This is an alternative fix for #25849, as proposed by @dsnet in https://github.com/golang/go/issues/25849#issuecomment-396685881.
archive/zip readers return unsanitized paths from archives. Careless use of these paths leads to path traversal attacks.
An insecure filename is an absolute path, or a path containing a relative path component (
tar.Reader.Next reads a file with an insecure filename, it returns
zip.NewReader opens an archive containing an insecure filename, it returns
In both cases, the function also returns a usable object (a
In the case where the caller wants to handle archives with insecure filenames, they may ignore the
ErrInsecurePath error and perform whatever sanitization they find appropriate. If the caller takes no action, they get an error when processing an unsafe archive.
The advantage over automatically sanitizing filenames is that we don't silently change the semantics of archives. A tar archive may legitimately contain absolute path names; silently converting these to relative names seems more surprising than reporting an error. In addition, there isn't always an obvious sanitized name--we probably want to reject the name
COM1 on Windows, but what would we rewrite it into?
One of the great things about TextBlob is that it allows the user to choose an algorithm for implementation of the high-level NLP tasks: PatternAnalyzer - a default classifier that is built on the pattern library. NaiveBayesAnalyzer - an NLTK model trained on a movie reviews corpus.Oct 23, 2020
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