Date: Sat, 2 Jun 2018 17:41:09 +0000 From: procmem <procmem@...eup.net> To: Greg KH <gregkh@...uxfoundation.org> Cc: kernel-hardening@...ts.openwall.com Subject: Re: Nethammer and kernel network drivers Hello. Daniel provided more details on the problematic areas of the kernel and I quote what he said verbatim: > We have only found very outdated network drivers using clflush (old > windows ndis code). On ARM there are many drivers using uncached memory. > However, we have so far failed to produce enough memory traffic on ARM > to trigger a bit flip with Nethammer on any ARM device. > It should be possible though if you can make the ARM device handle >> =300MBit/s. > And that's the most plausible scenario. > > Anyway, searching for clflush or use of uncached memory is a good idea > to locate the critical spots. > > Intel CAT is (we believe) not used anywhere yet. And we must be careful > when it gets to the point where we introduce usage of CAT for QoS > mechanisms. > > However, my intuition tells me that most systems are not even vulnerable > to Rowhammer in the first place. Although the only prevalence studies we > have suggest otherwise (they find 60-80% are affected). >
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