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• W2664781091 abstract "Embedded systems are ubiquitous in every aspect of modern life. As the Internet of Thing expands, our dependence on these systems increases. Many of these interconnected systems are and will be low cost bare-metal systems, executing without an operating system. Bare-metal systems rarely employ any security protection mechanisms and their development assumptions (unrestricted access to all memory and instructions), and constraints(runtime, energy, and memory) makes applying protections challenging. To address these challenges we present EPOXY, an LLVM-based embedded compiler. We apply a novel technique, called privilege overlaying, wherein operations requiring privileged execution are identified and only these operations execute in privileged mode. This provides the foundation on which code-integrity, adapted control-flow hijacking defenses, and protections for sensitive IO are applied. We also design fine-grained randomization schemes, that work within the constraints of bare-metal systems to provide further protection against control-flow and data corruption attacks. These defenses prevent code injection attacks and ROP attacks from scaling across large sets of devices. We evaluate the performance of our combined defense mechanisms for a suite of 75 benchmarks and 3 real-world IoT applications. Our results for the application case studies show that EPOXY has, on average, a 1.8% increase in execution time and a 0.5% increase in energy usage." @default.
• W2664781091 created "2017-06-30" @default.
• W2664781091 creator A5000008290 @default.
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• W2664781091 date "2017-05-01" @default.
• W2664781091 modified "2023-10-16" @default.
• W2664781091 title "Protecting Bare-Metal Embedded Systems with Privilege Overlays" @default.
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• W2664781091 doi "https://doi.org/10.1109/sp.2017.37" @default.
• W2664781091 hasPublicationYear "2017" @default.
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