// https://syzkaller.appspot.com/bug?id=050d9b36a89f3bc42efe47dd9558faee19e8469d
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <stdbool.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 319
#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)
    return 0;
  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) {
    bool has_remount_ro = false;
    char* remount_ro_start = strstr(opts, "errors=remount-ro");
    if (remount_ro_start != NULL) {
      char after = *(remount_ro_start + strlen("errors=remount-ro"));
      char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1);
      has_remount_ro = ((before == '\0' || before == ',') &&
                        (after == '\0' || after == ','));
    }
    if (strstr(opts, "errors=panic") || !has_remount_ro)
      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;
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  intptr_t res = 0;
  memcpy((void*)0x20000c00, "udf\000", 4);
  memcpy((void*)0x20000200, "./file0\000", 8);
  memcpy(
      (void*)0x20002440,
      "\x78\x9c\xec\xdd\x41\x6c\x1c\xd7\x7d\x07\xe0\xff\x1b\x2d\x45\x4a\x6e\x2b"
      "\x26\x4e\x54\xbb\x8d\x8b\x4d\x5b\xa4\x32\x63\xb9\xb2\xa4\x98\x8a\x55\xb8"
      "\xab\x9a\x66\x1b\x40\x96\x89\x50\xcc\x2d\x00\x57\xe4\x4a\x5d\x98\x22\x09"
      "\x92\x6a\x64\x23\x6d\x99\x5e\x7a\xe8\x21\x40\x51\xf4\x90\x13\x81\xd6\x28"
      "\x90\xa2\x81\xd1\x14\x41\x8f\x6c\xeb\x02\xc9\xc5\x87\x22\xa7\x9e\x88\x16"
      "\x36\x82\xa2\x07\xb6\x08\x90\x93\xc1\x60\x66\xdf\x8a\x4b\x8a\xb2\x64\x53"
      "\xa4\x48\xfb\xfb\x6c\xea\x37\x3b\xfb\xde\xec\x7b\x6f\xd6\x33\xb2\xa0\x37"
      "\x2f\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\x00\x00\x00\x00\x80\x88\xdf\x7b"
      "\xf9\xd2\x99\xe7\xd2\xa3\x6e\x05\x00\xb0\x9f\xae\x8c\x7f\xf5\xcc\x59\xf7"
      "\x7f\x00\xf8\x44\xb9\xea\xff\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\xe0\xa0\x4b\x51\xc4\xe3\x91\x62\xfe\xca\x7a\x9a\xac\x5e\x77\x0c\x5c"
      "\x6e\xcf\xde\xba\x3d\x31\x32\xba\x73\xb5\x63\xa9\xaa\x79\xa4\x2a\x5f\xfe"
      "\x0c\x3c\x77\xf6\xdc\xf9\x2f\x3d\x3f\x7c\xa1\x9b\x1f\x5c\xff\x61\x7b\x32"
      "\x5e\x1d\xbf\x7a\xa9\xfe\xd2\xdc\xcd\xf9\x85\xd6\xe2\x62\x6b\xba\x3e\x31"
      "\xdb\x9e\x9a\x9b\x6e\x3d\xf0\x11\x76\x5b\x7f\xbb\xa1\x6a\x00\xea\x37\x5f"
      "\xbb\x35\x7d\xfd\xfa\x62\xfd\xec\xb3\xe7\xb6\xbc\x7d\x7b\xf0\xbd\xfe\xc7"
      "\x4e\x0e\x5e\x1c\x7e\xfa\xf4\x53\xdd\xb2\x13\x23\xa3\xa3\xe3\x3d\x65\x6a"
      "\x7d\x1f\xf9\xd3\xef\x72\xaf\x19\x1e\x47\xa3\x88\xd3\x91\xe2\x99\xef\xfd"
