1fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes/* 2fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * Copyright (C) 2012 The Android Open Source Project 3fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * 4fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * Licensed under the Apache License, Version 2.0 (the "License"); 5fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * you may not use this file except in compliance with the License. 6fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * You may obtain a copy of the License at 7fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * 8fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * http://www.apache.org/licenses/LICENSE-2.0 9fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * 10fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * Unless required by applicable law or agreed to in writing, software 11fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * distributed under the License is distributed on an "AS IS" BASIS, 12fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * See the License for the specific language governing permissions and 14fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes * limitations under the License. 15fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes */ 16fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes 17fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes// Deliberately overwrite the stack canary. 18fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes__attribute__((noinline)) void modify_stack_protector_test() { 19fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes char buf[128]; 20fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes // We can't use memset here because it's fortified, and we want to test 21fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes // the line of defense *after* that. 226057d184f548a5f17e2c9467228d167243d9736aElliott Hughes // Without volatile, the generic x86/x86-64 targets don't write to the stack. 236057d184f548a5f17e2c9467228d167243d9736aElliott Hughes volatile char* p = buf; 246057d184f548a5f17e2c9467228d167243d9736aElliott Hughes int size = static_cast<int>(sizeof(buf) + 1); 256057d184f548a5f17e2c9467228d167243d9736aElliott Hughes while ((p - buf) < size) *p++ = '\0'; 26fc69a8ad5f0d9b63de48e3858fb4811ede7ac64eElliott Hughes} 27