From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 157E6611A for ; Sun, 28 May 2023 19:15:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 970C7C433EF; Sun, 28 May 2023 19:15:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1685301317; bh=ZrgvYMZ7dUYviZ/NCUj5O0qXO6Zjsj3iW0k25R5z5Bc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OVWp8KcM/c87rGKntGxO2FTF1b0C/b/8dHJMaiDNk1L7y2v4C9U2w/Z47PnfmnV/f FwxxZ8gA0G8hUJ+OibpJAD1wldS0d5XLfI3iF4AqT+5xcOnprydnSOwals1Sekdzip zD1ao5hPlkzshekhzJwO1UK/nOzWFFWSIeibvIeQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org, netfilter-devel@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thadeu Lima de Souza Cascardo , Pablo Neira Ayuso Subject: [PATCH 4.14 68/86] netfilter: nf_tables: do not allow RULE_ID to refer to another chain Date: Sun, 28 May 2023 20:10:42 +0100 Message-Id: <20230528190831.159343774@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230528190828.564682883@linuxfoundation.org> References: <20230528190828.564682883@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pablo Neira Ayuso [ 36d5b2913219ac853908b0f1c664345e04313856 ] When doing lookups for rules on the same batch by using its ID, a rule from a different chain can be used. If a rule is added to a chain but tries to be positioned next to a rule from a different chain, it will be linked to chain2, but the use counter on chain1 would be the one to be incremented. When looking for rules by ID, use the chain that was used for the lookup by name. The chain used in the context copied to the transaction needs to match that same chain. That way, struct nft_rule does not need to get enlarged with another member. Fixes: 1a94e38d254b ("netfilter: nf_tables: add NFTA_RULE_ID attribute") Fixes: 75dd48e2e420 ("netfilter: nf_tables: Support RULE_ID reference in new rule") Signed-off-by: Thadeu Lima de Souza Cascardo Cc: Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nf_tables_api.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -2475,6 +2475,7 @@ err1: } static struct nft_rule *nft_rule_lookup_byid(const struct net *net, + const struct nft_chain *chain, const struct nlattr *nla) { u32 id = ntohl(nla_get_be32(nla)); @@ -2484,6 +2485,7 @@ static struct nft_rule *nft_rule_lookup_ struct nft_rule *rule = nft_trans_rule(trans); if (trans->msg_type == NFT_MSG_NEWRULE && + trans->ctx.chain == chain && id == nft_trans_rule_id(trans)) return rule; } @@ -2530,7 +2532,7 @@ static int nf_tables_delrule(struct net err = nft_delrule(&ctx, rule); } else if (nla[NFTA_RULE_ID]) { - rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); + rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]); if (IS_ERR(rule)) return PTR_ERR(rule);