Thread: Security Engineering; Simple Question

  1. #1
    Registered User
    Join Date
    May 2020

    Question Security Engineering; Simple Question

    Hey, guys,

    I am absolutely new to C programming. Currently I am preparing for my new course of studies IT Security. In a slightly older exam I found a task where I have no approach how to solve it. The task is in German. In principle it is about finding critical errors.
    It is not written how the passed parameters look like. I have come to the point that you should not use strcpy() because it has no bounds checking. Also char[10] should not be used if you want to store 10 characters (\0). Can someone help me a little bit? I would like to mention again that you help me here personally and do not help to collect bonus points in the university.

    Security Engineering; Simple Question-it_sec_klausur01_2017-png

    Thank you !

  2. #2
    Registered User
    Join Date
    Apr 2019
    Can you use `strncpy`?

    And why are you doing math on a string?

  3. #3
    Registered User
    Join Date
    Feb 2019
    Problems with this code:
    1. your buffer (code) has obly 10 chars (as you notice) and 11 bytes are being copied;
    2 '9' (value: 57) is not the same thing as 9;
    3. argv[1] could have less then 10 chars

    I don't know german, so I cannot know what is being asked.

  4. #4
    Registered User
    Join Date
    May 2009
    Using literal constants instead of defines is also a problem.
    Magic number (programming) - Wikipedia

    Tim S.
    "...a computer is a stupid machine with the ability to do incredibly smart things, while computer programmers are smart people with the ability to do incredibly stupid things. They are,in short, a perfect match.." Bill Bryson

  5. #5
    Registered User
    Join Date
    Feb 2019
    Another one: printf() should have the format string in line 5, as in:
      printf( "%s", argv[1] );

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