// https://syzkaller.appspot.com/bug?id=7b424c7842078f9cd42221ccc836b1c45e0e29c7
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <pthread.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <util.h>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  dp = opendir(dir);
  if (dp == NULL)
    exit(1);
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename))
      exit(1);
  }
  closedir(dp);
  if (rmdir(dir))
    exit(1);
}

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);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

#define __syscall syscall

static uintptr_t syz_open_pts(void)
{
  int master, slave;
  if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
    return -1;
  if (dup2(master, master + 100) != -1)
    close(master);
  return slave;
}

static void sandbox_common()
{
  if (setsid() == -1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  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 execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 9; 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);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syz_open_pts();
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(memcpy(
        (void*)0x200006c0,
        "\x58\x27\x20\xef\xab\xd1\x6e\xba\xe6\x32\x25\x25\x95\x60\xf8\xe5\x81"
        "\x5f\x73\xf2\xa0\x44\xfd\x33\x05\x55\x52\xfb\xd5\xe4\x17\x89\x63\x2d"
        "\xfc\x94\xb0\x61\x98\x82\x4b\x3d\x03\x00\x00\x00\x7b\x3b\xd5\x79\x45"
        "\x6f\xc7\xd4\x09\x6e\x8c\x8b\x6b\x87\xcb\x2d\x72\xb8\xbc\xdb\x9a\x1b"
        "\xab\x5a\x41\x2f\xec\xe2\xa4\xf5\xf7\x28\x19\x3e\xf1\x6a\xb9\x3f\x12"
        "\xfc\x4d\x5f\x16\xb1\x36\xa5\xd0\x0d\x16\x28\xb5\x3a\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\xa4\x67\x8e\x48\x21\xb3\xf6\x6c\xb4\x48\xfa\xca"
        "\xfc\xcc\x77\x9e\x9b\x12\x23\xb1\xeb\xe0\x6a\xf2\x90\xaa\xf4\xb1\x07"
        "\xf6\x5c\xa4\x81\x57\xb1\xfd\xd5\x28\x2b\xaf\xba\x25\x4a\x77\x89\xb2"
        "\x7b\x3a\x09\xed\x20\x01\x5f\xbb\x06\x73\x03\x67\x66\x0d\x05\x2d\x7a"
        "\x83\x73\x58\x3b\xd4\x95\xaa\x5e\x98\x15\x83\x68\x64\xff\x85\x24\x19"
        "\x0f\xbc\x3c\x83\xb0\xb1\x0d\x62\x25\x8c\xbb\x43\x13\x7c\x9e\xfa\xc7"
        "\xc6\x1d\x51\x7b\x89\xca\x33\x61\xf4\x95\xcc\x05\x7e\x49\x63\x1f\x0a"
        "\x9f\x8c\x11\x24\x8a\x9b\xf4\xd1\xa6\x6e\xab\x49\x57\x19\x91\xc5\x50"
        "\x84\xbd\xb7\x56\x80\xce\x72\x93\xe0\xe6\xbe\x28\xa1\xa8\x7e\x1d\x92"
        "\x70\xd4\x79",
        258));
    syscall(SYS_write, r[0], 0x200006c0, 0x102);
    break;
  case 2:
    NONFAILING(memcpy(
        (void*)0x200004c0,
        "\x3e\x2a\x79\x13\xe4\xba\xd2\x1c\x71\x4f\x4d\xd3\x6a\x27\xe5\xe2\x7b"
        "\x21\x6d\x67\x35\x51\xc0\xc0\x1b\x3d\xfa\xf9\x0f\x05\x00\x00\x00\xe5"
