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 29950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris#undef _FORTIFY_SOURCE 30950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferris 310a2301598c207fd1b50015984942fee5e8511593Nick Kralevich#include <string.h> 320a2301598c207fd1b50015984942fee5e8511593Nick Kralevich#include <stdlib.h> 33eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/libc_logging.h" 340a2301598c207fd1b50015984942fee5e8511593Nick Kralevich 350a2301598c207fd1b50015984942fee5e8511593Nick Kralevich/* 360a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * Runtime implementation of __builtin____strcpy_chk. 370a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * 380a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * See 390a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html 400a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html 410a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * for details. 420a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * 430a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * This strcpy check is called if _FORTIFY_SOURCE is defined and 440a2301598c207fd1b50015984942fee5e8511593Nick Kralevich * greater than 0. 450a2301598c207fd1b50015984942fee5e8511593Nick Kralevich */ 46950a58e24d1019eb9d814dbb16f111a6b61e3f23Christopher Ferrisextern "C" char* __strcpy_chk(char* dest, const char* src, size_t dest_len) { 47d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes // TODO: optimize so we don't scan src twice. 48d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes size_t src_len = strlen(src) + 1; 49d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes if (__predict_false(src_len > dest_len)) { 50d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes __fortify_chk_fail("strcpy: prevented write past end of buffer", 51d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes BIONIC_EVENT_STRCPY_BUFFER_OVERFLOW); 52d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes } 530a2301598c207fd1b50015984942fee5e8511593Nick Kralevich 54d1eda33f012e46083b91e087fb79d14a5ce70f0eElliott Hughes return strcpy(dest, src); 550a2301598c207fd1b50015984942fee5e8511593Nick Kralevich} 56