From: Cyril Hrubis <chrubis@suse.cz>
To: ltp@lists.linux.it
Subject: [LTP] [PATCH v2] getrandom02: relax check for returned data
Date: Wed, 8 Feb 2017 15:12:51 +0100 [thread overview]
Message-ID: <20170208141250.GE16139@rei.lan> (raw)
In-Reply-To: <886b49c2db9b9b6f65f7d92a2e91dbf3943e9607.1486562481.git.jstancek@redhat.com>
Hi!
> "nb * 0.1" can easily fail for nb < 20, since all we need
> are 2 identical bytes. Worst case (nb == 19) is almost
> identical to "birthday problem", but with smaller pool.
> Chance of hitting 2 identical bytes in pool of 19
> is close to 50%.
>
> Adjust formula to allow small repetitions in small pools.
> Chance we fail now should be pretty unlikely, ~10^-16.
>
> Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked.
--
Cyril Hrubis
chrubis@suse.cz
next prev parent reply other threads:[~2017-02-08 14:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-08 14:04 [LTP] [PATCH v2] getrandom02: relax check for returned data Jan Stancek
2017-02-08 14:12 ` Cyril Hrubis [this message]
2017-02-08 14:18 ` Jan Stancek
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