Messages in this thread |  | | Date | Thu, 16 Nov 2000 13:51:01 -0200 (BRDT) | From | Rik van Riel <> | Subject | RE: KPATCH] Reserve VM for root (was: Re: Looking for better VM) |
| |
On Thu, 16 Nov 2000, Szabolcs Szakacsits wrote:
[snip exploit that really shouldn't take Linux down]
> This or something similar didn't kill the box [I've tried all local > DoS from Packetstorm that I could find]. Please send a working > example. Of course probably it's possible to trigger root owned > processes to eat memory eagerly by user apps but that's a problem in > the process design running as root and not a kernel issue.
Not necessarily, but your patch will probably make a difference for quite a number of people...
> If you think fork() kills the box then ulimit the maximum number > of user processes (ulimit -u). This is a different issue and a > bad design in the scheduler (see e.g. Tru64 for a better one).
My fair scheduler catches this one just fine. It hasn't been integrated in the kernel yet, but both VA Linux and Conectiva use it in their kernel RPM.
> BTW, I have a new version of the patch with that Linux behaves > much better from root's point of view when the memory is more > significantly overcommited. I'll post it if I have time [and > there is interest].
There is interest, believe me ;)
While this is not one of the sexy new kernel features, this will help quite a few system administrators and is destined to a long and healthy life inside kernel RPMs, maybe even in the main kernel tree (when 2.5 splits?).
regards,
Rik -- "What you're running that piece of shit Gnome?!?!" -- Miguel de Icaza, UKUUG 2000
http://www.conectiva.com/ http://www.surriel.com/
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |