// https://syzkaller.appspot.com/bug?id=913598f2ef4504460d88ae845830e245d00debd5 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include unsigned long long procid; 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); if (pthread_create(&th, &attr, fn, arg)) exit(1); pthread_attr_destroy(&attr); } #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; \ } 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); } 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_RELAXED)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } #define SYZ_HAVE_SETUP_TEST 1 static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); } #define SYZ_HAVE_RESET_TEST 1 static void reset_test() { int fd; for (fd = 3; fd < 30; fd++) close(fd); } 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 execute_one(void) { int i, call, thread; for (call = 0; call < 12; 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); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); reset_test(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: *(uint32_t*)0x20000200 = 5; *(uint32_t*)0x20000204 = 0x70; *(uint8_t*)0x20000208 = 0; *(uint8_t*)0x20000209 = 0; *(uint8_t*)0x2000020a = 0; *(uint8_t*)0x2000020b = 0; *(uint32_t*)0x2000020c = 0; *(uint64_t*)0x20000210 = 6; *(uint64_t*)0x20000218 = 0; *(uint64_t*)0x20000220 = 0; STORE_BY_BITMASK(uint64_t, 0x20000228, 0x8000000000, 0, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 1, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 2, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 3, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 4, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 5, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0x3ff, 6, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 2, 7, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 8, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 9, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0x81, 10, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 11, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 12, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 13, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 14, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 15, 2); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 17, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 18, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 19, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0x4000000000, 20, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 21, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 22, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 23, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 24, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 25, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 26, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 27, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 28, 1); STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 29, 35); *(uint32_t*)0x20000230 = 0; *(uint32_t*)0x20000234 = 4; *(uint64_t*)0x20000238 = 0x200001c0; *(uint64_t*)0x20000240 = 8; *(uint64_t*)0x20000248 = 0x40000; *(uint64_t*)0x20000250 = 0; *(uint32_t*)0x20000258 = -1; *(uint32_t*)0x2000025c = 0; *(uint64_t*)0x20000260 = 0; *(uint32_t*)0x20000268 = 0; *(uint16_t*)0x2000026c = 0; *(uint16_t*)0x2000026e = 0; res = syscall(__NR_perf_event_open, 0x20000200, -1, 0, -1, 0); if (res != -1) r[0] = res; break; case 1: syscall(__NR_ioctl, r[0], 0x40082404, 0); break; case 2: *(uint64_t*)0x20000180 = 0x20000000; *(uint64_t*)0x20000188 = 0x92; *(uint64_t*)0x20000190 = 0x200000c0; *(uint64_t*)0x20000198 = 5; *(uint64_t*)0x200001a0 = 0x20000100; *(uint64_t*)0x200001a8 = 0x41; *(uint64_t*)0x200001b0 = 0x20000280; *(uint64_t*)0x200001b8 = 0x78; syscall(__NR_preadv, r[0], 0x20000180, 4, 0x58); break; case 3: memcpy((void*)0x20b4508a, "/dev/ashmem", 12); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20b4508a, 0, 0); if (res != -1) r[1] = res; break; case 4: syscall(__NR_ioctl, r[1], 0x40087703, 6); break; case 5: syscall(__NR_mmap, 0x206ff000, 0x3000, 0, 0x12, r[1], 0); break; case 6: memcpy((void*)0x20000000, "", 1); syscall(__NR_ioctl, r[1], 0x40087708, 0x20000000); break; case 7: syscall(__NR_ioctl, r[1], 0x770a, 0); break; case 8: memcpy((void*)0x20000140, "\x2b\x8b\x8a\x16\x11\x4f\xdd\xdf\x6b\x28\x46\x99" "\xdf\x92\xd5\x3e\x6f\x4a\x02\x75\x9b\x94\x61" "\xac", 24); res = syscall(__NR_memfd_create, 0x20000140, 3); if (res != -1) r[2] = res; break; case 9: *(uint32_t*)0x20000c40 = -1; syscall(__NR_write, r[2], 0x20000c40, 0xff67); break; case 10: *(uint64_t*)0x20000000 = 0; syscall(__NR_sendfile, -1, r[2], 0x20000000, 0xffff); break; case 11: syscall(__NR_fcntl, r[2], 0x409, 8); break; } } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }