netdev - Re: [PATCH 1/3] Security: Add prctl(PR_{GET,SET}

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Message-ID: <m2pr653s1l.fsf@ssh.synack.fr>
Date:	Thu, 24 Dec 2009 05:38:30 +0100
From:	Samir Bellabes <sam@...ack.fr>
To:	Michael Stone <michael@...top.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, David Lang <david@...g.hm>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Bryan Donlan <bdonlan@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	James Morris <jmorris@...ei.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Mark Seaborn <mrs@...hic-beasts.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Américo Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH 1/3] Security: Add prctl(PR_{GET,SET}_NETWORK) interface. (v3)

Michael Stone <michael@...top.org> writes:

> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index f2f842d..0c65c55 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1402,6 +1402,8 @@ struct task_struct {
>   	unsigned int sessionid;
>   #endif
>   	seccomp_t seccomp;
> +/* Flags for limiting networking via prctl(PR_SET_NETWORK). */
> +  unsigned long network;
>   
>   /* Thread group tracking */
>      	u32 parent_exec_id;

I think this is unnecessary, as LSM module, you should use the
void* security member of the structure cred. 

this member allows you to mark task_struct as you which, it's a kind of
abstraction provided to all security modules.
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