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/* $Id: RTMemProtect-posix.cpp $ */
/** @file
* IPRT - Memory Allocation, POSIX.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/alloc.h>
#include <iprt/assert.h>
#include <iprt/param.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
#include <errno.h>
#include <sys/mman.h>
RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW_DEF
{
/*
* Validate input.
*/
if (cb == 0)
{
AssertMsgFailed(("!cb\n"));
return VERR_INVALID_PARAMETER;
}
if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
{
AssertMsgFailed(("fProtect=%#x\n", fProtect));
return VERR_INVALID_PARAMETER;
}
/*
* Convert the flags.
*/
int fProt;
#if RTMEM_PROT_NONE == PROT_NONE \
&& RTMEM_PROT_READ == PROT_READ \
&& RTMEM_PROT_WRITE == PROT_WRITE \
&& RTMEM_PROT_EXEC == PROT_EXEC
fProt = fProtect;
#else
Assert(!RTMEM_PROT_NONE);
if (!fProtect)
fProt = PROT_NONE;
else
{
fProt = 0;
if (fProtect & RTMEM_PROT_READ)
fProt |= PROT_READ;
if (fProtect & RTMEM_PROT_WRITE)
fProt |= PROT_WRITE;
if (fProtect & RTMEM_PROT_EXEC)
fProt |= PROT_EXEC;
}
#endif
/*
* Align the request.
*/
cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
/*
* Change the page attributes.
*/
int rc = mprotect(pv, cb, fProt);
if (!rc)
return rc;
return RTErrConvertFromErrno(errno);
}
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