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- Q1198514 subject Q10903823.
- Q1198514 subject Q6967968.
- Q1198514 subject Q7163179.
- Q1198514 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.".
- Q1198514 thumbnail Priv_rings.svg?width=300.
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- Q1198514 wikiPageExternalLink 99paper_multithread.pdf.
- Q1198514 wikiPageExternalLink 24319202.pdf.
- Q1198514 wikiPageExternalLink minixonxen.skynet.ie.
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- Q1198514 wikiPageExternalLink ngscb.pdf.
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- Q1198514 wikiPageExternalLink TR00-02-a4.pdf.
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- Q1198514 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.".
- Q1198514 label "Protection ring".
- Q1198514 depiction Priv_rings.svg.