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To: linux-nfs@vger.kernel.org
From: Chris J Arges <chris.j.arges@canonical.com>
Subject: Re: [PATCH] nfsd4: permit read opens of executable-only files
Date: Tue, 13 Dec 2011 17:38:54 +0000 (UTC)
Message-ID: <loom.20111213T183631-8@post.gmane.org>
References: <20110825161957.GC1114@fieldses.org> <loom.20111207T233110-295@post.gmane.org> <20111208212151.GF32505@fieldses.org>
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<snip>
> > 
> > 
> > Bruce,
> > 
> > I've tested this patch against linux-3.0 and it doesn't allow me to execute 
> > binaries with permissions of 111.
> 
> Hm, I see the same permissions error.  However, looking at the
> client-server traffic with wireshark, I see no permissions failures from
> the server: the read-open of cat succeeds.  (Could you check if the same
> is true in your case?)
> 
> So my first inclination is to blame the client.... Does this work with
> an older client?
> 
> --b.

Bruce,

Using the above test setup, and trying various clients I see a mismatch:

Using a newer nfs clients (nfs-common 1:1.2.2-4/1:1.2.4-1), I can read a file 
with 111 permissions, but cannot execute it.
With an older nfs client (nfs-common 1:1.2.0-4 / ubuntu lucid), I can read and 
execute a file with 111 permissions.

--chris j arges

<snip>