10a2301598c207fd1b50015984942fee5e8511593Nick Kralevich/* 20a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * Copyright (C) 2012 The Android Open Source Project 30a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * All rights reserved. 40a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * 50a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * Redistribution and use in source and binary forms, with or without 60a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * modification, are permitted provided that the following conditions 70a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * are met: 80a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * * Redistributions of source code must retain the above copyright 90a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * notice, this list of conditions and the following disclaimer. 100a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * * Redistributions in binary form must reproduce the above copyright 110a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * notice, this list of conditions and the following disclaimer in 120a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * the documentation and/or other materials provided with the 130a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * distribution. 140a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * 150a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 160a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 170a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 180a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 190a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 200a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 210a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 220a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 230a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 240a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 250a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 260a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * SUCH DAMAGE. 270a2301598c207fd1b50015984942fee5e8511593Nick Kralevich */ 280a2301598c207fd1b50015984942fee5e8511593Nick Kralevich 29f3913b5b68347ce9a4cb17977df2c33f1e8f6000Nick Kralevich#undef _FORTIFY_SOURCE 300a2301598c207fd1b50015984942fee5e8511593Nick Kralevich#include <string.h> 310a2301598c207fd1b50015984942fee5e8511593Nick Kralevich#include <stdlib.h> 32eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/libc_logging.h" 330a2301598c207fd1b50015984942fee5e8511593Nick Kralevich 340a2301598c207fd1b50015984942fee5e8511593Nick Kralevich/* 35c37fc1ab6a3ac3956a8c9ba3ac089d41969815edNick Kralevich * Runtime implementation of __memcpy_chk. 360a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * 370a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * See 380a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html 390a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html 400a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * for details. 410a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * 420a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * This memcpy check is called if _FORTIFY_SOURCE is defined and 430a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * greater than 0. 440a2301598c207fd1b50015984942fee5e8511593Nick Kralevich */ 45d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughesextern "C" void* __memcpy_chk(void* dest, const void* src, 46d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes size_t copy_amount, size_t dest_len) { 47d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes if (__predict_false(copy_amount > dest_len)) { 48d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes __fortify_chk_fail("memcpy: prevented write past end of buffer", 49d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW); 50d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes } 510a2301598c207fd1b50015984942fee5e8511593Nick Kralevich 52d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes return memcpy(dest, src, copy_amount); 530a2301598c207fd1b50015984942fee5e8511593Nick Kralevich} 54