Re: cannot access pass device from within jail

From: Dan Langille <dan_at_langille.org>
Date: Sun, 17 Dec 2017 15:45:45 -0500
> On Dec 17, 2017, at 3:37 PM, Bjoern A. Zeeb <bzeeb-lists_at_lists.zabbadoz.net> wrote:
> 
> 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_at_: 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?


On the host: 

$ sysctl kern.securelevel
kern.securelevel: -1


On the jail:

$ sysctl kern.securelevel
kern.securelevel: -1

Thank you
-- 
Dan Langille - BSDCan / PGCon
dan_at_langille.org
Received on Sun Dec 17 2017 - 19:46:26 UTC

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