Consider a contains () function normal users of MIPS assembly language program read input from MIPS input address, () function to normal users input the 8-bit ASCII characters are divided into four groups (32 digits), then these 32-bit Numbers onto the stack, then the average user () in the number from the stack pop-up before the first call a bunch of other functions, and there is another function in the program is called the secure admin (), it performs a very important thing, never completed by using the function of the user, the ordinary user, anywhere in the code have no function call secure admin () for the average user (), the user how to use this vulnerability was catnip to this admin function run