Messages in this thread | | | Subject | Re: [RFC PATCH 04/10 v2 ] x86/fpu: eager switch PKRU state | From | Rik van Riel <> | Date | Tue, 18 Sep 2018 13:29:01 -0400 |
| |
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] | |