Date: Thu, 16 Feb 2006 11:12:59 GMT From: Andrew Hacking <ahacking@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/93423: Applying devfs rulset fails Message-ID: <200602161112.k1GBCxXh040804@www.freebsd.org> Resent-Message-ID: <200602161120.k1GBKArT027964@freefall.freebsd.org>
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>Number: 93423
>Category: kern
>Synopsis: Applying devfs rulset fails
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Feb 16 11:20:09 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Andrew Hacking
>Release: 6.0-RELEASE-p4
>Organization:
>Environment:
FreeBSD home.inet 6.0-RELEASE-p4 FreeBSD 6.0-RELEASE-p4 #1: Wed Feb 15 10:50:20 EST 2006 root@home.inet:/usr/obj/usr/src/sys/DELL4100 i386
>Description:
It is currently not possible (for me at least) to setup a secure jail by adding devfs rules. Also devfs commands can leave the system in a state where it is not possible to shutdown cleanly.
On attempting to setup devfs for a jail, the following devfs command fails:
# mount_devfs devfs /jail/foo/dev
# devfs -m /jail/foo/dev rule -s 4 applyset
devfs rule: ioctl DEVFSIO_SAPPLY: No such process
[Note: rule-set doesn't get applied]
Also, trying to apply rules manually hangs and never returns, leaving the process blocked in disk (D) wait state.
Shutting down the system also never completes and requires a power cycle and (at least for me) required manual fsck of most file-systems on reboot.
This could potentially be related to the problem described in:
http://lists.freebsd.org/pipermail/freebsd-hackers/2006-January/015009.html
My revision of /usr/src/sys/fs/devfs_rule.c is:
$FreeBSD: src/sys/fs/devfs/devfs_rule.c,v 1.14.2.2 2005/09/26 14:36:52 phk Exp $
I will try revision listed in above email and report back....
>How-To-Repeat:
# mkdir /tmp/foodev
# mount_devfs devfs /tmp/foodev
# devfs -m /tmp/foodev rule -s4 applyset
devfs rule: ioctl DEVFSIO_SAPPLY: No such process
[Note: rule-set doesn't get applied]
Now try adding rules manually to trigger process hang:
# devfs -m /tmp/foodev rule add hide
# devfs -m /tmp/foodev rule add path null unhide
.. etc ...
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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