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Message-ID: <20161101081043.GA27659@amd>
Date: Tue, 1 Nov 2016 09:10:43 +0100
From: Pavel Machek <pavel@....cz>
To: Ingo Molnar <mingo@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>, Kees Cook <keescook@...omium.org>,
Peter Zijlstra <peterz@...radead.org>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
kernel list <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...hat.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: rowhammer protection [was Re: Getting
interrupt every million cache misses]
Hi!
> * Pavel Machek <pavel@....cz> wrote:
>
> > I'm not going to buy broken hardware just for a test.
>
> Can you suggest a method to find heavily rowhammer affected hardware? Only by
> testing it, or are there some chipset IDs ranges or dmidecode info that will
> pinpoint potentially affected machines?
Testing can be used. https://github.com/mseaborn/rowhammer-test.git
. It finds faults at 1 of 2 machines here (but takes half an
hour). Then, if your hardware is one of ivy/sandy/haswell/skylake,
https://github.com/IAIK/rowhammerjs.git can be used for much faster
attack (many flips a second).
Unfortunately, what I have here is:
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz
stepping : 10
microcode : 0xa07
so rowhammerjs/native is not available for this system. Bit mapping
for memory hash functions would need to be reverse engineered for more
effective attack.
Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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