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

#ifndef __NR_mmap
#define __NR_mmap 9
#endif
#ifndef __NR_rt_sigprocmask
#define __NR_rt_sigprocmask 14
#endif
#ifndef __NR_timer_create
#define __NR_timer_create 222
#endif
#ifndef __NR_getsockopt
#define __NR_getsockopt 55
#endif
#ifndef __NR_getpid
#define __NR_getpid 39
#endif
#ifndef __NR_gettid
#define __NR_gettid 186
#endif
#ifndef __NR_timer_settime
#define __NR_timer_settime 223
#endif
#ifndef __NR_rt_tgsigqueueinfo
#define __NR_rt_tgsigqueueinfo 297
#endif
#ifndef __NR_rt_sigtimedwait
#define __NR_rt_sigtimedwait 128
#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/kvm.h>
#include <linux/sched.h>

#include <arpa/inet.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.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;                                          \
  }

struct csum_inet {
  uint32_t acc;
};

void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                      size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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

  sandbox_common();

  const int nobody = 65534;
  if (setgroups(0, NULL))
    fail("failed to setgroups");
  if (syscall(SYS_setresgid, nobody, nobody, nobody))
    fail("failed to setresgid");
  if (syscall(SYS_setresuid, nobody, nobody, nobody))
    fail("failed to setresuid");

  prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);

  loop();
  doexit(1);
}

long r[39];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = execute_syscall(__NR_mmap, 0x20000000ul, 0x1c000ul, 0x3ul,
                         0x32ul, 0xfffffffffffffffful, 0x0ul, 0, 0, 0);
  NONFAILING(*(uint64_t*)0x20003000 = (uint64_t)0xfffffffffffff051);
  r[2] = execute_syscall(__NR_rt_sigprocmask, 0x2ul, 0x20003000ul,
                         0x20011ff8ul, 0x8ul, 0, 0, 0, 0, 0);
  r[3] = execute_syscall(__NR_getpid, 0, 0, 0, 0, 0, 0, 0, 0, 0);
  r[4] = execute_syscall(__NR_gettid, 0, 0, 0, 0, 0, 0, 0, 0, 0);
  NONFAILING(*(uint64_t*)0x2001afb0 = (uint64_t)0x0);
  NONFAILING(*(uint32_t*)0x2001afb8 = (uint32_t)0x8);
  NONFAILING(*(uint32_t*)0x2001afbc = (uint32_t)0x2);
  NONFAILING(*(uint64_t*)0x2001afc0 = (uint64_t)0x7f);
  NONFAILING(*(uint64_t*)0x2001afc8 = (uint64_t)0xbd);
  NONFAILING(*(uint64_t*)0x2001afd0 = (uint64_t)0x86);
  NONFAILING(*(uint64_t*)0x2001afd8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x2001afe0 = (uint64_t)0x100);
  NONFAILING(*(uint64_t*)0x2001afe8 = (uint64_t)0x4);
  NONFAILING(*(uint64_t*)0x2001aff0 = (uint64_t)0xffff);
  NONFAILING(*(uint64_t*)0x2001aff8 = (uint64_t)0x7);
  r[16] = execute_syscall(__NR_timer_create, 0x3ul, 0x2001afb0ul,
                          0x2000b000ul, 0, 0, 0, 0, 0, 0);
  if (r[16] != -1)
    NONFAILING(r[17] = *(uint32_t*)0x2000b000);
  NONFAILING(*(uint32_t*)0x2000b000 = (uint32_t)0x0);
  NONFAILING(*(uint16_t*)0x2000b004 = (uint16_t)0x3f7d);
  NONFAILING(*(uint16_t*)0x2000b006 = (uint16_t)0x21);
  NONFAILING(*(uint64_t*)0x2000b008 = (uint64_t)0x1);
  NONFAILING(*(uint64_t*)0x2000b010 = (uint64_t)0x2);
  NONFAILING(*(uint32_t*)0x2001b000 = (uint32_t)0x18);
  r[24] =
      execute_syscall(__NR_getsockopt, 0xfffffffffffffffful, 0x84ul,
                      0x73ul, 0x2000b000ul, 0x2001b000ul, 0, 0, 0, 0);
  NONFAILING(*(uint64_t*)0x20011fe0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x20011fe8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x20011ff0 = (uint64_t)0x77359400);
  NONFAILING(*(uint64_t*)0x20011ff8 = (uint64_t)0x0);
  r[29] = execute_syscall(__NR_timer_settime, r[17], 0x1ul,
                          0x20011fe0ul, 0x2001afe0ul, 0, 0, 0, 0, 0);
  NONFAILING(*(uint32_t*)0x2000aff0 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x2000aff4 = (uint32_t)0x3);
  NONFAILING(*(uint32_t*)0x2000aff8 = (uint32_t)0x10001);
  NONFAILING(*(uint32_t*)0x2000affc = (uint32_t)0x3d9d);
  r[34] = execute_syscall(__NR_rt_tgsigqueueinfo, r[3], r[4], 0x32ul,
                          0x2000aff0ul, 0, 0, 0, 0, 0);
  NONFAILING(*(uint64_t*)0x20012000 = (uint64_t)0xfffffffffffffffc);
  NONFAILING(*(uint64_t*)0x20014ff0 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x20014ff8 = (uint64_t)0x98967c);
  r[38] =
      execute_syscall(__NR_rt_sigtimedwait, 0x20012000ul, 0x20015ff0ul,
                      0x20014ff0ul, 0x8ul, 0, 0, 0, 0, 0);
}
int main()
{
  setup_main_process();
  int pid = do_sandbox_setuid(0, false);
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}