| 1 | /* $Id: alloc-win.cpp 101143 2023-09-18 11:15:59Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, Windows.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 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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| 11 | *
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| 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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| 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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| 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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| 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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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 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 | #ifdef IPRT_NO_CRT
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| 42 | # define USE_VIRTUAL_ALLOC
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| 43 | #endif
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| 44 | #define LOG_GROUP RTLOGGROUP_MEM
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| 45 | #include <iprt/win/windows.h>
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| 46 |
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| 47 | #include <iprt/alloc.h>
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| 48 | #include <iprt/assert.h>
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| 49 | #include <iprt/param.h>
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| 50 | #include <iprt/string.h>
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| 51 | #include <iprt/errcore.h>
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| 52 |
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| 53 | #ifndef USE_VIRTUAL_ALLOC
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| 54 | # include <malloc.h>
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| 55 | #endif
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| 56 |
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| 57 |
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| 58 | /** @todo merge the page alloc code with the heap-based mmap stuff as
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| 59 | * _aligned_malloc just isn't well suited for exec. */
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| 60 |
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| 61 |
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| 62 | RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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| 63 | {
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| 64 | RT_NOREF_PV(pszTag);
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| 65 |
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| 66 | #ifdef USE_VIRTUAL_ALLOC
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| 67 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
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| 68 | #else
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| 69 | void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE);
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| 70 | #endif
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| 71 | AssertMsg(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()));
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| 72 | return pv;
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| 73 | }
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| 74 |
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| 75 |
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| 76 | RTDECL(void *) RTMemPageAllocExTag(size_t cb, uint32_t fFlags, const char *pszTag) RT_NO_THROW_DEF
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| 77 | {
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| 78 | size_t const cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 79 | RT_NOREF_PV(pszTag);
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| 80 | AssertReturn(!(fFlags & ~RTMEMPAGEALLOC_F_VALID_MASK), NULL);
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| 81 |
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| 82 | #ifdef USE_VIRTUAL_ALLOC
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| 83 | void *pv = VirtualAlloc(NULL, cbAligned, MEM_COMMIT,
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| 84 | !(fFlags & RTMEMPAGEALLOC_F_EXECUTABLE) ? PAGE_READWRITE : PAGE_EXECUTE_READWRITE);
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| 85 | #else
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| 86 | void *pv = _aligned_malloc(cbAligned, PAGE_SIZE);
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| 87 | #endif
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| 88 | AssertMsgReturn(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()), NULL);
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| 89 |
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| 90 | #ifdef USE_VIRTUAL_ALLOC
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| 91 | if (fFlags & RTMEMPAGEALLOC_F_EXECUTABLE)
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| 92 | {
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| 93 | DWORD fIgn = 0;
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| 94 | BOOL const fRc = VirtualProtect(pv, cbAligned, PAGE_EXECUTE_READWRITE, &fIgn);
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| 95 | AssertMsgReturnStmt(fRc, ("%p LB %#zx: %#u\n", pv, cbAligned, GetLastError()), _aligned_free(pv), NULL);
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| 96 | }
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| 97 | #endif
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| 98 |
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| 99 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
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| 100 | {
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| 101 | /** @todo check why we get ERROR_WORKING_SET_QUOTA here. */
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| 102 | BOOL const fOkay = VirtualLock(pv, cbAligned);
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| 103 | AssertMsg(fOkay || GetLastError() == ERROR_WORKING_SET_QUOTA, ("pv=%p cb=%d lasterr=%d\n", pv, cb, GetLastError()));
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| 104 | NOREF(fOkay);
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| 105 | }
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| 106 |
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| 107 | if (fFlags & RTMEMPAGEALLOC_F_ZERO)
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| 108 | RT_BZERO(pv, cbAligned);
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| 109 |
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| 110 | return pv;
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| 111 | }
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| 112 |
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| 113 |
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| 114 | RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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| 115 | {
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| 116 | RT_NOREF_PV(pszTag);
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| 117 |
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| 118 | #ifdef USE_VIRTUAL_ALLOC
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| 119 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
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| 120 | #else
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| 121 | void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE);
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| 122 | #endif
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| 123 | if (pv)
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| 124 | {
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| 125 | memset(pv, 0, RT_ALIGN_Z(cb, PAGE_SIZE));
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| 126 | return pv;
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| 127 | }
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| 128 | AssertMsgFailed(("cb=%d lasterr=%d\n", cb, GetLastError()));
