linux-kernel - Re: [PATCH v2012.1] fs: symlink restrictions on sticky directories

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Message-ID: <20120106100520.GA7962@elte.hu>
Date:	Fri, 6 Jan 2012 11:05:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Rik van Riel <riel@...hat.com>,
	Federica Teodori <federica.teodori@...glemail.com>,
	Lucian Adrian Grijincu <lucian.grijincu@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Eric Paris <eparis@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dan Rosenberg <drosenberg@...curity.com>,
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v2012.1] fs: symlink restrictions on sticky directories

* Andrew Morton <akpm@...ux-foundation.org> wrote:

> Maybe true for a general purpose computer, but someone who is 
> making a single-purpose device such as a digital TV or a wifi 
> router won't want it.

That's the case for 99% of the features and semantics we have: 
by definition a single-purpose device uses only a small sub-set 
of an infinite purpose OS, right?

Still we only modularize semantics out if they easily fit into 
some existing plug-in/module concept, if the feature is arguably 
oddball that a sizable portion of people want to disable, or if 
it makes notable sense for size reasons. To me it looked 
distinctly silly to complicate things for such a small piece of 
code.

I doubt Kees would mind modularizing it, but it would be nice to 
get VFS maintainer feedback in the:

   { 'you are crazy, over my dead body' ... 'cool, merge it' }

continuous spectrum of possible answers.

Thanks,

	Ingo
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