// https://syzkaller.appspot.com/bug?id=d369eafab7836fe0dd2e027d2689da06cad8e1a3
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.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 <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  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);
}

__attribute__((noreturn)) static void exitf(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

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);
}

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);
}

#define COMMAND_MAX_LEN 128

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

  va_start(args, format);

  vsnprintf_check(command, sizeof(command), format, args);
  rv = system(command);
  if (rv != 0)
    fail("tun: command \"%s\" failed with code %d", &command[0], rv);

  va_end(args);
}

static int tunfd = -1;

#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define MAX_PIDS 32
#define ADDR_MAX_LEN 32

#define LOCAL_MAC "aa:aa:aa:aa:aa:%02hx"
#define REMOTE_MAC "bb:bb:bb:bb:bb:%02hx"

#define LOCAL_IPV4 "172.20.%d.170"
#define REMOTE_IPV4 "172.20.%d.187"

#define LOCAL_IPV6 "fe80::%02hxaa"
#define REMOTE_IPV6 "fe80::%02hxbb"

static void initialize_tun(uint64_t pid)
{
  if (pid >= MAX_PIDS)
    fail("tun: no more than %d executors", MAX_PIDS);
  int id = pid;

  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1)
    fail("tun: can't open /dev/net/tun");

  char iface[IFNAMSIZ];
  snprintf_check(iface, sizeof(iface), "syz%d", id);

  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, iface, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
    fail("tun: ioctl(TUNSETIFF) failed");

  char local_mac[ADDR_MAX_LEN];
  snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id);
  char remote_mac[ADDR_MAX_LEN];
  snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id);

  char local_ipv4[ADDR_MAX_LEN];
  snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id);
  char remote_ipv4[ADDR_MAX_LEN];
  snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id);

  char local_ipv6[ADDR_MAX_LEN];
  snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id);
  char remote_ipv6[ADDR_MAX_LEN];
  snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id);

  execute_command("sysctl -w net.ipv6.conf.%s.accept_dad=0", iface);

  execute_command("sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  iface);

  execute_command("ip link set dev %s address %s", iface, local_mac);
  execute_command("ip addr add %s/24 dev %s", local_ipv4, iface);
  execute_command("ip -6 addr add %s/120 dev %s", local_ipv6, iface);
  execute_command("ip neigh add %s lladdr %s dev %s nud permanent",
                  remote_ipv4, remote_mac, iface);
  execute_command("ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  remote_ipv6, remote_mac, iface);
  execute_command("ip link set dev %s up", iface);
}

static void setup_tun(uint64_t pid, bool enable_tun)
{
  if (enable_tun)
    initialize_tun(pid);
}

static int read_tun(char* data, int size)
{
  int rv = read(tunfd, data, size);
  if (rv < 0) {
    if (errno == EAGAIN)
      return -1;
    fail("tun: read failed with %d, errno: %d", rv, errno);
  }
  return rv;
}

static void flush_tun()
{
  char data[SYZ_TUN_MAX_PACKET_SIZE];
  while (read_tun(&data[0], sizeof(data)) != -1)
    ;
}

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      flush_tun();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
  }
}

long r[149];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    *(uint32_t*)0x2002ef88 = (uint32_t)0x2;
    *(uint32_t*)0x2002ef8c = (uint32_t)0x78;
    *(uint8_t*)0x2002ef90 = (uint8_t)0x0;
    *(uint8_t*)0x2002ef91 = (uint8_t)0x3;
    *(uint8_t*)0x2002ef92 = (uint8_t)0x0;
    *(uint8_t*)0x2002ef93 = (uint8_t)0x0;
    *(uint32_t*)0x2002ef94 = (uint32_t)0x0;
    *(uint64_t*)0x2002ef98 = (uint64_t)0x0;
    *(uint64_t*)0x2002efa0 = (uint64_t)0x0;
    *(uint64_t*)0x2002efa8 = (uint64_t)0x0;
    *(uint8_t*)0x2002efb0 = (uint8_t)0x0;
    *(uint8_t*)0x2002efb1 = (uint8_t)0x0;
    *(uint8_t*)0x2002efb2 = (uint8_t)0x0;
    *(uint8_t*)0x2002efb3 = (uint8_t)0x0;
    *(uint32_t*)0x2002efb4 = (uint32_t)0x0;
    *(uint32_t*)0x2002efb8 = (uint32_t)0x0;
    *(uint32_t*)0x2002efbc = (uint32_t)0x0;
    *(uint64_t*)0x2002efc0 = (uint64_t)0x0;
    *(uint64_t*)0x2002efc8 = (uint64_t)0x0;
    *(uint64_t*)0x2002efd0 = (uint64_t)0x0;
    *(uint64_t*)0x2002efd8 = (uint64_t)0x0;
    *(uint64_t*)0x2002efe0 = (uint64_t)0x0;
    *(uint32_t*)0x2002efe8 = (uint32_t)0x0;
    *(uint64_t*)0x2002eff0 = (uint64_t)0x0;
    *(uint32_t*)0x2002eff8 = (uint32_t)0x0;
    *(uint16_t*)0x2002effc = (uint16_t)0x0;
    *(uint16_t*)0x2002effe = (uint16_t)0x0;
    r[28] = syscall(__NR_perf_event_open, 0x2002ef88ul, 0x0ul, 0x0ul,
                    0xfffffffffffffffful, 0x0ul);
    break;
  case 2:
    *(uint32_t*)0x2001d000 = (uint32_t)0x2;
    *(uint32_t*)0x2001d004 = (uint32_t)0x78;
    *(uint8_t*)0x2001d008 = (uint8_t)0xdb;
    *(uint8_t*)0x2001d009 = (uint8_t)0x0;
    *(uint8_t*)0x2001d00a = (uint8_t)0x0;
    *(uint8_t*)0x2001d00b = (uint8_t)0x0;
    *(uint32_t*)0x2001d00c = (uint32_t)0x0;
    *(uint64_t*)0x2001d010 = (uint64_t)0x0;
    *(uint64_t*)0x2001d018 = (uint64_t)0x0;
    *(uint64_t*)0x2001d020 = (uint64_t)0x0;
    *(uint8_t*)0x2001d028 = (uint8_t)0xfe;
    *(uint8_t*)0x2001d029 = (uint8_t)0x0;
    *(uint8_t*)0x2001d02a = (uint8_t)0x0;
    *(uint8_t*)0x2001d02b = (uint8_t)0x0;
    *(uint32_t*)0x2001d02c = (uint32_t)0x0;
    *(uint32_t*)0x2001d030 = (uint32_t)0x0;
    *(uint32_t*)0x2001d034 = (uint32_t)0x0;
    *(uint64_t*)0x2001d038 = (uint64_t)0x0;
    *(uint64_t*)0x2001d040 = (uint64_t)0x0;
    *(uint64_t*)0x2001d048 = (uint64_t)0x0;
    *(uint64_t*)0x2001d050 = (uint64_t)0x0;
    *(uint64_t*)0x2001d058 = (uint64_t)0x0;
    *(uint32_t*)0x2001d060 = (uint32_t)0x0;
    *(uint64_t*)0x2001d068 = (uint64_t)0x0;
    *(uint32_t*)0x2001d070 = (uint32_t)0x0;
    *(uint16_t*)0x2001d074 = (uint16_t)0x0;
    *(uint16_t*)0x2001d076 = (uint16_t)0x0;
    r[56] = syscall(__NR_perf_event_open, 0x2001d000ul, 0x0ul,
                    0xfffffffffffffffful, 0xfffffffffffffffful, 0x0ul);
    break;
  case 3:
    memcpy((void*)0x20217ff6,
           "\x73\x79\x7a\x6b\x61\x6c\x6c\x65\x3f\x00", 10);
    *(uint8_t*)0x20cc5000 = (uint8_t)0x73;
    *(uint8_t*)0x20cc5001 = (uint8_t)0x79;
    *(uint8_t*)0x20cc5002 = (uint8_t)0x7a;
    *(uint8_t*)0x20cc5003 = (uint8_t)0x20;
    *(uint8_t*)0x20cc5004 = (uint8_t)0x0;
    memcpy((void*)0x2039dff3,
           "\x25\x2a\x25\x2d\x76\x62\x6f\x78\x6e\x65\x74\x30\x00", 13);
    r[64] = syscall(__NR_request_key, 0x20217ff6ul, 0x20cc5000ul,
                    0x2039dff3ul, 0xffffff7ffffffffdul);
    break;
  case 4:
    memcpy((void*)0x20b8cff8, "\x62\x69\x67\x5f\x6b\x65\x79\x00", 8);
    *(uint8_t*)0x206a9000 = (uint8_t)0x73;
    *(uint8_t*)0x206a9001 = (uint8_t)0x79;
    *(uint8_t*)0x206a9002 = (uint8_t)0x7a;
    *(uint8_t*)0x206a9003 = (uint8_t)0x22;
    *(uint8_t*)0x206a9004 = (uint8_t)0x0;
    r[71] = syscall(__NR_add_key, 0x20b8cff8ul, 0x206a9000ul,
                    0x20000000ul, 0x0ul, 0xfffffffffffffffful);
    break;
  case 5:
