[Bug 269780] O_RESOLVE_BENEATH succeeds on ".." on "/"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269780

Konstantin Belousov <kib@FreeBSD.org> changed:

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--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
What are the consequences of knowing that fd is root?
In other words, what could an adversary do knowing that, that she could not
do otherwise?

I do not want to introduce a special case in lookup() for this situation,
unless it is indeed a must.

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