[lkml]   [2019]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [PATCH] x86/entry/64: randomize kernel stack offset upon syscall
> From: Reshetova, Elena
> > Sent: 24 April 2019 12:43
> >
> > Sorry for the delay - Easter holidays + I was trying to arrange my brain around
> proposed options.
> > Here what I think our options are with regards to the source of randomness:
> >
> > 1) rdtsc or variations based on it (David proposed some CRC-based variants for
> example)
> Do I remember something about rdtsc being made less accurate in order to
> make it (slightly) more difficult to use it to measure timing attacks?

Do you have any pointers on this? I did an online search, but could not find anything
concrete. The Intel manual doesn't talk about precision at all, only about protected

> If true, and it applies to the kernel (eg in a VM) then this is probably
> all pointless!

You mean additional constructions on top of TSC is pointless?

Best Regards,
 \ /
  Last update: 2019-04-25 13:25    [W:0.123 / U:51.124 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site