/*

 * Copyright (c) 2019      Andreas Schneider <asn@samba.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include "replace.h"

#include <talloc.h>

#include "lib/util/fault.h"

#include "talloc_keep_secret.h"

static int talloc_keep_secret_destructor(void *ptr)

{

  size_t size = talloc_get_size(ptr);

  if (unlikely(size == 0)) {

    return 0;

  }

  BURN_PTR_SIZE(ptr, size);

  return 0;

}

void _talloc_keep_secret(void *ptr, const char *name)

{

  size_t size;

  if (unlikely(ptr == NULL)) {

#ifdef DEVELOPER

    smb_panic("Invalid talloc pointer");

#endif

    return;

  }

  size = talloc_get_size(ptr);

  if (unlikely(size == 0)) {

    return;

  }

  /*

   * Overwrite talloc name only if it reveals memory content.

   * That prevents breaking talloc_get_type_abort().

   */

  if (talloc_get_name(ptr) == ptr) {

    talloc_set_name_const(ptr, name);

  }

  talloc_set_destructor(ptr, talloc_keep_secret_destructor);

}