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feat: U2 UTRW slow path real branches

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- slow_path.c: KEY_MISS -> PCKC re-derive (retry OK); EPOCH -> refresh cap epoch via out_cap (retry OK); STALE_CAP permanent; MAC_FAILED/POISONED -> PCKC invalidate + DRR fault report; RETRY passthrough
- status.h: add UTSM_ERR_MAC_FAILED (-11); utrw.h: slow path takes cap/rights/offset/len/reason + out_cap
- selftest: EPOCH refresh + KEY_MISS re-derive + POISONED passthrough coverage, full SELFTEST PASS in QEMU (.build_tmp/qemu_serial_u2slowpath.log)
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Linehu
2026-10-02 14:29:28 +08:00
parent 1eaf1aedf8
commit b76e8f1556
16 changed files with 187 additions and 13 deletions
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docs/STATUS.md
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@@ -26,7 +26,7 @@
|--------|------|----------|------|
| 封缄段表 / UUID 调谐（U1） | ✅ | 段创建/查询闭环 | `CODE/UTSM/core/segment.c` |
| UTRW Fast Path | ✅ | capability→PCKC→line 解密→seqlock | `utrw/read.c` |
| UTRW Slow Path（U2） | ⬜ | `utrw/slow_path.c` 当前为 stub | — |
| UTRW Slow Path（U2） | ✅ | EPOCH 刷新 / KEY_MISS 重派生 / POISONED+MAC_FAILED→DRR / STALE_CAP 拒绝；全分支 selftest PASS | `utrw/slow_path.c` + `.build_tmp/qemu_serial_u2slowpath.log` |
| `@sealed` 段标记（U3） | ⬜ | 未实现 | — |
| selftest（U5） | 🔶 | KAT/段表/越界已覆盖；chacha20 KAT 间歇 FAIL 待修 | `test/utsm_selftest.c` |
| 真实加密原语 | 🔶 | chacha20/KDF/MAC 已落（Phase 9 早期），PCKC schedule 待接 | `crypto/` |