A detection method and device for legitimate memory access

Abstract

The invention provides a detection method for legitimate memory access. The method comprises the steps of establishing a cache and performing initialization; calculating a cache total position index according to the size and the address of a to-be-detected memory block; when a program accesses a memory, addressing a hierarchical cache unit according to the cache total position index and judging whether the address information of the memory block can be read from the hierarchical cache unit; if the address information of the memory block can be read from the hierarchical cache unit, judging whether the access of this time requires detection by a pile inserting type memory detection tool according to the range of the memory access of this time; if the address information of the memory block cannot be read from the hierarchical cache unit, judging whether the access of this time is legitimate with the pile inserting type memory detection tool and putting the address information of the memory block into the hierarchical cache unit when it is determined that the access is legitimate. The invention also provides a device for implementing the method. The method and the device can effectively improve the memory access legitimacy detection efficiency and software performance.

Description

technical field [0001] The invention relates to the field of computer programs, in particular to a detection method and device for legal memory access. Background technique [0002] Illegal access to memory, including array overflow and out-of-bounds, illegal pointer operation, release of address information of wrong memory blocks, etc., has always been one of the most prone, harmful and difficult problems in the software development process. [0003] At present, there are mainly two kinds of C / C++ memory access legality detection tools: instrumentation memory detection tools and dynamic binary analysis tools. [0004] The specific method of the instrumented memory detection tool is to insert monitoring function stubs at memory allocation and access points when compiling C / C++ source files, and use the address information of the accessed memory block and the current access range to identify whether the access is legal. [0005] When detecting the memory access of large-scal...

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Problems solved by technology

[0006] As mentioned above, in view of the low detection performance of instrumented memory detection tools and the fact that most of the memory accesses of general software are legal accesses, the main purpose of the present invention is to provide a detection method for legal memory accesses. It aims to effectively solve the technical problem that the existing memory access legality detection technology needs to check the legality through the instrumentation memory detection tool every time the memory is accessed, resulting in low performance

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