linux-kernel - [PATCH 01/10] sock: move sock_init_peercred() from af

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Date:   Thu, 21 Oct 2021 16:37:05 +0400
From:   Marc-André Lureau <marcandre.lureau@...hat.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, sgarzare@...hat.com,
        davem@...emloft.net, kuba@...nel.org,
        Marc-André Lureau <marcandre.lureau@...hat.com>
Subject: [PATCH 01/10] sock: move sock_init_peercred() from af_unix

SO_PEERCRED can be made to work with other kind of sockets.

Signed-off-by: Marc-André Lureau <marcandre.lureau@...hat.com>
---
 include/net/sock.h |  3 +++
 net/core/sock.c    | 17 +++++++++++++++++
 net/unix/af_unix.c | 24 ++++--------------------
 3 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index ea6fbc88c8f9..8b12953752e6 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1816,6 +1816,9 @@ void sk_common_release(struct sock *sk);
 /* Initialise core socket variables */
 void sock_init_data(struct socket *sock, struct sock *sk);
 
+/* Set socket peer PID and credentials with current process. */
+void sock_init_peercred(struct sock *sk);
+
 /*
  * Socket reference counting postulates.
  *
diff --git a/net/core/sock.c b/net/core/sock.c
index c1601f75ec4b..997e8d256e2f 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3197,6 +3197,23 @@ void sock_init_data(struct socket *sock, struct sock *sk)
 }
 EXPORT_SYMBOL(sock_init_data);
 
+void sock_init_peercred(struct sock *sk)
+{
+	const struct cred *old_cred;
+	struct pid *old_pid;
+
+	spin_lock(&sk->sk_peer_lock);
+	old_pid = sk->sk_peer_pid;
+	old_cred = sk->sk_peer_cred;
+	sk->sk_peer_pid  = get_pid(task_tgid(current));
+	sk->sk_peer_cred = get_current_cred();
+	spin_unlock(&sk->sk_peer_lock);
+
+	put_pid(old_pid);
+	put_cred(old_cred);
+}
+EXPORT_SYMBOL(sock_init_peercred);
+
 void lock_sock_nested(struct sock *sk, int subclass)
 {
 	/* The sk_lock has mutex_lock() semantics here. */
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 89f9e85ae970..e56f320dff20 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -606,22 +606,6 @@ static void unix_release_sock(struct sock *sk, int embrion)
 		unix_gc();		/* Garbage collect fds */
 }
 
-static void init_peercred(struct sock *sk)
-{
-	const struct cred *old_cred;
-	struct pid *old_pid;
-
-	spin_lock(&sk->sk_peer_lock);
-	old_pid = sk->sk_peer_pid;
-	old_cred = sk->sk_peer_cred;
-	sk->sk_peer_pid  = get_pid(task_tgid(current));
-	sk->sk_peer_cred = get_current_cred();
-	spin_unlock(&sk->sk_peer_lock);
-
-	put_pid(old_pid);
-	put_cred(old_cred);
-}
-
 static void copy_peercred(struct sock *sk, struct sock *peersk)
 {
 	const struct cred *old_cred;
@@ -666,7 +650,7 @@ 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 */
-	init_peercred(sk);
+	sock_init_peercred(sk);
 	err = 0;
 
 out_unlock:
@@ -1446,7 +1430,7 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 	unix_peer(newsk)	= sk;
 	newsk->sk_state		= TCP_ESTABLISHED;
 	newsk->sk_type		= sk->sk_type;
-	init_peercred(newsk);
+	sock_init_peercred(newsk);
 	newu = unix_sk(newsk);
 	RCU_INIT_POINTER(newsk->sk_wq, &newu->peer_wq);
 	otheru = unix_sk(other);
@@ -1518,8 +1502,8 @@ static int unix_socketpair(struct socket *socka, struct socket *sockb)
 	sock_hold(skb);
 	unix_peer(ska) = skb;
 	unix_peer(skb) = ska;
-	init_peercred(ska);
-	init_peercred(skb);
+	sock_init_peercred(ska);
+	sock_init_peercred(skb);
 
 	ska->sk_state = TCP_ESTABLISHED;
 	skb->sk_state = TCP_ESTABLISHED;
-- 
2.33.0.721.g106298f7f9