From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@novell.com>, Hugh Dickins <hugh@veritas.com>,
Andrea Arcangeli <aarcange@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org
Subject: Re: [aarcange@redhat.com: [PATCH] fork vs gup(-fast) fix]
Date: Wed, 11 Mar 2009 18:41:03 +0100 [thread overview]
Message-ID: <20090311174103.GA11979@elte.hu> (raw)
In-Reply-To: <alpine.LFD.2.00.0903111024320.32478@localhost.localdomain>
* Linus Torvalds <torvalds@linux-foundation.org> wrote:
> On Wed, 11 Mar 2009, Ingo Molnar wrote:
> >
> > FYI, in case you missed it. Large MM fix - and it's awfully
> > late in -rc7.
>
> Yeah, I'm not taking this at this point. No way, no-how.
>
> If there is no simpler and obvious fix, it needs to go through
> -stable, after having cooked in 2.6.30-rc for a while.
> Especially as this is a totally uninteresting usage case that
> I can't see as being at all relevant to any real world.
>
> Anybody who mixes O_DIRECT and fork() (and threads) is already
> doing some seriously strange things. Nothing new there.
Hm, is there any security impact? Andrea is talking about data
corruption. I'm wondering whether that's just corruption
relative to whatever twisted semantics O_DIRECT has in this case
[which would be harmless], or some true pagecache corruption
going across COW (or other) protection domains that could be
exploited [which would not be harmless].
Ingo
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next prev parent reply other threads:[~2009-03-11 17:41 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090311170611.GA2079@elte.hu>
2009-03-11 17:33 ` [aarcange@redhat.com: [PATCH] fork vs gup(-fast) fix] Linus Torvalds
2009-03-11 17:41 ` Ingo Molnar [this message]
2009-03-11 17:58 ` Linus Torvalds
2009-03-11 18:37 ` Andrea Arcangeli
2009-03-11 18:46 ` Linus Torvalds
2009-03-11 19:01 ` Linus Torvalds
2009-03-11 19:59 ` Andrea Arcangeli
2009-03-11 20:19 ` Linus Torvalds
2009-03-11 20:33 ` Linus Torvalds
2009-03-11 20:55 ` Andrea Arcangeli
2009-03-11 21:28 ` Linus Torvalds
2009-03-11 21:57 ` Andrea Arcangeli
2009-03-11 22:06 ` Linus Torvalds
2009-03-11 22:07 ` Linus Torvalds
2009-03-11 22:22 ` Davide Libenzi
2009-03-11 22:32 ` Linus Torvalds
2009-03-14 5:07 ` Benjamin Herrenschmidt
2009-03-11 20:48 ` Andrea Arcangeli
2009-03-14 5:06 ` Benjamin Herrenschmidt
2009-03-14 5:20 ` Nick Piggin
2009-03-16 16:01 ` KOSAKI Motohiro
2009-03-16 16:23 ` Nick Piggin
2009-03-16 16:32 ` Linus Torvalds
2009-03-16 16:50 ` Nick Piggin
2009-03-16 17:02 ` Linus Torvalds
2009-03-16 17:19 ` Nick Piggin
2009-03-16 17:42 ` Linus Torvalds
2009-03-16 18:02 ` Nick Piggin
2009-03-16 18:05 ` Nick Piggin
2009-03-16 18:17 ` Linus Torvalds
2009-03-16 18:33 ` Nick Piggin
2009-03-16 19:22 ` Linus Torvalds
2009-03-17 5:44 ` Nick Piggin
2009-03-16 18:14 ` Linus Torvalds
2009-03-16 18:29 ` Nick Piggin
2009-03-16 19:17 ` Linus Torvalds
2009-03-17 5:42 ` Nick Piggin
2009-03-17 5:58 ` Nick Piggin
2009-03-16 18:37 ` Andrea Arcangeli
2009-03-16 18:28 ` Andrea Arcangeli
2009-03-16 23:59 ` KAMEZAWA Hiroyuki
2009-03-18 2:04 ` KOSAKI Motohiro
2009-03-22 12:23 ` KOSAKI Motohiro
2009-03-23 0:13 ` KOSAKI Motohiro
2009-03-23 16:29 ` Ingo Molnar
2009-03-23 16:46 ` Linus Torvalds
2009-03-24 5:08 ` KOSAKI Motohiro
2009-03-24 13:43 ` Nick Piggin
2009-03-24 17:56 ` Linus Torvalds
2009-03-30 10:52 ` KOSAKI Motohiro
[not found] ` <200904022307.12043.nickpiggin@yahoo.com.au>
2009-04-03 3:49 ` Nick Piggin
2009-03-17 0:44 ` Linus Torvalds
2009-03-17 0:56 ` KAMEZAWA Hiroyuki
2009-03-17 12:19 ` Andrea Arcangeli
2009-03-17 16:43 ` Linus Torvalds
2009-03-17 17:01 ` Linus Torvalds
2009-03-17 17:10 ` Andrea Arcangeli
2009-03-17 17:43 ` Linus Torvalds
2009-03-17 18:09 ` Linus Torvalds
2009-03-17 18:19 ` Linus Torvalds
2009-03-17 18:46 ` Andrea Arcangeli
2009-03-17 19:03 ` Linus Torvalds
2009-03-17 19:35 ` Andrea Arcangeli
2009-03-17 19:55 ` Linus Torvalds
2009-03-11 19:06 ` Andrea Arcangeli
2009-03-12 5:36 ` Nick Piggin
2009-03-12 16:23 ` Nick Piggin
2009-03-12 17:00 ` Andrea Arcangeli
2009-03-12 17:20 ` Nick Piggin
2009-03-12 17:23 ` Nick Piggin
2009-03-12 18:06 ` Andrea Arcangeli
2009-03-12 18:58 ` Andrea Arcangeli
2009-03-13 16:09 ` Nick Piggin
2009-03-13 19:34 ` Andrea Arcangeli
2009-03-14 4:59 ` Nick Piggin
2009-03-16 13:56 ` Andrea Arcangeli
2009-03-16 16:01 ` Nick Piggin
2009-03-14 4:46 ` Nick Piggin
2009-03-14 5:06 ` Nick Piggin
2009-03-11 18:53 ` Andrea Arcangeli
2009-03-11 18:22 ` Andrea Arcangeli
2009-03-11 19:06 ` Ingo Molnar
2009-03-11 19:15 ` Andrea Arcangeli
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