// https://syzkaller.appspot.com/bug?id=5284f1453720924e6f9676da8c7776203be35ce2
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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>
#include <linux/futex.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 thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

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 void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  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)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  if (getppid() == 1)
    exit(1);
  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);
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  sandbox_common_mount_tmpfs();
  loop();
  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");
}

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

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 6; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  close_fds();
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0x0};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  openat$binderfs arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 62 69 6e 64 65 72 66 73 2f 62 69 6e 64 65 72 31 00}
    //      (length 0x13)
    //    }
    //    flags: binder_open_flags = 0x0 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_binder
    memcpy((void*)0x200000000400, "./binderfs/binder1\000", 19);
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x200000000400ul, /*flags=*/0, /*mode=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  ioctl$BINDER_SET_CONTEXT_MGR_EXT arguments: [
    //    fd: fd_binder (resource)
    //    cmd: const = 0x4018620d (4 bytes)
    //    arg: ptr[in, flat_binder_object_t[BINDER_TYPE_BINDER, binder_node]] {
    //      flat_binder_object_t[BINDER_TYPE_BINDER, binder_node] {
    //        type: const = 0x73622a85 (4 bytes)
    //        flags: binder_flat_flags = 0x1381 (4 bytes)
    //        binder: int64 = 0x3 (8 bytes)
    //        cookie: const = 0x0 (8 bytes)
    //      }
    //    }
    //  ]
    *(uint32_t*)0x200000000140 = 0x73622a85;
    *(uint32_t*)0x200000000144 = 0x1381;
    *(uint64_t*)0x200000000148 = 3;
    *(uint64_t*)0x200000000150 = 0;
    syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4018620d,
            /*arg=*/0x200000000140ul);
    break;
  case 2:
    //  mmap$binder arguments: [
    //    addr: nil
    //    len: len = 0x2000 (8 bytes)
    //    prot: const = 0x1 (8 bytes)
    //    flags: const = 0x11 (8 bytes)
    //    fd: fd_binder (resource)
    //    offset: intptr = 0x0 (8 bytes)
    //  ]
    //  returns binder_ptr
    res = syscall(__NR_mmap, /*addr=*/0x2000000a0000ul, /*len=*/0x2000ul,
                  /*prot=*/1ul, /*flags=*/0x11ul, /*fd=*/r[0], /*offset=*/0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    //  setrlimit arguments: [
    //    res: rlimit_type = 0xe (8 bytes)
    //    rlim: ptr[in, rlimit] {
    //      rlimit {
    //        soft: intptr = 0x280000000 (8 bytes)
    //        hard: intptr = 0xffffffff00000001 (8 bytes)
    //      }
    //    }
    //  ]
    *(uint64_t*)0x2000000000c0 = 0x280000000;
    *(uint64_t*)0x2000000000c8 = 0xffffffff00000001;
    syscall(__NR_setrlimit, /*res=RLIMIT_RTPRIO*/ 0xeul,
            /*rlim=*/0x2000000000c0ul);
    break;
  case 4:
    //  ioctl$BINDER_WRITE_READ arguments: [
    //    fd: fd_binder (resource)
    //    cmd: const = 0xc0306201 (4 bytes)
    //    arg: ptr[in, binder_write_read] {
    //      binder_write_read {
    //        write_size: bytesize = 0x10 (8 bytes)
    //        write_consumed: const = 0x0 (8 bytes)
    //        write_buffer: ptr[in, array[binder_write_cmd]] {
    //          array[binder_write_cmd] {
    //            union binder_write_cmd {
    //              free_buffer: binder_cmd_free_buffer {
    //                cmd: const = 0x40086303 (4 bytes)
    //                ptr: binder_ptr (resource)
    //              }
    //            }
    //            union binder_write_cmd {
    //              enter_looper: binder_cmd_enter_looper {
