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);
+    }
+}
+