Page table integrity protection method, device and equipment

Abstract

Embodiments of the invention provide a page table integrity protection method, device and equipment. The method comprises the steps of determining a to-be-verified target data item in a page table; starting from the next node layer of the root node of a protection tree, verifying the target node associated with the target data item in each node layer of the protection tree in sequence until the target node directly associated with the target data item in the tail end node layer of the protection tree is verified; and determining the integrity of the target data item based on the verification result of the target node. The MAC of the node of the protection tree for page table integrity protection is calculated based on the data in the node, a local counter directly associated with the nodeand a global counter corresponding to the local counter, so that the protection tree constructed based on the data can have fewer hierarchies, and the calculation amount of page table integrity protection can be reduced.

Description

technical field [0001] The embodiments of the present invention relate to the field of computer technology, and in particular to a page table integrity protection method, device and equipment. Background technique [0002] Memory, also known as internal memory, is used to temporarily store computing data in the processor and exchange data with external storage such as hard drives, and is a bridge for the processor to communicate with the outside world. [0003] For efficient management, physical memory is divided into fixed-size blocks called pages. The physical page size is determined by the hardware, usually a power of 2, for example, on the X86 platform, the physical page size is 4KB. The page table is used to record the mapping relationship between the first address of each block of physical memory and the virtual address. [0004] In order to protect the page table from being tampered with, the integrity protection of the page table is required. For example, an integ...

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Problems solved by technology

[0005] However, in the existing page table protection schemes, in order to ensure the security of the page table data, the calculation amount of the page table integrity protection is too large. Therefore, how to provide an improvement scheme to reduce the page The calculation amount of table integrity protection has become a technical problem that those skilled in the art need to solve urgently

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