https://tsecurity.de/de/1155495/IT+Reverse+Engineering/Sicherheitsl%C3%BCcken/Google+Android+7.0%2F7.1.1%2F7.1.2%2F8.0%2F8.1+Permission+Check+DevicePolicyManagerService.java+GetPermittedAccessibilityServicesForUser+privilege+escalation/