[PATCH] netlabel: If PF_INET6, check sk

Paul Moore

2018-02-14 19:03:28 UTC

Post by Paul Moore
On Mon, Nov 13, 2017 at 3:54 PM, Richard Haines

When resolving a fallback label, check the sk_buff version as it
is possible (e.g. SCTP) to have family = PF_INET6 while
receiving ip_hdr(skb)->version = 4.
---
net/netlabel/netlabel_unlabeled.c | 10 ++++++++++
1 file changed, 10 insertions(+)

Thanks Richard.

I don't believe the netdev folks picked this up, but I haven't heard
any objections (and I can't imagine there would be any) so I'm going
to go ahead and pull this into the selinux/next tree.

Post by Paul Moore

diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 22dc1b9..c070dfc 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -1472,6 +1472,16 @@ int netlbl_unlabel_getattr(const struct sk_buff *skb,
iface = rcu_dereference(netlbl_unlhsh_def);
if (iface == NULL || !iface->valid)
goto unlabel_getattr_nolabel;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ /* When resolving a fallback label, check the sk_buff version as
+ * it is possible (e.g. SCTP) to have family = PF_INET6 while
+ * receiving ip_hdr(skb)->version = 4.
+ */
+ if (family == PF_INET6 && ip_hdr(skb)->version == 4)
+ family = PF_INET;
+#endif /* IPv6 */
+
switch (family) {
case PF_INET: {
struct iphdr *hdr4;
--
2.13.6

--
paul moore
www.paul-moore.com