linux-kernel - Re: Seeding /dev/random not working

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Message-ID: <20070529163056.GE9899@thunk.org>
Date:	Tue, 29 May 2007 12:30:56 -0400
From:	Theodore Tso <tytso@....edu>
To:	Pavel Machek <pavel@....cz>
Cc:	M Macnair <mmacnair@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Seeding /dev/random not working

On Tue, May 29, 2007 at 02:14:56PM +0000, Pavel Machek wrote:
> Can we get at least time-of-boot from rtc clock to the pool? We really
> should not be getting identical outputs...

We are mixing the time-of-dat at boot time into the pool already,
using ktime_get_real() in random.c:init_std_data().  The problem
though is if the board doesn't have a valid RTC clock, or its battery
is dead, and the time-of-day clock is getting set by userspace, then
unless userspace also mixes in the time once it's been set via ntpdate
or whatever, it won't help the entropy pool.

						- Ted

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