What is the cause of linux stack overflow?

In Linux, the reason for stack overflow is that the system stack grows from high address to low address, and data is written in the order of low address to high address, so once the program does not If the number of characters is limited, there is a possibility of data overflowing the current stack. Stack overflow is a type of buffer overflow, which is essentially caused by the data written to the stack exceeding the size of the stack.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

Causes of Linux stack overflow

Overview

Stacks are those allocated by the compiler when needed and automatically cleared when not needed. The storage area of ​​the variable. The variables inside are usually local variables, function parameters, etc.; compared with the heap, the stack is usually very small. Under Linux, you can check the size of the stack through ulimit -s.

The so-called stack overflow is a type of buffer overflow. Essentially, the data written to the stack exceeds the size of the stack, causing the data to be written to other units, often causing unpredictable consequences. The most common one is the program collapse.

Causes of stack overflow

The system stack grows from high address to low address, and data is written in the order of low address to high address. Enter. If the program does not limit the number of input characters, there is a possibility that the data will overflow the current stack frame and overwrite the return address, thereby controlling the execution flow of the program.

The example is as follows

A stack overflow program:

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