[issue17180] shutil copy* unsafe on POSIX - they preserve setuid/setgit bits

[Christian Heimes]

Christian Heimes added the comment:

cp removes three bits unless preserve ownership is enabled and some additional things are true. 

mode &= ~ (S_ISUID | S_ISGID | S_ISVTX)

S_ISVTX is the sticky bit.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17180>
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