// https://syzkaller.appspot.com/bug?id=c2fd07ae5213991a1b95eadee9205b41ac1aa6e2
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.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 279
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif

static unsigned long long procid;

//% This code is derived from puff.{c,h}, found in the zlib development. The
//% original files come with the following copyright notice:

//% Copyright (C) 2002-2013 Mark Adler, all rights reserved
//% version 2.3, 21 Jan 2013
//% This software is provided 'as-is', without any express or implied
//% warranty.  In no event will the author be held liable for any damages
//% arising from the use of this software.
//% Permission is granted to anyone to use this software for any purpose,
//% including commercial applications, and to alter it and redistribute it
//% freely, subject to the following restrictions:
//% 1. The origin of this software must not be misrepresented; you must not
//%    claim that you wrote the original software. If you use this software
//%    in a product, an acknowledgment in the product documentation would be
//%    appreciated but is not required.
//% 2. Altered source versions must be plainly marked as such, and must not be
//%    misrepresented as being the original software.
//% 3. This notice may not be removed or altered from any source distribution.
//% Mark Adler    madler@alumni.caltech.edu

//% BEGIN CODE DERIVED FROM puff.{c,h}

#define MAXBITS 15
#define MAXLCODES 286
#define MAXDCODES 30
#define MAXCODES (MAXLCODES + MAXDCODES)
#define FIXLCODES 288

