// https://syzkaller.appspot.com/bug?id=5735d842f7ea3ed9220aca64952ac4aba7ba741c
// 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 <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 <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <sys/resource.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 <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 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 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)) {
  }
}

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

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

static void execute_one();
extern unsigned long long procid;

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

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
unsigned long long procid;
void execute_one()
{
  long res = 0;
  NONFAILING(*(uint64_t*)0x20000780 = 0x20000200);
  NONFAILING(*(uint16_t*)0x20000200 = 0x10);
  NONFAILING(*(uint16_t*)0x20000202 = 0);
  NONFAILING(*(uint32_t*)0x20000204 = 0);
  NONFAILING(*(uint32_t*)0x20000208 = 0);
  NONFAILING(*(uint32_t*)0x20000788 = 0xc);
  NONFAILING(*(uint64_t*)0x20000790 = 0x20000480);
  NONFAILING(*(uint64_t*)0x20000798 = 0);
  NONFAILING(*(uint64_t*)0x200007a0 = 0x20000740);
  NONFAILING(*(uint32_t*)0x20000740 = -1);
  NONFAILING(memcpy((void*)0x20000744, "\x00\x00\x02\x00\x18\x00\x00\x00\x00"
                                       "\x00\x00\x00\x01\x00\x00\x00\x01\x00"
                                       "\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000758 = -1);
  NONFAILING(*(uint32_t*)0x2000075c = -1);
  NONFAILING(*(uint64_t*)0x200007a8 = 0x20);
  NONFAILING(*(uint32_t*)0x200007b0 = 0x10);
  syscall(__NR_sendmsg, -1, 0x20000780, 0x8000);
  res = syscall(__NR_socket, 0xa, 0x40000080806, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint16_t*)0x2047b000 = 0xa);
  NONFAILING(*(uint16_t*)0x2047b002 = htobe16(0x4e20));
  NONFAILING(*(uint32_t*)0x2047b004 = 0);
  NONFAILING(*(uint64_t*)0x2047b008 = htobe64(0));
  NONFAILING(*(uint64_t*)0x2047b010 = htobe64(1));
  NONFAILING(*(uint32_t*)0x2047b018 = 0);
  syscall(__NR_bind, r[0], 0x2047b000, 0x1c);
  syscall(__NR_listen, r[0], 1);
  res = syscall(__NR_socket, 0xa, 0x80006, 0);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint16_t*)0x20000280 = 0xa);
  NONFAILING(*(uint16_t*)0x20000282 = htobe16(0x4e20));
  NONFAILING(*(uint32_t*)0x20000284 = 0);
  NONFAILING(*(uint64_t*)0x20000288 = htobe64(0));
  NONFAILING(*(uint64_t*)0x20000290 = htobe64(1));
  NONFAILING(*(uint32_t*)0x20000298 = 0);
  syscall(__NR_connect, r[1], 0x20000280, 0x1c);
  NONFAILING(*(uint32_t*)0x20000040 = 0x1c);
  res = syscall(__NR_accept4, r[0], 0x20000000, 0x20000040, 0);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint64_t*)0x20001340 = 0x200000c0);
  NONFAILING(*(uint32_t*)0x20001348 = 0);
  NONFAILING(*(uint64_t*)0x20001350 = 0x20000140);
  NONFAILING(*(uint64_t*)0x20001358 = 0);
  NONFAILING(*(uint64_t*)0x20001360 = 0x200013c0);
  NONFAILING(*(uint64_t*)0x20001368 = 0);
  NONFAILING(*(uint32_t*)0x20001370 = 0);
  syscall(__NR_sendmsg, r[2], 0x20001340, 0);
  NONFAILING(*(uint64_t*)0x20000680 = 0x20000180);
  NONFAILING(*(uint16_t*)0x20000180 = 0x27);
  NONFAILING(*(uint32_t*)0x20000184 = 0);
  NONFAILING(*(uint32_t*)0x20000188 = 0);
  NONFAILING(*(uint32_t*)0x2000018c = 0);
  NONFAILING(*(uint32_t*)0x20000688 = 0x80);
  NONFAILING(*(uint64_t*)0x20000690 = 0x20000500);
  NONFAILING(*(uint64_t*)0x20000698 = 0);
  NONFAILING(*(uint64_t*)0x200006a0 = 0x20001480);
  NONFAILING(*(uint64_t*)0x200006a8 = 0);
  NONFAILING(*(uint32_t*)0x200006b0 = 0);
  syscall(__NR_sendmsg, r[2], 0x20000680, 0);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        if (chdir(cwd))
          fail("failed to chdir");
        use_temporary_dir();
        int pid = do_sandbox_none();
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}