linux-kernel - Re: [PATCH (mmotm-2008-12-02-17-08)] Introducesecurity_path

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Message-Id: <200812050641.IHC43259.QSOMFLFOHFJtOV@I-love.SAKURA.ne.jp>
Date:	Fri, 5 Dec 2008 06:41:32 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	serue@...ibm.com
Cc:	sds@...ho.nsa.gov, jmorris@...ei.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, takedakn@...data.co.jp,
	haradats@...data.co.jp, penguin-kernel@...ove.SAKURA.ne.jp
Subject: Re: [PATCH (mmotm-2008-12-02-17-08)] Introducesecurity_path_set/clear() hooks.

Hello.

Serge E. Hallyn wrote:
> > Right. Locations of inserting security_path_set()/security_path_clear() pairs
> > are subset of mnt_want_write()/mnt_drop_write() pairs. Thus, we can insert
> > security_path_set()/security_path_clear() pairs into
> > mnt_want_write()/mnt_drop_write() pairs, if we can tolerate performance
> > regression. According to our rough measurement, there is about 8 - 22% of
> > performance regression.
> 
> ... compared to what, exactly?
> 
> If having CONFIG_SECURITY_PATH=y but TOMOYO  disabled has this kind of
> regression against just not having CONFIG_SECURITY_PATH, then no that is
> not acceptable.
> 
Comparison between a module using mnt_path.c and a module not using mnt_path.c .
If mp_update_mnt_path() is not called, there is no performance regression.
TOMOYO will need mp_update_mnt_path().

Regards.
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