VSOCK: bind to random port for VMADDR_PORT_ANY

The old code always starts from fixed port for VMADDR_PORT_ANY. Sometimes
when VMM crashed, there is still orphaned vsock which is waiting for
close timer, then it could cause connection time out for new started VM
if they are trying to connect to same port with same guest cid since the
new packets could hit that orphaned vsock. We could also fix this by doing
more in vhost_vsock_reset_orphans, but any way, it should be better to start
from a random local port instead of a fixed one.
Signed-off-by: Lepton Wu <ytht.net@gmail.com>
Reviewed-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/vmw_vsock/af_vsock.c

@@ -107,6 +107,7 @@
 #include <linux/mutex.h>
 #include <linux/net.h>
 #include <linux/poll.h>
+#include <linux/random.h>
 #include <linux/skbuff.h>
 #include <linux/smp.h>
 #include <linux/socket.h>
@@ -504,9 +505,13 @@ static void vsock_pending_work(struct work_struct *work)
 static int __vsock_bind_stream(struct vsock_sock *vsk,
 			       struct sockaddr_vm *addr)
 {
-	static u32 port = LAST_RESERVED_PORT + 1;
+	static u32 port = 0;
 	struct sockaddr_vm new_addr;
 
+	if (!port)
+		port = LAST_RESERVED_PORT + 1 +
+			prandom_u32_max(U32_MAX - LAST_RESERVED_PORT);
+
 	vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
 
 	if (addr->svm_port == VMADDR_PORT_ANY) {