    //                cmd: const = 0x630c (4 bytes)
    //              }
    //            }
    //          }
    //        }
    //        read_size: bytesize = 0x51 (8 bytes)
    //        read_consumed: const = 0x0 (8 bytes)
    //        read_buffer: ptr[in, buffer] {
    //          buffer: {ea b7 ef f9 f9 11 a8 68 79 76 f7 a6 c5 99 8d d7 8b ac
    //          5f ab 3d 85 03 b4 66 31 f2 79 d4 4f f4 85 34 e4 b9 69 6e 0c fd
    //          4f b4 5a 17 df 1d 83 d3 23 4c 99 10 e5 72 e3 4d 90 28 37 35 2e
    //          bb 7f 40 e6 38 63 7e 2d 08 82 b3 50 46 5d 58 58 35 d5 42 96 0a}
    //          (length 0x51)
    //        }
    //      }
    //    }
    //  ]
    *(uint64_t*)0x200000000bc0 = 0x10;
    *(uint64_t*)0x200000000bc8 = 0;
    *(uint64_t*)0x200000000bd0 = 0x200000000ac0;
    *(uint32_t*)0x200000000ac0 = 0x40086303;
    *(uint64_t*)0x200000000ac4 = r[1];
    *(uint32_t*)0x200000000acc = 0x630c;
    *(uint64_t*)0x200000000bd8 = 0x51;
    *(uint64_t*)0x200000000be0 = 0;
    *(uint64_t*)0x200000000be8 = 0x200000000b00;
    memcpy(
        (void*)0x200000000b00,
        "\xea\xb7\xef\xf9\xf9\x11\xa8\x68\x79\x76\xf7\xa6\xc5\x99\x8d\xd7\x8b"
        "\xac\x5f\xab\x3d\x85\x03\xb4\x66\x31\xf2\x79\xd4\x4f\xf4\x85\x34\xe4"
        "\xb9\x69\x6e\x0c\xfd\x4f\xb4\x5a\x17\xdf\x1d\x83\xd3\x23\x4c\x99\x10"
        "\xe5\x72\xe3\x4d\x90\x28\x37\x35\x2e\xbb\x7f\x40\xe6\x38\x63\x7e\x2d"
        "\x08\x82\xb3\x50\x46\x5d\x58\x58\x35\xd5\x42\x96\x0a",
        81);
    syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc0306201,
            /*arg=*/0x200000000bc0ul);
    break;
  case 5:
    //  ioctl$BINDER_WRITE_READ arguments: [
    //    fd: fd_binder (resource)
    //    cmd: const = 0xc0306201 (4 bytes)
    //    arg: ptr[in, binder_write_read] {
    //      binder_write_read {
    //        write_size: bytesize = 0x4c (8 bytes)
    //        write_consumed: const = 0x0 (8 bytes)
    //        write_buffer: ptr[in, array[binder_write_cmd]] {
    //          array[binder_write_cmd] {
    //            union binder_write_cmd {
    //              transaction_sg: binder_cmd_transaction_sg {
    //                cmd: const = 0x40486311 (4 bytes)
    //                data: binder_transaction_data {
    //                  handle: int32 = 0x0 (4 bytes)
    //                  pad: const = 0x0 (4 bytes)
    //                  cookie: const = 0x0 (8 bytes)
    //                  code: const = 0x0 (4 bytes)
    //                  flags: binder_transaction_flags = 0x20 (4 bytes)
    //                  sender_pid: const = 0x0 (4 bytes)
    //                  sender_euid: const = 0x0 (4 bytes)
    //                  data_size: bytesize = 0x0 (8 bytes)
    //                  offsets_size: bytesize = 0x0 (8 bytes)
    //                  buffer: nil
    //                  offsets: nil
    //                }
    //                buffers_size: binder_sg_size = 0x1000 (8 bytes)
    //              }
    //            }
    //          }
    //        }
    //        read_size: bytesize = 0x0 (8 bytes)
    //        read_consumed: const = 0x0 (8 bytes)
    //        read_buffer: nil
    //      }
    //    }
    //  ]
    *(uint64_t*)0x200000000180 = 0x4c;
    *(uint64_t*)0x200000000188 = 0;
    *(uint64_t*)0x200000000190 = 0x200000000500;
    *(uint32_t*)0x200000000500 = 0x40486311;
    *(uint32_t*)0x200000000504 = 0;
    *(uint32_t*)0x200000000508 = 0;
    *(uint64_t*)0x20000000050c = 0;
    *(uint32_t*)0x200000000514 = 0;
    *(uint32_t*)0x200000000518 = 0x20;
    *(uint32_t*)0x20000000051c = 0;
    *(uint32_t*)0x200000000520 = 0;
    *(uint64_t*)0x200000000524 = 0;
    *(uint64_t*)0x20000000052c = 0;
    *(uint64_t*)0x200000000534 = 0;
    *(uint64_t*)0x20000000053c = 0;
    *(uint64_t*)0x200000000544 = 0x1000;
    *(uint64_t*)0x200000000198 = 0;
    *(uint64_t*)0x2000000001a0 = 0;
    *(uint64_t*)0x2000000001a8 = 0;
    syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc0306201,
            /*arg=*/0x200000000180ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  do_sandbox_none();
  return 0;
}