kcm: close race conditions on sk_receive_queue

sk->sk_receive_queue is protected by skb queue lock, but for KCM
sockets its RX path takes mux->rx_lock to protect more than just
skb queue. However, kcm_recvmsg() still only grabs the skb queue
lock, so race conditions still exist.

We can teach kcm_recvmsg() to grab mux->rx_lock too but this would
introduce a potential performance regression as struct kcm_mux can
be shared by multiple KCM sockets.

So we have to enforce skb queue lock in requeue_rx_msgs() and handle
skb peek case carefully in kcm_wait_data(). Fortunately,
skb_recv_datagram() already handles it nicely and is widely used by
other sockets, we can just switch to skb_recv_datagram() after
getting rid of the unnecessary sock lock in kcm_recvmsg() and
kcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,
so it is safe to get rid of this check too.

I ran the original syzbot reproducer for 30 min without seeing any
issue.

Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module")
Reported-by: syzbot+278279efdd2730dd14bf@syzkaller.appspotmail.com
Reported-by: shaozhengchao <shaozhengchao@huawei.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/r/20221114005119.597905-1-xiyou.wangcong@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index a500422..890a242 100644 (file)
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -222,7 +222,7 @@ static void requeue_rx_msgs(struct kcm_mux *mux, struct sk_buff_head *head)
        struct sk_buff *skb;
        struct kcm_sock *kcm;
 
-       while ((skb = __skb_dequeue(head))) {
+       while ((skb = skb_dequeue(head))) {
                /* Reset destructor to avoid calling kcm_rcv_ready */
                skb->destructor = sock_rfree;
                skb_orphan(skb);
@@ -1085,53 +1085,17 @@ out_error:
        return err;
 }
 
-static struct sk_buff *kcm_wait_data(struct sock *sk, int flags,
-                                    long timeo, int *err)
-{
-       struct sk_buff *skb;
-
-       while (!(skb = skb_peek(&sk->sk_receive_queue))) {
-               if (sk->sk_err) {
-                       *err = sock_error(sk);
-                       return NULL;
-               }
-
-               if (sock_flag(sk, SOCK_DONE))
-                       return NULL;
-
-               if ((flags & MSG_DONTWAIT) || !timeo) {
-                       *err = -EAGAIN;
-                       return NULL;
-               }
-
-               sk_wait_data(sk, &timeo, NULL);
-
-               /* Handle signals */
-               if (signal_pending(current)) {
-                       *err = sock_intr_errno(timeo);
-                       return NULL;
-               }
-       }
-
-       return skb;
-}
-
 static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
                       size_t len, int flags)
 {
        struct sock *sk = sock->sk;
        struct kcm_sock *kcm = kcm_sk(sk);
        int err = 0;
-       long timeo;
        struct strp_msg *stm;
        int copied = 0;
        struct sk_buff *skb;
 
-       timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
-
-       lock_sock(sk);
-
-       skb = kcm_wait_data(sk, flags, timeo, &err);
+       skb = skb_recv_datagram(sk, flags, &err);
        if (!skb)
                goto out;
 
@@ -1162,14 +1126,11 @@ msg_finished:
                        /* Finished with message */
                        msg->msg_flags |= MSG_EOR;
                        KCM_STATS_INCR(kcm->stats.rx_msgs);
-                       skb_unlink(skb, &sk->sk_receive_queue);
-                       kfree_skb(skb);
                }
        }
 
 out:
-       release_sock(sk);
-
+       skb_free_datagram(sk, skb);
        return copied ? : err;
 }
 
@@ -1179,7 +1140,6 @@ static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
 {
        struct sock *sk = sock->sk;
        struct kcm_sock *kcm = kcm_sk(sk);
-       long timeo;
        struct strp_msg *stm;
        int err = 0;
        ssize_t copied;
@@ -1187,11 +1147,7 @@ static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
 
        /* Only support splice for SOCKSEQPACKET */
 
-       timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
-
-       lock_sock(sk);
-
-       skb = kcm_wait_data(sk, flags, timeo, &err);
+       skb = skb_recv_datagram(sk, flags, &err);
        if (!skb)
                goto err_out;
 
@@ -1219,13 +1175,11 @@ static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
         * finish reading the message.
         */
 
-       release_sock(sk);
-
+       skb_free_datagram(sk, skb);
        return copied;
 
 err_out:
-       release_sock(sk);
-
+       skb_free_datagram(sk, skb);
        return err;
 }