Access permissions modification
US9852084B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2016 |
| Grant date | Dec 26, 2017 |
| Priority date | — |
| Expiry date | Mar 5, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/1052
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Systems, apparatuses, and methods for modifying access permissions in a processor. A processor may include one or more permissions registers for managing access permissions. A first permissions register may be utilized to override access permissions embedded in the page table data. A plurality of bits from the page table data may be utilized as an index into the first permissions register for the current privilege level. An attribute field may be retrieved from the first permissions register to determine the access permissions for a given memory request. A second permissions register may also be utilized to set the upper and lower boundary of a region in physical memory where the kernel is allowed to execute. A lock register may prevent any changes from being made to the second permissions register after the second permissions register has been initially programmed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.