From: Jamie Lokier <jamie@shareable.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Christoph Hellwig <hch@infradead.org>,
linux-kernel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>,
Ulrich Drepper <drepper@redhat.com>
Subject: Re: [patch] futex API cleanups, futex-api-cleanup-2.5.69-A2
Date: Tue, 20 May 2003 00:33:53 +0100 [thread overview]
Message-ID: <20030519233353.GD13706@mail.jlokier.co.uk> (raw)
In-Reply-To: <Pine.LNX.4.44.0305191752130.13233-100000@localhost.localdomain>
Ingo Molnar wrote:
> > > - start the phasing out of FUTEX_FD. This i believe is quite unclean and
> > > unrobust, [...]
>
> FUTEX_FD is an instant DoS, it allows the pinning of one page per file
> descriptor, per thread. With a default limit of 1024 open files per
> thread, and 256 threads (on a sane/conservative setup), this means 1 GB of
> RAM can be pinned down by a normal unprivileged user.
The correct solution [;)] is EP_FUTEX - allow a futex to be specified
as the source of an epoll event.
-- Jamie
next prev parent reply other threads:[~2003-05-19 23:21 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-19 9:31 [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Ingo Molnar
2003-05-19 10:10 ` Christoph Hellwig
2003-05-19 10:16 ` Ingo Molnar
2003-05-19 11:49 ` Christoph Hellwig
2003-05-19 12:33 ` [patch] futex API cleanups, futex-api-cleanup-2.5.69-A2 Ingo Molnar
2003-05-19 12:51 ` Ingo Molnar
2003-05-19 14:47 ` bert hubert
2003-05-19 16:02 ` Ingo Molnar
2003-05-19 15:18 ` Linus Torvalds
2003-05-19 16:06 ` Ingo Molnar
2003-05-19 23:33 ` Jamie Lokier [this message]
2003-05-20 0:39 ` Rusty Russell
2003-05-20 1:14 ` Davide Libenzi
2003-05-20 1:44 ` Jamie Lokier
2003-05-20 16:54 ` Davide Libenzi
2003-05-20 17:59 ` Jamie Lokier
2003-05-21 23:56 ` Davide Libenzi
2003-05-20 1:50 ` Jamie Lokier
2003-05-20 0:15 ` Rusty Russell
2003-05-20 0:08 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Rusty Russell
2003-05-20 0:31 ` Valdis.Kletnieks
2003-05-19 10:23 ` Andrew Morton
2003-05-19 10:30 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D4 Ingo Molnar
2003-05-20 0:04 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Rusty Russell
2003-05-20 0:40 ` Ulrich Drepper
2003-05-20 1:46 ` Rusty Russell
2003-05-20 2:11 ` Ulrich Drepper
2003-05-20 6:27 ` Ingo Molnar
2003-05-20 6:56 ` Christoph Hellwig
2003-05-20 8:57 ` Rusty Russell
2003-05-20 9:03 ` Ingo Molnar
2003-05-20 9:51 ` Christoph Hellwig
2003-05-20 12:56 ` [patch] futex patches, futex-2.5.69-A2 Ingo Molnar
2003-05-20 14:08 ` Christoph Hellwig
2003-05-20 16:02 ` Ingo Molnar
2003-05-20 19:55 ` Christoph Hellwig
2003-05-21 5:06 ` Martin Schlemmer
2003-05-21 6:31 ` Christoph Hellwig
2003-05-20 15:46 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Linus Torvalds
2003-05-20 9:12 ` Ingo Oeser
2003-05-20 15:41 ` Linus Torvalds
2003-05-20 8:55 ` Rusty Russell
2003-05-20 6:19 ` Ingo Molnar
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