syzkaller-repros/linux/bcdb4bdc9c0ad4a0fdb3457932e5b860b01ee824.c

// WARNING in usercopy_warn
// https://syzkaller.appspot.com/bug?id=bcdb4bdc9c0ad4a0fdb3457932e5b860b01ee824
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <string.h>
#include <sys/stat.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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

long r[6];
void loop()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  r[0] = syscall(__NR_socket, 2, 1, 0);
  memcpy((void*)0x20641ff3, "/dev/net/tun", 13);
  r[1] = syz_open_dev(0x20641ff3, 0, 0);
  r[2] = syscall(__NR_fcntl, r[1], 0, r[1]);
  r[3] = syscall(__NR_socket, 0x10002000000011, 0x8000000080003, 8);
  *(uint8_t*)0x20927fd8 = 0x73;
  *(uint8_t*)0x20927fd9 = 0x79;
  *(uint8_t*)0x20927fda = 0x7a;
  *(uint8_t*)0x20927fdb = 0x30;
  *(uint8_t*)0x20927fdc = 0;
  *(uint32_t*)0x20927fe8 = 5;
  *(uint32_t*)0x20927fec = 0;
  *(uint64_t*)0x20927ff0 = 0x20c15000;
  *(uint32_t*)0x20c15000 = 0;
  *(uint32_t*)0x20c15004 = 0;
  *(uint16_t*)0x20c15008 = 0;
  syscall(__NR_ioctl, r[1], 0x400454ca, 0x20927fd8);
  *(uint8_t*)0x2062ffe0 = 0x73;
  *(uint8_t*)0x2062ffe1 = 0x79;
  *(uint8_t*)0x2062ffe2 = 0x7a;
  *(uint8_t*)0x2062ffe3 = 0x30;
  *(uint8_t*)0x2062ffe4 = 0;
  *(uint16_t*)0x2062fff0 = 0x301;
  syscall(__NR_ioctl, r[0], 0x8914, 0x2062ffe0);
  *(uint8_t*)0x2086d000 = 0x73;
  *(uint8_t*)0x2086d001 = 0x79;
  *(uint8_t*)0x2086d002 = 0x7a;
  *(uint8_t*)0x2086d003 = 0x30;
  *(uint8_t*)0x2086d004 = 0;
  *(uint32_t*)0x2086d010 = 0;
  *(uint8_t*)0x2086d014 = 0;
  *(uint8_t*)0x2086d015 = 0;
  *(uint8_t*)0x2086d016 = 0;
  *(uint8_t*)0x2086d017 = 0;
  *(uint8_t*)0x2086d018 = 0;
  *(uint8_t*)0x2086d019 = 0;
  *(uint8_t*)0x2086d01a = 0;
  *(uint8_t*)0x2086d01b = 0;
  *(uint8_t*)0x2086d01c = 0;
  *(uint8_t*)0x2086d01d = 0;
  *(uint8_t*)0x2086d01e = 0;
  *(uint8_t*)0x2086d01f = 0;
  *(uint8_t*)0x2086d020 = 0;
  *(uint8_t*)0x2086d021 = 0;
  *(uint8_t*)0x2086d022 = 0;
  *(uint8_t*)0x2086d023 = 0;
  *(uint8_t*)0x2086d024 = 0;
  *(uint8_t*)0x2086d025 = 0;
  *(uint8_t*)0x2086d026 = 0;
  *(uint8_t*)0x2086d027 = 0;
  if (syscall(__NR_ioctl, r[3], 0x8933, 0x2086d000) != -1)
    r[4] = *(uint32_t*)0x2086d010;
  *(uint16_t*)0x20c85000 = 0x11;
  *(uint16_t*)0x20c85002 = htobe16(0);
  *(uint32_t*)0x20c85004 = r[4];
  *(uint16_t*)0x20c85008 = 1;
  *(uint8_t*)0x20c8500a = 0;
  *(uint8_t*)0x20c8500b = 6;
  *(uint8_t*)0x20c8500c = 0xaa;
  *(uint8_t*)0x20c8500d = 0xaa;
  *(uint8_t*)0x20c8500e = 0xaa;
  *(uint8_t*)0x20c8500f = 0xaa;
  *(uint8_t*)0x20c85010 = 0;
  *(uint8_t*)0x20c85011 = 0;
  *(uint8_t*)0x20c85012 = 0;
  *(uint8_t*)0x20c85013 = 0;
  syscall(__NR_bind, r[3], 0x20c85000, 0x14);
  r[5] = syscall(__NR_dup2, r[3], r[2]);
  *(uint32_t*)0x206a6000 = 0x9c2;
  syscall(__NR_setsockopt, r[3], 1, 0x25, 0x206a6000, 4);
  *(uint8_t*)0x2070ff88 = 0;
  *(uint8_t*)0x2070ff89 = 1;
  *(uint16_t*)0x2070ff8a = 0;
  *(uint16_t*)0x2070ff8c = 8;
  *(uint16_t*)0x2070ff8e = 0;
  *(uint16_t*)0x2070ff90 = 0;
  STORE_BY_BITMASK(uint8_t, 0x2070ff92, 5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2070ff92, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2070ff93, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2070ff93, 0, 2, 6);
  *(uint16_t*)0x2070ff94 = htobe16(0x1c);
  *(uint16_t*)0x2070ff96 = 0;
  *(uint16_t*)0x2070ff98 = htobe16(0);
  *(uint8_t*)0x2070ff9a = 0;
  *(uint8_t*)0x2070ff9b = 4;
  *(uint16_t*)0x2070ff9c = 0;
  *(uint32_t*)0x2070ff9e = htobe32(0xe0000001);
  *(uint8_t*)0x2070ffa2 = 0xac;
  *(uint8_t*)0x2070ffa3 = 0x14;
  *(uint8_t*)0x2070ffa4 = 0;
  *(uint8_t*)0x2070ffa5 = 0xaa;
  *(uint16_t*)0x2070ffa6 = htobe16(0x4e20);
  *(uint16_t*)0x2070ffa8 = 0;
  *(uint16_t*)0x2070ffaa = htobe16(8);
  *(uint16_t*)0x2070ffac = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x2070ff9e, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x2070ffa2, 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*)0x2070ffa6, 8);
  *(uint16_t*)0x2070ffac = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x2070ff92, 20);
  *(uint16_t*)0x2070ff9c = csum_inet_digest(&csum_2);
  syscall(__NR_write, r[2], 0x2070ff88, 0x26);
  *(uint64_t*)0x20ef7fc4 = 0x20b8ffae;
  *(uint32_t*)0x20ef7fcc = 0x52;
  *(uint64_t*)0x20ef7fd4 = 0x20c4c000;
  *(uint64_t*)0x20ef7fdc = 3;
  *(uint64_t*)0x20ef7fe4 = 0x2076c20e;
  *(uint64_t*)0x20ef7fec = 0xc7;
  *(uint32_t*)0x20ef7ff4 = 8;
  *(uint32_t*)0x20ef7ffc = 7;
  *(uint64_t*)0x20c4c000 = 0x20ae6000;
  *(uint64_t*)0x20c4c008 = 0x91;
  *(uint64_t*)0x20c4c010 = 0x2077c000;
  *(uint64_t*)0x20c4c018 = 0xac;
  *(uint64_t*)0x20c4c020 = 0x20c4ff40;
  *(uint64_t*)0x20c4c028 = 0xc0;
  syscall(__NR_recvmmsg, r[5], 0x20ef7fc4, 1, 0x2000, 0x20000000);
}

int main()
{
  loop();
  return 0;
}