SELinux: Add warning messages on network denial due to error

Currently network traffic can be sliently dropped due to non-avc errors which
can lead to much confusion when trying to debug the problem.  This patch adds
warning messages so that when these events occur there is a user visible
notification.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/security/selinux/netnode.c b/security/selinux/netnode.c
index 49c527799240..f3c526f2cacb 100644
--- a/security/selinux/netnode.c
+++ b/security/selinux/netnode.c
@@ -264,8 +264,12 @@ static int sel_netnode_sid_slow(void *addr, u16 family, u32 *sid)
 
 out:
         spin_unlock_bh(&sel_netnode_lock);
-        if (ret != 0)
+        if (unlikely(ret)) {
+                printk(KERN_WARNING
+                       "SELinux: failure in sel_netnode_sid_slow(),"
+                       " unable to determine network node label\n");
                 kfree(new);
+        }
         return ret;
 }