syzkaller-repros/linux/819b961360c4c42e1487eddb71135bd3de683d0e.c

// KMSAN: uninit-value in fib4_rule_match
// https://syzkaller.appspot.com/bug?id=819b961360c4c42e1487eddb71135bd3de683d0e
// 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;
}

static void execute_one();
extern unsigned long long procid;

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

uint64_t r[1] = {0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  *(uint8_t*)0x2000a000 = -1;
  *(uint8_t*)0x2000a001 = 0xe0;
  *(uint8_t*)0x2000a002 = -1;
  *(uint8_t*)0x2000a003 = -1;
  *(uint8_t*)0x2000a004 = -1;
  *(uint8_t*)0x2000a005 = -1;
  *(uint8_t*)0x2000a006 = -1;
  *(uint8_t*)0x2000a007 = -1;
  *(uint8_t*)0x2000a008 = -1;
  *(uint8_t*)0x2000a009 = -1;
  *(uint8_t*)0x2000a00a = -1;
  *(uint8_t*)0x2000a00b = -1;
  *(uint16_t*)0x2000a00c = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, 0x2000a00e, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000a00e, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000a00f, 0xe, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2000a00f, 0, 2, 6);
  *(uint16_t*)0x2000a010 = htobe16(0xfec3);
  *(uint16_t*)0x2000a012 = htobe16(0);
  *(uint16_t*)0x2000a014 = htobe16(0);
  *(uint8_t*)0x2000a016 = 0;
  *(uint8_t*)0x2000a017 = 0x29;
  *(uint16_t*)0x2000a018 = 0;
  *(uint8_t*)0x2000a01a = 0xac;
  *(uint8_t*)0x2000a01b = 0x14;
  *(uint8_t*)0x2000a01c = -1;
  *(uint8_t*)0x2000a01d = 0xbb;
  *(uint32_t*)0x2000a01e = htobe32(0xe0000001);
  *(uint16_t*)0x2000a022 = htobe16(0);
  *(uint16_t*)0x2000a024 = htobe16(0);
  *(uint16_t*)0x2000a026 = htobe16(8);
  *(uint16_t*)0x2000a028 = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000a01a, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000a01e, 4);
  uint16_t csum_1_chunk_2 = 0x1100;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x800;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x2000a022, 8);
  *(uint16_t*)0x2000a028 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2000a00e, 20);
  *(uint16_t*)0x2000a018 = csum_inet_digest(&csum_2);
  res = syscall(__NR_socket, 0x10, 3, 0);
  if (res != -1)
    r[0] = res;
  *(uint64_t*)0x20000240 = 0x20000040;
  *(uint16_t*)0x20000040 = 0x10;
  *(uint16_t*)0x20000042 = 0;
  *(uint32_t*)0x20000044 = 0;
  *(uint32_t*)0x20000048 = 0;
  *(uint32_t*)0x20000248 = 0xc;
  *(uint64_t*)0x20000250 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0x20000000;
  *(uint32_t*)0x20000000 = 0x38;
  *(uint16_t*)0x20000004 = 0x20;
  *(uint16_t*)0x20000006 = 0x21;
  *(uint32_t*)0x20000008 = 0;
  *(uint32_t*)0x2000000c = 0;
  *(uint8_t*)0x20000010 = 2;
  *(uint8_t*)0x20000011 = 0;
  *(uint8_t*)0x20000012 = 0;
  *(uint8_t*)0x20000013 = 0;
  *(uint8_t*)0x20000014 = 0;
  *(uint8_t*)0x20000015 = 0;
  *(uint8_t*)0x20000016 = 0;
  *(uint32_t*)0x20000018 = 0;
  *(uint32_t*)0x2000001c = 0x11;
  *(uint16_t*)0x20000020 = 8;
  *(uint16_t*)0x20000022 = 0xb;
  *(uint32_t*)0x20000024 = 0;
  *(uint16_t*)0x20000028 = 8;
  *(uint16_t*)0x2000002a = 2;
  *(uint32_t*)0x2000002c = htobe32(0);
  *(uint16_t*)0x20000030 = 8;
  *(uint16_t*)0x20000032 = 0x17;
  *(uint16_t*)0x20000034 = htobe16(0x4e21);
  *(uint16_t*)0x20000036 = htobe16(0x4e24);
  *(uint64_t*)0x200000c8 = 0x38;
  *(uint64_t*)0x20000258 = 1;
  *(uint64_t*)0x20000260 = 0;
  *(uint64_t*)0x20000268 = 0;
  *(uint32_t*)0x20000270 = 0;
  syscall(__NR_sendmsg, r[0], 0x20000240, 0);
  syscall(__NR_socket, 0xa, 2, 0);
}

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