// https://syzkaller.appspot.com/bug?id=9386d051e11e09973d5a4cf79af5e8cedf79386d
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _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(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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 void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

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, long segments)
{
  unsigned long i;
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;
  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (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 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)
{
  char loopname[64], fs[32], opts[256];
  int loopfd, err = 0, res = -1;
  unsigned long i;
  NONFAILING(size = fs_image_segment_check(size, nsegs, segments));
  int memfd = syscall(sys_memfd_create, "syz_mount_image", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (i = 0; i < nsegs; i++) {
    struct fs_image_segment* segs = (struct fs_image_segment*)segments;
    int res1 = 0;
    NONFAILING(res1 =
                   pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset));
    if (res1 < 0) {
    }
  }
  snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
  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;
    }
  }
  mkdir((char*)dir, 0777);
  memset(fs, 0, sizeof(fs));
  NONFAILING(strncpy(fs, (char*)fsarg, sizeof(fs) - 1));
  memset(opts, 0, sizeof(opts));
  NONFAILING(strncpy(opts, (char*)optsarg, 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");
  }
  if (mount(loopname, (char*)dir, fs, flags, opts)) {
    err = errno;
    goto error_clear_loop;
  }
  res = 0;
error_clear_loop:
  ioctl(loopfd, LOOP_CLR_FD, 0);
error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return res;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (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;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    reset_loop();
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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;
    }
    remove_dir(cwdbuf);
  }
}

void execute_one(void)
{
  NONFAILING(memcpy((void*)0x20000180, "minix\000", 6));
  NONFAILING(memcpy((void*)0x20000140, "./file0\000", 8));
  NONFAILING(*(uint64_t*)0x20000000 = 0x20000100);
  NONFAILING(memcpy((void*)0x20000100, "\x60\x00\x84\xe0\x02\x00\x0a\x00\x90"
                                       "\x0c\xda\x40\xff\x1a\xd5\xc9\x8f\x13",
                    18));
  NONFAILING(*(uint64_t*)0x20000008 = 0x12);
