syzkaller-repros/linux/7c86e19e2b252ed8113e07ed622699db13d3d2f4.c

// KMSAN: uninit-value in move_addr_to_user
// https://syzkaller.appspot.com/bug?id=7c86e19e2b252ed8113e07ed622699db13d3d2f4
// status:fixed
// 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, 5, 0x84);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20223fd4 = 0xa;
  *(uint16_t*)0x20223fd6 = htobe16(0x4e23);
  *(uint32_t*)0x20223fd8 = 0;
  *(uint8_t*)0x20223fdc = 0;
  *(uint8_t*)0x20223fdd = 0;
  *(uint8_t*)0x20223fde = 0;
  *(uint8_t*)0x20223fdf = 0;
  *(uint8_t*)0x20223fe0 = 0;
  *(uint8_t*)0x20223fe1 = 0;
  *(uint8_t*)0x20223fe2 = 0;
  *(uint8_t*)0x20223fe3 = 0;
  *(uint8_t*)0x20223fe4 = 0;
  *(uint8_t*)0x20223fe5 = 0;
  *(uint8_t*)0x20223fe6 = 0;
  *(uint8_t*)0x20223fe7 = 0;
  *(uint8_t*)0x20223fe8 = 0;
  *(uint8_t*)0x20223fe9 = 0;
  *(uint8_t*)0x20223fea = 0;
  *(uint8_t*)0x20223feb = 0;
  *(uint32_t*)0x20223fec = 0;
  syscall(__NR_setsockopt, r[0], 0x84, 0x64, 0x20223fd4, 0x1c);
  memcpy((void*)0x20ac0fbb, "\xc4", 1);
  *(uint16_t*)0x206e2000 = 2;
  *(uint16_t*)0x206e2002 = htobe16(0x4e23);
  *(uint32_t*)0x206e2004 = htobe32(0x7f000001);
  *(uint8_t*)0x206e2008 = 0;
  *(uint8_t*)0x206e2009 = 0;
  *(uint8_t*)0x206e200a = 0;
  *(uint8_t*)0x206e200b = 0;
  *(uint8_t*)0x206e200c = 0;
  *(uint8_t*)0x206e200d = 0;
  *(uint8_t*)0x206e200e = 0;
  *(uint8_t*)0x206e200f = 0;
  syscall(__NR_sendto, r[0], 0x20ac0fbb, 1, 0, 0x206e2000, 0x10);
  *(uint32_t*)0x2056effc = 0;
  syscall(__NR_setsockopt, r[0], 0x84, 0xc, 0x2056effc, 4);
  *(uint64_t*)0x20003ac0 = 0x20003880;
  *(uint32_t*)0x20003ac8 = 0x80;
  *(uint64_t*)0x20003ad0 = 0x20003a40;
  *(uint64_t*)0x20003ad8 = 0;
  *(uint64_t*)0x20003ae0 = 0x20003a80;
  *(uint64_t*)0x20003ae8 = 0x2f;
  *(uint32_t*)0x20003af0 = 0;
  *(uint32_t*)0x20003af8 = 0;
  *(uint64_t*)0x20003bc0 = 0x77359400;
  *(uint64_t*)0x20003bc8 = 0;
  syscall(__NR_recvmmsg, r[0], 0x20003ac0, 1, 0, 0x20003bc0);
  *(uint8_t*)0x200001c0 = 0xaa;
  *(uint8_t*)0x200001c1 = 0xaa;
  *(uint8_t*)0x200001c2 = 0xaa;
  *(uint8_t*)0x200001c3 = 0xaa;
  *(uint8_t*)0x200001c4 = 0xaa;
  *(uint8_t*)0x200001c5 = 0xaa;
  *(uint8_t*)0x200001c6 = 0;
  *(uint8_t*)0x200001c7 = 0;
  *(uint8_t*)0x200001c8 = 0;
  *(uint8_t*)0x200001c9 = 0;
  *(uint8_t*)0x200001ca = 0;
  *(uint8_t*)0x200001cb = 0;
  *(uint16_t*)0x200001cc = htobe16(0x86dd);
  STORE_BY_BITMASK(uint8_t, 0x200001ce, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x200001ce, 6, 4, 4);
  memcpy((void*)0x200001cf, "\x50\xa0\x9c", 3);
  *(uint16_t*)0x200001d2 = htobe16(8);
  *(uint8_t*)0x200001d4 = 0x2b;
  *(uint8_t*)0x200001d5 = 0;
  *(uint8_t*)0x200001d6 = 0xfe;
  *(uint8_t*)0x200001d7 = 0x80;
  *(uint8_t*)0x200001d8 = 0;
  *(uint8_t*)0x200001d9 = 0;
  *(uint8_t*)0x200001da = 0;
  *(uint8_t*)0x200001db = 0;
  *(uint8_t*)0x200001dc = 0;
  *(uint8_t*)0x200001dd = 0;
  *(uint8_t*)0x200001de = 0;
  *(uint8_t*)0x200001df = 0;
  *(uint8_t*)0x200001e0 = 0;
  *(uint8_t*)0x200001e1 = 0;
  *(uint8_t*)0x200001e2 = 0;
  *(uint8_t*)0x200001e3 = 0;
  *(uint8_t*)0x200001e4 = 0;
  *(uint8_t*)0x200001e5 = 0xbb;
  *(uint8_t*)0x200001e6 = 0xfe;
  *(uint8_t*)0x200001e7 = 0x80;
  *(uint8_t*)0x200001e8 = 0;
  *(uint8_t*)0x200001e9 = 0;
  *(uint8_t*)0x200001ea = 0;
  *(uint8_t*)0x200001eb = 0;
  *(uint8_t*)0x200001ec = 0;
  *(uint8_t*)0x200001ed = 0;
  *(uint8_t*)0x200001ee = 0;
  *(uint8_t*)0x200001ef = 0;
  *(uint8_t*)0x200001f0 = 0;
  *(uint8_t*)0x200001f1 = 0;
  *(uint8_t*)0x200001f2 = 0;
  *(uint8_t*)0x200001f3 = 0;
  *(uint8_t*)0x200001f4 = 0;
  *(uint8_t*)0x200001f5 = 0xaa;
  *(uint16_t*)0x200001f6 = htobe16(0);
  *(uint16_t*)0x200001f8 = htobe16(0);
  *(uint16_t*)0x200001fa = htobe16(8);
  *(uint16_t*)0x200001fc = 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*)0x200001d6, 16);
  csum_inet_update(&csum_1, (const uint8_t*)0x200001e6, 16);
  uint32_t csum_1_chunk_2 = 0x8000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
  uint32_t csum_1_chunk_3 = 0x11000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x200001f6, 8);
  *(uint16_t*)0x200001fc = csum_inet_digest(&csum_1);
}

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