[issue4489] shutil.rmtree is vulnerable to a symlink attack

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Using chdir() makes sense and it doesn't look like a too big problem to me:

It's a problem if another thread in the process is making file
operations using relative paths at the same time.

Since shutil functions have until now been safe against this
possibility, I don't think it's ok to make them unsafe in future
versions.

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