@@ -733,6 +733,12 @@ static void unix_release_sock(struct sock *sk, int embrion)
}
static void init_peercred(struct sock *sk)
+{
+ sk->sk_peer_pid = get_pid(task_tgid(current));
+ sk->sk_peer_cred = get_current_cred();
+}
+
+static void update_peercred(struct sock *sk)
{
const struct cred *old_cred;
struct pid *old_pid;
@@ -740,8 +746,7 @@ static void init_peercred(struct sock *sk)
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();
+ init_peercred(sk);
spin_unlock(&sk->sk_peer_lock);
put_pid(old_pid);
@@ -793,7 +798,7 @@ static int unix_listen(struct socket *sock, int backlog)
WRITE_ONCE(sk->sk_state, TCP_LISTEN);
/* set credentials so connect can copy them */
- init_peercred(sk);
+ update_peercred(sk);
err = 0;
out_unlock:
init_peercred() is called in 3 places: 1. socketpair() : both sockets 2. connect() : child socket 3. listen() : listening socket The first two need not hold sk_peer_lock because no one can touch the socket. Let's set cred/pid without holding lock for the two cases and rename the old init_peercred() to update_peercred() to properly reflect the use case. Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> --- net/unix/af_unix.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)