From: Al Viro <viro@ftp.linux.org.uk>
To: Ulrich Drepper <drepper@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Davide Libenzi <davidel@xmailserver.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, Theodore Tso <tytso@mit.edu>,
Eric Dumazet <dada1@cosmosbay.com>,
Kyle Moffett <mrmacman_g4@mac.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2
Date: Sat, 9 Jun 2007 02:41:40 +0100 [thread overview]
Message-ID: <20070609014140.GC4095@ftp.linux.org.uk> (raw)
In-Reply-To: <466A0020.50406@redhat.com>
On Fri, Jun 08, 2007 at 06:19:28PM -0700, Ulrich Drepper wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Al Viro wrote:
> > Exactly. Put it another way, randomizer is a stress-tester.
>
> ... and a security mechanism. And as such it is only useful if it is
> used. Probably it should be policy-controlled whether you can turn it off.
Any real-world examples of exploitable holes based on that? Real blue-sky
world, not grsec-advocacy "undiscovered null ptr derefs on every corner and
all of the variety fixable by our magic goo" one, please.
> > Note that
> > #define NR_FILES <some constant>
> >
> > for (i = 0; i < NR_FILES; i++)
> > close(i);
>
> You're confusing the problems.
No, I'm not. The entire argument for having a separate set of descriptors
is based on programs behaving in similar fashion, working correctly now but
limiting what libraries can do with opening files for internal needs.
So here's the question: how widespread it really is, considering that "working
correctly" is not a trivial constraint. Again, I'd love to see real data;
if I need handwaving, I know where to find it.
next prev parent reply other threads:[~2007-06-09 1:42 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-06 22:30 [patch 7/8] fdmap v2 - implement sys_socket2 Davide Libenzi
2007-06-06 22:44 ` David Miller
2007-06-06 22:52 ` Davide Libenzi
2007-06-06 22:57 ` David Miller
2007-06-06 22:57 ` Ulrich Drepper
2007-06-06 23:02 ` David Miller
2007-06-06 22:59 ` Alan Cox
2007-06-06 22:58 ` Ulrich Drepper
2007-06-06 23:04 ` Davide Libenzi
2007-06-06 23:08 ` David Miller
2007-06-06 23:19 ` Alan Cox
2007-06-06 23:22 ` Ulrich Drepper
2007-06-07 10:04 ` Alan Cox
2007-06-07 11:59 ` Kyle Moffett
2007-06-07 13:12 ` Eric Dumazet
2007-06-07 15:51 ` Davide Libenzi
2007-06-07 19:49 ` Davide Libenzi
2007-06-07 20:02 ` Ulrich Drepper
2007-06-07 20:05 ` Eric Dumazet
2007-06-07 20:18 ` Ulrich Drepper
2007-06-07 21:44 ` Davide Libenzi
2007-06-07 22:03 ` Ulrich Drepper
2007-06-07 22:40 ` Davide Libenzi
2007-06-08 12:07 ` Theodore Tso
2007-06-08 13:01 ` Alan Cox
2007-06-08 18:11 ` Davide Libenzi
2007-06-08 18:26 ` Alan Cox
2007-06-08 18:43 ` Ulrich Drepper
2007-06-08 18:46 ` Al Viro
2007-06-08 18:56 ` Ulrich Drepper
2007-06-08 19:07 ` Linus Torvalds
2007-06-08 19:21 ` Davide Libenzi
2007-06-09 0:03 ` Linus Torvalds
2007-06-09 0:13 ` Davide Libenzi
2007-06-09 0:36 ` Al Viro
2007-06-09 1:19 ` Ulrich Drepper
2007-06-09 1:41 ` Al Viro [this message]
2007-06-09 2:10 ` Ulrich Drepper
2007-06-09 15:15 ` Al Viro
2007-06-09 16:26 ` Ulrich Drepper
2007-06-09 16:54 ` Al Viro
2007-06-09 17:04 ` Davide Libenzi
