PERFORCE change 20710 for review

[Robert Watson]

http://perforce.freebsd.org/chv.cgi?CH=20710

Change 20710 by rwatson at rwatson_tislabs on 2002/11/05 10:30:43

	Disallow changing Biba label elements via mac_exec(), since we
	currently don't have the machinery in place for that in Biba.

Affected files ...

.. //depot/projects/trustedbsd/mac/sys/security/mac_biba/mac_biba.c#181 edit

Differences ...

==== //depot/projects/trustedbsd/mac/sys/security/mac_biba/mac_biba.c#181 (text+ko) ====

@@ -2047,7 +2047,20 @@
     struct label *label, struct image_params *imgp,
     struct label *execlabel)
 {
-	struct mac_biba *subj, *obj;
+	struct mac_biba *subj, *obj, *exec;
+	int error;
+
+	if (execlabel != NULL) {
+		/*
+		 * We currently don't permit labels to be changed at
+		 * exec-time as part of Biba, so disallow non-NULL
+		 * Biba label elements in the execlabel.
+		 */
+		exec = SLOT(execlabel);
+		error = biba_atmostflags(exec, 0);
+		if (error)
+			return (error);
+	}
 
 	if (!mac_biba_enabled)
 		return (0);
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