// 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 <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <string.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);
}

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 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:
    syscall(__NR_socket, 2, 1, 0);
    break;
  case 2:
    NONFAILING(memcpy((void*)0x20002ff2, "/selinux/load", 14));
    syscall(__NR_openat, 0xffffffffffffff9c, 0x20002ff2, 2, 0);
    break;
  case 3:
    syscall(__NR_clone, 0x20000, 0x20000000, 0x20000000, 0x20000000,
            0x20000000);
    break;
  case 4:
    NONFAILING(memcpy((void*)0x20000000, "/dev/rfkill", 12));
    syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0x400, 0);
    break;
  case 5:
    NONFAILING(memcpy((void*)0x209a9000, "/dev/kvm", 9));
    r[0] = syscall(__NR_openat, 0xffffffffffffff9c, 0x209a9000, 0, 0);
    break;
  case 6:
    r[1] = syscall(__NR_ioctl, r[0], 0xae01, 0);
    break;
  case 7:
    r[2] = syscall(__NR_ioctl, r[1], 0xae41, 0);
    break;
  case 8:
    syscall(__NR_clock_gettime, 0, 0x20000000);
    break;
  case 9:
    NONFAILING(*(uint32_t*)0x20bf7000 = 0x10005);
    NONFAILING(*(uint32_t*)0x20bf7004 = 0);
    NONFAILING(*(uint64_t*)0x20bf7008 = 0);
    NONFAILING(*(uint64_t*)0x20bf7010 = 0x2000);
    NONFAILING(*(uint64_t*)0x20bf7018 = 0x20000000);
    syscall(__NR_ioctl, r[1], 0x4020ae46, 0x20bf7000);
    break;
  case 10:
    syscall(__NR_ioctl, r[2], 0xaeb7);
    break;
  case 11:
    syscall(__NR_ioctl, r[2], 0xae80, 0);
    break;
  case 12:
    syscall(__NR_ioctl, r[2], 0xae80, 0);
    break;
  case 13:
    NONFAILING(*(uint64_t*)0x207f3000 = 0x20920fa0);
    NONFAILING(*(uint32_t*)0x207f3008 = 0x60);
    NONFAILING(*(uint64_t*)0x207f3010 = 0x20fda000);
    NONFAILING(*(uint64_t*)0x207f3018 = 0);
    NONFAILING(*(uint64_t*)0x207f3020 = 0x20920f9c);
    NONFAILING(*(uint64_t*)0x207f3028 = 0x10);
    NONFAILING(*(uint32_t*)0x207f3030 = 0);
    NONFAILING(*(uint16_t*)0x20920fa0 = 0x27);
    NONFAILING(*(uint32_t*)0x20920fa4 = 0);
    NONFAILING(*(uint32_t*)0x20920fa8 = 0);
    NONFAILING(*(uint32_t*)0x20920fac = 0);
    NONFAILING(*(uint8_t*)0x20920fb0 = 0);
    NONFAILING(*(uint8_t*)0x20920fb1 = 0);
    NONFAILING(memcpy((void*)0x20920fb2,
                      "\x18\x14\x14\x56\x80\xff\xff\xff\xff\xff\xff\x78\x91\x00"
                      "\x00\x76\xe4\x31\x08\xf5\x6b\xbd\x95\x05\x4d\x6b\x05\x00"
                      "\x00\xbe\xbc\x48\xe8\xd8\xcd\xa3\xd6\x81\xfc\x48\x2e\x6e"
                      "\x97\x09\x00\x00\x00\x00\x00\x00\xda\x03\x03\xcc\x20\x8a"
                      "\x6e\x4b\xf8\x2e\xff\x4d\x04",
                      63));
    NONFAILING(*(uint64_t*)0x20920ff8 = 0);
    NONFAILING(*(uint64_t*)0x20920f9c = 0x10);
    NONFAILING(*(uint32_t*)0x20920fa4 = 0x29);
    NONFAILING(*(uint32_t*)0x20920fa8 = 0x3b);
    syscall(__NR_sendmsg, -1, 0x207f3000, 0);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(14);
  collide = 1;
  execute(14);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        int pid = do_sandbox_none(procid, false);
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}