Uncovering In-DRAM RowHammer Protection Mechanisms: A New Methodology, Custom RowHammer Patterns, and Implications. (arXiv:2110.10603v2 [cs.CR] UPDATED)

The RowHammer vulnerability in DRAM is a critical threat to system security.
To protect against RowHammer, vendors commit to security-through-obscurity:
modern DRAM chips rely on undocumented, proprietary, on-die mitigations,
commonly known as Target Row Refresh (TRR). At a high level, TRR detects and
refreshes potential RowHammer-victim rows, but its exact implementations are
not openly disclosed. Security guarantees of TRR mechanisms cannot be easily
studied due to their proprietary nature.

To assess the security guarantees of recent DRAM chips, we present …

dram patterns protection rowhammer