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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 17 Jul 2014 20:48:11 +0200 (CEST)
From:	Mark Kettenis <mark.kettenis@...all.nl>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	linux-kernel@...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, 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;
> }

I'm sure you meant to use getrandom() there ;)

Since for LibreSSL we'd want a getentropy() that cannot fail the
getrandom() call should use GRND_BLOCK flag.  Actually it makes sense
(to me) to make blocking the default behaviour and have a
BRND_NONBLOCK flag.  Much in the same way as you need to specify
O_NONBLOCK if you want non-blocking behaviour for files.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/