[NET]: Use task->tgid instead of task->pid in SCM credentials code.

include/net/scm.h

@@ -39,7 +39,7 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
 	memset(scm, 0, sizeof(*scm));
 	scm->creds.uid = current->uid;
 	scm->creds.gid = current->gid;
-	scm->creds.pid = current->pid;
+	scm->creds.pid = current->tgid;
 	if (msg->msg_controllen <= 0)
 		return 0;
 	return __scm_send(sock, msg, scm);

net/unix/af_unix.c

@@ -448,7 +448,7 @@ static int unix_listen(struct socket *sock, int backlog)
 	sk->sk_max_ack_backlog	= backlog;
 	sk->sk_state		= TCP_LISTEN;
 	/* set credentials so connect can copy them */
-	sk->sk_peercred.pid	= current->pid;
+	sk->sk_peercred.pid	= current->tgid;
 	sk->sk_peercred.uid	= current->euid;
 	sk->sk_peercred.gid	= current->egid;
 	err = 0;
@@ -983,7 +983,7 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 	unix_peer(newsk)	= sk;
 	newsk->sk_state		= TCP_ESTABLISHED;
 	newsk->sk_type		= SOCK_STREAM;
-	newsk->sk_peercred.pid	= current->pid;
+	newsk->sk_peercred.pid	= current->tgid;
 	newsk->sk_peercred.uid	= current->euid;
 	newsk->sk_peercred.gid	= current->egid;
 	newu = unix_sk(newsk);
@@ -1045,7 +1045,7 @@ static int unix_socketpair(struct socket *socka, struct socket *sockb)
 	sock_hold(skb);
 	unix_peer(ska)=skb;
 	unix_peer(skb)=ska;
-	ska->sk_peercred.pid = skb->sk_peercred.pid = current->pid;
+	ska->sk_peercred.pid = skb->sk_peercred.pid = current->tgid;
 	ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid;
 	ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid;