// https://syzkaller.appspot.com/bug?id=c7211e4ffd8b044499a41588b235af65f6a770f3
// 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>

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;
};

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

#define sys_memfd_create 319

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(sys_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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  memcpy((void*)0x20000000, "ntfs\000", 5);
  memcpy((void*)0x20000100, "./file0\000", 8);
  *(uint64_t*)0x20000200 = 0x20010000;
  memcpy((void*)0x20010000,
         "\xeb\x52\x90\x4e\x54\x46\x53\x20\x20\x20\x20\x00\x04\x04\x00\x00\x00"
         "\x00\x00\x00\x00\xf8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x80\x00\x80\x00\xff\x07\x00\x00\x00\x00\x00\x00\x04\x00\x00"
         "\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x00\x00\x00\xf6\x00\x00\x00"
         "\x01\x00\x00\x00\xa3\xb8\xb2\x0f\xcf\x7a\xa8\x36\x00\x00\x00\x00\x0e"
         "\x1f\xbe\x71\x7c\xac\x22\xc0\x74\x0b\x56\xb4\x0e\xbb\x07\x00\xcd\x10"
         "\x5e\xeb\xf0\x32\xe4\xcd\x16\xcd\x19\xeb\xfe\x54\x68\x69\x73\x20\x69"
         "\x73\x20\x6e\x6f\x74\x20\x61\x20\x62\x6f\x6f\x74\x61\x62\x6c\x65\x20"
         "\x64\x69\x73\x6b\x2e\x20\x50\x6c\x65\x61\x73\x65\x20\x69\x6e\x73\x65"
         "\x72\x74\x20\x61\x20\x62\x6f\x6f\x74\x61\x62\x6c\x65\x20\x66\x6c\x6f"
         "\x70\x70\x79\x20\x61\x6e\x64\x0d\x0a\x70\x72\x65\x73\x73\x20\x61\x6e"
         "\x79\x20\x6b\x65\x79\x20\x74\x6f\x20\x74\x72\x79\x20\x61\x67\x61\x69"
         "\x6e\x20\x2e\x2e\x2e\x20\x0d\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00",
         224);
  *(uint64_t*)0x20000208 = 0xe0;
  *(uint64_t*)0x20000210 = 0;
  *(uint64_t*)0x20000218 = 0;
  *(uint64_t*)0x20000220 = 0;
  *(uint64_t*)0x20000228 = 0x1e0;
  *(uint64_t*)0x20000230 = 0;
  *(uint64_t*)0x20000238 = 0;
  *(uint64_t*)0x20000240 = 0x2000;
  *(uint64_t*)0x20000248 = 0;
  *(uint64_t*)0x20000250 = 0;
  *(uint64_t*)0x20000258 = 0x4000;
  *(uint64_t*)0x20000260 = 0;
  *(uint64_t*)0x20000268 = 0;
  *(uint64_t*)0x20000270 = 0x41e0;
  *(uint64_t*)0x20000278 = 0;
  *(uint64_t*)0x20000280 = 0;
  *(uint64_t*)0x20000288 = 0x43e0;
  *(uint64_t*)0x20000290 = 0;
  *(uint64_t*)0x20000298 = 0;
  *(uint64_t*)0x200002a0 = 0x45e0;
  *(uint64_t*)0x200002a8 = 0;
  *(uint64_t*)0x200002b0 = 0;
  *(uint64_t*)0x200002b8 = 0x47e0;
  *(uint64_t*)0x200002c0 = 0;
  *(uint64_t*)0x200002c8 = 0;
  *(uint64_t*)0x200002d0 = 0x49e0;
  *(uint64_t*)0x200002d8 = 0;
