// https://syzkaller.appspot.com/bug?id=4c9c1b7813a6d4531a2782a893874061affc24bb // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include 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; for (i = 0; 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); } 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 < 10; 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, 45); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } #ifndef __NR_bpf #define __NR_bpf 321 #endif uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res; switch (call) { case 0: res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[0] = res; break; case 1: *(uint64_t*)0x20000040 = 0; *(uint32_t*)0x20000048 = 0x2a9; *(uint64_t*)0x20000050 = 0x20000000; *(uint64_t*)0x20000000 = 0x20000080; memcpy((void*)0x20000080, "\x48\x00\x00\x00\x10\x00\x05\x07\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00", 20); *(uint32_t*)0x20000094 = -1; memcpy((void*)0x20000098, "\x00\x00\x00\x00\x00\x00\x00\x00\x28\x00\x12\x00" "\x09\x00\x01\x00\x76\x65\x74\x68\x00\x00\x00\x00" "\x18\x00\x02\x00\x14\x00\x01\x00\x00\x00\x00" "\x00", 36); *(uint32_t*)0x200000bc = 0; memcpy((void*)0x200000c0, "\x40\x00\xb2\x00\x00\x00\x00\x00", 8); *(uint64_t*)0x20000008 = 0x48; *(uint64_t*)0x20000058 = 1; *(uint64_t*)0x20000060 = 0; *(uint64_t*)0x20000068 = 0; *(uint32_t*)0x20000070 = 0; syscall(__NR_sendmsg, r[0], 0x20000040ul, 0ul); break; case 2: res = syscall(__NR_pipe, 0x20000180ul); if (res != -1) { r[1] = *(uint32_t*)0x20000180; r[2] = *(uint32_t*)0x20000184; } break; case 3: res = syscall(__NR_socket, 2ul, 2ul, 0); if (res != -1) r[3] = res; break; case 4: *(uint32_t*)0x20000040 = 0; *(uint32_t*)0x20000044 = 2; *(uint32_t*)0x20000048 = 0; *(uint32_t*)0x2000004c = 0; *(uint32_t*)0x20000050 = 0; *(uint32_t*)0x20000054 = -1; *(uint32_t*)0x20000058 = 0; *(uint8_t*)0x2000005c = 0; *(uint8_t*)0x2000005d = 0; *(uint8_t*)0x2000005e = 0; *(uint8_t*)0x2000005f = 0; *(uint8_t*)0x20000060 = 0; *(uint8_t*)0x20000061 = 0; *(uint8_t*)0x20000062 = 0; *(uint8_t*)0x20000063 = 0; *(uint8_t*)0x20000064 = 0; *(uint8_t*)0x20000065 = 0; *(uint8_t*)0x20000066 = 0; *(uint8_t*)0x20000067 = 0; *(uint8_t*)0x20000068 = 0; *(uint8_t*)0x20000069 = 0; *(uint8_t*)0x2000006a = 0; *(uint8_t*)0x2000006b = 0; *(uint32_t*)0x2000006c = 0; *(uint32_t*)0x20000070 = -1; *(uint32_t*)0x20000074 = 0; *(uint32_t*)0x20000078 = 0; *(uint32_t*)0x2000007c = 0; syscall(__NR_bpf, 0ul, 0x20000040ul, 0x40ul); break; case 5: syscall(__NR_close, r[3]); break; case 6: syscall(__NR_socket, 0x10ul, 3ul, 0); break; case 7: *(uint64_t*)0x200000c0 = 0; *(uint32_t*)0x200000c8 = 0; *(uint64_t*)0x200000d0 = 0x20000200; *(uint64_t*)0x20000200 = 0x20000000; memcpy((void*)0x20000000, "\x48\x00\x00\x00\x10\x00\x1f\xff\x00\x00\x05\x00" "\x00\x00\x00\x00\x00\x00\x00\x00", 20); *(uint32_t*)0x20000014 = -1; memcpy((void*)0x20000018, "\x00\x00\x00\x00\x00\x00\x18\x00\x28\x00\x12\x80" "\x0a\x00\x01\x00\x76\x78\x6c\x61\x6e\x00\x00\x00" "\x18\x00\x02\x80\x14\x00\x10", 31); *(uint64_t*)0x20000208 = 3; *(uint64_t*)0x200000d8 = 1; *(uint64_t*)0x200000e0 = 0; *(uint64_t*)0x200000e8 = 0; *(uint32_t*)0x200000f0 = 0; syscall(__NR_sendmsg, -1, 0x200000c0ul, 0ul); break; case 8: syscall(__NR_write, r[2], 0x20000000ul, 0xfffffeccul); break; case 9: syscall(__NR_splice, r[1], 0ul, r[3], 0ul, 0x4ffe2ul, 0ul); break; } } int main(void) { syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0ul); loop(); return 0; }