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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