      "\x24\x35\x23\xa2\x88\xdd\x8f\xc5\x7d\xbe\x3b\x7b\xed\x58\xd5\x89\xa1\xaa"
      "\x13\x13\x23\xa3\x55\x47\x66\xda\xcd\xd9\xa5\xf2\xcd\xb1\xee\x40\x14\x11"
      "\xf5\x9e\x4a\x8d\xee\x18\xed\xc3\xb9\xd8\x95\x46\xc4\x72\xd9\xfc\xb2\xc1"
      "\x43\x65\xf7\xc6\xe7\x9b\x0b\xcd\x6b\x33\xad\xfa\x58\x73\x61\xa9\xbd\xd4"
      "\x9e\x9b\x1d\x4b\x9d\xd6\x96\xfd\xa9\x47\x11\x17\x52\xc4\x4a\x44\xac\xf5"
      "\xdf\x7d\xb8\xbe\x28\xa2\x16\x29\xbe\x73\x62\x3d\x5d\x8b\x88\x23\xdd\x71"
      "\xf8\x62\x35\x31\xf8\xde\xed\x28\xf6\xb0\x8f\x0f\xa0\x6c\x67\xbd\x2f\x62"
      "\xa5\x38\x04\xe7\xec\x00\xeb\x8f\x22\x5e\x89\x14\x3f\x7d\xbb\x88\xa9\x72"
      "\xcc\xf2\x4f\x7c\x21\xe2\x95\x32\x7f\x10\xf1\x66\x99\x2f\x46\xa4\xf2\x8b"
      "\x71\x3e\xe2\xdd\x1d\xbe\x47\x1c\x4e\xb5\x28\xe2\x2f\xca\xf3\x7f\x71\x3d"
      "\x4d\x57\xd7\x83\xee\x75\xe5\xf2\xd7\xea\x5f\x99\xbd\x3e\xd7\x53\xb6\x7b"
      "\x5d\x39\xf4\xf7\x87\xfd\x74\xc0\xaf\x4d\x03\x51\x44\xb3\xba\xe2\xaf\xa7"
      "\x8f\xfe\x9b\x1d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1e"
      "\xb6\x63\x51\xc4\x93\x91\xe2\xe5\xff\xf8\xa3\x6a\x5e\x71\x54\xf3\xd2\x4f"
      "\x5c\x1c\xfe\xfd\xc1\x5f\xec\x9d\x33\xfe\xc4\x7d\x8e\x53\x96\x7d\x36\x22"
      "\x96\x8b\x07\x9b\x93\x7b\x34\x4f\x21\x1e\x4b\x63\x29\x3d\xe2\xb9\xc4\x9f"
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      "\x72\x46\x2d\xd7\xcf\xd9\xc8\x39\x99\x73\x39\xe7\x4a\xce\xd5\x9c\x6b\x39"
      "\xe3\x80\xcc\xdd\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x3e\x5e\x8a\xea\x9f\x14\xdf\xfe\xc6\x7a\xda\xe8\xef\xac\x2f\x3d\x19"
      "\x9d\x5c\xb5\x1e\xe8\xc7\xde\xcf\x03\x00\x00\xff\xff\x5a\x72\xfd\x09",
      3095);
  syz_mount_image(/*fs=*/0x20000c00, /*dir=*/0x20000200, /*flags=*/0x14444,
                  /*opts=*/0x20000240, /*chdir=*/1, /*size=*/0xc17,
                  /*img=*/0x20002440);
  memcpy((void*)0x20000000, "./bus\000", 6);
  res = syscall(__NR_open, /*file=*/0x20000000ul, /*flags=*/0x60142ul,
                /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20007f80, "./bus\000", 6);
  res = syscall(__NR_open, /*file=*/0x20007f80ul, /*flags=*/0ul, /*mode=*/0ul);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x200000c0, "./bus\000", 6);
  res = syscall(__NR_creat, /*file=*/0x200000c0ul, /*mode=*/0ul);
  if (res != -1)
    r[2] = res;
  syscall(__NR_lseek, /*fd=*/r[2], /*offset=*/0x7ffffcul, /*whence=*/0ul);
  syscall(__NR_write, /*fd=*/r[2], /*data=*/0x20000080ul, /*len=*/0xfd14ul);
  syscall(__NR_sendfile, /*fdout=*/r[0], /*fdin=*/r[1], /*off=*/0ul,
          /*count=*/0x1000000201005ul);
  return 0;
}