// https://syzkaller.appspot.com/bug?id=6605237fdbccd96ca99c9feba4430500abdc77ec
// 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
#ifndef __NR_pwritev2
#define __NR_pwritev2 328
#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;
}

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

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);
  intptr_t res = 0;
  memcpy((void*)0x20000000, "reiserfs\000", 9);
  memcpy((void*)0x20000100, "./file0\000", 8);
  *(uint64_t*)0x20000540 = 0x20000140;
  memcpy((void*)0x20000140, "\x8c\xb6\x37", 3);
  *(uint64_t*)0x20000548 = 3;
  *(uint64_t*)0x20000550 = 1;
  *(uint64_t*)0x20000558 = 0x20000600;
  memcpy((void*)0x20000600, "\x00\x84\x09", 3);
  *(uint64_t*)0x20000560 = 3;
  *(uint64_t*)0x20000568 = 4;
  *(uint64_t*)0x20000570 = 0x200003c0;
  memcpy(
      (void*)0x200003c0,
      "\xcf\x58\xf9\xb6\xb0\x97\x28\x72\x18\xce\x56\xf2\x50\xb4\x26\xfd\x15\x34"
      "\xa8\x24\x13\x97\xcf\xab\x6d\x88\x16\xfa\x4b\xb4\x5c\x3f\x9f\xdd\xf8\x76"
      "\xb2\x69\xc1\xe8\x59\xce\xbe\x21\xb7\xd9\x24\x4b\x1f\xd8\xf4\x11\xc2\xe7"
      "\x5b\x40\x44\x0e\x6e\x93\x65\x6e\xcb\xb4\x9b\xee\xac\x1c\x75\x71\x47\x8c"
      "\xa3\xc9\x9e\xc9\x07\x4a\xeb\xad\xf4\x46\x2d\x55\x73\x8c\xec\xdf\x1a\xe2"
      "\x86\x2f\x84\x19\x26\xf1\x5b\x27\x70\x6d\xc5\xf5\x8b\x7a\x97\xed\xdb\x38"
      "\x5d\x14\xcb\x9c\x8a\xc2\x40\x14\x98\x49\x6f\xac\x00\x4e\x57\x41\x17\x8f"
      "\x6b\x0d\x2f\xd5\x0e\x23\x2c\xd6\xf6\x69\x95\x25\x9a\x8c\x57\x3a\x6b\xc6"
      "\xad\x4f\x95\x0f\xf4\x07\xdf\x67\xc0\xd0\x0e\xfb\xe7\xbf\x66\xea\xce\xf1"
      "\x43\x9b\x60\xe4\xdb\xf2\x4b\x6e\xed\x04\x20\x2c\x85\x42\xf1\x1f\x3f\x66"
      "\x65\x80\x5e\xac\x43\xe3\x13\xd1\x3f\xaf\x64\x88\xa3\x74\xe9\x55\xb4\xe0"
      "\xd4\x6b\x82\xb2\x44\x01\xac",
      205);
  *(uint64_t*)0x20000578 = 0xcd;
  *(uint64_t*)0x20000580 = 7;
  *(uint64_t*)0x20000588 = 0x20010000;
  memcpy((void*)0x20010000,
         "\x00\x04\x00\x00\xec\x01\x00\x00\x13\x02\x00\x00\x12\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x61\x1c\xad\x49\xe1\x00"
         "\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x10\xcc\x03\x10\x00\x01"
         "\x00\x52\x65\x49\x73\x45\x72\x33\x46\x73\x00\x00\x00\x02\x00\x00\x00"
         "\x02\x00\x01\x00\x02\x00\x01\x02\x00\x00\x00\x00\x01\x00\x00\x00\x12"
         "\x31\x2a\x23\x12\x12\x33\x12\x33\x12\x31\x12\x34\x13\x41\x24\x12\x73"
         "\x79\x7a\x6b\x61\x6c\x6c\x65\x72\x00\x00\x00\x00\x00\x00\x00\x01\x00"
         "\x1e\x00\x3a\xc1\x65\x5f\x00\x4e\xed",
         128);
  *(uint64_t*)0x20000590 = 0x80;
  *(uint64_t*)0x20000598 = 0x10000;
  *(uint64_t*)0x200005a0 = 0x20000040;
  memcpy((void*)0x20000040,
         "\x00\x00\x00\x00\x00\x00\x05\x00\x08\x00\x00\x00\x01\x10\x00\x00\x03"
