Re: [PATCH] [request for inclusion] Realtime LSM

Arjan van de Ven
2005-01-13T07:30:08Z

On Wed, Jan 12, 2005 at 06:44:23PM -0600, Jack O'Quin wrote:
> Arjan van de Ven <arjanv@redhat.com> writes:
>
> > On Tue, Jan 11, 2005 at 07:43:29PM -0600, Jack O'Quin wrote:
> >> Lexicographic ambiguity: Lee and Paul are using "trash" for things
> >> like installing a hidden suid root shell or co-opting sendmail into an
> >> open spam relay. Arjan just means crashing the system which forces
> >> reboot to run fsck.
> >
> > I actually meant data corruption.
>
> Are you concerned about something different from the "normal" risk of
> data corruption when the kernel panics or someone trips over the power
> cord?

yes; the "normal" risk is time limited, eg the kernel will wait at most 30
seconds before writing back your dirty data, 5 seconds for ext3 actually.
With the "RT-abuse" hang, this 30 second thing goes on hold (because it's
done from those kernel threads that cause you those hickups in sound :-) and
you can starve a far longer period of time.. which may well mean a far
larger dataset not hitting the disk.