HostDrivers/Support/SUPR3HardenedNoCrt.cpp

13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/* $Id$ */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** @file
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * VirtualBox Support Library - Hardened main() no-crt routines.
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/*
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * Copyright (C) 2006-2014 Oracle Corporation
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync *
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * available from http://www.virtualbox.org. This file is free software;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * you can redistribute it and/or modify it under the terms of the GNU
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * General Public License (GPL) as published by the Free Software
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync *
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * The contents of this file may alternatively be used under the terms
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * of the Common Development and Distribution License Version 1.0
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * VirtualBox OSE distribution, in which case the provisions of the
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * CDDL are applicable instead of those of the GPL.
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync *
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * You may elect to license modified versions of this file under the
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync * terms and conditions of either the GPL or the CDDL or both.
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/*******************************************************************************
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync*   Header Files                                                               *
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync*******************************************************************************/
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync#if RT_OS_WINDOWS
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync# include <Windows.h>
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync#endif
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync#include <VBox/sup.h>
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync#include "SUPLibInternal.h"
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
fd658895339cb48b2ba581b1a1141aea39009ff7vboxsync#ifdef SUP_HARDENED_NEED_CRT_FUNCTIONS /** @todo this crap is obsolete. */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** memcmp */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(int) suplibHardenedMemComp(void const *pvDst, const void *pvSrc, size_t cbToComp)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    size_t const   *puDst = (size_t const *)pvDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    size_t const   *puSrc = (size_t const *)pvSrc;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (cbToComp >= sizeof(size_t))
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        if (*puDst != *puSrc)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            break;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        puDst++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        puSrc++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        cbToComp -= sizeof(size_t);
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    uint8_t const  *pbDst = (uint8_t const *)puDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    uint8_t const  *pbSrc = (uint8_t const *)puSrc;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (cbToComp > 0)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        if (*pbDst != *pbSrc)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            if (*pbDst < *pbSrc)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync                return -1;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            return 1;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        pbDst++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        pbSrc++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        cbToComp--;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return 0;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** memcpy */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(void *) suplibHardenedMemCopy(void *pvDst, const void *pvSrc, size_t cbToCopy)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    size_t         *puDst = (size_t *)pvDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    size_t const   *puSrc = (size_t const *)pvSrc;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (cbToCopy >= sizeof(size_t))
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        *puDst++ = *puSrc++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        cbToCopy -= sizeof(size_t);
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    uint8_t        *pbDst = (uint8_t *)puDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    uint8_t const  *pbSrc = (uint8_t const *)puSrc;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (cbToCopy > 0)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        *pbDst++ = *pbSrc++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        cbToCopy--;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return pvDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** memset */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(void *) suplibHardenedMemSet(void *pvDst, int ch, size_t cbToSet)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    uint8_t *pbDst = (uint8_t *)pvDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (cbToSet > 0)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        *pbDst++ = (uint8_t)ch;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        cbToSet--;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return pvDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** strcpy */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(char *) suplibHardenedStrCopy(char *pszDst, const char *pszSrc)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    char *pszRet = pszDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    char ch;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    do
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        ch = *pszSrc++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        *pszDst++ = ch;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    } while (ch);
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return pszRet;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** strlen */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(size_t) suplibHardenedStrLen(const char *psz)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    const char *pszStart = psz;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (*psz)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        psz++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return psz - pszStart;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** strcat */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(char *) suplibHardenedStrCat(char *pszDst, const char *pszSrc)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    char *pszRet = pszDst;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (*pszDst)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        pszDst++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    suplibHardenedStrCopy(pszDst, pszSrc);
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return pszRet;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** strcmp */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(int) suplibHardenedStrCmp(const char *psz1, const char *psz2)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    for (;;)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        char ch1 = *psz1++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        char ch2 = *psz2++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        if (ch1 != ch2)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            return ch1 < ch2 ? -1 : 1;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        if (ch1 == 0)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            return 0;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync/** strncmp */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsyncDECLHIDDEN(int) suplibHardenedStrNCmp(const char *psz1, const char *psz2, size_t cchMax)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync{
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    while (cchMax-- > 0)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    {
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        char ch1 = *psz1++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        char ch2 = *psz2++;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        if (ch1 != ch2)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            return ch1 < ch2 ? -1 : 1;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync        if (ch1 == 0)
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync            break;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    }
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync    return 0;
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync}
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync#endif /* SUP_HARDENED_NEED_CRT_FUNCTIONS */
13493ab7596e827b8d0caab2c89e635dd65f78f9vboxsync