linux-kernel - Re: [PATCH v5] audit: log nftables configuration change events once per table

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Date:   Wed, 31 Mar 2021 22:46:35 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netfilter-devel@...r.kernel.org, Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...isplace.org>,
        Steve Grubb <sgrubb@...hat.com>,
        Florian Westphal <fw@...len.de>, Phil Sutter <phil@....cc>,
        twoerner@...hat.com, tgraf@...radead.org, dan.carpenter@...cle.com,
        Jones Desougi <jones.desougi+netfilter@...il.com>
Subject: Re: [PATCH v5] audit: log nftables configuration change events once
 per table

On Fri, Mar 26, 2021 at 01:38:59PM -0400, Richard Guy Briggs wrote:
> @@ -8006,12 +7966,65 @@ static void nft_commit_notify(struct net *net, u32 portid)
>  	WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
>  }
>  
> +static int nf_tables_commit_audit_alloc(struct list_head *adl,
> +				 struct nft_table *table)
> +{
> +	struct nft_audit_data *adp;
> +
> +	list_for_each_entry(adp, adl, list) {
> +		if (adp->table == table)
> +			return 0;
> +	}
> +	adp = kzalloc(sizeof(*adp), GFP_KERNEL);
> +	if (!adp)
> +		return -ENOMEM;
> +	adp->table = table;
> +	INIT_LIST_HEAD(&adp->list);

This INIT_LIST_HEAD is not required for an object that is going to be
inserted into the 'adl' list.

> +	list_add(&adp->list, adl);

If no objections, I'll amend this patch. I'll include the UAF fix and
remove this unnecessary INIT_LIST_HEAD.