void genShellHistoryForUser(const std::string& uid,
                            const std::string& gid,
                            const std::string& directory,
                            QueryData& results) {
  auto dropper = DropPrivileges::get();
  if (!dropper->dropTo(uid, gid)) {
    VLOG(1) << "Cannot drop privileges to UID " << uid;
    return;
  }

  for (const auto& hfile : kShellHistoryFiles) {
    boost::filesystem::path history_file = directory;
    history_file /= hfile;
    genShellHistoryFromFile(uid, history_file, results);
  }
}

I am seeing the osquery source code,But I have a question about the

genShellHistoryForUser

. what's the meaning of

dropTo(uid, gid)

?Is there any security problem if we don't drop Privileges?