// https://syzkaller.appspot.com/bug?id=25b6319de87ee906cb56b0cfc42c0b7543d7c822
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <sys/types.h>

#include <dirent.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (sig == SIGBUS)
    valid = 1;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void reset_flags(const char* filename)
{
  struct stat st;
  if (lstat(filename, &st))
    exit(1);
  st.st_flags &= ~(SF_NOUNLINK | UF_NOUNLINK | SF_IMMUTABLE | UF_IMMUTABLE |
                   SF_APPEND | UF_APPEND);
  if (lchflags(filename, st.st_flags))
    exit(1);
}
static void __attribute__((noinline)) remove_dir(const char* dir)
{
  DIR* dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EACCES) {
      if (rmdir(dir))
        exit(1);
      return;
    }
    exit(1);
  }
  struct dirent* ep = 0;
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename)) {
      if (errno == EPERM) {
        reset_flags(filename);
        reset_flags(dir);
        if (unlink(filename) == 0)
          continue;
      }
      exit(1);
    }
  }
  closedir(dp);
  while (rmdir(dir)) {
    if (errno == EPERM) {
      reset_flags(dir);
      if (rmdir(dir) == 0)
        break;
    }
    exit(1);
  }
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static void sandbox_common()
{
  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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  return 0;
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  for (call = 0; call < 18; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    syscall(SYS_openat, 0xffffffffffffff9cul, 0ul, 0ul, 0ul);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20000100, "/dev/crypto\000", 12));
    res = syscall(SYS_openat, 0xffffffffffffff9cul, 0x20000100ul, 0ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    NONFAILING(*(uint32_t*)0x20000080 = 0);
    NONFAILING(*(uint32_t*)0x20000084 = 0x14);
    NONFAILING(*(uint32_t*)0x20000088 = 0);
    NONFAILING(*(uint64_t*)0x20000090 = 0);
    NONFAILING(*(uint32_t*)0x20000098 = 1);
    NONFAILING(*(uint64_t*)0x200000a0 = 0x20000240);
    NONFAILING(memset((void*)0x20000240, 124, 1));
    NONFAILING(*(uint32_t*)0x200000a8 = 0);
    NONFAILING(*(uint32_t*)0x200000ac = 0x7d86619b);
    NONFAILING(*(uint32_t*)0x200000b0 = 0);
    NONFAILING(*(uint32_t*)0x200000b4 = 0);
    NONFAILING(*(uint32_t*)0x200000b8 = 0);
    NONFAILING(*(uint32_t*)0x200000bc = 0);
    syscall(SYS_ioctl, r[0], 0xc040636aul, 0x20000080ul);
    break;
  case 3:
    syscall(SYS_socket, 2ul, 1ul, 0);
    break;
  case 4:
    NONFAILING(
        memcpy((void*)0x20000200,
               "rack\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
               "\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
               32));
    NONFAILING(*(uint32_t*)0x20000220 = 0);
    syscall(SYS_setsockopt, -1, 6, 0x2000, 0x20000200ul, 0x24ul);
    break;
  case 5:
    NONFAILING(*(uint8_t*)0x20000240 = 0x10);
    NONFAILING(*(uint8_t*)0x20000241 = 2);
    NONFAILING(*(uint16_t*)0x20000242 = htobe16(0x4e23 + procid * 4));
    NONFAILING(*(uint32_t*)0x20000244 = htobe32(0xc));
    NONFAILING(memset((void*)0x20000248, 0, 8));
    syscall(SYS_connect, -1, 0x20000240ul, 0x10ul);
    break;
  case 6:
    NONFAILING(*(uint8_t*)0x20000340 = 0x10);
    NONFAILING(*(uint8_t*)0x20000341 = 2);
    NONFAILING(*(uint16_t*)0x20000342 = htobe16(0x4e21 + procid * 4));
    NONFAILING(*(uint32_t*)0x20000344 = htobe32(-1));
    NONFAILING(memset((void*)0x20000348, 0, 8));
    syscall(SYS_connect, -1, 0x20000340ul, 0x10ul);
    break;
  case 7:
    res = syscall(SYS_socket, 0x1cul, 1ul, 0x84);
    if (res != -1)
      r[1] = res;
    break;
  case 8:
    NONFAILING(*(uint8_t*)0x20000200 = 0x1c);
    NONFAILING(*(uint8_t*)0x20000201 = 0x1c);
    NONFAILING(*(uint16_t*)0x20000202 = htobe16(0x4e22 + procid * 4));
    NONFAILING(*(uint32_t*)0x20000204 = 0);
    NONFAILING(memset((void*)0x20000208, 0, 16));
    NONFAILING(*(uint32_t*)0x20000218 = 0);
    syscall(SYS_bind, r[1], 0x20000200ul, 0x1cul);
    break;
  case 9:
    res = syscall(SYS_socket, 2ul, 1ul, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 10:
    NONFAILING(
        memcpy((void*)0x20000080,
               "bbr\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
               "\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
               32));
    NONFAILING(*(uint32_t*)0x200000a0 = 0);
    syscall(SYS_setsockopt, r[2], 6, 0x2000, 0x20000080ul, 0x24ul);
    break;
  case 11:
    NONFAILING(*(uint32_t*)0x20000040 = 7);
    syscall(SYS_setsockopt, r[2], 6, 1, 0x20000040ul, 4ul);
    break;
  case 12:
    NONFAILING(*(uint8_t*)0x200000c0 = 0x34);
    NONFAILING(*(uint8_t*)0x200000c1 = 2);
    NONFAILING(*(uint16_t*)0x200000c2 = htobe16(0x4e22 + procid * 4));
    NONFAILING(*(uint32_t*)0x200000c4 = htobe32(0xfffffffe));
    NONFAILING(memset((void*)0x200000c8, 0, 8));
    syscall(SYS_connect, r[2], 0x200000c0ul, 0x10ul);
    break;
  case 13:
    NONFAILING(*(uint64_t*)0x20000740 = 0x20000280);
    NONFAILING(*(uint8_t*)0x20000280 = 0x10);
    NONFAILING(*(uint8_t*)0x20000281 = 2);
    NONFAILING(*(uint16_t*)0x20000282 = htobe16(0x4e21 + procid * 4));
    NONFAILING(*(uint32_t*)0x20000284 = htobe32(-1));
    NONFAILING(memset((void*)0x20000288, 0, 8));
    NONFAILING(*(uint32_t*)0x20000748 = 0x10);
    NONFAILING(*(uint64_t*)0x20000750 = 0x20000480);
    NONFAILING(*(uint64_t*)0x20000480 = 0x20000380);
    NONFAILING(memcpy(
        (void*)0x20000380,
        "\xca\x1b\x3b\x5c\x42\x2c\xa6\x56\x75\xe2\x74\xc4\x29\x23\x88\x9a\x63"
        "\xf2\x50\xf3\x61\x8a\xf3\x49\x9a\xf1\x8a\xe3\xb7\x38\xb9\xb6\xb5\x42"
        "\x8e\x18\xe8\xa6\xf7\x0a\x1f\xad\x05\xf0\x33\x88\xe5\xd7\xfc\xc7\x96"
        "\xfa\x87\x4a\x4c\x85\x0f\xc1\x14\xd5\x9d\x7d\x09\x5f\x07\xc3\x33\x8b"
