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

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Date:	Sat, 9 Jun 2007 15:12:54 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Matt Mackall <mpm@...enic.com>
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, 9 Jun 2007, Matt Mackall wrote:

> 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.

You mean a global bit controlled by /proc, eventually overridden by an ELF 
flag? An maybe a prctl() to give sw configurability?



- Davide


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