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• W3021690774 abstract "Covert channels enable information leakage across security boundaries of the operating system. Microarchitectural covert channels exploit changes in execution timing resulting from competing access to limited hardware resources. We use the recent experimental support for time protection, aimed at preventing covert channels, in the seL4 microkernel and evaluate the efficacy of the mechanisms against five known channels on Ariane, an open-source 64-bit application-class RISC-V core. We confirm that without hardware support, these defences are expensive and incomplete. We show that the addition of a single-instruction extension to the RISC-V ISA, that flushes microarchitectural state, can enable the OS to close all five evaluated covert channels with low increase in context switch costs and negligible hardware overhead. We conclude that such a mechanism is essential for security." @default.
• W3021690774 created "2020-05-13" @default.
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• W3021690774 date "2020-05-01" @default.
• W3021690774 modified "2023-09-23" @default.
• W3021690774 title "Prevention of Microarchitectural Covert Channels on an Open-Source 64-bit RISC-V Core." @default.
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