From: Benjamin LaHaise <bcrl@redhat.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: John Bradford <john@grabjohn.com>, linux-kernel@vger.kernel.org
Subject: Re: Minutes from Feb 21 LSE Call
Date: Sun, 23 Feb 2003 20:25:12 -0500 [thread overview]
Message-ID: <20030223202512.B15376@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0302231343050.1534-100000@home.transmeta.com>; from torvalds@transmeta.com on Sun, Feb 23, 2003 at 01:45:16PM -0800
On Sun, Feb 23, 2003 at 01:45:16PM -0800, Linus Torvalds wrote:
> The x86 has that stupid "executablility is tied to a segment" thing, which
> means that you cannot make things executable on a page-per-page level.
> It's a mistake, but it's one that _could_ be fixed in the architecture if
> it really mattered, the same way the WP bit got fixed in the i486.
I've been thinking about this recently, and it turns out that the whole
point is moot with a fixed address vsyscall page: non-exec stacks are
trivially circumvented by using the vsyscall page as a known starting
point for the exploite. All the other tricks of changing the starting
stack offset and using randomized load addresses don't help at all,
since the exploite can merely use the vsyscall page to perform various
operations. Personally, I'm still a fan of the shared library vsyscall
trick, which would allow us to randomize its laod address and defeat
this problem.
-ben
next prev parent reply other threads:[~2003-02-24 1:15 UTC|newest]
Thread overview: 274+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-21 23:48 Minutes from Feb 21 LSE Call Hanna Linder
2003-02-22 0:16 ` Larry McVoy
2003-02-22 0:25 ` William Lee Irwin III
2003-02-22 2:24 ` Steven Cole
2003-02-22 0:44 ` Martin J. Bligh
2003-02-22 2:47 ` Larry McVoy
2003-02-22 4:32 ` Martin J. Bligh
2003-02-22 5:05 ` Larry McVoy
2003-02-22 6:39 ` Martin J. Bligh
2003-02-22 8:38 ` Jeff Garzik
2003-02-22 22:18 ` William Lee Irwin III
2003-02-23 0:50 ` Martin J. Bligh
2003-02-23 11:22 ` Magnus Danielson
2003-02-23 19:54 ` Eric W. Biederman
2003-02-23 1:17 ` Benjamin LaHaise
2003-02-23 5:21 ` Gerrit Huizenga
2003-02-23 8:07 ` David Lang
2003-02-23 8:20 ` William Lee Irwin III
2003-02-23 19:17 ` Linus Torvalds
2003-02-23 19:29 ` David Mosberger
2003-02-23 20:13 ` Martin J. Bligh
2003-02-23 22:01 ` David Mosberger
2003-02-23 22:12 ` Martin J. Bligh
2003-02-23 21:34 ` Linus Torvalds
2003-02-23 22:40 ` David Mosberger
2003-02-23 22:48 ` David Lang
2003-02-23 22:54 ` David Mosberger
2003-02-23 22:56 ` David Lang
2003-02-24 0:40 ` Linus Torvalds
2003-02-24 2:32 ` David Mosberger
2003-02-24 2:54 ` Linus Torvalds
2003-02-24 3:08 ` David Mosberger
2003-02-24 21:42 ` Andrea Arcangeli
2003-02-24 1:06 ` dean gaudet
2003-02-24 1:56 ` David Mosberger
2003-02-24 2:15 ` dean gaudet
2003-02-24 3:11 ` David Mosberger
2003-02-23 23:06 ` Martin J. Bligh