  NONFAILING(*(uint64_t*)0x20000010 = 0x400);
  NONFAILING(*(uint64_t*)0x20000018 = 0x200001c0);
  NONFAILING(memcpy(
      (void*)0x200001c0,
      "\xee\x9f\x84\xa4\x3e\xcc\xaf\x13\x15\xbb\x39\x7d\x00\xc1\xb6\xdd\x82\x0d"
      "\xd1\x39\x16\x18\x1d\xba\x62\x09\x38\xcb\x30\xf1\xc2\x1a\xfe\x3d\x92\x62"
      "\x98\xb2\x58\x34\xe8\x90\x09\x2d\x64\x2c\xaf\xe5\xdb\x21\xba\x94\x94\xfe"
      "\xbc\xf6\x60\x79\xb7\x22\xe7\x3b\xe3\xa8\x70\x8a\x36\x24\x25\x0f\x9f\x59"
      "\xfb\xbe\x94\x29\x97\xc6\xc1\xe8\x3a\x34\xe5\x77\x9e\x8a\x4f\x40\xfd\xb6"
      "\xff\xe5\x9f\xfe\x49\x03\x50\x0d\x3c\xd8\xc8\xf3\xed\x19\x60\x72\x8f\x2d"
      "\x94\xcf\x7f\xca\xf2\x92\x2f\x8a\xab\x3b\xec\xc6\x0c\x8d\x39\xdd\xf4\x3c"
      "\xd6\xd2\xe9\x30\x1d\xa3\xca\xa3\x57\x19\xf2\x5a\x83\x47\x85\x59\xe0\xe8"
      "\x91\xdc\xb7\x56\xee\x22\x96\x4d\x03\xf3\x75\x61\xf5\x79\x74\x90\xa0\xb9"
      "\x35\x06\x48\x28\x22\x07\x5b\xa9\x6d\xb3\x5a\x44\x0d\x04\x6e\x44\xeb\x4a"
      "\x79\x98\x6b\x51\x82\x81\x60\x90\x03\xb6\xfa\xe0\x4a\x18\xbe\x9a\x83\xce"
      "\x7e\xfa\x2a\xb8\x0f\x75\xc9\x0d\x78\xf0\xb4\x17\x9d\x67\x43\x76\xdb\x1f"
      "\x7a\xe8\x74\x56\x41\xad\xcd\xe0\xd2\x45\x72\x27\x44\xbc\xea\x2f\xac\x94"
      "\x45\x01\x4e\xe2\x29\x39\x85\x11\x95\x73\xff\xcc\x0c\x22\xeb\x07\x69\xde"
      "\x1e\x9e\x5d\xb5\x3a\xa3\x37\x8a\x44\x26\x50\x30\x10\xa7\xc6\x24\x72\x65"
      "\x83\x82\x11\x52\x7a\x01\x32\xcc\xf8\x83\xee\x08\xa6\xea\x1a\x78\x5e\x47"
      "\xce\x16\x66\x3f\x1c\x74\x4a\xf4\x92\x00\xd5\xf3\xbc\x32\x6e\x7d\x90\x89"
      "\xa5\xf1\x7d\x0a\xd0\x4d\xe5\xea\xe8\xd6\xd9\xea\x1a\x71\x4e\x35\xc5\xc3"
      "\x85\x5f\x06\xe4\x8c\x20\x5f\x9b\x6d\x08\x7b\xa7\xd3\xb6\x74\x5e\x65\x70"
      "\x0c\x00\x95\x72\xa6\x5b\x4b\xfb\xf6\x68\x78\x21\xbc\x72\x3b\x61\xb5\xab"
      "\xe7\x35\x7e\x68\xa9\xb0\x64\x0b\xfb\x9c\x01\x00\x00\x80\x00\x00\x00\x00"
      "\x0e\x84\x0e\xcf\x37\x9c\x57\x6c\x05\x75\x7d\x44\xb1\x9d\xe0\xe2\xaa\x36"
      "\x4c\x42\x15\x62\x19\xa7\x2c\xc9\x43\xa6\x0f\x04\x10\x89\x1e\xd1\x34\xf3"
      "\x5f\x5f\xe6\xb4\xcf\x3a\xbb\xcb\x98\x44\x36\x32\x23\x58\xa7\xc9\x39\x37"
      "\x24\x86\x0d\x87\x25\x39\x81\xf9\xe7\x9d\xbe\xb7\x89\x57\x7e\xad\x0e\xde"
      "\x31\xe1\x9a\x2b\x11\x4a\x0e\x4d\x82\xb3\xe1\x02\x3d\xd2\x8b\x63\x82\xe6"
      "\x7e\xbd\x46\xd2\x91\x2e\x55\xcf\x99\x28\xda\x32\xc1\x02\x7c\xef\x7c\x6c"
      "\x61\x0e\xa8\xfc\xe1\x49\xa7\xaf\x20\x22\x4b\x4e\x02\x86\x01\x93\x6e\xf9"
      "\xa7\x8d\x80\xff\x55\x67\x08\x4e\xc1\x28\x76\x6e\x82\x2d\x61\x24\x18\x6d"
      "\x82\xe7\x60\x12\x8d\xd7\xde\x26\x53\x93\x9d\x35\x3c\x12\xf9\x6d\xef\xf3"
