// https://syzkaller.appspot.com/bug?id=632e462853f2cf2644dea8c3f5ce98185f33da66
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <errno.h>
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void exitf(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  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);
  }
  doexit(sig);
  for (;;) {
  }
}

static void install_segv_handler()
{
  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 uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 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);

#define CLONE_NEWCGROUP 0x02000000

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_NEWCGROUP);
  unshare(CLONE_NEWNET);
  unshare(CLONE_NEWUTS);
  unshare(CLONE_SYSVSEM);
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  unshare(CLONE_NEWPID);
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();

  loop();
  doexit(1);
}

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) {
      exitf("opendir(%s) failed due to NOFILE, exiting");
    }
    exitf("opendir(%s) failed", dir);
  }
  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))
      exitf("lstat(%s) failed", filename);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exitf("unlink(%s) failed", filename);
      if (umount2(filename, MNT_DETACH))
        exitf("umount(%s) failed", filename);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exitf("umount(%s) failed", dir);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exitf("rmdir(%s) failed", dir);
  }
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[256];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      fail("failed to mkdir");
    int pid = fork();
    if (pid < 0)
      fail("loop fork failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      if (chdir(cwdbuf))
        fail("failed to chdir");
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
    remove_dir(cwdbuf);
  }
}

long r[42];
void test()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xf7c000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  r[1] = syscall(__NR_socket, 0x26ul, 0x5ul, 0x0ul);
  NONFAILING(*(uint16_t*)0x20590fa8 = (uint16_t)0x26);
  NONFAILING(memcpy(
      (void*)0x20590faa,
      "\x73\x6b\x63\x69\x70\x68\x65\x72\x00\x00\x00\x00\x00\x00", 14));
  NONFAILING(*(uint32_t*)0x20590fb8 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x20590fbc = (uint32_t)0x0);
  NONFAILING(memcpy((void*)0x20590fc0,
                    "\x63\x68\x61\x63\x68\x61\x32\x30\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00",
                    64));
  r[7] = syscall(__NR_bind, r[1], 0x20590fa8ul, 0x58ul);
  NONFAILING(memcpy((void*)0x201ec000,
                    "\x0a\x07\x75\xb0\xd5\xe3\x83\xe5\xb3\xb6\x0c\xed"
                    "\x5c\x54\xdb\xb7\x29\x5d\xf0\xdf\x82\x17\xad\x40"
                    "\x00\x00\x00\x00\x00\x00\x00\xe6",
                    32));
  r[9] = syscall(__NR_setsockopt, r[1], 0x117ul, 0x1ul, 0x201ec000ul,
                 0x20ul);
  r[10] = syscall(__NR_accept, r[1], 0x0ul, 0x0ul);
  r[11] = syscall(__NR_io_setup, 0x1ul, 0x20868000ul);
  if (r[11] != -1)
    NONFAILING(r[12] = *(uint64_t*)0x20868000);
  r[13] = syscall(__NR_eventfd, 0x9ul);
  NONFAILING(*(uint64_t*)0x20738000 = (uint64_t)0x20f73fc0);
  NONFAILING(*(uint64_t*)0x20738008 = (uint64_t)0x208e8fc0);
  NONFAILING(*(uint64_t*)0x20f73fc0 = (uint64_t)0x0);
  NONFAILING(*(uint32_t*)0x20f73fc8 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x20f73fcc = (uint32_t)0x0);
  NONFAILING(*(uint16_t*)0x20f73fd0 = (uint16_t)0x0);
  NONFAILING(*(uint16_t*)0x20f73fd2 = (uint16_t)0x9);
  NONFAILING(*(uint32_t*)0x20f73fd4 = r[10]);
  NONFAILING(*(uint64_t*)0x20f73fd8 = (uint64_t)0x2079a000);
  NONFAILING(*(uint64_t*)0x20f73fe0 = (uint64_t)0x19);
  NONFAILING(*(uint64_t*)0x20f73fe8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x20f73ff0 = (uint64_t)0x0);
  NONFAILING(*(uint32_t*)0x20f73ff8 = (uint32_t)0x1);
  NONFAILING(*(uint32_t*)0x20f73ffc = r[13]);
  NONFAILING(memcpy((void*)0x2079a000, "\x16\x80\xb5\x6c\x88\xe4\x52"
                                       "\xf0\xc9\x0a\xfe\xde\x60\x61"
                                       "\xa2\x0a\x17\x1f\xd8\x6d\x1c"
                                       "\x7b\xb9\xe1\xc5",
                    25));
  NONFAILING(*(uint64_t*)0x208e8fc0 = (uint64_t)0x0);
  NONFAILING(*(uint32_t*)0x208e8fc8 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x208e8fcc = (uint32_t)0x0);
  NONFAILING(*(uint16_t*)0x208e8fd0 = (uint16_t)0x8);
  NONFAILING(*(uint16_t*)0x208e8fd2 = (uint16_t)0x200000000000001);
  NONFAILING(*(uint32_t*)0x208e8fd4 = r[10]);
  NONFAILING(*(uint64_t*)0x208e8fd8 = (uint64_t)0x20435035);
  NONFAILING(*(uint64_t*)0x208e8fe0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x208e8fe8 = (uint64_t)0x100000000);
  NONFAILING(*(uint64_t*)0x208e8ff0 = (uint64_t)0x0);
  NONFAILING(*(uint32_t*)0x208e8ff8 = (uint32_t)0x1);
  NONFAILING(*(uint32_t*)0x208e8ffc = (uint32_t)0xffffffffffffffff);
  r[41] = syscall(__NR_io_submit, r[12], 0x2ul, 0x20738000ul);
}

int main()
{
  install_segv_handler();
  use_temporary_dir();
  int pid = do_sandbox_none(0, false);
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}