Re: mounting NFS share from the jail

Dnia Sat, Jan 20, 2024 at 07:09:40AM -0800, Rick Macklem napisał(a):
> On Sat, Jan 20, 2024 at 6:48 AM Marek Zarychta
> <zarychtam@plan-b.pwste.edu.pl> wrote:
> >
> > Dear List,
> >
> > there were some efforts to allow running nfsd(8) inside the jail, but is
> > mounting an NFS share from the jail allowed?  Inside the jail
> > "security.jail.mount_allowed" is set to 1, I also added "add path net
> > unhide" to the ruleset in devfs.rules but when trying to mount the NFS
> > share I get only the error:
> >
> > mount_nfs: nmount: /usr/src: Operation not permitted
> >
> > It's not a big deal, the shares can be mounted from the jail host, but I
> > am surprised that one can run NFSD inside the jail while mounting NFS
> > shares is still denied.
> >
> > Am I missing anything or is mounting NFS from inside the jail still
> > unsupported?  The tests were done on the recent stable/14 from the vnet
> > jail.  Any clues h will be appreciated.
> You are correct. Mounting from inside a jail is not supported.
> After doing the vnet conversion for nfsd, I tried doing it for the NFS client.
> There were a moderate # of global variables that needed to be vnet'd,
> which I did.  The hard/messy part was having the threads (anything that
> calls an NFS VFS/VOP call) set to the proper vnet.
> It would have required a massive # of CURVET_SET()/CURVET_RESTORE()
> macros and I decided that it was just too messy.
> 
> If it becomes a necessary feature, it is ugly but doable.
> 
Thank you for the clarification and for giving some insight into the
problem.

Marek Zarychta

> rick
> 
> >
> > Cheers
> >
> > --
> > Marek Zarychta
> >