Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 210 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp b/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp
new file mode 100644
index 00000000..5f5f5be3
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp
@@ -0,0 +1,210 @@
+/* $Id: memuserkernel-r0drv-nt.cpp $ */
+/** @file
+ * IPRT - User & Kernel Memory, Ring-0 Driver, NT.
+ */
+
+/*
+ * Copyright (C) 2009-2022 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 "the-nt-kernel.h"
+
+#include <iprt/mem.h>
+#include <iprt/errcore.h>
+
+#include "internal-r0drv-nt.h"
+
+
+RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
+{
+    __try
+    {
+        ProbeForRead((PVOID)R3PtrSrc, cb, 1);
+        memcpy(pvDst, (void const *)R3PtrSrc, cb);
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        return VERR_ACCESS_DENIED;
+    }
+    return VINF_SUCCESS;
+}
+
+
+RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
+{
+    __try
+    {
+        ProbeForWrite((PVOID)R3PtrDst, cb, 1);
+        memcpy((void *)R3PtrDst, pvSrc, cb);
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        return VERR_ACCESS_DENIED;
+    }
+    return VINF_SUCCESS;
+}
+
+
+RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
+{
+#ifdef IPRT_TARGET_NT4
+    uintptr_t const uLast = g_puRtMmHighestUserAddress ? *g_puRtMmHighestUserAddress : ~(uintptr_t)0 / 2;
+#else
+    uintptr_t const uLast = (uintptr_t)MM_HIGHEST_USER_ADDRESS;
+#endif
+    return R3Ptr <= uLast;
+}
+
+
+RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
+{
+#ifdef IPRT_TARGET_NT4
+    uintptr_t const uFirst = g_puRtMmSystemRangeStart ? *g_puRtMmSystemRangeStart : ~(uintptr_t)0 / 2 + 1;
+#else
+    uintptr_t const uFirst = (uintptr_t)MM_SYSTEM_RANGE_START;
+#endif
+    return (uintptr_t)pv >= uFirst;
+}
+
+
+RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
+{
+    return true;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    if (!RTR0MemKernelIsValidAddr((void *)pvSrc))
+        return VERR_ACCESS_DENIED;
+
+    uint8_t       *pbDst = (uint8_t *)pvDst;
+    uint8_t const *pbSrc = (uint8_t const *)pvSrc;
+
+#if 0
+    /*
+     * The try+except stuff does not work for kernel addresses.
+     */
+    __try
+    {
+        while (cb-- > 0)
+            *pbDst++ = *pbSrc++;
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        return VERR_ACCESS_DENIED;
+    }
+#else
+    /*
+     * This is the best I can come up with for now: Work page-by-page using MmIsAddressValid.
+     */
+    while (cb > 0)
+    {
+        if (!MmIsAddressValid((PVOID)pbSrc))
+            return VERR_ACCESS_DENIED;
+
+        size_t cbToCopy = (uintptr_t)pbSrc & PAGE_OFFSET_MASK;
+        if (cbToCopy > cb)
+            cbToCopy = cb;
+        cb -= cbToCopy;
+
+        __try /* doesn't work, but can't hurt, right? */
+        {
+            while (cbToCopy-- > 0)
+                *pbDst++ = *pbSrc++;
+        }
+        __except(EXCEPTION_EXECUTE_HANDLER)
+        {
+            return VERR_ACCESS_DENIED;
+        }
+    }
+#endif
+    return VINF_SUCCESS;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    if (!RTR0MemKernelIsValidAddr(pvDst))
+        return VERR_ACCESS_DENIED;
+#if 0
+    uint8_t       *pbDst = (uint8_t *)pvDst;
+    uint8_t const *pbSrc = (uint8_t const *)pvSrc;
+# if 0
+    /*
+     * The try+except stuff does not work for kernel addresses.
+     */
+    __try
+    {
+        while (cb-- > 0)
+            *pbDst++ = *pbSrc++;
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        return VERR_ACCESS_DENIED;
+    }
+
+# else
+    /*
+     * This is the best I can come up with for now: Work page-by-page using MmIsAddressValid.
+     * Note! MmIsAddressValid does not indicate that it's writable, so we're a bit buggered if it isn't...
+     */
+    while (cb > 0)
+    {
+        if (!MmIsAddressValid((PVOID)pbSrc))
+            return VERR_ACCESS_DENIED;
+
+        size_t cbToCopy = (uintptr_t)pbSrc & PAGE_OFFSET_MASK;
+        if (cbToCopy > cb)
+            cbToCopy = cb;
+        cb -= cbToCopy;
+
+        __try /* doesn't work, but can't hurt, right? */
+        {
+            while (cbToCopy-- > 0)
+                *pbDst++ = *pbSrc++;
+        }
+        __except(EXCEPTION_EXECUTE_HANDLER)
+        {
+            return VERR_ACCESS_DENIED;
+        }
+    }
+# endif
+    return VINF_SUCCESS;
+#else
+    RT_NOREF(pvDst, pvSrc, cb);
+    return VERR_NOT_SUPPORTED;
+#endif
+}
+