linux-kernel - Re: [RFC, PATCH] x86_64: KAISER - do not map kernel in user mode

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Message-ID: <20170504154717.GA24353@infradead.org>
Date:   Thu, 4 May 2017 08:47:17 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Daniel Gruss <daniel.gruss@...k.tugraz.at>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        kernel-hardening@...ts.openwall.com,
        "clementine.maurice@...k.tugraz.at" 
        <clementine.maurice@...k.tugraz.at>,
        "moritz.lipp@...k.tugraz.at" <moritz.lipp@...k.tugraz.at>,
        Michael Schwarz <michael.schwarz@...k.tugraz.at>,
        Richard Fellner <richard.fellner@...dent.tugraz.at>,
        kirill.shutemov@...ux.intel.com, Ingo Molnar <mingo@...nel.org>,
        "anders.fogh@...ta-adan.de" <anders.fogh@...ta-adan.de>
Subject: Re: [RFC, PATCH] x86_64: KAISER - do not map kernel in user mode

On Thu, May 04, 2017 at 12:02:47PM +0200, Daniel Gruss wrote:
> After several recent works [1,2,3] KASLR on x86_64 was basically considered
> dead by many researchers. We have been working on an efficient but effective
> fix for this problem and found that not mapping the kernel space when
> running in user mode is the solution to this problem [4] (the corresponding
> paper [5] will be presented at ESSoS17).

I'll try to read the paper.  In the meantime: how different is your
approach from then one here?

	https://lwn.net/Articles/39283/

and how different is the performance impact?