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SpecFuzz is the first tool that enables dynamic testing for speculativeexecution vulnerabilities (e.g., Spectre). The key is a novel concept ofspeculation exposure: The program is instrumented to simulate speculativeexecution in software by forcefully executing the code paths that could betriggered due to mispredictions, thereby making the speculative memory accessesvisible to integrity checkers (e.g., AddressSanitizer). Combined with theconventional fuzzing techniques, speculation exposure enables more preciseidentification of potential vulnerabilities compared to state-of-the-art staticanalyzers.  Our prototype for detecting Spectre V1 vulnerabilities successfullyidentifies all known variations of Spectre V1 and decreases the mitigationoverheads across the evaluated applications, reducing the amount ofinstrumented branches by up to 77% given a sufficient test coverage.

SpecFuzz: Bringing Spectre-type vulnerabilities to the surface