// https://syzkaller.appspot.com/bug?id=2f81cf20209e41c9e0224ab5f8e7ffecbf7bd85a // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #ifndef __NR_bpf #define __NR_bpf 321 #endif static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); int i = 0; for (; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) typedef struct { int state; } event_t; static void event_init(event_t* ev) { ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { if (ev->state) exit(1); __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); } static int event_isset(event_t* ev) { return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; for (;;) { uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } struct thread_t { int created, call; event_t ready, done; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void loop(void) { int i, call, thread; for (call = 0; call < 3; call++) { for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); event_timedwait(&th->done, 50 + (call == 2 ? 500 : 0)); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: *(uint32_t*)0x200009c0 = 0x12; *(uint32_t*)0x200009c4 = 6; *(uint32_t*)0x200009c8 = 8; *(uint32_t*)0x200009cc = 5; *(uint32_t*)0x200009d0 = 0; *(uint32_t*)0x200009d4 = -1; *(uint32_t*)0x200009d8 = 0; memset((void*)0x200009dc, 0, 16); *(uint32_t*)0x200009ec = 0; *(uint32_t*)0x200009f0 = -1; *(uint32_t*)0x200009f4 = 0; *(uint32_t*)0x200009f8 = 0; *(uint32_t*)0x200009fc = 0; *(uint64_t*)0x20000a00 = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul); if (res != -1) r[0] = res; break; case 1: *(uint32_t*)0x200000c0 = 0x11; *(uint32_t*)0x200000c4 = 0xc; *(uint64_t*)0x200000c8 = 0x200001c0; *(uint8_t*)0x200001c0 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 4, 4); *(uint16_t*)0x200001c2 = 0; *(uint32_t*)0x200001c4 = 0; *(uint8_t*)0x200001c8 = 0; *(uint8_t*)0x200001c9 = 0; *(uint16_t*)0x200001ca = 0; *(uint32_t*)0x200001cc = 0; *(uint8_t*)0x200001d0 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200001d1, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001d1, 1, 4, 4); *(uint16_t*)0x200001d2 = 0; *(uint32_t*)0x200001d4 = r[0]; *(uint8_t*)0x200001d8 = 0; *(uint8_t*)0x200001d9 = 0; *(uint16_t*)0x200001da = 0; *(uint32_t*)0x200001dc = 0; STORE_BY_BITMASK(uint8_t, , 0x200001e0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001e0, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001e0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001e1, 8, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001e1, 0, 4, 4); *(uint16_t*)0x200001e2 = 0; *(uint32_t*)0x200001e4 = 0; STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x200001e9, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001e9, 8, 4, 4); *(uint16_t*)0x200001ea = 0xfff8; *(uint32_t*)0x200001ec = 0; STORE_BY_BITMASK(uint8_t, , 0x200001f0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001f0, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001f0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f1, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f1, 0xa, 4, 4); *(uint16_t*)0x200001f2 = 0; *(uint32_t*)0x200001f4 = 0; STORE_BY_BITMASK(uint8_t, , 0x200001f8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001f8, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001f8, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f9, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f9, 0, 4, 4); *(uint16_t*)0x200001fa = 0; *(uint32_t*)0x200001fc = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x20000200, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000200, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000200, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000201, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000201, 0, 4, 4); *(uint16_t*)0x20000202 = 0; *(uint32_t*)0x20000204 = 8; STORE_BY_BITMASK(uint8_t, , 0x20000208, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000208, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000208, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000209, 4, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000209, 0, 4, 4); *(uint16_t*)0x2000020a = 0; *(uint32_t*)0x2000020c = 0; *(uint8_t*)0x20000210 = 0x85; *(uint8_t*)0x20000211 = 0; *(uint16_t*)0x20000212 = 0; *(uint32_t*)0x20000214 = 3; *(uint8_t*)0x20000218 = 0x95; *(uint8_t*)0x20000219 = 0; *(uint16_t*)0x2000021a = 0; *(uint32_t*)0x2000021c = 0; *(uint64_t*)0x200000d0 = 0x20000240; memcpy((void*)0x20000240, "GPL\000", 4); *(uint32_t*)0x200000d8 = 0; *(uint32_t*)0x200000dc = 0; *(uint64_t*)0x200000e0 = 0; *(uint32_t*)0x200000e8 = 0; *(uint32_t*)0x200000ec = 0; memset((void*)0x200000f0, 0, 16); *(uint32_t*)0x20000100 = 0; *(uint32_t*)0x20000104 = 0; *(uint32_t*)0x20000108 = -1; *(uint32_t*)0x2000010c = 0; *(uint64_t*)0x20000110 = 0; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint64_t*)0x20000120 = 0; *(uint32_t*)0x20000128 = 0; *(uint32_t*)0x2000012c = 0; *(uint32_t*)0x20000130 = 0; *(uint32_t*)0x20000134 = 0; *(uint64_t*)0x20000138 = 0; *(uint64_t*)0x20000140 = 0; *(uint32_t*)0x20000148 = 0; *(uint32_t*)0x2000014c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul); if (res != -1) r[1] = res; break; case 2: *(uint64_t*)0x20000540 = 0x20000040; memcpy((void*)0x20000040, "sched_switch\000", 13); *(uint32_t*)0x20000548 = r[1]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000540ul, /*size=*/0x10ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); loop(); return 0; }