Re: reiserfs one user DoS?

Erik Tews
2003-10-06T00:00:37Z

On Sun, Oct 05, 2003 at 06:09:24PM +0200, Christian Kujau wrote:
> Hans Reiser schrieb:
> >>I have found such strange thing:
> >>
> >>pseudo@avalon at 14:04:00 ~> dd if=/dev/zero of=file bs=1 count=0
> >>seek=1000000000000
> >>
> >>After that my Intel Celeron 800 MHz/384M RAM 60G/Seagate U6 under
> >>Linux-2.4.22-grsec on reiserfs was utilized 100% for more than 2 hours.
> >>dd process can't be killed.
> >>
> >>Is this my flow or real bug?
> >>
> >it is fixed in reiser4. linux has a lot of DOS vulerabilities to logged
> >in users, mostly due to the ability to consume all of some resource or
> >another. forgive me for not discussing them publicly.;-)
>
> perhaps "ulimit" could help here.

Really? If I got a process which is unkillable, how can the kernel kill
this process if it runs out of cpu-time?