linux-kernel - Re: [TOMOYO #9 (2.6.27-rc7-mm1) 1/6] LSM adapter functions.

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Message-ID: <62704.1222837526@turing-police.cc.vt.edu>
Date:	Wed, 01 Oct 2008 01:05:26 -0400
From:	Valdis.Kletnieks@...edu
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Kentaro Takeda <takedakn@...data.co.jp>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, haradats@...data.co.jp,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [TOMOYO #9 (2.6.27-rc7-mm1) 1/6] LSM adapter functions.

On Tue, 30 Sep 2008 19:33:32 PDT, Casey Schaufler said:
> I have always believed that MAC should come first, then DAC, because
> MAC may care if you can see the mode bits. The current DAC before MAC
> is an artifact of the desire for the LSM to behave cleanly as a
> strictly additional mechanism. From an ideal security perspective
> MAC should be first, but the pragmatic DAC first isn't going to cause
> too much grief. If Tomoyo wants to do what I think is the right thing,
> well, it's OK with me.

I'm OK with the MAC going first as well - but unless/until we convert the
rest of the kernel to do MAC-before-DAC, somebody better leave a comment:

/* Yes, this one spot *is* doing MAC-first intentionally */

or similar, just so we don't keep getting patches to "fix" it to DAC-first...

(And yes, newbie janitors *will* submit patches like that - how many times
have we had the 'ndiswrapper-taint-flag' flame war now?)

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