// https://syzkaller.appspot.com/bug?id=af3a0728c8cbf6903ec2b0836441287cced00c1c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/uio.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 <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.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 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 vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;

  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    fail("tun: snprintf failed");
  if ((size_t)rv >= size)
    fail("tun: string '%s...' doesn't fit into buffer", str);
}

#define COMMAND_MAX_LEN 128
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

static void execute_command(bool panic, const char* format, ...)
{
  va_list args;
  char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
  int rv;

  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  va_end(args);
  rv = system(command);
  if (rv) {
    if (panic)
      fail("command '%s' failed: %d", &command[0], rv);
  }
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

static void snprintf_check(char* str, size_t size, const char* format, ...)
{
  va_list args;

  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}

static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"};
  const char* devnames[] = {"lo",
                            "sit0",
                            "bridge0",
                            "vcan0",
                            "tunl0",
                            "gre0",
                            "gretap0",
                            "ip_vti0",
                            "ip6_vti0",
                            "ip6tnl0",
                            "ip6gre0",
                            "ip6gretap0",
                            "erspan0",
                            "bond0",
                            "veth0",
                            "veth1",
                            "team0",
                            "veth0_to_bridge",
                            "veth1_to_bridge",
                            "veth0_to_bond",
                            "veth1_to_bond",
                            "veth0_to_team",
                            "veth1_to_team"};
  const char* devmasters[] = {"bridge", "bond", "team"};

  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  execute_command(0, "ip link add type veth");

  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    execute_command(
        0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(
        0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set veth0_to_%s up", devmasters[i]);
    execute_command(0, "ip link set veth1_to_%s up", devmasters[i]);
  }
  execute_command(0, "ip link set bridge_slave_0 up");
  execute_command(0, "ip link set bridge_slave_1 up");

  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[32];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

static uintptr_t syz_open_pts(uintptr_t a0, uintptr_t a1)
{
  int ptyno = 0;
  if (ioctl(a0, TIOCGPTN, &ptyno))
    return -1;
  char buf[128];
  sprintf(buf, "/dev/pts/%d", ptyno);
  return open(buf, a1, 0);
}

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 = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 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);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    fail("sandbox fork failed");
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_netdevices();
  loop();
  doexit(1);
}

