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Code Golf

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    \$\begingroup\$ Sir, if I may interrupt you for a few cycles so I may fini.... \$\endgroup\$
    – Luminous
    Commented Oct 20, 2015 at 12:57
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    \$\begingroup\$ So what if the first instruction of my inserted code is cli, and then I fix the interrupt table, and go on to compute some primes, etc? \$\endgroup\$
    – Nate Eldredge
    Commented Oct 21, 2015 at 16:22
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    \$\begingroup\$ @NateEldredge: the next step is to jail the rest of the code to ring 3 with no trampoline back to ring 0; I'll see if I manage to put together a working example (another possibility would be to scan the whole address space and NOP-out all the cli (and inp and outp just for good measure), but I don't know if that would be allowed by the rules. \$\endgroup\$
    – Matteo Italia
    Commented Oct 21, 2015 at 19:19
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    \$\begingroup\$ At least as it stands, this won't stop a program from writing directly to the screen buffer (which was pretty common under DOS). \$\endgroup\$
    – Jerry Coffin
    Commented Oct 21, 2015 at 20:28
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    \$\begingroup\$ @NateEldredge: the rules aren't really clear on this, and if you look around most answers actually consist in modifications to the environment that generate a runtime error of some type on trivial instructions (the JS clear(this);, the memory limit in PHP, the recursion limit in Python, the sandboxed environment in Python and many others), I wouldn't see this as a problem. \$\endgroup\$
    – Matteo Italia
    Commented Oct 22, 2015 at 5:54