4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 660899ddf06ae8bb5bbbd0a19418b739375430c5 ]
After moving an XFRM interface to another namespace it stays associated with the original namespace (net in `struct xfrm_if` and the list keyed with `xfrmi_net_id`), allowing processes in the new namespace to use SAs/policies that were created in the original namespace. For instance, this allows a keying daemon in one namespace to establish IPsec SAs for other namespaces without processes there having access to the keys or IKE credentials.
This worked fine for outbound traffic, however, for inbound traffic the lookup for the interfaces and the policies used the incorrect namespace (the one the XFRM interface was moved to).
Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces") Signed-off-by: Tobias Brunner tobias@strongswan.org Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/xfrm/xfrm_interface.c | 4 ++-- net/xfrm/xfrm_policy.c | 4 +++- 2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c index 6f05e831a73e..82723ef44db3 100644 --- a/net/xfrm/xfrm_interface.c +++ b/net/xfrm/xfrm_interface.c @@ -76,10 +76,10 @@ static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb) int ifindex; struct xfrm_if *xi;
- if (!skb->dev) + if (!secpath_exists(skb) || !skb->dev) return NULL;
- xfrmn = net_generic(dev_net(skb->dev), xfrmi_net_id); + xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id); ifindex = skb->dev->ifindex;
for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 6ea8036fcdbe..bf5d59270f79 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2340,8 +2340,10 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
if (ifcb) { xi = ifcb->decode_session(skb); - if (xi) + if (xi) { if_id = xi->p.if_id; + net = xi->net; + } } rcu_read_unlock();