memuserkernel-r0drv-linux.c revision 4a3597d414ee393ddb297fda90b7f16c95f672d9
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync/* $Id$ */
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync/** @file
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * IPRT - User & Kernel Memory, Ring-0 Driver, Linux.
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync */
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync/*
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * Copyright (C) 2009 Sun Microsystems, Inc.
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync *
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * available from http://www.virtualbox.org. This file is free software;
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * you can redistribute it and/or modify it under the terms of the GNU
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * General Public License (GPL) as published by the Free Software
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync *
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * The contents of this file may alternatively be used under the terms
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * of the Common Development and Distribution License Version 1.0
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * VirtualBox OSE distribution, in which case the provisions of the
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * CDDL are applicable instead of those of the GPL.
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync *
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * You may elect to license modified versions of this file under the
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * terms and conditions of either the GPL or the CDDL or both.
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync *
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync * additional information or have any questions.
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync */
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync/*******************************************************************************
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync* Header Files *
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync*******************************************************************************/
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync#include "the-linux-kernel.h"
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync#include "internal/iprt.h"
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync#include <iprt/mem.h>
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync#include <iprt/err.h>
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsyncRTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync{
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync if (RT_LIKELY(copy_from_user(pvDst, (void *)R3PtrSrc, cb) == 0))
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return VINF_SUCCESS;
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return VERR_ACCESS_DENIED;
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTR0MemUserCopyFrom);
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsyncRTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync{
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync if (RT_LIKELY(copy_to_user((void *)R3PtrDst, pvSrc, cb) == 0))
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return VINF_SUCCESS;
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return VERR_ACCESS_DENIED;
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTR0MemUserCopyTo);
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsyncRTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync{
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return access_ok(VERIFY_READ, (void *)R3Ptr, 1);
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTR0MemUserIsValidAddr);
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsyncRTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync{
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync /* Couldn't find a straight forward way of doing this... */
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync#ifdef RT_ARCH_X86
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync# ifdef CONFIG_X86_HIGH_ENTRY
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return true; /* ?? */
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync# else
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return (uintptr_t)pv >= PAGE_OFFSET;
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync# endif
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
4a3597d414ee393ddb297fda90b7f16c95f672d9vboxsync#elif defined(RT_ARCH_AMD64)
e4b670a2ad018b9df9f1a71eda6952964b716fb8vboxsync# ifdef KERNEL_IMAGE_START
e4b670a2ad018b9df9f1a71eda6952964b716fb8vboxsync return (uintptr_t)pv >= KERNEL_IMAGE_START;
e4b670a2ad018b9df9f1a71eda6952964b716fb8vboxsync# else
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return (uintptr_t)pv >= KERNEL_TEXT_START;
e4b670a2ad018b9df9f1a71eda6952964b716fb8vboxsync# endif
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync#else
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync# error "PORT ME"
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync return !access_ok(VERIFY_READ, pv, 1);
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync#endif
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTR0MemKernelIsValidAddr);
b7ec8f4ea9e7f5afb06094384fa4864ccd8db63dvboxsync
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync
e46c8087ca88848a243cbff553e04a29726ed556vboxsyncRTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync{
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync#if defined(RT_ARCH_X86) && defined(CONFIG_X86_HIGH_ENTRY) /* ?? */
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync return false;
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync#else
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync return true;
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync#endif
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTR0MemAreKrnlAndUsrDifferent);
522c8eb2dc41dc85adeb8343aa7c0d799335fcafvboxsync