// https://syzkaller.appspot.com/bug?id=f036811a07cb0aabc485b4e75d2307bc3d0e4b40
// 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_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)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

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 = 0;
  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)) {
  }
  setup_binderfs();
  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)
{
  int i, call, thread;
  for (call = 0; call < 10; 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 (;;) {
      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;
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    memcpy((void*)0x20000080, "./file0\000", 8);
    syscall(__NR_mkdir, 0x20000080ul, 0ul);
    break;
  case 1:
    res = syscall(__NR_pipe2, 0x20000240ul, 0ul);
    if (res != -1) {
      r[0] = *(uint32_t*)0x20000240;
      r[1] = *(uint32_t*)0x20000244;
    }
    break;
  case 2:
    syscall(__NR_close, r[0]);
    break;
  case 3:
    syscall(__NR_socket, 0x10ul, 3ul, 6);
    break;
  case 4:
    memcpy((void*)0x20000200,
           "/sys/kernel/debug/binder/failed_transaction_log\000", 48);
    res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000200ul, 0ul, 0ul);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    memcpy((void*)0x20000180, "./file0\000", 8);
    memcpy((void*)0x200001c0, "9p\000", 3);
    memcpy((void*)0x20000280, "trans=fd,", 9);
    memcpy((void*)0x20000289, "rfdno", 5);
    *(uint8_t*)0x2000028e = 0x3d;
    sprintf((char*)0x2000028f, "0x%016llx", (long long)r[2]);
    *(uint8_t*)0x200002a1 = 0x2c;
    memcpy((void*)0x200002a2, "wfdno", 5);
    *(uint8_t*)0x200002a7 = 0x3d;
    sprintf((char*)0x200002a8, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x200002ba = 0x2c;
    memcpy((void*)0x200002bb, "fscache", 7);
    *(uint8_t*)0x200002c2 = 0x2c;
    memcpy((void*)0x200002c3, "dfltgid", 7);
    *(uint8_t*)0x200002ca = 0x3d;
    sprintf((char*)0x200002cb, "0x%016llx", (long long)0xee00);
    *(uint8_t*)0x200002dd = 0x2c;
    memcpy((void*)0x200002de, "access=user", 11);
    *(uint8_t*)0x200002e9 = 0x2c;
    memcpy((void*)0x200002ea, "access=client", 13);
    *(uint8_t*)0x200002f7 = 0x2c;
    memcpy((void*)0x200002f8, "hash", 4);
    *(uint8_t*)0x200002fc = 0x2c;
    memcpy((void*)0x200002fd, "fsuuid", 6);
    *(uint8_t*)0x20000303 = 0x3d;
    *(uint8_t*)0x20000304 = 0x61;
    *(uint8_t*)0x20000305 = 0x33;
    *(uint8_t*)0x20000306 = 0x39;
    *(uint8_t*)0x20000307 = 0x36;
    *(uint8_t*)0x20000308 = 0x62;
    *(uint8_t*)0x20000309 = 0x32;
    *(uint8_t*)0x2000030a = 0x65;
    *(uint8_t*)0x2000030b = 0x37;
    *(uint8_t*)0x2000030c = 0x2d;
    *(uint8_t*)0x2000030d = 0x65;
    *(uint8_t*)0x2000030e = 0x33;
    *(uint8_t*)0x2000030f = 0x33;
    *(uint8_t*)0x20000310 = 0x30;
    *(uint8_t*)0x20000311 = 0x2d;
    *(uint8_t*)0x20000312 = 0x62;
    *(uint8_t*)0x20000313 = 0x63;
    *(uint8_t*)0x20000314 = 0x34;
    *(uint8_t*)0x20000315 = 0x61;
    *(uint8_t*)0x20000316 = 0x2d;
    *(uint8_t*)0x20000317 = 0x38;
    *(uint8_t*)0x20000318 = 0x39;
    *(uint8_t*)0x20000319 = 0x33;
    *(uint8_t*)0x2000031a = 0x31;
    *(uint8_t*)0x2000031b = 0x2d;
    *(uint8_t*)0x2000031c = 0x63;
    *(uint8_t*)0x2000031d = 0x65;
    *(uint8_t*)0x2000031e = 0x63;
    *(uint8_t*)0x2000031f = 0x32;
    *(uint8_t*)0x20000320 = 0x34;
    *(uint8_t*)0x20000321 = 0x34;
    *(uint8_t*)0x20000322 = 0x31;
    *(uint8_t*)0x20000323 = 0x32;
    *(uint8_t*)0x20000324 = 0x2c;
    memcpy((void*)0x20000325, "appraise", 8);
    *(uint8_t*)0x2000032d = 0x2c;
    memcpy((void*)0x2000032e, "fowner>", 7);
    sprintf((char*)0x20000335, "%020llu", (long long)0);
    *(uint8_t*)0x20000349 = 0x2c;
    memcpy((void*)0x2000034a, "fsuuid", 6);
    *(uint8_t*)0x20000350 = 0x3d;
    *(uint8_t*)0x20000351 = 0x61;
    *(uint8_t*)0x20000352 = 0x32;
    *(uint8_t*)0x20000353 = 0x35;
