| 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 |
|
|---|
| 52 | RTDECL(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 | }
|
|---|