    *(uint8_t*)0x2096a000 = (uint8_t)0x0;
    *(uint8_t*)0x2096a001 = (uint8_t)0x0;
    *(uint32_t*)0x2096a004 = (uint32_t)0x2;
    *(uint32_t*)0x2096a008 = (uint32_t)0x0;
    *(uint32_t*)0x2096a00c = (uint32_t)0x4000000000000000;
    *(uint8_t*)0x2096a010 = (uint8_t)0x0;
    *(uint8_t*)0x2096a011 = (uint8_t)0x0;
    *(uint8_t*)0x2096a012 = (uint8_t)0x0;
    *(uint32_t*)0x2096a014 = (uint32_t)0x0;
    *(uint8_t*)0x2096a018 = (uint8_t)0x0;
    *(uint8_t*)0x2096a019 = (uint8_t)0x0;
    *(uint8_t*)0x2096a01a = (uint8_t)0x0;
    *(uint8_t*)0x2096a01b = (uint8_t)0x0;
    *(uint8_t*)0x2096a01c = (uint8_t)0x0;
    *(uint8_t*)0x2096a01d = (uint8_t)0x0;
    *(uint8_t*)0x2096a01e = (uint8_t)0x0;
    *(uint8_t*)0x2096a01f = (uint8_t)0x0;
    *(uint8_t*)0x2096a020 = (uint8_t)0x0;
    *(uint8_t*)0x2096a021 = (uint8_t)0x0;
    *(uint8_t*)0x2096a022 = (uint8_t)0x0;
    *(uint8_t*)0x2096a023 = (uint8_t)0x0;
    *(uint8_t*)0x2096a024 = (uint8_t)0x0;
    *(uint8_t*)0x2096a025 = (uint8_t)0x0;
    *(uint8_t*)0x2096a026 = (uint8_t)0x0;
    *(uint8_t*)0x2096a027 = (uint8_t)0x0;
    *(uint8_t*)0x2096a028 = (uint8_t)0x0;
    *(uint8_t*)0x2096a029 = (uint8_t)0x0;
    *(uint8_t*)0x2096a02a = (uint8_t)0x0;
    *(uint8_t*)0x2096a02b = (uint8_t)0x0;
    *(uint8_t*)0x2096a02c = (uint8_t)0x0;
    *(uint8_t*)0x2096a02d = (uint8_t)0x0;
    *(uint8_t*)0x2096a02e = (uint8_t)0x0;
    *(uint8_t*)0x2096a02f = (uint8_t)0x0;
    *(uint8_t*)0x2096a030 = (uint8_t)0x0;
    *(uint8_t*)0x2096a031 = (uint8_t)0x0;
    *(uint8_t*)0x2096a032 = (uint8_t)0x0;
    *(uint8_t*)0x2096a033 = (uint8_t)0x0;
    *(uint8_t*)0x2096a034 = (uint8_t)0x0;
    *(uint8_t*)0x2096a035 = (uint8_t)0x0;
    *(uint8_t*)0x2096a036 = (uint8_t)0x0;
    *(uint8_t*)0x2096a037 = (uint8_t)0x0;
    *(uint8_t*)0x2096a038 = (uint8_t)0x0;
    *(uint8_t*)0x2096a039 = (uint8_t)0x0;
    *(uint8_t*)0x2096a03a = (uint8_t)0x0;
    *(uint8_t*)0x2096a03b = (uint8_t)0x0;
    *(uint8_t*)0x2096a03c = (uint8_t)0x0;
    *(uint8_t*)0x2096a03d = (uint8_t)0x0;
    *(uint8_t*)0x2096a03e = (uint8_t)0x0;
    *(uint8_t*)0x2096a03f = (uint8_t)0x0;
    *(uint8_t*)0x2096a040 = (uint8_t)0x0;
    *(uint8_t*)0x2096a041 = (uint8_t)0x0;
    *(uint8_t*)0x2096a042 = (uint8_t)0x0;
    *(uint8_t*)0x2096a043 = (uint8_t)0x0;
    *(uint8_t*)0x2096a044 = (uint8_t)0x0;
    *(uint8_t*)0x2096a045 = (uint8_t)0x0;
    *(uint8_t*)0x2096a046 = (uint8_t)0x0;
    *(uint8_t*)0x2096a047 = (uint8_t)0x0;
    *(uint8_t*)0x2096a048 = (uint8_t)0x0;
    *(uint8_t*)0x2096a049 = (uint8_t)0x0;
    *(uint8_t*)0x2096a04a = (uint8_t)0x0;
    *(uint8_t*)0x2096a04b = (uint8_t)0x0;
    *(uint8_t*)0x2096a04c = (uint8_t)0x0;
    *(uint8_t*)0x2096a04d = (uint8_t)0x0;
    *(uint8_t*)0x2096a04e = (uint8_t)0x0;
    *(uint8_t*)0x2096a04f = (uint8_t)0x0;
    *(uint8_t*)0x2096a050 = (uint8_t)0x0;
    *(uint8_t*)0x2096a051 = (uint8_t)0x0;
    *(uint8_t*)0x2096a052 = (uint8_t)0x0;
    *(uint8_t*)0x2096a053 = (uint8_t)0x0;
    *(uint8_t*)0x2096a054 = (uint8_t)0x0;
    *(uint8_t*)0x2096a055 = (uint8_t)0x0;
    *(uint8_t*)0x2096a056 = (uint8_t)0x0;
    *(uint8_t*)0x2096a057 = (uint8_t)0x0;
    r[145] = syscall(__NR_ioctl, 0xfffffffffffffffful, 0xc058534ful,
                     0x2096a000ul);
    break;
  case 6:
    memcpy((void*)0x20af8ff7, "\x2f\x64\x65\x76\x2f\x6b\x76\x6d\x00",
           9);
    r[147] = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20af8ff7ul,
                     0x0ul, 0x0ul);
    break;
  case 7:
    r[148] = syscall(__NR_ioctl, r[147], 0xae01ul, 0x0ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[16];

  memset(r, -1, sizeof(r));
  for (i = 0; i < 8; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      setup_tun(i, true);
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}