[issue23908] Check path arguments of os functions for null character

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I afraid not that builbots will fail, but that that test could pass without the fix. Tests should be tested without applying the fix. Writing right tests can require several iterations with running tests on patched and unpatched the os module.

Here is a patch with tests.

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Added file: http://bugs.python.org/file38984/path_converter_null_char_2.patch

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