Changeset 41169 in vbox for trunk/src

Timestamp:

May 4, 2012 2:24:42 PM (13 years ago)

Author:

vboxsync

Message:

IPRT,SUPDrv: RTR0MemKernelCopyFrom/To for safe kernel memory access in debug & tracing code..

Location:

trunk/src/VBox

Files:

• HostDrivers/Support/SUPDrv.c (modified) (1 diff)
• HostDrivers/Support/SUPDrvIOC.h (modified) (1 diff)
• Runtime/r0drv/darwin/memuserkernel-r0drv-darwin.cpp (modified) (1 diff)
• Runtime/r0drv/freebsd/memuserkernel-r0drv-freebsd.c (modified) (1 diff)
• Runtime/r0drv/linux/memuserkernel-r0drv-linux.c (modified) (1 diff)
• Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp (modified) (1 diff)
• Runtime/r0drv/os2/memuserkernel-r0drv-os2.cpp (modified) (1 diff)
• Runtime/r0drv/solaris/memuserkernel-r0drv-solaris.c (modified) (1 diff)

trunk/src/VBox/HostDrivers/Support/SUPDrv.c

@@ -292 +292 @@
     { "RTR0MemAreKrnlAndUsrDifferent",          (void *)RTR0MemAreKrnlAndUsrDifferent },
     { "RTR0MemKernelIsValidAddr",               (void *)RTR0MemKernelIsValidAddr },
+    { "RTR0MemKernelCopyFrom",                  (void *)RTR0MemKernelCopyFrom },
+    { "RTR0MemKernelCopyTo",                    (void *)RTR0MemKernelCopyTo },
     { "RTR0MemObjAddress",                      (void *)RTR0MemObjAddress },
     { "RTR0MemObjAddressR3",                    (void *)RTR0MemObjAddressR3 },

trunk/src/VBox/HostDrivers/Support/SUPDrvIOC.h

@@ -194 +194 @@
  *          - Remove RTSpinlockReleaseNoInts.
  */
-#define SUPDRV_IOC_VERSION                              0x001a0003
+#define SUPDRV_IOC_VERSION                              0x001a0004
 
 /** SUP_IOCTL_COOKIE. */

trunk/src/VBox/Runtime/r0drv/darwin/memuserkernel-r0drv-darwin.cpp

@@ -99 +99 @@
 }
 
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+
+

trunk/src/VBox/Runtime/r0drv/freebsd/memuserkernel-r0drv-freebsd.c

@@ -70 +70 @@
 }
 
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+
+

trunk/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c

@@ -101 +101 @@
 RT_EXPORT_SYMBOL(RTR0MemAreKrnlAndUsrDifferent);
 
+
+/**
+ * Treats both source and destination as unsafe buffers.
+ */
+static int rtR0MemKernelCopyLnxWorker(void *pvDst, void const *pvSrc, size_t cb)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(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;
+    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"
+                          ".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");
+    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);
+

trunk/src/VBox/Runtime/r0drv/nt/memuserkernel-r0drv-nt.cpp

@@ -92 +92 @@
 }
 
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    __try
+    {
+        memcpy(pvDst, pvSrc, cb);
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        return VERR_ACCESS_DENIED;
+    }
+    return VINF_SUCCESS;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    __try
+    {
+        memcpy(pvDst, pvSrc, cb);
+    }
+    __except(EXCEPTION_EXECUTE_HANDLER)
+    {
+        return VERR_ACCESS_DENIED;
+    }
+    return VINF_SUCCESS;
+}
+

trunk/src/VBox/Runtime/r0drv/os2/memuserkernel-r0drv-os2.cpp

@@ -76 +76 @@
 }
 
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+

trunk/src/VBox/Runtime/r0drv/solaris/memuserkernel-r0drv-solaris.c

@@ -81 +81 @@
 }
 
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    int rc = kcopy(pvSrc, pvDst, cb);
+    if (RT_LIKELY(rc == 0))
+        return VINF_SUCCESS;
+    return VERR_ACCESS_DENIED;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    int rc = kcopy(pvSrc, pvDst, cb);
+    if (RT_LIKELY(rc == 0))
+        return VINF_SUCCESS;
+    return VERR_ACCESS_DENIED;
+}
+