linux-kernel - Re: [PATCH, RFC] random: introduce getrandom(2) system call

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Message-ID: <20140721002540.GA20595@rivest.lan>
Date:	Sun, 20 Jul 2014 17:25:40 -0700
From:	Dwayne Litzenberger <dlitz@...tz.net>
To:	Theodore Ts'o <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-abi@...r.kernel.org,
	linux-crypto@...r.kernel.org, beck@...nbsd.org
Subject: Re: [PATCH, RFC] random: introduce getrandom(2) system call

On Thu, Jul 17, 2014 at 01:01:16PM -0400, Theodore Ts'o wrote:
>The getrandom(2) system call is a superset of getentropy(2).  When we
>add the support for this into glibc, it won't be terribly difficult
>nor annoying to drop the following in alongside the standard support
>needed for any new system call:
>
>int getentropy(void *buf, size_t buflen)
>{
>	int	ret;
>
>	ret = getentropy(buf, buflen, 0);
>	return (ret > 0) ? 0 : ret;
>}
>
>The reason for the additional flags is that I'm trying to solve more
>problems than just getentropy()'s raison d'etre.  The discussion of
>this is in the commit description; let me know if there bits that I
>could make clearer.

This could still return predictable bytes during early boot, though, 
right?

-- 
Dwayne C. Litzenberger <dlitz@...tz.net>
 OpenPGP: 19E1 1FE8 B3CF F273 ED17  4A24 928C EC13 39C2 5CF7
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