// https://syzkaller.appspot.com/bug?id=ab2b76b5454b77fb2249e858b8c74c1f7d552ab5
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    NONFAILING(strncpy(buf, (char*)a0, sizeof(buf)));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

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

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(CLONE_NEWCGROUP)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

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

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }

  loop();
  doexit(1);
}

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 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);
        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;
      }
    }
  }
}

#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_poll
#define __NR_poll 168
#endif
#ifndef __NR_readv
#define __NR_readv 145
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[1];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20061000, "/dev/snd/timer", 15));
    r[0] = syz_open_dev(0x20061000, 0, 0);
    break;
  case 2:
    NONFAILING(*(uint32_t*)0x2060c000 = 1);
    NONFAILING(*(uint32_t*)0x2060c004 = 0);
    NONFAILING(*(uint32_t*)0x2060c008 = 0);
    NONFAILING(*(uint32_t*)0x2060c00c = 0);
    NONFAILING(*(uint32_t*)0x2060c010 = 0);
    NONFAILING(*(uint8_t*)0x2060c014 = 0);
    NONFAILING(*(uint8_t*)0x2060c015 = 0);
    NONFAILING(*(uint8_t*)0x2060c016 = 0);
    NONFAILING(*(uint8_t*)0x2060c017 = 0);
    NONFAILING(*(uint8_t*)0x2060c018 = 0);
    NONFAILING(*(uint8_t*)0x2060c019 = 0);
    NONFAILING(*(uint8_t*)0x2060c01a = 0);
    NONFAILING(*(uint8_t*)0x2060c01b = 0);
    NONFAILING(*(uint8_t*)0x2060c01c = 0);
    NONFAILING(*(uint8_t*)0x2060c01d = 0);
    NONFAILING(*(uint8_t*)0x2060c01e = 0);
    NONFAILING(*(uint8_t*)0x2060c01f = 0);
    NONFAILING(*(uint8_t*)0x2060c020 = 0);
    NONFAILING(*(uint8_t*)0x2060c021 = 0);
    NONFAILING(*(uint8_t*)0x2060c022 = 0);
    NONFAILING(*(uint8_t*)0x2060c023 = 0);
    NONFAILING(*(uint8_t*)0x2060c024 = 0);
    NONFAILING(*(uint8_t*)0x2060c025 = 0);
    NONFAILING(*(uint8_t*)0x2060c026 = 0);
    NONFAILING(*(uint8_t*)0x2060c027 = 0);
    NONFAILING(*(uint8_t*)0x2060c028 = 0);
    NONFAILING(*(uint8_t*)0x2060c029 = 0);
    NONFAILING(*(uint8_t*)0x2060c02a = 0);
    NONFAILING(*(uint8_t*)0x2060c02b = 0);
    NONFAILING(*(uint8_t*)0x2060c02c = 0);
    NONFAILING(*(uint8_t*)0x2060c02d = 0);
    NONFAILING(*(uint8_t*)0x2060c02e = 0);
    NONFAILING(*(uint8_t*)0x2060c02f = 0);
    NONFAILING(*(uint8_t*)0x2060c030 = 0);
    NONFAILING(*(uint8_t*)0x2060c031 = 0);
    NONFAILING(*(uint8_t*)0x2060c032 = 0);
    NONFAILING(*(uint8_t*)0x2060c033 = 0);
    syscall(__NR_ioctl, r[0], 0x40345410, 0x2060c000);
    break;
  case 3:
    syscall(__NR_ioctl, r[0], 0x54a0);
    break;
  case 4:
    NONFAILING(*(uint32_t*)0x204da000 = r[0]);
    NONFAILING(*(uint16_t*)0x204da004 = 0);
    NONFAILING(*(uint16_t*)0x204da006 = 0);
    NONFAILING(*(uint32_t*)0x204da008 = -1);
    NONFAILING(*(uint16_t*)0x204da00c = 0x2040);
    NONFAILING(*(uint16_t*)0x204da00e = 0);
    syscall(__NR_poll, 0x204da000, 2, 0xffffff80);
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x201e1fcc = 2);
    NONFAILING(*(uint32_t*)0x201e1fd0 = 0);
    NONFAILING(*(uint32_t*)0x201e1fd4 = 0x257);
    NONFAILING(*(uint32_t*)0x201e1fd8 = 3);
    NONFAILING(*(uint32_t*)0x201e1fdc = 5);
    NONFAILING(*(uint8_t*)0x201e1fe0 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe1 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe2 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe3 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe4 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe5 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe6 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe7 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe8 = 0);
    NONFAILING(*(uint8_t*)0x201e1fe9 = 0);
    NONFAILING(*(uint8_t*)0x201e1fea = 0);
    NONFAILING(*(uint8_t*)0x201e1feb = 0);
    NONFAILING(*(uint8_t*)0x201e1fec = 0);
    NONFAILING(*(uint8_t*)0x201e1fed = 0);
    NONFAILING(*(uint8_t*)0x201e1fee = 0);
    NONFAILING(*(uint8_t*)0x201e1fef = 0);
    NONFAILING(*(uint8_t*)0x201e1ff0 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff1 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff2 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff3 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff4 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff5 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff6 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff7 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff8 = 0);
    NONFAILING(*(uint8_t*)0x201e1ff9 = 0);
    NONFAILING(*(uint8_t*)0x201e1ffa = 0);
    NONFAILING(*(uint8_t*)0x201e1ffb = 0);
    NONFAILING(*(uint8_t*)0x201e1ffc = 0);
    NONFAILING(*(uint8_t*)0x201e1ffd = 0);
    NONFAILING(*(uint8_t*)0x201e1ffe = 0);
    NONFAILING(*(uint8_t*)0x201e1fff = 0);
    syscall(__NR_ioctl, r[0], 0x40345410, 0x201e1fcc);
    break;
  case 6:
    NONFAILING(*(uint32_t*)0x20c2bffc = 1);
    syscall(__NR_ioctl, r[0], 0x40045402, 0x20c2bffc);
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x20690fa0 = 0x204e0000);
    NONFAILING(*(uint32_t*)0x20690fa4 = 0x4c);
    NONFAILING(*(uint32_t*)0x20690fa8 = 0x20546000);
    NONFAILING(*(uint32_t*)0x20690fac = 0x1000);
    NONFAILING(*(uint32_t*)0x20690fb0 = 0x206c5000);
    NONFAILING(*(uint32_t*)0x20690fb4 = 3);
    NONFAILING(*(uint32_t*)0x20690fb8 = 0x20fc3000);
    NONFAILING(*(uint32_t*)0x20690fbc = 0xe2);
    NONFAILING(*(uint32_t*)0x20690fc0 = 0x20883000);
    NONFAILING(*(uint32_t*)0x20690fc4 = 0xa7);
    NONFAILING(*(uint32_t*)0x20690fc8 = 0x20ef2000);
    NONFAILING(*(uint32_t*)0x20690fcc = 0x1000);
    syscall(__NR_readv, r[0], 0x20690fa0, 6);
    break;
  }
}

void loop()
{
  memset(r, -1, sizeof(r));
  execute(8);
}

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