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