PATENT CLAIM ANALYSIS

Application Number: 15949312
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2018-08
Patent Classification: ["711", "207000"]

Abstract:
A system is described to provide protection key access control in a system whose operating system and processor were not designed to provide a protection key memory access control mechanism. Such a system can be applied to an emulator or to enable a system that executes native applications to be interoperable with a legacy system that employs protection key memory access control.

Claim (Index 1):
A method of implementing protection key memory access control in a computing system having a processor not adapted to support protection key memory access control, the processor including a memory management unit (MMU) and executing an operating system that manages virtual memory, the processor adapted to execute user processes comprising tasks, the method comprising:\n assigning a contiguous range of addressable virtual memory containing blocks to each user process; assigning a storage access key to each task; initiating execution of a specific task in a specific user process using the storage access key assigned to that specific task by assigning a first virtual address mapping in the contiguous range of addressable virtual memory to that specific task with its assigned storage access key; determining whether the specific task is authorized to use a different storage access key, and if the specific task is authorized, assigning a subsequent virtual address mapping to the specific task and the different storage access key; setting control bytes including setting storage key data and an indicator that a page comprising data associated with each control byte is valid; and upon execution of a computer instruction of the specific task using any storage access key,\n generating a virtual address associated with the specific task; \n determining whether the virtual address associated with the specific task lies within the contiguous range of virtual address memory; and \n if the address lies within the contiguous range of addressable virtual memory:\n generating by the MMU a segmentation fault; \n verifying that said storage access key has a value of zero or that said task is authorized to access the virtual address using that said storage access key; \n upon said verifying, changing native protection settings associated with the page stored in the virtual memory and associated with the task to allow access to the associated virtual address; and \n subsequently re-executing the computer instruction of the specific task to allow access to the page.

Metadata:
- Claim Count in Document: 50.0
- Percentile: 91.0
- Lexical Diversity: 1.68421
- Patent Class: 711.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15691874', '15162288', '10244559', '11972725', '13085873']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.4833245646497852
- 35 USC 102 Novelty (BERT): 0.5675448420723986
- Combined Prediction Score: 0.4917465923920465
- Mean Citation Score: 278.246414
- Max Citation Score: 432.72794000000016
- Similarity Product: 427.187845317762

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test