syzkaller-repros/linux/5201ef9acc2312de450ad1a469760d7c5a802c9d.c

// KMSAN: uninit-value in do_error_trap
// https://syzkaller.appspot.com/bug?id=5201ef9acc2312de450ad1a469760d7c5a802c9d
// 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;
  *(uint8_t*)0x20000240 = -1;
  *(uint8_t*)0x20000241 = -1;
  *(uint8_t*)0x20000242 = -1;
  *(uint8_t*)0x20000243 = -1;
  *(uint8_t*)0x20000244 = -1;
  *(uint8_t*)0x20000245 = -1;
  *(uint8_t*)0x20000246 = 1;
  *(uint8_t*)0x20000247 = 0x80;
  *(uint8_t*)0x20000248 = 0xc2;
  *(uint8_t*)0x20000249 = 0;
  *(uint8_t*)0x2000024a = 0;
  *(uint8_t*)0x2000024b = 0;
  *(uint16_t*)0x2000024c = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, 0x2000024e, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000024e, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000024f, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2000024f, 0, 2, 6);
  *(uint16_t*)0x20000250 = htobe16(0x1c);
  *(uint16_t*)0x20000252 = htobe16(0);
  *(uint16_t*)0x20000254 = htobe16(0);
  *(uint8_t*)0x20000256 = 0;
  *(uint8_t*)0x20000257 = 0;
  *(uint16_t*)0x20000258 = 0;
  *(uint8_t*)0x2000025a = 0xac;
  *(uint8_t*)0x2000025b = 0x14;
  *(uint8_t*)0x2000025c = 0x14;
  *(uint8_t*)0x2000025d = 0xaa;
  *(uint32_t*)0x2000025e = htobe32(-1);
  *(uint8_t*)0x20000262 = 0;
  *(uint8_t*)0x20000263 = 0;
  *(uint16_t*)0x20000264 = 0;
  *(uint32_t*)0x20000266 = htobe32(0xe0000002);
  *(uint32_t*)0x20000080 = 0;
  *(uint32_t*)0x20000084 = 0;
  *(uint32_t*)0x20000088 = 0x7dd;
  *(uint32_t*)0x2000008c = 0;
  *(uint32_t*)0x20000090 = 0;
  *(uint32_t*)0x20000094 = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20000262, 8);
  *(uint16_t*)0x20000264 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2000024e, 20);
  *(uint16_t*)0x20000258 = csum_inet_digest(&csum_2);
  res = syscall(__NR_socket, 2, 3, 0x3e);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20ee9ff0 = 2;
  *(uint16_t*)0x20ee9ff2 = htobe16(0);
  *(uint32_t*)0x20ee9ff4 = htobe32(0);
  *(uint8_t*)0x20ee9ff8 = 0;
  *(uint8_t*)0x20ee9ff9 = 0;
  *(uint8_t*)0x20ee9ffa = 0;
  *(uint8_t*)0x20ee9ffb = 0;
  *(uint8_t*)0x20ee9ffc = 0;
  *(uint8_t*)0x20ee9ffd = 0;
  *(uint8_t*)0x20ee9ffe = 0;
  *(uint8_t*)0x20ee9fff = 0;
  syscall(__NR_sendto, r[0], 0x20ef4000, 0, 0, 0x20ee9ff0, 0x10);
  memcpy((void*)0x20000200, "/proc/self/net/pfkey", 21);
  syscall(__NR_openat, 0xffffffffffffff9c, 0x20000200, 0x44c00, 0);
  *(uint64_t*)0x200001c0 = 0;
  *(uint64_t*)0x200001c8 = 0x989680;
  syscall(__NR_recvmmsg, r[0], 0x20000140, 0x50, 2, 0x200001c0);
}

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