// https://syzkaller.appspot.com/bug?id=aed20a1748cce614db82f1776b66e16dafe2fc99
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.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/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/loop.h>

#ifndef __NR_chdir
#define __NR_chdir 49
#endif
#ifndef __NR_memfd_create
#define __NR_memfd_create 279
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

//% 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, max_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 void reset_loop_device(const char* loopname)
{
  int loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    return;
  }
  if (ioctl(loopfd, LOOP_CLR_FD, 0)) {
  }
  close(loopfd);
}

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, 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) {
    int loopfd;
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(data, size, loopname, &loopfd) == -1)
      return -1;
    close(loopfd);
    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");
  } else if (strncmp(fs, "gfs2", 4) == 0 &&
             (strstr(opts, "errors=panic") || strstr(opts, "debug"))) {
    strcat(opts, ",errors=withdraw");
  }
  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)
    reset_loop_device(loopname);
  errno = err;
  return res;
}

static void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  if (getppid() == 1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  sandbox_common_mount_tmpfs();
  loop();
  exit(1);
}

void loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  syz_mount_image$hfs arguments: [
  //    fs: ptr[in, buffer] {
  //      buffer: {68 66 73 00} (length 0x4)
  //    }
  //    dir: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
  //    }
  //    flags: mount_flags = 0x3000cc0 (8 bytes)
  //    opts: ptr[inout, array[ANYUNION]] {
  //      array[ANYUNION] {
  //        union ANYUNION {
  //          ANYBLOB: buffer: {66 69 6c 65 5f 75 6d 61 73 6b 3d 30 30 30 30 30
  //          30 30 30 30 30 30 30 30 30 30 30 30 30 30 37 37 37 37 2c 64 69 72
  //          5f 75 6d 61 73 6b 3d 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
  //          30 30 30 30 30 30 30 30 2c 69 6f 63 68 61 72 73 65 74 3d 69 73 6f
  //          38 38 35 39 2d 36 2c 63 6f 64 65 70 61 67 65 3d 63 70 38 35 35 2c
  //          63 72 65 61 74 6f 72 3d 4d dd 71 75 2c 00 ee ab c7 2a 98 32 43 69
  //          50 c6 11 64 98 dd a8 be 60 a9 47 46 ea 68 76 6f 63 d1 d6 39 44 fb
  //          da 2a 93 37 43 9b 37 b6 f2 a6 94 ba 98 f4 00 70 d0 9c 38 90 bd 28
  //          a2 01 8f 1a df e1 e0 a6 30 02 0a 9c ac 1a 43 80 0a 70 a9 32 8d db
  //          2a 2f 2e 20 7d a7 cd 3c af 24 3b 39 ea ff 49 66 b7 aa 97 cb 6c c7
