┌─────────────────────────────────────────────────────────┐
│ 1. KASLR Leak       (prefetch side-channel via libxdk)  │
├─────────────────────────────────────────────────────────┤
│ 2. Race Trigger      (close-vs-close UAF on eventpoll)  │
│    ├─ Adaptive timer: stat/exec phases calibrate ahead  │
│    ├─ False-sharing:  dup()+close() widens race window  │
│    └─ Oracle:         EPOLL_CTL_ADD depth-3 → ELOOP?    │
├─────────────────────────────────────────────────────────┤
│ 3. Reclaim           (freed eventpoll → ep_uaf_target)  │
│    └─ Dangling epi->ffd.file in ep_uaf_waiter           │
├─────────────────────────────────────────────────────────┤
│ 4. Cross-Cache       (filp slab → buddy → pipe_buffer)  │
│    ├─ Drain per-CPU partial list                        │
│    ├─ Free enclosing objects → slab page freed          │
│    └─ Reclaim as pipe pages (256 × 4 KiB)              │
├─────────────────────────────────────────────────────────┤
│ 5. Constrained AAR   (fdinfo ino:/sdev: as read oracle) │
│    ├─ Fake file spray tiles forged struct file in pipe  │
│    ├─ 8B read: ino: ← i_ino at controlled offset       │
│    ├─ 4B read: sdev: ← sigaltstack(sas_ss_sp) cursor   │
│    └─ Walk: init_task → find exploit task → resolve     │
│       files → fdt → fd[] → pipe_buffer → struct page   │
├─────────────────────────────────────────────────────────┤
│ 6. RIP Control       (f_op→poll hijack → JOP → ROP)    │
│    ├─ Forge f_op = virt, f_count = virt - 1             │
│    ├─ JOP pivot chain lands rsp on controlled page      │
│    └─ libxdk ROP: commit_creds(init_cred) + ns switch  │
├─────────────────────────────────────────────────────────┤
│ 7. Ret2Usr           execve("/bin/bash") as root        │
└─────────────────────────────────────────────────────────┘

# aarch64 (cross-compile or native)
aarch64-linux-gnu-gcc -O2 -Wall -pthread -march=armv8-a \
    race_check_aarch64.c -o race_check

./race_check [timeout_seconds]   # default: 300s (5 min)
./race_check 120                 # 2-minute timeout