1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // Deliberately overwrite the stack canary. modify_stack_protector_test()18 __attribute__((noinline, optnone)) void modify_stack_protector_test() { 19 // We can't use memset here because it's fortified, and we want to test 20 // the line of defense *after* that. 21 // We can't make a constant change, since the existing byte might already have 22 // had that value. 23 char* p = reinterpret_cast<char*>(&p + 1); 24 *p = ~*p; 25 } 26