Re: Restricting rdtsc [was: kernel aslr]

[Andreas Gustafsson <gson%gson.org@localhost>]

Maxime Villard wrote:
> Having read several papers on the exploitation of cache latency to defeat
> aslr (kernel or not), it appears that disabling the rdtsc instruction is a
> good mitigation on x86. However, some applications can legitimately use it,
> so I would rather suggest restricting it to root instead.

It's ASLR that's broken, not rdtsc, and I strongly object to
restricting the latter just to that people can continue to gain
a false sense of security from the former.
-- 
Andreas Gustafsson, gson%gson.org@localhost