lkml.org 
[lkml]   [2019]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [RFC PATCH v7 00/16] Add support for eXclusive Page Frame Ownership
Date
Khalid Aziz <khalid.aziz@oracle.com> writes:

> I am continuing to build on the work Juerg, Tycho and Julian have done
> on XPFO.

Awesome!

> A rogue process can launch a ret2dir attack only from a CPU that has
> dual mapping for its pages in physmap in its TLB. We can hence defer
> TLB flush on a CPU until a process that would have caused a TLB flush
> is scheduled on that CPU.

Assuming the attacker already has the ability to execute arbitrary code
in userspace, they can just create a second process and thus avoid the
TLB flush. Am I getting this wrong?

Julian

\
 
 \ /
  Last update: 2019-01-16 16:00    [W:0.156 / U:0.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site