lib/util/talloc_keep_secret.c

   1 /*
   2  * Copyright (c) 2019      Andreas Schneider <asn@samba.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "includes.h"
  19 #include "talloc_keep_secret.h"
  20
  21 static int talloc_keep_secret_destructor(void *ptr)
  22 {
  23         size_t size = talloc_get_size(ptr);
  24
  25         if (unlikely(size == 0)) {
  26                 return 0;
  27         }
  28
  29         memset_s(ptr, size, 0, size);
  30
  31         return 0;
  32 }
  33
  34 void _talloc_keep_secret(void *ptr, const char *name)
  35 {
  36         size_t size;
  37
  38         if (unlikely(ptr == NULL)) {
  39 #ifdef DEVELOPER
  40                 smb_panic("Invalid talloc pointer");
  41 #endif
  42                 return;
  43         }
  44
  45         size = talloc_get_size(ptr);
  46         if (unlikely(size == 0)) {
  47                 return;
  48         }
  49
  50         talloc_set_name_const(ptr, name);
  51         talloc_set_destructor(ptr, talloc_keep_secret_destructor);
  52 }