syzkaller-repros/linux/47a2c6e4115939f630619c64a81fa6c35e229897.c

// KMSAN: uninit-value in tcp_v6_rcv
// https://syzkaller.appspot.com/bug?id=47a2c6e4115939f630619c64a81fa6c35e229897
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <stdint.h>
#include <string.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;
}

uint64_t r[1] = {0xffffffffffffffff};
void loop()
{
  long res = 0;
  res = syscall(__NR_socket, 0xa, 3, 6);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20002fe4 = 0xa;
  *(uint16_t*)0x20002fe6 = htobe16(0);
  *(uint32_t*)0x20002fe8 = 0;
  *(uint8_t*)0x20002fec = 0;
  *(uint8_t*)0x20002fed = 0;
  *(uint8_t*)0x20002fee = 0;
  *(uint8_t*)0x20002fef = 0;
  *(uint8_t*)0x20002ff0 = 0;
  *(uint8_t*)0x20002ff1 = 0;
  *(uint8_t*)0x20002ff2 = 0;
  *(uint8_t*)0x20002ff3 = 0;
  *(uint8_t*)0x20002ff4 = 0;
  *(uint8_t*)0x20002ff5 = 0;
  *(uint8_t*)0x20002ff6 = 0;
  *(uint8_t*)0x20002ff7 = 0;
  *(uint8_t*)0x20002ff8 = 0;
  *(uint8_t*)0x20002ff9 = 0;
  *(uint8_t*)0x20002ffa = 0;
  *(uint8_t*)0x20002ffb = 0;
  *(uint32_t*)0x20002ffc = 0;
  syscall(__NR_connect, r[0], 0x20002fe4, 0x1c);
  *(uint64_t*)0x20000100 = 0;
  *(uint32_t*)0x20000108 = 0;
  *(uint64_t*)0x20000110 = 0x20000ff0;
  *(uint64_t*)0x20000118 = 0;
  *(uint64_t*)0x20000120 = 0x20000040;
  *(uint64_t*)0x20000128 = 0;
  *(uint32_t*)0x20000130 = 0;
  syscall(__NR_sendmsg, r[0], 0x20000100, 0x400c840);
  *(uint64_t*)0x200000c0 = 0;
  *(uint32_t*)0x200000c8 = 0;
  *(uint64_t*)0x200000d0 = 0x20000c40;
  *(uint64_t*)0x20000c40 = 0x20000000;
  memcpy((void*)0x20000000, "\xd7\x11\xa0\xeb\x11\x73\x77\xdc\xd5\x2e\x60\x2e"
                            "\x31\x1d\x7b\x63\xec\x3d\x96\xda",
         20);
  *(uint64_t*)0x20000c48 = 0x14;
  *(uint64_t*)0x200000d8 = 1;
  *(uint64_t*)0x200000e0 = 0x20000cc0;
  *(uint64_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000f0 = 0;
  syscall(__NR_sendmsg, r[0], 0x200000c0, 0);
  *(uint8_t*)0x20000000 = 0xaa;
  *(uint8_t*)0x20000001 = 0xaa;
  *(uint8_t*)0x20000002 = 0xaa;
  *(uint8_t*)0x20000003 = 0xaa;
  *(uint8_t*)0x20000004 = 0xaa;
  *(uint8_t*)0x20000005 = 0xaa;
  *(uint8_t*)0x20000006 = 0xaa;
  *(uint8_t*)0x20000007 = 0xaa;
  *(uint8_t*)0x20000008 = 0xaa;
  *(uint8_t*)0x20000009 = 0xaa;
  *(uint8_t*)0x2000000a = 0xaa;
  *(uint8_t*)0x2000000b = 0;
  *(uint16_t*)0x2000000c = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000f, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2000000f, 0, 2, 6);
  *(uint16_t*)0x20000010 = htobe16(0x14);
  *(uint16_t*)0x20000012 = htobe16(0);
  *(uint16_t*)0x20000014 = htobe16(0);
  *(uint8_t*)0x20000016 = 0;
  *(uint8_t*)0x20000017 = 1;
  *(uint16_t*)0x20000018 = 0;
  *(uint32_t*)0x2000001a = htobe32(0);
  *(uint32_t*)0x2000001e = htobe32(0xe0000001);
  *(uint8_t*)0x20000022 = 8;
  *(uint8_t*)0x20000023 = 0;
  *(uint16_t*)0x20000024 = 0;
  *(uint32_t*)0x20000026 = htobe32(0);
  *(uint32_t*)0x20000040 = 0;
  *(uint32_t*)0x20000044 = 0;
  *(uint32_t*)0x20000048 = 0;
  *(uint32_t*)0x2000004c = 0;
  *(uint32_t*)0x20000050 = 0;
  *(uint32_t*)0x20000054 = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000022, 8);
  *(uint16_t*)0x20000024 = 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);
}

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