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/* $Id: memuserkernel-r0drv-linux.c $ */
/** @file
* IPRT - User & Kernel Memory, Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2009 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 "the-linux-kernel.h"
#include "internal/iprt.h"
#include <iprt/mem.h>
#include <iprt/err.h>
RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
{
if (RT_LIKELY(copy_from_user(pvDst, (void *)R3PtrSrc, cb) == 0))
return VINF_SUCCESS;
return VERR_ACCESS_DENIED;
}
RT_EXPORT_SYMBOL(RTR0MemUserCopyFrom);
RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
{
if (RT_LIKELY(copy_to_user((void *)R3PtrDst, pvSrc, cb) == 0))
return VINF_SUCCESS;
return VERR_ACCESS_DENIED;
}
RT_EXPORT_SYMBOL(RTR0MemUserCopyTo);
RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
{
return access_ok(VERIFY_READ, (void *)R3Ptr, 1);
}
RT_EXPORT_SYMBOL(RTR0MemUserIsValidAddr);
RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
{
/* Couldn't find a straight forward way of doing this... */
#ifdef RT_ARCH_X86
# ifdef CONFIG_X86_HIGH_ENTRY
return true; /* ?? */
# else
return (uintptr_t)pv >= PAGE_OFFSET;
# endif
#elif defined(RT_ARCH_AMD64)
# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 11)
/* Linux 2.6.0 ... 2.6.10 set PAGE_OFFSET to 0x0000010000000000.
* Linux 2.6.11 sets PAGE_OFFSET to 0xffff810000000000.
* Linux 2.6.33 sets PAGE_OFFSET to 0xffff880000000000. */
return (uintptr_t)pv >= PAGE_OFFSET;
# else
/* Not correct (KERNEL_TEXT_START=0xffffffff80000000),
* VMALLOC_START (0xffffff0000000000) would be better */
return (uintptr_t)pv >= KERNEL_TEXT_START;
# endif
#else
# error "PORT ME"
return !access_ok(VERIFY_READ, pv, 1);
#endif
}
RT_EXPORT_SYMBOL(RTR0MemKernelIsValidAddr);
RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
{
#if defined(RT_ARCH_X86) && defined(CONFIG_X86_HIGH_ENTRY) /* ?? */
return false;
#else
return true;
#endif
}
RT_EXPORT_SYMBOL(RTR0MemAreKrnlAndUsrDifferent);
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