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Most modern operating systems implement some sort of memory protection scheme for user processes. These schemes make it is possible to set access permissions that determine whether a region of memory allocated for a process can be read, written, or executed by this process. Mondrian memory protection is a technique that extends the traditional memory protection scheme and allows fine-grain permission settings. Instead of being able to set access permissions on a page-level, Mondrian memory protection supports different access permissions for individual words. However, this protection scheme is still limited to only two permission bits that have a predefined semantics. This is not sufficient to implement more complex security techniques, for example, a race condition detection system.
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