// 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 <sched.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/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/capability.h>

#ifndef __NR_io_pgetevents
#define __NR_io_pgetevents 333
#endif

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

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

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 MAX_FDS 30

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);
  }
}

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setsid();
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  setup_binderfs();
  loop();
  exit(1);
}

#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 close_fds()
{
  for (int fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

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();
      close_fds();
      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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  syscall(__NR_sendmsg, -1, 0ul, 0x4000001ul);
  NONFAILING(memcpy((void*)0x20000000, "./file0\000", 8));
  syscall(__NR_mkdir, 0x20000000ul, 0ul);
  NONFAILING(memcpy((void*)0x200000c0, "./file0\000", 8));
  syscall(__NR_mount, 0x20000000ul, 0x200000c0ul, 0ul, 0x2001001ul, 0ul);
  syscall(__NR_socket, 0x10ul, 3ul, 0);
  NONFAILING(*(uint32_t*)0x20000700 = 1);
  NONFAILING(*(uint32_t*)0x20000704 = 0x80);
  NONFAILING(*(uint8_t*)0x20000708 = 0);
  NONFAILING(*(uint8_t*)0x20000709 = 0);
  NONFAILING(*(uint8_t*)0x2000070a = 0);
  NONFAILING(*(uint8_t*)0x2000070b = 0);
  NONFAILING(*(uint32_t*)0x2000070c = 0);
  NONFAILING(*(uint64_t*)0x20000710 = 6);
  NONFAILING(*(uint64_t*)0x20000718 = 0);
  NONFAILING(*(uint64_t*)0x20000720 = 0);
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 0, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 1, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 2, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 4, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 5, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 6, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 7, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 8, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 9, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 10, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 11, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 12, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 13, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 14, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 15, 2));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 17, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 18, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 19, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 20, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 21, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 22, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 23, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 24, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 25, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 26, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 27, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 28, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 29, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 30, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 31, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 32, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 33, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 34, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 35, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 36, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 37, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000728, 0, 38, 26));
  NONFAILING(*(uint32_t*)0x20000730 = 0);
  NONFAILING(*(uint32_t*)0x20000734 = 0);
  NONFAILING(*(uint64_t*)0x20000738 = 2);
  NONFAILING(*(uint64_t*)0x20000740 = 0);
  NONFAILING(*(uint64_t*)0x20000748 = 2);
  NONFAILING(*(uint64_t*)0x20000750 = 0);
  NONFAILING(*(uint32_t*)0x20000758 = 0);
  NONFAILING(*(uint32_t*)0x2000075c = 2);
  NONFAILING(*(uint64_t*)0x20000760 = 3);
  NONFAILING(*(uint32_t*)0x20000768 = 0xfffffffd);
  NONFAILING(*(uint16_t*)0x2000076c = 0);
  NONFAILING(*(uint16_t*)0x2000076e = 0);
  NONFAILING(*(uint32_t*)0x20000770 = 0);
  NONFAILING(*(uint32_t*)0x20000774 = 0);
  NONFAILING(*(uint64_t*)0x20000778 = 0);
  res = syscall(__NR_perf_event_open, 0x20000700ul, 0, -1ul, -1, 0ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ioctl, -1, 0x8040451b, 0ul);
  NONFAILING(memcpy((void*)0x20000300, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x20000180, "./file0\000", 8));
  syscall(__NR_pivot_root, 0x20000300ul, 0x20000180ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_socket, 0xaul, 3ul, 0x3a);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint32_t*)0x20000140 = 0x6e);
  syscall(__NR_getpeername, -1, 0x20000200ul, 0x20000140ul);
  syscall(__NR_io_cancel, 0ul, 0ul, 0x200002c0ul);
  NONFAILING(
      memcpy((void*)0x20000340,
             "\xa8\xb8\xaa\xe1\xd4\x2e\x4d\x92\x70\x10\x4f\x01\x9b\xe3\x3d\x35"
             "\xd7\x49\xab\x2f\x18\x7e\x43\x03\x42\xe3\x75\xa4\x5d\xf4\x01\x05"
             "\x00\x29\x03\x17\xbc\xc7\xe9\x0a\x58\x51\xa3\xc2\x89\x45\x58\x91"
             "\x0c\xbe\x6d\x0a\x2c\xa7\x3d\xac\x6c\x1f\x87\x5d\xd7\xc8\x3e\x4e"
             "\x3a\xae\x1e\x03\x70\x47\x4f\xc8\x46\x75\xcd\x91\xa2\xdc\x85\xd3"
             "\x28\x9d\x75\x13\x93\xd0\x72\xcd\x8c\xf1\xe4\x24\xba\xdf\x8b\xdd"
             "\x68\x12\x29\x90\x46\xc8\x10\xbd\xff\x07\x00\x04\x00\x00\x00",
             111));
  syscall(__NR_fremovexattr, r[0], 0x20000340ul);
  res = -1;
  NONFAILING(res = syz_open_dev(0xc, 0xb4, 0xa9b));
  if (res != -1)
    r[3] = res;
  NONFAILING(*(uint64_t*)0x20000080 = 2);
  syscall(__NR_fcntl, r[3], 0x40cul, 0x20000080ul);
  syscall(__NR_ioctl, -1, 0x8933, 0ul);
  NONFAILING(*(uint16_t*)0x20000100 = 0xa);
  NONFAILING(*(uint16_t*)0x20000102 = htobe16(0));
  NONFAILING(*(uint32_t*)0x20000104 = htobe32(0));
  NONFAILING(memset((void*)0x20000108, 0, 16));
  NONFAILING(*(uint32_t*)0x20000118 = 0);
  syscall(__NR_connect, r[2], 0x20000100ul, 0x1cul);
  NONFAILING(*(uint64_t*)0x200003c0 = 0x20000280);
  NONFAILING(*(uint64_t*)0x20000280 = 3);
  NONFAILING(*(uint64_t*)0x200003c8 = 8);
  syscall(__NR_io_pgetevents, 0ul, 0x89a2ul, 1ul, 0x200001c0ul, 0ul,
          0x200003c0ul);
  NONFAILING(*(uint64_t*)0x20000540 = 0x20000040);
  NONFAILING(
      memcpy((void*)0x20000040,
             "\x39\x00\x00\x00\x13\x00\x03\x47\x00\xbb\x65\xe1\xc3\xe4\xff\xff"
             "\x06\x00\x00\x00\x01\x00\x00\x00\x45\x00\x00\x00\x25\x00\x00\x00"
             "\x19\x00\x04\x00\x04\x00\x00\x00\x07\xfd\x17\xe5\xff\xff\x06\x06"
             "\x04\x00\x00\x00\x00\x00\x00\x00\x00",
             57));
  NONFAILING(*(uint64_t*)0x20000548 = 0x39);
  syscall(__NR_writev, r[1], 0x20000540ul, 1ul);
}
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();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}