linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <466A0020.50406@redhat.com>
Date:	Fri, 08 Jun 2007 18:19:28 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Al Viro <viro@....linux.org.uk>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

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Al Viro wrote:
> Exactly.  Put it another way, randomizer is a stress-tester.

... and a security mechanism.  And as such it is only useful if it is
used.  Probably it should be policy-controlled whether you can turn it off.


> Note that
> #define NR_FILES <some constant>
> 
> for (i = 0; i < NR_FILES; i++)
> 	close(i);

You're confusing the problems.  This is not the argument for having a
separate file descriptor set.  It is the argument to have hidden file
descriptors.  Randomization has nothing whatsoever to do with this example.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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