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    if (hdr->rng_state == 0) hdr->rng_state = 1;
    hdr->total_size       = total;
    hdr->reader_slots_off = L.reader_slots;
    hdr->slots_off        = L.slots;
    __atomic_thread_fence(__ATOMIC_SEQ_CST);
}

static inline uint16_t *cf_slots(CfHandle *h) {
    /* Layer B: locate the slot array via the trusted compile-time layout, NOT
     * the attacker-writable hdr->slots_off -- a peer that corrupts slots_off in
     * shared memory must not be able to relocate the base outside the mapping.
     * Validation at open guarantees hdr->slots_off == cf_layout().slots for a
     * valid filter, so this is identical for valid data. */
    return (uint16_t *)((char *)h->base + cf_layout().slots);
}

static inline CfHandle *cf_setup(void *base, size_t map_size,
                                 const char *path, int backing_fd) {
    CfHeader *hdr = (CfHeader *)base;
    CfHandle *h = (CfHandle *)calloc(1, sizeof(CfHandle));
    if (!h) {