Someone pointed out this. Looks like the kernel will in future contain this hack to filter out UDP packets with broken checksum at select time for blocking sockets. So the various select-with-blocking-socket UDP vulnerabilities have returned to minor niggles now — although the software in question is still broken, of course, but the status quo ante is restored, so it will once again be hard to trigger.

So it is not of much interest now, but in case you want it, here is my patch to detect select(2)s on blocking sockets.