Speculative Taint Tracking (STT)
Jiyong Yu, Mengjia Yan, Artem Khyzha, Adam Morrison, Josep Torrellas, Christopher W. Fletcher · 2019
Speculative execution attacks present an enormous security threat, capable of reading arbitrary program data under malicious speculation, and later exfiltrating that data over microarchitectural covert channels. Since these attacks first rely on being able to read arbitrary data (potential secrets), a conservative approach to defeat all attacks is to delay the execution of instructions that read those secrets, until those instructions become non-speculative.