diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp')
| -rw-r--r-- | src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp b/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp new file mode 100644 index 00000000..79df9d61 --- /dev/null +++ b/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp @@ -0,0 +1,210 @@ +/* $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 +} + |