linux-kernel - Re: [AppArmor 38/45] AppArmor: Module and LSM hooks

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Message-ID: <20070609125839.GH27793@elf.ucw.cz>
Date:	Sat, 9 Jun 2007 14:58:40 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andreas Gruenbacher <agruen@...e.de>
Cc:	jjohansen@...e.de, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [AppArmor 38/45] AppArmor: Module and LSM hooks

Hi!

> > How will kernel work with very long paths? I'd suspect some problems,
> > if path is 1MB long and I attempt to print it in /proc
> > somewhere.
> 
> Pathnames are only used for informational purposes in the kernel, except in 
> AppArmor of course. /proc only uses pathnames in a few places, 
> but /proc/mounts will silently fail and produce garbage entries. That's not 
> ideal of course; we should fix that somehow.

> Note that this has nothing to do with the AppArmor discussion ...

This has everything to do with AA discussion. You took unreliable,
for-user-info kernel subsystem, and made security subsystem depend on
it. Oops.

> > Perhaps vfs should be modified not to allow such crazy paths? But placing
> > limit in aa is ugly. 
> 
> Dream on. Redefining fundamental vfs semantics is not an option; we should 
> rather make sure that we fail gracefully. Considering the

And instead of fixing "too long pathnames are problem in kernel" in
any clean way, you "simply" included
configurable-but-impossible-to-configure-right limit into
apparmor. And now you want that merged. Dream on.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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