2007-06-09 17:08 ` Davide Libenzi
2007-06-09 17:08 ` Ulrich Drepper
2007-06-09 17:24 ` Al Viro
2007-06-09 19:27 ` Kyle Moffett
2007-06-09 20:06 ` Al Viro
2007-06-09 20:21 ` Linus Torvalds
2007-06-09 20:31 ` Davide Libenzi
2007-06-09 21:41 ` Matt Mackall
2007-06-09 22:12 ` Davide Libenzi
2007-06-09 20:49 ` Al Viro
2007-06-09 21:55 ` Matt Mackall
2007-06-09 23:33 ` Linus Torvalds
2007-06-10 3:35 ` Davide Libenzi
2007-06-10 3:49 ` Davide Libenzi
2007-06-10 3:19 ` Al Viro
2007-06-10 3:48 ` Linus Torvalds
2007-06-10 4:00 ` Al Viro
2007-06-10 4:03 ` Linus Torvalds
2007-06-10 4:06 ` Al Viro
2007-06-10 4:45 ` dean gaudet
2007-06-10 5:06 ` Linus Torvalds
2007-06-10 5:46 ` Al Viro
2007-06-10 17:23 ` Linus Torvalds
2007-06-10 6:35 ` Kari Hurtta
2007-06-10 15:21 ` Alan Cox
2007-06-10 9:14 ` Eric Dumazet
2007-06-10 15:16 ` Alan Cox
2007-06-10 18:19 ` Linus Torvalds
2007-06-10 2:40 ` Al Viro
2007-06-08 19:34 ` Alan Cox
2007-06-08 19:30 ` Alan Cox
2007-06-08 19:37 ` Davide Libenzi
2007-06-08 19:48 ` Alan Cox
2007-06-08 19:51 ` Davide Libenzi
2007-06-08 21:24 ` Alan Cox
2007-06-08 21:59 ` Davide Libenzi
2007-06-08 22:28 ` Alan Cox
2007-06-08 22:38 ` Davide Libenzi
2007-06-11 8:24 ` Xavier Bestel
2007-06-08 19:22 ` Davide Libenzi
2007-06-09 5:41 ` Paul Mackerras
2007-06-09 14:38 ` Kyle Moffett
2007-06-10 6:48 ` Paul Mackerras
2007-06-10 15:56 ` Davide Libenzi
2007-06-10 19:16 ` Davide Libenzi
2007-06-09 17:00 ` Davide Libenzi
2007-06-10 6:26 ` Paul Mackerras
2007-06-10 7:10 ` William Lee Irwin III
2007-06-10 15:52 ` Davide Libenzi
2007-06-08 18:07 ` Davide Libenzi
2007-06-08 18:35 ` Linus Torvalds
2007-06-07 21:57 ` Davide Libenzi
2007-06-08 4:38 ` Eric Dumazet
2007-06-08 5:20 ` Davide Libenzi
2007-06-07 14:25 ` Ulrich Drepper
2007-06-07 17:56 ` Eric Dumazet
2007-06-07 18:03 ` Davide Libenzi
2007-06-07 18:57 ` Eric Dumazet
2007-06-07 18:26 ` Ulrich Drepper
2007-06-07 18:39 ` Davide Libenzi
2007-06-07 18:56 ` Ulrich Drepper
2007-06-07 19:12 ` Davide Libenzi
2007-06-07 20:03 ` Andrew Morton
2007-06-08 2:55 ` Ulrich Drepper
2007-06-08 5:16 ` Davide Libenzi
2007-06-06 23:29 ` Davide Libenzi
2007-06-07 10:06 ` Alan Cox
2007-06-07 10:45 ` Eric Dumazet
2007-06-07 11:27 ` Alan Cox
2007-06-07 15:41 ` Davide Libenzi
2007-06-07 20:10 ` Linus Torvalds
2007-06-07 20:47 ` Eric Dumazet
2007-06-07 21:08 ` Linus Torvalds
2007-06-07 21:41 ` Davide Libenzi
2007-06-07 20:59 ` Guillaume Chazarain
2007-06-07 21:06 ` Guillaume Chazarain
2007-06-07 21:31 ` Ulrich Drepper
2007-06-07 22:22 ` Davide Libenzi
2007-06-07 23:42 ` Linus Torvalds
2007-06-08 0:04 ` Davide Libenzi
2007-06-08 0:59 ` Matt Mackall
2007-06-08 2:25 ` Linus Torvalds
2007-06-08 15:56 ` Jeff Dike
2007-06-07 0:29 ` Arnd Bergmann
2007-06-07 0:33 ` Davide Libenzi
-- strict thread matches above, loose matches on Subject: below --
2007-06-06 22:30 [patch 1/8] fdmap v2 - fdmap core Davide Libenzi
2007-06-07 6:54 ` Eric Dumazet
2007-06-07 7:10 ` Davide Libenzi
2007-06-07 10:39 ` [patch 7/8] fdmap v2 - implement sys_socket2 Eric Dumazet
2007-06-07 15:42 ` Davide Libenzi
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