netdev - Re: commit b9ef5513c99b breaks ping to ipv6 linklocal addresses on debian buster

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Date:   Sun, 5 Jan 2020 21:20:48 -0700
From:   David Ahern <dsahern@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Casey Schaufler <casey@...aufler-ca.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: commit b9ef5513c99b breaks ping to ipv6 linklocal addresses on
 debian buster

On 1/5/20 8:51 PM, Tetsuo Handa wrote:
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index ecea41ce919b..5b2177724d5e 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -2810,7 +2810,7 @@ static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
>  	if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) {
>  		if (addrlen < SIN6_LEN_RFC2133 ||
>  		    address->sa_family != AF_INET6)
> -			return -EINVAL;
> +			return 0;
>  		smk_ipv6_port_label(sock, address);
>  	}
>  	return 0;
> 

Hi:

The failure is the connect function, not the bind.

This change seems more appropriate to me (and fixes the failure):

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index ecea41ce919b..ce5e3be7c111 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2854,7 +2854,7 @@ static int smack_socket_connect(struct socket
*sock, struct sockaddr *sap,
                rc = smack_netlabel_send(sock->sk, (struct sockaddr_in
*)sap);
                break;
        case PF_INET6:
-               if (addrlen < SIN6_LEN_RFC2133 || sap->sa_family !=
AF_INET6)
+               if (addrlen < SIN6_LEN_RFC2133)
                        return -EINVAL;
 #ifdef SMACK_IPV6_SECMARK_LABELING
                rsp = smack_ipv6host_label(sip);


ie., if the socket family is AF_INET6 the address length should be an
IPv6 address. The family in the sockaddr is not as important.