Milestone 6: hard-refuse flip, scoped to INVALID only -- closes Milestone 6

Before flipping, found CAPSULE_SIG_MISSING (no signature at all) is the
normal state everywhere except this machine -- CI and any other
checkout have no access to the offline key, by design. Refusing on
MISSING the same as INVALID would brick boot everywhere but here.
Decided (on request): enforce ONLY on CAPSULE_SIG_INVALID (a signature
that IS present but doesn't verify -- unambiguous tampering/corruption
evidence). MISSING/NO_ROOT_KEY stay WARN-only permanently.

All three capsule_birth.c call sites now return CAPSULE_RUN_ERR_INVALID
on CAPSULE_SIG_INVALID, after logging the same WARN as before.

Verified on all three architectures, both directions, per the original
rollout commitment: positive case (real signed capsules) reboots clean
with zero warnings on amd64/aarch64/riscv64. Negative case (same
one-byte signature corruption used for the WARN-only proof, on Mama's
own init.4th) now genuinely refuses identically on all three:
"capsule sig: init.4th: INVALID" then "Init: Mama birth FAILED". The
feared "no ok> at all" blast radius didn't materialize -- kernel_main.c
already had graceful error handling for a failed Mama birth (log and
continue, pre-existing code); the kernel reaches a degraded ok> rather
than crashing, on all three architectures. Final acceptance pass (real
signed capsules, tampering reverted) clean on all three.

Milestone 6 is now fully closed except magic-number content-type
detection (shared with Milestone 4, separate scope, not started).
Documented in FABRIC-3.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U14ET9CWAtbQMbYqomKgXd

This commit is contained in:

Robert Allan James

2026-08-26 22:08:20 -04:00

co-authored by

Claude Sonnet 5

parent c640f99211

commit 030a3e6dc0

11 changed files with 63302 additions and 13 deletions

									
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				# Capsule Block Manifest — Auto-generated

				<!-- Generated by mkcapsule --manifest  2026-08-27T01:40:17Z -->

				<!-- Generated by mkcapsule --manifest  2026-08-27T02:05:00Z -->

				<!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh.  -->

				<!-- Hand-written justifications and immutability notes live  -->

				<!-- in MANIFEST.md alongside this auto-generated index.      -->