linux-kernel - Re: [PATCH] vfs: hard-ban creating files with control characters in the name

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Date:   Thu, 5 Oct 2017 14:47:03 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     "Theodore Ts'o" <tytso@....edu>, Al Viro <viro@...IV.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfs: hard-ban creating files with control characters in
 the name

> For malformed Unicode or such, it'd make sense, yeah.

Not really. It's legitimate to have bad unicode in a directory, or have a
file system where some users are still in 8bit Russian encoding and some
are unicode for example.

The fix for this has always been the same - don't use shell script and
similar things (php for example) where incorrect quoting causes you to
execute random attacker code.

As most of the waya to attack a shell script are printable symbols like
$, ; ` and * you aren't going to save anyone by adding hacks to the VFS.

Alan