Laurent Morichetti
63 wiersze
2.1 KiB
C
63 wiersze
2.1 KiB
C
/*
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* Copyright (c) 2016-2019 The Khronos Group Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* OpenCL is a trademark of Apple Inc. used under license by Khronos.
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*/
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// for secure_getenv():
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include "icd_cmake_config.h"
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#include <stdlib.h>
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char *khrIcd_getenv(const char *name) {
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// No allocation of memory necessary for Linux.
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return getenv(name);
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}
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char *khrIcd_secure_getenv(const char *name) {
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#if defined(__APPLE__)
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// Apple does not appear to have a secure getenv implementation.
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// The main difference between secure getenv and getenv is that secure getenv
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// returns NULL if the process is being run with elevated privileges by a normal user.
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// The idea is to prevent the reading of malicious environment variables by a process
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// that can do damage.
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// This algorithm is derived from glibc code that sets an internal
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// variable (__libc_enable_secure) if the process is running under setuid or setgid.
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return geteuid() != getuid() || getegid() != getgid() ? NULL : khrIcd_getenv(name);
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#else
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// Linux
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#ifdef HAVE_SECURE_GETENV
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return secure_getenv(name);
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#elif defined(HAVE___SECURE_GETENV)
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return __secure_getenv(name);
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#else
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#pragma message( \
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"Warning: Falling back to non-secure getenv for environmental lookups! Consider" \
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" updating to a different libc.")
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return khrIcd_getenv(name);
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#endif
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#endif
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}
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void khrIcd_free_getenv(char *val) {
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// No freeing of memory necessary for Linux, but we should at least touch
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// val to get rid of compiler warnings.
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(void)val;
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}
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