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B. 无视一个系统呼吁
原标题:Ignoring a system call

我知道,你可以通过使用<ptrace<>/strong>来抓紧一个系统。 但是,我大麻就是无视一种制度。 因此,ptrace有可能把系统电话打进来,看其号码,如果系统号码是必须加以忽略的,ptrace就会阻止系统运行或立即要求系统返回。

问题在于,我们应当利用<斯特隆>普里,使申请忽视特定系统。

问题回答

You can try PTRACE_GETREGS and PTRACE_SETREGS.
If you change eip to be after the system call, and eax to make the return value valid, the call may be skipped.
But I didn t try it, and wouldn t be surprised if it didn t work.





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