David Kilzer (unlinked)
WebCore security specialist
Summary
David Kilzer's work spans WebCore, Platform, and WTF, with a strong concentration in build and test infrastructure — ASan crash-log generation on failed IPC message checks, `run-webkit-tests` crash-log discovery for ServiceWorkerProcess, `check-webkit-style` filter and diff-path bugs, Swift/libwebrtc build plumbing — plus WTF container refactors such as adding and adopting `removeIf()`, and static-analyzer false-positive cleanup. His security fixes share a recognizable shape: object-lifetime and reentrancy crashes where a callback or event fires mid-operation — a reentrant `getContext()` landing in `CanvasRenderingContext::deref`, `navigation.reload()` called during a pageswap event hitting `HistoryController::updateForCommit()`, a voice-change notification into `WebSpeechSynthesisWrapper` — with one IPC-side input-validation fix in the GPU process (`Queue::writeTexture()` 1D `replaceRegion` fast path). He also touches IPC data races directly (`IPC::MessageLog::add()` ring buffer) and use-after-move in the WGSL compiler. Systematic-variant candidate: other script-reachable WebKit APIs that can be reentered from event handlers or notifications during teardown, and GPU-process IPC fast paths where an early-return skips the bounds check applied on the slow path.
Components
Security Fix History
- 2026-07-12 WebSpeechSynthesisWrapper crashes on voice change notification 2026-W28
- 2026-07-02 [CoreIPC][GPU] Queue::writeTexture() 1D replaceRegion fast-path should return early when copyExtent.height is zero ·
- 2026-06-30 Crash in CanvasRenderingContext::deref after reentrant getContext() ·
- 2026-06-01 WebPageProxy crash in dispatchSetObscuredContentInsets() and clearTextIndicatorWithAnimation() 2026-W22
- 2026-05-28 Crash in HistoryController::updateForCommit() when calling navigation.reload() during pageswap event handler 2026-W21
- 2026-05-28 Crash in -[WebScrollbarPartAnimationMac setCurrentProgress:] 2026-W21
- 2026-05-28 Crash in -[WKDateTimePicker removeDatePickerPresentation] via SetForScope destructor writing to self 2026-W21
- 2026-05-21 REGRESSION (301011@main): Crash in MediaPlayerPrivateMediaSourceAVFObjC::setNetworkState during destruction 2026-W20
- 2026-05-21 SWServer::topLevelServiceWorkerClientFromPageIdentifier() crashes when maps are out-of-sync 2026-W20
- 2026-05-21 Fix crashes in RealtimeIncoming*Source destructors by ensuring sink removal before member destruction 2026-W20
Hardening Commits
- No hardening commits recorded
Recent Commits
- 2026-08-07 [ASan] Generate a crash log when a process is killed for a failed IPC message check
- 2026-08-05 [WGSL] Use std::forward() in allocateAbstractType() to avoid use-after-move of lvalue arguments
- 2026-08-05 RemoteProgressBasedTimelineRegistry keeps empty source entries of threaded animations after a progress-based timeline ch
- 2026-08-05 run-webkit-tests never finds crash logs for ServiceWorkerProcess crashes
- 2026-08-04 [check-webkit-style] Remove dead wpt/lint/unnecessary_exclusion_in_web_features_file filter rule
- 2026-08-04 check-webkit-style --diff-files ignores the specified file paths and checks the full branch diff
- 2026-08-03 IPC::MessageLog::add() has a data race on the ring buffer element store
- 2026-08-03 Build failure: WebViewTests.swift uses try/await outside of #expect
- 2026-07-31 Add removeIf() to WeakHashSet and WeakListHashSet and adopt it to simplify more remove-matching-entries loops
- 2026-07-28 Install TestWebKitAPI and API-test executables on tools builds
- 2026-07-28 [WebKit] Swift build fails with "cannot infer ownership of foreign reference value" errors
- 2026-07-28 [WGSL] Fix uninitialized VisibilityValidator::m_stage member
- 2026-07-27 [libwebrtc] Build upstream unit tests using new `Unit Tests` aggregate target
- 2026-07-27 Add removeIf() to WTF::RobinHoodHashTable and adopt it to simplify remove-matching-entries loops
- 2026-07-27 [TestWebKitAPI] Fix missing dependency on _WebKit_SwiftUI for the TestWebKitAPI Swift module