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diff -up sudo-1.8.6p3/plugins/sudoers/match.c.nonehostname sudo-1.8.6p3/plugins/sudoers/match.c
--- sudo-1.8.6p3/plugins/sudoers/match.c.nonehostname 2014-05-19 12:50:08.412313041 +0200
+++ sudo-1.8.6p3/plugins/sudoers/match.c 2014-05-19 12:50:17.787348134 +0200
@@ -727,7 +727,8 @@ netgr_matches(char *netgr, char *lhost,
/* get the domain name (if any) */
if (!initialized) {
domain = (char *) emalloc(MAXHOSTNAMELEN + 1);
- if (getdomainname(domain, MAXHOSTNAMELEN + 1) == -1 || *domain == '\0') {
+ if (getdomainname(domain, MAXHOSTNAMELEN + 1) == -1 || *domain == '\0'
+ || strncmp (domain, "(none)", 7) == 0) {
efree(domain);
domain = NULL;
}