netdev - Re: [RFC PATCH 13/17] calipso: Allow request sockets to be relabelled by the lsm.

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Date:	Tue, 22 Dec 2015 14:40:02 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Huw Davies <huw@...eweavers.com>, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov
Cc:	Paul Moore <pmoore@...hat.com>
Subject: Re: [RFC PATCH 13/17] calipso: Allow request sockets to be relabelled
 by the lsm.

On 22.12.2015 12:46, Huw Davies wrote:
>  	tot_len += sizeof(*opt2);
> -	opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
> +	if (sk)
> +		opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
> +	else
> +		opt2 = kmalloc(tot_len, GFP_ATOMIC);
>  	if (!opt2)
>  		return ERR_PTR(-ENOBUFS);

This change looks dangerous to me in terms of control of memory
depletion from a remote host. Could you use sk_to_full_sk and account
options towards the listener socket?

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