VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/RTMemProtect-posix.cpp@ 103795

Last change on this file since 103795 was 100310, checked in by vboxsync, 18 months ago

Runtime/r3/posix: Replace occurences of PAGE_SIZE/PAGE_OFFSET_MASK with RTSystemGetPageSize()/RTSystemGetPageOffsetMask() in code which is used by the linux.arm64 guest additions, bugref:10476

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1/* $Id: RTMemProtect-posix.cpp 100310 2023-06-28 10:26:46Z vboxsync $ */
2/** @file
3 * IPRT - Memory Allocation, POSIX.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include <iprt/alloc.h>
42#include <iprt/assert.h>
43#include <iprt/param.h>
44#include <iprt/errcore.h>
45#include <iprt/string.h>
46#include <iprt/system.h>
47
48#include <errno.h>
49#include <sys/mman.h>
50
51
52RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW_DEF
53{
54 /*
55 * Validate input.
56 */
57 if (cb == 0)
58 {
59 AssertMsgFailed(("!cb\n"));
60 return VERR_INVALID_PARAMETER;
61 }
62 if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
63 {
64 AssertMsgFailed(("fProtect=%#x\n", fProtect));
65 return VERR_INVALID_PARAMETER;
66 }
67
68 /*
69 * Convert the flags.
70 */
71 int fProt;
72#if RTMEM_PROT_NONE == PROT_NONE \
73 && RTMEM_PROT_READ == PROT_READ \
74 && RTMEM_PROT_WRITE == PROT_WRITE \
75 && RTMEM_PROT_EXEC == PROT_EXEC
76 fProt = fProtect;
77#else
78 Assert(!RTMEM_PROT_NONE);
79 if (!fProtect)
80 fProt = PROT_NONE;
81 else
82 {
83 fProt = 0;
84 if (fProtect & RTMEM_PROT_READ)
85 fProt |= PROT_READ;
86 if (fProtect & RTMEM_PROT_WRITE)
87 fProt |= PROT_WRITE;
88 if (fProtect & RTMEM_PROT_EXEC)
89 fProt |= PROT_EXEC;
90 }
91#endif
92
93 /*
94 * Align the request.
95 */
96 cb += (uintptr_t)pv & RTSystemGetPageOffsetMask();
97 pv = (void *)((uintptr_t)pv & ~RTSystemGetPageOffsetMask());
98
99 /*
100 * Change the page attributes.
101 */
102 int rc = mprotect(pv, cb, fProt);
103 if (!rc)
104 return rc;
105 return RTErrConvertFromErrno(errno);
106}
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