Re: [PATCH] fs/file.c: __fget() and dup2() atomicity rules

[Al Viro]

On Mon, Jun 29, 2015 at 05:10:30PM +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@xxxxxxxxxx>
> 
> __fget() makes sure a file refcount is not zero before
> taking a reference. It should also fetch again file pointer
> in order to respect dup2() atomicity requirements.
> 
> It should either read a NULL pointer or a file on which
> a refcount can be taken.

Hmm...   The problem is real, but I wonder if one could trigger a long
spin there...
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