cannot access pass device from within jail

[Bjoern A. Zeeb]

On 17 Dec 2017, at 19:52, 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


You don’t by any chance have a securelevel > 1 set for that jail?

/bz