memsafer-generic.cpp revision f92042f693128b9623ad16b654c5f0b8fbfb315f
/* $Id$ */
/** @file
* IPRT - Memory Allocate for Sensitive Data, generic heap-based implementation.
*/
/*
* Copyright (C) 2006-2014 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <iprt/memsafer.h>
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
/** Allocation size alignment. */
#define RTMEMSAFER_ALIGN 16
/** Padding after the block to avoid small overruns. */
#define RTMEMSAFER_PAD_BEFORE 96
/** Padding after the block to avoid small underruns. */
#define RTMEMSAFER_PAD_AFTER 32
/*******************************************************************************
* Global Variables *
*******************************************************************************/
/** XOR scrabler value.
* @todo determine this at runtime */
#if ARCH_BITS == 32
#else
# error "Bad ARCH_BITS value"
#endif
{
/* Note! This isn't supposed to be safe, just less obvious. */
while (cb > 0)
{
*pu ^= g_uScramblerXor;
pu++;
}
return VINF_SUCCESS;
}
{
/* Note! This isn't supposed to be safe, just less obvious. */
while (cb > 0)
{
*pu ^= g_uScramblerXor;
pu++;
}
return VINF_SUCCESS;
}
{
/*
* Don't request zeroed memory. We want random heap garbage in the
* padding zones, notthing that makes our allocations easier to find.
*/
if (pvNew)
{
#ifdef RT_STRICT /* For checking input in string builds. */
#endif
/* You don't use this API for performance, so we always clean memory. */
return VINF_SUCCESS;
}
return VERR_NO_MEMORY;
}
{
if (pv)
{
}
else
}
RTDECL(int) RTMemSaferReallocZExTag(size_t cbOld, void *pvOld, size_t cbNew, void **ppvNew, const char *pszTag) RT_NO_THROW
{
/*
* We cannot let the heap move us around because we will be failing in our
* duty to clean things up. So, allocate a new block, copy over the old
* content, and free the old one.
*/
int rc;
/* Real realloc. */
{
void *pvNew;
if (RT_SUCCESS(rc))
{
}
}
/* First allocation. */
else if (!cbOld)
{
}
/* Free operation*/
else
{
rc = VINF_SUCCESS;
}
return rc;
}
{
if (RT_SUCCESS(rc))
return pvNew;
return NULL;
}
RTDECL(void *) RTMemSaferReallocZTag(size_t cbOld, void *pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW
{
if (RT_SUCCESS(rc))
return pvNew;
return NULL;
}