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

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Message-ID: <Pine.LNX.4.64.0706092138340.10324@twinlark.arctic.org>
Date:	Sat, 9 Jun 2007 21:45:09 -0700 (PDT)
From:	dean gaudet <dean@...tic.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Al Viro <viro@....linux.org.uk>,
	Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	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, Linus Torvalds wrote:

> IOW, the most common case for libraries is not that they get invoced to do 
> one thing, but that they get loaded and then used over and over and over 
> again, and the _reason_ for wanting to have a file descriptor open may 
> well be that the library wants to cache the file descriptor, rather than 
> having to open a file over and over again!

for an example of a library wanting to cache an open fd ... and failing 
miserably at protecting itself from the application closing its fd read:

http://bugzilla.padl.com/show_bug.cgi?id=304
http://bugzilla.padl.com/show_bug.cgi?id=305

basically libnss-ldap is trying to use getsockname/getpeername to prove 
that an fd belongs to it.  the failure modes are quite delightful.

-dean
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