指定大小

b - byteh - halfword (16-bit value)w - word (32-bit value)g - giant word (64-bit value)

1. 基本栈溢出

// c语言源码#include <stdio.h>#include <unistd.h>int vuln() { char buf[80]; int r; r = read(0, buf, 400); printf("\nRead %d bytes. buf is %s\n", r, buf); puts("No shell for you :("); return 0;}