[AUDIT] add session id to audit messages

In order to correlate audit records to an individual login add a session
id.  This is incremented every time a user logs in and is included in
almost all messages which currently output the auid.  The field is
labeled ses=  or oses=

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index bee9694..0341567 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -172,9 +172,10 @@
 		if (length)
 			goto out;
 		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
-			"enforcing=%d old_enforcing=%d auid=%u", new_value, 
-			selinux_enforcing,
-			audit_get_loginuid(current));
+			"enforcing=%d old_enforcing=%d auid=%u ses=%u",
+			new_value, selinux_enforcing,
+			audit_get_loginuid(current),
+			audit_get_sessionid(current));
 		selinux_enforcing = new_value;
 		if (selinux_enforcing)
 			avc_ss_reset(0);
@@ -243,8 +244,9 @@
 		if (length < 0)
 			goto out;
 		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
-			"selinux=0 auid=%u",
-			audit_get_loginuid(current));
+			"selinux=0 auid=%u ses=%u",
+			audit_get_loginuid(current),
+			audit_get_sessionid(current));
 	}
 
 	length = count;
@@ -356,8 +358,9 @@
 		(security_get_allow_unknown() ? "allow" : "deny")));
 
 	audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
-		"policy loaded auid=%u",
-		audit_get_loginuid(current));
+		"policy loaded auid=%u ses=%u",
+		audit_get_loginuid(current),
+		audit_get_sessionid(current));
 out:
 	mutex_unlock(&sel_mutex);
 	vfree(data);