1 /* Define and initialize the `__libc_enable_secure' flag. Generic version. 2 Copyright (C) 1996-2021 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. */ 30 int __libc_enable_secure_decided; 31 /* Safest assumption, if somehow the initializer isn't run. */ 32 int __libc_enable_secure = 1; 33 34 void __libc_init_secure(void)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