ra8_dfu_antirollback.c File Reference

DFU anti-rollback (downgrade protection) – policy + storage seam. More...

#include "ra8_dfu_antirollback.h"

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Detailed Description

DFU anti-rollback (downgrade protection) – policy + storage seam.

Tag

[Ring 4 / Service] {World: S}

See ra8_dfu_antirollback.h for the full contract. This file owns the pure downgrade policy, the verify-and-commit flow over the injected storage vtable, and the non-faking default store. No raw MMIO is performed here: the non-volatile counter is reached only through the ra8_rot_antirollback_store_t function pointers.

The whole module is opt-in behind RA8_ENABLE_ROOT_OF_TRUST (default OFF), mirroring ra8_rot.c. With the flag OFF this file compiles to nothing – only the link-free declarations from ra8_dfu_antirollback.h – so the default build is byte-for-byte unchanged and pulls in no extra link dependency.

Copyright

Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Definition in file ra8_dfu_antirollback.c.