Re: [PATCH 0/2] nfsd/nfsdctl: default to starting with v4.0 servers disabled

[salvatore.bonaccorso@gmail.com]

Hi Jeff,

On Sun, Mar 22, 2026 at 05:42:29PM -0400, Jeff Layton wrote:
> On Sun, 2026-03-22 at 22:31 +0100, Salvatore Bonaccorso wrote:
> > Hi Steve, Jeff,
> > 
> > On Sun, Mar 22, 2026 at 04:30:02PM -0400, Steve Dickson wrote:
> > > 
> > > 
> > > On 10/8/25 4:13 PM, Jeff Layton wrote:
> > > > At this week's NFS Bakeathon, we had a discussion around deprecating the
> > > > NFSv4.0 protocol. To prepare for that eventuality, make the NFS server
> > > > only accept NFSv4.0 if it was explicitly requested in the config file or
> > > > in command-line options.
> > > > 
> > > > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > > > ---
> > > > Jeff Layton (2):
> > > >        nfsd: disable v4.0 by default
> > > >        nfsdctl: disable v4.0 by default
> > > > 
> > > >   utils/nfsd/nfsd.c       | 5 +++--
> > > >   utils/nfsdctl/nfsdctl.c | 2 +-
> > > >   2 files changed, 4 insertions(+), 3 deletions(-)
> > > > ---
> > > > base-commit: 612e407c46b848932c32be00b835a7b5317e3d08
> > > > change-id: 20251008-master-724587cca99a
> > > > 
> > > > Best regards,
> > > Committed... (tag: nfs-utils-2-9-1-rc1)
> > > 
> > > My apologies for taking so long... The CVE
> > > took longer than expected and there was
> > > some issues with recent patches,
> > > which caused another release..
> > > 
> > > Turning off a protocol version (v4.0)
> > > on the server by default which this rc
> > > release does, is not a small thing
> > > although with the 7.X kernels the
> > > v4.0 client is already off.
> > 
> > I have one small followup question on that. The nfs.conf reads:
> > 
> > [nfsd]
> > # debug=0
> > # threads=16
> > # host=
> > # port=0
> > # grace-time=90
> > # lease-time=90
> > # udp=n
> > # tcp=y
> > # vers3=y
> > # vers4=y
> > # vers4.0=y
> > # vers4.1=y
> > # vers4.2=y
> > [...]
> > 
> > Should the 'default off' change as well be reflected in the commented
> > entry for vers4.0 and read vers4.0=n for consistency?
> > 
> 
> Yes, good catch. Would you mind spinning up a patch? If not, I'll do
> one in the near future.

Thanks for confirming, yes happy to provide a patch for that, will
send it later the day.

Regards,
Salvatore