    *(uint8_t*)0x20000354 = 0x65;
    *(uint8_t*)0x20000355 = 0x31;
    *(uint8_t*)0x20000356 = 0x61;
    *(uint8_t*)0x20000357 = 0x66;
    *(uint8_t*)0x20000358 = 0x34;
    *(uint8_t*)0x20000359 = 0x2d;
    *(uint8_t*)0x2000035a = 0x42;
    *(uint8_t*)0x2000035b = 0x31;
    *(uint8_t*)0x2000035c = 0x31;
    *(uint8_t*)0x2000035d = 0x38;
    *(uint8_t*)0x2000035e = 0x2d;
    *(uint8_t*)0x2000035f = 0x66;
    *(uint8_t*)0x20000360 = 0x61;
    *(uint8_t*)0x20000361 = 0x62;
    *(uint8_t*)0x20000362 = 0x33;
    *(uint8_t*)0x20000363 = 0x2d;
    *(uint8_t*)0x20000364 = 0x61;
    *(uint8_t*)0x20000365 = 0x37;
    *(uint8_t*)0x20000366 = 0x34;
    *(uint8_t*)0x20000367 = 0x63;
    *(uint8_t*)0x20000368 = 0x2d;
    *(uint8_t*)0x20000369 = 0x32;
    *(uint8_t*)0x2000036a = 0x66;
    *(uint8_t*)0x2000036b = 0x61;
    *(uint8_t*)0x2000036c = 0x32;
    *(uint8_t*)0x2000036d = 0x34;
    *(uint8_t*)0x2000036e = 0x37;
    *(uint8_t*)0x2000036f = 0x32;
    *(uint8_t*)0x20000370 = 0x33;
    *(uint8_t*)0x20000371 = 0x2c;
    memcpy((void*)0x20000372, "fsuuid", 6);
    *(uint8_t*)0x20000378 = 0x3d;
    *(uint8_t*)0x20000379 = 0x65;
    *(uint8_t*)0x2000037a = 0x66;
    *(uint8_t*)0x2000037b = 0x30;
    *(uint8_t*)0x2000037c = 0x36;
    *(uint8_t*)0x2000037d = 0x33;
    *(uint8_t*)0x2000037e = 0x36;
    *(uint8_t*)0x2000037f = 0x38;
    *(uint8_t*)0x20000380 = 0x61;
    *(uint8_t*)0x20000381 = 0x2d;
    *(uint8_t*)0x20000382 = 0x61;
    *(uint8_t*)0x20000383 = 0x61;
    *(uint8_t*)0x20000384 = 0x64;
    *(uint8_t*)0x20000385 = 0x30;
    *(uint8_t*)0x20000386 = 0x2d;
    *(uint8_t*)0x20000387 = 0x66;
    *(uint8_t*)0x20000388 = 0x35;
    *(uint8_t*)0x20000389 = 0x66;
    *(uint8_t*)0x2000038a = 0x39;
    *(uint8_t*)0x2000038b = 0x2d;
    *(uint8_t*)0x2000038c = 0x61;
    *(uint8_t*)0x2000038d = 0x39;
    *(uint8_t*)0x2000038e = 0x34;
    *(uint8_t*)0x2000038f = 0x30;
    *(uint8_t*)0x20000390 = 0x2d;
    *(uint8_t*)0x20000391 = 0x33;
    *(uint8_t*)0x20000392 = 0x64;
    *(uint8_t*)0x20000393 = 0x30;
    *(uint8_t*)0x20000394 = 0x64;
    *(uint8_t*)0x20000395 = 0x38;
    *(uint8_t*)0x20000396 = 0x37;
    *(uint8_t*)0x20000397 = 0x65;
    *(uint8_t*)0x20000398 = 0x34;
    *(uint8_t*)0x20000399 = 0x2c;
    *(uint8_t*)0x2000039a = 0;
    syscall(__NR_mount, 0ul, 0x20000180ul, 0x200001c0ul, 0x10ul, 0x20000280ul);
    break;
  case 6:
    res = syscall(__NR_epoll_create1, 0ul);
    if (res != -1)
      r[3] = res;
    break;
  case 7:
    memcpy((void*)0x20000040, "./file0\000", 8);
    memcpy((void*)0x200000c0, "9p\000", 3);
    memcpy((void*)0x20000b40, "trans=fd,", 9);
    memcpy((void*)0x20000b49, "rfdno", 5);
    *(uint8_t*)0x20000b4e = 0x3d;
    sprintf((char*)0x20000b4f, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x20000b61 = 0x2c;
    memcpy((void*)0x20000b62, "wfdno", 5);
    *(uint8_t*)0x20000b67 = 0x3d;
    sprintf((char*)0x20000b68, "0x%016llx", (long long)r[3]);
    *(uint8_t*)0x20000b7a = 0x2c;
    *(uint8_t*)0x20000b7b = 0x6b;
    syscall(__NR_mount, 0ul, 0x20000040ul, 0x200000c0ul, 0ul, 0x20000b40ul);
    break;
  case 8:
    *(uint32_t*)0x20000000 = 0;
    *(uint64_t*)0x20000004 = 0;
    syscall(__NR_epoll_ctl, r[3], 1ul, r[1], 0x20000000ul);
    break;
  case 9:
    memcpy((void*)0x20000040, "./file0\000", 8);
    memcpy((void*)0x200000c0, "9p\000", 3);
    memcpy((void*)0x20000b40, "trans=fd,", 9);
    memcpy((void*)0x20000b49, "rfdno", 5);
    *(uint8_t*)0x20000b4e = 0x3d;
    sprintf((char*)0x20000b4f, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x20000b61 = 0x2c;
    memcpy((void*)0x20000b62, "wfdno", 5);
    *(uint8_t*)0x20000b67 = 0x3d;
    sprintf((char*)0x20000b68, "0x%016llx", (long long)r[3]);
    *(uint8_t*)0x20000b7a = 0x2c;
    *(uint8_t*)0x20000b7b = 0x6b;
    syscall(__NR_mount, 0ul, 0x20000040ul, 0x200000c0ul, 0ul, 0x20000b40ul);
    break;
  }
}
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);
  do_sandbox_none();
  return 0;
}