diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2023-04-18 23:31:26 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2023-04-19 10:07:59 +0200 |
| commit | 2cdaa3eefed83082923cf219c8b6a314e622da74 (patch) | |
| tree | 0a1a923ba40879e7603b4c097ea197572de0b9b6 /net/netfilter | |
| parent | 92e8c732d8518588ac34b4cb3feaf37d2cb87555 (diff) | |
netfilter: conntrack: restore IPS_CONFIRMED out of nf_conntrack_hash_check_insert()
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>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nf_conntrack_bpf.c | 1 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_core.c | 1 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_netlink.c | 3 |
3 files changed, 4 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_bpf.c b/net/netfilter/nf_conntrack_bpf.c index cd99e6dc1f35..34913521c385 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 c6a6a6099b4e..7ba6ab9b54b5 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 bfc3aaa2c872..d3ee18854698 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) |