超量程信号表示溢出状况，可由最高有效位来确定是下溢还是上溢。
An out-of-range signal indicates an overflow condition, which can be used with the most significant bit to determine low or high overflow.
最后就如何编写通用的缓冲区溢出代码进行了分析和举例，还介绍了一种新的攻击手段，基于信号量的攻击。
Last, i give some examples on how to write exploit programs after finding vulnerabilities. i also introduce a new exploit method : exploit based on software signal.
超量程(otr)信号表示溢出状况，可由最高有效位来确定是下溢还是上溢。
An out-of-range signal (OTR) indicates an overflow condition which can be used with the most significant bit to determine low or high overflow.
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