Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

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

1 files changed, 181 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c
new file mode 100644
index 00000000..f23bd091
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c
@@ -0,0 +1,181 @@
+/* $Id: memuserkernel-r0drv-linux.c $ */
+/** @file
+ * IPRT - User & Kernel Memory, Ring-0 Driver, Linux.
+ */
+
+/*
+ * Copyright (C) 2009-2020 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 "the-linux-kernel.h"
+#include "internal/iprt.h"
+
+#include <iprt/mem.h>
+#include <iprt/errcore.h>
+
+
+RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+    if (RT_LIKELY(copy_from_user(pvDst, (void *)R3PtrSrc, cb) == 0))
+    {
+        IPRT_LINUX_RESTORE_EFL_AC();
+        return VINF_SUCCESS;
+    }
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return VERR_ACCESS_DENIED;
+}
+RT_EXPORT_SYMBOL(RTR0MemUserCopyFrom);
+
+
+RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+    if (RT_LIKELY(copy_to_user((void *)R3PtrDst, pvSrc, cb) == 0))
+    {
+        IPRT_LINUX_RESTORE_EFL_AC();
+        return VINF_SUCCESS;
+    }
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return VERR_ACCESS_DENIED;
+}
+RT_EXPORT_SYMBOL(RTR0MemUserCopyTo);
+
+
+RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+#if RTLNX_VER_MIN(5,0,0) || RTLNX_RHEL_MIN(8,1)
+    bool fRc = access_ok((void *)R3Ptr, 1);
+#else
+    bool fRc = access_ok(VERIFY_READ, (void *)R3Ptr, 1);
+#endif
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return fRc;
+}
+RT_EXPORT_SYMBOL(RTR0MemUserIsValidAddr);
+
+
+RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
+{
+    /* Couldn't find a straight forward way of doing this... */
+#if defined(RT_ARCH_X86) && defined(CONFIG_X86_HIGH_ENTRY)
+    return true; /* ?? */
+#elif defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
+    return (uintptr_t)pv >= PAGE_OFFSET;
+#else
+# error "PORT ME"
+#if RTLNX_VER_MIN(5,0,0) || RTLNX_RHEL_MIN(8,1)
+    return !access_ok(pv, 1);
+#else
+    return !access_ok(VERIFY_READ, pv, 1);
+#endif
+#endif
+}
+RT_EXPORT_SYMBOL(RTR0MemKernelIsValidAddr);
+
+
+RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
+{
+#if defined(RT_ARCH_X86) && defined(CONFIG_X86_HIGH_ENTRY) /* ?? */
+    return false;
+#else
+    return true;
+#endif
+}
+RT_EXPORT_SYMBOL(RTR0MemAreKrnlAndUsrDifferent);
+
+
+/**
+ * Treats both source and destination as unsafe buffers.
+ */
+static int rtR0MemKernelCopyLnxWorker(void *pvDst, void const *pvSrc, size_t cb)
+{
+#if RTLNX_VER_MIN(2,5,55)
+/* _ASM_EXTABLE was introduced in 2.6.25 from what I can tell. Using #ifndef
+   here since it has to be a macro and you never know what someone might have
+   backported to an earlier kernel release. */
+# ifndef _ASM_EXTABLE
+#  if ARCH_BITS == 32
+#   define _ASM_EXTABLE(a_Instr, a_Resume) \
+    ".section __ex_table,\"a\"\n" \
+    ".balign 4\n" \
+    ".long   " #a_Instr "\n" \
+    ".long   " #a_Resume "\n" \
+    ".previous\n"
+#  else
+#   define _ASM_EXTABLE(a_Instr, a_Resume) \
+    ".section __ex_table,\"a\"\n" \
+    ".balign 8\n" \
+    ".quad   " #a_Instr "\n" \
+    ".quad   " #a_Resume "\n" \
+    ".previous\n"
+#  endif
+# endif /* !_ASM_EXTABLE */
+    int rc;
+    IPRT_LINUX_SAVE_EFL_AC(); /* paranoia */
+    if (!cb)
+        return VINF_SUCCESS;
+
+    __asm__ __volatile__ ("cld\n"
+                          "1:\n\t"
+                          "rep; movsb\n"
+                          "2:\n\t"
+                          ".section .fixup,\"ax\"\n"
+                          "3:\n\t"
+                          "movl %4, %0\n\t"
+                          "jmp 2b\n\t"
+                          ".previous\n"
+                          _ASM_EXTABLE(1b, 3b)
+                          : "=r" (rc),
+                            "=D" (pvDst),
+                            "=S" (pvSrc),
+                            "=c" (cb)
+                          : "i" (VERR_ACCESS_DENIED),
+                            "0" (VINF_SUCCESS),
+                            "1" (pvDst),
+                            "2" (pvSrc),
+                            "3" (cb)
+                          : "memory");
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return rc;
+#else
+    return VERR_NOT_SUPPORTED;
+#endif
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return rtR0MemKernelCopyLnxWorker(pvDst, pvSrc, cb);
+}
+RT_EXPORT_SYMBOL(RTR0MemKernelCopyFrom);
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return rtR0MemKernelCopyLnxWorker(pvDst, pvSrc, cb);
+}
+RT_EXPORT_SYMBOL(RTR0MemKernelCopyTo);
+