STINNER Victor added the comment: Martin: > I wonder what we should do on Linux if /dev/urandom is unavailable and > getrandom() would block.
os.urandom(block=False) should raise BlockingIOError if getrandom(GRND_NONBLOCK) fails with EAGAIN and /dev/urandom is not available. Larry: > I don't think that happens. getrandom() actually supports two flags. The > flag GRND_RANDOM tells it "behave like /dev/random". If you don't pass in > GRND_RANDOM, it behaves like "/dev/urandom". So it's hard to imagine that > you could have getrandom() and not have /dev/urandom. You can imagine a "badly configured" container or chroot where /dev or only /dev/urandom doesn't exist. When I played with chroot, it was easy to forget /dev/urandom. Since Python uses getrandom() on Linux since Python 3.5, you can imagine that a Python 3.5 user may not notice the lack of /dev/urandom in the common case (urandom initialized), but start to get errors when the container runs before urandom is initialized. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27266> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