  *(uint64_t*)0x200002e0 = 0;
  *(uint64_t*)0x200002e8 = 0x4be0;
  *(uint64_t*)0x200002f0 = 0;
  *(uint64_t*)0x200002f8 = 0;
  *(uint64_t*)0x20000300 = 0x4fe0;
  *(uint64_t*)0x20000308 = 0;
  *(uint64_t*)0x20000310 = 0;
  *(uint64_t*)0x20000318 = 0x51e0;
  *(uint64_t*)0x20000320 = 0;
  *(uint64_t*)0x20000328 = 0;
  *(uint64_t*)0x20000330 = 0x53e0;
  *(uint64_t*)0x20000338 = 0;
  *(uint64_t*)0x20000340 = 0;
  *(uint64_t*)0x20000348 = 0x57e0;
  *(uint64_t*)0x20000350 = 0;
  *(uint64_t*)0x20000358 = 0;
  *(uint64_t*)0x20000360 = 0x59e0;
  *(uint64_t*)0x20000368 = 0;
  *(uint64_t*)0x20000370 = 0;
  *(uint64_t*)0x20000378 = 0x5be0;
  *(uint64_t*)0x20000380 = 0;
  *(uint64_t*)0x20000388 = 0;
  *(uint64_t*)0x20000390 = 0x5de1;
  *(uint64_t*)0x20000398 = 0;
  *(uint64_t*)0x200003a0 = 0;
  *(uint64_t*)0x200003a8 = 0x5fe0;
  *(uint64_t*)0x200003b0 = 0;
  *(uint64_t*)0x200003b8 = 0;
  *(uint64_t*)0x200003c0 = 0x61e0;
  *(uint64_t*)0x200003c8 = 0;
  *(uint64_t*)0x200003d0 = 0;
  *(uint64_t*)0x200003d8 = 0x63e0;
  *(uint64_t*)0x200003e0 = 0;
  *(uint64_t*)0x200003e8 = 0;
  *(uint64_t*)0x200003f0 = 0x67e0;
  *(uint64_t*)0x200003f8 = 0;
  *(uint64_t*)0x20000400 = 0;
  *(uint64_t*)0x20000408 = 0x69e0;
  *(uint64_t*)0x20000410 = 0;
  *(uint64_t*)0x20000418 = 0;
  *(uint64_t*)0x20000420 = 0x6be0;
  *(uint64_t*)0x20000428 = 0;
  *(uint64_t*)0x20000430 = 0;
  *(uint64_t*)0x20000438 = 0x6fe0;
  *(uint64_t*)0x20000440 = 0;
  *(uint64_t*)0x20000448 = 0;
  *(uint64_t*)0x20000450 = 0x71e0;
  *(uint64_t*)0x20000458 = 0;
  *(uint64_t*)0x20000460 = 0;
  *(uint64_t*)0x20000468 = 0x73e0;
  *(uint64_t*)0x20000470 = 0;
  *(uint64_t*)0x20000478 = 0;
  *(uint64_t*)0x20000480 = 0x75e0;
  *(uint64_t*)0x20000488 = 0;
  *(uint64_t*)0x20000490 = 0;
  *(uint64_t*)0x20000498 = 0x77e0;
  *(uint64_t*)0x200004a0 = 0;
  *(uint64_t*)0x200004a8 = 0;
  *(uint64_t*)0x200004b0 = 0x79e0;
  *(uint64_t*)0x200004b8 = 0;
  *(uint64_t*)0x200004c0 = 0;
  *(uint64_t*)0x200004c8 = 0x7be0;
  *(uint64_t*)0x200004d0 = 0;
  *(uint64_t*)0x200004d8 = 0;
  *(uint64_t*)0x200004e0 = 0x7de0;
  *(uint64_t*)0x200004e8 = 0;
  *(uint64_t*)0x200004f0 = 0;
  *(uint64_t*)0x200004f8 = 0x7fe0;
  *(uint64_t*)0x20000500 = 0;
  *(uint64_t*)0x20000508 = 0;
  *(uint64_t*)0x20000510 = 0x81e0;
  *(uint64_t*)0x20000518 = 0;
  *(uint64_t*)0x20000520 = 0;
  *(uint64_t*)0x20000528 = 0x83e0;
  *(uint64_t*)0x20000530 = 0;
  *(uint64_t*)0x20000538 = 0;
  *(uint64_t*)0x20000540 = 0x85e0;
  *(uint64_t*)0x20000548 = 0;
  *(uint64_t*)0x20000550 = 0;
