“RAMBleed has been demonstrated on devices with DDR3 memory chips, and Rowhammer's bit flipping on DDR4 components. DDR4 supports a defensive technique called Targeted Row Refresh, but its efficacy is uncertain. "Given the closed-source nature by which TRR is implemented, it is difficult for the security community to evaluate its effectiveness," said Kwong. "While bit flips have been demonstrated on TRR before, the extent to which TRR mitigates RAMBleed remains an open question."https://www.theregister.co.uk/2019/06/11/rambleed_rowhammer_...
Dylan16807|6 years ago
Yeah but when I chase down references all I can find is one saying that rowhammer was possible on a Pixel phone, in turn referencing a paper that doesn't have the word 'pixel' in it. No study about how TRR effects the difficulty, or whether TRR was set up correctly. I want a chart showing bit flip difficulty vs. TRR aggressiveness. Because you can set TRR to be very aggressive with almost no performance impact on non-malicious workloads.