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

#ifndef __NR_mmap
#define __NR_mmap 9
#endif
#ifndef __NR_socket
#define __NR_socket 41
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 16
#endif
#ifndef __NR_sendto
#define __NR_sendto 44
#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 || e == EAGAIN) ? 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 real_uid;
static int real_gid;
static int epid;
static bool etun;
__attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20];

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);

  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    close(fd);
    return false;
  }
  close(fd);
  return true;
}

static int namespace_sandbox_proc(void* arg)
{
  sandbox_common();

  write_file("/proc/self/setgroups", "deny");
  if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid))
    fail("write of /proc/self/uid_map failed");
  if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid))
    fail("write of /proc/self/gid_map failed");

  if (mkdir("./syz-tmp", 0777))
    fail("mkdir(syz-tmp) failed");
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    fail("mount(tmpfs) failed");
  if (mkdir("./syz-tmp/newroot", 0777))
    fail("mkdir failed");
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    fail("mkdir failed");
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL,
            MS_BIND | MS_REC | MS_PRIVATE, NULL))
    fail("mount(dev) failed");
  if (mkdir("./syz-tmp/pivot", 0777))
    fail("mkdir failed");
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    debug("pivot_root failed");
    if (chdir("./syz-tmp"))
      fail("chdir failed");
  } else {
    if (chdir("/"))
      fail("chdir failed");
    if (umount2("./pivot", MNT_DETACH))
      fail("umount failed");
  }
  if (chroot("./newroot"))
    fail("chroot failed");
  if (chdir("/"))
    fail("chdir failed");

  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    fail("capget failed");
  cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE);
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    fail("capset failed");

  loop();
  doexit(1);
}

static int do_sandbox_namespace(int executor_pid, bool enable_tun)
{
  real_uid = getuid();
  real_gid = getgid();
  epid = executor_pid;
  etun = enable_tun;
  mprotect(sandbox_stack, 4096, PROT_NONE);
  return clone(
      namespace_sandbox_proc,
      &sandbox_stack[sizeof(sandbox_stack) - 64],
      CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWUTS | CLONE_NEWNET, NULL);
}

long r[67];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = execute_syscall(__NR_mmap, 0x2057b000ul, 0x2000ul, 0x3ul,
                         0x32ul, 0xfffffffffffffffful, 0x0ul, 0, 0, 0);
  r[1] = execute_syscall(__NR_socket, 0xaul, 0x1ul, 0x84ul, 0, 0, 0, 0,
                         0, 0);
  NONFAILING(*(uint8_t*)0x2057cfb0 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb1 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb2 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb3 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb4 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb5 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb6 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb7 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb8 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfb9 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfba = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfbb = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfbc = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfbd = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfbe = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfbf = (uint8_t)0x0);
  NONFAILING(*(uint64_t*)0x2057cfc0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2057cfc8 = (uint64_t)0x100000000000000);
  NONFAILING(*(uint8_t*)0x2057cfd0 = (uint8_t)0xfd);
  NONFAILING(*(uint8_t*)0x2057cfd1 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd2 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd3 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd4 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd5 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd6 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd7 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd8 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfd9 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfda = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfdb = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfdc = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfdd = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfde = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x2057cfdf = (uint8_t)0xaa);
  NONFAILING(*(uint32_t*)0x2057cfe0 = (uint32_t)0x4);
  NONFAILING(*(uint16_t*)0x2057cfe4 = (uint16_t)0x4000000000);
  NONFAILING(*(uint16_t*)0x2057cfe6 = (uint16_t)0x7);
  NONFAILING(*(uint32_t*)0x2057cfe8 = (uint32_t)0x100);
  NONFAILING(*(uint64_t*)0x2057cff0 = (uint64_t)0x80000001);
  NONFAILING(*(uint32_t*)0x2057cff8 = (uint32_t)0x40000000);
  NONFAILING(*(uint32_t*)0x2057cffc = (uint32_t)0x9);
  r[43] = execute_syscall(__NR_ioctl, r[1], 0x890bul, 0x2057cfb0ul, 0,
                          0, 0, 0, 0, 0);
  r[44] = execute_syscall(__NR_mmap, 0x20000000ul, 0xfd0000ul, 0x1ul,
                          0x32ul, 0xfffffffffffffffful, 0x0ul, 0, 0, 0);
  r[45] = execute_syscall(__NR_socket, 0xaul, 0x803ul, 0xfful, 0, 0, 0,
                          0, 0, 0);
  NONFAILING(*(uint16_t*)0x205a0fe4 = (uint16_t)0xa);
  NONFAILING(*(uint16_t*)0x205a0fe6 = (uint16_t)0x234e);
  NONFAILING(*(uint32_t*)0x205a0fe8 = (uint32_t)0x6);
  NONFAILING(*(uint8_t*)0x205a0fec = (uint8_t)0xfd);
  NONFAILING(*(uint8_t*)0x205a0fed = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0fee = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0fef = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff0 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff1 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff2 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff3 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff4 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff5 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff6 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff7 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff8 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ff9 = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ffa = (uint8_t)0x0);
  NONFAILING(*(uint8_t*)0x205a0ffb = (uint8_t)0xbb);
  NONFAILING(*(uint32_t*)0x205a0ffc = (uint32_t)0x1);
  r[66] = execute_syscall(__NR_sendto, r[45], 0x20fd0fd0ul, 0x0ul,
                          0x800ul, 0x205a0fe4ul, 0x1cul, 0, 0, 0);
}
int main()
{
  setup_main_process();
  int pid = do_sandbox_namespace(0, false);
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}