Method for capturing function for resulting in memory rewriting by wild pointer

Abstract

The invention discloses a method for capturing a function causing memory to be rewritten by a stray pointer. The method comprises adding a hook function calling function and a hook function returning function in a system and allocating a global function pointer; when the system is running, recording a monitored memory value in the hook function calling function and comparing the recorded memory value by the hook function calling function with the current memory value in the hook function returning function, and in case of inconsistency, recording the address of the currently operating function to the global function pointer; and further, when switching a task, assigning the global function point to the corresponding recorded function pointer address of the switched task in the memory bank. The inventive capturing method can capture and record the function causing memory to be rewritten by the stray pointer in real time and further can locate the take calling the function.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for capturing functions that cause memory to be rewritten by wild pointers. Background technique [0002] In the field of communication, the communication products containing CPU may encounter the abnormal situation of the system function or even crash due to the illegal rewriting of the memory in the market application or laboratory environment. The cause of the above abnormal situation is illegal rewriting, especially the illegal rewriting of memory by wild pointers. After the problem occurs, what you see is only the rewritten memory state. As for which function of which task is rewritten, it is impossible to know, so it is difficult to locate the cause of this problem. [0003] In the field of communication, the problem of rewriting memory by wild pointers is still a difficult problem. At present, there is generally no systematic method to locate the cause of...

AI Technical Summary

Problems solved by technology

[0005] However, due to task switching and function calls, they are very frequent in a real-time system. If the monitoring means occupy too much system resources, the system performance will decrease during monitoring, which will affect the operation of the main functions of the system.

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