Messages in this thread | | | From | Kees Cook <> | Date | Tue, 9 Jan 2018 09:53:00 -0800 | Subject | Re: [PATCH v6 11/10] x86/retpoline: Avoid return buffer underflows on context switch |
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On Tue, Jan 9, 2018 at 5:04 AM, David Woodhouse <dwmw2@infradead.org> wrote: > 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?
Yup. The KAISERish ports (4.9 and 4.4) have the same feature.
-Kees
-- Kees Cook Pixel Security
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