[75879] | 1 | /* $Id: shmem-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Named shared memory object, Windows Implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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[98103] | 7 | * Copyright (C) 2018-2023 Oracle and/or its affiliates.
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[75879] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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[75879] | 11 | *
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[96407] | 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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[75879] | 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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[96407] | 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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[75879] | 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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[96407] | 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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[75879] | 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/nt/nt-and-windows.h>
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| 42 |
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| 43 | #include <iprt/shmem.h>
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| 44 | #include "internal/iprt.h"
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| 45 |
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| 46 | #include <iprt/asm.h>
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| 47 | #include <iprt/assert.h>
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| 48 | #include <iprt/cdefs.h>
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| 49 | #include <iprt/err.h>
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| 50 | #include <iprt/mem.h>
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| 51 | #include <iprt/string.h>
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[76409] | 52 | #include <iprt/utf16.h>
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[75879] | 53 | #include "internal/magics.h"
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| 54 | #include "internal/path.h"
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| 55 | #include "internal-r3-win.h" /* For g_enmWinVer + kRTWinOSType_XXX */
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| 56 |
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| 57 | /*
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| 58 | * Define values ourselves in case the compiling host is too old.
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| 59 | * See https://docs.microsoft.com/en-us/windows/desktop/api/winbase/nf-winbase-createfilemappinga
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| 60 | * for when these were introduced.
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| 61 | */
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| 62 | #ifndef PAGE_EXECUTE_READ
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| 63 | # define PAGE_EXECUTE_READ 0x20
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| 64 | #endif
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| 65 | #ifndef PAGE_EXECUTE_READWRITE
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| 66 | # define PAGE_EXECUTE_READWRITE 0x40
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| 67 | #endif
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| 68 | #ifndef PAGE_EXECUTE_WRITECOPY
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| 69 | # define PAGE_EXECUTE_WRITECOPY 0x80
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| 70 | #endif
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| 71 | #ifndef FILE_MAP_EXECUTE
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| 72 | # define FILE_MAP_EXECUTE 0x20
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| 73 | #endif
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| 74 |
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[75883] | 75 |
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[75879] | 76 | /*********************************************************************************************************************************
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| 77 | * Structures and Typedefs *
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| 78 | *********************************************************************************************************************************/
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| 79 |
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| 80 | /**
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| 81 | * Shared memory object mapping descriptor.
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| 82 | */
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| 83 | typedef struct RTSHMEMMAPPINGDESC
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| 84 | {
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| 85 | /** Number of references held to this mapping, 0 if the descriptor is free. */
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| 86 | volatile uint32_t cMappings;
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| 87 | /** Pointer to the region mapping. */
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[75883] | 88 | void *pvMapping;
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[75879] | 89 | /** Start offset */
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| 90 | size_t offRegion;
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| 91 | /** Size of the region. */
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| 92 | size_t cbRegion;
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| 93 | /** Access flags for this region .*/
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| 94 | uint32_t fFlags;
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| 95 | } RTSHMEMMAPPINGDESC;
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| 96 | /** Pointer to a shared memory object mapping descriptor. */
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| 97 | typedef RTSHMEMMAPPINGDESC *PRTSHMEMMAPPINGDESC;
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| 98 | /** Pointer to a constant shared memory object mapping descriptor. */
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| 99 | typedef const RTSHMEMMAPPINGDESC *PCRTSHMEMMAPPINGDESC;
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Internal shared memory object state.
