e2617290fc
FORTIFY_SOURCE prevents buffer overflows from occurring. However, the error message often implies that we only detect it, not prevent it. Bring more clarity to the error messages by emphasizing prevention over detection. Change-Id: I5f3e1478673bdfc589e6cc4199fce8e52e197a24
87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include "libc_logging.h"
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/*
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* Runtime implementation of __builtin____vsprintf_chk.
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*
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* See
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* http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
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* http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
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* for details.
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*
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* This vsprintf check is called if _FORTIFY_SOURCE is defined and
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* greater than 0.
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*/
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extern "C" int __vsprintf_chk(
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char *dest,
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int /*flags*/,
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size_t dest_len_from_compiler,
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const char *format,
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va_list va)
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{
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int ret = vsnprintf(dest, dest_len_from_compiler, format, va);
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if ((size_t) ret >= dest_len_from_compiler) {
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__fortify_chk_fail("vsprintf buffer overflow prevented", 0);
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}
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return ret;
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}
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/*
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* Runtime implementation of __builtin____sprintf_chk.
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*
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* See
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* http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
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* http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
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* for details.
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*
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* This sprintf check is called if _FORTIFY_SOURCE is defined and
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* greater than 0.
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*/
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extern "C" int __sprintf_chk(
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char *dest,
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int flags,
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size_t dest_len_from_compiler,
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const char *format, ...)
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{
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va_list va;
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int retval;
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va_start(va, format);
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retval = __vsprintf_chk(dest, flags,
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dest_len_from_compiler, format, va);
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va_end(va);
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return retval;
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}
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