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- Protection_ring abstract "In computer science, hierarchical protection domains, often called protection rings, are mechanisms to protect data and functionality from faults (by improving fault tolerance) and malicious behaviour (by providing computer security). This approach is diametrically opposite to that of capability-based security.Computer operating systems provide different levels of access to resources. A protection ring is one of two or more hierarchical levels or layers of privilege within the architecture of a computer system. This is generally hardware-enforced by some CPU architectures that provide different CPU modes at the hardware or microcode level. Rings are arranged in a hierarchy from most privileged (most trusted, usually numbered zero) to least privileged (least trusted, usually with the highest ring number). On most operating systems, Ring 0 is the level with the most privileges and interacts most directly with the physical hardware such as the CPU and memory.Special gates between rings are provided to allow an outer ring to access an inner ring's resources in a predefined manner, as opposed to allowing arbitrary usage. Correctly gating access between rings can improve security by preventing programs from one ring or privilege level from misusing resources intended for programs in another. For example, spyware running as a user program in Ring 3 should be prevented from turning on a web camera without informing the user, since hardware access should be a Ring 1 function reserved for device drivers. Programs such as web browsers running in higher numbered rings must request access to the network, a resource restricted to a lower numbered ring.".
- Protection_ring thumbnail Priv_rings.svg?width=300.
- Protection_ring wikiPageExternalLink ring.
- Protection_ring wikiPageExternalLink 99paper_multithread.pdf.
- Protection_ring wikiPageExternalLink 24319202.pdf.
- Protection_ring wikiPageExternalLink minixonxen.skynet.ie.
- Protection_ring wikiPageExternalLink ft_gateway.cfm?id=319161&type=pdf&coll=portal&dl=ACM&CFID=15151515&CFTOKEN=6184618.
- Protection_ring wikiPageExternalLink ngscb.pdf.
- Protection_ring wikiPageExternalLink 2003-xensosp.pdf.
- Protection_ring wikiPageExternalLink 207401567.
- Protection_ring wikiPageExternalLink TR00-02-a4.pdf.
- Protection_ring wikiPageExternalLink protection.html.
- Protection_ring wikiPageID "3446185".
- Protection_ring wikiPageRevisionID "605658712".
- Protection_ring subject Category:Central_processing_unit.
- Protection_ring subject Category:Computer_security_models.
- Protection_ring subject Category:Operating_system_technology.
- Protection_ring comment "In computer science, hierarchical protection domains, often called protection rings, are mechanisms to protect data and functionality from faults (by improving fault tolerance) and malicious behaviour (by providing computer security). This approach is diametrically opposite to that of capability-based security.Computer operating systems provide different levels of access to resources.".
- Protection_ring label "Anillo (seguridad informática)".
- Protection_ring label "Anneau de protection".
- Protection_ring label "Protection ring".
- Protection_ring label "Ring (CPU)".
- Protection_ring label "User mode".
- Protection_ring label "Кольца защиты".
- Protection_ring label "リングプロテクション".
- Protection_ring label "用户态".
- Protection_ring sameAs Privilegovaný_režim.
- Protection_ring sameAs Ring_(CPU).
- Protection_ring sameAs Anillo_(seguridad_informática).
- Protection_ring sameAs Anneau_de_protection.
- Protection_ring sameAs User_mode.
- Protection_ring sameAs リングプロテクション.
- Protection_ring sameAs 링_(컴퓨터_보안).
- Protection_ring sameAs m.09cvyd.
- Protection_ring sameAs Q1198514.
- Protection_ring sameAs Q1198514.
- Protection_ring wasDerivedFrom Protection_ring?oldid=605658712.
- Protection_ring depiction Priv_rings.svg.
- Protection_ring isPrimaryTopicOf Protection_ring.