* Re: [patch 01/28] fs: d_validate fixes
[not found] ` <20101116142028.254946611@kernel.dk>
@ 2010-11-17 10:44 ` Andi Kleen
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From: Andi Kleen @ 2010-11-17 10:44 UTC (permalink / raw)
To: Nick Piggin; +Cc: linux-fsdevel, linux-kernel, linux-nfs
Nick Piggin <npiggin@kernel.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@linux.intel.com -- Speaking for myself only.
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2010-11-17 10:44 ` [patch 01/28] fs: d_validate fixes Andi Kleen
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