Smack: Fix IPv6 handling of 0 secmark

Handle the case where the skb for an IPv6 packet contains a 0 in the secmark for a packet generated locally. This can only happen for system packets, so allow the access. Signed-off-by: Casey Schaufler <[email protected]>
Kleist · Apr 3, 2019 · f7450bc · f7450bc
1 parent 4e328b0
commit f7450bc
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
@@ -3907,6 +3907,8 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 #ifdef SMACK_IPV6_SECMARK_LABELING
 		if (skb && skb->secmark != 0)
 			skp = smack_from_secid(skb->secmark);
+		else if (smk_ipv6_localhost(&sadd))
+			break;
 		else
 			skp = smack_ipv6host_label(&sadd);
 		if (skp == NULL)