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| 104 | */
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| 105 | typedef struct RTSHMEMINT
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| 106 | {
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| 107 | /** Magic value (RTSHMEM_MAGIC). */
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| 108 | uint32_t u32Magic;
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[75883] | 109 | /** Flag whether this instance created the named shared memory object. */
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| 110 | bool fCreate;
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[75879] | 111 | /** Handle to the underlying mapping object. */
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| 112 | HANDLE hShmObj;
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| 113 | /** Size of the mapping object in bytes. */
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| 114 | size_t cbMax;
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| 115 | /** Overall number of mappings active for this shared memory object. */
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| 116 | volatile uint32_t cMappings;
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| 117 | /** Maximum number of mapping descriptors allocated. */
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| 118 | uint32_t cMappingDescsMax;
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| 119 | /** Number of mapping descriptors used. */
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| 120 | volatile uint32_t cMappingDescsUsed;
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| 121 | /** Array of mapping descriptors - variable in size. */
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| 122 | RTSHMEMMAPPINGDESC aMappingDescs[1];
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| 123 | } RTSHMEMINT;
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| 124 | /** Pointer to the internal shared memory object state. */
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| 125 | typedef RTSHMEMINT *PRTSHMEMINT;
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| 126 |
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| 127 |
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| 128 |
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| 129 |
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| 130 | /**
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| 131 | * Returns a mapping descriptor matching the given region properties or NULL if none was found.
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| 132 | *
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| 133 | * @returns Pointer to the matching mapping descriptor or NULL if not found.
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| 134 | * @param pThis Pointer to the shared memory object instance.
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| 135 | * @param offRegion Offset into the shared memory object to start mapping at.
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| 136 | * @param cbRegion Size of the region to map.
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| 137 | * @param fFlags Desired properties of the mapped region, combination of RTSHMEM_MAP_F_* defines.
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| 138 | */
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| 139 | DECLINLINE(PRTSHMEMMAPPINGDESC) rtShMemMappingDescFindByProp(PRTSHMEMINT pThis, size_t offRegion, size_t cbRegion, uint32_t fFlags)
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| 140 | {
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| 141 | for (uint32_t i = 0; i < pThis->cMappingDescsMax; i++)
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| 142 | {
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| 143 | if ( pThis->aMappingDescs[i].offRegion == offRegion
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| 144 | && pThis->aMappingDescs[i].cbRegion == cbRegion
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| 145 | && pThis->aMappingDescs[i].fFlags == fFlags)
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| 146 | return &pThis->aMappingDescs[i];
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| 147 | }
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| 148 |
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| 149 | return NULL;
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| 150 | }
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| 151 |
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| 152 |
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| 153 | RTDECL(int) RTShMemOpen(PRTSHMEM phShMem, const char *pszName, uint32_t fFlags, size_t cbMax, uint32_t cMappingsHint)
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| 154 | {
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| 155 | AssertPtrReturn(phShMem, VERR_INVALID_PARAMETER);
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| 156 | AssertPtrReturn(pszName, VERR_INVALID_PARAMETER);
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| 157 | AssertReturn(!(fFlags & ~RTSHMEM_O_F_VALID_MASK), VERR_INVALID_PARAMETER);
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| 158 | AssertReturn(cMappingsHint < 64, VERR_OUT_OF_RANGE);
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| 159 | AssertReturn(cbMax > 0 || !(fFlags & RTSHMEM_O_F_CREATE), VERR_NOT_SUPPORTED);
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| 160 |
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| 161 | if (fFlags & RTSHMEM_O_F_TRUNCATE)
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| 162 | return VERR_NOT_SUPPORTED;
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| 163 |
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| 164 | /*
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| 165 | * The executable access was introduced with Windows XP SP2 and Windows Server 2003 SP1,
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| 166 | * PAGE_EXECUTE_WRITECOPY was not available until Windows Vista SP1.
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| 167 | * Allow execute mappings only starting from Windows 7 to keep the checks simple here (lazy coder).
