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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Raw::updatecomputedsize + offsetandsrc_len + offsetwith unchecked u64 adds; release builds wrap (no overflow-checks profile), so crafted unsignedsystem_componentsvalues could wrap past the block-device bounds check.Fix: bounds math extracted into pure
checked_write_boundsusingchecked_add; unchanged behavior for valid inputs. Tests cover both overflow cases, exact-fit, and redundant slots (run in Linux CI).Mitigates: u64-wrap element of VULN-6331/6332; external disclosure report (Sep 2026), unchecked-arithmetic finding. Pre-existing residual (slot-A spill within device bounds): ORBS-1763. Part 2/3 of claim hardening.