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

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Message-ID: <20070608203007.3c50eb66@the-village.bc.nu>
Date:	Fri, 8 Jun 2007 20:30:07 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Fri, 08 Jun 2007 11:43:29 -0700
Ulrich Drepper <drepper@...hat.com> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
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> Alan Cox wrote:
> > Why does he want an unpredictable algorithm
> 
> To avoid exactly the kind of problem we have now in future: programs
> relying on specific patterns.

Which you seem to think is a bad thing, yet is actually a very good thing
because it means that crashes are repeatable and problems are debuggable
from end user reports.

Trying to randomize filehandles for the general case is not a productive
activity. If you want to debug cases write yourself a glibc wrapper that
does annoying things but don't inflict it on people who actually want to
build working, testable, debuggable systems (ie most of us)

Alan
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