[issue15452] Improve the security model for logging listener()

[Roundup Robot]

Roundup Robot added the comment:

New changeset fe1804387687 by R David Murray in branch 'default':
whatsnew: logging.config.listen *verify* (#15452).
http://hg.python.org/cpython/rev/fe1804387687

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<http://bugs.python.org/issue15452>
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