sysdeps/generic/malloc-sysdep.h

   1 /* System-specific malloc support functions.  Generic version.
   2    Copyright (C) 2012-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdbool.h>
  20 #include <unistd.h>
  21
  22 /* Force an unmap when the heap shrinks in a secure exec.  This ensures that
  23    the old data pages immediately cease to be accessible.  */
  24 static inline bool
  25 check_may_shrink_heap (void)
  26 {
  27   return __libc_enable_secure;
  28 }