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Memory safety is a key security property that stops memory corruptionvulnerabilities. Existing sanitizers enforce checks and catch such bugs duringdevelopment and testing. However, they either provide partial memory safety orhave overwhelmingly high performance overheads. Our novel sanitizer PACSanenforces spatial and temporal memory safety with no false positives at lowperformance overheads. PACSan removes the majority of the overheads involved inpointer tracking by sealing metadata in pointers through ARM PA (PointerAuthentication), and performing the memory safety checks when pointers aredereferenced. We have developed a prototype of PACSan and systematicallyevaluated its security and performance on the Magma, Juliet, Nginx, and SPECCPU2017 test suites, respectively. In our evaluation, PACSan shows no falsepositives together with negligible false negatives, while introducing strongersecurity guarantees and lower performance overheads than state-of-the-artsanitizers, including HWASan, ASan, SoftBound+CETS, Memcheck, LowFat, andPTAuth. Specifically, PACSan has 0.84x runtime overhead and 1.92x memoryoverhead on average. Compared to the widely deployed ASan, PACSan has no falsepositives and much fewer false negatives and reduces 7.172% runtime overheadsand 89.063%memory overheads.

PACSan: Enforcing Memory Safety Based on ARM PA