8b142566e3
vdso should be available in all namespaces when present. This
bug went undetected because the way libc currently uses vdso (it
does all the lookups itself). This makes it available for the
programs that want to take advantage by dlopening it.
Bug: http://b/73105445
Bug: http://b/79561555
Test: adb shell /data/nativetest/arm/bionic-unit-tests/bionic-unit-tests --gtest_filter=dl.exec_with_ld_config_file
Test: adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests --gtest_filter=dl*
Change-Id: I8eae0c9848f256190d1c9ec85d10dc6ce383a8bc
(cherry picked from commit 69c68c46ac)
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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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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#include <dlfcn.h>
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#include <errno.h>
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#include <stdio.h>
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#if __has_include(<sys/auxv.h>)
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#include <sys/auxv.h>
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#endif
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#include <unistd.h>
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extern int get_value_from_lib();
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int main() {
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bool skip_vdso_check = false;
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#if __has_include(<sys/auxv.h>)
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if (getauxval(AT_SYSINFO_EHDR) == 0) {
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skip_vdso_check = true;
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}
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#endif
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if (!skip_vdso_check) {
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const char* vdso_name = "linux-vdso.so.1";
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#if defined(__i386__)
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vdso_name = "linux-gate.so.1";
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#endif
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void* handle = dlopen(vdso_name, RTLD_NOW);
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if (handle == nullptr) {
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printf("%s", dlerror());
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return 1;
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}
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dlclose(handle);
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}
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printf("%d", get_value_from_lib());
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return 0;
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}
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