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Bug 1483550

Summary: avc denial when changing smp_affinity_list
Product: Red Hat Enterprise Linux 7 Reporter: Jan Tluka <jtluka>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: high Docs Contact:
Priority: high    
Version: 7.4-AltCC: bugproxy, fnovak, hannsj_uhl, lvrabec, mgrepl, mmalik, osabart, plautrba, pvrabec, ssekidde
Target Milestone: rcKeywords: Patch, TestBlocker
Target Release: 7.4-Alt   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1483670 1485909 (view as bug list) Environment:
Last Closed: 2017-11-09 11:35:18 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1440030, 1485909    

Description Jan Tluka 2017-08-21 11:42:45 UTC 
Description of problem:

I'm getting a SELinux denial when my test script runs:

echo 0 > /proc/irq/em1/smp_affinity_list

or using tuna:

tuna --irqs=31 --cpus=0 --move


The audit.log shows:

time->Fri Aug 18 17:42:37 2017
type=PROCTITLE msg=audit(1503092557.985:76): proctitle=2F62696E2F7368002D63006563686F20223022203E2F70726F632F6972712F35382F736D705F616666696E6974795F6C697374
type=SYSCALL msg=audit(1503092557.985:76): arch=c000003e syscall=2 success=yes exit=3 a0=ec9d40 a1=241 a2=1b6 a3=0 items=0 ppid=14390 pid=22048 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="sh" exe="/usr/bin/bash" subj=system_u:system_r:unconfined_service_t:s0 key=(null)
type=AVC msg=audit(1503092557.985:76): avc:  denied  { associate } for  pid=22048 comm="sh" name="smp_affinity_list" scontext=system_u:object_r:sysctl_irq_t:s0 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem permissive=0


Version-Release number of selected component (if applicable):

[root@localhost ~]# rpm -qa selinux-policy
selinux-policy-3.13.1-166.el7.noarch
[root@localhost ~]# rpm -qa selinux-policy-targeted
selinux-policy-targeted-3.13.1-166.el7.noarch


How reproducible:
Everytime I write to smp_affinity_list

Steps to Reproduce:
1. write to smp_affinity_list
2.
3.

Actual results:
AVC denial

Expected results:
no denial

Additional info:

This ran fine on RHEL-7.4
Comment 2 Milos Malik 2017-08-21 11:57:50 UTC 
Following SELinux denial appeared in enforcing mode:
----
type=PROCTITLE msg=audit(08/21/2017 07:55:50.160:286) : proctitle=/usr/bin/python /usr/bin/tuna --irqs=28 --cpus=0 --move 
type=SYSCALL msg=audit(08/21/2017 07:55:50.160:286) : arch=x86_64 syscall=open success=yes exit=3 a0=0x1441770 a1=O_WRONLY|O_CREAT|O_TRUNC a2=0666 a3=0x24 items=0 ppid=9447 pid=9491 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=2 comm=tuna exe=/usr/bin/python2.7 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(08/21/2017 07:55:50.160:286) : avc:  denied  { associate } for  pid=9491 comm=tuna name=smp_affinity scontext=unconfined_u:object_r:sysctl_irq_t:s0 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem permissive=0 
----

The same command executed in permissive mode triggered following SELinux denial:
----
type=PROCTITLE msg=audit(08/21/2017 07:56:54.840:288) : proctitle=/usr/bin/python /usr/bin/tuna --irqs=28 --cpus=0 --move 
type=SYSCALL msg=audit(08/21/2017 07:56:54.840:288) : arch=x86_64 syscall=open success=yes exit=3 a0=0x2346770 a1=O_WRONLY|O_CREAT|O_TRUNC a2=0666 a3=0x24 items=0 ppid=9447 pid=9495 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=2 comm=tuna exe=/usr/bin/python2.7 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(08/21/2017 07:56:54.840:288) : avc:  denied  { associate } for  pid=9495 comm=tuna name=smp_affinity scontext=unconfined_u:object_r:sysctl_irq_t:s0 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem permissive=1 
----
Comment 6 errata-xmlrpc 2017-11-09 11:35:18 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:3179