[Python-Dev] Changing string constants to byte arrays ([Python-checkins] r55119 - in python/branches/py3k-struni/Lib: codecs.py test/test_codecs.py)

M.-A. Lemburg mal at egenix.com
Fri May 4 15:23:35 CEST 2007

Hi Walter,

if the bytes type does turn out to be a mutable type as suggested
in PEP 358, then please make sure that no code (C code in
particular), relies on the constantness of these byte objects.

This is especially important when it comes to codecs, since
the error callback logic would allow the callback to manipulate
the byte object contents and length without the codec taking
note of this change.

I expect there to be other places in the interpreter which would
break as well.

Otherwise, you end up opening the door for segfaults and
easy DOS attacks on Python3.

Marc-Andre Lemburg

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On 2007-05-04 15:05, walter.doerwald wrote:
> Author: walter.doerwald
> Date: Fri May  4 15:05:09 2007
> New Revision: 55119
> Modified:
>    python/branches/py3k-struni/Lib/codecs.py
>    python/branches/py3k-struni/Lib/test/test_codecs.py
> Log:
> Make the BOM constants in codecs.py bytes.
> Make the buffered input for decoders a bytes object.

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