1950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris/* 2950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * Copyright (C) 2014 The Android Open Source Project 3950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * All rights reserved. 4950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * 5950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * Redistribution and use in source and binary forms, with or without 6950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * modification, are permitted provided that the following conditions 7950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * are met: 8950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * * Redistributions of source code must retain the above copyright 9950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * notice, this list of conditions and the following disclaimer. 10950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * * Redistributions in binary form must reproduce the above copyright 11950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * notice, this list of conditions and the following disclaimer in 12950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * the documentation and/or other materials provided with the 13950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * distribution. 14950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * 15950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * SUCH DAMAGE. 27950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris */ 28950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris 29950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris#undef _FORTIFY_SOURCE 30950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris 31950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris#include <string.h> 32950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris#include <stdlib.h> 33950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris#include "private/libc_logging.h" 34950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris 35950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris/* 36950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * Runtime implementation of __builtin____stpcpy_chk. 37950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * 38950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * See 39950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html 40950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html 41950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * for details. 42950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * 43950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * This stpcpy check is called if _FORTIFY_SOURCE is defined and 44950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris * greater than 0. 45950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris */ 46950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferrisextern "C" char* __stpcpy_chk(char* dest, const char* src, size_t dest_len) { 47950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris // TODO: optimize so we don't scan src twice. 48950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris size_t src_len = strlen(src) + 1; 49950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris if (__predict_false(src_len > dest_len)) { 50950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris __fortify_chk_fail("stpcpy: prevented write past end of buffer", 51950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris BIONIC_EVENT_STPCPY_BUFFER_OVERFLOW); 52950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris } 53950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris 54950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris return stpcpy(dest, src); 55950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris} 56