2003-02-23 23:59 ` David Mosberger
2003-02-24 3:49 ` Gerrit Huizenga
2003-02-24 4:07 ` David Mosberger
2003-02-24 4:34 ` Martin J. Bligh
2003-02-24 5:02 ` Gerrit Huizenga
2003-02-23 20:21 ` Xavier Bestel
2003-02-23 20:50 ` Martin J. Bligh
2003-02-23 23:57 ` Alan Cox
2003-02-24 1:26 ` Kenneth Johansson
2003-02-24 1:53 ` dean gaudet
2003-02-23 21:35 ` Alan Cox
2003-02-23 21:41 ` Linus Torvalds
2003-02-24 0:01 ` Bill Davidsen
2003-02-24 0:36 ` yodaiken
2003-02-23 21:15 ` John Bradford
2003-02-23 21:45 ` Linus Torvalds
2003-02-24 1:25 ` Benjamin LaHaise [this message]
2003-02-23 21:55 ` William Lee Irwin III
2003-02-23 19:13 ` David Mosberger
2003-02-23 23:28 ` Benjamin LaHaise
2003-02-26 8:46 ` Eric W. Biederman
2003-02-23 20:48 ` Gerrit Huizenga
2003-02-23 9:37 ` William Lee Irwin III
2003-02-22 8:38 ` David S. Miller
2003-02-22 8:38 ` David S. Miller
2003-02-22 14:34 ` Larry McVoy
2003-02-22 15:47 ` Martin J. Bligh
2003-02-22 16:13 ` Larry McVoy
2003-02-22 16:29 ` Martin J. Bligh
2003-02-22 16:33 ` Larry McVoy
2003-02-22 16:39 ` Martin J. Bligh
2003-02-22 16:59 ` John Bradford
2003-02-24 18:00 ` Timothy D. Witham
2003-02-22 8:32 ` David S. Miller
2003-02-22 18:20 ` Alan Cox
2003-02-22 20:05 ` William Lee Irwin III
2003-02-22 21:35 ` Alan Cox
2003-02-22 21:36 ` Gerrit Huizenga
2003-02-22 21:42 ` Christoph Hellwig
2003-02-23 23:23 ` Bill Davidsen
2003-02-24 3:31 ` Gerrit Huizenga
2003-02-24 4:02 ` Larry McVoy
2003-02-24 4:15 ` Russell Leighton
2003-02-24 5:11 ` William Lee Irwin III
2003-02-24 8:07 ` Christoph Hellwig
2003-02-23 0:37 ` Eric W. Biederman
2003-02-23 0:42 ` Eric W. Biederman
2003-02-23 14:29 ` Rik van Riel
2003-02-23 17:28 ` Eric W. Biederman
2003-02-24 1:42 ` Benjamin LaHaise
2003-02-23 3:24 ` Andrew Morton
2003-02-23 16:14 ` object-based rmap and pte-highmem Martin J. Bligh
2003-02-23 19:20 ` Linus Torvalds
2003-02-23 20:16 ` Martin J. Bligh
2003-02-23 21:37 ` Linus Torvalds
2003-02-23 22:07 ` pte-highmem vs UKVA (was: object-based rmap and pte-highmem) Martin J. Bligh
2003-02-23 22:10 ` William Lee Irwin III
2003-02-24 0:31 ` Linus Torvalds
2003-02-24 3:07 ` Martin J. Bligh
2003-02-25 17:17 ` Minutes from Feb 21 LSE Call Andrea Arcangeli
2003-02-25 17:43 ` William Lee Irwin III
2003-02-25 17:59 ` Andrea Arcangeli
2003-02-25 18:04 ` William Lee Irwin III
2003-02-25 18:50 ` William Lee Irwin III
2003-02-25 19:18 ` Andrea Arcangeli
2003-02-25 19:27 ` Martin J. Bligh
2003-02-25 20:30 ` Andrea Arcangeli
2003-02-25 20:53 ` Martin J. Bligh
2003-02-25 21:17 ` Andrea Arcangeli
2003-02-25 21:12 ` Martin J. Bligh
2003-02-25 22:16 ` Andrea Arcangeli
2003-02-25 22:17 ` Martin J. Bligh
2003-02-25 22:37 ` Andrea Arcangeli
2003-02-25 21:26 ` William Lee Irwin III
2003-02-25 22:18 ` Andrea Arcangeli
2003-02-26 5:24 ` Rik van Riel
2003-02-26 5:38 ` William Lee Irwin III
2003-02-26 6:01 ` Martin J. Bligh
