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

Abstract

The invention discloses a method for capturing functions that cause memory to be rewritten by wild pointers, comprising the following steps: adding a function call and return hook function in the system, and configuring a global function pointer; when the system is running, in the function call hook function Record the value of the monitored memory. In the function return hook function, compare the memory value recorded by the function call hook function with the current memory value. If they are inconsistent, record the address of the currently running function to the global in the function pointer. Further, when the task is switched, the global function pointer is assigned as the address of the recorded function pointer in the memory area corresponding to the switched-in task. By applying the capture method of the present invention, the function that causes the memory to be rewritten by the wild pointer can be captured and recorded in real time, and furthermore, the task that calls the function can also be located.

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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