1/* Copyright (C) 2017-2020 Free Software Foundation, Inc. 2 3This file is part of GCC. 4 5GCC is free software; you can redistribute it and/or modify 6it under the terms of the GNU General Public License as published by 7the Free Software Foundation; either version 3, or (at your option) 8any later version. 9 10GCC is distributed in the hope that it will be useful, 11but WITHOUT ANY WARRANTY; without even the implied warranty of 12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13GNU General Public License for more details. 14 15Under Section 7 of GPL version 3, you are granted additional 16permissions described in the GCC Runtime Library Exception, version 173.1, as published by the Free Software Foundation. 18 19You should have received a copy of the GNU General Public License and 20a copy of the GCC Runtime Library Exception along with this program; 21see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 22<http://www.gnu.org/licenses/>. */ 23 24#ifndef _SECURE_GETENV_H 25#define _SECURE_GETENV_H 1 26 27/* Secure getenv() which returns NULL if running as SUID/SGID. */ 28#ifndef HAVE_SECURE_GETENV 29#if defined (HAVE_UNISTD_H) && defined (HAVE_GETUID) \ 30 && defined (HAVE_GETEUID) && defined (HAVE_GETGID) \ 31 && defined (HAVE_GETEGID) 32 33#include <unistd.h> 34 35#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV) 36static char* weak_secure_getenv (const char*) 37 __attribute__((__weakref__("__secure_getenv"))); 38#endif 39 40/* Implementation of secure_getenv() for targets where it is not provided but 41 we have at least means to test real and effective IDs. */ 42 43static inline char * 44secure_getenv (const char *name) 45{ 46#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV) 47 if (weak_secure_getenv) 48 return weak_secure_getenv (name); 49#endif 50 51 if ((getuid () == geteuid ()) && (getgid () == getegid ())) 52 return getenv (name); 53 else 54 return NULL; 55} 56#else 57#define secure_getenv getenv 58#endif 59#endif 60 61#endif /* _SECURE_GETENV_H. */ 62