Configurable toolset for static verification of operating systems kernel modules
An operating system (OS) kernel is a critical software regarding to reliability and efficiency. Quality of modern OS kernels is already high enough. However, this is not the case for kernel modules, like, for example, device drivers that, due to various reasons, have a significantly lower level of quality. One of the most critical and widespread bugs in kernel modules are violations of rules for correct usage of a kernel API. One can find all such violations in modules or can prove their correctness using static verification tools that need contract specifications describing obligations of a kernel and modules relative to each other. This paper considers present methods and toolsets for static verification of kernel modules for different OSs. A new method for static verification of Linux kernel modules is proposed. This method allows one to configure the verification process at all its stages. It is shown how it can be adapted for checking kernel components of other OSs. An architecture of a configurable toolset for static verification of Linux kernel modules that implements the proposed method is described, and results of its practical application are presented. Directions for further development of the proposed method are discussed in conclusion.
This book constitutes the refereed proceedings of the 10th International Andrei Ershov Informatics Conference, PSI 2015, held in Kazan and Innopolis, Russia, in August 2015. The 2 invited and 23 full papers presented in this volume were carefully reviewed and selected from 56 submissions. The papers cover various topics related to the foundations of program and system development and analysis, programming methodology and software engineering and information technologies.
The correctness of embedded systems software is of critical importance as invalid states can cause a physical damage to hardware. One of approaches to verification of such systems is using source code analyzers. The Static Driver Verifier Research Platform (SDVRP), which is based on Simultaneous Localization and Mapping (SLAM) and represents a tool that systematically analyzes source code and allows writing custom Specification Language for Interface Checking (SLIC) rules for various platforms, provided a potent verification mechanism for a thermal printer software system based on ARM Cortex-M0 microprocessor. An example of creating a custom platform plugin and rule verification is provided for the given embedded system.
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
The geographic information system (GIS) is based on the first and only Russian Imperial Census of 1897 and the First All-Union Census of the Soviet Union of 1926. The GIS features vector data (shapefiles) of allprovinces of the two states. For the 1897 census, there is information about linguistic, religious, and social estate groups. The part based on the 1926 census features nationality. Both shapefiles include information on gender, rural and urban population. The GIS allows for producing any necessary maps for individual studies of the period which require the administrative boundaries and demographic information.
Existing approaches suggest that IT strategy should be a reflection of business strategy. However, actually organisations do not often follow business strategy even if it is formally declared. In these conditions, IT strategy can be viewed not as a plan, but as an organisational shared view on the role of information systems. This approach generally reflects only a top-down perspective of IT strategy. So, it can be supplemented by a strategic behaviour pattern (i.e., more or less standard response to a changes that is formed as result of previous experience) to implement bottom-up approach. Two components that can help to establish effective reaction regarding new initiatives in IT are proposed here: model of IT-related decision making, and efficiency measurement metric to estimate maturity of business processes and appropriate IT. Usage of proposed tools is demonstrated in practical cases.