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

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Message-ID: <466AD4BA.80407@redhat.com>
Date:	Sat, 09 Jun 2007 09:26:34 -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:
> So which code is supposed to do that open/write in your example?  Library?
> Unmodified application?  Application specifically modified to make *that*
> open() randomized?

Why should that matter?  All of the above.  Any piece of code can of
course choose to not be safe but it should have the opportunity to be,
too.  Currently that's not the case.  With an O_NONSEQFD flag to open it
would be trivial to change any code.  Or one can introduce a new set of
userlevel interfaces to create and write new files which then can do
even more.

In whatever way you look at it, there currently is a problem which
cannot be solved except with truly horrible, horrible hack (open N
descriptors and randomly select one to use; yep, horrible, I said so).

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