Bug 1460715

Summary: SELinux is preventing /usr/libexec/abrt-hook-ccpp from connectto access on the unix_stream_socket /run/nscd/socket.
Product: Red Hat Enterprise Linux 7 Reporter: Andreas Luik <andreas.luik>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.3CC: andreas.luik, jan.iven, lvrabec, marc.jadoul, mgrepl, mmalik, pasik, plautrba, pvrabec, ssekidde
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-220.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-10-30 10:00:43 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Andreas Luik 2017-06-12 13:33:59 UTC
Description of problem:

SELinux is preventing /usr/libexec/abrt-hook-ccpp from connectto access on the unix_stream_socket /run/nscd/socket.  This happens on a system with nscd.service installed and running.

Raw Audit Messages
type=AVC msg=audit(1496827415.133:867311): avc:  denied  { connectto } for  pid=32425 comm="abrt-hook-ccpp" path="/run/nscd/socket" scontext=system_u:system_r:abrt_dump_oops_t:s0 tcontext=system_u:system_r:nscd_t:s0 tclass=unix_stream_socket


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

selinux-policy-3.13.1-102.el7.noarch
abrt-addon-ccpp-2.1.11-45.el7.x86_64
nscd-2.17-157.el7.x86_64

How reproducible: always


Steps to Reproduce:
1. on RHEL 7.3 system with nscd installed and enabled
2. wait until program crashes and abrt-hook-ccpp is triggered
3. observe AVC message

Comment 3 Marc Jadoul 2018-05-21 17:55:02 UTC
Hello,
I see this also regularly in logs on a Redhat 7.5. Wondering the reason and if this is a problem.... ?
Marc

Comment 8 Milos Malik 2018-09-25 09:52:45 UTC
RHEL-7.6 selinux-policy now contains following rule:

   dontaudit abrt_dump_oops_t nscd_t : unix_stream_socket connectto ; 

which means that communication between abrt-hook-ccpp and nscd through the /run/nscd/socket is impossible, because a similar allow rule is not present.

If the reporter wanted to silence the SELinux denial then the fix is OK.
If the reporter wanted to make the communication possible then the fix is wrong.

Comment 9 Andreas Luik 2018-09-25 11:38:03 UTC
I assume that it is not neccessary to allow abrt-hook-ccpp to communicate to nscd, because (hopefully) it will fall back to regular (non-cached) name service lookup if nscd-based lookup fails.  (Maybe you can double-check with the glibc experts, just to be sure?)

So, if my assumption above is correct, it is sufficient to suppress the SElinux denial message with abovementioned fix.

Comment 12 errata-xmlrpc 2018-10-30 10:00:43 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/RHBA-2018:3111