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chicoxyzzy

JSC security specialist

65 commits (3mo)
3 security fixes
4 hardening
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Summary

Works almost exclusively in JavaScriptCore, and within it almost entirely on WebAssembly: GC reference types, the ESM module-integration path (reserved `wasm:`/`wasm-js:` specifier handling, mutable-global bindings, JS string builtins), and ARM64 codegen for Wasm stubs and address forms, alongside occasional core JS spec-conformance fixes such as ArrayBuffer grow/resize length handling, Date component range validation, and `Atomics.isLockFree` coercion. The work reads as spec-conformance and codegen tuning rather than dedicated security review, but a recurring subset lands directly on memory-safety boundaries — initializing Wasm GC arrays of references with `gcSafeMemfill`, forcing BoundsChecking for Memory64 accesses in BBQ, and range-checking lengths before narrowing to `size_t`. Systematic-variant candidate: the repeated `gcSafeMemfill` fixes across separate ref-array initialization sites suggest the sweep is incomplete — other Wasm GC allocation and fill paths are worth checking for reference-typed storage still written with non-GC-safe fills.

Components

JSC
95%
Other
5%

Security Fix History

Hardening Commits

Recent Commits

1 / 5

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