2003-02-26 6:14 ` William Lee Irwin III
2003-02-26 6:32 ` William Lee Irwin III
2003-02-26 16:02 ` Rik van Riel
2003-02-27 3:48 ` Daniel Phillips
2003-02-25 20:10 ` William Lee Irwin III
2003-02-25 20:23 ` Andrea Arcangeli
2003-02-25 20:46 ` William Lee Irwin III
2003-02-25 20:52 ` Andrea Arcangeli
[not found] <Pine.LNX.4.44.0302221417120.2686-100000@coffee.psychology.mcmaster.ca>
[not found] ` <1510000.1045942974@[10.10.2.4]>
2003-02-22 19:56 ` Larry McVoy
2003-02-22 20:24 ` William Lee Irwin III
2003-02-22 21:02 ` Martin J. Bligh
2003-02-22 22:06 ` Mark Hahn
2003-02-22 22:17 ` William Lee Irwin III
2003-02-22 23:28 ` Larry McVoy
2003-02-22 23:47 ` Martin J. Bligh
2003-02-23 0:09 ` Gerrit Huizenga
2003-02-23 8:01 ` Larry McVoy
2003-02-23 8:05 ` William Lee Irwin III
2003-02-24 18:36 ` Andy Pfiffer
2003-02-22 22:44 ` Ben Greear
2003-02-23 23:29 ` Bill Davidsen
2003-02-23 23:37 ` Martin J. Bligh
2003-02-24 4:57 ` Larry McVoy
2003-02-24 6:10 ` Gerhard Mack
2003-02-24 6:52 ` Larry McVoy
2003-02-24 7:46 ` Bill Huey
2003-02-24 7:44 ` Bill Huey
2003-02-24 7:54 ` William Lee Irwin III
2003-02-24 8:00 ` Bill Huey
2003-02-24 8:40 ` Andrew Morton
2003-02-24 8:50 ` William Lee Irwin III
2003-02-24 16:17 ` yodaiken
2003-02-24 23:13 ` William Lee Irwin III
2003-02-24 23:27 ` yodaiken
2003-02-24 23:54 ` William Lee Irwin III
2003-02-24 23:54 ` yodaiken
2003-02-25 2:17 ` Bill Huey
2003-02-25 2:24 ` yodaiken
2003-02-25 2:35 ` Bill Huey
2003-02-25 2:43 ` Bill Huey
2003-02-25 2:32 ` Larry McVoy
2003-02-25 2:40 ` Bill Huey
2003-02-25 5:24 ` Rik van Riel
2003-02-25 15:30 ` Alan Cox
2003-02-25 14:59 ` Bill Huey
2003-02-25 15:44 ` yodaiken
2003-02-26 19:31 ` Bill Davidsen
2003-02-27 0:56 ` Bill Huey
2003-02-27 20:04 ` Bill Davidsen
2003-02-25 2:07 ` Bill Huey
2003-02-25 2:14 ` Larry McVoy
2003-02-25 2:24 ` Bill Huey
2003-02-25 2:46 ` Valdis.Kletnieks
2003-02-25 14:47 ` Mr. James W. Laferriere
2003-02-25 15:59 ` Jesse Pollard
2003-02-24 8:56 ` Bill Huey
2003-02-24 9:09 ` Andrew Morton
2003-02-24 9:24 ` Bill Huey
2003-02-24 9:56 ` Andrew Morton
2003-02-24 10:11 ` Bill Huey
2003-02-24 14:40 ` Bill Davidsen
2003-02-24 21:10 ` Andrea Arcangeli
2003-02-24 8:43 ` William Lee Irwin III
2003-02-22 23:10 ` Martin J. Bligh
2003-02-22 23:20 ` Larry McVoy
2003-02-22 23:46 ` Martin J. Bligh
2003-02-25 2:19 ` Hans Reiser
2003-02-25 3:49 ` Martin J. Bligh
2003-02-25 5:12 ` Steven Cole
2003-02-25 20:37 ` Scott Robert Ladd
2003-02-25 21:36 ` Hans Reiser
2003-02-25 23:28 ` Scott Robert Ladd
2003-02-25 23:41 ` Hans Reiser
2003-02-26 0:19 ` Scott Robert Ladd
2003-02-26 0:35 ` Hans Reiser
2003-02-26 16:31 ` Horst von Brand
2003-02-26 0:47 ` Steven Cole
2003-02-26 16:07 ` Horst von Brand
2003-02-26 19:47 ` Alan Cox
2003-02-26 6:04 ` Aaron Lehmann
2003-02-26 0:44 ` Alan Cox
2003-02-25 23:58 ` Scott Robert Ladd
2003-02-22 23:15 ` Larry McVoy