struct puff_state {
  unsigned char* out;
  unsigned long outlen;
  unsigned long outcnt;
  const unsigned char* in;
  unsigned long inlen;
  unsigned long incnt;
  int bitbuf;
  int bitcnt;
  jmp_buf env;
};
static int puff_bits(struct puff_state* s, int need)
{
  long val = s->bitbuf;
  while (s->bitcnt < need) {
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    val |= (long)(s->in[s->incnt++]) << s->bitcnt;
    s->bitcnt += 8;
  }
  s->bitbuf = (int)(val >> need);
  s->bitcnt -= need;
  return (int)(val & ((1L << need) - 1));
}
static int puff_stored(struct puff_state* s)
{
  s->bitbuf = 0;
  s->bitcnt = 0;
  if (s->incnt + 4 > s->inlen)
    return 2;
  unsigned len = s->in[s->incnt++];
  len |= s->in[s->incnt++] << 8;
  if (s->in[s->incnt++] != (~len & 0xff) ||
      s->in[s->incnt++] != ((~len >> 8) & 0xff))
    return -2;
  if (s->incnt + len > s->inlen)
    return 2;
  if (s->outcnt + len > s->outlen)
    return 1;
  for (; len--; s->outcnt++, s->incnt++) {
    if (s->in[s->incnt])
      s->out[s->outcnt] = s->in[s->incnt];
  }
  return 0;
}
struct puff_huffman {
  short* count;
  short* symbol;
};
static int puff_decode(struct puff_state* s, const struct puff_huffman* h)
{
  int first = 0;
  int index = 0;
  int bitbuf = s->bitbuf;
  int left = s->bitcnt;
  int code = first = index = 0;
  int len = 1;
  short* next = h->count + 1;
  while (1) {
    while (left--) {
      code |= bitbuf & 1;
      bitbuf >>= 1;
      int count = *next++;
      if (code - count < first) {
        s->bitbuf = bitbuf;
        s->bitcnt = (s->bitcnt - len) & 7;
        return h->symbol[index + (code - first)];
      }
      index += count;
      first += count;
      first <<= 1;
      code <<= 1;
      len++;
    }
    left = (MAXBITS + 1) - len;
    if (left == 0)
      break;
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    bitbuf = s->in[s->incnt++];
    if (left > 8)
      left = 8;
  }
  return -10;
}
static int puff_construct(struct puff_huffman* h, const short* length, int n)
{
  int len;
  for (len = 0; len <= MAXBITS; len++)
    h->count[len] = 0;
  int symbol;
  for (symbol = 0; symbol < n; symbol++)
    (h->count[length[symbol]])++;
  if (h->count[0] == n)
    return 0;
  int left = 1;
  for (len = 1; len <= MAXBITS; len++) {
    left <<= 1;
    left -= h->count[len];
    if (left < 0)
      return left;
  }
  short offs[MAXBITS + 1];
  offs[1] = 0;
  for (len = 1; len < MAXBITS; len++)
    offs[len + 1] = offs[len] + h->count[len];
  for (symbol = 0; symbol < n; symbol++)
    if (length[symbol] != 0)
      h->symbol[offs[length[symbol]]++] = symbol;
  return left;
}
static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode,
                      const struct puff_huffman* distcode)
{
  static const short lens[29] = {3,  4,  5,  6,   7,   8,   9,   10,  11, 13,
                                 15, 17, 19, 23,  27,  31,  35,  43,  51, 59,
                                 67, 83, 99, 115, 131, 163, 195, 227, 258};
  static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
                                 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
  static const short dists[30] = {
      1,    2,    3,    4,    5,    7,    9,    13,    17,    25,
      33,   49,   65,   97,   129,  193,  257,  385,   513,   769,
      1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
  static const short dext[30] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
                                 4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
                                 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
  int symbol;
  do {
    symbol = puff_decode(s, lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 256) {
      if (s->outcnt == s->outlen)
        return 1;
      if (symbol)
        s->out[s->outcnt] = symbol;
      s->outcnt++;
    } else if (symbol > 256) {
      symbol -= 257;
      if (symbol >= 29)
        return -10;
      int len = lens[symbol] + puff_bits(s, lext[symbol]);
      symbol = puff_decode(s, distcode);
      if (symbol < 0)
        return symbol;
      unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]);
      if (dist > s->outcnt)
        return -11;
      if (s->outcnt + len > s->outlen)
        return 1;
      while (len--) {
        if (dist <= s->outcnt && s->out[s->outcnt - dist])
          s->out[s->outcnt] = s->out[s->outcnt - dist];
        s->outcnt++;
      }
    }
  } while (symbol != 256);
  return 0;
}
static int puff_fixed(struct puff_state* s)
{
  static int virgin = 1;
  static short lencnt[MAXBITS + 1], lensym[FIXLCODES];
  static short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  static struct puff_huffman lencode, distcode;
  if (virgin) {
    lencode.count = lencnt;
    lencode.symbol = lensym;
    distcode.count = distcnt;
    distcode.symbol = distsym;
    short lengths[FIXLCODES];
    int symbol;
    for (symbol = 0; symbol < 144; symbol++)
      lengths[symbol] = 8;
    for (; symbol < 256; symbol++)
      lengths[symbol] = 9;
    for (; symbol < 280; symbol++)
      lengths[symbol] = 7;
    for (; symbol < FIXLCODES; symbol++)
      lengths[symbol] = 8;
    puff_construct(&lencode, lengths, FIXLCODES);
    for (symbol = 0; symbol < MAXDCODES; symbol++)
      lengths[symbol] = 5;
    puff_construct(&distcode, lengths, MAXDCODES);
    virgin = 0;
  }
  return puff_codes(s, &lencode, &distcode);
}
static int puff_dynamic(struct puff_state* s)
{
  static const short order[19] = {16, 17, 18, 0, 8,  7, 9,  6, 10, 5,
                                  11, 4,  12, 3, 13, 2, 14, 1, 15};
  int nlen = puff_bits(s, 5) + 257;
  int ndist = puff_bits(s, 5) + 1;
  int ncode = puff_bits(s, 4) + 4;
  if (nlen > MAXLCODES || ndist > MAXDCODES)
    return -3;
  short lengths[MAXCODES];
  int index;
  for (index = 0; index < ncode; index++)
    lengths[order[index]] = puff_bits(s, 3);
  for (; index < 19; index++)
    lengths[order[index]] = 0;
  short lencnt[MAXBITS + 1], lensym[MAXLCODES];
  struct puff_huffman lencode = {lencnt, lensym};
  int err = puff_construct(&lencode, lengths, 19);
  if (err != 0)
    return -4;
  index = 0;
  while (index < nlen + ndist) {
    int symbol;
    int len;
    symbol = puff_decode(s, &lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 16)
      lengths[index++] = symbol;
    else {
      len = 0;
      if (symbol == 16) {
        if (index == 0)
          return -5;
        len = lengths[index - 1];
        symbol = 3 + puff_bits(s, 2);
      } else if (symbol == 17)
        symbol = 3 + puff_bits(s, 3);
      else
        symbol = 11 + puff_bits(s, 7);
      if (index + symbol > nlen + ndist)
        return -6;
      while (symbol--)
        lengths[index++] = len;
    }
  }
  if (lengths[256] == 0)
    return -9;
  err = puff_construct(&lencode, lengths, nlen);
  if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
    return -7;
  short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  struct puff_huffman distcode = {distcnt, distsym};
  err = puff_construct(&distcode, lengths + nlen, ndist);
  if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
    return -8;
  return puff_codes(s, &lencode, &distcode);
}
static int puff(unsigned char* dest, unsigned long* destlen,
                const unsigned char* source, unsigned long sourcelen)
{
  struct puff_state s = {
      .out = dest,
      .outlen = *destlen,
      .outcnt = 0,
      .in = source,
      .inlen = sourcelen,
      .incnt = 0,
      .bitbuf = 0,
      .bitcnt = 0,
  };
  int err;
  if (setjmp(s.env) != 0)
    err = 2;
  else {
    int last;
    do {
      last = puff_bits(&s, 1);
      int type = puff_bits(&s, 2);
      err = type == 0 ? puff_stored(&s)
                      : (type == 1 ? puff_fixed(&s)
                                   : (type == 2 ? puff_dynamic(&s) : -1));
      if (err != 0)
        break;
    } while (!last);
  }
  *destlen = s.outcnt;
  return err;
}

