// https://syzkaller.appspot.com/bug?id=fbba09338bf57962dd72b6d079f0f054f07b0517
// 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 <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>

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);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
retry:
  while (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  struct dirent* ep = 0;
  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);
    while (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) {
    }
    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);
      if (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW))
        exit(1);
    }
  }
  closedir(dp);
  for (int 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) {
        if (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW))
          exit(1);
        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);
  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 setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void setup_sysctl()
{
  char mypid[32];
  snprintf(mypid, sizeof(mypid), "%d", getpid());
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/net/ipv4/ping_group_range", "0 65535"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", mypid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    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 < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[10] = {0xffffffffffffffff,
                  0xffffffffffffffff,
                  0xffffffffffffffff,
                  0xffffffffffffffff,
                  0x0,
                  0xffffffffffffffff,
                  0xffffffffffffffff,
                  0x0,
                  0xffffffffffffffff,
                  0x0};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x20000640 = 0;
  *(uint32_t*)0x20000648 = 0;
  *(uint64_t*)0x20000650 = 0x20000480;
  *(uint64_t*)0x20000480 = 0;
  *(uint64_t*)0x20000488 = 0x1c;
  *(uint64_t*)0x20000658 = 1;
  *(uint64_t*)0x20000660 = 0;
  *(uint64_t*)0x20000668 = 0;
  *(uint32_t*)0x20000670 = 0;
  syscall(__NR_sendmsg, r[1], 0x20000640ul, 0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    r[2] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x200003c0 = 0;
  *(uint32_t*)0x200003c8 = 0;
  *(uint64_t*)0x200003d0 = 0x20000000;
  *(uint64_t*)0x20000000 = 0x20000380;
  memcpy((void*)0x20000380,
         "\x3c\x00\x00\x00\x10\x00\x85\x46\x00\x00\x00\x00\x00\x00\xff\x01\x00"
         "\x00\x00\x00",
         20);
  *(uint32_t*)0x20000394 = r[2];
  memcpy((void*)0x20000398,
         "\x01\x00\x00\x00\x00\x22\x00\x00\x1c\x00\x12\x00\x0c\x00\x01\x00\x62"
         "\x6f\x6e\x64\x00\x00\x00\x00\x0c\x00\x02\x00\x08\x00\x01\x00\x06",
         33);
  *(uint64_t*)0x20000008 = 0x3c;
  *(uint64_t*)0x200003d8 = 1;
  *(uint64_t*)0x200003e0 = 0;
  *(uint64_t*)0x200003e8 = 0;
  *(uint32_t*)0x200003f0 = 0;
  syscall(__NR_sendmsg, r[0], 0x200003c0ul, 0ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[3] = res;
  *(uint32_t*)0x20000440 = 0x14;
  res = syscall(__NR_getsockname, r[1], 0x20000500ul, 0x20000440ul);
  if (res != -1)
    r[4] = *(uint32_t*)0x20000504;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[5] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[6] = res;
  *(uint64_t*)0x200001c0 = 0;
  *(uint32_t*)0x200001c8 = 0;
  *(uint64_t*)0x200001d0 = 0x20000180;
  *(uint64_t*)0x20000180 = 0;
  *(uint64_t*)0x20000188 = 0x3d2;
  *(uint64_t*)0x200001d8 = 1;
  *(uint64_t*)0x200001e0 = 0;
  *(uint64_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001f0 = 0;
  syscall(__NR_sendmsg, r[6], 0x200001c0ul, 0ul);
  *(uint32_t*)0x200002c0 = 0x14;
  res = syscall(__NR_getsockname, r[6], 0x20000080ul, 0x200002c0ul);
  if (res != -1)
    r[7] = *(uint32_t*)0x20000084;
  *(uint64_t*)0x200004c0 = 0;
  *(uint32_t*)0x200004c8 = 0;
  *(uint64_t*)0x200004d0 = 0x200006c0;
  *(uint64_t*)0x200006c0 = 0x200012c0;
  *(uint32_t*)0x200012c0 = 0x34;
  *(uint16_t*)0x200012c4 = 0x10;
  *(uint16_t*)0x200012c6 = 0x401;
  *(uint32_t*)0x200012c8 = 0;
  *(uint32_t*)0x200012cc = 0;
  *(uint8_t*)0x200012d0 = 0;
  *(uint8_t*)0x200012d1 = 0;
  *(uint16_t*)0x200012d2 = 0;
  *(uint32_t*)0x200012d4 = r[7];
  *(uint32_t*)0x200012d8 = 0x20745;
  *(uint32_t*)0x200012dc = 0;
  *(uint16_t*)0x200012e0 = 0x14;
  STORE_BY_BITMASK(uint16_t, , 0x200012e2, 0x12, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200012e3, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200012e3, 1, 7, 1);
  *(uint16_t*)0x200012e4 = 0xb;
  *(uint16_t*)0x200012e6 = 1;
  memcpy((void*)0x200012e8, "bridge\000", 7);
  *(uint16_t*)0x200012f0 = 4;
  STORE_BY_BITMASK(uint16_t, , 0x200012f2, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200012f3, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200012f3, 1, 7, 1);
  *(uint64_t*)0x200006c8 = 0x34;
  *(uint64_t*)0x200004d8 = 1;
  *(uint64_t*)0x200004e0 = 0;
  *(uint64_t*)0x200004e8 = 0;
  *(uint32_t*)0x200004f0 = 0;
  syscall(__NR_sendmsg, r[5], 0x200004c0ul, 0ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[8] = res;
  *(uint32_t*)0x20000280 = 0x14;
  res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000280ul);
  if (res != -1)
    r[9] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x20000080 = 0;
  *(uint32_t*)0x20000088 = 0;
  *(uint64_t*)0x20000090 = 0x20000040;
  *(uint64_t*)0x20000040 = 0x200000c0;
  *(uint32_t*)0x200000c0 = 0x28;
  *(uint16_t*)0x200000c4 = 0x10;
  *(uint16_t*)0x200000c6 = 0x825;
  *(uint32_t*)0x200000c8 = 0;
  *(uint32_t*)0x200000cc = 0;
  *(uint8_t*)0x200000d0 = 0x53;
  *(uint8_t*)0x200000d1 = 0;
  *(uint16_t*)0x200000d2 = 0;
  *(uint32_t*)0x200000d4 = r[9];
  *(uint32_t*)0x200000d8 = 0;
  *(uint32_t*)0x200000dc = 0;
  *(uint16_t*)0x200000e0 = 8;
  *(uint16_t*)0x200000e2 = 0xa;
  *(uint8_t*)0x200000e4 = 0xf;
  *(uint64_t*)0x20000048 = 0x28;
  *(uint64_t*)0x20000098 = 1;
  *(uint64_t*)0x200000a0 = 0;
  *(uint64_t*)0x200000a8 = 0;
  *(uint32_t*)0x200000b0 = 0;
  syscall(__NR_sendmsg, r[8], 0x20000080ul, 0ul);
  *(uint64_t*)0x20000240 = 0;
  *(uint32_t*)0x20000248 = 0xd1b34;
  *(uint64_t*)0x20000250 = 0x20000140;
  *(uint64_t*)0x20000140 = 0x20000700;
  *(uint32_t*)0x20000700 = 0x4c;
  *(uint16_t*)0x20000704 = 0x10;
  *(uint16_t*)0x20000706 = 0x401;
  *(uint32_t*)0x20000708 = 0;
  *(uint32_t*)0x2000070c = 0x25dfdbfe;
  *(uint8_t*)0x20000710 = 0;
  *(uint8_t*)0x20000711 = 0;
  *(uint16_t*)0x20000712 = 0;
  *(uint32_t*)0x20000714 = 0;
  *(uint32_t*)0x20000718 = 0;
  *(uint32_t*)0x2000071c = 0x880;
  *(uint16_t*)0x20000720 = 0x1c;
  STORE_BY_BITMASK(uint16_t, , 0x20000722, 0x12, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000723, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000723, 1, 7, 1);
  *(uint16_t*)0x20000724 = 9;
  *(uint16_t*)0x20000726 = 1;
  memcpy((void*)0x20000728, "vlan\000", 5);
  *(uint16_t*)0x20000730 = 0xc;
  STORE_BY_BITMASK(uint16_t, , 0x20000732, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000733, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000733, 1, 7, 1);
  *(uint16_t*)0x20000734 = 6;
  *(uint16_t*)0x20000736 = 1;
  *(uint16_t*)0x20000738 = 2;
  *(uint16_t*)0x2000073c = 8;
  *(uint16_t*)0x2000073e = 5;
  *(uint32_t*)0x20000740 = r[7];
  *(uint16_t*)0x20000744 = 8;
  *(uint16_t*)0x20000746 = 0xa;
  *(uint32_t*)0x20000748 = r[4];
  *(uint64_t*)0x20000148 = 0x4c;
  *(uint64_t*)0x20000258 = 1;
  *(uint64_t*)0x20000260 = 0;
  *(uint64_t*)0x20000268 = 0;
  *(uint32_t*)0x20000270 = 0;
  syscall(__NR_sendmsg, r[3], 0x20000240ul, 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);
  setup_sysctl();
  use_temporary_dir();
  loop();
  return 0;
}