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Cache side channel attacks obtain victim cache line access footprint to infersecurity-critical information. Among them, cross-core attacks exploiting theshared last level cache are more threatening as their simplicity to set up andhigh capacity. Stateful approaches of detection-based mitigation observeprecise cache behaviors and protect specific cache lines that are suspected ofbeing attacked. However, their recording structures incur large storageoverhead and are vulnerable to reverse engineering attacks. Exploring theintrinsic non-determinate layout of a traditional Cuckoo filter, this paperproposes a space efficient Auto-Cuckoo filter to record access footprints,which succeed to decrease storage overhead and resist reverse engineeringattacks at the same time. With Auto-Cuckoo filter, we propose PiPoMonitor todetect \textit{Ping-Pong patterns} and prefetch specific cache line tointerfere with adversaries' cache probes. Security analysis shows thePiPoMonitor can effectively mitigate cross-core attacks and the Auto-Cuckoofilter is immune to reverse engineering attacks. Evaluation results indicatePiPoMonitor has negligible impact on performance and the storage overhead isonly 0.37$\%$, an order of magnitude lower than previous stateful approaches.

PiPoMonitor: Mitigating Cross-core Cache Attacks Using the Auto-Cuckoo Filter