RE: Execute only permission issue with client

["Frank Filz" <ffilzlnx@mindspring.com>]

Ok, got another question related...

I am running a test that does make the following system call:

open("/mnt/foo", O_CREAT | O_TRUNC | O_RDWR, 0);

This fails (at least when run from my Fedora 20 client, against either Ganesha OR knfsd).

When I look at a wireshark trace, I see that the sequence of ops in the COMPOUND is:

OPEN, ACCESS

I would expect the ACCESS to fail since the created file has mode 000.

Has this been resolved differently in a more recent kernel?

Thanks

Frank

> -----Original Message-----
> From: linux-nfs-owner@vger.kernel.org [mailto:linux-nfs-
> owner@vger.kernel.org] On Behalf Of Trond Myklebust
> Sent: Wednesday, June 25, 2014 3:34 PM
> To: Frank Filz
> Cc: Linux NFS Mailing List
> Subject: Re: Execute only permission issue with client
> 
> On Wed, Jun 25, 2014 at 6:29 PM, Frank Filz <ffilzlnx@mindspring.com>
> wrote:
> >> On Wed, Jun 25, 2014 at 5:56 PM, Frank Filz <ffilzlnx@mindspring.com>
> >> wrote:
> >> > Back a year ago or so, I ran the following test against Ganesha:
> >> >
> >> > http://www.tuxera.com/community/posix-test-suite/
> >> >
> >> > On NFS v4, one of the issues it tripped over was execute only files.
> >> > Apparently the Linux v4 client doesn't make ACCESS calls in
> >> > conjunction with an open system call, with the result that you can
> >> > open an execute only file (per RFC 3530bis, the server is allowing
> >> > such to allow clients to execute executables).
> >>
> >> That information is outdated. A wireshark dump should show that
> >> recent Linux kernels include an ACCESS operation as part of the
> >> open() COMPOUND and that it uses that information to distinguish
> >> between executable and read access permissions.
> >
> > Oh, cool, do you know when that went in? I'll go look and see if I can find
> it...
> >
> 
> It should be a feature of Linux 3.7 (Dec 2012) and newer kernels.
> 
> Cheers
>   Trond
> 
> --
> Trond Myklebust
> 
> Linux NFS client maintainer, PrimaryData
> 
> trond.myklebust@primarydata.com
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