Re: CVS commit: src/sys/arch/x86/x86

[Taylor R Campbell <campbell+netbsd-source-changes-d%mumble.net@localhost>]

> Date: Mon, 2 Oct 2017 16:25:34 -0600
> From: Warner Losh <imp%bsdimp.com@localhost>
> 
> Why should I provide an attacker a stop watch? I want him/her to build
> their own that has the potential to be accurate enough, but is necessarily
> less accurate than the one I'm denying them access to.

There are plenty of legitimate applications of stop-watches.  It would
be great to forbid the attacker from doing arithmetic on your CPU too,
but if you forbid all your applications from using it, well, the chunk
of magic sand in your computer becomes about as useful as a chunk of
inert sand.