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

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Message-ID: <20070609214120.GD11166@waste.org>
Date:	Sat, 9 Jun 2007 16:41:20 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>,
	Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.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

On Sat, Jun 09, 2007 at 01:31:56PM -0700, Davide Libenzi wrote:
> On Sat, 9 Jun 2007, Linus Torvalds wrote:
> 
> > So I think both the FD_CLOEXEC _and_ the "private fd space" are real 
> > issues. I don't agree with the "random fd" approach. I'd much rather have 
> > a non-random setup for the nonlinear ones (it just shouldn't be linear).
> 
> That is fine for me. So what about the randomness?
> 
> A) Don't do it at all
> 
> B) Let userspace select it in some way globally
> 
> C) Let userspace select it per-fd (this won't be an O(1) anymore though)

It should be handled the same way that VMA layout randomness is
handled. There are multiple knobs including ELF markers and /proc
bits.

-- 
Mathematics is the supreme nostalgia of our time.
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