[issue26839] Python 3.5 running on Linux kernel 3.17+ can block at startup or on importing the random module on getrandom()

[STINNER Victor]

STINNER Victor added the comment:

Manual check to ensure that getrandom() syscall is used on Linux:

$ strace -o trace ./python -c 'import os; os.urandom(16); os.urandom(16)' && grep getrandom trace 
getrandom("...", 24, GRND_NONBLOCK) = 24
getrandom("...", 16, GRND_NONBLOCK) = 16
getrandom("...", 16, GRND_NONBLOCK) = 16

The first read of 24 bytes is to initialize the randomized hash function.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26839>
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