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Where are you reading this quote? I'm seeing essentially the opposite in the linked post.

> ECC cannot provide complete protection against Rowhammer but makes exploitation harder.

edit: I looked at some linked papers and I see similar quotes, though not that one.

edit2:

https://arstechnica.com/gadgets/2021/11/ddr4-memory-is-even-...

> “DDR4 systems with ECC will likely be more exploitable, after reverse-engineering the ECC functions,” researchers Razavi and Jattke said.

OK, so not more exploitable relative to not-ecc RAM, just relative to ecc ram pre-RE.



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