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Hovav Shacham

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Mohabi: Disaggregating and Sandboxing the Firefox JavaScript Engine20th USENIX Symposium on Operating Systems Design and Implementation (OSDI '26)2026-07-13
Mohabi disaggregates SpiderMonkey from Firefox, adds wrapper types (e.g., split rooted wrapper, sandbox heap/stack/callbacks), and applies an external SFI…
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The Most Dangerous Codec in the World: Finding and Exploiting Vulnerabilities in H.264 DecodersBlack Hat USA 20232023-08-05
H26Forge is a toolkit that programmatically mutates H.264 syntax elements (30,000+ lines of Rust, Python transforms) to generate test videos; batches of 100…
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Cachet: A Domain-Specific Language for Trustworthy Just-In-Time CompilersPriSC 20232023-01-21
Cachet is a DSL that compiles Cachet to Boogie and C++ and encodes JIT invariants so the verifier proves generated code never violates them. The toolchain uses…
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FaJITa: Verifying Optimizations on Just-In-Time ProgramsPriSC 20232023-01-21
FaJITa is a translation validator that checks semantic equivalence of JavaScript functions after Firefox JIT optimizations by combining symbolic execution with…
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Automated Policy Synthesis for System Call SandboxingOOPSLA 20202020-11-15
Abhaya automatically generates sound, optimal syscall-whitelisting policies by combining a scalable static analysis with an SMT-guided synthesis phase. The…
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On the effectiveness of mitigations against floating-point timing channels26th USENIX Security Symposium (USENIX Security '17)2017-08-16
Benchmarks show operand-dependent timings: divisions and square roots hit 150–175 cycle spikes for some value families while powers-of-two and zero run about…
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Trusted Browsers for Uncertain TimesUSENIX Security '162016-08-10
JavaScript can recover fine-grained time even when performance.now is rounded coarsely; the clock edge technique and other tactics boost effective resolution…
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