From: Matt Mackall <mpm@selenic.com>
To: David Lang <dlang@digitalinsight.com>
Cc: Bernard Normier <bernard@zeroc.com>,
"Theodore Ts'o" <tytso@mit.edu>,
linux-kernel@vger.kernel.org
Subject: Re: Concurrent access to /dev/urandom
Date: Wed, 8 Dec 2004 20:52:07 -0800 [thread overview]
Message-ID: <20041209045207.GB12189@waste.org> (raw)
In-Reply-To: <Pine.LNX.4.60.0412081905140.17193@dlang.diginsite.com>
On Wed, Dec 08, 2004 at 07:10:16PM -0800, David Lang wrote:
> On Tue, 7 Dec 2004, Bernard Normier wrote:
>
> >I am just trying to generate UUIDs (without duplicates, obviously).
> >
>
> pulling data from /dev/random or /dev/urandom will not ensure that you
> don't have duplicates.
No, but this problem can generate duplicates as large as an SHA hash
with relative ease when it should be essentially impossible. In other
words, it works exactly wrong for UUIDs, which needs fixing.
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2004-12-09 4:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-27 20:45 Concurrent access to /dev/urandom Bernard Normier
2004-11-27 20:56 ` Jan Engelhardt
2004-11-27 21:15 ` Bernard Normier
2004-11-27 21:22 ` Jan Engelhardt
2004-11-28 20:58 ` Bernard Normier
2004-12-07 23:41 ` Bernard Normier
2004-12-08 1:28 ` Theodore Ts'o
2004-12-08 1:56 ` Bernard Normier
2004-12-08 19:21 ` Theodore Ts'o
2004-12-08 20:15 ` Bernard Normier
2004-12-08 21:56 ` Matt Mackall
2004-12-09 1:57 ` Theodore Ts'o
2004-12-09 2:46 ` andyliu
2004-12-09 4:55 ` Matt Mackall
2004-12-09 2:58 ` Matt Mackall
2004-12-09 21:29 ` Matt Mackall
2004-12-10 4:47 ` Matt Mackall
2004-12-10 16:35 ` Theodore Ts'o
2004-12-10 18:28 ` Matt Mackall
2004-12-10 21:28 ` Theodore Ts'o
2004-12-10 22:23 ` Matt Mackall
2004-12-11 0:22 ` Adam Heath
2004-12-11 1:10 ` Matt Mackall
2004-12-11 17:33 ` Theodore Ts'o
2004-12-11 19:58 ` Adam Heath
2004-12-11 20:40 ` Matt Mackall
2004-12-12 16:19 ` Pavel Machek
2004-12-11 0:19 ` Adam Heath
2004-12-09 3:10 ` David Lang
2004-12-09 4:52 ` Matt Mackall [this message]
2004-12-09 6:36 ` Theodore Ts'o
2004-11-29 22:47 ` Jon Masters
2004-11-29 23:14 ` Bernard Normier
2004-11-29 23:43 ` Sven-Haegar Koch
2004-11-30 2:31 ` David Schwartz
2004-11-30 4:14 ` Kyle Moffett
2004-11-30 8:23 ` Jan Engelhardt
2004-11-30 18:50 ` David Schwartz
2004-11-29 23:42 ` David Wagner
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