On Sat, 15 May 2010, Fernando Lopez-Lezcano wrote:
I you want to try Planet CCRMA you should start by following the
recommendations on how to install it here (maybe you already did?):
http://ccrma.stanford.edu/planetccrma/software/
I was following
http://ccrma.stanford.edu/planetccrma/software/installplaneteleven.html,
which is linked off that page. I got stuck at the point of
enabling the CCRMA repository, when it told me that the meta-package
hadn't been built yet for F12, and I was left to browse the repository for
packages. I was also confused by the presence of two separate
repositories: 'PlanetCCRMA' and 'PlanetCCRMA Core'. ISTR fedora being
called 'fedora core' in the early days, and this led me off into a tangent
trying to learn what the difference is, and which I should be using...
If you start by installing planetccrma-core-* then you should get a
properly configured rt kernel, misc alsa packages that are not installed
by default and optimization software (rtirq). Installing the kernel
alone is not nearly enough.
Looking back thru my command history, I find I have attempted the
following:
yum upgrade
rpm -Uvh http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/12/i386/planetccrma-repo-1.1-2.fc12.ccrma.noarch.rpm
yum install planetccrma-apps /* didn't work */
yum install ardour
yum install jack ffado /* jack not found, but ffado was installed */
yum install planetccrma-core
yum install qjackctl
At this point,I launched qjackctl and attempted to start jack. It asked
me to update limits.conf for the audio group, so I did, and added myself
to the audio group. I rebooted, and tried it again. This time, not only
did jack fail, but qjackctl aborted as well. ps tells me that jack is
still there, zombified....
So here is where I stand now:
[root@angel ~]# yum list installed planetccrma* jack* ardour* ffado*
Loaded plugins: presto, refresh-packagekit
Installed Packages
ardour.i686 2.8.7-1.fc12 @updates
ffado.i686 2.0.0-1.fc12.ccrma @planetccrma
jack-audio-connection-kit.i686 0.118.0-1.fc12 @updates
planetccrma-core.i686 2010.01.21-1.fc12.ccrma @planetcore
planetccrma-repo.noarch 1.1-2.fc12.ccrma installed
Then you should upgrade to the jack package that is part of Planet
CCRMA. This will set up universal access for the realtime schedule (and
you don't need touch anything in /etc/security/*).
OK, I'm running `yum upgrade` which is picking up the newer j-a-c-k as
well as 12 others, including several qt and xorg packages.
Now, trying again. I launch qjackctl. The messsage window pops up and
immediately tells me: 'cannot connect to jack server'. I don't worry too
much, because I haven't yet tried to start jack.
So I push the 'start' button, without first even looking at the defaults
in the 'setup' page. The message window scrolls by a bunch of messages,
and I'm able to see that jackdmp v 1.94 is indeed there. But then it
locks up, and I get an SElinux popup with two errors. The first is from
three days ago, when I was making my first attempts:
Summary:
SELinux is preventing /usr/sbin/abrtd (deleted) "write" access on abrt.
...I don't know how 'abrtd' is related to jack, it may be just
coincidence.
Then the second one, today:
Summary:
SELinux is preventing /usr/bin/jackd from loading
/usr/lib/libffado.so.2.0.0
which requires text relocation.
Detailed Description:
The jackd application attempted to load /usr/lib/libffado.so.2.0.0 which
requires text relocation. This is a potential security problem. Most
libraries
do not need this permission. Libraries are sometimes coded incorrectly and
request this permission. The SELinux Memory Protection Tests
(http://people.redhat.com/drepper/selinux-mem.html) web page explains how
to
remove this requirement. You can configure SELinux temporarily to allow
/usr/lib/libffado.so.2.0.0 to use relocation as a workaround, until the
library
is fixed. Please file a bug report.
Allowing Access:
If you trust /usr/lib/libffado.so.2.0.0 to run correctly, you can change
the
file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/usr/lib/libffado.so.2.0.0'" You must also change the default file
context
files on the system in order to preserve them even on a full relabel.
"semanage
fcontext -a -t textrel_shlib_t '/usr/lib/libffado.so.2.0.0'"
Fix Command:
chcon -t textrel_shlib_t '/usr/lib/libffado.so.2.0.0'
Additional Information:
Source Context
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
023
Target Context system_u:object_r:lib_t:s0
Target Objects /usr/lib/libffado.so.2.0.0 [ file ]
Source jackd
Source Path /usr/bin/jackd
Port <Unknown>
Host angel.aapsc.com
Source RPM Packages jack-audio-connection-kit-1.9.4-1.fc12.ccrma
Target RPM Packages libffado-2.0.0-1.fc12.ccrma
Policy RPM selinux-policy-3.6.32-113.fc12
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Plugin Name allow_execmod
Host Name angel.aapsc.com
Platform Linux angel.aapsc.com
2.6.31.12-1.rt20.1.fc12.ccrma.i686.rtPAE #1
SMP
PREEMPT RT Thu Jan 21 22:07:32 EST 2010 i686
athlon
Alert Count 2
First Seen Sun 16 May 2010 02:50:02 PM EDT
Last Seen Sun 16 May 2010 02:50:02 PM EDT
Local ID d2aeb4a1-1065-4d28-87c0-0f573876e08f
Line Numbers
Raw Audit Messages
node=angel.aapsc.com type=AVC msg=audit(1274035802.313:27312): avc:
denied { execmod } for pid=4623 comm="jackd"
path="/usr/lib/libffado.so.2.0.0" dev=dm-0 ino=7903
scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tcontext=system_u:object_r:lib_t:s0 tclass=file
node=angel.aapsc.com type=SYSCALL msg=audit(1274035802.313:27312):
arch=40000003 syscall=125 success=no exit=-13 a0=42d92000 a1=176000 a2=5
a3=bf8e6a00 items=0 ppid=4618 pid=4623 auid=500 uid=500 gid=500 euid=500
suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1
comm="jackd" exe="/usr/bin/jackd"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
...it gives me two commands to use to reconfigure selinux to allow an
exception for libffado, and I copy and paste them into a root console, but
that does not unlock jack or qjackctl. I was able to kill qjackctl, but
jackd is zombified:
[root@angel ~]# ps aux | grep jack
rtg 2156 99.3 0.0 0 0 ? Zsl May14 3186:39 [jackd]
<defunct>
rtg 4623 0.0 0.9 79948 19284 ? DL 14:50 0:00
/usr/bin/jackd -dalsa -dhw:0 -r48000 -p1024 -n2
root 4685 0.0 0.0 4212 712 pts/0 S+ 15:09 0:00 grep jack
...so it looks like my only option at this point is to send off this email
and reboot the system before trying again.
--
Rick Green
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-Benjamin Franklin
"As for our common defense, we reject as false the choice between our
safety and our ideals."
-President Barack Obama 20 Jan 2009
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