// https://syzkaller.appspot.com/bug?id=e787621884b787402fe83bb9852906ac5cdc288a // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1) #define BITMASK_LEN_OFF(type, bf_off, bf_len) \ (type)(BITMASK_LEN(type, (bf_len)) << (bf_off)) #define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \ if ((bf_off) == 0 && (bf_len) == 0) { \ *(type*)(addr) = (type)(val); \ } else { \ type new_val = *(type*)(addr); \ new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \ new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \ *(type*)(addr) = new_val; \ } static void test(); void loop() { while (1) { test(); } } struct thread_t { int created, running, call; pthread_t th; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static int collide; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } static void execute(int num_calls) { int call, thread; running = 0; for (call = 0; call < num_calls; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); pthread_create(&th->th, &attr, thr, th); } if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); if (collide && call % 2) break; struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); if (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffff}; void execute_call(int call) { long res; switch (call) { case 0: memcpy((void*)0x20000100, "/dev/infiniband/rdma_cm", 24); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000100, 2, 0); if (res != -1) r[0] = res; break; case 1: *(uint32_t*)0x2025c000 = 2; *(uint32_t*)0x2025c004 = 0x70; *(uint8_t*)0x2025c008 = 0xe2; *(uint8_t*)0x2025c009 = 0; *(uint8_t*)0x2025c00a = 0; *(uint8_t*)0x2025c00b = 0; *(uint32_t*)0x2025c00c = 0; *(uint64_t*)0x2025c010 = 0; *(uint64_t*)0x2025c018 = 0; *(uint64_t*)0x2025c020 = 0; STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 0, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 1, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 2, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 3, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 4, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 1, 5, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 6, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 7, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 8, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 9, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 10, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 11, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 12, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 13, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 14, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 15, 2); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 17, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 18, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 19, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 20, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 21, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 22, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 23, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 24, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 25, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 26, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 27, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 28, 1); STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 29, 35); *(uint32_t*)0x2025c030 = 0; *(uint32_t*)0x2025c034 = 0; *(uint64_t*)0x2025c038 = 0x20000000; *(uint64_t*)0x2025c040 = 0; *(uint64_t*)0x2025c048 = 0; *(uint64_t*)0x2025c050 = 0; *(uint32_t*)0x2025c058 = 0; *(uint32_t*)0x2025c05c = 0; *(uint64_t*)0x2025c060 = 0; *(uint32_t*)0x2025c068 = 0; *(uint16_t*)0x2025c06c = 0; *(uint16_t*)0x2025c06e = 0; syscall(__NR_perf_event_open, 0x2025c000, 0, 0, -1, 0); break; case 2: *(uint32_t*)0x20001bc0 = 0; *(uint16_t*)0x20001bc4 = 0x18; *(uint16_t*)0x20001bc6 = 0xfa00; *(uint64_t*)0x20001bc8 = 0; *(uint64_t*)0x20001bd0 = 0x20001b80; *(uint16_t*)0x20001bd8 = 0x13f; *(uint8_t*)0x20001bda = 6; *(uint8_t*)0x20001bdb = 0; *(uint8_t*)0x20001bdc = 0; *(uint8_t*)0x20001bdd = 0; *(uint8_t*)0x20001bde = 0; *(uint8_t*)0x20001bdf = 0; res = syscall(__NR_write, r[0], 0x20001bc0, 0x20); if (res != -1) r[1] = *(uint32_t*)0x20001b80; break; case 3: *(uint32_t*)0x20000180 = 7; *(uint16_t*)0x20000184 = 8; *(uint16_t*)0x20000186 = 0xfa00; *(uint32_t*)0x20000188 = r[1]; *(uint32_t*)0x2000018c = 0; syscall(__NR_write, r[0], 0x20000180, 0x268); break; case 4: *(uint32_t*)0x200001c0 = 0x16; *(uint16_t*)0x200001c4 = 0x98; *(uint16_t*)0x200001c6 = 0xfa00; *(uint64_t*)0x200001c8 = 0x20000040; *(uint64_t*)0x200001d0 = 9; *(uint32_t*)0x200001d8 = r[1]; *(uint16_t*)0x200001dc = 0x10; *(uint16_t*)0x200001de = 1; *(uint16_t*)0x200001e0 = 2; *(uint16_t*)0x200001e2 = htobe16(0x4e23); *(uint32_t*)0x200001e4 = htobe32(0xe0000001); *(uint8_t*)0x200001e8 = 0; *(uint8_t*)0x200001e9 = 0; *(uint8_t*)0x200001ea = 0; *(uint8_t*)0x200001eb = 0; *(uint8_t*)0x200001ec = 0; *(uint8_t*)0x200001ed = 0; *(uint8_t*)0x200001ee = 0; *(uint8_t*)0x200001ef = 0; syscall(__NR_write, r[0], 0x200001c0, 0xa0); break; } } void test() { execute(5); collide = 1; execute(5); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (;;) { loop(); } }