// https://syzkaller.appspot.com/bug?id=4462682cd32aee8ff03a43c8b9be3963743bc506 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf)); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } 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; } } } } #ifndef __NR_mmap #define __NR_mmap 192 #endif #ifndef __NR_readv #define __NR_readv 145 #endif #ifndef __NR_write #define __NR_write 4 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 long r[1]; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xfc1000, 0x3, 0x32, 0xffffffff, 0x0); break; case 1: memcpy((void*)0x2002a000, "/dev/sg#", 9); r[0] = syz_open_dev(0x2002a000, 0x0, 0x142); break; case 2: *(uint32_t*)0x20fbff90 = 0x20c4afc1; *(uint32_t*)0x20fbff94 = 0xb7; *(uint32_t*)0x20fbff98 = 0x2086d000; *(uint32_t*)0x20fbff9c = 0x0; *(uint32_t*)0x20fbffa0 = 0x207ac000; *(uint32_t*)0x20fbffa4 = 0x0; *(uint32_t*)0x20fbffa8 = 0x20ddaf7e; *(uint32_t*)0x20fbffac = 0x0; *(uint32_t*)0x20fbffb0 = 0x20fbf000; *(uint32_t*)0x20fbffb4 = 0x0; *(uint32_t*)0x20fbffb8 = 0x20fbf000; *(uint32_t*)0x20fbffbc = 0x0; *(uint32_t*)0x20fbffc0 = 0x2093d000; *(uint32_t*)0x20fbffc4 = 0x0; syscall(__NR_readv, r[0], 0x20fbff90, 0x7); break; case 3: memcpy((void*)0x20016f2f, "\xae\x68\xb4\x1f\xaf\x67\x33\xc7\x68\xd9\xc7\x01\x80\x00" "\x00\xd6\x7d\xba\xa0\x10\x44\xc0\xd2\x66\x18\x82\x9a\x68" "\xb0\x1b\x6e\x8d\xec\xa9\x3b\x15\x9d\x00\xb4\x42\x48\x6f" "\x36\x2b\x69\x6d\x4a\x1d\x3b\x24\x76\x08\x8d\xbc\xbf\xae" "\x2b\x59\x28\x39\x71\x77\x5e\x7b\xfe\x1a\x71\x83\xbd\xb4" "\x45\x2a\x9c\xc9\x51\x85\x13\x48\x92\x51\x16\x42\x2e\x2c" "\x04\xeb\x79\xb4", 88); syscall(__NR_write, r[0], 0x20016f2f, 0x58); break; } } void test() { memset(r, -1, sizeof(r)); execute(4); collide = 1; execute(4); } int main() { loop(); return 0; }