linux-kernel - Re: [PATCH] netlink: have netlink per-protocol bind function return an error code.

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Message-Id: <20140323.005010.1898428719601246326.davem@davemloft.net>
Date:	Sun, 23 Mar 2014 00:50:10 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	rgb@...hat.com
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	eparis@...hat.com, sgrubb@...hat.com, hadi@...atatu.com
Subject: Re: [PATCH] netlink: have netlink per-protocol bind function
 return an error code.

From: Richard Guy Briggs <rgb@...hat.com>
Date: Fri, 21 Mar 2014 12:39:11 -0400

> @@ -1441,6 +1441,17 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
>  	if (!nladdr->nl_groups && (nlk->groups == NULL || !(u32)nlk->groups[0]))
>  		return 0;
>  
> +	if (nlk->netlink_bind && nladdr->nl_groups) {
> +		int i;
> +
> +		for (i = 0; i < nlk->ngroups; i++)
> +			if (test_bit(i, (long unsigned int *)&nladdr->nl_groups)) {
> +				err = nlk->netlink_bind(i);
> +				if (err)
> +					return err;
> +			}
> +	}
> +

You can't just leave a partially set of completed bindings in place.

It's not valid to leave half-baked state like this.

If you return an error, all of the binding state changes must be
completely undone.

If you can't find a way to do this cleanly, you'll need to find
a way for the audit code to not return an error.
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