Re: isakmpd-20041012 patch for /dev/random hang on arm linux 2.4.27-vrs1

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02-18-2008, 08:54 AM

Damien Miller

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Re: isakmpd-20041012 patch for /dev/random hang on arm linux 2.4.27-vrs1

On Wed, 11 Oct 2006, Dimitry Andric wrote:

> Michael Grigoni wrote:
> > I have ported isakmpd based on code from 2004-10-12 with patches
> > for linux to arm4l-linux-2.4.27-vrs1. It hangs in exchange_establish()
> > and becomes unresponsive to fifo input or signals. The hang occurs
> > in arc4stir() while trying to read /dev/random; the fix is to use
> > /dev/urandom.
>
> Are you crazy? Those random devices are SUPPOSED to block if there is
> no sufficient entropy available. If you don't care about the quality of
> random number output, you might as well stop using IPsec.

Don't be silly. Use of a good PRNG that doesn't block (like urandom or
arandom) is perfectly acceptable here and this matches OpenBSD's
behaviour.

-d

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Re: isakmpd-20041012 patch for /dev/random hang on arm linux 2.4.27-vrs1