        "\x52\xaa\xee\xfe\xaf\xf0\xf2\xc8\x5e\x28\x31\xc6\x1a\xd4\x49\x01\x1f"
        "\x78\x00\x00\x00\x00\x00\x00\x01\x3c\x1f\xe9\x00\x20\x49\xfa\x9d\xa3"
        "\x98\xbc\xd6\x2b\x10\x34\x34\x82\x0a\xbc\x4b\xca\xbb\xa3\x44\x40\x02"
        "\x00\x7e\x14\x29\x5f\xba\xab\xbb\xaf\xe2\x14\xde\xa7\x9d\x8e\x17\x36"
        "\xa0\x1e\xd0\x1d\x72\xf5\xdd\x1d\x95\xe8\xf6\xb9\xd3\xb3\xc1\x90\xfe"
        "\xf0\xc9\xea\x73\x90\x6e\x2a\xdd\xdc\xb9\x5a\xfd\xc2\x7b\x8c\x98\x31"
        "\x35\x1d\x74\x12\x2a\xb9\xbd\x51\x0e\xb0\x0b\xb2\xc4\xc7\xa1\x8e\xf0"
        "\x02\x35\x68\x5c\x20\x01\xfc\x17\x00\x00\xde\xee\x2f\x87\x3c\x1e\x71"
        "\x1d\x5b\x65\xd2\x71\x2d\x93\xae\x73\x1f\xfe\xe5\xa6\x27\xd0\x76\x71"
        "\x06\xbd\x31\xb4\x60\x5f\x1d\x00\x08\xfd\x32\x3e\x6a\x8b\xab\x89\x05"
        "\x73\x94\x67\x2c\x25\xbc\x15\xa6\x02",
        213));
    syscall(SYS_write, r[0], 0x200004c0, 0xd5);
    break;
  case 3:
    res = syz_open_pts();
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    syscall(SYS_close, r[1]);
    break;
  case 5:
    syscall(SYS_dup, r[1]);
    break;
  case 6:
    res = syz_open_pts();
    if (res != -1)
      r[2] = res;
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x20000200 = -1);
    NONFAILING(*(uint16_t*)0x20000204 = 0x20);
    NONFAILING(*(uint16_t*)0x20000206 = 0);
    NONFAILING(*(uint32_t*)0x20000208 = r[1]);
    NONFAILING(*(uint16_t*)0x2000020c = 0xa);
    NONFAILING(*(uint16_t*)0x2000020e = 0);
    NONFAILING(*(uint32_t*)0x20000210 = -1);
    NONFAILING(*(uint16_t*)0x20000214 = 5);
    NONFAILING(*(uint16_t*)0x20000216 = 0);
    NONFAILING(*(uint32_t*)0x20000218 = r[2]);
    NONFAILING(*(uint16_t*)0x2000021c = 0x100);
    NONFAILING(*(uint16_t*)0x2000021e = 0);
    NONFAILING(*(uint32_t*)0x20000220 = r[2]);
    NONFAILING(*(uint16_t*)0x20000224 = 1);
    NONFAILING(*(uint16_t*)0x20000226 = 0);
    NONFAILING(*(uint32_t*)0x20000228 = r[0]);
    NONFAILING(*(uint16_t*)0x2000022c = 0);
    NONFAILING(*(uint16_t*)0x2000022e = 0);
    NONFAILING(*(uint32_t*)0x20000230 = r[2]);
    NONFAILING(*(uint16_t*)0x20000234 = 0x100);
    NONFAILING(*(uint16_t*)0x20000236 = 0);
    NONFAILING(*(uint32_t*)0x20000238 = r[0]);
    NONFAILING(*(uint16_t*)0x2000023c = 0x140);
    NONFAILING(*(uint16_t*)0x2000023e = 0);
    NONFAILING(*(uint32_t*)0x20000240 = r[1]);
    NONFAILING(*(uint16_t*)0x20000244 = 0x80);
    NONFAILING(*(uint16_t*)0x20000246 = 0);
    syscall(SYS_poll, 0x20000200, 9, 0x5a77);
    break;
  case 8:
    syscall(SYS_fsync, r[0]);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0, 0);
  install_segv_handler();
  for (procid = 0; procid < 2; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}