linux-kernel - Re: [kernel-hardening] Re: [RFC, PATCH] x86_64: KAISER

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Message-ID: <22a14b06-9489-3494-bbb7-428d4e5fa186@nod.at>
Date:   Tue, 9 May 2017 16:57:28 +0200
From:   Richard Weinberger <richard@....at>
To:     "Fogh, Anders" <anders.fogh@...ta-adan.de>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>
Cc:     Christoph Hellwig <hch@...radead.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <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 A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [kernel-hardening] Re: [RFC, PATCH] x86_64: KAISER - do not
 mapkernel in user mode

Am 09.05.2017 um 16:44 schrieb Fogh, Anders:
>>> i.e. how does it perform on recent AMD systems?
> 
> Sorry for the latency. Recent AMD is reported by Enrique Nissem to not
> be vulnerable to the prefetch attack. TSX attack doesn't apply to AMD.
> Hund, Willems & Holz wrote in 2013 that AMD was vulnerable to that
> attack. The BTB is almost surely working in a different manner of
> fashion if at all. So AMD may or may not be vulnerable to the DPF
> attack, but none of the modern attacks should work - at least out of the
> box.

But the promoted patch will also run on AMD systems, that's why I asked
for the overhead.

Thanks,
//richard