[sginsberg] 69539: [NTOS] Isolate KD a bit by replacing Rtl* memory routines with internal versions. Lets one put breakpoints inside kernel memcpy/memset without making KD very, very sad. Fix MmDbg...
15 Oct
2015
15 Oct
'15
12:56 p.m.
Author: sginsberg
Date: Thu Oct 15 12:56:19 2015
New Revision: 69539
URL: http://svn.reactos.org/svn/reactos?rev=69539&view=rev
Log:
[NTOS]
Isolate KD a bit by replacing Rtl* memory routines with internal versions. Lets one put
breakpoints inside kernel memcpy/memset without making KD very, very sad. Fix
MmDbgCopyMemory to also not use RtlCopyMemory -- there is no need for it since it only
performs 1-to-8 byte copies anyway. Minor fixes in the print/prompt routines.
Modified:
trunk/reactos/ntoskrnl/include/internal/kd64.h
trunk/reactos/ntoskrnl/kd64/kdapi.c
trunk/reactos/ntoskrnl/kd64/kdprint.c
trunk/reactos/ntoskrnl/kd64/kdtrap.c
trunk/reactos/ntoskrnl/mm/ARM3/session.c
Modified: trunk/reactos/ntoskrnl/include/internal/kd64.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/…
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/kd64.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/include/internal/kd64.h [iso-8859-1] Thu Oct 15 12:56:19 2015
@@ -349,6 +349,24 @@
IN ULONG ChunkSize,
IN ULONG Flags,
OUT PULONG ActualSize OPTIONAL
+);
+
+//
+// Internal memory handling routines for KD isolation
+//
+VOID
+NTAPI
+KdpMoveMemory(
+ IN PVOID Destination,
+ IN PVOID Source,
+ IN SIZE_T Length
+);
+
+VOID
+NTAPI
+KdpZeroMemory(
+ IN PVOID Destination,
+ IN SIZE_T Length
);
//
Modified: trunk/reactos/ntoskrnl/kd64/kdapi.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kd64/kdapi.c?rev=…
==============================================================================
--- trunk/reactos/ntoskrnl/kd64/kdapi.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/kd64/kdapi.c [iso-8859-1] Thu Oct 15 12:56:19 2015
@@ -14,6 +14,32 @@
#include <debug.h>
/* PRIVATE FUNCTIONS *********************************************************/
+
+VOID
+NTAPI
+KdpMoveMemory(IN PVOID Destination,
+ IN PVOID Source,
+ IN SIZE_T Length)
+{
+ PCHAR DestinationBytes, SourceBytes;
+
+ /* Copy the buffers 1 byte at a time */
+ DestinationBytes = Destination;
+ SourceBytes = Source;
+ while (Length--) *DestinationBytes++ = *SourceBytes++;
+}
+
+VOID
+NTAPI
+KdpZeroMemory(IN PVOID Destination,
+ IN SIZE_T Length)
+{
+ PCHAR DestinationBytes;
+
+ /* Zero the buffer 1 byte at a time */
+ DestinationBytes = Destination;
+ while (Length--) *DestinationBytes++ = 0;
+}
NTSTATUS
NTAPI
@@ -368,7 +394,7 @@
WaitStateChange->ProgramCounter = (ULONG64)(LONG_PTR)KeGetContextPc(Context);
/* Zero out the entire Control Report */
- RtlZeroMemory(&WaitStateChange->AnyControlReport,
+ KdpZeroMemory(&WaitStateChange->AnyControlReport,
sizeof(DBGKD_ANY_CONTROL_REPORT));
/* Now copy the instruction stream and set the count */
@@ -402,7 +428,9 @@
KdpSysGetVersion(IN PDBGKD_GET_VERSION64 Version)
{
/* Copy the version block */
- RtlCopyMemory(Version, &KdVersionBlock, sizeof(DBGKD_GET_VERSION64));
+ KdpMoveMemory(Version,
+ &KdVersionBlock,
+ sizeof(DBGKD_GET_VERSION64));
}
VOID
@@ -711,7 +739,9 @@
}
/* Copy it over to the debugger */
- RtlCopyMemory(Data->Buffer, TargetContext, sizeof(CONTEXT));
+ KdpMoveMemory(Data->Buffer,
+ TargetContext,
+ sizeof(CONTEXT));
Data->Length = sizeof(CONTEXT);
/* Let the debugger set the context now */
@@ -765,7 +795,9 @@
}
/* Copy the new context to it */
- RtlCopyMemory(TargetContext, Data->Buffer, sizeof(CONTEXT));
+ KdpMoveMemory(TargetContext,
+ Data->Buffer,
+ sizeof(CONTEXT));
/* Finish up */
State->ReturnStatus = STATUS_SUCCESS;
@@ -819,7 +851,7 @@
}
/* Copy what is requested */
- RtlCopyMemory(Data->Buffer,
+ KdpMoveMemory(Data->Buffer,
(PVOID)((ULONG_PTR)TargetContext + ContextEx->Offset),
ContextEx->ByteCount);
@@ -883,7 +915,7 @@
}
/* Copy what is requested */
- RtlCopyMemory((PVOID)((ULONG_PTR)TargetContext + ContextEx->Offset),
+ KdpMoveMemory((PVOID)((ULONG_PTR)TargetContext + ContextEx->Offset),
Data->Buffer,
ContextEx->ByteCount);
@@ -1639,7 +1671,7 @@
KdpSetContextState(&WaitStateChange, Context);
/* Clear the command string structure */
- RtlZeroMemory(&WaitStateChange.u.CommandString,
+ KdpZeroMemory(&WaitStateChange.u.CommandString,
sizeof(DBGKD_COMMAND_STRING));
/* Normalize name string to max */
@@ -1709,15 +1741,22 @@
/* Build the architecture common parts of the message */
KdpSetCommonState(DbgKdExceptionStateChange, Context, &WaitStateChange);
- /* Copy the Exception Record and set First Chance flag */
#if !defined(_WIN64)
+
+ /* Convert it and copy it over */
ExceptionRecord32To64((PEXCEPTION_RECORD32)ExceptionRecord,
&WaitStateChange.u.Exception.ExceptionRecord);
+
#else
- RtlCopyMemory(&WaitStateChange.u.Exception.ExceptionRecord,
+
+ /* Just copy it directly, no need to convert */
+ KdpMoveMemory(&WaitStateChange.u.Exception.ExceptionRecord,
ExceptionRecord,
sizeof(EXCEPTION_RECORD));
+
#endif
+
+ /* Set the First Chance flag */
WaitStateChange.u.Exception.FirstChance = !SecondChanceException;
/* Now finish creating the structure */
Modified: trunk/reactos/ntoskrnl/kd64/kdprint.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kd64/kdprint.c?re…
==============================================================================
--- trunk/reactos/ntoskrnl/kd64/kdprint.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/kd64/kdprint.c [iso-8859-1] Thu Oct 15 12:56:19 2015
@@ -21,12 +21,15 @@
{
STRING Data, Header;
DBGKD_DEBUG_IO DebugIo;
- USHORT Length = Output->Length;
+ USHORT Length;
/* Copy the string */
- RtlMoveMemory(KdpMessageBuffer, Output->Buffer, Length);
+ KdpMoveMemory(KdpMessageBuffer,
+ Output->Buffer,
+ Output->Length);
/* Make sure we don't exceed the KD Packet size */
+ Length = Output->Length;
if ((sizeof(DBGKD_DEBUG_IO) + Length) > PACKET_MAX_SIZE)
{
/* Normalize length */
@@ -59,15 +62,16 @@
{
STRING Data, Header;
DBGKD_DEBUG_IO DebugIo;
- ULONG Length = PromptString->Length;
+ ULONG Length;
KDSTATUS Status;
/* Copy the string to the message buffer */
- RtlCopyMemory(KdpMessageBuffer,
+ KdpMoveMemory(KdpMessageBuffer,
PromptString->Buffer,
PromptString->Length);
/* Make sure we don't exceed the KD Packet size */
+ Length = PromptString->Length;
if ((sizeof(DBGKD_DEBUG_IO) + Length) > PACKET_MAX_SIZE)
{
/* Normalize length */
@@ -84,7 +88,7 @@
Header.Buffer = (PCHAR)&DebugIo;
/* Build the data */
- Data.Length = PromptString->Length;
+ Data.Length = Length;
Data.Buffer = KdpMessageBuffer;
/* Send the packet */
@@ -111,10 +115,13 @@
} while (Status != KdPacketReceived);
/* Don't copy back a larger response than there is room for */
- Length = min(Length, ResponseString->MaximumLength);
+ Length = min(Length,
+ ResponseString->MaximumLength);
/* Copy back the string and return the length */
- RtlCopyMemory(ResponseString->Buffer, KdpMessageBuffer, Length);
+ KdpMoveMemory(ResponseString->Buffer,
+ KdpMessageBuffer,
+ Length);
ResponseString->Length = (USHORT)Length;
/* Success; we don't need to resend */
@@ -141,7 +148,7 @@
/* Save the CPU Control State and save the context */
KiSaveProcessorControlState(&Prcb->ProcessorState);
- RtlCopyMemory(&Prcb->ProcessorState.ContextFrame,
+ KdpMoveMemory(&Prcb->ProcessorState.ContextFrame,
ContextRecord,
sizeof(CONTEXT));
@@ -151,7 +158,7 @@
&Prcb->ProcessorState.ContextFrame);
/* Restore the processor state */
- RtlCopyMemory(ContextRecord,
+ KdpMoveMemory(ContextRecord,
&Prcb->ProcessorState.ContextFrame,
sizeof(CONTEXT));
KiRestoreProcessorControlState(&Prcb->ProcessorState);
@@ -181,7 +188,7 @@
/* Save the CPU Control State and save the context */
KiSaveProcessorControlState(&Prcb->ProcessorState);
- RtlCopyMemory(&Prcb->ProcessorState.ContextFrame,
+ KdpMoveMemory(&Prcb->ProcessorState.ContextFrame,
ContextRecord,
sizeof(CONTEXT));
@@ -192,7 +199,7 @@
&Prcb->ProcessorState.ContextFrame);
/* Restore the processor state */
- RtlCopyMemory(ContextRecord,
+ KdpMoveMemory(ContextRecord,
&Prcb->ProcessorState.ContextFrame,
sizeof(CONTEXT));
KiRestoreProcessorControlState(&Prcb->ProcessorState);
@@ -216,38 +223,48 @@
PVOID CapturedPrompt, CapturedResponse;
/* Normalize the lengths */
- PromptLength = min(PromptLength, 512);
- MaximumResponseLength = min(MaximumResponseLength, 512);
+ PromptLength = min(PromptLength,
+ 512);
+ MaximumResponseLength = min(MaximumResponseLength,
+ 512);
/* Check if we need to verify the string */
if (PreviousMode != KernelMode)
{
- /* Capture user-mode buffers */
+ /* Handle user-mode buffers safely */
_SEH2_TRY
{
- ProbeForRead(PromptString, PromptLength, 1);
- CapturedPrompt = alloca(512);
- RtlMoveMemory(CapturedPrompt, PromptString, PromptLength);
+ /* Probe the prompt */
+ ProbeForRead(PromptString,
+ PromptLength,
+ 1);
+
+ /* Capture prompt */
+ CapturedPrompt = _alloca(PromptLength);
+ KdpMoveMemory(CapturedPrompt,
+ PromptString,
+ PromptLength);
PromptString = CapturedPrompt;
- ProbeForWrite(ResponseString, MaximumResponseLength, 1);
- CapturedResponse = alloca(512);
+ /* Probe and make room for response */
+ ProbeForWrite(ResponseString,
+ MaximumResponseLength,
+ 1);
+ CapturedResponse = _alloca(MaximumResponseLength);
+ ResponseString = CapturedResponse;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
+ /* Bad string pointer, bail out */
_SEH2_YIELD(return 0);
}
_SEH2_END;
- }
- else
- {
- CapturedResponse = ResponseString;
}
/* Setup the prompt and response buffers */
PromptBuffer.Buffer = PromptString;
PromptBuffer.Length = PromptLength;
- ResponseBuffer.Buffer = CapturedResponse;
+ ResponseBuffer.Buffer = ResponseString;
ResponseBuffer.Length = 0;
ResponseBuffer.MaximumLength = MaximumResponseLength;
@@ -274,10 +291,14 @@
{
_SEH2_TRY
{
- RtlMoveMemory(ResponseString, ResponseBuffer.Buffer, ResponseBuffer.Length);
+ /* Safely copy back response to user mode */
+ KdpMoveMemory(ResponseString,
+ ResponseBuffer.Buffer,
+ ResponseBuffer.Length);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
+ /* String became invalid after we exited, fail */
_SEH2_YIELD(return 0);
}
_SEH2_END;
@@ -326,13 +347,21 @@
/* Capture user-mode buffers */
_SEH2_TRY
{
- ProbeForRead(String, Length, 1);
- CapturedString = alloca(512);
- RtlMoveMemory(CapturedString, String, Length);
+ /* Probe the string */
+ ProbeForRead(String,
+ Length,
+ 1);
+
+ /* Capture it */
+ CapturedString = alloca(Length);
+ KdpMoveMemory(CapturedString,
+ String,
+ Length);
String = CapturedString;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
+ /* Bad pointer, fail the print */
_SEH2_YIELD(return STATUS_ACCESS_VIOLATION);
}
_SEH2_END;
Modified: trunk/reactos/ntoskrnl/kd64/kdtrap.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kd64/kdtrap.c?rev…
==============================================================================
--- trunk/reactos/ntoskrnl/kd64/kdtrap.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/kd64/kdtrap.c [iso-8859-1] Thu Oct 15 12:56:19 2015
@@ -58,13 +58,14 @@
{
BOOLEAN Enable, Handled;
PKPRCB Prcb;
- NTSTATUS ExceptionCode = ExceptionRecord->ExceptionCode;
+ NTSTATUS ExceptionCode;
/*
* Determine whether to pass the exception to the debugger.
