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Bug 715274

Summary: user_t can't lower audio volume
Product: Red Hat Enterprise Linux 6 Reporter: Michael Mráka <mmraka>
Component: selinux-policyAssignee: Miroslav Grepl <mgrepl>
Status: CLOSED CANTFIX QA Contact: BaseOS QE Security Team <qe-baseos-security>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.1CC: dwalsh
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-06-22 13:54:58 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Michael Mráka 2011-06-22 12:01:29 UTC
Description of problem:
a user mapped to user_t can't lower/raise audio volume

Version-Release number of selected component (if applicable):
metacity-2.28.0-20.el6
gnome-media-2.29.91-6.el6
selinux-policy-3.7.19-93.el6

How reproducible:
always

Steps to Reproduce:
1. map a user to user_t
2. login as the user
3. press a key mapped to XF86AudioLowerVolume /  XF86AudioRaiseVolume
4. see AVC denial


Summary:

SELinux is preventing /usr/bin/metacity "connectto" access on
/tmp/pulse-SyvR3tdk08Ao/native.

Detailed Description:

SELinux denied access requested by metacity. It is not expected that this access
is required by metacity and this access may signal an intrusion attempt. It is
also possible that the specific version or configuration of the application is
causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://docs.fedoraproject.org/selinux-faq-fc5/#id2961385) Please file a bug
report.

Additional Information:

Source Context                user_u:user_r:user_t:s0
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                /tmp/pulse-SyvR3tdk08Ao/native [
                              unix_stream_socket ]
Source                        gconfd-2
Source Path                   /usr/libexec/gconfd-2
Port                          <Unknown>
Host                          <Unknown>
Source RPM Packages           metacity-2.28.0-20.el6
Target RPM Packages           
Policy RPM                    selinux-policy-3.7.19-93.el6
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     xxx
Platform                      Linux xxx
                              2.6.32-131.4.1.el6.i686 #1 SMP Fri Jun 10 10:53:52
                              EDT 2011 i686 i686
Alert Count                   37
First Seen                    Thu Jun 16 22:37:53 2011
Last Seen                     Thu Jun 16 22:41:17 2011
Local ID                      9059efba-ee9b-4d0f-af4e-5f5d4948854c
Line Numbers                  4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
                              18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
                              30, 31, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
                              46, 47, 48, 49, 53, 54, 55, 56, 57, 58, 59, 60,
                              61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72,
                              77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88

Raw Audit Messages            

type=AVC msg=audit(1308256877.977:203): avc:  denied  { connectto } for  pid=11887 comm="metacity" path="/tmp/pulse-SyvR3tdk08Ao/native" scontext=user_u:user_r:user_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=unix_stream_socket

type=SYSCALL msg=audit(1308256877.977:203): arch=40000003 syscall=102 success=no exit=-13 a0=3 a1=bfd8fbe0 a2=39a1400 a3=92c7040 items=0 ppid=11771 pid=11887 auid=600 uid=600 gid=600 euid=600 suid=600 fsuid=600 egid=600 sgid=600 fsgid=600 tty=(none) ses=22 comm="metacity" exe="/usr/bin/metacity" subj=user_u:user_r:user_t:s0 key=(null)

Comment 2 Miroslav Grepl 2011-06-22 13:13:21 UTC
Well, this is a problem if a user switches from unconfined to confined SELinux user.

Comment 3 Daniel Walsh 2011-06-22 13:54:58 UTC
You would need to clean out the /tmp directory if you are running with confined users.  This is one of the reasons I always run with a tmpfs /tmp/

rm -rf /tmp/pulse-* 
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