2003-02-22 23:23 ` Christoph Hellwig
2003-02-22 23:54 ` Mark Hahn
2003-02-22 23:44 ` Martin J. Bligh
2003-02-24 4:56 ` Larry McVoy
2003-02-24 5:06 ` William Lee Irwin III
2003-02-24 6:00 ` Mark Hahn
2003-02-24 6:02 ` William Lee Irwin III
2003-02-24 15:06 ` Alan Cox
2003-02-24 23:18 ` William Lee Irwin III
2003-02-24 5:16 ` Martin J. Bligh
2003-02-24 6:58 ` Larry McVoy
2003-02-24 7:39 ` Martin J. Bligh
2003-02-24 16:17 ` Larry McVoy
2003-02-24 16:49 ` Martin J. Bligh
2003-02-24 18:22 ` John W. M. Stevens
2003-02-24 7:51 ` William Lee Irwin III
2003-02-24 15:47 ` Larry McVoy
2003-02-24 16:00 ` Martin J. Bligh
2003-02-24 16:23 ` Benjamin LaHaise
2003-02-24 16:25 ` yodaiken
2003-02-24 18:20 ` Gerrit Huizenga
2003-02-24 16:31 ` Larry McVoy
2003-02-24 23:36 ` William Lee Irwin III
2003-02-25 0:23 ` Larry McVoy
2003-02-25 2:37 ` Werner Almesberger
2003-02-25 4:42 ` William Lee Irwin III
2003-02-25 4:54 ` Larry McVoy
2003-02-25 6:00 ` William Lee Irwin III
2003-02-25 7:00 ` Val Henson
2003-02-24 13:28 ` Alan Cox
2003-02-25 5:19 ` Chris Wedgwood
2003-02-25 5:26 ` William Lee Irwin III
2003-02-25 21:21 ` Chris Wedgwood
2003-02-25 21:14 ` Martin J. Bligh
2003-02-25 21:21 ` William Lee Irwin III
2003-02-25 22:08 ` Larry McVoy
2003-02-25 22:10 ` William Lee Irwin III
2003-02-25 22:37 ` Chris Wedgwood
2003-02-25 22:58 ` Larry McVoy
2003-02-25 6:17 ` Martin J. Bligh
2003-02-25 17:11 ` Cliff White
2003-02-25 17:17 ` William Lee Irwin III
2003-02-25 17:38 ` Linus Torvalds
2003-02-25 19:54 ` Dave Jones
2003-02-26 2:04 ` Linus Torvalds
2003-02-25 19:48 ` Martin J. Bligh
2003-02-25 21:28 ` William Lee Irwin III
2003-02-25 19:20 ` Alan Cox
2003-02-25 19:59 ` Scott Robert Ladd
2003-02-25 20:18 ` jlnance
2003-02-25 20:59 ` Scott Robert Ladd
2003-02-25 21:19 ` Chris Wedgwood
2003-02-25 21:38 ` Scott Robert Ladd
2003-02-24 18:44 ` Davide Libenzi
2003-02-22 23:57 ` Jeff Garzik
2003-02-23 23:57 ` Bill Davidsen
2003-02-24 6:22 ` Val Henson
2003-02-24 6:41 ` William Lee Irwin III
2003-02-22 21:29 ` Jeff Garzik
-- strict thread matches above, loose matches on Subject: below --
2003-02-24 2:04 linux
2003-02-24 2:39 ` Linus Torvalds
2003-02-24 3:28 ` David Lang
2003-02-26 5:30 ` Bernd Eckenfels
2003-02-26 5:42 ` William Lee Irwin III
2003-02-26 7:22 ` David Lang
2003-02-27 17:50 ` Daniel Egger
2003-02-27 18:25 ` David Lang
2003-02-28 8:58 ` Filip Van Raemdonck
2003-02-28 19:48 ` Arador
2003-03-01 0:51 ` Chris Wedgwood
2003-03-01 1:14 ` Davide Libenzi
2003-03-01 1:27 ` David Lang
2003-03-01 14:15 ` Daniel Egger
2003-02-24 4:42 ` Martin J. Bligh
2003-02-24 4:58 ` Linus Torvalds
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20030223202512.B15376@redhat.com \
--to=bcrl@redhat.com \
--cc=john@grabjohn.com \
--cc=linux-kernel@vger.kernel.org \
--cc=torvalds@transmeta.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox