Sorry, never mind. There's an overflow vulnerability in it:
http://www.securityfocus.com/bid/12196/

On April 4, 2005 02:51 am, Robert Connolly wrote:
> Hi. Since linux-2.6.11 I have been unable to reset kernel.random.poolsize,
> either in /proc/sys/kernel/random/poolsize or with /sbin/sysctl -w. I am of
> course root. I get "Operation not permitted" even on boot
> from /etc/sysctl.conf.
>
> Anyway. I'm hoping someone here has maybe more information about this. I
> checked Google and I didn't come up with anything. I'm on 2.6.11.6 now and
> the problem is the same. All of the above used to work in 2.6.10 and
> previous.
>
> robert
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