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| 168 | */
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| 169 | if ( (fFlags & RTSHMEM_O_F_MAYBE_EXEC)
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| 170 | && g_enmWinVer < kRTWinOSType_7)
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| 171 | return VERR_NOT_SUPPORTED;
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| 172 |
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| 173 | cMappingsHint = cMappingsHint == 0 ? 5 : cMappingsHint;
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| 174 | int rc = VINF_SUCCESS;
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| 175 | PRTSHMEMINT pThis = (PRTSHMEMINT)RTMemAllocZ(RT_UOFFSETOF_DYN(RTSHMEMINT, aMappingDescs[cMappingsHint]));
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| 176 | if (RT_LIKELY(pThis))
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| 177 | {
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| 178 | pThis->u32Magic = RTSHMEM_MAGIC;
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| 179 | /*pThis->fCreate = false; */
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| 180 | /*pThis->cMappings = 0; */
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| 181 | pThis->cMappingDescsMax = cMappingsHint;
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| 182 | /*pThis->cMappingDescsUsed = 0; */
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| 183 | /* Construct the filename, always use the local namespace, global requires special privileges. */
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| 184 | char szName[RTPATH_MAX];
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| 185 | ssize_t cch = RTStrPrintf2(&szName[0], sizeof(szName), "Local\\%s", pszName);
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| 186 | if (cch > 0)
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| 187 | {
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| 188 | PRTUTF16 pwszName = NULL;
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| 189 | rc = RTStrToUtf16Ex(&szName[0], RTSTR_MAX, &pwszName, 0, NULL);
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| 190 | if (RT_SUCCESS(rc))
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| 191 | {
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| 192 | if (fFlags & RTSHMEM_O_F_CREATE)
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| 193 | {
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| 194 | #if HC_ARCH_BITS == 64
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| 195 | DWORD dwSzMaxHigh = cbMax >> 32;
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| 196 | #elif HC_ARCH_BITS == 32
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| 197 | DWORD dwSzMaxHigh = 0;
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| 198 | #else
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| 199 | # error "Port me"
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| 200 | #endif
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| 201 | DWORD dwSzMaxLow = cbMax & UINT32_C(0xffffffff);
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| 202 | DWORD fProt = 0;
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| 203 |
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| 204 | if (fFlags & RTSHMEM_O_F_MAYBE_EXEC)
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| 205 | {
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| 206 | if ((fFlags & RTSHMEM_O_F_READWRITE) == RTSHMEM_O_F_READ)
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| 207 | fProt |= PAGE_EXECUTE_READ;
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| 208 | else
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| 209 | fProt |= PAGE_EXECUTE_READWRITE;
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| 210 | }
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| 211 | else
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| 212 | {
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| 213 | if ((fFlags & RTSHMEM_O_F_READWRITE) == RTSHMEM_O_F_READ)
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| 214 | fProt |= PAGE_READONLY;
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| 215 | else
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| 216 | fProt |= PAGE_READWRITE;
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| 217 | }
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| 218 | pThis->hShmObj = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL, fProt,
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| 219 | dwSzMaxHigh, dwSzMaxLow, pwszName);
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| 220 | }
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| 221 | else
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| 222 | {
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| 223 | DWORD fProt = SECTION_QUERY;
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| 224 | if (fFlags & RTSHMEM_O_F_MAYBE_EXEC)
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| 225 | fProt |= FILE_MAP_EXECUTE;
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| 226 | if (fFlags & RTSHMEM_O_F_READ)
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| 227 | fProt |= FILE_MAP_READ;
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| 228 | if (fFlags & RTSHMEM_O_F_WRITE)
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| 229 | fProt |= FILE_MAP_WRITE;
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| 230 |
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| 231 | pThis->hShmObj = OpenFileMappingW(fProt, FALSE, pwszName);
