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Descriptors can control areas of memory of any size. A process without a descriptor for an area cannot access it. If sharing is required, several processes can have a descriptor with the same addresses but with different access rights.
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The Plessey 250 [Ham73], Multics [Gra68], IBM S/38, IBM S/6000, Intel X86 [Chi84], and Intel Pentium use some type of descriptors for memory access control. The operating systems in these machines must use this approach for memory management. Specific uses include the Choices operating system [Rus89] and AIX [Cam90].
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The following benefits may be expected from applying this pattern:
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The pattern provides the required segment protection, because a process cannot access a segment without a descriptor for it. Two processes with descriptors with the same memory address base limit pair1 can conveniently share a segment. The pattern applies to any type of virtual address space: single, segregated, or split. If all resources are mapped to the virtual address space, the pattern can control access to any type of resource, including files.
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This relates to a simple method of enforcing memory protection by adding two registers to the CPU, a base address and a size limit, which together demarcate a range of memory to which valid references can be made. References outside that range trigger a memory exception. This works well as long as all memory is allocated contiguously, but non-contiguous memory is harder to protect, as is sharing memory between more than two processes.
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The following potential liabilities may arise from applying this pattern:
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Segmentation makes storage allocation inefficient because of external fragmentation [Sil03]. In most systems segments are paged for convenient allocation. Hardware support is needed, which puts an extra requirement on this solution. In systems that use multiple separate address spaces, it is necessary to add an extra identifier to the descriptor registers to indicate the address space number.
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This pattern is a direct application of AUTHORIZATION (245) to the processes address space.
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Unauthorized processes could destroy or modify information in files or databases, with obvious results, or could interfere with the execution of other processes. Therefore, define an execution environment for processes, indicating explicitly all the resources that a process can use during its execution, as well as the type of access to the resources.
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In our operating system we know now how to assign access rights to processes and how to enforce these rights at execution time. However, a process may have different functions and in each functional mode it may need different rights. For example, if a process needs to read some files to collect some data, this should happen only at the specific time of access to the file, otherwise a hacker could take advantage of the extra rights to perform illegal accesses.
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A process executes on behalf of a user, group, or role (a subject). A process must have access rights to use the resources defined for its subject during execution. The set of access rights given to a process define its execution domain. At times the process may also need to enter other domains to perform its work: for example, for example, to extract data from a file in another user s domain. Frequently, users structure their domains as a hierarchical tree of domains with one root domain.
Restricting a process to a specific set of resources is a basic step towards controlling malicious behavior. Otherwise, unauthorized processes could destroy or modify information in files or databases, with obvious results, or could interfere with the execution of other processes. The solution to this problem must resolve the following forces:
There is a need to restrict the actions of a process during its execution; otherwise it could perform illegal actions. Resources typically include memory and I/O devices, but can also be system data structures and special instructions. Although resources are heterogeneous, we want to treat them uniformly.