// https://syzkaller.appspot.com/bug?id=7a38d1126509cf42e4b24faf146fe198259292cd
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sched.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/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/futex.h>

static unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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 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 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;
  for (i = 0; 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 {
  int state;
} event_t;

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

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

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

#define MAX_FDS 30

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 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 = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 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);
  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  exit(1);
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void close_fds()
{
  int fd;
  for (fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

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 < 14; 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, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  close_fds();
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    syscall(__NR_mprotect, 0x20005000ul, 0x3000ul, 0ul);
    break;
  case 1:
    syscall(__NR_setsockopt, -1, 6, 0xd, 0ul, 0ul);
    break;
  case 2:
    syscall(__NR_perf_event_open, 0ul, 0, -1ul, -1, 0ul);
    break;
  case 3:
    syscall(__NR_shmget, 0x798dd814ul + procid * 4, 0x4000ul, 0ul,
            0x2096d000ul);
    break;
  case 4:
    syscall(__NR_process_vm_writev, 0, 0ul, 0ul, 0ul, 0ul, 0ul);
    break;
  case 5:
    syscall(__NR_getpgrp, 0);
    break;
  case 6:
    syscall(__NR_bpf, 0xful, 0ul, 0ul);
    break;
  case 7:
    syscall(__NR_setsockopt, -1, 0x10f, 0x87, 0ul, 0ul);
    break;
  case 8:
    syscall(__NR_eventfd2, 0, 0ul);
    break;
  case 9:
    syscall(__NR_getsockopt, -1, 0x65, 6, 0ul, 0ul);
    break;
  case 10:
    NONFAILING(memcpy((void*)0x20000480, "/dev/fb0\000", 9));
    res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000480ul, 0ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 11:
    NONFAILING(*(uint32_t*)0x20000000 = 0x356);
    NONFAILING(*(uint32_t*)0x20000004 = 0);
    NONFAILING(*(uint32_t*)0x20000008 = 0);
    NONFAILING(*(uint32_t*)0x2000000c = 0x280);
    NONFAILING(*(uint32_t*)0x20000010 = 0);
    NONFAILING(*(uint32_t*)0x20000014 = 0x4b76);
    NONFAILING(*(uint32_t*)0x20000018 = 8);
    NONFAILING(*(uint32_t*)0x2000001c = 0);
    NONFAILING(*(uint32_t*)0x20000020 = 0);
    NONFAILING(*(uint32_t*)0x20000024 = 0);
    NONFAILING(*(uint32_t*)0x20000028 = 0);
    NONFAILING(*(uint32_t*)0x2000002c = 0);
    NONFAILING(*(uint32_t*)0x20000030 = 0);
    NONFAILING(*(uint32_t*)0x20000034 = 0);
    NONFAILING(*(uint32_t*)0x20000038 = 0);
    NONFAILING(*(uint32_t*)0x2000003c = 0);
    NONFAILING(*(uint32_t*)0x20000040 = 0);
    NONFAILING(*(uint32_t*)0x20000044 = 0);