  //          d2 cf c5 9e 7a 97 6d e0 a0 0d 23 c7 ff aa a0 56 cc 4f 8b c7 b4 c0
  //          f9 a2 1d b6 42 b3 e8 32 e3 0a 90 ba 1b 9e 79 33 b7 7c 60 f6 a1 b9
  //          ca 91 28 f0 a2 d0 e2 33 73 c9 d1 5c 79 86 5b ae 97 dd d8 2b 98 00
  //          1b 6a a9 c5 39 0e 4d ea f5 f0 ee 49 2c 68 42 b1 c0 84 86 e4 79 a8
  //          89 49 14 59 a2 57 e9 d4 08 36 34 da c6 cd 58 52 0f 72 e6 c2 f1 1b
  //          bd 5b 03 65 5b b1 86 3b 16 f3} (length 0x14e)
  //        }
  //        union ANYUNION {
  //          ANYBLOB: buffer: {c6 59 66 3a df bd 1f 44 cf 6a 67 b8 2d 06 dc 05
  //          d4 66 a6 fb 81 47 2d 26 e2 e3 64 4c c5 df 15 81 5d 59 e0 3c 5a af
  //          54 31 c4 04 e5 79 25 81 0a 1f 22 c1 1f 72 a6 2d 86 7f 81 0f 9e 37
  //          0f 1f b7 b1 b1 5e c0 91 20 f2 20 9f 71 c6 8f 81 5a 19 2b 66 45 47
  //          8d 80 d9 9e f0 1f a3 db a5 48 ae dc 91 ac 46 1c 32 b6 8d 39 79 a2
  //          bd d5 79 eb ab ae b1 cc fe 45 a3 bf ea 3b 31 14 08 5e b7 20 4d b5
  //          c8 83 d7 77 8e 00 e6 50 e4 b0 68 94 90 6e f0 01 86 81 b6 89 e7 cc
  //          38 dc 77 39 b3 34 69 cc 9f c4 8e 83 3d 21 60 dd 64 45 52 ae 15 bc
  //          43 99 c2 6e 03 99 46 77 8e db 20 2a 7d 39 31 48 7b a4 b8 2a ed 88
  //          21 6b e0 c9 b7 13 03 38 ea e1 67 16 5e 03 00 e2 93 67 ef 72 10 ff
  //          08 8a 8e 96 6c} (length 0xdb)
  //        }
  //        union ANYUNION {
  //          ANYRESHEX: ANYRES64 (resource)
  //        }
  //        union ANYUNION {
  //          ANYRES8: ANYRES8 (resource)
  //        }
  //      }
  //    }
  //    chdir: int8 = 0x11 (1 bytes)
  //    size: len = 0x30e (8 bytes)
  //    img: ptr[in, buffer] {
  //      buffer: (compressed buffer with length 0x30e)
  //    }
  //  ]
  //  returns fd_dir
  NONFAILING(memcpy((void*)0x200007c0, "hfs\000", 4));
  NONFAILING(memcpy((void*)0x20000740, "./file1\000", 8));
  NONFAILING(memcpy(
      (void*)0x20000800,
      "\x66\x69\x6c\x65\x5f\x75\x6d\x61\x73\x6b\x3d\x30\x30\x30\x30\x30\x30\x30"
      "\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x37\x37\x37\x37\x2c\x64"
      "\x69\x72\x5f\x75\x6d\x61\x73\x6b\x3d\x30\x30\x30\x30\x30\x30\x30\x30\x30"
      "\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x2c\x69\x6f\x63"
      "\x68\x61\x72\x73\x65\x74\x3d\x69\x73\x6f\x38\x38\x35\x39\x2d\x36\x2c\x63"
      "\x6f\x64\x65\x70\x61\x67\x65\x3d\x63\x70\x38\x35\x35\x2c\x63\x72\x65\x61"
      "\x74\x6f\x72\x3d\x4d\xdd\x71\x75\x2c\x00\xee\xab\xc7\x2a\x98\x32\x43\x69"
      "\x50\xc6\x11\x64\x98\xdd\xa8\xbe\x60\xa9\x47\x46\xea\x68\x76\x6f\x63\xd1"
      "\xd6\x39\x44\xfb\xda\x2a\x93\x37\x43\x9b\x37\xb6\xf2\xa6\x94\xba\x98\xf4"
      "\x00\x70\xd0\x9c\x38\x90\xbd\x28\xa2\x01\x8f\x1a\xdf\xe1\xe0\xa6\x30\x02"
