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netfilter: conntrack: restore IPS_CONFIRMED out of nf_conntrack_hash_check_insert()

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[ 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 <stgraber@stgraber.org>
Tested-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2023-04-18 23:31:26 +02:00 • committed by Greg Kroah-Hartman
parent d6e03af0a4
commit 6a62a2a09c
3 changed files with 4 additions and 1 deletions
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1
net/netfilter/nf_conntrack_bpf.c
View file

@ -384,6 +384,7 @@ 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);

1
net/netfilter/nf_conntrack_core.c
View file

@ -938,7 +938,6 @@ 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);

3
net/netfilter/nf_conntrack_netlink.c
View file

@ -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)