// https://syzkaller.appspot.com/bug?id=1aa3f789d356bf04644bcef632bf8c2373398ba2
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

unsigned long long procid;

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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);
}

static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  dp = opendir(dir);
  if (dp == NULL)
    exit(1);
  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))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename))
      exit(1);
  }
  closedir(dp);
  if (rmdir(dir))
    exit(1);
}

static void sandbox_common()
{
  if (setsid() == -1)
    exit(1);
  struct rlimit 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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  return 0;
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter;
  for (iter = 0;; 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);
      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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

#ifndef SYS___clone
#define SYS___clone 287
#endif
#ifndef SYS_geteuid
#define SYS_geteuid 25
#endif
#ifndef SYS_getppid
#define SYS_getppid 39
#endif
#ifndef SYS_getuid
#define SYS_getuid 24
#endif
#ifndef SYS_mmap
#define SYS_mmap 197
#endif
#ifndef SYS_msgctl
#define SYS_msgctl 444
#endif
#ifndef SYS_setpgid
#define SYS_setpgid 82
#endif
#ifndef SYS_socketpair
#define SYS_socketpair 135
#endif
#ifndef SYS_wait4
#define SYS_wait4 449
#endif

uint64_t r[4] = {0x0, 0x0, 0x0, 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(SYS___clone, 0ul, 0x20000200ul);
  if (res != -1)
    r[0] = res;
  syscall(SYS_wait4, r[0], 0x20000440ul, 1ul, 0ul);
  res = syscall(SYS_geteuid);
  if (res != -1)
    r[1] = res;
  res = syscall(SYS_getuid);
  if (res != -1)
    r[2] = res;
  syscall(SYS_setpgid, 0, 0);
  res = syscall(SYS_getppid);
  if (res != -1)
    r[3] = res;
  syscall(SYS_socketpair, 0x1ful, 1ul, 8, 0x20000100ul);
  syscall(SYS_setpgid, r[3], 0);
  *(uint32_t*)0x20000080 = 0x80000001;
  *(uint32_t*)0x20000084 = r[1];
  *(uint32_t*)0x20000088 = 0;
  *(uint32_t*)0x2000008c = r[2];
  *(uint32_t*)0x20000090 = 0;
  *(uint32_t*)0x20000094 = 0x50;
  *(uint16_t*)0x20000098 = 2;
  *(uint16_t*)0x2000009a = 0;
  *(uint64_t*)0x200000a0 = 0;
  *(uint64_t*)0x200000a8 = 0;
  *(uint64_t*)0x200000b0 = 8;
  *(uint64_t*)0x200000b8 = 0x10001;
  *(uint32_t*)0x200000c0 = 0;
  *(uint32_t*)0x200000c4 = r[3];
  *(uint64_t*)0x200000c8 = 4;
  *(uint64_t*)0x200000d0 = 0x40;
  *(uint64_t*)0x200000d8 = 7;
  *(uint64_t*)0x200000e0 = 0xec;
  *(uint64_t*)0x200000e8 = 0;
  *(uint64_t*)0x200000f0 = 0;
  syscall(SYS_msgctl, 0, 1ul, 0x20000080ul);
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}