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Use KERN_ARND syscall for random numbers on NetBSD, same as FreeBSD. #66092

Merged
merged 2 commits into from
Nov 6, 2019
Merged

Use KERN_ARND syscall for random numbers on NetBSD, same as FreeBSD. #66092

merged 2 commits into from
Nov 6, 2019

Commits on Nov 4, 2019

  1. Use KERN_ARND syscall for random numbers on NetBSD, same as FreeBSD. 

    This system call is present on all supported NetBSD versions and
provides an endless stream of non-blocking random data from the
kernel's ChaCha20-based CSPRNG. It doesn't require a file descriptor
to be opened.

The system call is documented here (under kern.arandom):
https://netbsd.gw.com/cgi-bin/man-cgi?sysctl+7+NetBSD-7.0

And defined here:
https://nxr.netbsd.org/xref/src/sys/sys/sysctl.h#273

The semantics are the same as FreeBSD so reading 256 bytes per call
is fine.

Similar change for getrandom crate: rust-random/getrandom#115
    @alarixnia
    alarixnia committed Nov 4, 2019
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  2. Use any() in code shared between FreeBSD and NetBSD

    @alarixnia
    alarixnia committed Nov 4, 2019
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