| 1 | /* $Id: memuserkernel-r0drv-linux.c 27669 2010-03-24 15:04:38Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - User & Kernel Memory, Ring-0 Driver, Linux.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | *
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| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #include "the-linux-kernel.h"
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| 36 | #include "internal/iprt.h"
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| 37 |
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| 38 | #include <iprt/mem.h>
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| 39 | #include <iprt/err.h>
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| 40 |
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| 41 |
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| 42 | RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
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| 43 | {
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| 44 | if (RT_LIKELY(copy_from_user(pvDst, (void *)R3PtrSrc, cb) == 0))
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| 45 | return VINF_SUCCESS;
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| 46 | return VERR_ACCESS_DENIED;
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| 47 | }
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| 48 | RT_EXPORT_SYMBOL(RTR0MemUserCopyFrom);
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| 49 |
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| 50 |
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| 51 | RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
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| 52 | {
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| 53 | if (RT_LIKELY(copy_to_user((void *)R3PtrDst, pvSrc, cb) == 0))
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| 54 | return VINF_SUCCESS;
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| 55 | return VERR_ACCESS_DENIED;
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| 56 | }
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| 57 | RT_EXPORT_SYMBOL(RTR0MemUserCopyTo);
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| 58 |
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| 59 |
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| 60 | RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
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| 61 | {
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| 62 | return access_ok(VERIFY_READ, (void *)R3Ptr, 1);
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| 63 | }
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| 64 | RT_EXPORT_SYMBOL(RTR0MemUserIsValidAddr);
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| 65 |
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| 66 |
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| 67 | RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
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| 68 | {
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| 69 | /* Couldn't find a straight forward way of doing this... */
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| 70 | #ifdef RT_ARCH_X86
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| 71 | # ifdef CONFIG_X86_HIGH_ENTRY
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| 72 | return true; /* ?? */
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| 73 | # else
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| 74 | return (uintptr_t)pv >= PAGE_OFFSET;
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| 75 | # endif
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| 76 |
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| 77 | #elif defined(RT_ARCH_AMD64)
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| 78 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
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| 79 | /* Linux 2.6.0 ... 2.6.10 set PAGE_OFFSET to 0x0000010000000000.
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| 80 | * Linux 2.6.11 sets PAGE_OFFSET to 0xffff810000000000.
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| 81 | * Linux 2.6.33 sets PAGE_OFFSET to 0xffff880000000000. */
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| 82 | return (uintptr_t)pv >= PAGE_OFFSET;
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| 83 | # else
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| 84 | /* Not correct (KERNEL_TEXT_START=0xffffffff80000000),
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| 85 | * VMALLOC_START (0xffffff0000000000) would be better */
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| 86 | return (uintptr_t)pv >= KERNEL_TEXT_START;
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| 87 | # endif
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| 88 |
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| 89 | #else
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| 90 | # error "PORT ME"
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| 91 | return !access_ok(VERIFY_READ, pv, 1);
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| 92 | #endif
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| 93 | }
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| 94 | RT_EXPORT_SYMBOL(RTR0MemKernelIsValidAddr);
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| 95 |
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| 96 |
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| 97 | RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
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| 98 | {
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| 99 | #if defined(RT_ARCH_X86) && defined(CONFIG_X86_HIGH_ENTRY) /* ?? */
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| 100 | return false;
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| 101 | #else
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| 102 | return true;
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| 103 | #endif
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| 104 | }
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| 105 | RT_EXPORT_SYMBOL(RTR0MemAreKrnlAndUsrDifferent);
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| 106 |
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