//% END CODE DERIVED FROM puff.{c,h}

#define ZLIB_HEADER_WIDTH 2

static int puff_zlib_to_file(const unsigned char* source,
                             unsigned long sourcelen, int dest_fd)
{
  if (sourcelen < ZLIB_HEADER_WIDTH) {
    errno = EMSGSIZE;
    return -1;
  }
  source += ZLIB_HEADER_WIDTH;
  sourcelen -= ZLIB_HEADER_WIDTH;
  const unsigned long max_destlen = 132 << 20;
  void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ,
                   MAP_PRIVATE | MAP_ANON, -1, 0);
  if (ret == MAP_FAILED)
    return -1;
  unsigned char* dest = (unsigned char*)ret;
  unsigned long destlen = max_destlen;
  int err = puff(dest, &destlen, source, sourcelen);
  if (err) {
    munmap(dest, max_destlen);
    errno = -err;
    return -1;
  }
  if (write(dest_fd, dest, destlen) != (ssize_t)destlen) {
    munmap(dest, max_destlen);
    return -1;
  }
  return munmap(dest, destlen);
}

static int setup_loop_device(unsigned char* data, unsigned long size,
                             const char* loopname, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (puff_zlib_to_file(data, size, memfd)) {
    err = errno;
    goto error_close_memfd;
  }
  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;
    }
  }
  close(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 long flags, volatile long optsarg,
                            volatile long change_dir,
                            volatile unsigned long size, volatile long image)
{
  unsigned char* data = (unsigned char*)image;
  int res = -1, err = 0, loopfd = -1, need_loop_device = !!size;
  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(data, size, loopname, &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);
  }
  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*)0x20000240, "hfs\000", 4);
  memcpy((void*)0x20000280, "./file0\000", 8);
  memcpy((void*)0x20000080,
         "\x63\x6f\x64\x65\x70\x61\x67\x65\x3d\x64\x65\x66\x61\x75\x6c\x74\x00"
         "\xde\x06\x2c\x4c\x5b\x34\x3d\x75\x53\x7e\x31\x10\x83\x31\xbc\xb9\xd7"
         "\x30\xfa\x94\xf2\x50\x49\xb6\xdb\x9e\x70\x9c\x93\xe2\x3d\xe7\x63\xa8"
         "\xdf\xd5\x30\x48\x05\x06\x18\x95\x4a\xf8\x5a\x74\x7e\x44\x46\x69\x5e"
         "\x36\x46\x13\x8b\x5b\x6e\x83\x7e\x54\xc1\xf1\x9e\x3d\x9d\x72\x00\x93"
         "\x8a\xd0\x83\xed\x53\xc6\xd6\xea\xeb\xc1\x69\x95\x69\x0f\xdf\x16\xa1"
         "\x44\x8e\x9d\x41\x56\x7b\xfe\x6d\xac\x05\x2d\xe0\x26\x78\x8c\xcc\xa4"
         "\x8e\x79\xc6\x75\xd5\x98\xb4\x66\xa0\x73\xac\x72\x6a\x1d\xd6\xcf\xe1"
         "\x68\x94\x04\x38\xeb\x4f\x76\x02\xf1\xf0\x55\xd3\xf4\xe2",
         150);
  memcpy(
      (void*)0x20000680,
      "\x78\x9c\xec\xdd\xcd\x6e\xd3\x4c\x14\xc6\xf1\x67\x26\xe9\x9b\xbc\xb4\x2a"