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[8] = {0xffffffffffffffff,
                 0xffffffffffffffff,
                 0x0,
                 0x0,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0x10, 3, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    res = syscall(__NR_dup2, r[0], r[0]);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    *(uint32_t*)0x20000080 = 0x10;
    syscall(__NR_getpeername, r[1], 0x20000040, 0x20000080);
    break;
  case 3:
    memcpy((void*)0x20000000,
           "\x62\x70\x71\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           16);
    *(uint32_t*)0x20000010 = 0;
    res = syscall(__NR_ioctl, r[1], 0x8933, 0x20000000);
    if (res != -1)
      r[2] = *(uint32_t*)0x20000010;
    break;
  case 4:
    res = syscall(__NR_getresuid, 0x200000c0, 0x20000100, 0x20000140);
    if (res != -1)
      r[3] = *(uint32_t*)0x200000c0;
    break;
  case 5:
    *(uint8_t*)0x20000180 = -1;
    *(uint8_t*)0x20000181 = 1;
    *(uint8_t*)0x20000182 = 0;
    *(uint8_t*)0x20000183 = 0;
    *(uint8_t*)0x20000184 = 0;
    *(uint8_t*)0x20000185 = 0;
    *(uint8_t*)0x20000186 = 0;
    *(uint8_t*)0x20000187 = 0;
    *(uint8_t*)0x20000188 = 0;
    *(uint8_t*)0x20000189 = 0;
    *(uint8_t*)0x2000018a = 0;
    *(uint8_t*)0x2000018b = 0;
    *(uint8_t*)0x2000018c = 0;
    *(uint8_t*)0x2000018d = 0;
    *(uint8_t*)0x2000018e = 0;
    *(uint8_t*)0x2000018f = 1;
    *(uint8_t*)0x20000190 = 0xfe;
    *(uint8_t*)0x20000191 = 0x80;
    *(uint8_t*)0x20000192 = 0;
    *(uint8_t*)0x20000193 = 0;
    *(uint8_t*)0x20000194 = 0;
    *(uint8_t*)0x20000195 = 0;
    *(uint8_t*)0x20000196 = 0;
    *(uint8_t*)0x20000197 = 0;
    *(uint8_t*)0x20000198 = 0;
    *(uint8_t*)0x20000199 = 0;
    *(uint8_t*)0x2000019a = 0;
    *(uint8_t*)0x2000019b = 0;
    *(uint8_t*)0x2000019c = 0;
    *(uint8_t*)0x2000019d = 0;
    *(uint8_t*)0x2000019e = 0;
    *(uint8_t*)0x2000019f = 0xaa;
    *(uint16_t*)0x200001a0 = htobe16(0x4e23);
    *(uint16_t*)0x200001a2 = htobe16(0);
    *(uint16_t*)0x200001a4 = htobe16(0x4e22);
    *(uint16_t*)0x200001a6 = htobe16(5);
    *(uint16_t*)0x200001a8 = 0xa;
    *(uint8_t*)0x200001aa = 0xa0;
    *(uint8_t*)0x200001ab = 0x80;
    *(uint8_t*)0x200001ac = 0;
    *(uint32_t*)0x200001b0 = r[2];
    *(uint32_t*)0x200001b4 = r[3];
    *(uint64_t*)0x200001b8 = 5;
    *(uint64_t*)0x200001c0 = 1;
    *(uint64_t*)0x200001c8 = 0x2000000000000000;
    *(uint64_t*)0x200001d0 = 0xe6;
    *(uint64_t*)0x200001d8 = 1;
    *(uint64_t*)0x200001e0 = 0x7f;
    *(uint64_t*)0x200001e8 = 5;
    *(uint64_t*)0x200001f0 = 0x80;
    *(uint64_t*)0x200001f8 = 0;
    *(uint64_t*)0x20000200 = 1;
    *(uint64_t*)0x20000208 = 0x18e;
    *(uint64_t*)0x20000210 = 0xfffffffffffffffb;
    *(uint32_t*)0x20000218 = 0x400;
    *(uint32_t*)0x2000021c = 0x6e6bb0;
    *(uint8_t*)0x20000220 = 3;
    *(uint8_t*)0x20000221 = 1;
    *(uint8_t*)0x20000222 = 0;
    *(uint8_t*)0x20000223 = 3;
    *(uint8_t*)0x20000228 = 0;
    *(uint8_t*)0x20000229 = 0;
    *(uint8_t*)0x2000022a = 0;
    *(uint8_t*)0x2000022b = 0;
    *(uint8_t*)0x2000022c = 0;
    *(uint8_t*)0x2000022d = 0;
    *(uint8_t*)0x2000022e = 0;
    *(uint8_t*)0x2000022f = 0;
    *(uint8_t*)0x20000230 = 0;
    *(uint8_t*)0x20000231 = 0;
    *(uint8_t*)0x20000232 = 0;
    *(uint8_t*)0x20000233 = 0;
    *(uint8_t*)0x20000234 = 0;
    *(uint8_t*)0x20000235 = 0;
    *(uint8_t*)0x20000236 = 0;
    *(uint8_t*)0x20000237 = 0;
    *(uint32_t*)0x20000238 = htobe32(0x4d2);
    *(uint8_t*)0x2000023c = 0x32;
    *(uint16_t*)0x20000240 = 2;
    *(uint32_t*)0x20000244 = htobe32(0);
    *(uint32_t*)0x20000254 = 0x3506;
    *(uint8_t*)0x20000258 = 1;
    *(uint8_t*)0x20000259 = 0;
    *(uint8_t*)0x2000025a = 2;
    *(uint32_t*)0x2000025c = 0x960;
    *(uint32_t*)0x20000260 = 4;
    *(uint32_t*)0x20000264 = 7;
    syscall(__NR_setsockopt, r[1], 0x29, 0x23, 0x20000180, 0xe8);
    break;
  case 6:
    memcpy((void*)0x20000040, "/dev/ptmx", 10);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0);
    if (res != -1)
      r[4] = res;
    break;
  case 7:
    syscall(__NR_ioctl, r[4], 0x5422);
    break;
  case 8:
    *(uint64_t*)0x20000000 = 0x3f;
    syscall(__NR_ioctl, r[4], 0x4b63, 0x20000000);
    break;
  case 9:
    res = syscall(__NR_socket, 0x10, 3, 0);
    if (res != -1)
      r[5] = res;
    break;
  case 10:
    syscall(__NR_listen, r[5], 0x7ff);
    break;
  case 11:
    res = syscall(__NR_dup2, r[5], r[5]);
    if (res != -1)
      r[6] = res;
    break;
  case 12:
    *(uint32_t*)0x20000300 = 0xf7;
    syscall(__NR_getsockopt, r[6], 0x10e, 0, 0x200062c0, 0x20000300);
    break;
  case 13:
    memcpy((void*)0x20000080, "/dev/ptmx", 10);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000080, 0, 0);
    if (res != -1)
      r[7] = res;
    break;
  case 14:
    syscall(__NR_read, r[7], 0x200000c0, 0xe1);
    break;
  case 15:
    syz_open_pts(r[7], 0);
    break;
  }
}

void loop()
{
  execute(16);
  collide = 1;
  execute(16);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  use_temporary_dir();
  do_sandbox_none();
  return 0;
}