apparmor: fix policy_compat permission remap with extended permissions

If the extended permission table is present we should not be attempting
to do a compat_permission remap as the compat_permissions are not
stored in the dfa accept states.

Fixes: fd1b2b95a2 ("apparmor: add the ability for policy to specify a permission table")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: Jon Tourville <jontourville@me.com>

security/apparmor/policy_unpack.c

@@ -849,10 +849,12 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
 		}
 		profile->attach.xmatch_len = tmp;
 		profile->attach.xmatch.start[AA_CLASS_XMATCH] = DFA_START;
-		error = aa_compat_map_xmatch(&profile->attach.xmatch);
-		if (error) {
-			info = "failed to convert xmatch permission table";
-			goto fail;
+		if (!profile->attach.xmatch.perms) {
+			error = aa_compat_map_xmatch(&profile->attach.xmatch);
+			if (error) {
+				info = "failed to convert xmatch permission table";
+				goto fail;
+			}
 		}
 	}
 
@@ -972,10 +974,13 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
 				      AA_CLASS_FILE);
 		if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 			goto fail;
-		error = aa_compat_map_policy(&rules->policy, e->version);
-		if (error) {
-			info = "failed to remap policydb permission table";
-			goto fail;
+		if (!rules->policy.perms) {
+			error = aa_compat_map_policy(&rules->policy,
+						     e->version);
+			if (error) {
+				info = "failed to remap policydb permission table";
+				goto fail;
+			}
 		}
 	} else
 		rules->policy.dfa = aa_get_dfa(nulldfa);
@@ -985,10 +990,12 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
 	if (error) {
 		goto fail;
 	} else if (rules->file.dfa) {
-		error = aa_compat_map_file(&rules->file);
-		if (error) {
-			info = "failed to remap file permission table";
-			goto fail;
+		if (!rules->file.perms) {
+			error = aa_compat_map_file(&rules->file);
+			if (error) {
+				info = "failed to remap file permission table";
+				goto fail;
+			}
 		}
 	} else if (rules->policy.dfa &&
 		   rules->policy.start[AA_CLASS_FILE]) {