Luciano Porto Barreto

Evaluation of interrupt handling timeliness in real-time Linux operating systems

Several real-time Linux extensions are available nowadays. Two of those extensions that have received special attention recently are Preempt-RT and Xenomai. This paper evaluates to what extent they provide deterministic guarantees when reacting to external events, an essential characteristic when it comes to real-time systems. For this, we define two simple experimental approaches. Our results indicate that Preempt-RT is more prone to temporal variations than Xenomai when the system is subject to overload scenarios.

Improving location privacy in mix-zones for VANETs

Providing location privacy to users is one of the important issues that must be addressed in Vehicular Ad-Hoc Networks. Recent solutions address it by using cryptographic “mix-zones”, which are anonymizing regions where nodes change their temporary identities (pseudonym) without being tracked. However, existing solutions are vulnerable to internal attackers since within a mix-zone messages are encrypted using a group secret key. In this paper we improve location privacy of mix-zones via extensions to the CMIX protocol. By carrying out extensive simulations, we investigate and compare the effective location privacy provided by the proposed approach.

Abstract specification and formalization of an operating system kernel in Z

One of the mini challenges in software verification related to the Grand Challenge proposed by Tony Hoare concerns the formal specification and verification of an operating system kernel. This paper proposes a simple and correct specification of an OS kernel in Z which simplifies the understanding and verification of operating system components. Our current specification comprises process management, interprocess communication and a POSIX-compliant file system.

VII Brazilian workshop on operating systems

This paper reports on the VII Brazilian Workshop on Operating Systems.