[LEDE-DEV] [PATCH v5] base-files: seed /dev/urandom

[Etienne Champetier]

2016-07-19 7:09 GMT+02:00 Jo-Philipp Wich <jo at mein.io>:
> Hi Daniel,
>
> interesting failure mode ;(
>
> To me it seems the easiest fix is changing the getrandom syscall wrapper
> utility to use the GRND_NONBLOCK flag in order to be interruptible by
> signals.
>
> Thoughts?

According to the man page it's already interruptible if /dev/urandom
init is not done
http://man7.org/linux/man-pages/man2/getrandom.2.html

The behavior when a call to getrandom() that is blocked while reading
from /dev/urandom is interrupted by a signal handler depends on the
initialization state of the entropy buffer and on the request size,
buflen.  If the entropy is not yet initialized, then the call will
fail with the EINTR error.

and getrandom handle syscall errors
https://git.lede-project.org/?p=project/ubox.git;a=blob;f=getrandom.c;h=96712028589b100f3fab845f92d7fd554428efe4;hb=HEAD

quick fix before I understand the problem is to add
getrandom 1 > /dev/null



>
> ~ Jo
>
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