lkml.org 
[lkml]   [2018]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC] x86: Avoid CR3 load on compatibility mode with PTI
On Mon, Jan 15, 2018 at 11:49:19AM -0800, Dave Hansen wrote:
> If we start disabling PTI willy nilly at points _away_ from the
> capability checks (like for 32-bit binaries, say), then it gets really
> hard to decide if we are doing the right things.
>
> Also, what's the end goal here? Run old 32-bit binaries better? You
> want to weaken the security of the whole implementation to do that?
> Sounds like a bad tradeoff to me.

In fact I understand it differently, which is that by running 32-bit,
he can recover the original performance without sacrifying security.
It's not that bad actually when you think about it since the vast
majority of performance-sensitive software doesn't need to access
even one GB of data.

Willy

\
 
 \ /
  Last update: 2018-01-15 20:53    [W:0.088 / U:0.988 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site