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| 232 | }
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| 233 | RTUtf16Free(pwszName);
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| 234 | if (pThis->hShmObj != NULL)
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| 235 | {
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| 236 | *phShMem = pThis;
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| 237 | return VINF_SUCCESS;
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| 238 | }
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| 239 | else
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| 240 | rc = RTErrConvertFromWin32(GetLastError());
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| 241 | }
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| 242 | }
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| 243 | else
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| 244 | rc = VERR_BUFFER_OVERFLOW;
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| 245 |
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| 246 | RTMemFree(pThis);
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| 247 | }
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| 248 | else
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| 249 | rc = VERR_NO_MEMORY;
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| 250 |
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| 251 | return rc;
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| 252 | }
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| 253 |
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| 254 |
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| 255 | RTDECL(int) RTShMemClose(RTSHMEM hShMem)
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| 256 | {
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| 257 | PRTSHMEMINT pThis = hShMem;
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| 258 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 259 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 260 | AssertReturn(!pThis->cMappings, VERR_INVALID_STATE);
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| 261 |
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| 262 | int rc = VINF_SUCCESS;
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| 263 | if (CloseHandle(pThis->hShmObj))
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| 264 | {
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| 265 | pThis->u32Magic = RTSHMEM_MAGIC_DEAD;
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| 266 | RTMemFree(pThis);
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| 267 | }
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| 268 | else
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| 269 | rc = RTErrConvertFromWin32(GetLastError());
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| 270 |
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| 271 | return rc;
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| 272 | }
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| 273 |
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| 274 |
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[78561] | 275 | RTDECL(int) RTShMemDelete(const char *pszName)
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| 276 | {
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| 277 | AssertPtrReturn(pszName, VERR_INVALID_POINTER);
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| 278 | AssertReturn(*pszName != '\0', VERR_INVALID_PARAMETER);
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| 279 |
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| 280 | return VERR_NOT_SUPPORTED;
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| 281 | }
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| 282 |
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| 283 |
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[75879] | 284 | RTDECL(uint32_t) RTShMemRefCount(RTSHMEM hShMem)
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| 285 | {
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| 286 | PRTSHMEMINT pThis = hShMem;
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| 287 | AssertPtrReturn(pThis, 0);
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| 288 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, 0);
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| 289 |
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| 290 | return pThis->cMappings;
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| 291 | }
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| 292 |
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| 293 |
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| 294 | RTDECL(int) RTShMemSetSize(RTSHMEM hShMem, size_t cbMem)
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| 295 | {
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| 296 | PRTSHMEMINT pThis = hShMem;
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| 297 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 298 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 299 | AssertReturn(!pThis->cMappings, VERR_INVALID_STATE);
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| 300 | AssertReturn(cbMem, VERR_NOT_SUPPORTED);
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| 301 |
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| 302 | return VERR_NOT_SUPPORTED;
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| 303 | }
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| 304 |
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| 305 |
