// https://syzkaller.appspot.com/bug?id=a133db4b32d89957481e21b5080f9edfa3bf4359
// 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;
}

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

struct fs_image_segment {
  void* data;
  uintptr_t size;
  uintptr_t offset;
};

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (129 << 20)

static unsigned long fs_image_segment_check(unsigned long size,
                                            unsigned long nsegs,
                                            struct fs_image_segment* segs)
{
  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (size_t i = 0; i < nsegs; i++) {
    if (segs[i].size > IMAGE_MAX_SIZE)
      segs[i].size = IMAGE_MAX_SIZE;
    segs[i].offset %= IMAGE_MAX_SIZE;
    if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
      segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
    if (size < segs[i].offset + segs[i].offset)
      size = segs[i].offset + segs[i].offset;
  }
  if (size > IMAGE_MAX_SIZE)
    size = IMAGE_MAX_SIZE;
  return size;
}
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;
  size = fs_image_segment_check(size, nsegs, segs);
  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)
{
  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;
  }

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;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000040, "squashfs\000", 9);
  memcpy((void*)0x20000080, "./file0\000", 8);
  *(uint64_t*)0x20000200 = 0x20010000;
  memcpy(
      (void*)0x20010000,
      "\x68\x73\x71\x73\x07\x00\x00\x00\x91\x1d\x67\x5f\x00\x10\x00\x00\x01\x00"
      "\x00\x00\x06\x00\x0c\x00\xe0\x00\x02\x00\x04\x00\x00\x00\x1a\x01\x00\x00"
      "\x00\x00\x00\x00\xf5\x01\x00\x00\x00\x00\x00\x00\xa4\x01\x00\x00\x00\x00"
      "\x00\x00\xdd\x01\x00\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00"
      "\x15\x01\x00\x00\x00\x00\x00\x00\x6c\x01\x00\x00\x00\x00\x00\x00\x92\x01"
      "\x00\x00\x00\x00\x00\x00\x78\xda\x2b\xae\xac\xca\x4e\xcc\xc9\x49\x2d\x2a"
      "\xa6\x1d\xa3\x98\x0e\x76\x8c\x32\x46\x19\xa3\x8c\xa1\xc6\x40\x70\x01\x34"
      "\x43\xf4\x14\x92\x00\x78\xda\x63\x62\x78\xcb\xc8\xc0\xc0\xc8\x30\x51\x36"
      "\x3d\x1e\xc8\x40\x01\x29\x40\xcc\x84\x24\xcf\x8c\x26\x27\xc5\xc2\xc0\xc0"
      "\xcc\xf0\x1f\x2e\x0f\xe4\x32\x80\xcc\x50\x03\x62\xfd\x92\xdc\x02\xfd\xe2"
      "\xca\x2a\xdd\xcc\xdc\xc4\xf4\xd4\xf4\xd4\x3c\x13\x43\x4b\x73\x73\x33\x63"
      "\x4b\x23\xfd\xb4\xcc\x9c\x54\x03\x08\xc9\x88\x64\x3a\x13\xd4\x64\x10\xad"
      "\x09\xc4\xec\x40\xcc\x89\x24\xcf\x8a\x64\x3b\x57\x9a\x4b\x61\x2e\xaf\x63"
      "\x81\xd0\xc8\xfa\xd8\x80\xfc\x04\xa8\xbc\x86\x32\xaa\x3e\x90\x5d\xff\x81"
      "\x80\x01\x89\x46\x98\x79\x00\x6e\x06\x3b\x54\x0c\x14\x02\x21\x40\xff\x71"
      "\x00\x69\x00\x62\xdd\x28\x25\x45\x00\x78\xda\x63\x64\x80\x00\x66\x20\x56"
      "\x00\x62\x26\x06\x16\x86\xb4\xcc\x9c\x54\x03\x07\x06\x46\xa0\x20\x84\x63"
      "\xc8\x02\x55\xc5\x08\xa5\x99\x18\x38\xc0\x12\x7a\xc9\xf9\x39\x29\x75\x40"
      "\x61\x46\x98\xb6\x79\x40\x06\xcc\x0c\xc3\x6b\x0c\xac\x70\x8e\x11\x32\xc7"
      "\x18\x00\x38\xd7\x11\xc7\x0e\x00\x78\xda\x4b\x60\x80\x00\x45\x28\x0d\x00"
      "\x07\x18\x00\x82\x5c\x01\x00\x00\x00\x00\x00\x00\x1c\x00\x78\xda\x63\x60"
      "\x80\x80\x3a\x28\xad\x00\xa5\x1d\xa0\xf4\x3c\x28\x7d\x0d\x4a\x4b\x31\x42"
      "\x68\x00\x41\xdf\x02\x6e\x74\x01\x00\x00\x00\x00\x00\x00\x08\x80\x5c\xf9"
      "\x01\x00\x53\x5f\x01\x00\x9a\x01\x00\x00\x00\x00\x00\x00\x1d\x00\x78\xda"
      "\x63\x60\x60\x63\xa8\x48\x2c\x29\x29\x32\x64\x63\x60\x80\xb2\x18\x60\x62"
      "\x46\x70\x31\x23\x00\xb5\xbc\x09\xab\x10\x80\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x02\x00\x00\x00\x24\x00\x00\x00\xac\x01\x00\x00\x00\x00\x00\x00\x01"
      "\x00\x00\x00\x00\x00\x00\x00\xcb\x01",
      495);
  *(uint64_t*)0x20000208 = 0x1ef;
  *(uint64_t*)0x20000210 = 0;
  syz_mount_image(0x20000040, 0x20000080, 0x20000001f5, 1, 0x20000200, 0,
                  0x20000140);
  memcpy((void*)0x20001680, "/dev/loop#\000", 11);
  res = -1;
  res = syz_open_dev(0x20001680, 0, 0);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ioctl, r[0], 0x1261, 0ul);
}
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;
}