linux-kernel - Re: [PATCH] proc: reject "." and ".." as filenames

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Message-ID: <20180311213057.GA3769@amd>
Date:   Sun, 11 Mar 2018 22:30:58 +0100
From:   Pavel Machek <pavel@....cz>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        eric.dumazet@...il.com, xiyou.wangcong@...il.com, fw@...len.de
Subject: Re: [PATCH] proc: reject "." and ".." as filenames

On Sat 2018-03-10 03:12:23, Alexey Dobriyan wrote:
> Various subsystems can create files and directories in /proc
> with names directly controlled by userspace.
> 
> Which means "/", "." and ".." are no-no.
> 
> "/" split is already taken care of, do the other 2 prohibited names.

Hmm, patch is probably good idea, but now it means that userspace can
trigger WARN()s, and can hide objects from root by naming them '.' and
'..'... which is not good.

If you know where this happens, it would be nice to fix them in
addition to this patch.
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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