// autogenerated by syzkaller (http://github.com/google/syzkaller)

#ifndef __NR_sendmsg
#define __NR_sendmsg 46
#endif
#ifndef __NR_mmap
#define __NR_mmap 9
#endif
#ifndef __NR_socket
#define __NR_socket 41
#endif
#ifndef __NR_connect
#define __NR_connect 42
#endif

#define _GNU_SOURCE

#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>

#include <linux/capability.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <linux/kvm.h>
#include <linux/sched.h>
#include <net/if_arp.h>

#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

const int kFailStatus = 67;
const int kErrorStatus = 68;
const int kRetryStatus = 69;

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

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

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

static int flag_debug;

void debug(const char* msg, ...)
{
  if (!flag_debug)
    return;
  va_list args;
  va_start(args, msg);
  vfprintf(stdout, msg, args);
  va_end(args);
  fflush(stdout);
}

__thread int skip_segv;
__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)) {
    debug("SIGSEGV on %p, skipping\n", addr);
    _longjmp(segv_env, 1);
  }
  debug("SIGSEGV on %p, exiting\n", addr);
  doexit(sig);
  for (;;) {
  }
}

static void install_segv_handler()
{
  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(...)                                                \
  {                                                                    \
    __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);               \
  }

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                          \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)              \
  if ((bf_off) == 0 && (bf_len) == 0) {                                \
    *(type*)(addr) = (type)(val);                                      \
  } else {                                                             \
    type new_val = *(type*)(addr);                                     \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));             \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);  \
    *(type*)(addr) = new_val;                                          \
  }

static uintptr_t execute_syscall(int nr, uintptr_t a0, uintptr_t a1,
                                 uintptr_t a2, uintptr_t a3,
                                 uintptr_t a4, uintptr_t a5,
                                 uintptr_t a6, uintptr_t a7,
                                 uintptr_t a8)
{
  switch (nr) {
  default:
    return syscall(nr, a0, a1, a2, a3, a4, a5);
  }
}

static void setup_main_process()
{
  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);
  install_segv_handler();

  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 = 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);

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_IO);
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  int pid = fork();
  if (pid)
    return pid;

  sandbox_common();

  loop();
  doexit(1);
}

long r[30];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] =
        execute_syscall(__NR_mmap, 0x20000000ul, 0x1f2000ul, 0x3ul,
                        0x32ul, 0xfffffffffffffffful, 0x0ul, 0, 0, 0);
    break;
  case 1:
    r[1] = execute_syscall(__NR_socket, 0x1aul, 0x2ul, 0x1ul, 0, 0, 0,
                           0, 0, 0);
    break;
  case 2:
    NONFAILING(*(uint16_t*)0x20000000 = (uint16_t)0x1f);
    NONFAILING(*(uint8_t*)0x20000002 = (uint8_t)0x8002000004);
    NONFAILING(*(uint8_t*)0x20000003 = (uint8_t)0x3);
    NONFAILING(*(uint8_t*)0x20000004 = (uint8_t)0x3);
    NONFAILING(*(uint8_t*)0x20000005 = (uint8_t)0xfff);
    NONFAILING(*(uint8_t*)0x20000006 = (uint8_t)0x401);
    NONFAILING(*(uint8_t*)0x20000007 = (uint8_t)0xef);
    NONFAILING(*(uint8_t*)0x20000008 = (uint8_t)0x9);
    r[10] = execute_syscall(__NR_connect, r[1], 0x20000000ul, 0xaul, 0,
                            0, 0, 0, 0, 0);
    break;
  case 3:
    NONFAILING(*(uint64_t*)0x20003000 = (uint64_t)0x20000000);
    NONFAILING(*(uint32_t*)0x20003008 = (uint32_t)0x60);
    NONFAILING(*(uint64_t*)0x20003010 = (uint64_t)0x20008000);
    NONFAILING(*(uint64_t*)0x20003018 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20003020 = (uint64_t)0x20007000);
    NONFAILING(*(uint64_t*)0x20003028 = (uint64_t)0x10);
    NONFAILING(*(uint32_t*)0x20003030 = (uint32_t)0x5);
    NONFAILING(*(uint16_t*)0x20000000 = (uint16_t)0x27);
    NONFAILING(*(uint32_t*)0x20000004 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20000008 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2000000c = (uint32_t)0x0);
    NONFAILING(*(uint8_t*)0x20000010 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20000011 = (uint8_t)0x0);
    NONFAILING(memcpy((void*)0x20000012,
                      "\x4e\xa6\xf0\xe3\x26\x38\x41\x0f\x61\xc3\x84\x5a"
                      "\xd3\xe8\x12\x96\xe2\x97\x1a\x49\xc7\x07\x55\xb5"
                      "\x82\x0c\x91\x5b\xe8\xe3\xa2\x1e\x49\x17\x62\x02"
                      "\x27\x36\xcd\x99\x61\x46\xb6\xa2\x93\x9e\xee\x01"
                      "\xc9\xcb\xf2\xeb\x94\x9c\x90\xc2\x85\x56\x30\xea"
                      "\x2a\x71\xf9",
                      63));
    NONFAILING(*(uint64_t*)0x20000058 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20007000 = (uint64_t)0x10);
    NONFAILING(*(uint32_t*)0x20007008 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2000700c = (uint32_t)0x0);
    r[29] = execute_syscall(__NR_sendmsg, r[1], 0x20003000ul, 0x40880ul,
                            0, 0, 0, 0, 0, 0);
    break;
  }
  return 0;
}

void loop()
{
  long i;
  pthread_t th[8];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 4; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(10000);
  }
  for (i = 0; i < 4; i++) {
    pthread_create(&th[4 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(100000);
}

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