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

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Message-ID: <20070608203421.29fb9f15@the-village.bc.nu>
Date:	Fri, 8 Jun 2007 20:34:21 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Al Viro <viro@....linux.org.uk>,
	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

> We are talking about file descriptors here.  If you're using file
> descriptors as anything other than tokens you'll find out soon enough
> that your code is broken.  The new type of file descriptors cannot be
> used as indeces and the randomization makes sure that no program by some
> fluke happens to work.

If you are building a stable system and you test it and it passes
extensive testing you don't care if it works because of a specific
pattern of accesses since your testing shows that it continues to work.

If you randomize these it becomes fundamentally untestable. There is a
role for this in fuzz testing but there is not a role for it in normal
production behaviour.

Please consign the whole funky file handle farce to the bucket labelled
"dumb ideas". I know its a bit full but there is room in there for more -
unlike the kernel.

Alan
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