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| 129 | return NULL;
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| 130 | }
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| 131 |
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| 132 |
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| 133 | RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF
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| 134 | {
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| 135 | RT_NOREF_PV(cb);
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| 136 |
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| 137 | if (pv)
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| 138 | {
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| 139 | #ifdef USE_VIRTUAL_ALLOC
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| 140 | if (!VirtualFree(pv, 0, MEM_RELEASE))
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| 141 | AssertMsgFailed(("pv=%p lasterr=%d\n", pv, GetLastError()));
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| 142 | #else
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| 143 | /** @todo The exec version of this doesn't really work well... */
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| 144 | MEMORY_BASIC_INFORMATION MemInfo = { NULL };
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| 145 | SIZE_T cbRet = VirtualQuery(pv, &MemInfo, cb);
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| 146 | Assert(cbRet > 0);
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| 147 | if (cbRet > 0 && MemInfo.Protect == PAGE_EXECUTE_READWRITE)
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| 148 | {
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| 149 | DWORD fIgn = 0;
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| 150 | BOOL const fRc = VirtualProtect(pv, cb, PAGE_READWRITE, &fIgn);
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| 151 | Assert(fRc); RT_NOREF(fRc);
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| 152 | }
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| 153 | _aligned_free(pv);
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| 154 | #endif
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| 155 | }
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| 156 | }
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| 157 |
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| 158 |
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| 159 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW_DEF
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| 160 | {
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| 161 | /*
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| 162 | * Validate input.
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| 163 | */
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| 164 | if (cb == 0)
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| 165 | {
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| 166 | AssertMsgFailed(("!cb\n"));
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| 167 | return VERR_INVALID_PARAMETER;
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| 168 | }
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| 169 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 170 | {
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| 171 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 172 | return VERR_INVALID_PARAMETER;
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| 173 | }
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| 174 |
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| 175 | /*
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| 176 | * Convert the flags.
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| 177 | */
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| 178 | int fProt;
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| 179 | Assert(!RTMEM_PROT_NONE);
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| 180 | switch (fProtect & (RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 181 | {
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| 182 | case RTMEM_PROT_NONE:
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| 183 | fProt = PAGE_NOACCESS;
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| 184 | break;
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| 185 |
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| 186 | case RTMEM_PROT_READ:
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| 187 | fProt = PAGE_READONLY;
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| 188 | break;
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| 189 |
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| 190 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE:
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| 191 | fProt = PAGE_READWRITE;
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| 192 | break;
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| 193 |
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| 194 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
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| 195 | fProt = PAGE_EXECUTE_READWRITE;
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| 196 | break;
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| 197 |
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| 198 | case RTMEM_PROT_READ | RTMEM_PROT_EXEC:
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| 199 | fProt = PAGE_EXECUTE_READWRITE;
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| 200 | break;
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| 201 |
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| 202 | case RTMEM_PROT_WRITE:
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| 203 | fProt = PAGE_READWRITE;
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| 204 | break;
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| 205 |
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| 206 | case RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
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| 207 | fProt = PAGE_EXECUTE_READWRITE;
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| 208 | break;
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| 209 |
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| 210 | case RTMEM_PROT_EXEC:
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| 211 | fProt = PAGE_EXECUTE_READWRITE;
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| 212 | break;
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| 213 |
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| 214 | /* If the compiler had any brains it would warn about this case. */
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| 215 | default:
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| 216 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 217 | return VERR_INTERNAL_ERROR;
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| 218 | }
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| 219 |
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| 220 | /*
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| 221 | * Align the request.
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| 222 | */
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| 223 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
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| 224 | pv = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
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| 225 |
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| 226 | /*
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| 227 | * Change the page attributes.
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| 228 | */
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| 229 | DWORD fFlags = 0;
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| 230 | if (VirtualProtect(pv, cb, fProt, &fFlags))
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| 231 | return VINF_SUCCESS;
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| 232 | return RTErrConvertFromWin32(GetLastError());
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| 233 | }
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| 234 |
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