linux-kernel - [PATCH 2/3] net/unix: hook unix

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Message-Id: <20180423133015.5455-3-dh.herrmann@gmail.com>
Date:   Mon, 23 Apr 2018 15:30:14 +0200
From:   David Herrmann <dh.herrmann@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     James Morris <jmorris@...ei.org>, Paul Moore <paul@...l-moore.com>,
        teg@...m.no, Stephen Smalley <sds@...ho.nsa.gov>,
        selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org,
        Eric Paris <eparis@...isplace.org>, serge@...lyn.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        David Herrmann <dh.herrmann@...il.com>
Subject: [PATCH 2/3] net/unix: hook unix_socketpair() into LSM

Use the newly created LSM-hook for unix_socketpair(). The default hook
return-value is 0, so behavior stays the same unless LSMs start using
this hook.

Signed-off-by: David Herrmann <dh.herrmann@...il.com>
---
 net/unix/af_unix.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 68bb70a62afe..bc9705ace9b1 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1371,6 +1371,11 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 static int unix_socketpair(struct socket *socka, struct socket *sockb)
 {
 	struct sock *ska = socka->sk, *skb = sockb->sk;
+	int err;
+
+	err = security_unix_stream_socketpair(ska, skb);
+	if (err)
+		return err;
 
 	/* Join our sockets back to back */
 	sock_hold(ska);
-- 
2.17.0