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Author Colm Buckley
Recipients Colm Buckley, Lukasa, alex, christian.heimes, doko, dstufft, larry, lemburg, martin.panter, matejcik, ned.deily, python-dev, rhettinger, skrah, thomas-petazzoni, vstinner, ztane
Date 2016-06-07.18:55:37
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To clarify what the various patches do:

3.5.1 as released: os.urandom and hash secret initialization both attempt getrandom() in preference to reading /dev/urandom. Under certain circumstances, this will block, possibly indefinitely.

Changeset 9de508dc4837: both os.urandom and hash secret initialization call getrandom() in nonblocking mode, falling back to (possibly low-entropy) /dev/urandom should getrandom() block due to lack of entropy.

Changeset 9de508dc4837 + nonblocking_urandom_noraise.patch: hash secret initialization calls getrandom() in nonblocking mode (ie: will always succeed, although with a silent fallback to low-entropy data if called when the system has no entropy). os.urandom will always block until there's enough entropy.

I think this final case implements what you need for the 3.5.2 RC.

The issue of "import random" still needs to be resolved; maybe we should de-merge #25420 and pursue Donald's approach there.


Date User Action Args
2016-06-07 18:55:37Colm Buckleysetrecipients: + Colm Buckley, lemburg, rhettinger, doko, vstinner, larry, christian.heimes, matejcik, ned.deily, alex, skrah, python-dev, martin.panter, ztane, dstufft, Lukasa, thomas-petazzoni
2016-06-07 18:55:37Colm Buckleysetmessageid: <>
2016-06-07 18:55:37Colm Buckleylinkissue26839 messages
2016-06-07 18:55:37Colm Buckleycreate