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/* $Id: bs3-cmn-MemGuardedTestPage.c $ */
/** @file
* BS3Kit - Bs3MemGuardedTestPageAlloc, Bs3MemGuardedTestPageFree
*/
/*
* Copyright (C) 2007-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "bs3kit-template-header.h"
#include "iprt/asm.h"
#undef Bs3MemGuardedTestPageAllocEx
BS3_CMN_PROTO_STUB(void BS3_FAR *, Bs3MemGuardedTestPageAllocEx,(BS3MEMKIND enmKind, uint64_t fPte))
{
uint8_t BS3_FAR *pb = (uint8_t BS3_FAR *)Bs3MemAlloc(enmKind, X86_PAGE_4K_SIZE * 3);
if (pb)
{
int rc;
Bs3MemSet(pb, 0xcc, X86_PAGE_4K_SIZE);
Bs3MemSet(&pb[X86_PAGE_4K_SIZE], 0x00, X86_PAGE_4K_SIZE);
Bs3MemSet(&pb[X86_PAGE_4K_SIZE*2], 0xaa, X86_PAGE_4K_SIZE);
rc = Bs3PagingProtectPtr(pb, X86_PAGE_4K_SIZE, fPte, UINT64_MAX & ~fPte);
if (RT_SUCCESS(rc))
{
rc = Bs3PagingProtectPtr(&pb[X86_PAGE_4K_SIZE*2], X86_PAGE_4K_SIZE, fPte, UINT64_MAX & ~fPte);
if (RT_SUCCESS(rc))
return pb + X86_PAGE_4K_SIZE;
Bs3TestPrintf("warning: Bs3MemGuardedTestPageAlloc - Tail protect error %d (mode %#x)\n", rc, g_bBs3CurrentMode);
Bs3PagingProtectPtr(pb, X86_PAGE_4K_SIZE, X86_PTE_P, 0);
}
else
Bs3TestPrintf("warning: Bs3MemGuardedTestPageAlloc - Head protect error %d (mode %#x)\n", rc, g_bBs3CurrentMode);
Bs3MemFree(pb, X86_PAGE_4K_SIZE * 3);
}
else
Bs3TestPrintf("warning: Bs3MemGuardedTestPageAlloc - out of memory (mode %#x)\n", g_bBs3CurrentMode);
return NULL;
}
#undef Bs3MemGuardedTestPageAlloc
BS3_CMN_DEF(void BS3_FAR *, Bs3MemGuardedTestPageAlloc,(BS3MEMKIND enmKind))
{
return BS3_CMN_FAR_NM(Bs3MemGuardedTestPageAllocEx)(enmKind, 0);
}
#undef Bs3MemGuardedTestPageFree
BS3_CMN_DEF(void, Bs3MemGuardedTestPageFree,(void BS3_FAR *pvGuardedPage))
{
if (pvGuardedPage)
{
uint8_t BS3_FAR *pbGuardViolation;
uint8_t BS3_FAR *pb = (uint8_t BS3_FAR *)pvGuardedPage - X86_PAGE_4K_SIZE;
Bs3PagingProtectPtr(pb, X86_PAGE_4K_SIZE,
X86_PTE_P | X86_PTE_RW | X86_PTE_US | X86_PTE_A | X86_PTE_D, UINT64_MAX);
Bs3PagingProtectPtr(&pb[X86_PAGE_4K_SIZE*2], X86_PAGE_4K_SIZE,
X86_PTE_P | X86_PTE_RW | X86_PTE_US | X86_PTE_A | X86_PTE_D, UINT64_MAX);
pbGuardViolation = ASMMemFirstMismatchingU8(pb, X86_PAGE_4K_SIZE, 0xcc);
if (pbGuardViolation)
Bs3TestFailedF("Leading guard page touched: byte %#05x is %#04x instead of 0xcc\n",
(unsigned)(uintptr_t)(pbGuardViolation - pb), *pbGuardViolation);
pbGuardViolation = ASMMemFirstMismatchingU8(&pb[X86_PAGE_4K_SIZE*2], X86_PAGE_4K_SIZE, 0xaa);
if (pbGuardViolation)
Bs3TestFailedF("Trailing guard page touched: byte %#05x is %#04x instead of 0xaa\n",
(unsigned)(uintptr_t)(pbGuardViolation - &pb[X86_PAGE_4K_SIZE*2]), *pbGuardViolation);
Bs3MemFree(pb, X86_PAGE_4K_SIZE * 3);
}
}
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