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    <p>Well, you can use some general security system to ensure safe code execution like <a href="http://wiki.apparmor.net/index.php/Main_Page" rel="nofollow">AppArmor</a> or <a href="http://en.wikipedia.org/wiki/Security-Enhanced_Linux" rel="nofollow">SELinux</a>. It works not only for java, python, etc. applications, but also for bash-scripts, binary executables and so on. Haven't worked at all with SELinux, but this is a simple example of AppArmor security profile which does everything you mentioned except "running more than X seconds" - this can be done by timeout mechanism (I'm a new user, so cannon post a second link here O_o..)</p> <pre><code>#include &lt;tunables/global&gt; /path/to/executable { #include &lt;abstractions/base&gt; # http://linux.die.net/man/2/setrlimit # limit memory (address space) set rlimit as &lt;= 150M, # limit core dump file http://linux.die.net/man/5/core set rlimit core &lt;= 2M, # allow to create files only this size at max set rlimit fsize &lt;= 1M, # limits number of threads (fork bomb won't go! :)) set rlimit nproc &lt;= 10, # program will have access to stuff defined in abstractions/base and # to the file defined below. Nothing else. /path/to/file.txt rw, } </code></pre> <p>What about putting each script in a sandbox - you can create several identical profiles for script1, script2 etc. This is also the way if you want different permissions for different excercises people will solve on your site.</p> <p>And this is an example of using timeout:</p> <pre><code>$sudo apt-get install timeout $timeout 3 ./binary #limits execution of ./binary to 3 seconds </code></pre> <p>I also want to recommend you limit compilation time for compiled proramming languages if you have any. For example, in C++ someone can write a tricky template or </p> <pre><code>#include &lt;/dev/urandom&gt; </code></pre> <p>That will cause cpu-intensive work at compile-time.</p>
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