1 files changed, 38 insertions, 0 deletions

diff --git a/include/net/scm.h b/include/net/scm.h
index 540619cb716..5637d5e22d5 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -3,6 +3,7 @@
 
 #include <linux/limits.h>
 #include <linux/net.h>
+#include <linux/security.h>
 
 /* Well, we should have at least one descriptor open
  * to accept passed FDs 8)
@@ -19,6 +20,9 @@ struct scm_cookie
 {
 	struct ucred		creds;		/* Skb credentials	*/
 	struct scm_fp_list	*fp;		/* Passed files		*/
+#ifdef CONFIG_SECURITY_NETWORK
+	u32			secid;		/* Passed security ID 	*/
+#endif
 	unsigned long		seq;		/* Connection seqno	*/
 };
 
@@ -28,6 +32,16 @@ extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie
 extern void __scm_destroy(struct scm_cookie *scm);
 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
 
+#ifdef CONFIG_SECURITY_NETWORK
+static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
+{
+	security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
+}
+#else
+static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
+{ }
+#endif /* CONFIG_SECURITY_NETWORK */
+
 static __inline__ void scm_destroy(struct scm_cookie *scm)
 {
 	if (scm && scm->fp)
@@ -43,11 +57,33 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
 	scm->creds.pid = p->tgid;
 	scm->fp = NULL;
 	scm->seq = 0;
+	unix_get_peersec_dgram(sock, scm);
 	if (msg->msg_controllen <= 0)
 		return 0;
 	return __scm_send(sock, msg, scm);
 }
 
+#ifdef CONFIG_SECURITY_NETWORK
+static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
+{
+	char *secdata;
+	u32 seclen;
+	int err;
+
+	if (test_bit(SOCK_PASSSEC, &sock->flags)) {
+		err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
+
+		if (!err) {
+			put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
+			security_release_secctx(secdata, seclen);
+		}
+	}
+}
+#else
+static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
+{ }
+#endif /* CONFIG_SECURITY_NETWORK */
+
 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
 				struct scm_cookie *scm, int flags)
 {
@@ -62,6 +98,8 @@ static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
 	if (test_bit(SOCK_PASSCRED, &sock->flags))
 		put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
 
+	scm_passec(sock, msg, scm);
+
 	if (!scm->fp)
 		return;