// https://syzkaller.appspot.com/bug?id=3c1f47967b7cbd399d3ba3e65f297a29aa1c5f92 // 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 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); 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_writev #define __NR_writev 146 #endif #ifndef __NR_readv #define __NR_readv 145 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 long r[1]; uint64_t procid; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0); break; case 1: memcpy((void*)0x20005000, "/dev/sg#", 9); r[0] = syz_open_dev(0x20005000, 0, 0x8002); break; case 2: *(uint32_t*)0x201b6f90 = 0x20e43000; *(uint32_t*)0x201b6f94 = 0x6a; *(uint32_t*)0x201b6f98 = 0x2012afff; *(uint32_t*)0x201b6f9c = 0; *(uint32_t*)0x201b6fa0 = 0x202f5f0b; *(uint32_t*)0x201b6fa4 = 0; *(uint32_t*)0x201b6fa8 = 0x20634f5d; *(uint32_t*)0x201b6fac = 0; *(uint32_t*)0x201b6fb0 = 0x202e3fa8; *(uint32_t*)0x201b6fb4 = 0; *(uint32_t*)0x201b6fb8 = 0x20de5f59; *(uint32_t*)0x201b6fbc = 0; *(uint32_t*)0x201b6fc0 = 0x20288000; *(uint32_t*)0x201b6fc4 = 0; memcpy((void*)0x20e43000, "\xe5\x9b\xc0\x53\xdc\xe4\x04\x31\x7b\xb5\x1f\x59\x7e\xa6\xfe\xb2" "\x7c\x63\x71\x10\x0c\xa6\xf5\xc5\x3d\xed\x1c\x2f\x0f\xd1\xc9\x2c" "\x1f\x80\x82\xc2\x12\xf7\xfe\xad\xb3\xaf\x9f\x07\x69\x4a\x7a\x99" "\x03\x07\x95\x98\xae\x4e\xf5\xd5\x9f\x23\x0f\xb5\x50\x1c\xc9\x70" "\xe2\x62\x4d\xb6\x29\x27\x59\xf2\x04\xd3\x0c\xf0\xd6\x34\x6d\x8e" "\xa5\xde\x77\x3c\x25\x57\xd5\xaa\x36\x7d\x15\x8c\x63\xff\xa7\x7b" "\x1f\x08\x77\x92\xca\x17\x5d\xb2\x19\x9c", 106); syscall(__NR_writev, r[0], 0x201b6f90, 7); break; case 3: *(uint32_t*)0x200b8fb0 = 0x2041bf1a; *(uint32_t*)0x200b8fb4 = 0; *(uint32_t*)0x200b8fb8 = 0x20858f42; *(uint32_t*)0x200b8fbc = 0; *(uint32_t*)0x200b8fc0 = 0x20a42ffe; *(uint32_t*)0x200b8fc4 = 0x1d; *(uint32_t*)0x200b8fc8 = 0x20e3f000; *(uint32_t*)0x200b8fcc = 0; *(uint32_t*)0x200b8fd0 = 0x20859ff7; *(uint32_t*)0x200b8fd4 = 0; syscall(__NR_readv, r[0], 0x200b8fb0, 5); break; } } void test() { memset(r, -1, sizeof(r)); execute(4); } int main() { for (procid = 0; procid < 8; procid++) { if (fork() == 0) { for (;;) { loop(); } } } sleep(1000000); return 0; }