      "\x0a\x9c\xac\x1a\x43\x80\x0a\x70\xa9\x32\x8d\xdb\x2a\x2f\x2e\x20\x7d\xa7"
      "\xcd\x3c\xaf\x24\x3b\x39\xea\xff\x49\x66\xb7\xaa\x97\xcb\x6c\xc7\xd2\xcf"
      "\xc5\x9e\x7a\x97\x6d\xe0\xa0\x0d\x23\xc7\xff\xaa\xa0\x56\xcc\x4f\x8b\xc7"
      "\xb4\xc0\xf9\xa2\x1d\xb6\x42\xb3\xe8\x32\xe3\x0a\x90\xba\x1b\x9e\x79\x33"
      "\xb7\x7c\x60\xf6\xa1\xb9\xca\x91\x28\xf0\xa2\xd0\xe2\x33\x73\xc9\xd1\x5c"
      "\x79\x86\x5b\xae\x97\xdd\xd8\x2b\x98\x00\x1b\x6a\xa9\xc5\x39\x0e\x4d\xea"
      "\xf5\xf0\xee\x49\x2c\x68\x42\xb1\xc0\x84\x86\xe4\x79\xa8\x89\x49\x14\x59"
      "\xa2\x57\xe9\xd4\x08\x36\x34\xda\xc6\xcd\x58\x52\x0f\x72\xe6\xc2\xf1\x1b"
      "\xbd\x5b\x03\x65\x5b\xb1\x86\x3b\x16\xf3",
      334));
  NONFAILING(memcpy(
      (void*)0x2000094e,
      "\xc6\x59\x66\x3a\xdf\xbd\x1f\x44\xcf\x6a\x67\xb8\x2d\x06\xdc\x05\xd4\x66"
      "\xa6\xfb\x81\x47\x2d\x26\xe2\xe3\x64\x4c\xc5\xdf\x15\x81\x5d\x59\xe0\x3c"
      "\x5a\xaf\x54\x31\xc4\x04\xe5\x79\x25\x81\x0a\x1f\x22\xc1\x1f\x72\xa6\x2d"
      "\x86\x7f\x81\x0f\x9e\x37\x0f\x1f\xb7\xb1\xb1\x5e\xc0\x91\x20\xf2\x20\x9f"
      "\x71\xc6\x8f\x81\x5a\x19\x2b\x66\x45\x47\x8d\x80\xd9\x9e\xf0\x1f\xa3\xdb"
      "\xa5\x48\xae\xdc\x91\xac\x46\x1c\x32\xb6\x8d\x39\x79\xa2\xbd\xd5\x79\xeb"
      "\xab\xae\xb1\xcc\xfe\x45\xa3\xbf\xea\x3b\x31\x14\x08\x5e\xb7\x20\x4d\xb5"
      "\xc8\x83\xd7\x77\x8e\x00\xe6\x50\xe4\xb0\x68\x94\x90\x6e\xf0\x01\x86\x81"
      "\xb6\x89\xe7\xcc\x38\xdc\x77\x39\xb3\x34\x69\xcc\x9f\xc4\x8e\x83\x3d\x21"
      "\x60\xdd\x64\x45\x52\xae\x15\xbc\x43\x99\xc2\x6e\x03\x99\x46\x77\x8e\xdb"
      "\x20\x2a\x7d\x39\x31\x48\x7b\xa4\xb8\x2a\xed\x88\x21\x6b\xe0\xc9\xb7\x13"
      "\x03\x38\xea\xe1\x67\x16\x5e\x03\x00\xe2\x93\x67\xef\x72\x10\xff\x08\x8a"
      "\x8e\x96\x6c",
      219));
  NONFAILING(sprintf((char*)0x20000a29, "0x%016llx", (long long)-1));
  NONFAILING(*(uint8_t*)0x20000a3b = -1);
  NONFAILING(memcpy(
      (void*)0x2001f6c0,
      "\x78\x9c\xec\xdd\x4d\x6b\x13\x4f\x1c\x07\xf0\xef\xec\xa6\x4d\xfa\x6f\xe9"
      "\x7f\xb5\x15\xc1\x83\x48\x35\x60\x2f\xa2\xf5\x22\x5e\x22\x25\x2f\xc2\x93"
      "\xa8\x4d\x0a\xc5\xa5\xa2\xb6\xf8\x80\x60\x15\x4f\x22\xf6\xee\xdd\xa3\x57"
      "\x5f\x83\x78\x51\x04\xcf\xf5\xe4\x49\x3c\xd7\x83\x8c\xcc\x43\xb2\xcf\x9b"
      "\xad\x76\x77\x13\xfc\x7e\xa0\x61\xb3\xb3\x33\xfb\x9b\xcc\xce\xce\x4c\xa0"
      "\x59\x10\xd1\x3f\x6b\xb5\xbb\xf7\xe6\xe2\x37\xf5\x27\x00\x17\x2e\xf0\xe2"
      "\x32\xe0\x00\x68\x01\x0d\x00\xc7\x70\xbc\xb5\xbd\xb9\xb5\xb1\xe5\xf7\x7b"
      "\x79\x05\xb9\x38\xd9\x34\xb9\x04\x4c\x4e\x91\x38\x66\x6d\xb3\x9f\x96\xb5"
      "\x05\x9b\xc3\xf2\xd4\xbb\x06\xe6\xc2\xfb\xa8\x1c\x52\xca\x2b\x5f\xeb\x0e"
      "\x82\x6a\xa7\x7b\xbf\x74\xa3\x3b\x4f\xe9\x3b\x41\xd3\xf6\x4e\x9d\xd8\xaa"
      "\x29\xbe\x2c\x4f\x0f\x9e\xe5\xc7\x0c\x80\x9d\x32\x82\x19\x2b\xf9\x2d\x25"
      "\xf6\xb1\x8f\x07\x98\xaf\x2c\x1c\x22\x22\x1a\x4b\xc2\x8c\xef\x8e\x1d\xe7"
      "\xe7\xec\xfc\xdd\x71\x80\xb6\x1d\x4c\xf4\x6c\x7c\xdc\xc6\xff\x3f\xb5\x5f"
      "\x77\x00\xa5\x93\xb9\xa9\xa1\xf1\x5f\xb7\xab\x14\xaa\xdd\xff\xd7\x49\xc1"
      "\x7a\x4f\x2f\xe1\x54\xba\x33\x58\x25\xa6\x95\xf5\x36\xf6\x7e\x2a\xf6\x7e"
      "\x1a\xe6\xca\x8a\xcc\x2e\xc5\xa8\x55\xa5\x8e\xc5\x99\x59\xdf\xf0\xfb\xe7"
      "\xd6\x6e\xfb\x3d\x07\xcf\xd0\xb1\x42\x87\x2d\xea\xd7\x9e\xb9\x74\x07\x22"
      "\xd1\x36\x13\x45\x2f\xa5\xac\x4d\x73\x0c\x4b\x9b\xc9\x3c\x44\xa4\xcf\x28"
      "\x67\x75\x1d\xa6\x54\x1d\x56\x4c\xfc\xf7\x01\x44\xe2\x5f\xc8\x3d\x63\x09"
      "\xc4\x07\xf1\x49\x5c\x13\x1e\x5e\xa3\x37\x9c\xff\x35\xa4\x50\xcd\xa4\x5b"
      "\xca\x8b\xb5\x94\x89\xff\x7c\x76\x89\xba\x96\x9e\x3a\x0a\xf6\xb6\xd1\xe9"
      "\x74\x9c\xc8\x21\x47\xf4\x49\x4e\xd8\x33\x58\x23\x6a\xd9\x82\x9b\x75\xc6"
      "\x69\x5b\x66\xe4\x0b\x02\x6f\x54\x9c\x3a\xd7\xd1\x58\x2e\x53\xbb\x0b\x23"
      "\x72\x2d\xa4\xe6\x5a\xd1\xdb\xcb\x70\x32\x72\x2d\x46\x72\xa9\xda\xac\x6f"
      "\xf8\xef\xb3\x4f\x55\x09\xf1\x4a\x5c\x15\x4b\xf8\x8e\x77\xe8\x86\xe6\xff"
      "\x8e\x8a\xaf\x8d\xdc\x9e\x19\xf4\x1a\xd1\x36\x43\x81\xfe\xc4\x55\xef\x8c"
      "\xb6\x6c\x48\xa3\x6d\xef\x44\x7a\xe4\xd8\xfe\xb2\xf7\xd8\xec\x4f\x76\x97"
      "\xe1\xa7\x98\xec\xb0\xd6\xcf\xfc\x7b\x1a\x1d\xc0\x4b\xdc\xc4\x25\xcc\xdf"
      "\x7b\xf8\xe8\x96\xeb\xfb\xfd\xbb\x6a\xe3\x86\xaf\x2e\x57\xbd\x31\xdc\x73"
      "\x67\xce\x6e\xf8\xfd\xa9\xe7\x40\x38\x69\x5c\x36\xb0\x13\xec\x69\x42\x6a"
      "\x89\x83\x07\x83\x52\x95\x81\x2d\x1f\x6a\x81\xea\xfe\x91\x92\xa4\x3a\x56"
      "\xb0\x47\xf5\xb2\x51\x05\x3e\xf9\xdb\x78\xd4\x7d\xa0\xd4\x8f\x6e\xb6\x40"
      "\x2d\xea\xdc\xe8\x7e\x3c\x9c\x0b\x69\x30\x6d\x88\x24\xfd\x92\x52\x56\x58"
      "\x9d\x5d\xdb\x31\xe2\x49\xf5\xdd\x9a\xa8\x3a\x41\xa3\x17\x3b\x3e\x65\xaa"
      "\x43\x93\x4d\x35\xa9\x30\xeb\xbf\x60\xbd\xd2\x30\x93\x3d\xf5\xe2\xa5\xce"
      "\xd3\x0b\x7e\x11\x60\x4b\x94\x6a\x8e\x3d\x5c\xc1\x05\x79\xa5\x99\x91\x03"
      "\xf8\x2f\x67\x05\x97\x56\x6c\xe6\x0a\x2e\xb9\xe6\x4a\xac\x19\xf5\x9a\xeb"
      "\xf4\x59\xe0\x4c\xf1\x33\x7a\x36\xce\xf1\x13\x5f\x6e\x17\x22\xba\xf8\x8c"
      "\xeb\xfc\xfe\x9f\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88"
      "\x88\x88\x88\x88\x88\x68\xd2\x54\xf1\xff\x12\x75\xd7\x91\x88\x88\x88\x88"
      "\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88"
      "\x68\xd2\xad\xb6\x60\x7e\xf7\x1a\x83\xe7\xff\xa2\xd8\xf3\x7f\xe3\x8f\x62"
      "\x71\xcd\x4f\x82\x1f\xca\xf3\x7f\x77\x37\xc1\xe7\xff\x12\x95\xef\x77\x00"
