fix Python 2.7?
- backport issue #8651
- use PY_SSIZE_T_CLEAN in zlibmodule.c
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