netdev - Re: [PATCH v2 net-next 17/23] net/namespace: Update rtnl_net

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Message-ID: <20181008105430.cnpflmfwhkn3u2lq@brauner.io>
Date:   Mon, 8 Oct 2018 12:54:31 +0200
From:   Christian Brauner <christian@...uner.io>
To:     David Ahern <dsahern@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jbenc@...hat.com,
        stephen@...workplumber.org, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH v2 net-next 17/23] net/namespace: Update rtnl_net_dumpid
 for strict data checking

On Sun, Oct 07, 2018 at 08:16:38PM -0700, David Ahern wrote:
> From: David Ahern <dsahern@...il.com>
> 
> Update rtnl_net_dumpid for strict data checking. If the flag is set,
> the dump request is expected to have an rtgenmsg struct as the header
> which has the family as the only element. No data may be appended.
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  net/core/net_namespace.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
> index 670c84b1bfc2..fefe72774aeb 100644
> --- a/net/core/net_namespace.c
> +++ b/net/core/net_namespace.c
> @@ -853,6 +853,12 @@ static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
>  		.s_idx = cb->args[0],
>  	};
>  
> +	if (cb->strict_check &&

Hm, shouldn't this also verify that the passed header is indeed struct
rtgenmsg before checking whether there are any attributes?

> +	    nlmsg_attrlen(cb->nlh, sizeof(struct rtgenmsg))) {
> +			NL_SET_ERR_MSG(cb->extack, "Unknown data in network namespace id dump request");
> +			return -EINVAL;
> +	}
> +
>  	spin_lock_bh(&net->nsid_lock);
>  	idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
>  	spin_unlock_bh(&net->nsid_lock);
> -- 
> 2.11.0
>