Deny access to clipboard if no xwayland window is focused

xwayland/selection.c

@@ -238,6 +238,7 @@ static void xwm_handle_selection_request(struct wlr_xwm *xwm,
 		(xcb_selection_request_event_t *) event;
 
 	if (selection_request->selection != xwm->atoms[CLIPBOARD]) {
+		xwm_send_selection_notify(xwm, XCB_ATOM_NONE);
 		return;
 	}
 
@@ -260,6 +261,14 @@ static void xwm_handle_selection_request(struct wlr_xwm *xwm,
 		return;
 	}
 
+	// No xwayland surface focused, deny access to clipboard
+	if (xwm->focus_surface == NULL) {
+		wlr_log(L_DEBUG, "denying read access to clipboard: "
+			"no xwayland surface focused");
+		xwm_send_selection_notify(xwm, XCB_ATOM_NONE);
+		return;
+	}
+
 	if (selection_request->target == xwm->atoms[TARGETS]) {
 		xwm_send_targets(xwm);
 	} else if (selection_request->target == xwm->atoms[TIMESTAMP]) {
@@ -531,6 +540,13 @@ static void xwm_handle_selection_notify(struct wlr_xwm *xwm,
 		return;
 	}
 
+	// No xwayland surface focused, deny access to clipboard
+	if (xwm->focus_surface == NULL) {
+		wlr_log(L_DEBUG, "denying write access to clipboard: "
+			"no xwayland surface focused");
+		return;
+	}
+
 	if (selection_notify->property == XCB_ATOM_NONE) {
 		wlr_log(L_ERROR, "convert selection failed");
 	} else if (selection_notify->target == xwm->atoms[TARGETS]) {