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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemGuardedTestPage.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemGuardedTestPage.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemGuardedTestPage.c new file mode 100644 index 00000000..7d5eb28c --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemGuardedTestPage.c @@ -0,0 +1,109 @@ +/* $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); + } +} + |