[WireGuard] [PATCH] use runtime check for getrandom syscall

[Daniel Kahn Gillmor]

On Sat 2016-07-02 16:10:42 -0400, Jason A. Donenfeld wrote:

> WireGuard supports kernels ≥4.1. getrandom was added in 3.17. So, all
> kernels on which wg is useful support getrandom.

Sure, but in that case why bother with the compile-time check at all,
and why not just use getrandom(2) directly instead of syscall(2)?

It's also possible to generate machine configs (with wg) on a machine
that doesn't plan to run it (e.g., if you're deploying psk's through a
configuration-management system).

With the patch, wg should just work on any of these systems.

   --dkg