KeyStoreManager.grantKeyAccess() became a public app API only in
Android 16 (API 36). Before that grant was a hidden API and SELinux
denied untrusted_app, so a real Android 15 device answers a private-
binder grant() with PERMISSION_DENIED.
The virtualized grant plane (5579b16) issued a synthetic grant on every
SDK, exposing a capability a real Android 15 app does not have. Gate
grant() and ungrant() on SDK_INT >= 36: pre-36 returns PERMISSION_DENIED
for synthetic keys (matching the real device, which Duck then marks
UNAVAILABLE rather than a tell); 36+ keeps the coherent virtualized
grant.
On-device 23106RN0DA (SDK 35): all four grant rows report UNAVAILABLE,
not RED; tamper score unaffected.
Refs Phase 9 .omc/plans/tee-fingerprint-phase-9-grant-plane-coherence.md
Enginex0
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