// https://syzkaller.appspot.com/bug?id=d8a54d453b8e643b807a5c3c56728561f01c0fde
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <sys/types.h>

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

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 (sig == SIGBUS)
    valid = 1;
  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 reset_flags(const char* filename)
{
  struct stat st;
  if (lstat(filename, &st))
    exit(1);
  st.st_flags &= ~(SF_NOUNLINK | UF_NOUNLINK | SF_IMMUTABLE | UF_IMMUTABLE |
                   SF_APPEND | UF_APPEND);
  if (lchflags(filename, st.st_flags))
    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)) {
      if (errno == EPERM) {
        reset_flags(filename);
        reset_flags(dir);
        if (unlink(filename) == 0)
          continue;
      }
      exit(1);
    }
  }
  closedir(dp);
  while (rmdir(dir)) {
    if (errno == EPERM) {
      reset_flags(dir);
      if (rmdir(dir) == 0)
        break;
    }
    exit(1);
  }
}

static void sandbox_common()
{
  if (setsid() == -1)
    exit(1);
  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);
  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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(SYS_socket, 0x1cul, 1ul, 0x84);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint8_t*)0x20000180 = 0x1c);
  NONFAILING(*(uint8_t*)0x20000181 = 0x1c);
  NONFAILING(*(uint16_t*)0x20000182 = htobe16(0x4e22));
  NONFAILING(*(uint32_t*)0x20000184 = 0);
  NONFAILING(*(uint64_t*)0x20000188 = htobe64(0));
  NONFAILING(*(uint64_t*)0x20000190 = htobe64(1));
  NONFAILING(*(uint32_t*)0x20000198 = 0);
  syscall(SYS_bind, r[0], 0x20000180ul, 0x1cul);
  NONFAILING(*(uint8_t*)0x20000100 = 0x1c);
  NONFAILING(*(uint8_t*)0x20000101 = 0x1c);
  NONFAILING(*(uint16_t*)0x20000102 = htobe16(0x4e22));
  NONFAILING(*(uint32_t*)0x20000104 = 0);
  NONFAILING(*(uint64_t*)0x20000108 = htobe64(0));
  NONFAILING(*(uint64_t*)0x20000110 = htobe64(1));
  NONFAILING(*(uint32_t*)0x20000118 = 0);
  syscall(SYS_connect, r[0], 0x20000100ul, 0x1cul);
  NONFAILING(*(uint32_t*)0x20000140 = 0x100003);
  syscall(SYS_setsockopt, r[0], 0x84, 0x1b, 0x20000140ul, 4ul);
  NONFAILING(memcpy(
      (void*)0x200001c0,
      "\x8a\xc4\x40\x05\x4f\x1e\x1d\x62\xcc\xd8\x8c\xdd\x16\x52\x8b\x84\x38\xf5"
      "\xcb\x0e\xfa\x6b\x40\x99\xca\xc4\x66\x2a\x02\x9f\xdb\x82\xbb\xaa\xca\xbd"
      "\x36\xab\xdf\x52\x45\x5b\x6b\xe8\x53\xc7\xcc\x5a\x39\x52\x9c\xcc\x82\xc0"
      "\x30\x51\xcd\x81\x2f\x3a\xed\xe2\x18\xcd\x5a\xf6\xd2\x80\x46\x21\x50\x2c"
      "\x28\x78\x5c\xe4\x4c\x8e\xc8\xa4\x05\x39\x71\x91\x07\xd0\xdf\x77\xd5\xa5"
      "\xff\x5b\x43\x9e\xc1\xb3\x3d\xaa\x9f\x47\xf4\x05\x73\x3e\x10\x3e\x03\xf3"
      "\x91\xf3\x10\x3f\x25\x93\x1a\x92\xa4\x03\x64\x08\xce\x63\x82\x64\xc8\x1a"
      "\xa6\xc0\xf7\xa3\x85\x36\x0e\xa2\x74\x3e\x7b\x5f\x84\x79\xfe\x6b\xf3",
      143));
  syscall(SYS_sendto, r[0], 0x200001c0ul, 0x81a3d94ful, 0x81ul, 0ul, 0ul);
  syscall(SYS_shutdown, r[0], 0ul);
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
  install_segv_handler();
  use_temporary_dir();
  do_sandbox_none();
  return 0;
}