// https://syzkaller.appspot.com/bug?id=1c20c6a19b4ce4dd1c6bd88440023ae45e607dba // 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 #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 = 0; for (; 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); } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) 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; } } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } static long syz_open_dev(volatile long a0, volatile long a1, volatile long 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) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static long syz_open_procfs(volatile long a0, volatile long a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == -1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int 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) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } 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 < 8; 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, 50); 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 = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); 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 < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[1] = {0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: *(uint32_t*)0x20000300 = 1; *(uint32_t*)0x20000304 = 0x80; *(uint8_t*)0x20000308 = 0; *(uint8_t*)0x20000309 = 0; *(uint8_t*)0x2000030a = 0; *(uint8_t*)0x2000030b = 0; *(uint32_t*)0x2000030c = 0; *(uint64_t*)0x20000310 = 0x61c1; *(uint64_t*)0x20000318 = 0; *(uint64_t*)0x20000320 = 0; STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 3, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 29, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 30, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 31, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 32, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 33, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 34, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 35, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 36, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 37, 1); STORE_BY_BITMASK(uint64_t, , 0x20000328, 0, 38, 26); *(uint32_t*)0x20000330 = 0; *(uint32_t*)0x20000334 = 0; *(uint64_t*)0x20000338 = 0; *(uint64_t*)0x20000340 = 0; *(uint64_t*)0x20000348 = 1; *(uint64_t*)0x20000350 = 0; *(uint32_t*)0x20000358 = 0; *(uint32_t*)0x2000035c = 0; *(uint64_t*)0x20000360 = 0; *(uint32_t*)0x20000368 = 0; *(uint16_t*)0x2000036c = 0; *(uint16_t*)0x2000036e = 0; *(uint32_t*)0x20000370 = 0; *(uint32_t*)0x20000374 = 0; *(uint64_t*)0x20000378 = 0; syscall(__NR_perf_event_open, 0x20000300ul, 0, -1ul, -1, 0ul); break; case 1: *(uint32_t*)0x200002c0 = 0; syscall(__NR_sched_setscheduler, 0, 5ul, 0x200002c0ul); break; case 2: memcpy((void*)0x20000000, "net/protocols\000", 14); res = -1; res = syz_open_procfs(-1, 0x20000000); if (res != -1) r[0] = res; break; case 3: syscall(__NR_lseek, r[0], 0x3fff80ul, 0ul); break; case 4: memcpy((void*)0x20000180, "syztnl2\000\000\000\000\000\000\000\000\000", 16); *(uint64_t*)0x20000190 = 0x20000100; memcpy((void*)0x20000100, "syztnl1\000\000\000\000\000\000\000\000\000", 16); *(uint32_t*)0x20000110 = 0; *(uint8_t*)0x20000114 = 0x2f; *(uint8_t*)0x20000115 = 2; *(uint8_t*)0x20000116 = 2; *(uint32_t*)0x20000118 = htobe32(2); *(uint32_t*)0x2000011c = 0x48; *(uint8_t*)0x20000120 = 0xfc; *(uint8_t*)0x20000121 = 1; memset((void*)0x20000122, 0, 13); *(uint8_t*)0x2000012f = 1; *(uint64_t*)0x20000130 = htobe64(0); *(uint64_t*)0x20000138 = htobe64(1); *(uint16_t*)0x20000140 = htobe16(4); *(uint16_t*)0x20000142 = htobe16(0x20); *(uint32_t*)0x20000144 = htobe32(2); *(uint32_t*)0x20000148 = htobe32(0); syscall(__NR_ioctl, r[0], 0x89f7, 0x20000180ul); break; case 5: *(uint32_t*)0x20000040 = 0x47; syscall(__NR_sched_setscheduler, -1, 5ul, 0x20000040ul); break; case 6: syscall(__NR_openat, 0xffffffffffffff9cul, 0ul, 0ul, 0ul); break; case 7: syz_open_dev(0, 0, 0); break; } } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); loop(); return 0; }