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Bug 1581613

Summary:	avc: denied { read } for pid=89057 comm="ebtables" name="ebtables.lock" dev="tmpfs"
Product:	Red Hat Enterprise Linux 7	Reporter:	redhat-airlock
Component:	selinux-policy	Assignee:	Lukas Vrabec <lvrabec>
Status:	CLOSED DUPLICATE	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.5	CC:	lvrabec, mgrepl, mmalik, plautrba, redhat-airlock, ssekidde
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-05-23 13:50:04 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:

Description redhat-airlock 2018-05-23 08:43:25 UTC

I see following deny message in /var/log/audit/audit.log after installation + yum update

type=AVC msg=audit(1527052327.648:86899): avc:  denied  { read } for  pid=89057 comm="ebtables" name="ebtables.lock" dev="tmpfs" ino=6913013 scontext=system_u:system_r:iptables_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_run_t:s0 tclass=file


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

selinux-policy-3.13.1-192.el7_5.3.noarch.rpm

Comment 2 Milos Malik 2018-05-23 08:50:23 UTC

Could you run following commands and copy&paste their output here?

# find /run -inum 6913013
# ls -Z `find /run -inum 6913013`

I believe the ebtables.lock is located in /run and is mislabeled:

# matchpathcon /run/ebtables.lock
/run/ebtables.lock	system_u:object_r:iptables_var_run_t:s0
#

If my assumption is correct, following command should fix the problem:

# restorecon -v /run/ebtables.lock

Comment 3 redhat-airlock 2018-05-23 09:19:51 UTC

Oh, we created a custom policy in 7.4 for this file:
==
# Allow ebtables to remove /var/run/ebtables.lock
delete_files_pattern(iptables_t, var_run_t, var_run_t);
==

Output looks like this:
==
root@lesbos:~[13] # find /run -inum 6913013 -ls                                                                                                                                                                 
6913013    0 -rw-------   1 root     root            0 May 23 07:12 /run/ebtables.lock                                                                                                                          
root@lesbos:~[14] # ls -Z `find /run -inum 6913013`                                                                                                                                                             
-rw-------. root root system_u:object_r:var_run_t:s0   /run/ebtables.lock                                                                                                                                       
root@lesbos:~[15] # matchpathcon /run/ebtables.lock                                                                                                                                                             
/run/ebtables.lock      system_u:object_r:var_run_t:s0                                                                                                                                                          
root@lesbos:~[16] # restorecon -v /run/ebtables.lock                                                                                                                                                            
root@lesbos:~[17] #   
==

I'll try to reproduce it without our custom labeling and use the default "iptables_var_run_t"

Comment 4 redhat-airlock 2018-05-23 13:19:29 UTC

I've tested the setup without our custom label. The file gets the same permissions.

root@lesbos:audit[26] # ll -Z /run/ebtables.lock 
-rw-------. root root system_u:object_r:var_run_t:s0   /run/ebtables.lock


Is this another variant of https://access.redhat.com/solutions/2625731 ?

Comment 5 Milos Malik 2018-05-23 13:46:55 UTC

I believe it is a duplicate of https://bugzilla.redhat.com/show_bug.cgi?id=1511437

Comment 6 Lukas Vrabec 2018-05-23 13:50:04 UTC


*** This bug has been marked as a duplicate of bug 1511437 ***