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

From	Daniel Micay <danielmicay@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [kernel-hardening] rowhammer protection [was Re: Getting interrupt every million cache misses]
Date	2016-11-01 08:30 +0100
Message-ID	<syBGa-5AA-9@gated-at.bofh.it> (permalink)
References	(6 earlier) <sxc78-6yE-29@gated-at.bofh.it> <sxdwe-7Es-7@gated-at.bofh.it> <sxg13-Tz-11@gated-at.bofh.it> <syg8G-8jp-31@gated-at.bofh.it> <syATL-542-3@gated-at.bofh.it>
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On Tue, 2016-11-01 at 07:33 +0100, Ingo Molnar wrote:
> * Pavel Machek <pavel@ucw.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?
> 
> Thanks,
> 
> 	Ingo

You can read the memory timing values, but you can't know if they're
reasonable for that hardware. Higher quality memory can have better
timings without being broken. The only relevant information would be the
memory model, combined with an expensive / time consuming effort to
build a blacklist based on testing. It doesn't seem realistic, unless
it's done in a coarse way based on brand and the date information.

I don't know how to get this data on Linux. The CPU-Z tool for Windows
knows how to obtain it but it's based on a proprietary library.

You definitely don't need to buy broken hardware to test a broken
hardware setup though. You just need a custom computer build where
motherboards expose the memory timing configuration. You can make it
more vulnerable by raising the refresh period (tREF). I wanted to play
around with that but haven't gotten around to it.

Thread

Re: Getting interrupt every million cache misses Pavel Machek <pavel@ucw.cz> - 2016-10-27 16:40 +0200
  Re: Getting interrupt every million cache misses Peter Zijlstra <peterz@infradead.org> - 2016-10-27 16:40 +0200
    Re: Getting interrupt every million cache misses Kees Cook <keescook@chromium.org> - 2016-10-27 22:50 +0200
      rowhammer protection [was Re: Getting interrupt every million cache  misses] Pavel Machek <pavel@ucw.cz> - 2016-10-27 23:30 +0200
        Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Ingo Molnar <mingo@kernel.org> - 2016-10-28 09:10 +0200
          Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-28 11:00 +0200
            Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Ingo Molnar <mingo@kernel.org> - 2016-10-28 11:00 +0200
              Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-28 14:00 +0200
            Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Peter Zijlstra <peterz@infradead.org> - 2016-10-28 11:10 +0200
              Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Vegard Nossum <vegard.nossum@gmail.com> - 2016-10-28 11:30 +0200
                Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Ingo Molnar <mingo@kernel.org> - 2016-10-28 11:40 +0200
                Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Vegard Nossum <vegard.nossum@gmail.com> - 2016-10-28 11:50 +0200
                Re: [kernel-hardening] Re: rowhammer protection [was Re: Getting  interrupt every million cache misses] Mark Rutland <mark.rutland@arm.com> - 2016-10-28 12:00 +0200
              Re: rowhammer protection [was Re: Getting interrupt every million  cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-28 13:30 +0200
        Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Mark Rutland <mark.rutland@arm.com> - 2016-10-28 12:00 +0200
          Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-28 13:30 +0200
            Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Mark Rutland <mark.rutland@arm.com> - 2016-10-28 16:10 +0200
              Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Peter Zijlstra <peterz@infradead.org> - 2016-10-28 16:20 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-28 20:40 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Peter Zijlstra <peterz@infradead.org> - 2016-10-28 20:50 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-11-02 19:20 +0100
              Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-28 19:30 +0200
                Re: Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-10-29 15:20 +0200
                Re: Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-29 21:50 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-10-29 22:10 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-29 23:10 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-10-29 23:10 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-29 23:50 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-10-30 00:00 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-30 00:10 +0200
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-10-30 00:10 +0200
              Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-31 09:30 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Mark Rutland <mark.rutland@arm.com> - 2016-10-31 15:50 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-10-31 22:20 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Mark Rutland <mark.rutland@arm.com> - 2016-10-31 23:10 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Ingo Molnar <mingo@kernel.org> - 2016-11-01 07:40 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Micay <danielmicay@gmail.com> - 2016-11-01 08:30 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-11-01 09:00 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Daniel Gruss <daniel@gruss.cc> - 2016-11-01 09:20 +0100
                Re: [kernel-hardening] rowhammer protection [was Re: Getting  interrupt every million cache misses] Pavel Machek <pavel@ucw.cz> - 2016-11-01 09:20 +0100

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