Thomas Ribbrock wrote :
>
> But isn't there a DoS hole under Linux anyway? IIRC anybody who is
> able to use all available memory (incl. swap) can bring the system down,
> as the kernel will start to randomly shut down processes. That was true
> for 2.0.x at least, I don't know whether that was fixed in the later
> 2.2.x or 2.3.x series - there was a lot of talk about it on the kernel
> list once...
> If I'm completely off target here, would someone please correct me? :-}
You're absolutely correct.
Linux overcommits memory since processes generally claim more than
they need. When memory becomes short (which rarely happens), Linux
has to kill processes to get memory back.
There's an article about it in this week's Linux Weekly News
(Kernel section, of course): http://www.lwn.net/2000/1012/kernel.php3
Emmanuel Seyman
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