DRAM Rowhammer exploits

[Poul-Henning Kamp]

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In message <alpine.BSF.2.00.1503092309570.38285 at woozle.rinet.ru>, Dmitry Morozo
vsky writes:
>On Mon, 9 Mar 2015, Poul-Henning Kamp wrote:
>
>> >any thoughts we're vulnerable to this?
>> 
>> It's a hardware problem, *everybody* are vulnerable.
>
>Well, it seems I used somewhat incorrect wordings.
>
>Any chance we could provide workaround like for Pentium f00f bug?

As far as I know the only workaround is increasing the DRAM refresh
rate sufficiently that the hardware behaves as it should.

It seems that such BIOS updates are being rolled out, but undoubtedly
a lot of old machines will get none and it's not even entirely obvious
that increasing the DRAM refresh rate is enough.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.