      "\xa2\x8b\x02\x2c\x78\x4b\xd3\x7d\xf7\xf7\x66\x40\xbc\xbc\xb0\x1a\x46\x76"
      "\xd5\x8b\x3e\x9c\x2b\xaa\xe6\x62\x30\xe5\xf5\x4a\x37\x52\x7e\x81\x29\xd1"
      "\x61\xb0\xc0\x6f\x25\x64\x8c\x55\xa7\xe5\xb2\xdb\x52\x80\x53\xc3\xe3\x86"
      "\x4f\x41\x72\x8b\x79\x35\xe5\x75\x56\x8a\xd1\x14\xeb\x8c\x81\x1b\xf1\x9e"
      "\x07\xa3\x98\xba\xbb\xc6\x4f\xbe\xab\x84\x26\x88\x55\x47\x83\xed\x15\x51"
      "\x94\x9a\x79\x1e\x33\x79\x9e\x59\xa3\x4b\x6b\xda\xbc\x34\x58\xc3\x79\xc7"
      "\x35\x19\x82\x92\xe5\xa2\x72\xf5\x73\x49\x24\x9d\x2c\x8a\x9a\xa5\x8f\x38"
      "\x35\xa3\xe1\x71\x60\x83\xbb\x04\x64\xcb\xe1\x40\xd1\x58\x7a\x21\xe4\xec"
      "\x2a\xe1\xf3\xad\x81\x13\x4d\xf5\x59\x03\xff\xb8\xe1\x73\x64\x63\x52\x91"
      "\x5a\x2c\x70\x67\x09\xcf\x46\x53\x89\x78\x22\x4c\x0d\x6d\xc4\x37\xcb\xfc"
      "\x37\xab\xfb\xd1\xb7\x85\xeb\x5c\xa3\xae\xb1\xac\x8c\xbd\x40\xd5\xba\x89"
      "\x6f\x79\xee\x8f\x76\xb0\x80\x9f\x59\xb8\x68\x62\x64\x87\x74\xd2\xac\xe9"
      "\x8b\x82\x5e\x7a\x46\x5b\x5d\xd8\x0e\x49\x19\x65\x97\x1e\x77\x97\xab\xa3"
      "\x96\x84\x41\x6d\x04\xfa\x9a\xf2\x7c\x3c\xe4\xf7\x23\x54\x62\x57\xc3\x81"
      "\x9e\x4e\x01\x0f\x77\xfc\x5f\x3b\x2a\xd3\x19\x60\x87\x01\x22\xfd\x70\xca"
      "\x9b\x0d\x25\x34\x77\x83\x17\x15\xf6\x4f\x93\xa6\x3f\x8c\xd5\x12\x26\x7b"
      "\x0d\xbc\x62\x15\xb3\x36\x0c\x25\xf3\x75\x2a\x16\x15\x2f\x6d\xa4\x06\x20"
      "\x8e\x78\xa2\xeb\xb0\xb1\x99\x7e\xc9\xe4\xb3\x17\x83\xb7\x3f\x37\xd6\x91"
      "\x95\x37\x6a\xb3\x4e\x4c\x77\x6c\xd5\x02\x0e\x0f\xff\xa7\x70\x7f\x7c\x60"
      "\x25\xdb\x9b\x1e\x33\xa2\xcb\x0f\x87\x18\x8c\x4e\x4b\x55\xae\x27\xed\xd6"
      "\xe9\xb7\xaa\x2c\x9e\xdd\x4c\x48\x43\x75\x57\xd6\xb2\x54\xad\x95\xcc\xa3"
      "\xde\xfa\x66\x3d\x7d\xd5\x52\xe0\x3c\x0e\xc4\x47\xe0\xf1\xef\xe3\xdb\x7f"
      "\x55\x92\x05\x56\xf6\xed\xb9\x4b\x01\x84\x91\x8c\xb2\x5e\xdd\xc5\x48\x12"
      "\x7d\x5c\x69\x74\xe0\x24\x6d\x88\x45\xd9\x8d\x97\xe7\x14\x60\x2a\x03\x90"
      "\x4b\x40\x31\xf2\x8a\xfd\x80\xa2\xbd\x05\x23\x07\xb0\xbf\x59\x47\xc3\x43"
      "\x0d\x63\x32\xd9\x68\x6a\x76\x88\x30\x8b\x65\xfc\x9c\x9c\xf6\xb0\xf8",
      1007));
  NONFAILING(*(uint64_t*)0x20000020 = 0x3ef);
  NONFAILING(*(uint64_t*)0x20000028 = 0x34f9);
  syz_mount_image(0x20000180, 0x20000140, 0, 2, 0x20000000, 0, 0);
  syscall(__NR_openat, 0xffffffffffffff9cul, 0ul, 0ul, 0ul);
  NONFAILING(memcpy((void*)0x200000c0, "./file0/file1\000", 14));
  syscall(__NR_open, 0x200000c0ul, 0x10103ul, 0x10ul);
}
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);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}