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

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Message-ID: <20180310001916.GB11882@breakpoint.cc>
Date:   Sat, 10 Mar 2018 01:19:16 +0100
From:   Florian Westphal <fw@...len.de>
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

Alexey Dobriyan <adobriyan@...il.com> 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.

Acked-by: Florian Westphal <fw@...len.de>

I'll send a patch for xtables too to reject bogus names
coming from userspace (syzbot reports WARN() ).