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/* $Id: memuserkernel-r0drv-nt.cpp $ */
/** @file
* IPRT - User & Kernel Memory, Ring-0 Driver, NT.
*/
/*
* Copyright (C) 2009-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "the-nt-kernel.h"
#include <iprt/mem.h>
#include <iprt/errcore.h>
#include "internal-r0drv-nt.h"
RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
{
__try
{
ProbeForRead((PVOID)R3PtrSrc, cb, 1);
memcpy(pvDst, (void const *)R3PtrSrc, cb);
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return VERR_ACCESS_DENIED;
}
return VINF_SUCCESS;
}
RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
{
__try
{
ProbeForWrite((PVOID)R3PtrDst, cb, 1);
memcpy((void *)R3PtrDst, pvSrc, cb);
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return VERR_ACCESS_DENIED;
}
return VINF_SUCCESS;
}
RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
{
#ifdef IPRT_TARGET_NT4
uintptr_t const uLast = g_puRtMmHighestUserAddress ? *g_puRtMmHighestUserAddress : ~(uintptr_t)0 / 2;
#else
uintptr_t const uLast = (uintptr_t)MM_HIGHEST_USER_ADDRESS;
#endif
return R3Ptr <= uLast;
}
RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
{
#ifdef IPRT_TARGET_NT4
uintptr_t const uFirst = g_puRtMmSystemRangeStart ? *g_puRtMmSystemRangeStart : ~(uintptr_t)0 / 2 + 1;
#else
uintptr_t const uFirst = (uintptr_t)MM_SYSTEM_RANGE_START;
#endif
return (uintptr_t)pv >= uFirst;
}
RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
{
return true;
}
RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
{
if (!RTR0MemKernelIsValidAddr((void *)pvSrc))
return VERR_ACCESS_DENIED;
uint8_t *pbDst = (uint8_t *)pvDst;
uint8_t const *pbSrc = (uint8_t const *)pvSrc;
#if 0
/*
* The try+except stuff does not work for kernel addresses.
*/
__try
{
while (cb-- > 0)
*pbDst++ = *pbSrc++;
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return VERR_ACCESS_DENIED;
}
#else
/*
* This is the best I can come up with for now: Work page-by-page using MmIsAddressValid.
*/
while (cb > 0)
{
if (!MmIsAddressValid((PVOID)pbSrc))
return VERR_ACCESS_DENIED;
size_t cbToCopy = (uintptr_t)pbSrc & PAGE_OFFSET_MASK;
if (cbToCopy > cb)
cbToCopy = cb;
cb -= cbToCopy;
__try /* doesn't work, but can't hurt, right? */
{
while (cbToCopy-- > 0)
*pbDst++ = *pbSrc++;
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return VERR_ACCESS_DENIED;
}
}
#endif
return VINF_SUCCESS;
}
RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
{
if (!RTR0MemKernelIsValidAddr(pvDst))
return VERR_ACCESS_DENIED;
#if 0
uint8_t *pbDst = (uint8_t *)pvDst;
uint8_t const *pbSrc = (uint8_t const *)pvSrc;
# if 0
/*
* The try+except stuff does not work for kernel addresses.
*/
__try
{
while (cb-- > 0)
*pbDst++ = *pbSrc++;
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return VERR_ACCESS_DENIED;
}
# else
/*
* This is the best I can come up with for now: Work page-by-page using MmIsAddressValid.
* Note! MmIsAddressValid does not indicate that it's writable, so we're a bit buggered if it isn't...
*/
while (cb > 0)
{
if (!MmIsAddressValid((PVOID)pbSrc))
return VERR_ACCESS_DENIED;
size_t cbToCopy = (uintptr_t)pbSrc & PAGE_OFFSET_MASK;
if (cbToCopy > cb)
cbToCopy = cb;
cb -= cbToCopy;
__try /* doesn't work, but can't hurt, right? */
{
while (cbToCopy-- > 0)
*pbDst++ = *pbSrc++;
}
__except(EXCEPTION_EXECUTE_HANDLER)
{
return VERR_ACCESS_DENIED;
}
}
# endif
return VINF_SUCCESS;
#else
RT_NOREF(pvDst, pvSrc, cb);
return VERR_NOT_SUPPORTED;
#endif
}
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