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[NTDLL/CSRSRV]

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Re-fix part of the capture-buffer offset setting, based on what I understood from all my previous investigations. It reverts a little part of r57673 but fixing some existing bugs there.

svn path=/branches/ros-csrss/; revision=57809
This commit is contained in:
Hermès Bélusca-Maïto 2012-12-06 22:24:27 +00:00
parent 190ce5ba55
commit 5127a493a3
2 changed files with 54 additions and 32 deletions
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25
dll/ntdll/csr/connect.c
View file

@ -51,7 +51,8 @@ CsrClientCallServer(IN OUT PCSR_API_MESSAGE ApiMessage,
IN ULONG DataLength)
{
NTSTATUS Status;
ULONG i;
ULONG PointerCount;
PULONG_PTR OffsetPointer;
/* Fill out the Port Message Header. */
ApiMessage->Header.u2.ZeroInit = 0;
@ -90,13 +91,16 @@ CsrClientCallServer(IN OUT PCSR_API_MESSAGE ApiMessage,
* a server pointer, and each pointer to these message pointers
* is converted into an offset.
*/
for (i = 0 ; i < CaptureBuffer->PointerCount ; ++i)
PointerCount = CaptureBuffer->PointerCount;
OffsetPointer = CaptureBuffer->PointerOffsetsArray;
while (PointerCount--)
{
if (CaptureBuffer->PointerOffsetsArray[i] != 0)
if (*OffsetPointer != 0)
{
*(PULONG_PTR)CaptureBuffer->PointerOffsetsArray[i] += CsrPortMemoryDelta;
CaptureBuffer->PointerOffsetsArray[i] -= (ULONG_PTR)ApiMessage;
*(PULONG_PTR)*OffsetPointer += CsrPortMemoryDelta;
*OffsetPointer -= (ULONG_PTR)ApiMessage;
}
++OffsetPointer;
}
}
@ -120,13 +124,16 @@ CsrClientCallServer(IN OUT PCSR_API_MESSAGE ApiMessage,
* pointers, and convert back these message server pointers
* into client pointers.
*/
for (i = 0 ; i < CaptureBuffer->PointerCount ; ++i)
PointerCount = CaptureBuffer->PointerCount;
OffsetPointer = CaptureBuffer->PointerOffsetsArray;
while (PointerCount--)
{
if (CaptureBuffer->PointerOffsetsArray[i] != 0)
if (*OffsetPointer != 0)
{
CaptureBuffer->PointerOffsetsArray[i] += (ULONG_PTR)ApiMessage;
*(PULONG_PTR)CaptureBuffer->PointerOffsetsArray[i] -= CsrPortMemoryDelta;
*OffsetPointer += (ULONG_PTR)ApiMessage;
*(PULONG_PTR)*OffsetPointer -= CsrPortMemoryDelta;
}
++OffsetPointer;
}
}

