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Date: Wed, 24 Mar 2010 15:28:54 -0600 From: Jonathan Corbet <corbet@....net> To: Andrea Arcangeli <aarcange@...hat.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mel@....ul.ie>, Christoph Lameter <cl@...ux-foundation.org>, Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>, David Rientjes <rientjes@...gle.com>, Minchan Kim <minchan.kim@...il.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH 07/11] Memory compaction core On Wed, 24 Mar 2010 22:19:24 +0100 Andrea Arcangeli <aarcange@...hat.com> wrote: > > > It's a bit strange to test this when we're about to oops anyway. The > > > oops will tell us the same thing. > > > > ...except that we've seen a fair number of null pointer dereference > > exploits that have told us something altogether different. Are we > > *sure* we don't want to test for null pointers...? > > Examples? Maybe WARN_ON != oops, but VM_BUG_ON still an oops that is > and without serial console it would go lost too. I personally don't > see how it's needed. I don't quite understand the question; are you asking for examples of exploits? http://lwn.net/Articles/347006/ http://lwn.net/Articles/360328/ http://lwn.net/Articles/342330/ ... As to whether this particular test makes sense, I don't know. But the idea that we never need to test about-to-be-dereferenced pointers for NULL does worry me a bit. jon -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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