uts: add a concept of a 'default' set of privileges, separate from 'basic'

*** 198,207 ****
--- 198,210 ----
                          libc_free(tmparr);
                          break;
                  case PRIV_INFO_BASICPRIVS:
                          tmp->pd_basicset = (priv_set_t *)&st->set[0];
                          break;
+                 case PRIV_INFO_DEFAULTPRIVS:
+                         tmp->pd_defaultset = (priv_set_t *)&st->set[0];
+                         break;
                  default:
                          /* unknown, ignore */
                          break;
                  }
                  x += na->info.priv_info_size;
*** 494,503 ****
--- 497,507 ----
  
          if (nset == NULL)
                  return (-1);
  
          /* Always add the basic set */
+         /* XXX: Always add the _default_ set? */
          if (d->pd_basicset != NULL)
                  priv_union(d->pd_basicset, nset);
  
          /*
           * This is not a significant failure: it allows us to start programs
*** 646,655 ****
--- 650,660 ----
                  goto end;
  
          priv_copyset(nset, bracketpriv);
  
          /* Always add the basic set */
+         /* XXX: Always add the default set? */
          priv_union(priv_basic(), nset);
  
          /* But don't add what we don't have */
          priv_intersect(tmpset, nset);
  
*** 873,882 ****
--- 878,893 ----
  {
          priv_copyset(priv_basic(), set);
  }
  
  void
+ priv_defaultset(priv_set_t *set)
+ {
+         priv_copyset(priv_default(), set);
+ }
+ 
+ void
  __priv_fillset(priv_data_t *d, priv_set_t *set)
  {
          (void) memset(set, ~0, d->pd_setsize);
  }