New submission from STINNER Victor <victor.stin...@haypocalc.com>:
sys.setfilesystemencoding() doesn't check if the argument is a valid encoding
name.
If the filesystem encoding is invalid, open("a") goes into an unlimited loop.
The default recursion limit is 1000, but the example crash at 930: too bad :-)
Each loop allocate ~9000 bytes: Linux creates a 8 MB stack by default, and so
~9000x930 uses all the stack.
Using a lower recursion limit, we can see the loop:
----------
$ ./python -c 'import sys; sys.setrecursionlimit(30);
sys.setfilesystemencoding("xxx"); open("x")'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 98, in
search_function
level=0)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 83, in
search_function
norm_encoding = normalize_encoding(encoding)
File "/home/SHARE/SVN/py3k/Lib/encodings/__init__.py", line 55, in
normalize_encoding
if isinstance(encoding, bytes):
RuntimeError: maximum recursion depth exceeded while calling a Python object
----------
----------
components: Interpreter Core
messages: 101656
nosy: haypo
severity: normal
status: open
title: sys.setfilesystemencoding("xxx"); open("a") => stack overflow
type: crash
versions: Python 3.1, Python 3.2, Python 3.3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8226>
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