linux-kernel - Re: [PATCH v2] - Randomize node rotor used in cpuset_mem_spread

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 linux-cve-announce PHC
Open Source and information security mailing list archives

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

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

Message-ID: <20100428162246.7e4632dc@nehalam>
Date:	Wed, 28 Apr 2010 16:22:46 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matt Mackall <mpm@...enic.com>, Jack Steiner <steiner@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] - Randomize node rotor used in
 cpuset_mem_spread_node()

On Wed, 28 Apr 2010 16:12:44 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 28 Apr 2010 18:04:06 -0500
> Matt Mackall <mpm@...enic.com> wrote:
> 
> > > I suspect random32() would suffice here.  It avoids depleting the
> > > entropy pool altogether.
> > 
> > I wouldn't worry about that. get_random_int() touches the urandom pool,
> > which will always leave entropy around. Also, Ted and I decided over a
> > year ago that we should drop the whole entropy accounting framework,
> > which I'll get around to some rainy weekend.
> 
> hm, so why does random32() exist?  Speed?

Because I need a cheap fast pseudo-random source for emulation
and it got used for more and more non-cryptographic uses.
And like most random generators people keep forgetting that
it was not intended for security use.

-- 
--
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/