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 Download attachment "signature.asc" of type "application/pgp-signature" (182 bytes)
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