hurd/hurdid.c

   1 /* Copyright (C) 1993-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <hurd.h>
  19 #include <hurd/id.h>
  20 #include "set-hooks.h"
  21
  22 struct hurd_id_data _hurd_id;
  23
  24
  25 /* Check that _hurd_id.{gen,aux} are valid and update them if not.
  26    Expects _hurd_id.lock to be held and does not release it.  */
  27
  28 error_t
  29 _hurd_check_ids (void)
  30 {
  31   if (! _hurd_id.valid)
  32     {
  33       inline void dealloc (__typeof (_hurd_id.gen) *p)
  34         {
  35           if (p->uids)
  36             {
  37               __vm_deallocate (__mach_task_self (),
  38                                (vm_address_t) p->uids,
  39                                p->nuids * sizeof (uid_t));
  40               p->uids = NULL;
  41             }
  42           p->nuids = 0;
  43           if (p->gids)
  44             {
  45               __vm_deallocate (__mach_task_self (),
  46                                (vm_address_t) p->gids,
  47                                p->ngids * sizeof (gid_t));
  48               p->gids = NULL;
  49             }
  50           p->ngids = 0;
  51         }
  52
  53       error_t err;
  54
  55       dealloc (&_hurd_id.gen);
  56       dealloc (&_hurd_id.aux);
  57
  58       if (_hurd_id.rid_auth != MACH_PORT_NULL)
  59         {
  60           __mach_port_deallocate (__mach_task_self (), _hurd_id.rid_auth);
  61           _hurd_id.rid_auth = MACH_PORT_NULL;
  62         }
  63
  64       if (err = __USEPORT (AUTH, __auth_getids
  65                            (port,
  66                             &_hurd_id.gen.uids, &_hurd_id.gen.nuids,
  67                             &_hurd_id.aux.uids, &_hurd_id.aux.nuids,
  68                             &_hurd_id.gen.gids, &_hurd_id.gen.ngids,
  69                             &_hurd_id.aux.gids, &_hurd_id.aux.ngids)))
  70         return err;
  71
  72       _hurd_id.valid = 1;
  73     }
  74
  75   return 0;
  76 }
  77
  78 static void attribute_used_retain
  79 init_id (void)
  80 {
  81   __mutex_init (&_hurd_id.lock);
  82   _hurd_id.valid = 0;
  83   _hurd_id.rid_auth = MACH_PORT_NULL;
  84   _hurd_id.gen.uids = _hurd_id.aux.uids = NULL;
  85   _hurd_id.gen.nuids = _hurd_id.aux.nuids = 0;
  86   _hurd_id.gen.gids = _hurd_id.aux.gids = NULL;
  87   _hurd_id.gen.ngids = _hurd_id.aux.ngids = 0;
  88 }
  89 SET_RELHOOK (_hurd_preinit_hook, init_id);