        "\x76\x53\xed\x75\x6e\x08\xfc\x83\x25\xe6\x98\x31\xde\x64\x11\x13\x88"
        "\x39\x05\x3b\x1a\x7b\x32\x63\x6f\x2e\x05\xfc\xbc\xad\xa2\x37\x5b\xde"
        "\x92\xed\x0a\xc7\x06\x04\x2e\xfe\x8a\x3b\xcd\x09\x5a\x7a\xb5\x7a\xc9"
        "\xdd\xbd\xc9\x4f\x15\x5b\xf7\xe7\x59\x26\x50\x58\x45\xf5\x9d\x15\xad"
        "\xa6\xe7\x60\x61\xb7\x83\x4b\xf5\xc7\xd5\x01\xf2\x6c\x27\x52\xd4\x51"
        "\xca\x96\xb5\xf6\x1b\x34\xc8\x88\x65\xcf\xe2\x5d\xfb\x93\x9a\x9f\xcb"
        "\xb9\x14\x57\x6b\x32\x75\x36\x77\x4e\x0c\x58\xa3\x9e\x0a\x14\x39\xa3"
        "\x2f\xb8\x37\xba\x6d\xfe\x9e\xa4\x3c\xb5\x10\x08\xfc\xae\xec\x67\x66"
        "\x3c\xe7\x7b\xfb\xc5\x0a\xff\xa6\x91\x35\xc9\x38",
        216));
    NONFAILING(*(uint64_t*)0x20000488 = 0xd8);
    NONFAILING(*(uint64_t*)0x20000490 = 0x200001c0);
    NONFAILING(*(uint64_t*)0x20000498 = 0);
    NONFAILING(*(uint32_t*)0x20000758 = 2);
    NONFAILING(*(uint64_t*)0x20000760 = 0);
    NONFAILING(*(uint32_t*)0x20000768 = 0);
    NONFAILING(*(uint32_t*)0x2000076c = 0x81);
    syscall(SYS_sendmsg, r[2], 0x20000740ul, 0ul);
    break;
  case 14:
    NONFAILING(*(uint8_t*)0x20000240 = 0x1c);
    NONFAILING(*(uint8_t*)0x20000241 = 0x1c);
    NONFAILING(*(uint16_t*)0x20000242 = htobe16(0x4e22 + procid * 4));
    NONFAILING(*(uint32_t*)0x20000244 = 4);
    NONFAILING(memset((void*)0x20000248, 0, 16));
    NONFAILING(*(uint32_t*)0x20000258 = 0xd6);
    syscall(SYS_bindat, r[1], r[2], 0x20000240ul, 0x1cul);
    break;
  case 15:
    NONFAILING(*(uint16_t*)0x20000040 = 0xff);
    NONFAILING(*(uint16_t*)0x20000042 = 0x200);
    NONFAILING(*(uint32_t*)0x20000044 = 2);
    NONFAILING(*(uint32_t*)0x20000048 = 7);
    NONFAILING(*(uint32_t*)0x2000004c = 0);
    syscall(SYS_setsockopt, r[1], 0x84, 0x1203, 0x20000040ul, 0x10ul);
    break;
  case 16:
    NONFAILING(*(uint8_t*)0x200000c0 = 0x1c);
    NONFAILING(*(uint8_t*)0x200000c1 = 0x1c);
    NONFAILING(*(uint16_t*)0x200000c2 = htobe16(0x4e22 + procid * 4));
    NONFAILING(*(uint32_t*)0x200000c4 = 0);
    NONFAILING(*(uint64_t*)0x200000c8 = htobe64(0));
    NONFAILING(*(uint64_t*)0x200000d0 = htobe64(1));
    NONFAILING(*(uint32_t*)0x200000d8 = 0);
    syscall(SYS_connect, r[1], 0x200000c0ul, 0x1cul);
    break;
  case 17:
    NONFAILING(
        memcpy((void*)0x200002c0,
               "\xb1\x3d\x92\x88\x7b\x21\xbd\x16\x73\x39\xdc\x75\xc2\x55\x40"
               "\xa6\x8b\x86\x1c\x98\x2d\xf3\x03\xc3\xf1\x63\x96\x8f\x1f\xe7"
               "\x58\xc0\xc4\xf5\x9d\x86\x97\x2a\x88\x5f\x7c\x41\xcd\xc7\x80"
               "\x2a\x41\xcb\xc7\xc1\xed\x17\x9c\x25\x35\x22\x61\xe0\x28\xa9"
               "\xca\x42\x37\x13\x51\xe6\x5f\x60\x68\x99\xb3\x55\xb9\x5f\x6c",
               75));
    syscall(SYS_sendto, r[1], 0x200002c0ul, 0x4bul, 1ul, 0ul, 0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
  install_segv_handler();
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}