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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

Hello,
I see this also regularly in logs on a Redhat 7.5. Wondering the reason and if this is a problem.... ?
Marc

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.

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.

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