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 "libc_logging.h" 33 34 /* 35 * Runtime implementation of __builtin____vsprintf_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 vsprintf check is called if _FORTIFY_SOURCE is defined and 43 * greater than 0. 44 */ 45 extern "C" int __vsprintf_chk( 46 char *dest, 47 int /*flags*/, 48 size_t dest_len_from_compiler, 49 const char *format, 50 va_list va) 51 { 52 int ret = vsnprintf(dest, dest_len_from_compiler, format, va); 53 54 if ((size_t) ret >= dest_len_from_compiler) { 55 __fortify_chk_fail("vsprintf buffer overflow", 0); 56 } 57 58 return ret; 59 } 60 61 /* 62 * Runtime implementation of __builtin____sprintf_chk. 63 * 64 * See 65 * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html 66 * http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html 67 * for details. 68 * 69 * This sprintf check is called if _FORTIFY_SOURCE is defined and 70 * greater than 0. 71 */ 72 extern "C" int __sprintf_chk( 73 char *dest, 74 int flags, 75 size_t dest_len_from_compiler, 76 const char *format, ...) 77 { 78 va_list va; 79 int retval; 80 81 va_start(va, format); 82 retval = __vsprintf_chk(dest, flags, 83 dest_len_from_compiler, format, va); 84 va_end(va); 85 86 return retval; 87 } 88