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| 306 | RTDECL(int) RTShMemQuerySize(RTSHMEM hShMem, size_t *pcbMem)
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| 307 | {
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| 308 | PRTSHMEMINT pThis = hShMem;
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| 309 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 310 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 311 | AssertPtrReturn(pcbMem, VERR_INVALID_PARAMETER);
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| 312 |
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| 313 | int rc = VINF_SUCCESS;
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| 314 | SECTION_BASIC_INFORMATION SecInf;
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| 315 | SIZE_T cbRet;
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| 316 | NTSTATUS rcNt = NtQuerySection(pThis->hShmObj, SectionBasicInformation, &SecInf, sizeof(SecInf), &cbRet);
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| 317 | if (NT_SUCCESS(rcNt))
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| 318 | {
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| 319 | AssertReturn(cbRet == sizeof(SecInf), VERR_INTERNAL_ERROR);
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| 320 | #if HC_ARCH_BITS == 32
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| 321 | AssertReturn(SecInf.MaximumSize.HighPart == 0, VERR_INTERNAL_ERROR_2);
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| 322 | *pcbMem = SecInf.MaximumSize.LowPart;
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| 323 | #elif HC_ARCH_BITS == 64
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| 324 | *pcbMem = SecInf.MaximumSize.QuadPart;
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| 325 | #else
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| 326 | # error "Port me"
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| 327 | #endif
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| 328 | }
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| 329 | else
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| 330 | rc = RTErrConvertFromNtStatus(rcNt);
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| 331 |
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| 332 | return rc;
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| 333 | }
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| 334 |
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| 335 |
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| 336 | RTDECL(int) RTShMemMapRegion(RTSHMEM hShMem, size_t offRegion, size_t cbRegion, uint32_t fFlags, void **ppv)
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| 337 | {
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| 338 | PRTSHMEMINT pThis = hShMem;
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| 339 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 340 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 341 | AssertPtrReturn(ppv, VERR_INVALID_PARAMETER);
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| 342 | AssertReturn(!(fFlags & ~RTSHMEM_MAP_F_VALID_MASK), VERR_INVALID_PARAMETER);
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| 343 |
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| 344 | /* See comment in RTShMemOpen(). */
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| 345 | if ( (fFlags & RTSHMEM_MAP_F_EXEC)
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| 346 | && g_enmWinVer < kRTWinOSType_7)
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| 347 | return VERR_NOT_SUPPORTED;
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| 348 |
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| 349 | /* Try to find a mapping with compatible parameters first. */
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| 350 | PRTSHMEMMAPPINGDESC pMappingDesc = NULL;
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| 351 | for (uint32_t iTry = 0; iTry < 10; iTry++)
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| 352 | {
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| 353 | pMappingDesc = rtShMemMappingDescFindByProp(pThis, offRegion, cbRegion, fFlags);
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| 354 | if (!pMappingDesc)
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| 355 | break;
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| 356 |
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| 357 | /* Increase the mapping count and check that the region is still accessible by us. */
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| 358 | if ( ASMAtomicIncU32(&pMappingDesc->cMappings) > 1
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| 359 | && pMappingDesc->offRegion == offRegion
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| 360 | && pMappingDesc->cbRegion == cbRegion
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| 361 | && pMappingDesc->fFlags == fFlags)
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| 362 | break;
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| 363 | /* Mapping was freed inbetween, next round. */
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| 364 | }
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| 365 |
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| 366 | int rc = VINF_SUCCESS;
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| 367 | if (!pMappingDesc)
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| 368 | {
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| 369 | /* Find an empty region descriptor and map the region. */
