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 "replace.h"
  19 #include <talloc.h>
  20 #include "lib/util/fault.h"
  21 #include "talloc_keep_secret.h"
  22
  23 static int talloc_keep_secret_destructor(void *ptr)
  24 {
  25         size_t size = talloc_get_size(ptr);
  26
  27         if (unlikely(size == 0)) {
  28                 return 0;
  29         }
  30
  31         BURN_PTR_SIZE(ptr, size);
  32
  33         return 0;
  34 }
  35
  36 void _talloc_keep_secret(void *ptr, const char *name)
  37 {
  38         size_t size;
  39
  40         if (unlikely(ptr == NULL)) {
  41 #ifdef DEVELOPER
  42                 smb_panic("Invalid talloc pointer");
  43 #endif
  44                 return;
  45         }
  46
  47         size = talloc_get_size(ptr);
  48         if (unlikely(size == 0)) {
  49                 return;
  50         }
  51
  52         talloc_set_name_const(ptr, name);
  53         talloc_set_destructor(ptr, talloc_keep_secret_destructor);
  54 }