Mapeamento de aplicações com comunicação a periféricos em redes intra chip com zonas seguras

Abstract

Using multi-processor systems-on-chip (MPSoC) introduces issues regarding application secu- rity and access to peripherals on these platforms. Among the actions to solve security problems are encryption, authentication of peripherals, and creating Opaque Secure Zones (OSZs). With the creation of OSZs and the requirement to access peripherals in the execution of secure ap- plications, some problems arrise, such as of creating an OSZ on a processing element to which a peripheral is connected or the OSZs disposition preventing the access of some processing element to a peripheral, called in this work as peripheral blocking problem, as well as and the problem caused by the alignment of tasks that communicate with peripherals within an OSZ, calledasshadingprobleminthisstudy. Oncesecureexecutionisessentialforsomeapplications, not solving these problems implies a possible crash or failure in the execution of secure appli- cations. Thus, this study aimed to create an algorithm for defining the shape and positioning of OSZs in an MPSoC and to create an algorithm for task mapping in the OSZ so that every peripheral connected to the platform is accessible for any task. Firstly, the necessary tools to run the platform were installed, as well as its setting, studying algorithms used to define OSZ formats and mapping tasks in the OSZ area. A literature review was carried out in to study algorithms and techniques to define the format and positioning of the OSZ, avoiding blocking access to peripherals by any other task present in the MPSoC, after implementing a solution that meets the demand for not blocking access to peripherals. Following the implementation, a validation step of the algorithms occurred, executing a set of test cases of secure applications on the platform and verifying its functioning to evaluate the algorithms for defining and positioning theformatsandmappingtasksregardingthefunctioning,performance,andresourceavailability. The results show the correct execution of the applications taking into account the restrictions of format and positioning of the OSZ and mapping of the tasks of the applications in the function of the position of the peripherals present in the MPSoC. The results shows an increase in the execution time of the OSZ positioning algorithms and task mapping and an eventual increase in the consumption of processing resources in the allocation phase of the applications. Due to the premise that security in the execution of applications is paramount, this increase in time and resource consumption is an acceptable cost since, as in the worst case scenario among the tests performed, the total time of test execution increased 3.51%. The increase in resource consumption is directly related to the number of application tasks with access to peripherals