[issue19619] Blacklist base64, hex, ... codecs from bytes.decode() and str.encode()

[Nick Coghlan]

Nick Coghlan added the comment:

Backporting just the encode/decode changes sounds reasonable to me, since open() isn't likely to be a DoS vector in this particular case.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19619>
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