how to detect segfault of QEMU linux process

[juniorprincewang]

In the qemu_linux_process example, I try to test the segfault, however the fuzzer fails to observe the crash, the qemu instance continues to process.
So how to detect the segfault or timeout of QEMU linux process?

bool FuzzMe(const uint8_t *Data, size_t DataSize) {
  if (DataSize > 3) {
    if (Data[0] == 'F') {
      if (Data[1] == 'U') {
        if (Data[2] == 'Z') {
          if (Data[3] == 'Z') { *(char *)1 = 2; }
        }
      }
    }
  }

  return false;
}

int main() {
  // Prepare some space for the input
  uint8_t Data[10] = {0};

  lqprintf("Fuzzing starts\n");

  // Start fuzzer here
  size_t len = libafl_qemu_start_virt(Data, 10);

  // Call the target
  bool ret = FuzzMe(Data, len);

  libafl_qemu_end(LIBAFL_QEMU_END_OK);
}