// https://syzkaller.appspot.com/bug?id=3c27eae7bdba97293b68e79c9700ac110f977eed // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include __attribute__((noreturn)) static void doexit(int status) { volatile unsigned i; syscall(__NR_exit_group, status); for (i = 0;; i++) { } } #include #include #include #include #include const int kFailStatus = 67; const int kRetryStatus = 69; static void fail(const char* msg, ...) { int e = errno; va_list args; va_start(args, msg); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, " (errno %d)\n", e); doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus); } #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 uint64_t current_time_ms() { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) fail("clock_gettime failed"); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void execute_one(); extern unsigned long long procid; static void loop() { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) fail("clone failed"); if (pid == 0) { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); execute_one(); int fd; for (fd = 3; fd < 30; fd++) close(fd); doexit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { int res = waitpid(-1, &status, __WALL | WNOHANG); if (res == pid) { break; } usleep(1000); if (current_time_ms() - start < 5 * 1000) continue; kill(-pid, SIGKILL); kill(pid, SIGKILL); while (waitpid(-1, &status, __WALL) != pid) { } break; } } } 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 (__atomic_load_n(&running, __ATOMIC_RELAXED)) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } uint64_t r[4] = {0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: res = syscall(__NR_getpgrp, 0); if (res != -1) r[0] = res; break; case 1: syscall(__NR_clock_gettime, 5, 0x20000280); break; case 2: *(uint32_t*)0x200000c0 = 2; *(uint32_t*)0x200000c4 = 0x70; *(uint8_t*)0x200000c8 = 0xfd; *(uint8_t*)0x200000c9 = 0; *(uint8_t*)0x200000ca = 0; *(uint8_t*)0x200000cb = 0; *(uint32_t*)0x200000cc = 0; *(uint64_t*)0x200000d0 = 0; *(uint64_t*)0x200000d8 = 0; *(uint64_t*)0x200000e0 = 0; STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 0, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 5, 1, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 2, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 3, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 4, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 5, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 6, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 7, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 8, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 9, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 10, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 11, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 12, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 13, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 14, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 15, 2); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 17, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 18, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 19, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 20, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 21, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 22, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 23, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 24, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 25, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 26, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 27, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 28, 1); STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 29, 35); *(uint32_t*)0x200000f0 = 0; *(uint32_t*)0x200000f4 = 0; *(uint64_t*)0x200000f8 = 0x20000000; *(uint64_t*)0x20000100 = 0; *(uint64_t*)0x20000108 = 0; *(uint64_t*)0x20000110 = 0; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint64_t*)0x20000120 = 0; *(uint32_t*)0x20000128 = 0; *(uint16_t*)0x2000012c = 0; *(uint16_t*)0x2000012e = 0; syscall(__NR_perf_event_open, 0x200000c0, r[0], 0, -1, 0); break; case 3: memcpy((void*)0x20000380, "/selinux/commit_pending_bools", 30); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000380, 1, 0); if (res != -1) r[1] = res; break; case 4: syscall(__NR_ioctl, r[1], 0x5427); break; case 5: res = syscall(__NR_socket, 0xa, 2, 0); if (res != -1) r[2] = res; break; case 6: res = syscall(__NR_socket, 0x18, 1, 1); if (res != -1) r[3] = res; break; case 7: *(uint16_t*)0x205fafd2 = 0x18; *(uint32_t*)0x205fafd4 = 1; *(uint32_t*)0x205fafd8 = 0; *(uint32_t*)0x205fafdc = r[2]; *(uint16_t*)0x205fafe0 = 2; *(uint16_t*)0x205fafe2 = htobe16(0); *(uint32_t*)0x205fafe4 = htobe32(0xe0000002); *(uint8_t*)0x205fafe8 = 0; *(uint8_t*)0x205fafe9 = 0; *(uint8_t*)0x205fafea = 0; *(uint8_t*)0x205fafeb = 0; *(uint8_t*)0x205fafec = 0; *(uint8_t*)0x205fafed = 0; *(uint8_t*)0x205fafee = 0; *(uint8_t*)0x205fafef = 0; *(uint32_t*)0x205faff0 = 4; *(uint32_t*)0x205faff4 = 0; *(uint32_t*)0x205faff8 = 0; *(uint32_t*)0x205faffc = 0; syscall(__NR_connect, r[3], 0x205fafd2, 0x2e); break; case 8: *(uint32_t*)0x20000040 = 1; *(uint32_t*)0x20000044 = 0x70; *(uint8_t*)0x20000048 = 0; *(uint8_t*)0x20000049 = 0; *(uint8_t*)0x2000004a = 0; *(uint8_t*)0x2000004b = 0; *(uint32_t*)0x2000004c = 0; *(uint64_t*)0x20000050 = 0x50d; *(uint64_t*)0x20000058 = 0; *(uint64_t*)0x20000060 = 0; STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 0, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 1, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 2, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 3, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 4, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 5, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 6, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 7, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 8, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 9, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 10, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 11, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 12, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 13, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 14, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 15, 2); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 17, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 18, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 19, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 20, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 21, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 22, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 23, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 3, 24, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 25, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 26, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 27, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 28, 1); STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 29, 35); *(uint32_t*)0x20000070 = 0; *(uint32_t*)0x20000074 = 0; *(uint64_t*)0x20000078 = 0x20000000; *(uint64_t*)0x20000080 = 0; *(uint64_t*)0x20000088 = 0; *(uint64_t*)0x20000090 = 0; *(uint32_t*)0x20000098 = 0; *(uint32_t*)0x2000009c = 4; *(uint64_t*)0x200000a0 = 0; *(uint32_t*)0x200000a8 = 0; *(uint16_t*)0x200000ac = 0; *(uint16_t*)0x200000ae = 0; syscall(__NR_perf_event_open, 0x20000040, 0, 0, -1, 0); break; case 9: syscall(__NR_close, r[3]); break; } } void execute_one() { execute(10); collide = 1; execute(10); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (;;) { loop(); } }