44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*
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* Copyright (C) 2014 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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class A {
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public:
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virtual int getRandomNumber() {
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return 4; // chosen by fair dice roll.
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// guaranteed to be random.
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}
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virtual ~A() {}
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};
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A a;
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// nested macros to make it easy to define a large amount of read-only data
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// which will require relocation.
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#define A_16 &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a,
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#define A_128 A_16 A_16 A_16 A_16 A_16 A_16 A_16 A_16
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#define A_1024 A_128 A_128 A_128 A_128 A_128 A_128 A_128 A_128
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extern "C" A* const lots_of_relro[] = {
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A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024
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};
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extern "C" int getRandomNumber() {
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// access the relro section (twice, in fact, once for the pointer, and once
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// for the vtable of A) to check it's actually there.
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return lots_of_relro[0]->getRandomNumber();
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}
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