Re: High Resolution Timer DOS

[William Heimbigner]

On Sat, 28 Apr 2007, Lee Revell wrote:

> On 4/28/07, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> >  Well, it is not really a DoS. The rescheduling of the process is limited
> >  by the scheduler and the available CPU time (depending on the number of
> >  runnable tasks in the system).
>
> Shouldn't an unprivileged process be rate limited somehow to avoid
> flooding the machine with interrupts?  We restrict nonroot users from
> setting the RTC interrupt rate higher than 64Hz for a similar reason
> (granted, this limit dates back to the 486 days and should probably be
> increased to 1024 Hz).

Isn't that what /etc/security/limits.conf is for?
Just limit the CPU usage.

> Root and SCHED_FIFO tasks could be exempt from rate limiting, to avoid
> the need to introduce a new rlimit which would take years for
> userspace to catch up to.
>
> Lee

William Heimbigner
icxcnika@xxxxxxxxxx
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