// https://syzkaller.appspot.com/bug?id=7db3a0ee48a805cd26f19586fd8b7f32f84f304b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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/mount.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static unsigned long long procid;

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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;
}

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;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void reset_loop()
{
  char buf[64];
  snprintf(buf, sizeof(buf), "/dev/loop%llu", procid);
  int loopfd = open(buf, O_RDWR);
  if (loopfd != -1) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    reset_loop();
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  memcpy((void*)0x20000000, "bfs\000", 4);
  memcpy((void*)0x200005c0, "./file0\000", 8);
  *(uint64_t*)0x20000200 = 0x20000100;
  memcpy((void*)0x20000100, "\xce\xfa\xad\x1b\x00\x0e\x00\x00\xff\x7f", 10);
  *(uint64_t*)0x20000208 = 0xa;
  *(uint64_t*)0x20000210 = 0;
  *(uint64_t*)0x20000218 = 0x20010040;
  memcpy((void*)0x20010040,
         "\x02\x00\x00\x00\x07\x00\x00\x00\x08\x00\x00\x00\x1f\x0e\x00\x00\x02",
         17);
  *(uint64_t*)0x20000220 = 0x11;
  *(uint64_t*)0x20000228 = 0x200;
  *(uint64_t*)0x20000230 = 0x20000280;
  memcpy(
      (void*)0x20000280,
      "\x02\x00\x2e\x00\xc5\x00\x53\x00\x00\x00\x00\x00\x20\x00\xd6\x48\x5d\xc3"
      "\x7d\xf1\x06\x96\xbb\x54\xe5\x81\x67\x7d\xfa\x6c\x83\xbe\xf5\xea\xb1\xdf"
      "\x18\xcc\xdb\x2b\xc6\xd4\x1c\x71\x82\x17\x2d\x59\xa0\x02\xc5\x9b\x2a\x98"
      "\x2f\x9f\xcc\xe1\x28\x54\x36\x06\xf6\xdc\xfe\xe3\x98\x28\xc4\xa1\x84\xd3"
      "\xef\x43\x14\xa0\x8b\xcc\x77\xa1\x17\x87\x11\x00\x48\xfb\x25\x44\x03\xb7"
      "\xb9\xff\xff\x00\x00\x00\x00\x00\x00\x1a\x2c\xd2\x47\x7d\x9f\xe4\x66\x77"
      "\xcd\x5d\x93\xfb\x60\xe3\x17\x43\x6c\x5b\x8e\x78\xe1\x89\xd5\x7a\xce\x52"
      "\xd0\x34\x9c\x59\x90\x1f\x37\x8b\xd3\xec\x97\x83\x47\xe5\x02\x9d\xd0\x5b"
      "\x7c\x71\x0f\x84\x83\x99\x59\xd3\x8b\xeb\x6d\x7f\xde\x56\x06\xa9\xe9\xa7"
      "\xeb\x57\x4d\xf2\x06\xad\x46\xec\x67\x31\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x86\xcc\xaf\xa2\xa5\x0c\xda\x5e\x92\x00\x2c\x8d\x8b\x7b\xd5\xcf\x0f"
      "\x88\x19\x24\x34\x28\xeb\x68\x7e\x68\x96\x3f\x11\x15\xed\x9f\xa3\x18\x36"
      "\xab\x40\xc5\x55\x56\xf9\x1c\x4c\xc8\xe4\x2b\x5a\x41\x80\xeb\x81\x0e\xce"
      "\x3d\x4a\x4a\xf4\x8d\xa8\xc5\xdb\x9a\x38\xa5\xad\x41\xa6\xd7\x29\xf9\xdf"
      "\xd0\x3b\xbe\x73\x6d\x6e\x0a\xd7\xde\x90\xc9\x88\x5b\x29\xfc\x82\xbc\x72"
      "\xf0\x18\xbf\x3f\x37\x6d\x4c\x96\x83\xa5\x1a\x2f\x4e\xd6\x53\x92\xc3\x9e"
      "\x73\x18\x61\x5c\x65\xa7\x46\xbe\x38\x4f\xd9\xbd\x0f\x42\x84\xd6\x21\xe5"
      "\x5d\x2c\x7b\xbc\xc5\x8d\x40\x68\x78\x95\x49\xdd\xca\xb7\x51\xe7\xae\x1a"
      "\x54\x4c\xc9\x35\x57\x20\x08\x0a\x27\x28\x54\x13\x5e\xe0\xed\x90\x50\xd3"
      "\x97\xc0\x1a\xf8\x04\x5d\xc5\xc5\xa4\x84\x9b\x1e\x88\x79\xd5\x7a\x71\x36"
      "\x06\x71\x5b\x4f\x7c\xa2\xac\x8c\x01\x69\x54\x1f\x02\xe6\x91\xf3\x28\xea"
      "\x17\xf6\x97\x95\x84\xb9\x09\x69\x40\x62\xbe\x61\xeb\xa8\xe5\xd0\x36\xe7"
      "\x04\x84\x38\x8d\x9c\x07\xf2\x16\x4d\xfe\xbb\xb9\x9b\xb6\x1d\x7d\x4a\x81"
      "\xed\x63\xed\x62\x0d\x55\xe6\x71\x4e\x39\xf8\xeb\x0f\x9a\xc9\x1c\x21\x81"
      "\x70\x4a\xc8\x60\x00\x46\x35\x96\x75\x32\x6e\x4e\xcc\x79\xd1\x8f\x05\x29"
      "\x0a\x87\x5f\x08\xd6\xee\x3d\x21\x0e\x26\xf6\x06\x9f\x0a\xda\x74\x1e\x01"
      "\x6b\x64\x5b\xa3\x98\x57\xa8\x4c\x0b\xea\x6c\x49\x05\x28\xa7\xd1\x3e\x02"
      "\x32\x75\xcc\x1a\x28\xab\x41\x57\x3f\x37\x48\x43\x81\x56\x05\x2b\x35\xc8"
      "\xb6\xea\xc5\xe4\x18\x2b\xa2\x70\x84\xf9\xc6\x61\x6c\x43\x2a\x25\xfb\x86"
      "\x34\xef\x39\x54\x25\x2f\x96\x1c\x9d\x8f\x0c\x23\xdd\x8b\xef\x19\xc5\x3d"
      "\x78\xce\xbc\x69\x91\xb7\xdc\x6f\x54\x65\xe0\xa0\xa5\xc0\x3e\x4a\x95\xf5"
      "\x7d\xda\x28\x80\xc1\x20\x63\xce\xd9\x6a\x7d\x1b\x2f\xa2\x21\xbb\xc5\x0e"
      "\x32\x54\x77\x27\x5b\x18\x26\x17\x9c\xcd\xfd\x35\x7b\x66\x05\xa3\xf7\x53"
      "\x94\x08\x2f\x1c\x98\xf7\xcf\xfc\x62\x9c\x0d\x5d\x6a\xa5\x75\xfc\xf3\xba"
      "\xf2",
      613);
  *(uint64_t*)0x20000238 = 0x265;
  *(uint64_t*)0x20000240 = 0xdfc;
  syz_mount_image(0x20000000, 0x200005c0, 0x8000, 3, 0x20000200, 0, 0x200100a0,
                  1);
  memcpy((void*)0x20000040, "./file0\000", 8);
  syscall(__NR_mknod, 0x20000040ul, 0ul, 0);
}
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);
  loop();
  return 0;
}