// https://syzkaller.appspot.com/bug?id=2b6a5e7ed9c189aadc974fc5ff168b131c005947
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>

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

static void fail(const char* msg, ...)
{
  int e = errno;
  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);
}

#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;
};

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

static 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);
}

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

static __thread int skip_segv;
static __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)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  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);

  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);                       \
  }

static void use_temporary_dir()
{
  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 = 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);

#define CLONE_NEWCGROUP 0x02000000

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_NEWCGROUP);
  unshare(CLONE_NEWNET);
  unshare(CLONE_NEWUTS);
  unshare(CLONE_SYSVSEM);
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  unshare(CLONE_NEWPID);
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();

  loop();
  doexit(1);
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

long r[3];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    NONFAILING(*(uint64_t*)0x204ecfd0 = 0);
    NONFAILING(*(uint64_t*)0x204ecfd8 = 0);
    NONFAILING(*(uint64_t*)0x204ecfe0 = 0x204ec000);
    NONFAILING(*(uint64_t*)0x204ecfe8 = 0);
    NONFAILING(*(uint64_t*)0x204ecff0 = 0);
    NONFAILING(*(uint64_t*)0x204ecff8 = 0x204ecfff);
    syscall(__NR_ioctl, -1, 0xc0306201, 0x204ecfd0);
    break;
  case 2:
    NONFAILING(memcpy((void*)0x203c4ff7, "/dev/kvm", 9));
    r[0] = syscall(__NR_openat, 0xffffffffffffff9c, 0x203c4ff7, 0, 0);
    break;
  case 3:
    r[1] = syscall(__NR_ioctl, r[0], 0xae01, 0);
    break;
  case 4:
    r[2] = syscall(__NR_ioctl, r[1], 0xae41, 0);
    break;
  case 5:
    syscall(__NR_clock_gettime, 0, 0x20000000);
    break;
  case 6:
    NONFAILING(*(uint32_t*)0x20001000 = 0x10005);
    NONFAILING(*(uint32_t*)0x20001004 = 0);
    NONFAILING(*(uint64_t*)0x20001008 = 0);
    NONFAILING(*(uint64_t*)0x20001010 = 0x2000);
    NONFAILING(*(uint64_t*)0x20001018 = 0x20000000);
    syscall(__NR_ioctl, r[1], 0x4020ae46, 0x20001000);
    break;
  case 7:
    syscall(__NR_ioctl, r[2], 0xaeb7);
    break;
  case 8:
    syscall(__NR_ioctl, r[2], 0xae80, 0);
    break;
  case 9:
    syscall(__NR_ioctl, r[2], 0xae80, 0);
    break;
  case 10:
    syscall(__NR_fcntl, -1, 0x407, 5);
    break;
  case 11:
    NONFAILING(*(uint8_t*)0x20025000 = 0xaa);
    NONFAILING(*(uint8_t*)0x20025001 = 0xaa);
    NONFAILING(*(uint8_t*)0x20025002 = 0xaa);
    NONFAILING(*(uint8_t*)0x20025003 = 0xaa);
    NONFAILING(*(uint8_t*)0x20025004 = 0xaa);
    NONFAILING(*(uint8_t*)0x20025005 = 0 + procid * 1);
    NONFAILING(*(uint8_t*)0x20025006 = 0xbb);
    NONFAILING(*(uint8_t*)0x20025007 = 0xbb);
    NONFAILING(*(uint8_t*)0x20025008 = 0xbb);
    NONFAILING(*(uint8_t*)0x20025009 = 0xbb);
    NONFAILING(*(uint8_t*)0x2002500a = 0xbb);
    NONFAILING(*(uint8_t*)0x2002500b = 0 + procid * 1);
    NONFAILING(*(uint16_t*)0x2002500c = htobe16(0x800));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2002500e, 6, 0, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2002500e, 4, 4, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2002500f, 0, 0, 2));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2002500f, 0, 2, 6));
    NONFAILING(*(uint16_t*)0x20025010 = htobe16(0x2c));
    NONFAILING(*(uint16_t*)0x20025012 = htobe16(0x64 + procid * 4));
    NONFAILING(*(uint16_t*)0x20025014 = htobe16(0));
    NONFAILING(*(uint8_t*)0x20025016 = 0);
    NONFAILING(*(uint8_t*)0x20025017 = 4);
    NONFAILING(*(uint16_t*)0x20025018 = 0);
    NONFAILING(*(uint8_t*)0x2002501a = 0xac);
    NONFAILING(*(uint8_t*)0x2002501b = 0x14);
    NONFAILING(*(uint8_t*)0x2002501c = 0 + procid * 1);
    NONFAILING(*(uint8_t*)0x2002501d = 0xbb);
    NONFAILING(*(uint8_t*)0x2002501e = 0xac);
    NONFAILING(*(uint8_t*)0x2002501f = 0x14);
    NONFAILING(*(uint8_t*)0x20025020 = 0 + procid * 1);
    NONFAILING(*(uint8_t*)0x20025021 = 0xaa);
    NONFAILING(*(uint8_t*)0x20025022 = 0);
    NONFAILING(*(uint8_t*)0x20025023 = 2);
    NONFAILING(*(uint16_t*)0x20025026 = htobe16(0x4e20 + procid * 4));
    NONFAILING(*(uint16_t*)0x20025028 = htobe16(0x4e20 + procid * 4));
    NONFAILING(*(uint32_t*)0x2002502a = 0x42424242);
    NONFAILING(*(uint32_t*)0x2002502e = 0x42424242);
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20025032, 0, 0, 1));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20025032, 0, 1, 3));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20025032, 5, 4, 4));
    NONFAILING(*(uint8_t*)0x20025033 = 0);
    NONFAILING(*(uint16_t*)0x20025034 = htobe16(0));
    NONFAILING(*(uint16_t*)0x20025036 = 0);
    NONFAILING(*(uint16_t*)0x20025038 = htobe16(0));
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x2002501a, 4));
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x2002501e, 4));
    uint16_t csum_1_chunk_2 = 0x600;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
    uint16_t csum_1_chunk_3 = 0x1400;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20025026, 20));
    NONFAILING(*(uint16_t*)0x20025036 = csum_inet_digest(&csum_1));
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    NONFAILING(csum_inet_update(&csum_2, (const uint8_t*)0x2002500e, 24));
    NONFAILING(*(uint16_t*)0x20025018 = csum_inet_digest(&csum_2));
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(12);
  collide = 1;
  execute(12);
}

int main()
{
  char* cwd = get_current_dir_name();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        if (chdir(cwd))
          fail("failed to chdir");
        use_temporary_dir();
        int pid = do_sandbox_none(procid, false);
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}