// https://syzkaller.appspot.com/bug?id=ac7d83330e5b421283436e44cb7e186da15b8f9c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/loop.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

extern unsigned long long procid;

struct fs_image_segment {
  void* data;
  uintptr_t size;
  uintptr_t offset;
};

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (32 << 20)

#define SYZ_memfd_create 319

static uintptr_t syz_mount_image(uintptr_t fs, uintptr_t dir, uintptr_t size,
                                 uintptr_t nsegs, uintptr_t segments,
                                 uintptr_t flags, uintptr_t opts)
{
  char loopname[64];
  int loopfd, err = 0, res = -1;
  uintptr_t i;
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;

  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (i = 0; i < nsegs; i++) {
    if (segs[i].size > IMAGE_MAX_SIZE)
      segs[i].size = IMAGE_MAX_SIZE;
    segs[i].offset %= IMAGE_MAX_SIZE;
    if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
      segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
    if (size < segs[i].offset + segs[i].offset)
      size = segs[i].offset + segs[i].offset;
  }
  if (size > IMAGE_MAX_SIZE)
    size = IMAGE_MAX_SIZE;
  int memfd = syscall(SYZ_memfd_create, "syz_mount_image", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (i = 0; i < nsegs; i++) {
    if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
    }
  }
  snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  mkdir((char*)dir, 0777);
  if (strcmp((char*)fs, "iso9660") == 0)
    flags |= MS_RDONLY;
  if (mount(loopname, (char*)dir, (char*)fs, flags, (char*)opts)) {
    err = errno;
    goto error_clear_loop;
  }
  res = 0;
error_clear_loop:
  ioctl(loopfd, LOOP_CLR_FD, 0);
error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return res;
}

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

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

unsigned long long procid;
void execute_one()
{
  memcpy((void*)0x20000040, "gfs2", 5);
  memcpy((void*)0x20000080, "./file0", 8);
  memcpy((void*)0x20004940,
         "\x6c\x6f\x63\x6b\x70\x72\x6f\x74\x6f\x3d\x6c\x6f\x63\x6b\x5f\x6e\x6f"
         "\x6c\x6f\x63\x6b\x2c\x6c\x6f\x63\x6b\x74\x61\x62\x6c\x65\x3d\x67\x66"
         "\x73\x32\x6d\x65\x74\x61\x00\x2c\x00\xb6\x91\x27\x03\x2f\x72\x0d\xdf"
         "\x13\x64\x60\x39\x3f\x3b\x1b\xb7\x6b\x50\xd9\x6a\x27\x10\xfb\x10\xd4"
         "\xe5\x7f\x8a\xe6\xbb\x28\x2d\x9c\xeb\xc7\x3c\x3a\x5c\xeb\x5f\xe5\x6a"
         "\xe3\x13\x7c\xd6\x47\x1d\xba\x88\xda\x49\x41\xf4\x09\xd2\x87\x05\xc4"
         "\xa3\xc9\x0e\x27\xff\x7f\x30\xbb\x9f\x57\x7d\x80\x87\xc5\x5e\xce\xfe"
         "\x7d\x94\xb2\xc1\x83\x55\x22\xc3\x2c\xf1\x3b\xb3\x5e\x17\x88\xdf\x01"
         "\xe1\x64\x17\xc6\x7c\x44\x43\xb8\xd7\xbc\x23\x5c\xd1\xe5\xc8\xe8\x72"
         "\x38\x9c\x3b\x3c\x38\x51\x48\x99\x6f\x11\x4c\xf6\xb2\x71\x01\x51\xbd"
         "\x1b\x14\xaa\xf0",
         174);
  syz_mount_image(0x20000040, 0x20000080, 0, 0, 0x20000440, 0, 0x20004940);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}