libceph: use kernel_connect()

Direct calls to ops->connect() can overwrite the address parameter when
used in conjunction with BPF SOCK_ADDR hooks. Recent changes to
kernel_connect() ensure that callers are insulated from such side
effects. This patch wraps the direct call to ops->connect() with
kernel_connect() to prevent unexpected changes to the address passed to
ceph_tcp_connect().

This change was originally part of a larger patch targeting the net tree
addressing all instances of unprotected calls to ops->connect()
throughout the kernel, but this change was split up into several patches
targeting various trees.

Cc: [email protected]
Link: https://lore.kernel.org/netdev/[email protected]/
Link: https://lore.kernel.org/netdev/[email protected]/
Fixes: d74bad4 ("bpf: Hooks for sys_connect")
Signed-off-by: Jordan Rife <[email protected]>
Reviewed-by: Ilya Dryomov <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>

Author: jrife

net/ceph/messenger.c

@@ -459,8 +459,8 @@ int ceph_tcp_connect(struct ceph_connection *con)
 	set_sock_callbacks(sock, con);
 
 	con_sock_state_connecting(con);
-	ret = sock->ops->connect(sock, (struct sockaddr *)&ss, sizeof(ss),
-				 O_NONBLOCK);
+	ret = kernel_connect(sock, (struct sockaddr *)&ss, sizeof(ss),
+			     O_NONBLOCK);
 	if (ret == -EINPROGRESS) {
 		dout("connect %s EINPROGRESS sk_state = %u\n",
 		     ceph_pr_addr(&con->peer_addr),