syzkaller-repros/linux/3c5f3a8f9011e7dbba102bb0ad7738de16df73be.c

// BUG: unable to handle kernel paging request in ata_bmdma_qc_prep
// https://syzkaller.appspot.com/bug?id=3c5f3a8f9011e7dbba102bb0ad7738de16df73be
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <fcntl.h>
#include <stdint.h>
#include <stdio.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[38];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  memcpy((void*)0x20790ff7, "\x2f\x64\x65\x76\x2f\x73\x67\x23\x00", 9);
  r[2] = syz_open_dev(0x20790ff7ul, 0x1ul, 0x1a3001ul);
  memcpy((void*)0x20883000, "\x12", 1);
  r[4] = syscall(__NR_ioctl, r[2], 0x4000000002283ul, 0x20883000ul);
  *(uint8_t*)0x20515000 = (uint8_t)0x0;
  *(uint8_t*)0x20515001 = (uint8_t)0x0;
  *(uint16_t*)0x20515002 = (uint16_t)0x0;
  *(uint16_t*)0x20515004 = (uint16_t)0x0;
  *(uint16_t*)0x20515006 = (uint16_t)0x0;
  *(uint16_t*)0x20515008 = (uint16_t)0x0;
  STORE_BY_BITMASK(uint8_t, 0x2051500a, 0x6, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2051500a, 0x4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2051500b, 0x0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2051500b, 0x0, 2, 6);
  *(uint16_t*)0x2051500c = (uint16_t)0xbd00;
  *(uint16_t*)0x2051500e = (uint16_t)0x6400;
  *(uint16_t*)0x20515010 = (uint16_t)0x0;
  *(uint8_t*)0x20515012 = (uint8_t)0x0;
  *(uint8_t*)0x20515013 = (uint8_t)0x0;
  *(uint16_t*)0x20515014 = (uint16_t)0x0;
  *(uint32_t*)0x20515016 = (uint32_t)0x0;
  *(uint8_t*)0x2051501a = (uint8_t)0xac;
  *(uint8_t*)0x2051501b = (uint8_t)0x14;
  *(uint8_t*)0x2051501c = (uint8_t)0x0;
  *(uint8_t*)0x2051501d = (uint8_t)0xbb;
  *(uint8_t*)0x2051501e = (uint8_t)0x0;
  *(uint8_t*)0x20515022 = (uint8_t)0x37;
  *(uint8_t*)0x20515023 = (uint8_t)0x0;
  *(uint16_t*)0x20515024 = (uint16_t)0x0;
  *(uint8_t*)0x20515026 = (uint8_t)0xac;
  *(uint8_t*)0x20515027 = (uint8_t)0x14;
  *(uint8_t*)0x20515028 = (uint8_t)0x0;
  *(uint8_t*)0x20515029 = (uint8_t)0xaa;
  memcpy((void*)0x2051502a,
         "\xa8\x79\xc6\xc0\xee\x09\xf6\x3f\x13\xab\x22\xc1\x85\x59\x78"
         "\xd4\x3f\xcf\xce\x0c\x8a\xd4\x15\x9e\x23\x34\x66\xc4\x7c\x4a"
         "\x0c\xbf\x54\xc1\x4e\x8a\x75\x01\x18\x84\x9a\x32\x38\xda\x92"
         "\x43\xa6\x83\x76\x72\xc7\x31\xaf\xad\x86\x8e\x01\x83\xcc\xef"
         "\x88\x9e\x70\x54\xc8\xe4\x83\x7f\x25\xa2\xa9\x8d\xea\x7d\xc6"
         "\x5f\x38\x50\xb1\x15\x31\xa1\x94\xf0\xae\xd2\x91\x44\xfa\xf3"
         "\x23\x0a\x4f\xe2\x76\x95\x26\x10\x67\x70\x19\x24\x2c\x1d\x3e"
         "\x2f\x45\x45\xb6\xef\x6e\x02\x39\x79\x49\x7e\x82\x96\x62\x71"
         "\x61\x72\xd4\xde\x51\xcb\x95\x5a\x5f\x7e\x72\x1a\xe4\x4f\x68"
         "\xa6\xaa\x26\xdb\x4b\x62\xba\x93\x3a\x03\xaf\xe6\xff\x88\x5c"
         "\x96\xce\x4d\x08\x47\x86\x4f",
         157);
  struct csum_inet csum_35;
  csum_inet_init(&csum_35);
  csum_inet_update(&csum_35, (const uint8_t*)0x20515022, 165);
  *(uint16_t*)0x20515024 = csum_inet_digest(&csum_35);
  struct csum_inet csum_36;
  csum_inet_init(&csum_36);
  csum_inet_update(&csum_36, (const uint8_t*)0x2051500a, 24);
  *(uint16_t*)0x20515014 = csum_inet_digest(&csum_36);
  r[37] = syscall(__NR_write, r[2], 0x20515000ul, 0xc7ul);
}

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