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Bug 628895 - init script searches cwd which can cause SELinux denials
Summary: init script searches cwd which can cause SELinux denials
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libcgroup
Version: 6.0
Hardware: All
OS: Linux
low
medium
Target Milestone: rc
: ---
Assignee: Ivana Varekova
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On:
Blocks: 672300
TreeView+ depends on / blocked
 
Reported: 2010-08-31 10:23 UTC by Milos Malik
Modified: 2011-05-19 13:13 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-05-19 13:13:14 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2011:0577 0 normal SHIPPED_LIVE libcgroup bug fix and enhancement update 2011-05-18 17:56:57 UTC

Description Milos Malik 2010-08-31 10:23:29 UTC 
Description of problem:
Some administrators don't use "service" command when managing a service. They
still do it this way:
/etc/init.d/SERVICE start
/etc/init.d/SERVICE restart
/etc/init.d/SERVICE stop
This procedure can cause SELinux denials when an administrator issues the
command in unusual location (usual location is for example / or /root ,
selinux-policy is aware of usual locations and SELinux denials are
dontaudited). I would like to ask to fix the init script in such a way that it
does not search for programs in current working directory.

Version-Release number of selected component (if applicable):
libcgroup-0.36.1-6.el6.i686
selinux-policy-3.7.19-42.el6.noarch
selinux-policy-doc-3.7.19-42.el6.noarch
selinux-policy-minimum-3.7.19-42.el6.noarch
selinux-policy-mls-3.7.19-42.el6.noarch
selinux-policy-targeted-3.7.19-42.el6.noarch

How reproducible:
always

Steps to Reproduce:
# cd /var/log/audit
# /etc/init.d/cgconfig start
Starting cgconfig service: Loading configuration file /etc/cgconfig.conf failed
Permission denied
Failed to parse /etc/cgconfig.conf                         [FAILED]
# /etc/init.d/cgconfig stop
Stopping cgconfig service:                                 [  OK  ]
# ausearch -m avc -ts recent
----
time->Tue Aug 31 12:19:25 2010
type=SYSCALL msg=audit(1283249965.670:304): arch=40000003 syscall=12 success=no 
exit=-13 a0=bfc7fbac a1=bfc7fbac a2=76f168 a3=e items=0 ppid=5645 pid=5648 auid=
0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=1 comm="c
gconfigparser" exe="/sbin/cgconfigparser" subj=unconfined_u:system_r:cgconfig_t:
s0 key=(null)
type=AVC msg=audit(1283249965.670:304): avc:  denied  { search } for  pid=5648 comm="cgconfigparser" name="audit" dev=dm-0 ino=9973 scontext=unconfined_u:system_r:cgconfig_t:s0 tcontext=system_u:object_r:auditd_log_t:s0 tclass=dir
----

Actual results:
an AVC appears

Expected results:
no AVC appears

Additional info:
Comment 1 Jan Safranek 2010-08-31 12:36:14 UTC 
cgconfigparser changes current directory to the cgroup mount point (which succeeds), but SELinux does not like when cgconfig tries to change it back to /var/log/audit:

getcwd("/var/log/audit", 4096)          = 15
mkdir("/", 0775)                        = -1 EEXIST (File exists)     (this is OK)
chdir("/")                              = 0
mkdir("cgroup/", 0775)                  = -1 EEXIST (File exists)     (this is OK)
chdir("cgroup/")                        = 0
mkdir("cpuset", 0775)                   = 0
chdir("cpuset")                         = 0
chdir("/var/log/audit")                 = -1 EACCES (Permission denied) (this is WRONG)


cgconfigparser should simply not change current working directory.
Comment 2 Jan Safranek 2010-11-08 12:18:12 UTC 
Patch sent upstream: http://sourceforge.net/mailarchive/message.php?msg_name=20100901123838.29149.28313.stgit%40dhcp-2-160.brq.redhat.com
Comment 4 Mike Gahagan 2011-01-24 16:22:59 UTC 
Confirmed this is fixed in libcgroup-0.37-1.el6.x86_64. service can now be started with /etc/init.d/cgconfig start . Also verified that starting/stopping/restarting still works as expected using /sbin/service.
Comment 5 errata-xmlrpc 2011-05-19 13:13:14 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0577.html
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