Privilege drop — run as nobody (UID 65534) with PR_SET_NO_NEW_PRIVS
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，这一点在91视频中也有详细论述
The BBC asked Facebook why it couldn't use its facial recognition technology to assist the hunt for Lucy. It responded: "To protect user privacy, it's important that we follow the appropriate legal process, but we work to support law enforcement as much as we can."，这一点在heLLoword翻译官方下载中也有详细论述
PrintSquares(nums...) // variadic expansion。关于这个话题，爱思助手下载最新版本提供了深入分析