Système hérité

Un système hérité, système patrimonial ou système obsolète (en anglais : legacy system) est un matériel ou un logiciel continuant d'être utilisé dans une organisation (entreprise ou administration), alors qu'il est supplanté par des systèmes plus modernes. L'obsolescence de ces systèmes et leur criticité les rendent difficilement remplaçables sans engendrer des projets coûteux et risqués. Par exemple, les banques et assurances qui ont informatisé leur traitement des informations dans les années 1970 ont des applications qui tournent avec du code hérité souvent en COBOL ou en Fortran. Les risques pris pour réécrire l'application dans un autre langage et les coûts inhérents au changement dissuadent souvent la modernisation du système, voire son remplacement. Causes Les entreprises peuvent avoir des raisons sérieuses de conserver un système hérité, par exemple :

Le système fonctionne de manière satisfaisante, et son propriétaire décide de n

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Microsoft Windows

(littéralement « Fenêtres » en anglais) est au départ une interface graphique unifiée produite par Microsoft, qui est devenue ensuite une gamme de systèmes d’exploitation à part entière, principalem

MS-DOS

MS-DOS (abréviation de Microsoft Disk Operating System) est le système d'exploitation de type DOS développé par Microsoft pour l'IBM PC d'abord, puis les compatibles PC. Il s'agit d'un système fonctio

File format

A file format is a standard way that information is encoded for storage in a . It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprieta

CS-322: Introduction to database systems

This course provides a deep understanding of the concepts behind data management systems. It covers fundamental data management topics such as system architecture, data models, query processing and optimization, database design, storage organization, and transaction management.

CS-430: Intelligent agents

Software agents are widely used to control physical, economic and financial processes. The course presents practical methods for implementing software agents and multi-agent systems, supported by programming exercises, and the theoretical underpinnings including computational game theory.

Reverse engineering of legacy systems

EPFL1996

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PoLPer: Process-Aware Restriction of Over-Privileged Setuid Calls in Legacy Applications

Mathias Josef Payer, Zhenyu Wu

setuid system calls enable critical functions such as user authentications and modular privileged components. Such operations must only be executed after careful validation. However, current systems do not perform rigorous checks, allowing exploitation of privileges through memory corruption vulnerabilities in privileged programs. As a solution, understanding which setuid system calls can be invoked in what context of a process allows precise enforcement of least privileges. We propose a novel comprehensive method to systematically extract and enforce least privilege of setuid system calls to prevent misuse. Our approach learns the required process contexts of setuid system calls along multiple dimensions: process hierarchy, call stack, and parameter in a process-aware way. Every setuid system call is then restricted to the per-process context by our kernel-level context enforcer. Previous approaches without process-awareness are too coarse-grained to control setuid system calls, resulting in over-privilege. Our method reduces available privileges even for identical code depending on whether it is run by a parent or a child process. We present our prototype called PoLPer which systematically discovers only required setuid system calls and effectively prevents real-world exploits targeting vulnerabilities of the setuid family of system calls in popular desktop and server software at near zero overhead.

ASSOC COMPUTING MACHINERY2019

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Towards the next generation of intelligent building: An assessment study of current automation and future IoT based systems with a proposal for transitional design

Nastaran Asadi Zanjani, Gilbert Didier Francis Conus, Maher Kayal, Georgios Lilis

The intelligent building, a major smart city research and development domain, has grown beyond the scope of automation, currently focusing on the occupant centered approaches and the ancillary services offered to the power grid. The Internet of Things (IoT) introduced in the recent years are enabling those prospects. However, due to numerous legacy automation systems already in the construction market, the IoT based intelligent building approach is frequently challenged. This paper assesses the opportunities along with the criticism for a fully IoT enabled and controllable intelligent building against the well established, legacy automation systems in a fair and transparent approach. In the second part, it proposes an interoperable intelligent building design for the creation of advanced building managements schemes, by integrating the assets of current automation tools and the emerging innovations. This unification and the progressive phasing out of legacy technologies, would catalyze the market of intelligent buildings in the context of smart cities by not limiting their potential solely on new constructions and by mitigating the investment if legacy systems are already installed. (C) 2016 Elsevier Ltd. All rights reserved.

Elsevier Science Bv2017

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