From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxx>
Tested-by: Stéphane Graber <stgraber@xxxxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 e1af14e3b63c5..24002bc61e07e 100644
--- a/net/netfilter/nf_conntrack_bpf.c
+++ b/net/netfilter/nf_conntrack_bpf.c
@@ -381,6 +381,7 @@ 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);
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 19e3afb23fdaf..cf731546e865b 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -934,7 +934,6 @@ 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 d095d3c1ceca6..a68391e228f0e 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
