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Re: bin/55815: tar opens device files
The following reply was made to PR bin/55815; it has been noted by GNATS.
From: Christos Zoulas <christos%zoulas.com@localhost>
Subject: Re: bin/55815: tar opens device files
Date: Wed, 25 Nov 2020 13:20:28 -0500
> I don't know what's available for fetching extattrs, but if that requires
> an open, we should fix that, and make them available without opening.
> But surely there is already a way, I can't believe that ls attempts to
> open files, yet it shows (when asked) extattrs, right?
There are methods by pathname and by fd. By pathname suffer from
TOCTOU, so we need to do by fd. To get an fd we need open. So the
only reasonable solution seems to be to provide an open flag that does
not have side effects on devices.
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