syzkaller-repros/linux/093e7092e01bed192b564b04528826cc6f1dbf91.c

// BUG: pagefault on kernel address ADDR in non-whitelisted uaccess
// https://syzkaller.appspot.com/bug?id=093e7092e01bed192b564b04528826cc6f1dbf91
// status:fixed
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

static long syz_open_dev(long a0, long a1, long 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) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  long res = 0;
  memcpy((void*)0x20000040, "/dev/video#", 12);
  res = syz_open_dev(0x20000040, 0x6287, 0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x20000100 = 3;
  *(uint32_t*)0x20000108 = 0;
  *(uint32_t*)0x2000010c = 0;
  *(uint32_t*)0x20000110 = 0;
  *(uint32_t*)0x20000114 = 0;
  *(uint32_t*)0x20000118 = 0;
  *(uint32_t*)0x2000011c = 0;
  *(uint64_t*)0x20000120 = 0x20000200;
  *(uint32_t*)0x20000200 = 0xca;
  *(uint32_t*)0x20000204 = 0;
  *(uint32_t*)0x20000208 = 0;
  *(uint32_t*)0x2000020c = 0;
  *(uint64_t*)0x20000210 = 0;
  *(uint32_t*)0x20000128 = 2;
  *(uint64_t*)0x20000130 = 0x20000240;
  *(uint8_t*)0x20000138 = 0;
  syscall(__NR_ioctl, r[0], 0xc0d05605, 0x20000100);
  memcpy((void*)0x20000040, "/dev/video#", 12);
  res = syz_open_dev(0x20000040, 0x107fff, 0);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20000240 = 2;
  syscall(__NR_ioctl, r[1], 0xc0045627, 0x20000240);
  *(uint32_t*)0x200000c0 = 3;
  *(uint32_t*)0x200000c8 = 0;
  *(uint32_t*)0x200000cc = 0;
  *(uint32_t*)0x200000d0 = 0;
  *(uint32_t*)0x200000d4 = 0;
  *(uint32_t*)0x200000d8 = 0;
  *(uint32_t*)0x200000dc = 0;
  *(uint64_t*)0x200000e0 = 0x20000080;
  *(uint32_t*)0x20000080 = 0;
  *(uint32_t*)0x20000084 = 0;
  *(uint32_t*)0x20000088 = 0;
  *(uint32_t*)0x2000008c = 0;
  *(uint64_t*)0x20000090 = 0x20000000;
  *(uint32_t*)0x20000000 = 0;
  *(uint32_t*)0x20000004 = 0;
  *(uint32_t*)0x20000008 = 0;
  *(uint32_t*)0x2000000c = 0;
  *(uint64_t*)0x20000010 = 0;
  *(uint32_t*)0x200000e8 = 0;
  *(uint64_t*)0x200000f0 = 0x200000c0;
  *(uint8_t*)0x200000f8 = 0;
  syscall(__NR_ioctl, r[1], 0xc0d05604, 0x200000c0);
  return 0;
}