Message 264303 - Python tracker

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Author	lemburg
Recipients	doko, lemburg, matejcik, rhettinger, skrah, socketpair, thomas-petazzoni, vstinner
Date	2016-04-26.15:11:14
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1461683474.82.0.840363872775.issue26839@psf.upfronthosting.co.za>
In-reply-to

Content
As mentioned on the other issue #25420, this is a regression and a change in documented behavior of os.urandom(), which is expected to be non-blocking, regardless of whether entropy is available or not. The fix should be easy (from reading the man page http://man7.org/linux/man-pages/man2/getrandom.2.html): set the GRND_NONBLOCK flag on getrandom(); then, if the function returns -1 and sets EAGAIN, fallback to reading from /dev/urandom directly.

As mentioned on the other issue #25420, this is a regression and a change in documented behavior of os.urandom(), which is expected to be non-blocking, regardless of whether entropy is available or not.

The fix should be easy (from reading the man page http://man7.org/linux/man-pages/man2/getrandom.2.html): set the GRND_NONBLOCK flag on getrandom(); then, if the function returns -1 and sets EAGAIN, fallback to reading from /dev/urandom directly.

History
Date	User	Action	Args
2016-04-26 15:11:14	lemburg	set	recipients: + lemburg, rhettinger, doko, vstinner, matejcik, skrah, socketpair, thomas-petazzoni
2016-04-26 15:11:14	lemburg	set	messageid: <1461683474.82.0.840363872775.issue26839@psf.upfronthosting.co.za>
2016-04-26 15:11:14	lemburg	link	issue26839 messages
2016-04-26 15:11:14	lemburg	create