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Date:      Sat, 11 Mar 2017 15:35:06 +0200
From:      Alnis Morics <alnis.moritz@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Jail limited user cannot access host mountpoint although jail root can
Message-ID:  <e98ded48-119c-7d01-19e7-fd56f5ee0d33@gmail.com>
In-Reply-To: <E-Pk5T6KVYVcLFjKCsIMYXQMACoEuRThVEEdqMPZSx21aa@mailpile>
References:  <E-Pk5T6KVYVcLFjKCsIMYXQMACoEuRThVEEdqMPZSx21aa@mailpile>

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On 03/11/2017 04:59, DaLynX via freebsd-questions wrote:
> Hello,
>
> I am trying to make my setup work with jails and got stuck in the
> following situation:
>
> - Host is mounting a fuse filesystem (because I couldn't make it work directly inside the jail - although the /dev/fuse device was accessible) in the jail's chroot.
> - From root@host, everything looks fine.
> - root@jail, too, can access the mounted filesystem, read files, no problem.
> - limited@jail can see the mountpoints but cannot access them in any way (no cd, no ls...) although the file permissions look okay (it's all 755, and for some reason limited is the owner of all mountpoints).
>
> What could have gone wrong? I tried playing around with
> vfs.usermount on the host or enforce_statfs on the jail but it
> makes no difference.
>
> Any pointers would be greatly appreciated.
>
> Kind regards,
> DaLynX

Why not use mount_nullfs(8)? Like:

mount_nullfs <directory_on_host> /usr/jails/<jailname>/<dir_on_jail>

-Alnis



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