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From:   Anna Schumaker <anna.schumaker@netapp.com>
Date:   Fri, 12 Mar 2021 10:42:56 -0500
Message-ID: <CAFX2JfmcCSKViTQjpw4Shw_3QjG_Bizp02ECOQkxN-zGCPUpkg@mail.gmail.com>
Subject: Re: [PATCH] NFSv4.2: fix return value of _nfs4_get_security_label()
To:     Ondrej Mosnacek <omosnace@redhat.com>
Cc:     linux-nfs <linux-nfs@vger.kernel.org>,
        Trond Myklebust <trond.myklebust@hammerspace.com>,
        Linux Security Module list 
        <linux-security-module@vger.kernel.org>,
        SElinux list <selinux@vger.kernel.org>,
        David Quigley <dpquigl@davequigley.com>
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Hi Ondrej,

On Tue, Mar 9, 2021 at 5:10 AM Ondrej Mosnacek <omosnace@redhat.com> wrote:
>
> On Fri, Jan 15, 2021 at 6:43 PM Ondrej Mosnacek <omosnace@redhat.com> wrote:
> > An xattr 'get' handler is expected to return the length of the value on
> > success, yet _nfs4_get_security_label() (and consequently also
> > nfs4_xattr_get_nfs4_label(), which is used as an xattr handler) returns
> > just 0 on success.
> >
> > Fix this by returning label.len instead, which contains the length of
> > the result.
> >
> > Fixes: aa9c2669626c ("NFS: Client implementation of Labeled-NFS")
> > Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
> > ---
> >  fs/nfs/nfs4proc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> > index 2f4679a62712a..28465d8aada64 100644
> > --- a/fs/nfs/nfs4proc.c
> > +++ b/fs/nfs/nfs4proc.c
> > @@ -5971,7 +5971,7 @@ static int _nfs4_get_security_label(struct inode *inode, void *buf,
> >                 return ret;
> >         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
> >                 return -ENOENT;
> > -       return 0;
> > +       return label.len;
> >  }
> >
> >  static int nfs4_get_security_label(struct inode *inode, void *buf,
> > --
> > 2.29.2
> >
>
> Ping. It's been almost 2 months now, and I can't see the patch applied
> anywhere, nor has it received any feedback from the NFS maintainers...
> Trond? Anna?

Thanks for the ping! I've queued this up for the next bugfixes pull request.

Anna
>
> --
> Ondrej Mosnacek
> Software Engineer, Linux Security - SELinux kernel
> Red Hat, Inc.
>