Bug 737526

Summary: SELinux is preventing /usr/sbin/tgtd "search" access on /sys.
Product: Red Hat Enterprise Linux 6 Reporter: Omkar <omkarlagu>
Component: selinux-policyAssignee: Miroslav Grepl <mgrepl>
Status: CLOSED NEXTRELEASE QA Contact: Milos Malik <mmalik>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 6.0CC: dwalsh, mmalik, omkarlagu
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-09-13 05:45:36 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Omkar 2011-09-12 12:42:01 UTC 
--------------------------------------------------------------------------------


Summary:

SELinux is preventing /usr/sbin/tgtd "search" access on /sys.

Detailed Description:

SELinux denied access requested by tgtd. It is not expected that this access is
required by tgtd 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                system_u:system_r:tgtd_t:s0
Target Context                system_u:object_r:sysfs_t:s0
Target Objects                /sys [ dir ]
Source                        tgtd
Source Path                   /usr/sbin/tgtd
Port                          <Unknown>
Host                          <Unknown>
Source RPM Packages           scsi-target-utils-1.0.4-3.el6
Target RPM Packages           filesystem-2.4.30-2.1.el6
Policy RPM                    selinux-policy-3.7.19-54.el6
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     punb200m2labs04vm5
Platform                      Linux punb200m2labs04vm5 2.6.32-71.el6.x86_64 #1
                              SMP Wed Sep 1 01:33:01 EDT 2010 x86_64 x86_64
Alert Count                   3
First Seen                    Tue Sep 13 03:34:03 2011
Last Seen                     Tue Sep 13 03:34:03 2011
Local ID                      a21ac4d1-3221-4f3c-9100-ae706358cb10
Line Numbers                  8418, 8419, 8420, 8421, 8422, 8423

Raw Audit Messages            

type=AVC msg=audit(1315865043.544:81306): avc:  denied  { search } for  pid=8212 comm="tgtd" name="/" dev=sysfs ino=1 scontext=system_u:system_r:tgtd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=dir

type=SYSCALL msg=audit(1315865043.544:81306): arch=c000003e syscall=2 success=no exit=-13 a0=25fd490 a1=0 a2=0 a3=737265765f696261 items=0 ppid=8211 pid=8212 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="tgtd" exe="/usr/sbin/tgtd" subj=system_u:system_r:tgtd_t:s0 key=(null)



Additional info:

[root@punb200m2labs02vm6 conf]# cat /etc/issue
Red Hat Enterprise Linux Server release 6.0 (Santiago)
Kernel \r on an \m

[root@punb200m2labs02vm6 conf]# uname -a
Linux punb200m2labs02vm6 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1 01:33:01 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux


[root@punb200m2labs02vm6 conf]# rpm -qa | grep selinux
selinux-policy-3.7.19-54.el6.noarch
selinux-policy-targeted-3.7.19-54.el6.noarch
libselinux-2.0.94-2.el6.i686
libselinux-utils-2.0.94-2.el6.x86_64
libselinux-2.0.94-2.el6.x86_64
libselinux-devel-2.0.94-2.el6.x86_64
libselinux-python-2.0.94-2.el6.x86_64
[root@punb200m2labs02vm6 conf]#
Comment 2 Daniel Walsh 2011-09-12 19:14:09 UTC 
This is allowed in F16 policy.
Comment 3 Miroslav Grepl 2011-09-13 05:45:36 UTC 
And this is also fixed in the latest RHEL6. You can download pre-release from

http://people.redhat.com/dwalsh/SELinux/RHEL6/noarch/
Comment 4 Omkar 2011-09-13 06:45:11 UTC 
Looks like tgtd is creating the file in "/tmp/.TGT_IPC_ABSTRACT_NAMESPACE.0"

</snip>
[root@punb200m2labs04vm5 bin]# /etc/init.d/tgtd status
tgtd is stopped

[root@punb200m2labs04vm5 bin]# ls -l /tmp/.TGT_IPC_ABSTRACT_NAMESPACE.0
ls: cannot access /tmp/.TGT_IPC_ABSTRACT_NAMESPACE.0: No such file or directory

[root@punb200m2labs04vm5 bin]# date
Tue Sep 13 22:57:57 IST 2011

[root@punb200m2labs04vm5 bin]# /etc/init.d/tgtd start
Starting SCSI target daemon:                               [  OK  ]

[root@punb200m2labs04vm5 bin]# ls -l /tmp/.TGT_IPC_ABSTRACT_NAMESPACE.0
srwxr-xr-x. 1 root root 0 Sep 13 22:58 /tmp/.TGT_IPC_ABSTRACT_NAMESPACE.0
</snip>

But interestingly I am not hitting the issue. After removing the file and rebooting the server and again starting /etc/init.d/tgtd start.
I tried one more reboot and start of tgtd, Still cannot hit the issue.
Comment 5 Omkar 2011-09-13 06:47:13 UTC 
Ignore the comment 4. Accidentally updated the incorrect incident. Was meant for incident 737527.