elf/enbl-secure.c

   1 /* Define and initialize the `__libc_enable_secure' flag.  Generic version.
   2    Copyright (C) 1996, 1997, 1998, 2000, 2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* This file is used in the static libc.  For the shared library,
  21    dl-sysdep.c defines and initializes __libc_enable_secure.  */
  22
  23 #include <unistd.h>
  24 #include <libc-internal.h>
  25
  26 /* If nonzero __libc_enable_secure is already set.  */
  27 int __libc_enable_secure_decided;
  28 /* Safest assumption, if somehow the initializer isn't run.  */
  29 int __libc_enable_secure = 1;
  30
  31 void
  32 __libc_init_secure (void)
  33 {
  34   if (__libc_enable_secure_decided == 0)
  35     __libc_enable_secure = (__geteuid () != __getuid ()
  36                             || __getegid () != __getgid ());
  37 }