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Jake WriterandClaude Opus 5
fd501e5d01
Two findings from auditing the sweep's fixes against one bar: a difference is a leak only if a page's JavaScript can actually read it. hardwareConcurrency 2 was excluded from PLAUSIBLE_CORE_COUNTS because "2 is what Firefox reports under resistFingerprinting". That has not been true for years: RuntimeService::ClampedHardwareConcurrency hardcodes 4, and 8 on macOS, both of which are already in the table. The exclusion protected against nothing and cost every genuinely dual-core machine -- 20% of the macOS presets in the recorded corpus, 4.2% of Linux draws. It also made the small-host tail worse: a 3-core host reported 4, which cannot be pinned, so a page measured 3 while being told 4. At 2 the pin succeeds. pin_cpu_cores now defaults to False. What it buys is defence against a page timing N parallel workers; what it costs is a browser-wide CPU cap, a per-driver launch lock, and nothing at all on macOS. Unpinned, the host's own snapped count is reported, so reported and measurable still agree -- the identity just loses one drawn value. Callers who want the draw kept can still ask for it. The WebGL sampler keeps rejecting software rasterisers, and its docstring now says so: it described the opposite of what the code does. llvmpipe as the presented GPU is a live check on a string every fingerprint script reads, which is worth ~1.5% of corpus fidelity. 251 pythonlib tests pass. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>