// https://syzkaller.appspot.com/bug?id=6dcd14a729df98f989c7b76d254226ae67084efd
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

#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);
  }
}

uint64_t r[1] = {0xffffffffffffffff};
void loop()
{
  long res;
  memcpy((void*)0x2063dff7, "/dev/sg#", 9);
  res = syz_open_dev(0x2063dff7, 0, 2);
  if (res != -1)
    r[0] = res;
  *(uint8_t*)0x20a2f000 = 0;
  *(uint8_t*)0x20a2f001 = 0;
  *(uint16_t*)0x20a2f002 = 0;
  *(uint16_t*)0x20a2f004 = 0;
  *(uint16_t*)0x20a2f006 = 0;
  *(uint16_t*)0x20a2f008 = 0;
  STORE_BY_BITMASK(uint8_t, 0x20a2f00a, 7, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20a2f00a, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x20a2f00b, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x20a2f00b, 0, 2, 6);
  *(uint16_t*)0x20a2f00c = htobe16(0x30);
  *(uint16_t*)0x20a2f00e = htobe16(0);
  *(uint16_t*)0x20a2f010 = htobe16(0);
  *(uint8_t*)0x20a2f012 = 0;
  *(uint8_t*)0x20a2f013 = 0;
  *(uint16_t*)0x20a2f014 = 0;
  *(uint32_t*)0x20a2f016 = htobe32(0xe0000002);
  *(uint32_t*)0x20a2f01a = htobe32(0xe0000001);
  *(uint8_t*)0x20a2f01e = 1;
  *(uint8_t*)0x20a2f01f = 0x86;
  *(uint8_t*)0x20a2f020 = 6;
  *(uint32_t*)0x20a2f021 = htobe32(8);
  *(uint16_t*)0x20a2f026 = htobe16(0x4e20);
  *(uint16_t*)0x20a2f028 = htobe16(0x4e20);
  *(uint32_t*)0x20a2f02a = 0x42424242;
  *(uint32_t*)0x20a2f02e = 0x42424242;
  STORE_BY_BITMASK(uint8_t, 0x20a2f032, 0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x20a2f032, 0, 1, 3);
  STORE_BY_BITMASK(uint8_t, 0x20a2f032, 5, 4, 4);
  *(uint8_t*)0x20a2f033 = 0;
  *(uint16_t*)0x20a2f034 = htobe16(0);
  *(uint16_t*)0x20a2f036 = 0;
  *(uint16_t*)0x20a2f038 = htobe16(0);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20a2f016, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x20a2f01a, 4);
  uint16_t csum_1_chunk_2 = 0x600;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x1400;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x20a2f026, 20);
  *(uint16_t*)0x20a2f036 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x20a2f00a, 28);
  *(uint16_t*)0x20a2f014 = csum_inet_digest(&csum_2);
  syscall(__NR_write, r[0], 0x20a2f000, 0x3a);
  syscall(__NR_read, r[0], 0x20000080, 0x111);
}

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