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Date: Sat, 12 Dec 2015 12:40:20 +0100
From: Heiko Carstens <>
To: Kees Cook <>
Cc: "" <>,
        Catalin Marinas <>,
        PaX Team <>, Michael Ellerman <>,
        Ralf Baechle <>
Subject: Re: Self Introduction

On Thu, Dec 10, 2015 at 11:23:34AM -0800, Kees Cook wrote:
> On Thu, Dec 10, 2015 at 11:07 AM, Daniel Micay <> wrote:
> >> Yeah. PCID was Sandybridge and later?
> >
> > Yeah, that's right. And it defaults to the strong PCID implementation,
> > but there's also a weaker but significantly faster PCID-based one.
> Is there anyone from Intel on the list? I would love to see UDEREF
> ported to upstream on x86 (and the non PCID version too). No one has
> stepped up to work on it yet.
> As for non-ARM and non-x86, IIRC s/390 has always had PAN, and I'd
> love to update the matrix for powerpc and MIPS.

The statement for s390 is correct: we always had PAN in use. It's a
hardware feature simply called "Address Spaces".

The way we use it in Linux on s390 makes is impossible to access user space
contents from kernel space without special instructions.

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