Re: Deadly Libs
On 08.05.2007 14:36, Volker Raum wrote:
Hi everyone,
i would like to hear some thoughts about a problem i stumbled upon while
thinking about writing a modulebased software.
Following situation:
I got a main functionality coded in a Java program. (JSE or JEE doesnt
matter, i think)
To extend this functionality i will give 3rd parties the opportunity to
develop extensions.
Those are called from the main program via a methodcall within the same
virtual machine.
Maybe the 3rd party did a mistake or simply coded malware like
public void aMethod()
{
while(true) {
}
}
Calling this method will cause a severe CPU Utilisation problem.
The simple question is: how do i avoid this?
Simple answer: you don't.
In practice though this is a rarely if ever seen scenario. You'd simply
stop using such a library, wouldn't you?
An extra thread will not help i think, because the method still causes
CPU utilisation.
And what do i do with such a "never ending" thread? i cant kill it from
"extern" after started.
So, any thoughts?
You are worrying too much - unless you want to create a system that
should download arbitrary code from /somewhere/ and be robust against
bugs and malicious attacks. But then you also need to address a lot of
other issues (preventing disk accesses etc.) and you probably want to
look into Java's security model.
Kind regards
robert
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