syzkaller-repros/linux/e56e6e7d53c843019fd5c93c9550579105dac0c7.c

// lost connection to test machine (2)
// https://syzkaller.appspot.com/bug?id=e56e6e7d53c843019fd5c93c9550579105dac0c7
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <sys/syscall.h>
#include <unistd.h>

#include <stdint.h>
#include <string.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 void test();

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

#ifndef __NR_setsockopt
#define __NR_setsockopt 366
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[1];
uint64_t procid;
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 0x3, 0x32, 0xffffffff, 0x0);
  r[0] = syscall(__NR_socket, 0xa, 0x80001, 0x0);
  memcpy((void*)0x20000000, "\xef\xad\x07\x00\x00\xa7", 6);
  *(uint8_t*)0x20000006 = 0x0;
  *(uint8_t*)0x20000007 = 0x0;
  *(uint8_t*)0x20000008 = 0x0;
  *(uint8_t*)0x20000009 = 0x0;
  *(uint8_t*)0x2000000a = 0x0;
  *(uint8_t*)0x2000000b = 0x0;
  *(uint16_t*)0x2000000c = htobe16(0x0);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 0x5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 0x4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000f, 0x0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2000000f, 0x0, 2, 6);
  *(uint16_t*)0x20000010 = htobe16(0x48);
  *(uint16_t*)0x20000012 = htobe16(0x64 + procid * 0x4ul);
  *(uint16_t*)0x20000014 = htobe16(0x0);
  *(uint8_t*)0x20000016 = 0x0;
  *(uint8_t*)0x20000017 = 0x0;
  *(uint16_t*)0x20000018 = 0x0;
  *(uint32_t*)0x2000001a = htobe32(0xe0000002);
  *(uint32_t*)0x2000001e = htobe32(0xffffffff);
  *(uint16_t*)0x20000022 = htobe16(0x4e20 + procid * 0x4ul);
  *(uint16_t*)0x20000024 = htobe16(0x4e20 + procid * 0x4ul);
  *(uint8_t*)0x20000026 = 0x4;
  STORE_BY_BITMASK(uint8_t, 0x20000027, 0x1, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20000027, 0x0, 4, 4);
  *(uint16_t*)0x20000028 = 0x0;
  STORE_BY_BITMASK(uint8_t, 0x2000002a, 0x0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x2000002a, 0x0, 1, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000002a, 0x0, 5, 3);
  memcpy((void*)0x2000002b, "\xd1\xc0\x0c", 3);
  *(uint8_t*)0x2000002e = 0x0;
  memcpy((void*)0x2000002f, "\x88\xe3\xfc", 3);
  memcpy((void*)0x20000032, "\xec\xf6\x3f\x14\x44\x19\x9d\xfa\x64\x99"
                            "\x14\xeb\x5a\xe3\xf3\x4d\xef\x70\xfd\xe5"
                            "\xd6\xfe\xa9\x29\xb7\x3f\x64\x45\x0b\x07"
                            "\x37\xb0\x0a\x09\x2c\x86",
         36);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000001a, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000001e, 4);
  uint16_t csum_1_chunk_2 = 0x2100;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x1000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000022, 16);
  *(uint16_t*)0x20000028 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2000000e, 20);
  *(uint16_t*)0x20000018 = csum_inet_digest(&csum_2);
  syscall(__NR_setsockopt, r[0], 0x0, 0x40, 0x20000000, 0x0);
}

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