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Open Source and information security mailing list archives
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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. -- 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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