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 087BE168CF for ; Mon, 8 May 2023 11:17:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81299C433EF; Mon, 8 May 2023 11:17:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683544654; bh=jyKiYOIG4Fdb+UEAd2DnaLU/27tPCePGWURpg8OEK+4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1ebR1N1p4JZxTBybBZkb2A8YbU4kIeALw6zH1B1w6f4sL7q1t3SFuFAX7a3dNAP38 8RKY1Lka+42p15Fesc7YVtUXv4tn7gGU6/mDctDfqJZJB5QhWTaGsbhIXr1f1ohsJR 0mRAeB8jZRgfJ4WZZprzkRvpiZ2Xmy+Naqj0H5/8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?St=C3=A9phane=20Graber?= , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 6.3 451/694] netfilter: conntrack: restore IPS_CONFIRMED out of nf_conntrack_hash_check_insert() Date: Mon, 8 May 2023 11:44:46 +0200 Message-Id: <20230508094448.202501993@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094432.603705160@linuxfoundation.org> References: <20230508094432.603705160@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 [ Upstream commit 2cdaa3eefed83082923cf219c8b6a314e622da74 ] e6d57e9ff0ae ("netfilter: conntrack: fix rmmod double-free race") consolidates IPS_CONFIRMED bit set in nf_conntrack_hash_check_insert(). However, this breaks ctnetlink: # conntrack -I -p tcp --timeout 123 --src 1.2.3.4 --dst 5.6.7.8 --state ESTABLISHED --sport 1 --dport 4 -u SEEN_REPLY conntrack v1.4.6 (conntrack-tools): Operation failed: Device or resource busy This is a partial revert of the aforementioned commit to restore IPS_CONFIRMED. Fixes: e6d57e9ff0ae ("netfilter: conntrack: fix rmmod double-free race") Reported-by: Stéphane Graber Tested-by: Stéphane Graber Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_conntrack_bpf.c | 1 + net/netfilter/nf_conntrack_core.c | 1 - net/netfilter/nf_conntrack_netlink.c | 3 +++ 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_conntrack_bpf.c b/net/netfilter/nf_conntrack_bpf.c index cd99e6dc1f35c..34913521c385a 100644 --- a/net/netfilter/nf_conntrack_bpf.c +++ b/net/netfilter/nf_conntrack_bpf.c @@ -381,6 +381,7 @@ __bpf_kfunc struct nf_conn *bpf_ct_insert_entry(struct nf_conn___init *nfct_i) struct nf_conn *nfct = (struct nf_conn *)nfct_i; int err; + nfct->status |= IPS_CONFIRMED; err = nf_conntrack_hash_check_insert(nfct); if (err < 0) { nf_conntrack_free(nfct); diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index c6a6a6099b4e2..7ba6ab9b54b56 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -932,7 +932,6 @@ nf_conntrack_hash_check_insert(struct nf_conn *ct) goto out; } - ct->status |= IPS_CONFIRMED; smp_wmb(); /* The caller holds a reference to this object */ refcount_set(&ct->ct_general.use, 2); diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index bfc3aaa2c872b..d3ee188546982 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -2316,6 +2316,9 @@ ctnetlink_create_conntrack(struct net *net, nfct_seqadj_ext_add(ct); nfct_synproxy_ext_add(ct); + /* we must add conntrack extensions before confirmation. */ + ct->status |= IPS_CONFIRMED; + if (cda[CTA_STATUS]) { err = ctnetlink_change_status(ct, cda); if (err < 0) -- 2.39.2