IOS

Résumé

iOS (initialement iPhone OS) est un système d'exploitation mobile créé et développé par la société américaine Apple exclusivement pour ses produits. Il gère de nombreux appareils tels que l'iPhone, l'iPod touch et fonctionnait sur les iPad jusqu'en 2019. Il s'agit du deuxième système d'exploitation mobile le plus installé au monde, après Android. Il constitue la base de quatre autres systèmes d'exploitation : iPadOS, tvOS, watchOS et macOS. Il s'agit d'un logiciel propriétaire, bien que certaines parties soient en open source sous la licence Apple Public Source License et d'autres licences. Lancé en 2007 pour l'iPhone de première génération, le logiciel s'est étendu pour prendre en charge d'autres appareils tels que l'iPod Touch et l'iPad. Des versions majeures du système d'exploitation sont dévoilées chaque année. Historique En 2005, lorsque Steve Jobs conçoit l'iPhone, il a le choix entre réduire le Mac, ce qui est un exploit épique en matière d'ingénierie, ou agrandir

Source officielle

https://fr.wikipedia.org/wiki/IOS

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Concepts associés (130)

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Cours associés (30)

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Séances de cours associées (39)

Séances de cours associées

Chargement

Security Vulnerabilities of the Cisco IOS Implementation of the MPLS Transport Profile

Sergio Barreto Andrade, Udaya Upul Kumara Jayasinghe, Jean-Yves Le Boudec, Miroslav Popovic, Teklemariam Tsegay Tesfay

We are interested in the security of the MPLS Transport Profile (MPLS-TP), in the context of smart-grid communication networks. The security guidelines of the MPLS-TP standards are written in a complex and indirect way, which led us to pose as hypothesis that vendor solutions might not implement them satisfactorily. To test this hypothesis, we investigated the Cisco implementation of two MPLS-TP OAM (Operations, Administration, and Maintenance) protocols: bidirectional forwarding detection (BFD), used to detect failures in label-switched paths (LSPs) and protection state coordination (PSC), used to coordinate protection switching. Critical smart grid applications, such as protection and control, rely on the protection switching feature controlled by BFD and PSC. We did find security issues with this implementation. We implemented a testbed with eight nodes that run the MPLS-TP enabled Cisco IOS; we demonstrated that an attacker who has access to only one cable (for two attacks) or two cables (for one attack) is able to harm the network at several points (e.g., disabling both working and protection LSPs). This occurred in spite of us implementing the security guidelines that are available from Cisco for IOS and MPLS-TP. The attacks use forged BFD or PSC messages, which induce a label-edge router (LER) into believing false information about an LSP. In one attack, the LER disables the operational LSP; in another attack, the LER continues to believe that a physically destroyed LSP is up and running; in yet another attack, both operational and backup LSPs are brought down. Our findings suggest that the MPLS-TP standard should be more explicit when it comes to security. For example, to thwart the attacks revealed here, it should mandate either hop by hop authentication (such as MACSec) at every node, or an ad-hoc authentication mechanism for BFD and PSC.

2014

Chargement

, ,

We propose a power-efficient many-core server-on-chip system with 3D-stacked Wide I/O DRAM targeting cloud workloads in datacenters. The integration of 3D-stacked Wide I/O DRAM on top of a logic die increases available memory bandwidth by using dense and fast Through-Silicon Vias (TSVs) instead of off-chip IOs, enabling faster data transfers at much lower energy per bit. We demonstrate a methodology that includes full-system microarchitectural modeling and rapid virtual physical prototyping with emphasis on the thermal analysis. Our findings show that while executing CPU-centric benchmarks (e.g. SPECInt and Dhrystone), the temperature in the server-on-chip (logic+DRAM) is in the range of 175-200C at a power consumption of less than 20W, exceeding the reliable operating bounds without any cooling solutions, even with embedded cores. However, with real cloud workloads, the power density in the server-on-chip remains much below the temperatures reached by the CPU-centric workloads as a result of much lower power burnt by memory-intensive cloud workloads. We show that such a server-on-chip system is feasible with a low-cost passive heat sink eliminating the need for a high-cost active heat sink with an attached fan, creating an opportunity for overall cost and energy savings in datacenters.

2012

Chargement

GPS/INS Integration: From Modern Methods of Data Acquisition fo New Applications

Jan Skaloud

This paper presents a new approach to GPS/INS data acquisition and synchronization for the most popular sensors adopted by the mapping industry for direct-georeferencing; the tactical-grade FOG/silicon-based inertial sensors and generic dual frequency GPS receivers. Contrary to most industry solutions, no dedicated timing boards or industrial PCs with real-time OS kernels are needed. The somewhat inconvenient SDLC communication and synchronization of the 400Hz inertial data is handled by a small interface that is connected to a conventional laptop via Ethernet. This PC performs data storage and/or loosely coupled integration with GPS data coming over RS232 serial link. The laptop can use Windows or other standard Operating Systems (OS) as varying processing latency is no longer critical. The same laptop can also handle voluminous (10 kHz) airborne laser scanning data coming over the same Ethernet port or data arriving from high resolution digital camera (fire-wire). Altogether this small-size, low-weight navigation system opens door to new and affordable mapping applications of high precision.

2004

Chargement

Security Vulnerabilities of the Cisco IOS Implementation of the MPLS Transport Profile

Sergio Barreto Andrade, Udaya Upul Kumara Jayasinghe, Jean-Yves Le Boudec, Miroslav Popovic, Teklemariam Tsegay Tesfay

2014