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dhecht

JSC security specialist

100 commits (11mo)
9 security fixes
2 hardening
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Summary

dhecht works almost entirely inside JSC, concentrated in the B3/Air backend — register allocator migration (graph-coloring removal, GreedyRegAlloc live-range splitting) alongside optimization-pass fixes — with a secondary line in bmalloc/libpas covering TLC lifetime bugs and allocator test coverage for evicted and paged-out backing, plus a GC finalization refactor (the visitWeak → reconcileWeakReferencesAtGCEnd renames and the LazyJSValue::emit StringImpl leak). The security-flagged commits are compiler-correctness rather than memory-safety hardening: ReduceStrength Select specialization when a Check sits between Select and trigger, BackwardsGraph on loops with multiple back-edge sources, patchpoint cloning for Wasm calls inside try blocks, and CallLinkInfo linking after handleHostCall — all landing in a tight late-August window, which reads as a sweep of B3 passes rather than isolated inbound reports. Systematic-variant candidate: other ReduceStrength specializations and Air-level clone/duplication paths that make the same assumptions about intervening side-effecting nodes and non-trivial control flow.

Components

JSC
76%
bmalloc
17%
bmalloc/libpas
3%
WebKit
2%
WTF
1%
Other
1%

Security Fix History

Hardening Commits

Recent Commits

1 / 7

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