// https://syzkaller.appspot.com/bug?id=909e5fffddb5321fd022fa2d8a620638193e3455
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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);                       \
  }

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  install_segv_handler();
  intptr_t res = 0;
  NONFAILING(memcpy((void*)0x20000240, "./file1\000", 8));
  syscall(__NR_mkdir, 0x20000240ul, 0ul);
  NONFAILING(memcpy((void*)0x20000180, "./bus\000", 6));
  syscall(__NR_mkdir, 0x20000180ul, 0ul);
  NONFAILING(memcpy((void*)0x20000280, "./file0\000", 8));
  syscall(__NR_mkdir, 0x20000280ul, 0ul);
  NONFAILING(memcpy((void*)0x20000000, "./bus\000", 6));
  NONFAILING(memcpy((void*)0x20000080, "overlay\000", 8));
  NONFAILING(memcpy((void*)0x20000100,
                    "lowerdir=./bus,workdir=./file1,upperdir=./file0", 47));
  syscall(__NR_mount, 0x400000ul, 0x20000000ul, 0x20000080ul, 0ul,
          0x20000100ul);
  NONFAILING(memcpy((void*)0x200002c0, "./bus\000", 6));
  syscall(__NR_chdir, 0x200002c0ul);
  NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
  syscall(__NR_open, 0x20000040ul, 0x141042ul, 0ul);
  NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
  res = syscall(__NR_open, 0x20000040ul, 0ul, 0ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint64_t*)0x200003c0 = 0);
  NONFAILING(*(uint64_t*)0x200003c8 = 0xff00000000000000);
  NONFAILING(*(uint16_t*)0x200003d0 = 0);
  NONFAILING(*(uint16_t*)0x200003d2 = 0);
  NONFAILING(*(uint32_t*)0x200003d4 = 0);
  syscall(__NR_ioctl, r[0], 0xc020660b, 0x200003c0ul);
  return 0;
}