[issue27266] Always use getrandom() in os.random() and add block=False parameter to os.urandom()

[STINNER Victor]

STINNER Victor added the comment:

I changed the title to make my intent more explicit: the goal is to make os.urandom() more secure on Linux by always using getrandom(). But always using getrandom() in os.urandom() requires a non-blocking os.urandom() to start Python: see #25420 (import random) and #26839 (hash secret) for practical issues.

I removed Python 3.5 from versions since Larry explicitly asked to not add a new parameter to os.urandom() in Python 3.5: msg267721.

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title: Add block keyword-only optional parameter to os.urandom() -> Always use getrandom() in os.random() and add block=False parameter to os.urandom()
type:  -> enhancement
versions:  -Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27266>
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