On Wed, May 20, 2020 at 10:00:31PM +0000, Konstantin Belousov wrote:
> Author: kib
> Date: Wed May 20 22:00:31 2020
> New Revision: 361302
> URL: https://svnweb.freebsd.org/changeset/base/361302
>
> Log:
> amd64: Add a knob to flush RSB on context switches if machine has SMEP.
>
> The flush is needed to prevent cross-process ret2spec, which is not handled
> on kernel entry if IBPB is enabled but SMEP is present.
> While there, add i386 RSB flush.
>
> Reported by: Anthony Steinhauser <asteinhau...@google.com>
> Reviewed by: markj, Anthony Steinhauser
> Discussed with: philip
> admbugs: 961
> Sponsored by: The FreeBSD Foundation
> MFC after: 1 week
https://reviews.freebsd.org/D24868
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