# Stage1 build fixes (FR-017)

> **2026-09-26 audit:** The FORTIFY BUG stubs below are a historical link
> workaround, **not an accepted fix**. The latest ksync FORTIFY image fails
> boot according to the owner. Clang exclusion in Kconfig references an
> undefined CC_IS_CLANG symbol. See
> [the FORTIFY audit](../../../../docs/009-fortify-boot-audit-20260926.md)
> before reusing this workaround.

Applied on host `msm-4.14` when Stage1 Graphene/AH hit compile/link issues:

1. **slab 0014 misfuzz** — Graphene patch targeted `slab_equal_or_root`;
   fuzz applied to `is_root_cache`. Reverted `is_root_cache` to `return true`.
   LOS already has `slab_equal_or_root` → `s == p`.
2. **FORTIFY + Clang LTO (historical, invalid as ship fix)** —
   `CONFIG_FORTIFY_SOURCE=y` caused modpost undefined `__read_overflow*` /
   `__write_overflow` in qcacld/techpack. Temporary `BUG()` stubs were
   added in `lib/string.c` to force a link; LAB then failed to boot.
   **Do not reuse.** Real work: Clang FORTIFY port — see
   `docs/009-fortify-clang-port.md` and `docs/009-fortify-boot-audit-20260926.md`.

See `docs/009-kernel-hardening-map.md`.