// https://syzkaller.appspot.com/bug?id=300efd16d2de5c36edf506d1c07b6cdd94482229
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.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 <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.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);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 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)) {
  }
}

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)) {
  }

  loop();
  doexit(1);
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void loop()
{
  long res = 0;
  res = syscall(__NR_socket, 0x8000000000000011, 0x100000802, 0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000080, "/dev/net/tun", 13);
  res = syz_open_dev(0x20000080, 0, 2);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000040,
         "\x69\x66\x62\x30\x00\xfa\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00",
         16);
  *(uint16_t*)0x20000050 = 0x4001;
  syscall(__NR_ioctl, r[1], 0x400454ca, 0x20000040);
  memcpy((void*)0x200000c0,
         "\x69\x66\x62\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         16);
  *(uint16_t*)0x200000d0 = 0xa201;
  syscall(__NR_ioctl, r[0], 0x8914, 0x200000c0);
  *(uint16_t*)0x20000600 = 0;
  *(uint16_t*)0x20000602 = htobe16(0x8864);
  *(uint8_t*)0x20000604 = 3;
  *(uint8_t*)0x20000605 = 0;
  *(uint16_t*)0x20000606 = 0;
  *(uint16_t*)0x20000608 = 0;
  *(uint16_t*)0x2000060a = 0;
  *(uint16_t*)0x2000060c = 0;
  *(uint8_t*)0x2000060e = 0xaa;
  *(uint8_t*)0x2000060f = 0xaa;
  *(uint8_t*)0x20000610 = 0xaa;
  *(uint8_t*)0x20000611 = 0xaa;
  *(uint8_t*)0x20000612 = 0xaa;
  *(uint8_t*)0x20000613 = 0xaa;
  *(uint8_t*)0x20000614 = 0xaa;
  *(uint8_t*)0x20000615 = 0xaa;
  *(uint8_t*)0x20000616 = 0xaa;
  *(uint8_t*)0x20000617 = 0xaa;
  *(uint8_t*)0x20000618 = 0xaa;
  *(uint8_t*)0x20000619 = 0;
  *(uint16_t*)0x2000061a = htobe16(0x8847);
  STORE_BY_BITMASK(uint8_t, 0x2000061c, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000061c, 6, 4, 4);
  memcpy((void*)0x2000061d, "\x30\xaf\xc2", 3);
  *(uint16_t*)0x20000620 = htobe16(0x10);
  *(uint8_t*)0x20000622 = 0;
  *(uint8_t*)0x20000623 = 0;
  *(uint8_t*)0x20000624 = -1;
  *(uint8_t*)0x20000625 = 1;
  *(uint8_t*)0x20000626 = 0;
  *(uint8_t*)0x20000627 = 0;
  *(uint8_t*)0x20000628 = 0;
  *(uint8_t*)0x20000629 = 0;
  *(uint8_t*)0x2000062a = 0;
  *(uint8_t*)0x2000062b = 0;
  *(uint8_t*)0x2000062c = 0;
  *(uint8_t*)0x2000062d = 0;
  *(uint8_t*)0x2000062e = 0;
  *(uint8_t*)0x2000062f = 0;
  *(uint8_t*)0x20000630 = 0;
  *(uint8_t*)0x20000631 = 0;
  *(uint8_t*)0x20000632 = 0;
  *(uint8_t*)0x20000633 = 1;
  *(uint8_t*)0x20000634 = 0xfe;
  *(uint8_t*)0x20000635 = 0x80;
  *(uint8_t*)0x20000636 = 0;
  *(uint8_t*)0x20000637 = 0;
  *(uint8_t*)0x20000638 = 0;
  *(uint8_t*)0x20000639 = 0;
  *(uint8_t*)0x2000063a = 0;
  *(uint8_t*)0x2000063b = 0;
  *(uint8_t*)0x2000063c = 0;
  *(uint8_t*)0x2000063d = 0;
  *(uint8_t*)0x2000063e = 0;
  *(uint8_t*)0x2000063f = 0;
  *(uint8_t*)0x20000640 = 0;
  *(uint8_t*)0x20000641 = 0;
  *(uint8_t*)0x20000642 = 0;
  *(uint8_t*)0x20000643 = 0;
  *(uint16_t*)0x20000644 = htobe16(0);
  *(uint16_t*)0x20000646 = htobe16(0);
  *(uint8_t*)0x20000648 = 4;
  STORE_BY_BITMASK(uint8_t, 0x20000649, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20000649, 0, 4, 4);
  *(uint16_t*)0x2000064a = 0;
  STORE_BY_BITMASK(uint8_t, 0x2000064c, 0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x2000064c, 0, 1, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000064c, 0, 5, 3);
  memcpy((void*)0x2000064d, "\x5f\xf0\x25", 3);
  *(uint8_t*)0x20000650 = 0;
  memcpy((void*)0x20000651, "\xd1\xe7\x5f", 3);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000624, 16);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000634, 16);
  uint32_t csum_1_chunk_2 = 0x10000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
  uint32_t csum_1_chunk_3 = 0x21000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000644, 16);
  *(uint16_t*)0x2000064a = csum_inet_digest(&csum_1);
  syscall(__NR_write, r[1], 0x20000600, 0xfd87);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  int pid = do_sandbox_none();
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}