* First, check if this is a "debug exception", meaning breakpoint
* (including debug service), single step and assertion failure exceptions.
*/
+ ExceptionCode = ExceptionRecord->ExceptionCode;
if ((ExceptionCode == STATUS_BREAKPOINT) ||
(ExceptionCode == STATUS_SINGLE_STEP) ||
(ExceptionCode == STATUS_ASSERTION_FAILURE))
@@ -92,8 +93,8 @@
else if (SecondChanceException == FALSE)
{
/*
- * This isn't a debug exception and the stop-on-exception flag isn't
- * set, so don't bother
+ * This isn't a debug exception and the stop-on-exception flag isn't
set,
+ * so don't bother handling it
*/
return FALSE;
}
@@ -107,7 +108,7 @@
*/
Prcb = KeGetCurrentPrcb();
KiSaveProcessorControlState(&Prcb->ProcessorState);
- RtlCopyMemory(&Prcb->ProcessorState.ContextFrame,
+ KdpMoveMemory(&Prcb->ProcessorState.ContextFrame,
ContextRecord,
sizeof(CONTEXT));
@@ -118,7 +119,7 @@
SecondChanceException);
/* Now restore the processor state, manually again. */
- RtlCopyMemory(ContextRecord,
+ KdpMoveMemory(ContextRecord,
&Prcb->ProcessorState.ContextFrame,
sizeof(CONTEXT));
KiRestoreProcessorControlState(&Prcb->ProcessorState);
@@ -138,7 +139,7 @@
IN KPROCESSOR_MODE PreviousMode,
IN BOOLEAN SecondChanceException)
{
- BOOLEAN Unload = FALSE;
+ BOOLEAN Unload;
ULONG_PTR ProgramCounter;
BOOLEAN Handled;
NTSTATUS ReturnStatus;
@@ -156,6 +157,7 @@
ProgramCounter = KeGetContextPc(ContextRecord);
/* Check what kind of operation was requested from us */
+ Unload = FALSE;
switch (ExceptionRecord->ExceptionInformation[0])
{
/* DbgPrint */
@@ -164,27 +166,24 @@
/* Call the worker routine */
ReturnStatus = KdpPrint((ULONG)KdpGetParameterThree(ContextRecord),
(ULONG)KdpGetParameterFour(ContextRecord),
- (LPSTR)ExceptionRecord->
- ExceptionInformation[1],
- (USHORT)ExceptionRecord->
- ExceptionInformation[2],
+
(LPSTR)ExceptionRecord->ExceptionInformation[1],
+
(USHORT)ExceptionRecord->ExceptionInformation[2],
PreviousMode,
TrapFrame,
ExceptionFrame,
&Handled);
/* Update the return value for the caller */
- KeSetContextReturnRegister(ContextRecord, ReturnStatus);
+ KeSetContextReturnRegister(ContextRecord,
+ ReturnStatus);
break;
/* DbgPrompt */
case BREAKPOINT_PROMPT:
/* Call the worker routine */
- ReturnLength = KdpPrompt((LPSTR)ExceptionRecord->
- ExceptionInformation[1],
- (USHORT)ExceptionRecord->
- ExceptionInformation[2],
+ ReturnLength =
KdpPrompt((LPSTR)ExceptionRecord->ExceptionInformation[1],
+
(USHORT)ExceptionRecord->ExceptionInformation[2],
(LPSTR)KdpGetParameterThree(ContextRecord),
(USHORT)KdpGetParameterFour(ContextRecord),
PreviousMode,
@@ -276,9 +275,10 @@
IN KPROCESSOR_MODE PreviousMode,
IN BOOLEAN SecondChanceException)
{
- ULONG_PTR ExceptionCommand = ExceptionRecord->ExceptionInformation[0];
+ ULONG_PTR ExceptionCommand;
/* Check if this was a breakpoint due to DbgPrint or Load/UnloadSymbols */
+ ExceptionCommand = ExceptionRecord->ExceptionInformation[0];
if ((ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT) &&
(ExceptionRecord->NumberParameters > 0) &&
((ExceptionCommand == BREAKPOINT_LOAD_SYMBOLS) ||
Modified: trunk/reactos/ntoskrnl/mm/ARM3/session.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/session.c…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/session.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/session.c [iso-8859-1] Thu Oct 15 12:56:19 2015
@@ -42,6 +42,14 @@
/* Initialize the list heads */
InitializeListHead(&MiSessionWsList);
InitializeListHead(&MmWorkingSetExpansionHead);
+}
+
+BOOLEAN
+NTAPI
+MmIsSessionAddress(IN PVOID Address)
+{
+ /* Check if it is in range */
+ return MI_IS_SESSION_ADDRESS(Address) ? TRUE : FALSE;
}
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