// https://syzkaller.appspot.com/bug?id=bc53e85960a9fa2d7557dab3ca6d211f162abc2a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.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>

#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static unsigned long long procid;

struct fs_image_segment {
  void* data;
  uintptr_t size;
  uintptr_t offset;
};
static int setup_loop_device(long unsigned size, long unsigned nsegs,
                             struct fs_image_segment* segs,
                             const char* loopname, int* memfd_p, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (size_t i = 0; i < nsegs; i++) {
    if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
    }
  }
  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;
    }
  }
  *memfd_p = memfd;
  *loopfd_p = loopfd;
  return 0;

error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return -1;
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile unsigned long size,
                            volatile unsigned long nsegs,
                            volatile long segments, volatile long flags,
                            volatile long optsarg, volatile long change_dir)
{
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;
  int res = -1, err = 0, loopfd = -1, memfd = -1, need_loop_device = !!segs;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(size, nsegs, segs, loopname, &memfd, &loopfd) == -1)
      return -1;
    source = loopname;
  }
  mkdir(target, 0777);
  char opts[256];
  memset(opts, 0, sizeof(opts));
  if (strlen(mount_opts) > (sizeof(opts) - 32)) {
  }
  strncpy(opts, mount_opts, sizeof(opts) - 32);
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  }
  res = mount(source, target, fs, flags, opts);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  res = open(target, O_RDONLY | O_DIRECTORY);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  if (change_dir) {
    res = chdir(target);
    if (res == -1) {
      err = errno;
    }
  }

error_clear_loop:
  if (need_loop_device) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
    close(memfd);
  }
  errno = err;
  return res;
}

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);

  memcpy((void*)0x20000080, "gfs2\000", 5);
  memcpy((void*)0x200000c0, "./file0\000", 8);
  *(uint64_t*)0x20000300 = 0x20000000;
  memcpy((void*)0x20000000, "\xe3\x59\xb7\x7c\xac\x99\xe0", 7);
  *(uint64_t*)0x20000308 = 7;
  *(uint64_t*)0x20000310 = 0;
  *(uint64_t*)0x20000318 = 0x20000180;
  memcpy((void*)0x20000180,
         "\x9b\x61\xf3\xe0\xbd\x92\x26\x62\x88\xa6\x67\x32\x79\x7b\x23\x64\xf5"
         "\xec\xa3\x08\x4d\xa8\xa7\x77\x51\x12\xb4\x26\xdf\x20\x4d\xb3\xf5\x9b"
         "\x71\xa7\x2c\x65\x5e\x87\x57\xba\x78\x79\x90\x34\xb9\xdf\xde\xd3\x44"
         "\x73\xfb\xe8\xc2\xb5\xb5\x99\xe3\x27\x0a\x00\x76\x1e\xea\x8a\x4b\xe5"
         "\x10\xc7\x23\x6b\xe1\x09\x9a\x3c\xc2\x50\xf5\xdf\xc7\x63\x1c\xc6\x2d"
         "\xdf\x56\x2b\x01\xa5\x61\x9f\xcd\x82\xe6",
         95);
  *(uint64_t*)0x20000320 = 0x5f;
  *(uint64_t*)0x20000328 = 7;
  memcpy((void*)0x20000340, "hostdata", 8);
  *(uint8_t*)0x20000348 = 0x3d;
  *(uint8_t*)0x20000349 = 0x2c;
  memcpy((void*)0x2000034a, "noloccookie", 11);
  *(uint8_t*)0x20000355 = 0x2c;
  memcpy((void*)0x20000356, "commit", 6);
  *(uint8_t*)0x2000035c = 0x3d;
  sprintf((char*)0x2000035d, "0x%016llx", (long long)0xffff);
  *(uint8_t*)0x2000036f = 0x2c;
  memcpy((void*)0x20000370, "seclabel", 8);
  *(uint8_t*)0x20000378 = 0x2c;
  memcpy((void*)0x20000379, "uid>", 4);
  sprintf((char*)0x2000037d, "%020llu", (long long)0xee00);
  *(uint8_t*)0x20000391 = 0x2c;
  memcpy((void*)0x20000392, "uid", 3);
  *(uint8_t*)0x20000395 = 0x3d;
  sprintf((char*)0x20000396, "%020llu", (long long)0);
  *(uint8_t*)0x200003aa = 0x2c;
  *(uint8_t*)0x200003ab = 0;
  syz_mount_image(0x20000080, 0x200000c0, 0x8100000, 2, 0x20000300, 0x180c082,
                  0x20000340, 1);
  return 0;
}