         "\x10\x00\x48\xb2\x56\x07\x81\x8b\x96\xe2\x7e\xa5\x80\x19\x56\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x9e\x08",
         45);
  *(uint64_t*)0x200005a8 = 0x2d;
  *(uint64_t*)0x200005b0 = 0x100c0;
  *(uint64_t*)0x200005b8 = 0x20001a00;
  memcpy((void*)0x20001a00,
         "\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x12\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x61\x1c\xad\x49\xe1\x00"
         "\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf4\x50\x98\x12"
         "\x2a\x16\x2b\x00\x17\x31\xda\x04\x98\x0e\x00\x00\x66\xd9\xca\x9b\x08"
         "\x8f\x7a\xfe\xe7\x42\xa2\xaa\xc9\x3d\x10\x58\x68\xc7\x2e\xdb\x81\x4c"
         "\xc6\x6a\x9a\x15\x09\xf9\x0b\xd4\x13\xa2\xb6\x2d\xa4\x39\x9d\xeb\xc7"
         "\xfe\xcf\x87\xab\xdb\x53\x1e\x95\xf9\x2a\x62\xd9\x60\xae\x64\xfe\x76"
         "\x34\x4e\x25\x43\xf4\xe6\xfb\x0d\x51\x55\x05\x35\xcc\x7a\x26\x0a\x24"
         "\xc2\xf4\xef\xbd\xe4\x5c\x75\x51\x53\x41\x8c\xe7\xf3\x7b\x89\xcf\xa2"
         "\xdb\x01\x7f\xa7\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         185);
  *(uint64_t*)0x200005c0 = 0xb9;
  *(uint64_t*)0x200005c8 = 0x212000;
  *(uint64_t*)0x200005d0 = 0x20011300;
  memcpy((void*)0x20011300,
         "\x01\x00\x02\x00\x5c\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x2c\x00\xd4\x0f\x01\x00\x01\x00\x00"
         "\x00\x02\x00\x00\x00\x01\x00\x00\x00\xf4\x01\x00\x00\x02\x00\x30\x00"
         "\xa4\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         96);
  *(uint64_t*)0x200005d8 = 0x60;
  *(uint64_t*)0x200005e0 = 0x213000;
  *(uint64_t*)0x200005e8 = 0x20000280;
  memcpy((void*)0x20000280,
         "\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x28"
         "\x00\x04\x00\x02\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x20\x00"
         "\x04\x00\x2e\x2e\x00\x00\x00\x00\x00\x00\x2e\x00\xe2\xff\x00\x00\x00"
         "\x00\xed\x41\x00\x00\x03\x00\x00\x3a\xc1\x65\x5f\x3a\xc1\x65\x5f\x3a"
         "\xc1\x65\xea\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf3\xff",
         82);
  *(uint64_t*)0x200005f0 = 0x52;
  *(uint64_t*)0x200005f8 = 0x213fa0;
  *(uint64_t*)0x20000180 = 0;
  res = -1;
  res = syz_mount_image(0x20000000, 0x20000100, 0x400010, 8, 0x20000540,
                        0x20040a, 0x20000180, 0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000000, ".\000", 2);
  res = syscall(__NR_open, 0x20000000ul, 0ul, 0ul);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20000080 = 0x31;
  *(uint64_t*)0x20000088 = 0;
  *(uint64_t*)0x20000090 = 0;
  *(uint64_t*)0x20000098 = 0;
  *(uint32_t*)0x200000a0 = 0;
  *(uint16_t*)0x200000a4 = 0;
  *(uint16_t*)0x200000a6 = 0;
  syscall(__NR_ioctl, r[1], 0x40286608, 0x20000080ul);
  syscall(__NR_pwritev2, -1, 0ul, 0ul, 0x35e, 3, 4ul);
  *(uint64_t*)0x20000080 = 5;
  syscall(__NR_ioctl, r[0], 0x40087602, 0x20000080ul);
  return 0;
}