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Android applications are executed on smartphones equipped with a variety ofresources that must be properly accessed and controlled, otherwise thecorrectness of the executions and the stability of the entire environment mightbe negatively affected. For example, apps must properly acquire, use, andrelease microphones, cameras, and other multimedia devices otherwise thebehavior of the apps that use the same resources might be compromised.Unfortunately, several apps do not use resources correctly, for instance due tofaults and inaccurate design decisions. By interacting with these apps usersmay experience unexpected behaviors, which in turn may cause instability andsporadic failures, especially when resources are accessed. In this paper, wepresent an approach that lets users protect their environment from the appsthat use resources improperly by enforcing the correct usage protocol. This isachieved by using software enforcers that can observe executions and changethem when necessary. For instance, enforcers can detect that a resource hasbeen acquired but not released, and automatically perform the releaseoperation, thus giving the possibility to use that same resource to the otherapps. The main idea is that software libraries, in particular the onescontrolling access to resources, can be augmented with enforcers that can beactivated and deactivated on demand by users to protect their environment fromunwanted app behaviors. We call the software libraries augmented with one ormore enforcers proactive libraries because the activation of the enforcerdecorates the library with proactive behaviors that can guarantee thecorrectness of the execution despite the invocation of the operationsimplemented by the library.

Controlling Interactions with Libraries in Android Apps Through Runtime Enforcement