    NONFAILING(*(uint32_t*)0x20000048 = 0);
    NONFAILING(*(uint32_t*)0x2000004c = 0);
    NONFAILING(*(uint32_t*)0x20000050 = 0);
    NONFAILING(*(uint32_t*)0x20000054 = 0);
    NONFAILING(*(uint32_t*)0x20000058 = 0);
    NONFAILING(*(uint32_t*)0x2000005c = 0);
    NONFAILING(*(uint32_t*)0x20000060 = 0);
    NONFAILING(*(uint32_t*)0x20000064 = 0);
    NONFAILING(*(uint32_t*)0x20000068 = 0);
    NONFAILING(*(uint32_t*)0x2000006c = 0);
    NONFAILING(*(uint32_t*)0x20000070 = 0);
    NONFAILING(*(uint32_t*)0x20000074 = 0);
    NONFAILING(*(uint32_t*)0x20000078 = 0);
    NONFAILING(*(uint32_t*)0x2000007c = 0);
    NONFAILING(*(uint32_t*)0x20000080 = 0);
    NONFAILING(*(uint32_t*)0x20000084 = 0);
    NONFAILING(*(uint32_t*)0x20000088 = 0);
    NONFAILING(*(uint32_t*)0x2000008c = 0);
    NONFAILING(*(uint32_t*)0x20000090 = 0);
    NONFAILING(*(uint32_t*)0x20000094 = 0);
    NONFAILING(*(uint32_t*)0x20000098 = 0);
    NONFAILING(*(uint32_t*)0x2000009c = 0);
    syscall(__NR_ioctl, r[0], 0x4601, 0x20000000ul);
    break;
  case 12:
    NONFAILING(memcpy((void*)0x20000180, "/dev/fb0\000", 9));
    res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000180ul, 0ul, 0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 13:
    NONFAILING(*(uint32_t*)0x20000340 = 0x30);
    NONFAILING(*(uint32_t*)0x20000344 = 0x10);
    NONFAILING(*(uint32_t*)0x20000348 = 0);
    NONFAILING(*(uint32_t*)0x2000034c = 0);
    NONFAILING(*(uint32_t*)0x20000350 = 0);
    NONFAILING(*(uint32_t*)0x20000354 = 0);
    NONFAILING(*(uint32_t*)0x20000358 = 4);
    NONFAILING(*(uint32_t*)0x2000035c = 0);
    NONFAILING(*(uint32_t*)0x20000360 = 0);
    NONFAILING(*(uint32_t*)0x20000364 = 0x235df24b);
    NONFAILING(*(uint32_t*)0x20000368 = 0);
    NONFAILING(*(uint32_t*)0x2000036c = 0);
    NONFAILING(*(uint32_t*)0x20000370 = 0);
    NONFAILING(*(uint32_t*)0x20000374 = 0);
    NONFAILING(*(uint32_t*)0x20000378 = 0);
    NONFAILING(*(uint32_t*)0x2000037c = 0);
    NONFAILING(*(uint32_t*)0x20000380 = 0);
    NONFAILING(*(uint32_t*)0x20000384 = 1);
    NONFAILING(*(uint32_t*)0x20000388 = 0);
    NONFAILING(*(uint32_t*)0x2000038c = 0);
    NONFAILING(*(uint32_t*)0x20000390 = 0);
    NONFAILING(*(uint32_t*)0x20000394 = 0);
    NONFAILING(*(uint32_t*)0x20000398 = 0);
    NONFAILING(*(uint32_t*)0x2000039c = 0);
    NONFAILING(*(uint32_t*)0x200003a0 = 0);
    NONFAILING(*(uint32_t*)0x200003a4 = 0);
    NONFAILING(*(uint32_t*)0x200003a8 = 0);
    NONFAILING(*(uint32_t*)0x200003ac = 0);
    NONFAILING(*(uint32_t*)0x200003b0 = 0);
    NONFAILING(*(uint32_t*)0x200003b4 = 0);
    NONFAILING(*(uint32_t*)0x200003b8 = 0);
    NONFAILING(*(uint32_t*)0x200003bc = 0);
    NONFAILING(*(uint32_t*)0x200003c0 = 0);
    NONFAILING(*(uint32_t*)0x200003c4 = 0);
    NONFAILING(*(uint32_t*)0x200003c8 = 0);
    NONFAILING(*(uint32_t*)0x200003cc = 0);
    NONFAILING(*(uint32_t*)0x200003d0 = 0);
    NONFAILING(*(uint32_t*)0x200003d4 = 0);
    NONFAILING(*(uint32_t*)0x200003d8 = 0);
    NONFAILING(*(uint32_t*)0x200003dc = 0);
    syscall(__NR_ioctl, r[1], 0x4601, 0x20000340ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0ul);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}