On Mon, 2018-01-08 at 19:27 -0800, Andy Lutomirski wrote: > > > > If SMEP is not active, speculation can go anywhere, including to a user > > controlled gadget which can reload any registers it needs, including > > with immediate constants. > > I thought that, even on pre-SMEP hardware, the CPU wouldn't > speculatively execute from NX pages. And PTI marks user memory NX > in kernel mode.
Hm, now that could be useful. Do *all* the KPTI backports (some of which are reimplementations rather than strictly backports) mark user memory NX?
smime.p7s
Description: S/MIME cryptographic signature