      "\xee\x07\xaa\xc4\xb2\x50\x89\x15\x6a\xcb\x06\xb1\x41\x42\xb9\x08\x16\x08"
      "\x01\x4d\x90\x2a\xa2\x22\x41\x91\x80\x0d\x88\x35\xe2\x02\xd8\x73\x0b\xac"
      "\x59\xb3\x42\xdc\x00\xac\x58\x71\x01\xd9\x19\xcd\x78\xda\x38\x1f\xb6\x9b"
      "\xa2\x64\x68\xfa\xff\x49\x71\xdd\x78\xc6\x73\x4e\x6d\xc7\x73\x22\x55\x16"
      "\x80\x73\xeb\x4e\xeb\xc7\xa7\x1b\xbf\xdc\xcb\x48\x35\xd5\x24\xdd\x92\xac"
      "\xa4\xa6\x54\x97\x74\x49\x1b\xcd\x17\x07\x87\xfb\x87\xdd\x4e\xbb\x6c\x47"
      "\x35\xdf\xc3\xbd\x8c\xb2\x9e\x66\xa4\xcd\xde\x41\x67\xb4\xa3\xcd\x7e\xd4"
      "\xfb\xef\x24\xee\xb7\xba\x96\xf2\xef\x61\x3a\xd2\x34\x4d\x7f\xc6\x0e\x02"
      "\xd1\xf9\xab\x7f\x0c\x2b\x35\xc2\xd5\xe9\xb7\x37\x67\x1e\xd9\x74\xbc\x8d"
      "\x1d\x40\x64\xa6\xa7\x9e\x5e\x6a\x39\x76\x1c\x00\x80\xb8\xc2\xfd\xdf\x86"
      "\xfb\xfc\x52\x98\xbf\x5b\x2b\x6d\x85\xdb\xfe\x5c\xdd\xff\x7b\xb1\x03\x88"
      "\x2c\x77\xff\xf7\x55\x56\x6a\xdc\xf1\xbd\xe8\x37\xf5\xeb\x3d\x5f\xc2\xb9"
      "\xed\xf6\xa8\x4a\x3c\xcd\x58\xff\x29\x3b\xb3\x06\x26\x98\xa6\xaa\xaa\xf4"
      "\xb1\xd8\xff\x1f\xef\x77\x3b\xd7\xf7\x9e\x76\xdb\x56\xef\x74\x3b\xc8\x35"
      "\x5b\xf7\xcb\xf6\x71\x1d\xe9\x55\x44\xbb\x39\xa6\x36\x2d\x71\xfa\xdc\x17"
      "\x7d\x0e\x0b\x2e\x87\xdd\x82\xf8\xd7\x2a\x46\x4c\x33\x6f\x26\x1f\xbc\x80"
      "\xf9\x6a\xbe\x99\xfb\x26\xd1\x47\xb5\x8f\xe7\x7f\xf5\xd4\xb8\xc3\xe4\x8f"
      "\x54\x32\x74\xa4\xb2\xf8\xb7\x8b\xf7\xe8\xb3\x4c\xb2\x56\x05\x59\xae\xf8"
      "\x41\x2e\x87\x11\x46\xb3\x1c\xa7\x39\xbe\x22\xd1\xd1\x19\xb5\xa2\xc1\x2f"
      "\x08\x92\xaa\x38\x7d\xaf\xd5\xa1\x5e\x59\x76\x3b\x15\xbd\xd6\xc6\xf6\xda"
      "\xad\xe8\xb5\x3e\xdc\xab\x7f\x36\x17\xf7\x9c\x36\xf3\xc1\xdc\x35\x9b\xfa"
      "\xad\xcf\x6a\xe5\xe6\xff\xd6\xfd\xb5\xb7\x74\x92\x2b\xd3\xb5\xf1\x2d\xc3"
      "\x99\x51\x9a\x4f\xdd\xb7\x4c\x4e\x10\x98\x9d\x28\x0d\xfc\x9d\xf7\x7a\xa4"
      "\x9b\x5a\x7e\xfe\xea\xf5\x93\x87\xdd\x6e\xe7\x19\x2b\xe7\x7e\x65\x21\x9c"
      "\x1a\xff\x4a\x3c\xac\x94\xac\xd4\xd4\xd0\x54\x87\x18\xfa\xbc\xe0\xd3\x79"
      "\x2e\xf5\x0f\xba\x36\xee\xc5\x0e\x06\x31\xb8\x2b\xdb\x64\xf5\x5f\xae\x5e"
      "\xd9\xf6\x25\x92\x5b\x24\x25\xf3\xf4\xb4\x6a\xe7\xb9\x3d\xee\x14\xd4\x06"
      "\xab\x7e\x79\x61\xa2\x0a\x6e\xb1\xb8\x82\xcb\xd7\x5c\x8d\x92\x9a\xeb\xca"
      "\x35\xe9\xea\xc0\x88\x5f\x1a\x25\x23\x26\x21\xce\x39\x61\x5a\xfa\xae\x07"
      "\x7c\xff\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x70"
      "\xd6\xcc\xe2\x3f\x16\x62\xe7\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x00\x00\x00\x00\x00\xc0\x59\x17\xff\xf9\xbf\xe1\x99\x62\x3c\xff\x17"
      "\x98\xb9\x3f\x01\x00\x00\xff\xff\x6c\x1f\x84\x81",
      606);
  syz_mount_image(0x20000240, 0x20000280, 3, 0x20000080, 3, 0x25e, 0x20000680);
  return 0;
}