Blacksmith – Rowhammer bit flips on all DRAM devices today despite mitigations

Re:Blacksmith – Rowhammer bit flips on all DRAM devices toda... by userbinator on Monday November 15, 2021 @03:58PM (#29232649)

Meanwhile you can still buy DDR3 --- used --- from various shops in China, and it'll be 100% perfect and Rowhammer-free because it was made before the insane process shrinkages that caused it.

(Have done this a few times. Was hesitant initially because of the low price and used nature, but when the first stick passed MemTest86+ including RH perfectly, I was convinced. Half a dozen more sticks later and still good. But maybe they've started to run out of the good old stuff now...)

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Re:Blacksmith – Rowhammer bit flips on all DRAM devices toda... by inetknght on Monday November 15, 2021 @06:55PM (#29234645)

> you can still buy DDR3 --- used --- from various shops in China, and it'll be 100% perfect and Rowhammer-free because it was made before the insane process shrinkages that caused it

That's demonstrably false. I remember rowhammer being thought of and demonstrated on DDR3 modules.

[0] https://hammertux.github.io/rowhammer-ffs-ddr3

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Re:Blacksmith – Rowhammer bit flips on all DRAM devices toda... by userbinator on Monday November 15, 2021 @07:55PM (#29235174)

Rowhammer started appearing in newer DDR3; see the original paper (figure 3): https://news.ycombinator.com/item?id=8713411

The tl;dr is that everything 2009 and older is good, 2010-2011 is possibly bad, 2012 and newer is almost certainly bad.

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