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Date: Thu, 10 Dec 2015 23:38:25 +0100
From: "PaX Team" <pageexec@...email.hu>
To: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Kees Cook <keescook@...omium.org>
CC: Catalin Marinas <catalin.marinas@....com>
Subject: Re: Self Introduction
On 10 Dec 2015 at 10:42, Kees Cook wrote:
> http://kernsec.org/wiki/index.php/Exploit_Methods/Userspace_data_usage
>
> On Thu, Dec 10, 2015 at 9:55 AM, Daniel Micay <danielmicay@...il.com> wrote:
> >> ARMv8 64-bit: ??
> >
> > The worst case scenario would be doing something like the x86_64 UDEREF.
> >
> >> x86 pre-late-Broadwell: nothing upstream (though UDEREF in PaX exists)
> >
> > It's worth noting that there's the pre-PCID implementation (slow and
> > vulnerable to races)
uhm, what races? the per-cpu PGD exists for that reason, regardless of PCID.
> > and then two choices of better implementations when
> > PCID is available. You probably know that already, but it's not obvious
> > to everyone else.
>
> Yeah. PCID was Sandybridge and later?
IIRC, it is more like Westmere and later.
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