cannot access pass device from within jail

[Konstantin Belousov]

On Sun, Dec 17, 2017 at 02:52:12PM -0500, Dan Langille wrote:
> Hello,
> 
> What suggestions do you have for where I should look next? I'm happy to start installing various builds of FreeBSD in order to track down which commit caused this.
> 
> I'm trying to access a tape library from within a jail running on a FreeBSD 11.1 host.  sa(4) devices are working (e.g. I can rewind nsa0).
> 
> pass(4) devices (i.e. the tape changer ch0) are not working.  This morning I posted to -scsi@: https://lists.freebsd.org/pipermail/freebsd-scsi/2017-December/007608.html
> 
> The device appears in the jail and has appropriate permissions.  This access was granted
> via /etc/devfs.rules using the same approach I used for FreeBSD 10.3
> 
> The permissions in the jail:
> 
> [root at bacula-sd-02 ~]# ls -l /dev/pass7
> crw-------  1 root  operator  0x74 Dec 16 21:52 /dev/pass7
> 
> The command in the jail:
> 
> [root at bacula-sd-02 ~]# mtx -f /dev/pass7 status 
> cannot open SCSI device '/dev/pass7' - Operation not permitted
> 
> Here is the truss output of the command in question: https://gist.github.com/dlangille/b80ee804b8080e1cbf5b5ab67f0bdabe

Does it work to access the pass device from host using host' /dev ?
Same question for the host access using the nodes of the jailed devfs mount.