linux-kernel - Re: [kernel-hardening] rowhammer protection [was Re: Getting interrupt every million cache misses]

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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: [kernel-hardening] 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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