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| 370 | for (uint32_t i = 0; i < pThis->cMappingDescsMax && !pMappingDesc; i++)
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| 371 | {
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| 372 | if (!pThis->aMappingDescs[i].cMappings)
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| 373 | {
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| 374 | pMappingDesc = &pThis->aMappingDescs[i];
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| 375 |
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| 376 | /* Try to grab this one. */
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| 377 | if (ASMAtomicIncU32(&pMappingDesc->cMappings) == 1)
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| 378 | break;
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| 379 |
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| 380 | /* Somebody raced us, drop reference and continue. */
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| 381 | ASMAtomicDecU32(&pMappingDesc->cMappings);
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| 382 | pMappingDesc = NULL;
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| 383 | }
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| 384 | }
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| 385 |
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| 386 | if (RT_LIKELY(pMappingDesc))
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| 387 | {
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| 388 | /* Try to map it. */
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| 389 | DWORD fProt = 0;
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| 390 | DWORD offLow = offRegion & UINT32_C(0xffffffff);
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| 391 | #if HC_ARCH_BITS == 64
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| 392 | DWORD offHigh = offRegion >> 32;
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| 393 | #elif HC_ARCH_BITS == 32
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| 394 | DWORD offHigh = 0;
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| 395 | #else
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| 396 | # error "Port me"
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| 397 | #endif
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| 398 | if (fFlags & RTSHMEM_MAP_F_READ)
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| 399 | fProt |= FILE_MAP_READ;
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| 400 | if (fFlags & RTSHMEM_MAP_F_WRITE)
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| 401 | fProt |= FILE_MAP_WRITE;
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| 402 | if (fFlags & RTSHMEM_MAP_F_EXEC)
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| 403 | fProt |= FILE_MAP_EXECUTE;
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| 404 | if (fFlags & RTSHMEM_MAP_F_COW)
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| 405 | fProt |= FILE_MAP_COPY;
|
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| 406 |
|
---|
| 407 | void *pv = MapViewOfFile(pThis->hShmObj, fProt, offHigh, offLow, cbRegion);
|
---|
| 408 | if (pv != NULL)
|
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| 409 | {
|
---|
| 410 | pMappingDesc->pvMapping = pv;
|
---|
| 411 | pMappingDesc->offRegion = offRegion;
|
---|
| 412 | pMappingDesc->cbRegion = cbRegion;
|
---|
| 413 | pMappingDesc->fFlags = fFlags;
|
---|
| 414 | }
|
---|
| 415 | else
|
---|
| 416 | {
|
---|
| 417 | rc = RTErrConvertFromWin32(GetLastError());
|
---|
| 418 | ASMAtomicDecU32(&pMappingDesc->cMappings);
|
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| 419 | }
|
---|
| 420 | }
|
---|
| 421 | else
|
---|
| 422 | rc = VERR_SHMEM_MAXIMUM_MAPPINGS_REACHED;
|
---|
| 423 | }
|
---|
| 424 |
|
---|
| 425 | if (RT_SUCCESS(rc))
|
---|
| 426 | {
|
---|
| 427 | *ppv = pMappingDesc->pvMapping;
|
---|
| 428 | ASMAtomicIncU32(&pThis->cMappings);
|
---|
| 429 | }
|
---|
| 430 |
|
---|
| 431 | return rc;
|
---|
| 432 | }
|
---|
| 433 |
|
---|
| 434 |
|
---|
| 435 | RTDECL(int) RTShMemUnmapRegion(RTSHMEM hShMem, void *pv)
|
---|
| 436 | {
|
---|
| 437 | PRTSHMEMINT pThis = hShMem;
|
---|
| 438 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
| 439 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
|
---|
| 440 | AssertPtrReturn(pv, VERR_INVALID_PARAMETER);
|
---|
| 441 |
|
---|
| 442 | /* Find the mapping descriptor by the given region address. */
|
---|
| 443 | PRTSHMEMMAPPINGDESC pMappingDesc = NULL;
|
---|
| 444 | for (uint32_t i = 0; i < pThis->cMappingDescsMax && !pMappingDesc; i++)
|
---|
| 445 | {
|
---|
| 446 | if (pThis->aMappingDescs[i].pvMapping == pv)
|
---|
| 447 | {
|
---|
| 448 | pMappingDesc = &pThis->aMappingDescs[i];
|
---|
| 449 | break;
|
---|
| 450 | }
|
---|
| 451 | }
|
---|
| 452 |
|
---|
| 453 | AssertPtrReturn(pMappingDesc, VERR_INVALID_PARAMETER);
|
---|
| 454 |
|
---|
| 455 | int rc = VINF_SUCCESS;
|
---|
| 456 | if (!ASMAtomicDecU32(&pMappingDesc->cMappings))
|
---|
| 457 | {
|
---|
| 458 | /* Last mapping of this region was unmapped, so do the real unmapping now. */
|
---|
| 459 | if (UnmapViewOfFile(pv))
|
---|
| 460 | {
|
---|
| 461 | ASMAtomicDecU32(&pThis->cMappingDescsUsed);
|
---|
| 462 | ASMAtomicDecU32(&pThis->cMappings);
|
---|
| 463 | }
|
---|
| 464 | else
|
---|
| 465 | {
|
---|
| 466 | ASMAtomicIncU32(&pMappingDesc->cMappings);
|
---|
| 467 | rc = RTErrConvertFromWin32(GetLastError());
|
---|
| 468 | }
|
---|
| 469 | }
|
---|
| 470 |
|
---|
| 471 | return rc;
|
---|
| 472 | }
|
---|
| 473 |
|
---|