      "\x00\x00\xff\xff\x57\x91\x76\xa6",
      782));
  NONFAILING(syz_mount_image(
      /*fs=*/0x200007c0, /*dir=*/0x20000740,
      /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_NODIRATIME|MS_NOATIME|MS_MANDLOCK|0x80*/
      0x3000cc0, /*opts=*/0x20000800, /*chdir=*/0x11, /*size=*/0x30e,
      /*img=*/0x2001f6c0));
  //  syz_mount_image$vfat arguments: [
  //    fs: ptr[in, buffer] {
  //      buffer: {76 66 61 74 00} (length 0x5)
  //    }
  //    dir: ptr[in, buffer] {
  //      buffer: {2e 2f 62 75 73 00} (length 0x6)
  //    }
  //    flags: mount_flags = 0x204b82f (8 bytes)
  //    opts: nil
  //    chdir: int8 = 0x3 (1 bytes)
  //    size: len = 0x0 (8 bytes)
  //    img: ptr[in, buffer] {
  //      buffer: (compressed buffer with length 0x0)
  //    }
  //  ]
  //  returns fd_dir
  NONFAILING(memcpy((void*)0x200024c0, "vfat\000", 5));
  NONFAILING(memcpy((void*)0x200001c0, "./bus\000", 6));
  NONFAILING(syz_mount_image(
      /*fs=*/0x200024c0, /*dir=*/0x200001c0,
      /*flags=MS_LAZYTIME|MS_PRIVATE|MS_SILENT|MS_REMOUNT|MS_RDONLY|MS_NOSUID|0x380c*/
      0x204b82f, /*opts=*/0, /*chdir=*/3, /*size=*/0, /*img=*/0x20000240));
  //  chdir arguments: [
  //    dir: ptr[in, buffer] {
  //      buffer: {2e 2f 62 75 73 00} (length 0x6)
  //    }
  //  ]
  NONFAILING(memcpy((void*)0x200003c0, "./bus\000", 6));
  syscall(__NR_chdir, /*dir=*/0x200003c0ul);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
  //    }
  //    flags: open_flags = 0x183341 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x20000080, "./file1\000", 8));
  syscall(
      __NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000080ul,
      /*flags=O_TRUNC|O_SYNC|O_NOCTTY|O_CREAT|O_CLOEXEC|FASYNC|0x1*/ 0x183341,
      /*mode=*/0);
  //  openat$cgroup_ro arguments: [
  //    fd: fd_cgroup (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {62 6c 6b 69 6f 2e 62 66 71 2e 69 6f 5f 73 65 72 76 69 63 65
  //      64 00} (length 0x16)
  //    }
  //    flags: const = 0x275a (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x20002240, "blkio.bfq.io_serviced\000", 22));
  syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20002240ul,
          /*flags=*/0x275a, /*mode=*/0);
  //  openat$cgroup_ro arguments: [
  //    fd: fd_cgroup (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {63 67 72 6f 75 70 2e 73 74 61 74 00} (length 0xc)
  //    }
  //    flags: const = 0x275a (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x20000140, "cgroup.stat\000", 12));
  syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000140ul,
          /*flags=*/0x275a, /*mode=*/0);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  do_sandbox_none();
  return 0;
}