// https://syzkaller.appspot.com/bug?id=7c7bd742d3b6b7473427759ad255c581dbd94412 // 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; \ } struct csum_inet { uint32_t acc; }; static void csum_inet_init(struct csum_inet* csum) { csum->acc = 0; } static void csum_inet_update(struct csum_inet* csum, const uint8_t* data, size_t length) { if (length == 0) return; size_t i; for (i = 0; i < length - 1; i += 2) csum->acc += *(uint16_t*)&data[i]; if (length & 1) csum->acc += (uint16_t)data[length - 1]; while (csum->acc > 0xffff) csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16); } static uint16_t csum_inet_digest(struct csum_inet* csum) { return ~csum->acc; } 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; } } } } long r[2]; uint64_t procid; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0); break; case 1: r[0] = syscall(__NR_socket, 2, 1, 0); break; case 2: *(uint32_t*)0x2039c000 = 1; syscall(__NR_setsockopt, r[0], 6, 0x10000000013, 0x2039c000, 4); break; case 3: *(uint32_t*)0x20383000 = 1; syscall(__NR_setsockopt, r[0], 6, 0x14, 0x20383000, 4); break; case 4: r[1] = syscall(__NR_dup, r[0]); break; case 5: *(uint16_t*)0x20e45ff0 = 2; *(uint16_t*)0x20e45ff2 = 0; *(uint32_t*)0x20e45ff4 = htobe32(0x7f000001); *(uint8_t*)0x20e45ff8 = 0; *(uint8_t*)0x20e45ff9 = 0; *(uint8_t*)0x20e45ffa = 0; *(uint8_t*)0x20e45ffb = 0; *(uint8_t*)0x20e45ffc = 0; *(uint8_t*)0x20e45ffd = 0; *(uint8_t*)0x20e45ffe = 0; *(uint8_t*)0x20e45fff = 0; syscall(__NR_sendto, r[0], 0x20482000, 0xffffffffffffff56, 0x800000120000401, 0x20e45ff0, 0x10); break; case 6: *(uint64_t*)0x20789fc8 = 0x20ca4ff4; *(uint32_t*)0x20789fd0 = 0xc; *(uint64_t*)0x20789fd8 = 0x20126000; *(uint64_t*)0x20789fe0 = 1; *(uint64_t*)0x20789fe8 = 0; *(uint64_t*)0x20789ff0 = 0; *(uint32_t*)0x20789ff8 = 0; *(uint16_t*)0x20ca4ff4 = 0x10; *(uint16_t*)0x20ca4ff6 = 0; *(uint32_t*)0x20ca4ff8 = 0; *(uint32_t*)0x20ca4ffc = 0; *(uint64_t*)0x20126000 = 0x209ebfa0; *(uint64_t*)0x20126008 = 0x4c; *(uint32_t*)0x209ebfa0 = 0x4c; *(uint16_t*)0x209ebfa4 = 0x20; *(uint16_t*)0x209ebfa6 = 0; *(uint32_t*)0x209ebfa8 = 0; *(uint32_t*)0x209ebfac = 0; *(uint8_t*)0x209ebfb0 = 0; *(uint32_t*)0x209ebfb4 = htobe32(-1); *(uint8_t*)0x209ebfc4 = 0xfe; *(uint8_t*)0x209ebfc5 = 0x80; *(uint8_t*)0x209ebfc6 = 0; *(uint8_t*)0x209ebfc7 = 0; *(uint8_t*)0x209ebfc8 = 0; *(uint8_t*)0x209ebfc9 = 0; *(uint8_t*)0x209ebfca = 0; *(uint8_t*)0x209ebfcb = 0; *(uint8_t*)0x209ebfcc = 0; *(uint8_t*)0x209ebfcd = 0; *(uint8_t*)0x209ebfce = 0; *(uint8_t*)0x209ebfcf = 0; *(uint8_t*)0x209ebfd0 = 0; *(uint8_t*)0x209ebfd1 = 0; *(uint8_t*)0x209ebfd2 = 0; *(uint8_t*)0x209ebfd3 = 0xbb; *(uint16_t*)0x209ebfd4 = 0; *(uint16_t*)0x209ebfd6 = htobe16(0); *(uint16_t*)0x209ebfd8 = 0; *(uint16_t*)0x209ebfda = htobe16(0); *(uint16_t*)0x209ebfdc = 0; *(uint8_t*)0x209ebfde = 0; *(uint8_t*)0x209ebfdf = 0; *(uint8_t*)0x209ebfe0 = 0; *(uint32_t*)0x209ebfe4 = 0; *(uint32_t*)0x209ebfe8 = 0; syscall(__NR_sendmsg, r[1], 0x20789fc8, 0); break; case 7: memcpy((void*)0x20003f61, "\x0d\x4d\xde\xfa\xf6\x76", 6); *(uint8_t*)0x20003f67 = 0xaa; *(uint8_t*)0x20003f68 = 0xaa; *(uint8_t*)0x20003f69 = 0xaa; *(uint8_t*)0x20003f6a = 0xaa; *(uint8_t*)0x20003f6b = 0; *(uint8_t*)0x20003f6c = 0xaa; *(uint16_t*)0x20003f6d = htobe16(0x86dd); STORE_BY_BITMASK(uint8_t, 0x20003f6f, 0, 0, 4); STORE_BY_BITMASK(uint8_t, 0x20003f6f, 6, 4, 4); memcpy((void*)0x20003f70, "v`Q", 3); *(uint16_t*)0x20003f73 = htobe16(0x30); *(uint8_t*)0x20003f75 = 0x29; *(uint8_t*)0x20003f76 = 0; *(uint8_t*)0x20003f77 = 0xfe; *(uint8_t*)0x20003f78 = 0x80; *(uint8_t*)0x20003f79 = 0; *(uint8_t*)0x20003f7a = 0; *(uint8_t*)0x20003f7b = 0; *(uint8_t*)0x20003f7c = 0; *(uint8_t*)0x20003f7d = 0; *(uint8_t*)0x20003f7e = 0; *(uint8_t*)0x20003f7f = 0; *(uint8_t*)0x20003f80 = 0; *(uint8_t*)0x20003f81 = 0; *(uint8_t*)0x20003f82 = 0; *(uint8_t*)0x20003f83 = 0; *(uint8_t*)0x20003f84 = 0; *(uint8_t*)0x20003f85 = 0; *(uint8_t*)0x20003f86 = 0xbb; *(uint8_t*)0x20003f87 = -1; *(uint8_t*)0x20003f88 = 2; *(uint8_t*)0x20003f89 = 0; *(uint8_t*)0x20003f8a = 0; *(uint8_t*)0x20003f8b = 0; *(uint8_t*)0x20003f8c = 0; *(uint8_t*)0x20003f8d = 0; *(uint8_t*)0x20003f8e = 0; *(uint8_t*)0x20003f8f = 0; *(uint8_t*)0x20003f90 = 0; *(uint8_t*)0x20003f91 = 0; *(uint8_t*)0x20003f92 = 0; *(uint8_t*)0x20003f93 = 0; *(uint8_t*)0x20003f94 = 0; *(uint8_t*)0x20003f95 = 0; *(uint8_t*)0x20003f96 = 1; *(uint8_t*)0x20003f97 = 1; *(uint8_t*)0x20003f98 = 0; *(uint16_t*)0x20003f99 = 0; *(uint8_t*)0x20003f9b = 0; *(uint8_t*)0x20003f9c = 0; *(uint8_t*)0x20003f9d = 0; *(uint8_t*)0x20003f9e = 0; STORE_BY_BITMASK(uint8_t, 0x20003f9f, 0, 0, 4); STORE_BY_BITMASK(uint8_t, 0x20003f9f, 6, 4, 4); memcpy((void*)0x20003fa0, "\xf3\xe0\x1e", 3); *(uint16_t*)0x20003fa3 = htobe16(0); *(uint8_t*)0x20003fa5 = 0; *(uint8_t*)0x20003fa6 = 0; *(uint8_t*)0x20003fa7 = 0xfe; *(uint8_t*)0x20003fa8 = 0x80; *(uint8_t*)0x20003fa9 = 0; *(uint8_t*)0x20003faa = 0; *(uint8_t*)0x20003fab = 0; *(uint8_t*)0x20003fac = 0; *(uint8_t*)0x20003fad = 0; *(uint8_t*)0x20003fae = 0; *(uint8_t*)0x20003faf = 0; *(uint8_t*)0x20003fb0 = 0; *(uint8_t*)0x20003fb1 = 0; *(uint8_t*)0x20003fb2 = 0; *(uint8_t*)0x20003fb3 = 0; *(uint8_t*)0x20003fb4 = 0; *(uint8_t*)0x20003fb5 = 0; *(uint8_t*)0x20003fb6 = 0; *(uint8_t*)0x20003fb7 = 0xfe; *(uint8_t*)0x20003fb8 = 0x80; *(uint8_t*)0x20003fb9 = 0; *(uint8_t*)0x20003fba = 0; *(uint8_t*)0x20003fbb = 0; *(uint8_t*)0x20003fbc = 0; *(uint8_t*)0x20003fbd = 0; *(uint8_t*)0x20003fbe = 0; *(uint8_t*)0x20003fbf = 0; *(uint8_t*)0x20003fc0 = 0; *(uint8_t*)0x20003fc1 = 0; *(uint8_t*)0x20003fc2 = 0; *(uint8_t*)0x20003fc3 = 0; *(uint8_t*)0x20003fc4 = 0; *(uint8_t*)0x20003fc5 = 0; *(uint8_t*)0x20003fc6 = 0xbb; struct csum_inet csum_1; csum_inet_init(&csum_1); csum_inet_update(&csum_1, (const uint8_t*)0x20003f77, 16); csum_inet_update(&csum_1, (const uint8_t*)0x20003f87, 16); uint32_t csum_1_chunk_2 = 0x30000000; csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4); uint32_t csum_1_chunk_3 = 0x3a000000; csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4); csum_inet_update(&csum_1, (const uint8_t*)0x20003f97, 48); *(uint16_t*)0x20003f99 = csum_inet_digest(&csum_1); break; } } void test() { memset(r, -1, sizeof(r)); execute(8); collide = 1; execute(8); } int main() { for (procid = 0; procid < 8; procid++) { if (fork() == 0) { for (;;) { loop(); } } } sleep(1000000); return 0; }