// https://syzkaller.appspot.com/bug?id=a2c1393a92634b515391d1e54519dda3fd87e86c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>

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);
}

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  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);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

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

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &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);

#define CLONE_NEWCGROUP 0x02000000

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(CLONE_NEWCGROUP)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }

  loop();
  doexit(1);
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

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 (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

#ifndef __NR_close
#define __NR_close 6
#endif
#ifndef __NR_dup2
#define __NR_dup2 63
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_recvmsg
#define __NR_recvmsg 372
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_connect
#define __NR_connect 362
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[4];
void execute_call(int call)
{
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x209b2ff4, "/dev/autofs", 12));
    r[0] = syscall(__NR_openat, 0xffffff9c, 0x209b2ff4, 0x80000, 0);
    break;
  case 1:
    syscall(__NR_mmap, 0x20000000, 0x1000, 3, 0x32, -1, 0);
    break;
  case 2:
    syscall(__NR_mmap, 0x20000000, 0x1000, 3, 0x32, -1, 0);
    break;
  case 3:
    syscall(__NR_mmap, 0x20000000, 0x1000, 3, 0x32, -1, 0);
    break;
  case 4:
    NONFAILING(*(uint32_t*)0x20000fe4 = 0x20d44ff2);
    NONFAILING(*(uint32_t*)0x20000fe8 = 0x48);
    NONFAILING(*(uint32_t*)0x20000fec = 0x20000000);
    NONFAILING(*(uint32_t*)0x20000ff0 = 2);
    NONFAILING(*(uint32_t*)0x20000ff4 = 0x20000f84);
    NONFAILING(*(uint32_t*)0x20000ff8 = 0x18);
    NONFAILING(*(uint32_t*)0x20000ffc = 0);
    NONFAILING(*(uint16_t*)0x20d44ff2 = 3);
    NONFAILING(memcpy((void*)0x20d44ff4, "\x19\x58\x19\x87\x53\x7b\xc8", 7));
    NONFAILING(*(uint32_t*)0x20d44ffe = 5);
    NONFAILING(memcpy((void*)0x20d45002, "\xae\x46\x92\xc3\x7d\x0f\xee", 7));
    NONFAILING(memcpy((void*)0x20d45009, "\x1c\x97\xe1\x24\xc4\xed\x2a", 7));
    NONFAILING(memcpy((void*)0x20d45010, "\xd1\xe7\xfe\x27\x6f\x7e\xb6", 7));
    NONFAILING(memcpy((void*)0x20d45017, "\xbb\x66\xfb\xa2\xc6\xef\xfc", 7));
    NONFAILING(memcpy((void*)0x20d4501e, "\xf9\x59\xfe\x56\x6d\x0e\xa9", 7));
    NONFAILING(memcpy((void*)0x20d45025, "\x31\xf3\x45\xc5\xbd\xfe\x20", 7));
    NONFAILING(memcpy((void*)0x20d4502c, "\xf6\x7f\x4b\x7e\x56\x05\x23", 7));
    NONFAILING(memcpy((void*)0x20d45033, "\x58\xb7\x44\x36\x3c\xb3\xa8", 7));
    NONFAILING(*(uint32_t*)0x20000000 = 0x20f6c000);
    NONFAILING(*(uint32_t*)0x20000004 = 0);
    NONFAILING(*(uint32_t*)0x20000008 = 0x20106fcb);
    NONFAILING(*(uint32_t*)0x2000000c = 0);
    NONFAILING(*(uint32_t*)0x20000f84 = 0xc);
    NONFAILING(*(uint32_t*)0x20000f88 = 0x118);
    NONFAILING(*(uint32_t*)0x20000f8c = 8);
    NONFAILING(*(uint32_t*)0x20000f90 = 0xc);
    NONFAILING(*(uint32_t*)0x20000f94 = 0x10d);
    NONFAILING(*(uint32_t*)0x20000f98 = 0x8001);
    syscall(__NR_recvmsg, r[0], 0x20000fe4, 2);
    break;
  case 5:
    syscall(__NR_ioctl, r[0], 0x807c6406, 0x20000fa8);
    break;
  case 6:
    syscall(__NR_mmap, 0x20000000, 0xe76000, 3, 0x32, -1, 0);
    break;
  case 7:
    r[1] = syscall(__NR_socket, 0xa, 2, 0);
    break;
  case 8:
    r[2] = syscall(__NR_socket, 0x18, 1, 1);
    break;
  case 9:
    NONFAILING(*(uint16_t*)0x20e71000 = 0x18);
    NONFAILING(*(uint32_t*)0x20e71002 = 1);
    NONFAILING(*(uint32_t*)0x20e71006 = 0);
    NONFAILING(*(uint32_t*)0x20e7100a = r[1]);
    NONFAILING(*(uint16_t*)0x20e7100e = 3);
    NONFAILING(*(uint16_t*)0x20e71010 = 0);
    NONFAILING(*(uint16_t*)0x20e71012 = 3);
    NONFAILING(*(uint16_t*)0x20e71014 = 0);
    NONFAILING(*(uint16_t*)0x20e71016 = 0xa);
    NONFAILING(*(uint16_t*)0x20e71018 = htobe16(0x4e22));
    NONFAILING(*(uint32_t*)0x20e7101a = 3);
    NONFAILING(*(uint8_t*)0x20e7101e = 0xfe);
    NONFAILING(*(uint8_t*)0x20e7101f = 0x80);
    NONFAILING(*(uint8_t*)0x20e71020 = 0);
    NONFAILING(*(uint8_t*)0x20e71021 = 0);
    NONFAILING(*(uint8_t*)0x20e71022 = 0);
    NONFAILING(*(uint8_t*)0x20e71023 = 0);
    NONFAILING(*(uint8_t*)0x20e71024 = 0);
    NONFAILING(*(uint8_t*)0x20e71025 = 0);
    NONFAILING(*(uint8_t*)0x20e71026 = 0);
    NONFAILING(*(uint8_t*)0x20e71027 = 0);
    NONFAILING(*(uint8_t*)0x20e71028 = 0);
    NONFAILING(*(uint8_t*)0x20e71029 = 0);
    NONFAILING(*(uint8_t*)0x20e7102a = 0);
    NONFAILING(*(uint8_t*)0x20e7102b = 0);
    NONFAILING(*(uint8_t*)0x20e7102c = 0);
    NONFAILING(*(uint8_t*)0x20e7102d = 0xbb);
    NONFAILING(*(uint32_t*)0x20e7102e = 4);
    syscall(__NR_connect, r[2], 0x20e71000, 0x32);
    break;
  case 10:
    r[3] = syscall(__NR_socket, 0x18, 1, 1);
    break;
  case 11:
    syscall(__NR_close, r[1]);
    break;
  case 12:
    syscall(__NR_dup2, r[3], r[2]);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(13);
  collide = 1;
  execute(13);
}

int main()
{
  install_segv_handler();
  char* cwd = get_current_dir_name();
  for (;;) {
    if (chdir(cwd))
      fail("failed to chdir");
    use_temporary_dir();
    int pid = do_sandbox_none(0, false);
    int status = 0;
    while (waitpid(pid, &status, __WALL) != pid) {
    }
  }
}