linux-kernel - Re: Entropy poolsize

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Date:	Sun, 4 Jul 2010 15:00:21 -0400
From:	Weedy <weedy2887@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Entropy poolsize

On Tue, Jun 22, 2010 at 7:21 PM, Weedy <weedy2887@...il.com> wrote:
> Man I need to remember to hit reply-to-all
>
> On Mon, Jun 21, 2010 at 3:56 PM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
>> On 06/21/10 12:48, Weedy wrote:
>>> On Mon, Jun 21, 2010 at 11:51 AM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
>>>> On Mon, 21 Jun 2010 09:58:16 -0400 Weedy wrote:
>>>>
>>>>> I know grsecurity has a option for this but I don't want to patch my
>>>>> kernel with it at this time. I have been poking around random.c but I
>>>>> can't seem to figure out where .poolsize is assigned it's value and
>>>>> how to increase it.
>>>>>
>>>>> If someone could point it out that would be nice.
>>>>>
>>>>> Thank you for your time.
>>>>> --
>>>>
>>>> Do you mean this one in drivers/char/random.c or something else?
>>>>
>>>> static int sysctl_poolsize = INPUT_POOL_WORDS * 32;
>>>>
>>>> It's a sysctl, so it is tunable.
>>> It's locked, some kind of security risk many kernels ago. I'll try
>>> changing that but I thought I tried it once before.
>>
>> Ah, it's mode is 0444 (read-only).  Sorry I missed that piece.
>> Sure, you could change the mode for your own use (rebuild the kernel).
>
>  # cat /proc/sys/kernel/random/poolsize
> 16384
> cat /proc/sys/kernel/random/entropy_avail
> 4096
>
> I guess there is more to it.
>

Bump
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