e4c6b08c4e
Don't use FORTIFY_SOURCE on functions which implement FORTIFY_SOURCE, to avoid infinite recursion problems. The previous patch only addressed one of the problems. Bug: 12216860 Change-Id: I6f30ae7cb5b481be9942add18182ea4839d348a6
74 lines
2.7 KiB
C++
74 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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#undef _FORTIFY_SOURCE
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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 "private/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(char* dest, int /*flags*/,
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size_t dest_len_from_compiler, const char* format, va_list va) {
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int result = vsnprintf(dest, dest_len_from_compiler, format, va);
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if ((size_t) result >= dest_len_from_compiler) {
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__fortify_chk_fail("vsprintf: prevented write past end of buffer", 0);
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}
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return result;
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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(char* dest, int flags,
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size_t dest_len_from_compiler, const char* format, ...) {
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va_list va;
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va_start(va, format);
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int result = __vsprintf_chk(dest, flags, dest_len_from_compiler, format, va);
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va_end(va);
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return result;
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}
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