From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0786CC04E69 for ; Tue, 25 Jul 2023 11:26:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234565AbjGYL04 (ORCPT ); Tue, 25 Jul 2023 07:26:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234575AbjGYL0y (ORCPT ); Tue, 25 Jul 2023 07:26:54 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D32313D; Tue, 25 Jul 2023 04:26:53 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 702D66168E; Tue, 25 Jul 2023 11:26:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BDF0C433C7; Tue, 25 Jul 2023 11:26:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690284411; bh=Xbti8q72A3/BNyfNG+BzxbimULA3PDI6eruabP8UoOw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yroxO/vszjOQm+UJe3Ay4vv2ituRpcJmGhrMzoUa0BA8CKfZL9x4zRnElampoyOIz iE2TlJaYH6T+fU8CihqYgo0isI/hupDMGm5I8+NX8XTVP4ZWHFJeDBlZxK7+AJ1iK8 155+RRKUyZBLs9u1RHRdXFYq+OkdpMZWomit4KCw= From: Greg Kroah-Hartman To: stable@vger.kernel.org, netfilter-devel@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pablo Neira Ayuso Subject: [PATCH 5.10 317/509] netfilter: nf_tables: reject unbound anonymous set before commit phase Date: Tue, 25 Jul 2023 12:44:16 +0200 Message-ID: <20230725104608.229411172@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725104553.588743331@linuxfoundation.org> References: <20230725104553.588743331@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org From: Pablo Neira Ayuso [ Upstream commit 938154b93be8cd611ddfd7bafc1849f3c4355201 ] Add a new list to track set transaction and to check for unbound anonymous sets before entering the commit phase. Bail out at the end of the transaction handling if an anonymous set remains unbound. Fixes: 96518518cc41 ("netfilter: add nftables") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- include/net/netfilter/nf_tables.h | 3 +++ net/netfilter/nf_tables_api.c | 34 +++++++++++++++++++++++++++++++--- 2 files changed, 34 insertions(+), 3 deletions(-) --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -1426,6 +1426,7 @@ static inline void nft_set_elem_clear_bu * struct nft_trans - nf_tables object update in transaction * * @list: used internally + * @binding_list: list of objects with possible bindings * @msg_type: message type * @put_net: ctx->net needs to be put * @ctx: transaction context @@ -1433,6 +1434,7 @@ static inline void nft_set_elem_clear_bu */ struct nft_trans { struct list_head list; + struct list_head binding_list; int msg_type; bool put_net; struct nft_ctx ctx; @@ -1559,6 +1561,7 @@ __be64 nf_jiffies64_to_msecs(u64 input); struct nftables_pernet { struct list_head tables; struct list_head commit_list; + struct list_head binding_list; struct list_head module_list; struct list_head notify_list; struct mutex commit_mutex; --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -155,6 +155,7 @@ static struct nft_trans *nft_trans_alloc return NULL; INIT_LIST_HEAD(&trans->list); + INIT_LIST_HEAD(&trans->binding_list); trans->msg_type = msg_type; trans->ctx = *ctx; @@ -167,9 +168,15 @@ static struct nft_trans *nft_trans_alloc return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); } -static void nft_trans_destroy(struct nft_trans *trans) +static void nft_trans_list_del(struct nft_trans *trans) { list_del(&trans->list); + list_del(&trans->binding_list); +} + +static void nft_trans_destroy(struct nft_trans *trans) +{ + nft_trans_list_del(trans); kfree(trans); } @@ -347,6 +354,14 @@ static void nft_trans_commit_list_add_ta struct nftables_pernet *nft_net; nft_net = net_generic(net, nf_tables_net_id); + + switch (trans->msg_type) { + case NFT_MSG_NEWSET: + if (nft_set_is_anonymous(nft_trans_set(trans))) + list_add_tail(&trans->binding_list, &nft_net->binding_list); + break; + } + list_add_tail(&trans->list, &nft_net->commit_list); } @@ -7717,7 +7732,7 @@ static void nf_tables_trans_destroy_work synchronize_rcu(); list_for_each_entry_safe(trans, next, &head, list) { - list_del(&trans->list); + nft_trans_list_del(trans); nft_commit_release(trans); } } @@ -8019,6 +8034,18 @@ static int nf_tables_commit(struct net * return 0; } + list_for_each_entry(trans, &nft_net->binding_list, binding_list) { + switch (trans->msg_type) { + case NFT_MSG_NEWSET: + if (nft_set_is_anonymous(nft_trans_set(trans)) && + !nft_trans_set_bound(trans)) { + pr_warn_once("nftables ruleset with unbound set\n"); + return -EINVAL; + } + break; + } + } + /* 0. Validate ruleset, otherwise roll back for error reporting. */ if (nf_tables_validate(net) < 0) return -EAGAIN; @@ -8421,7 +8448,7 @@ static int __nf_tables_abort(struct net list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list, list) { - list_del(&trans->list); + nft_trans_list_del(trans); nf_tables_abort_release(trans); } @@ -9120,6 +9147,7 @@ static int __net_init nf_tables_init_net INIT_LIST_HEAD(&nft_net->tables); INIT_LIST_HEAD(&nft_net->commit_list); + INIT_LIST_HEAD(&nft_net->binding_list); INIT_LIST_HEAD(&nft_net->module_list); INIT_LIST_HEAD(&nft_net->notify_list); mutex_init(&nft_net->commit_mutex);