From: Andrea Arcangeli <aarcange@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Nick Piggin <npiggin@novell.com>, Hugh Dickins <hugh@veritas.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 19:53:39 +0100 [thread overview]
Message-ID: <20090311185339.GL27823@random.random> (raw)
In-Reply-To: <20090311174103.GA11979@elte.hu>
Hello,
On Wed, Mar 11, 2009 at 06:41:03PM +0100, Ingo Molnar wrote:
> 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
I don't think it's exploitable and I don't see this much as a security
issue. This can only corrupt user data inside anonymous pages (not
filesystem metadata or kernel pagecache). Side effects will be the
usual ones of random user memory corruption or as worse it can lead to
I/O corruption on disk, but only in user data.
--
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next prev parent reply other threads:[~2009-03-11 18:53 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
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 [this message]
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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