/* $Id: memuserkernel-r0drv-nt.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */ /** @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 . * * 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 #include #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 }