lkml.org 
[lkml]   [2018]   [Sep]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC PATCH 04/10 v2 ] x86/fpu: eager switch PKRU state
From
Date
On Tue, 2018-09-18 at 18:04 +0200, Sebastian Andrzej Siewior wrote:
> On 2018-09-18 17:29:52 [+0200], Paolo Bonzini wrote:
> > > I don't think it matters what the PKRU state is
> > > for kernel threads, since kernel PTEs should not
> > > be using protection keys anyway.
> >
> > What about copy_from/to_user?
>
> This doesn't work for a kernel thread, does it? I mean they share the
> init's MM and never do copy_{from|to}_user.

Indeed, copy_from/to_user only works if current->mm
points at an mm_struct with userspace memory.

--
All Rights Reversed.
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2018-09-18 19:29    [W:0.066 / U:2.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site