linux-kernel - Re: RFC: disablenetwork facility. (v4)

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Message-ID: <20091227083857.GC11737@elf.ucw.cz>
Date:	Sun, 27 Dec 2009 09:38:57 +0100
From:	Pavel Machek <pavel@....cz>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	michael@...top.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
	andi@...stfloor.org, david@...g.hm, socketcan@...tkopp.net,
	alan@...rguk.ukuu.org.uk, herbert@...dor.apana.org.au,
	Valdis.Kletnieks@...edu, bdonlan@...il.com, zbr@...emap.net,
	cscott@...ott.net, jmorris@...ei.org, ebiederm@...ssion.com,
	bernie@...ewiz.org, mrs@...hic-beasts.com, randy.dunlap@...cle.com,
	xiyou.wangcong@...il.com, sam@...ack.fr, casey@...aufler-ca.com,
	serue@...ibm.com
Subject: Re: RFC: disablenetwork facility. (v4)

On Sun 2009-12-27 17:36:48, Tetsuo Handa wrote:
> Michael Stone wrote:
> > Further suggestions?
> 
> I expect that the future figure of this "disablenetwork" functionality becomes
> "disablesyscall" functionality.
> 
> What about defining two types of masks, one is applied throughout the rest of
> the task_struct's lifetime (inheritable mask), the other is cleared when
> execve() succeeds (local mask)?
> 
> When an application is sure that "I know I don't need to call execve()" or
> "I know execve()d programs need not to call ...()" or "I want execve()d
> programs not to call ...()", the application sets inheritable mask.
> When an application is not sure about what syscalls the execve()d programs
> will call but is sure that "I know I don't need to call ...()", the application
> sets local mask.

Syscalls are very wrong granularity for security system. But easy to
implement, see seccomp.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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