From: Michal Luczaj mhal@rbox.co
commit 135ffc7becc82cfb84936ae133da7969220b43b2 upstream.
vsock defines a BPF callback to be invoked when close() is called. However, this callback is never actually executed. As a result, a closed vsock socket is not automatically removed from the sockmap/sockhash.
Introduce a dummy vsock_close() and make vsock_release() call proto::close.
Note: changes in __vsock_release() look messy, but it's only due to indent level reduction and variables xmas tree reorder.
Fixes: 634f1a7110b4 ("vsock: support sockmap") Signed-off-by: Michal Luczaj mhal@rbox.co Reviewed-by: Stefano Garzarella sgarzare@redhat.com Reviewed-by: Luigi Leonardi leonardi@redhat.com Link: https://lore.kernel.org/r/20241118-vsock-bpf-poll-close-v1-3-f1b9669cacdc@rb... Signed-off-by: Alexei Starovoitov ast@kernel.org Acked-by: John Fastabend john.fastabend@gmail.com [LL: There is no sockmap support for this kernel version. This patch has been backported because it helps reduce conflicts on future backports] Signed-off-by: Luigi Leonardi leonardi@redhat.com --- net/vmw_vsock/af_vsock.c | 67 +++++++++++++++++++++++++++++------------------- 1 file changed, 40 insertions(+), 27 deletions(-)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 53a9c0a73489bad5d4d9de1d0299b7b850462204..f80b28934c4b5af11765074da8d3f6f3d92ce6ff 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -113,12 +113,14 @@ static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); static void vsock_sk_destruct(struct sock *sk); static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); +static void vsock_close(struct sock *sk, long timeout);
/* Protocol family. */ static struct proto vsock_proto = { .name = "AF_VSOCK", .owner = THIS_MODULE, .obj_size = sizeof(struct vsock_sock), + .close = vsock_close, };
/* The default peer timeout indicates how long we will wait for a peer response @@ -767,39 +769,37 @@ static struct sock *__vsock_create(struct net *net,
static void __vsock_release(struct sock *sk, int level) { - if (sk) { - struct sock *pending; - struct vsock_sock *vsk; - - vsk = vsock_sk(sk); - pending = NULL; /* Compiler warning. */ + struct vsock_sock *vsk; + struct sock *pending;
- /* When "level" is SINGLE_DEPTH_NESTING, use the nested - * version to avoid the warning "possible recursive locking - * detected". When "level" is 0, lock_sock_nested(sk, level) - * is the same as lock_sock(sk). - */ - lock_sock_nested(sk, level); + vsk = vsock_sk(sk); + pending = NULL; /* Compiler warning. */
- if (vsk->transport) - vsk->transport->release(vsk); - else if (sk->sk_type == SOCK_STREAM) - vsock_remove_sock(vsk); + /* When "level" is SINGLE_DEPTH_NESTING, use the nested + * version to avoid the warning "possible recursive locking + * detected". When "level" is 0, lock_sock_nested(sk, level) + * is the same as lock_sock(sk). + */ + lock_sock_nested(sk, level);
- sock_orphan(sk); - sk->sk_shutdown = SHUTDOWN_MASK; + if (vsk->transport) + vsk->transport->release(vsk); + else if (sk->sk_type == SOCK_STREAM) + vsock_remove_sock(vsk);
- skb_queue_purge(&sk->sk_receive_queue); + sock_orphan(sk); + sk->sk_shutdown = SHUTDOWN_MASK;
- /* Clean up any sockets that never were accepted. */ - while ((pending = vsock_dequeue_accept(sk)) != NULL) { - __vsock_release(pending, SINGLE_DEPTH_NESTING); - sock_put(pending); - } + skb_queue_purge(&sk->sk_receive_queue);
- release_sock(sk); - sock_put(sk); + /* Clean up any sockets that never were accepted. */ + while ((pending = vsock_dequeue_accept(sk)) != NULL) { + __vsock_release(pending, SINGLE_DEPTH_NESTING); + sock_put(pending); } + + release_sock(sk); + sock_put(sk); }
static void vsock_sk_destruct(struct sock *sk) @@ -853,9 +853,22 @@ s64 vsock_stream_has_space(struct vsock_sock *vsk) } EXPORT_SYMBOL_GPL(vsock_stream_has_space);
+/* Dummy callback required by sockmap. + * See unconditional call of saved_close() in sock_map_close(). + */ +static void vsock_close(struct sock *sk, long timeout) +{ +} + static int vsock_release(struct socket *sock) { - __vsock_release(sock->sk, 0); + struct sock *sk = sock->sk; + + if (!sk) + return 0; + + sk->sk_prot->close(sk, 0); + __vsock_release(sk, 0); sock->sk = NULL; sock->state = SS_FREE;