// https://syzkaller.appspot.com/bug?id=a56ef51971de0eed577b691850688344f0f2a0d3
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

#define _GNU_SOURCE

#include <errno.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/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>

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

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  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);
  for (;;) {
  }
}

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);

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_IO);
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  int pid = fork();
  if (pid)
    return pid;

  sandbox_common();

  loop();
  doexit(1);
}

static void test();

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

long r[15];
void test()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0x81b000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  NONFAILING(*(uint32_t*)0x20001fec = (uint32_t)0x1);
  NONFAILING(*(uint32_t*)0x20001ff0 = (uint32_t)0x87);
  NONFAILING(*(uint32_t*)0x20001ff4 = (uint32_t)0x3);
  NONFAILING(*(uint32_t*)0x20001ff8 = (uint32_t)0x1);
  NONFAILING(*(uint32_t*)0x20001ffc = (uint32_t)0x5);
  NONFAILING(*(uint32_t*)0x20002000 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x20002004 = (uint32_t)0xffffffffffff8b7b);
  r[8] = syscall(__NR_bpf, 0x0ul, 0x20001fecul, 0x1cul);
  NONFAILING(*(uint32_t*)0x20006000 = r[8]);
  NONFAILING(*(uint64_t*)0x20006008 = (uint64_t)0x2000d000);
  NONFAILING(*(uint64_t*)0x20006010 = (uint64_t)0x20009000);
  NONFAILING(*(uint64_t*)0x20006018 = (uint64_t)0x0);
  NONFAILING(memcpy(
      (void*)0x20009000,
      "\x63\xd9\xdf\x0d\xcd\xf2\x96\x99\xdb\xb8\x18\x24\x55\xb1\x0e\x52"
      "\x24\x1b\x6f\x5a\x50\x26\xce\xac\x47\xd3\x56\x10\x8b\x9b\x54\x65"
      "\xca\x62\xa4\xe5\x67\xd9\xa5\x86\xf3\x09\xf0\x0d\x64\x91\xba\x35"
      "\xc5\x6f\x0d\x5d\xb4\xb7\xec\x3f\x9a\xf9\xef\xb7\xda\xad\x91\xda"
      "\x19\x19\xc2\x1a\xc8\x40\x4e\xbc\xb1\x49\x61\x99\x45\x69\xb7\x57"
      "\xf4\xd8\x55\x31\x66\x8b\xf7\x9b\x4c\xea\x3f\x69\xc7\xf9\x39",
      95));
  r[14] = syscall(__NR_bpf, 0x2ul, 0x20006000ul, 0x20ul);
}

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