// https://syzkaller.appspot.com/bug?id=90a4811c99d6a2df7b252971b754612ca632894d
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <pwd.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/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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_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 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 __attribute__((noinline)) remove_dir(const char* dir)
{
  DIR* dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EACCES) {
      if (rmdir(dir))
        exit(1);
      return;
    }
    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);
    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);
}

#define __syscall syscall

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 = 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);
      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;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  NONFAILING(*(uint64_t*)0x20000008 = 0);
  NONFAILING(*(uint64_t*)0x20000010 = 0x10000000000001);
  syscall(SYS_ioctl, -1, 0x80185760ul, 0x20000000ul);
  NONFAILING(*(uint32_t*)0x200000c0 = 0);
  NONFAILING(*(uint32_t*)0x200000c4 = 0);
  NONFAILING(*(uint32_t*)0x200000c8 = -1);
  NONFAILING(*(uint32_t*)0x200000cc = 0);
  NONFAILING(memcpy((void*)0x200000d0,
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf2\xff\xff\xff"
                    "\xff\xff\xff\xff\x40\x00",
                    20));
  NONFAILING(*(uint32_t*)0x200000e4 = 0);
  NONFAILING(*(uint32_t*)0x200000e8 = 0);
  syscall(SYS_ioctl, -1, 0x802c7414ul, 0x200000c0ul);
  NONFAILING(*(uint16_t*)0x200000c0 = 0x18e6);
  NONFAILING(*(uint8_t*)0x200000c2 = 7);
  NONFAILING(*(uint32_t*)0x200000c4 = 0x4e22 + procid * 4);
  syscall(SYS_connect, -1, 0x200000c0ul, 8ul);
  NONFAILING(*(uint32_t*)0x20000140 = -1);
  NONFAILING(*(uint32_t*)0x20000144 = 0);
  NONFAILING(*(uint32_t*)0x20000148 = 0);
  NONFAILING(*(uint32_t*)0x2000014c = 0);
  NONFAILING(memcpy((void*)0x20000150,
                    "\x01\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x7f\x00"
                    "\x00\x00\x00\x00\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000164 = 0);
  NONFAILING(*(uint32_t*)0x20000168 = 0);
  syscall(SYS_ioctl, -1, 0x802c7416ul, 0x20000140ul);
  syscall(SYS_mprotect, 0x20000000ul, 0x800000ul, 5ul);
  res = syscall(SYS_socket, 0x18ul, 3ul, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(memcpy((void*)0x20000140,
                    "\xeb\xff\xcb\xff\x13\xb9\xfd\x81\x2e\xaa\x4e\x71\x30\x48"
                    "\xe6\x99\x31\x92\x96\x48",
                    20));
  syscall(SYS_setsockopt, r[0], 0x29, 0xc, 0x20000140ul, 0x14ul);
  res = syscall(SYS_socket, 0x18ul, 1ul, 0);
  if (res != -1)
    r[1] = res;
  syscall(SYS_close, r[1]);
  res = syscall(SYS_socket, 0x18ul, 3ul, 0x85);
  if (res != -1)
    r[2] = res;
  NONFAILING(memcpy((void*)0x20000000,
                    "\xeb\xff\xcb\xff\x13\xb9\xfd\x81\x2e\xaa\x4e\x71\x30\x48"
                    "\xe6\x99\x31\x92\x96\x48",
                    20));
  syscall(SYS_setsockopt, r[2], 0x29, 0x2e, 0x20000000ul, 0x14ul);
  NONFAILING(*(uint16_t*)0x200000c0 = 0);
  NONFAILING(*(uint8_t*)0x200000c2 = 7);
  NONFAILING(*(uint32_t*)0x200000c4 = 0);
  syscall(SYS_connect, r[1], 0x200000c0ul, 0x1cul);
  syscall(SYS_write, r[2], 0ul, 0ul);
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul);
  install_segv_handler();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}