buffer overflow是怎么回事？

buffer overflow
缓冲区溢出
缓冲区溢出是一种在各种操作系统、应用软件中广泛存在普遍且危险的漏洞，利用缓冲区溢出攻击可以导致程序运行失败、系统崩溃等后果。更为严重的是，可以利用它执行非授权指令，甚至可以取得系统特权，进而进行各种非法操作。第一个缓冲区溢出攻击--Morris蠕虫，发生在十几年前，它曾造成了全世界6000多台网络服务器瘫痪。
例句:
An input buffer overflow has occurred.
发生输入缓冲区溢出。
This column gives an overview of the buffer overflow problem.
本专栏概述了缓冲区溢位问题。
The vast majority of remote attacks are carried out by exploiting bufferoverflow, the particular case of which is stack overflow.
大多数远程攻击是利用缓冲区溢出技术进行的，特别是栈溢出。
After all, someone could have changed the bytecode manually with a hex editorto attempt to trigger a buffer overflow.
毕竟，也许有人已经用十六进制编辑器手工修改了字节符，试图触发缓冲器溢出。
The Attack of Buffer Overflow and Its Solution
缓冲区溢出攻击及解决方案
A fix for a buffer overflow problem in dhcpd(8).
修复了dhcpd（8）中的缓冲区溢出问题。
So can you use the standard C library's routines for preventing bufferoverflow?
那么可以使用标准C库的例程来防止缓冲区溢出吗？
Research on Trojan Horse Based on Buffer Over