linux-kernel - Re: [patch 01/28] fs: d

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Message-ID: <87bp5orzzz.fsf@basil.nowhere.org>
Date:	Wed, 17 Nov 2010 11:44:16 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nfs@...r.kernel.org
Subject: Re: [patch 01/28] fs: d_validate fixes

Nick Piggin <npiggin@...nel.dk> writes:

> d_validate has been broken for a long time.
>
> kmem_ptr_validate does not guarantee that a pointer can be dereferenced
> if it can go away at any time. Even rcu_read_lock doesn't help, because
> the pointer might be queued in RCU callbacks but not executed yet.

I wonder if that is a problem for NFS ... (which I believe is the only
user). Could these races be used to break the NFS server?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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