1/* Define and initialize the `__libc_enable_secure' flag. Generic version.
2 Copyright (C) 1996-2022 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 <https://www.gnu.org/licenses/>. */
18
19/* This file is used in the static libc. For the shared library,
20 dl-sysdep.c defines and initializes __libc_enable_secure. */
21
22/* Mark symbols hidden in static PIE for early self relocation to work. */
23#if BUILD_PIE_DEFAULT
24# pragma GCC visibility push(hidden)
25#endif
26#include <startup.h>
27#include <libc-internal.h>
28
29/* If nonzero __libc_enable_secure is already set. */
30int __libc_enable_secure_decided;
31/* Safest assumption, if somehow the initializer isn't run. */
32int __libc_enable_secure = 1;
33
34void
35__libc_init_secure (void)
36{
37 if (__libc_enable_secure_decided == 0)
38 __libc_enable_secure = (startup_geteuid () != startup_getuid ()
39 || startup_getegid () != startup_getgid ());
40}
41