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Bug 1026078 - SELinux prevents varnishd from searching in /sys/devices/system/cpu directory
Summary: SELinux prevents varnishd from searching in /sys/devices/system/cpu directory
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: selinux-policy
Version: 6.5
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Milos Malik
URL:
Whiteboard:
: 1025315 1026077 1083105 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-11-03 12:59 UTC by Milos Malik
Modified: 2014-10-14 07:57 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-10-14 07:57:47 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2014:1568 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2014-10-14 01:27:37 UTC

Description Milos Malik 2013-11-03 12:59:38 UTC 
Description of problem:


Version-Release number of selected component (if applicable):
selinux-policy-3.7.19-231.el6.noarch
selinux-policy-doc-3.7.19-231.el6.noarch
selinux-policy-minimum-3.7.19-231.el6.noarch
selinux-policy-mls-3.7.19-231.el6.noarch
selinux-policy-targeted-3.7.19-231.el6.noarch
varnish-2.1.5-1.el6.x86_64
varnish-libs-2.1.5-1.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. get a RHEL-6.5 machine where targeted policy is active
2. service varnish start
3. search for AVCs

Actual results:
----
type=PATH msg=audit(11/03/2013 13:57:21.124:651) : item=0 name=/sys/devices/system/cpu/online inode=1 dev=00:00 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sysfs_t:s0 nametype=NORMAL 
type=CWD msg=audit(11/03/2013 13:57:21.124:651) :  cwd=/ 
type=SYSCALL msg=audit(11/03/2013 13:57:21.124:651) : arch=x86_64 syscall=open success=no exit=-13(Permission denied) a0=3f1b1592b8 a1=80000 a2=1fffe98a4167 a3=1 items=1 ppid=7681 pid=7682 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=9 comm=varnishd exe=/usr/sbin/varnishd subj=unconfined_u:system_r:varnishd_t:s0 key=(null) 
type=AVC msg=audit(11/03/2013 13:57:21.124:651) : avc:  denied  { search } for  pid=7682 comm=varnishd name=/ dev=sysfs ino=1 scontext=unconfined_u:system_r:varnishd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=dir 
----

Expected results:
 * no AVCs
Comment 1 Milos Malik 2013-11-03 13:01:48 UTC 
Actual results (permissive mode):
----
type=PATH msg=audit(11/03/2013 13:59:52.622:653) : item=0 name=/sys/devices/system/cpu/online inode=23 dev=00:00 mode=file,444 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sysfs_t:s0 nametype=NORMAL 
type=CWD msg=audit(11/03/2013 13:59:52.622:653) :  cwd=/ 
type=SYSCALL msg=audit(11/03/2013 13:59:52.622:653) : arch=x86_64 syscall=open success=yes exit=3 a0=3f1b1592b8 a1=80000 a2=1fffe51561af a3=1 items=1 ppid=7761 pid=7762 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=9 comm=varnishd exe=/usr/sbin/varnishd subj=unconfined_u:system_r:varnishd_t:s0 key=(null) 
type=AVC msg=audit(11/03/2013 13:59:52.622:653) : avc:  denied  { open } for  pid=7762 comm=varnishd name=online dev=sysfs ino=23 scontext=unconfined_u:system_r:varnishd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=file 
type=AVC msg=audit(11/03/2013 13:59:52.622:653) : avc:  denied  { read } for  pid=7762 comm=varnishd name=online dev=sysfs ino=23 scontext=unconfined_u:system_r:varnishd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=file 
type=AVC msg=audit(11/03/2013 13:59:52.622:653) : avc:  denied  { search } for  pid=7762 comm=varnishd name=/ dev=sysfs ino=1 scontext=unconfined_u:system_r:varnishd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=dir 
----
Comment 2 Daniel Walsh 2013-11-04 17:06:47 UTC 
I think there is a new glibc?  Causing all confiend apps to read the cpu file. Maybe we should dontaudit it.  Not sure if what valuable information might be under /sys.
Comment 3 Miroslav Grepl 2013-11-05 13:14:26 UTC 
*** Bug 1026077 has been marked as a duplicate of this bug. ***
Comment 4 Miroslav Grepl 2013-12-13 08:16:44 UTC 
*** Bug 1025315 has been marked as a duplicate of this bug. ***
Comment 5 adruch2002 2014-02-20 23:27:46 UTC 
I know the status is still NEW but has this been considered any further? Is dontaudit the right answer? I'm seeing it on other apps besides varnishd.
Comment 6 Daniel Walsh 2014-02-21 21:33:41 UTC 
Could you attach the AVC's you are seeing?
Comment 7 adruch2002 2014-02-22 02:59:33 UTC 
Below is one of the AVC's. The subject 'scmonitor_t' if from a custom domain I have monitoring the state of some other processes. This is why I was generically asking if you planned to allow or dontaudit. I'll need to implement something for my own policy and was hoping to learn from what you decide here.

----
type=PATH msg=audit(02/22/2014 01:40:00.280:470) : item=0 name=/sys/devices/system/cpu/online inode=1 dev=00:00 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sysfs_t:s0 nametype=NORMAL 
type=CWD msg=audit(02/22/2014 01:40:00.280:470) :  cwd=/ 
type=SYSCALL msg=audit(02/22/2014 01:40:00.280:470) : arch=x86_64 syscall=open success=no exit=-13(Permission denied) a0=7f09d7ba22b8 a1=80000 a2=ffffffffffffffff a3=7fff2e1c25d0 items=1 ppid=1906 pid=2428 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=pgrep exe=/usr/bin/pgrep subj=system_u:system_r:scmonitor_t:s0 key=(null) 
type=AVC msg=audit(02/22/2014 01:40:00.280:470) : avc:  denied  { search } for  pid=2428 comm=pgrep name=/ dev=sysfs ino=1 scontext=system_u:system_r:scmonitor_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=dir
Comment 8 Daniel Walsh 2014-02-24 21:36:51 UTC 
Most likely the app needs to read something in /sys so I would probably allow, it depends on if there is a piece of information that you believe this process should not be allowed to sys.  Basically this allows the app to search through /sys.


Not very dangerous.
Comment 9 Miroslav Grepl 2014-04-01 17:01:34 UTC 
*** Bug 1083105 has been marked as a duplicate of this bug. ***
Comment 11 errata-xmlrpc 2014-10-14 07:57:47 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.

http://rhn.redhat.com/errata/RHBA-2014-1568.html
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