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GuardION: Practical Mitigation of DMA-basedRowhammer Attacks on ARMV ictor van der Veen1, Martina Lindorfer3, Yanick Fratantonio4, HarikrishnanPadmanabha Pillai2, Giovanni Vigna3, Christopher Kruegel3, Herbert Bos1,and Kaveh Razavi11 Vrije Universiteit University Santa the last two years, the Rowhammer bug transformedfrom a hard-to-exploit DRAM disturbance error into a fully weaponizedattack vector. Researchers demonstrated exploits not only against desk-top computers, but also used single bit flips to compromise the cloudand mobile devices, all without relying on any software hardware-level mitigations cannot be backported, a search for soft-ware defenses is pressing. Proposals made by both academia and indus-try, however, are either impractical to deploy, or insufficient in stoppingall attacks: we presentrampage, a set of DMA-based Rowhammer at-tacks against the latest Android OS, consisting of (1) a root exploit, and(2) a series of app-to-app exploit scenarios that bypass all mitigate Rowhammer exploitation on ARM, we proposeguardion, alightweight defense that prevents DMA-based attacks the main attackvector on mobile devices by isolating DMA buffers with guard evaluateguardionon 22 benchmark apps and show that it hasa negligible memory overhead ( MB on)
GuardION: Practical Mitigation of DMA-based Rowhammer Attacks 3 ditionally, ARMv8’s unprivileged cache ush instruction can easily be disabled
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