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

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Date:	Sat, 09 Jun 2007 10:08:59 -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:
> That's simply not true.  On the current kernel nothing stops you from e.g.
> picking a random number and using F_DUPFD.

Of course there are things stopping one from doing this (aside from the
kernel not allowing this in the moment at all since the highest fd
number is limited severely):

- - this scheme would only be use if it would be possible to have
completely random descriptor values.  But what has been said here
already is that this is too costly.  Hence the approach to randomize
only the base value.

- - there are two interface to use: open + fcntl.  This is racy.  And
don't tell me this doesn't matter.

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