  *(uint64_t*)0x20000558 = 0x87e0;
  *(uint64_t*)0x20000560 = 0;
  *(uint64_t*)0x20000568 = 0;
  *(uint64_t*)0x20000570 = 0x89e0;
  *(uint64_t*)0x20000578 = 0;
  *(uint64_t*)0x20000580 = 0;
  *(uint64_t*)0x20000588 = 0x8be0;
  *(uint64_t*)0x20000590 = 0;
  *(uint64_t*)0x20000598 = 0;
  *(uint64_t*)0x200005a0 = 0x8de0;
  *(uint64_t*)0x200005a8 = 0;
  *(uint64_t*)0x200005b0 = 0;
  *(uint64_t*)0x200005b8 = 0x8fe0;
  *(uint64_t*)0x200005c0 = 0;
  *(uint64_t*)0x200005c8 = 0;
  *(uint64_t*)0x200005d0 = 0x91e0;
  *(uint64_t*)0x200005d8 = 0;
  *(uint64_t*)0x200005e0 = 0;
  *(uint64_t*)0x200005e8 = 0x93e0;
  *(uint64_t*)0x200005f0 = 0;
  *(uint64_t*)0x200005f8 = 0;
  *(uint64_t*)0x20000600 = 0x95e0;
  *(uint64_t*)0x20000608 = 0;
  *(uint64_t*)0x20000610 = 0;
  *(uint64_t*)0x20000618 = 0x97e0;
  *(uint64_t*)0x20000620 = 0;
  *(uint64_t*)0x20000628 = 0;
  *(uint64_t*)0x20000630 = 0x99e0;
  *(uint64_t*)0x20000638 = 0;
  *(uint64_t*)0x20000640 = 0;
  *(uint64_t*)0x20000648 = 0x9be0;
  *(uint64_t*)0x20000650 = 0;
  *(uint64_t*)0x20000658 = 0;
  *(uint64_t*)0x20000660 = 0x9de0;
  *(uint64_t*)0x20000668 = 0;
  *(uint64_t*)0x20000670 = 0;
  *(uint64_t*)0x20000678 = 0x9fe0;
  *(uint64_t*)0x20000680 = 0;
  *(uint64_t*)0x20000688 = 0;
  *(uint64_t*)0x20000690 = 0xa3e0;
  *(uint64_t*)0x20000698 = 0;
  *(uint64_t*)0x200006a0 = 0;
  *(uint64_t*)0x200006a8 = 0xa5e0;
  *(uint64_t*)0x200006b0 = 0;
  *(uint64_t*)0x200006b8 = 0;
  *(uint64_t*)0x200006c0 = 0xa7e0;
  *(uint64_t*)0x200006c8 = 0;
  *(uint64_t*)0x200006d0 = 0;
  *(uint64_t*)0x200006d8 = 0xa9e0;
  *(uint64_t*)0x200006e0 = 0;
  *(uint64_t*)0x200006e8 = 0;
  *(uint64_t*)0x200006f0 = 0xabe0;
  *(uint64_t*)0x200006f8 = 0;
  *(uint64_t*)0x20000700 = 0;
  *(uint64_t*)0x20000708 = 0xade0;
  *(uint64_t*)0x20000710 = 0;
  *(uint64_t*)0x20000718 = 0;
  *(uint64_t*)0x20000720 = 0xafe0;
  *(uint64_t*)0x20000728 = 0;
  *(uint64_t*)0x20000730 = 0;
  *(uint64_t*)0x20000738 = 0xb1e0;
  *(uint64_t*)0x20000740 = 0;
  *(uint64_t*)0x20000748 = 0;
  *(uint64_t*)0x20000750 = 0xb3e0;
  *(uint64_t*)0x20000758 = 0x2001bf00;
  memcpy((void*)0x2001bf00, "\x90\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                            "\x40\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                            "\xff\xff",
         26);
  *(uint64_t*)0x20000760 = 0x1a;
  *(uint64_t*)0x20000768 = 0x1f;
  *(uint8_t*)0x2007dc00 = 0;
  syz_mount_image(0x20000000, 0x20000100, 0, 0x3a, 0x20000200, 0, 0x2007dc00);
}
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;
}