/* $Id: bs3-cmn-MemGuardedTestPage.c 62471 2016-07-22 18:04:30Z vboxsync $ */ /** @file * BS3Kit - Bs3MemGuardedTestPageAlloc, Bs3MemGuardedTestPageFree */ /* * Copyright (C) 2007-2016 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 "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); } }