File dnsmasq-groups.patch of Package dnsmasq.19459

--- src/dnsmasq.c.orig
+++ src/dnsmasq.c
@@ -581,11 +581,10 @@ int main (int argc, char **argv)
   if (!option_bool(OPT_DEBUG) && getuid() == 0)   
     {
       int bad_capabilities = 0;
-      gid_t dummy;
       
-      /* remove all supplementary groups */
+      /* set the supplementary groups of the daemon user */
       if (gp && 
-	  (setgroups(0, &dummy) == -1 ||
+	  (initgroups(daemon->username, gp->gr_gid) == -1 ||
 	   setgid(gp->gr_gid) == -1))
 	{
 	  send_event(err_pipe[1], EVENT_GROUP_ERR, errno, daemon->groupname);