We know that trigrams are the right way to tokenize these documents, we know how to tokenize documents when building the index, and how to tokenize queries when searching. We can put all this together into an actual search index that can match regular expressions very efficiently. By decomposing any regular expression into a set of trigrams and loading all the relevant posting lists from the inverted index, we end up with a list of documents that can potentially match our regular expression. This is important! The final result set will only be obtained by actually loading all the potential documents and matching the regular expression "the old fashioned way". But having this sub-set of documents is always faster than having to scan and match the whole codebase, file by file.
Further Reading
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Author(s): Sanghyun Ji, Wooseob Shin, Kunok Chang
该漏洞存在于LINEMODE SLC协商处理模块。虽然严格来说仅影响GNU inetutils，但由于多数厂商的Telnetd实现基于相同代码库，导致受影响范围广泛且难以精确统计。经确认，所有主流Linux发行版均受影响。
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