1cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich/* 2cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * Copyright (C) 2012 The Android Open Source Project 3cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * All rights reserved. 4cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * 5cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * Redistribution and use in source and binary forms, with or without 6cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * modification, are permitted provided that the following conditions 7cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * are met: 8cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * * Redistributions of source code must retain the above copyright 9cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * notice, this list of conditions and the following disclaimer. 10cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * * Redistributions in binary form must reproduce the above copyright 11cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * notice, this list of conditions and the following disclaimer in 12cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * the documentation and/or other materials provided with the 13cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * distribution. 14cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * 15cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * SUCH DAMAGE. 27cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich */ 28cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich 29cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich#include <stdio.h> 30cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich#include <stdlib.h> 31cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich#include <stdarg.h> 32cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich#include <private/logd.h> 33cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich 34cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich/* 35cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * Runtime implementation of __builtin____vsnprintf_chk. 36cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * 37cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * See 38cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html 39cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html 40cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * for details. 41cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * 42cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * This vsnprintf check is called if _FORTIFY_SOURCE is defined and 43cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich * greater than 0. 44cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich */ 45cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevichint __vsnprintf_chk( 46cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich char *dest, 47cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich size_t supplied_size, 48cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich int flags, 49cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich size_t dest_len_from_compiler, 50cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich const char *format, 51cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich va_list va) 52cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich{ 53cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich if (supplied_size > dest_len_from_compiler) { 54cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich __libc_android_log_print(ANDROID_LOG_FATAL, "libc", 55cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich "*** vsnprintf buffer overflow detected ***\n"); 56cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich abort(); 57cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich } 58cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich 59cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich return vsnprintf(dest, supplied_size, format, va); 60cffdf6693ffb50d2a1258d955a162bca83038f25Nick Kralevich} 61