netdev - Re: [PATCH 2/10] Fix leaking of kernel heap addresses in net/

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Message-ID: <20101111171754.0198e151@nehalam>
Date:	Thu, 11 Nov 2010 17:17:54 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Urs Thuermann <urs.thuermann@...kswagen.de>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	James Morris <jmorris@...ei.org>,
	Remi Denis-Courmont <remi.denis-courmont@...ia.com>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Sridhar Samudrala <sri@...ibm.com>,
	Vlad Yasevich <vladislav.yasevich@...com>,
	Tejun Heo <tj@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Li Zefan <lizf@...fujitsu.com>, Joe Perches <joe@...ches.com>,
	Jamal Hadi Salim <hadi@...atatu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Jiri Pirko <jpirko@...hat.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Pavel Emelyanov <xemul@...nvz.org>,
	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.o, rg@...l.vyatta.com
Subject: Re: [PATCH 2/10] Fix leaking of kernel heap addresses in net/

On Thu, 11 Nov 2010 20:06:59 -0500
Dan Rosenberg <drosenberg@...curity.com> wrote:

> diff --git a/net/can/bcm.c b/net/can/bcm.c
> index 08ffe9e..5960ad7 100644
> --- a/net/can/bcm.c
> +++ b/net/can/bcm.c
> @@ -165,9 +165,16 @@ static int bcm_proc_show(struct seq_file *m, void *v)
>  	struct bcm_sock *bo = bcm_sk(sk);
>  	struct bcm_op *op;
>  
> -	seq_printf(m, ">>> socket %p", sk->sk_socket);
> -	seq_printf(m, " / sk %p", sk);
> -	seq_printf(m, " / bo %p", bo);
> +	/* Only expose kernel addresses to privileged readers */
> +	if (capable(CAP_NET_ADMIN))
> +		seq_printf(m, ">>> socket %p", sk->sk_socket);
> +		seq_printf(m, " / sk %p", sk);
> +		seq_printf(m, " / bo %p", bo);
> +	else
> +		seq_printf(m, ">>> socket %lu", sock_i_ino(sk));
> +		seq_printf(m, " / sk %d", 0);
> +		seq_printf(m, " / bo %d", 0);
> +

Printing different data based on security state seems like an ABI
nightmare.


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