calc — pwnable.tw

###phân tích rõ các hàm trong challenge

The function ssignal() defines the action to take when the software  signal  with  number  signum  is raised  using  the  function gsignal(), and returns the previous such action or SIG_DFL.
The  bzero()  function sets the first n bytes of the area starting at s to zero (bytes containing '\0').

###SUM UP

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