linux-kernel - Re: [PATCH] Smackv10: Smack rules grammar + their stateful parser

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Message-ID: <20071107015912.GT26163@stusta.de>
Date:	Wed, 7 Nov 2007 02:59:12 +0100
From:	Adrian Bunk <bunk@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Ahmed S. Darwish" <darwish.07@...il.com>,
	Pavel Machek <pavel@....cz>,
	Casey Schaufler <casey@...aufler-ca.com>,
	akpm@...ux-foundation.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>
Subject: Re: [PATCH] Smackv10: Smack rules grammar + their stateful parser

On Tue, Nov 06, 2007 at 05:06:23PM -0800, Linus Torvalds wrote:
> 
> 
> On Wed, 7 Nov 2007, Adrian Bunk wrote:
> >
> > How should TOMOYO implement it's "match one character" in a pattern
> > (used to allow or deny access in a name-based MAC)?
> 
> .. I think such a design is fundamentally bogus. You don't have 
> "characters". You have "bytes".

Users are used to work on characters, not on bytes.

> So you either implement "match one byte", or you go crazy. It's that 
> simple.

Sure, you can limit what is possible and what not.

But there are still many pitfalls, e.g. if someone would allow the 
construct "[abc]" in patterns for matching one of these characters you'd 
have to ensure that your syntax contains explicit character delimiters 
or a pattern might match something completely different from what was 
intended.

My opinion is that extended parsing of non-ASCII strings will cause too 
many problems, but it seems we can only agree to disagree on this.

> 		Linus

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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