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A score, haptic signal, audio scene, splat4d clip or film declares its length in its contract, and rendering allocates in proportion: a score's mixdown allocated `duration` samples outright, a haptic channel `duration` × 2 bytes, a scene's stereo mix 20 bytes a sample, and the splat4d and film receipts a hash a frame. Nothing bounded the declaration, so a few bytes could ask a renderer for more memory than any machine has. SECURITY.md recorded it as a gap when the fuzzing PR found the reader-side reservations. Each extension's contract section (score, haptics, spatial-audio, volumetric, linear-film and its reel) now has a reader limit shared with SPEC §2, through a new always-on module `wai::limits`: - score and haptics: `duration × channels` at most 2^27 samples; - audio scene: `duration` at most 2^26, so the stereo floor is at most 2^27 samples; - splat4d `n_frames`, film `frames`, a reel's shots together: at most 2^20 frames. A reader may refuse past them (`duration_too_long`) when it reads the contract, before anything is rendered; a conforming encoder writes none. The film schedule's tick, `start_tick + f × ticks_per_frame`, wrapped in release builds and panicked in debug ones. A reader must now refuse a schedule whose last tick passes 2^64 - 1 (a film's, and each shot's of a reel); `Film::frame_tick` saturates and `Reel::frame_tick` uses checked arithmetic. tests/extension_duration_limits.rs rewrites a committed vector of each format to declare exactly its limit (it reads) and one past it (refused by name), and checks the film schedule ending at 2^64 - 1 (reads) and past it (refused). Falsified: with the readers as they were, all three tests fail. The world, audio, haptic, splat4d, score and film corpora verify unchanged; the 275 lib tests with the container features pass. CI runs the test beside container_reservations on every leg. SECURITY.md drops the gap and keeps the one this exposes: replaying a world to a far tick costs time in proportion (memory is bounded, time is not). Co-Authored-By: Claude Opus 5.5 <[email protected]> |
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| .. | ||
| avatars.md | ||
| capability-constraints.md | ||
| confidentiality.md | ||
| delivery-telemetry.md | ||
| derived-tracks.md | ||
| determinism-tiers.md | ||
| energy-binding.md | ||
| energy-measurement.md | ||
| graphics-vector.md | ||
| haptics.md | ||
| http-delivery.md | ||
| integer-operators.md | ||
| integer-payloads.md | ||
| interactive-worlds.md | ||
| jwp-receipts.md | ||
| linear-film.md | ||
| moq-streaming-format.md | ||
| oer-receipts.md | ||
| packaging.md | ||
| prior-carriage.md | ||
| provenance.md | ||
| quantum-ops.md | ||
| quantum-sim.md | ||
| reconstruction-binding.md | ||
| score.md | ||
| spatial-audio.md | ||
| staged-delivery.md | ||
| staged-measurement.md | ||
| state-feeds.md | ||
| task-fidelity.md | ||
| ternary-tt.md | ||
| transparency.md | ||
| unidirectional-delivery.md | ||
| volumetric.md | ||