61
subsystems/win32/csrsrv/api.c
View file

@ -1125,7 +1125,9 @@ CsrCaptureArguments(IN PCSR_THREAD CsrThread,
PCSR_CAPTURE_BUFFER LocalCaptureBuffer = NULL, RemoteCaptureBuffer = NULL;
SIZE_T BufferDistance;
ULONG Length = 0;
ULONG i;
ULONG PointerCount;
PULONG_PTR OffsetPointer;
ULONG_PTR CurrentOffset;
/* Use SEH to make sure this is valid */
_SEH2_TRY
@ -1182,19 +1184,23 @@ CsrCaptureArguments(IN PCSR_THREAD CsrThread,
* All the pointer offsets correspond to pointers which point
* to the remote data buffer instead of the local one.
*/
for (i = 0 ; i < RemoteCaptureBuffer->PointerCount ; ++i)
PointerCount = RemoteCaptureBuffer->PointerCount;
OffsetPointer = RemoteCaptureBuffer->PointerOffsetsArray;
while (PointerCount--)
{
if (RemoteCaptureBuffer->PointerOffsetsArray[i] != 0)
CurrentOffset = *OffsetPointer;
if (CurrentOffset != 0)
{
/* Temporarily transform the offset into a pointer */
RemoteCaptureBuffer->PointerOffsetsArray[i] += (ULONG_PTR)ApiMessage;
/* Get the pointer corresponding to the offset */
CurrentOffset += (ULONG_PTR)ApiMessage;
/* Validate the bounds of the current pointed pointer */
if ((*(PULONG_PTR)RemoteCaptureBuffer->PointerOffsetsArray[i] >= CsrThread->Process->ClientViewBase) &&
(*(PULONG_PTR)RemoteCaptureBuffer->PointerOffsetsArray[i] < CsrThread->Process->ClientViewBounds))
if ((*(PULONG_PTR)CurrentOffset >= CsrThread->Process->ClientViewBase) &&
(*(PULONG_PTR)CurrentOffset < CsrThread->Process->ClientViewBounds))
{
/* Modify the pointed pointer to take into account its new position */
*(PULONG_PTR)RemoteCaptureBuffer->PointerOffsetsArray[i] += BufferDistance;
*(PULONG_PTR)CurrentOffset += BufferDistance;
}
else
{
@ -1203,10 +1209,9 @@ CsrCaptureArguments(IN PCSR_THREAD CsrThread,
DbgBreakPoint();
ApiMessage->Status = STATUS_INVALID_PARAMETER;
}
/* Transform back into an offset */
RemoteCaptureBuffer->PointerOffsetsArray[i] -= (ULONG_PTR)ApiMessage;
}
++OffsetPointer;
}
/* Check if we got success */
@ -1249,7 +1254,9 @@ CsrReleaseCapturedArguments(IN PCSR_API_MESSAGE ApiMessage)
{
PCSR_CAPTURE_BUFFER RemoteCaptureBuffer, LocalCaptureBuffer;
SIZE_T BufferDistance;
ULONG i;
ULONG PointerCount;
PULONG_PTR OffsetPointer;
ULONG_PTR CurrentOffset;
/* Get the remote capture buffer */
RemoteCaptureBuffer = ApiMessage->CsrCaptureData;
@ -1272,19 +1279,22 @@ CsrReleaseCapturedArguments(IN PCSR_API_MESSAGE ApiMessage)
* to the local data buffer instead of the remote one (revert
* the logic of CsrCaptureArguments).
*/
for (i = 0 ; i < RemoteCaptureBuffer->PointerCount ; ++i)
PointerCount = RemoteCaptureBuffer->PointerCount;
OffsetPointer = RemoteCaptureBuffer->PointerOffsetsArray;
while (PointerCount--)
{
if (RemoteCaptureBuffer->PointerOffsetsArray[i] != 0)
CurrentOffset = *OffsetPointer;
if (CurrentOffset != 0)
{
/* Temporarily transform the offset into a pointer */
RemoteCaptureBuffer->PointerOffsetsArray[i] += (ULONG_PTR)ApiMessage;
/* Get the pointer corresponding to the offset */
CurrentOffset += (ULONG_PTR)ApiMessage;
/* Modify the pointed pointer to take into account its new position */
*(PULONG_PTR)RemoteCaptureBuffer->PointerOffsetsArray[i] -= BufferDistance;
/* Transform back into an offset */
RemoteCaptureBuffer->PointerOffsetsArray[i] -= (ULONG_PTR)ApiMessage;
*(PULONG_PTR)CurrentOffset -= BufferDistance;
}
++OffsetPointer;
}
/* Copy the data back */
@ -1328,7 +1338,8 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
{
PCSR_CAPTURE_BUFFER CaptureBuffer = ApiMessage->CsrCaptureData;
SIZE_T BufferDistance = (ULONG_PTR)Buffer - (ULONG_PTR)ApiMessage;
ULONG i;
ULONG PointerCount;
PULONG_PTR OffsetPointer;
/*
* Check whether we have a valid buffer pointer, elements
@ -1364,16 +1375,20 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
if ((CaptureBuffer->Size - (ULONG_PTR)*Buffer + (ULONG_PTR)CaptureBuffer) >=
(ElementCount * ElementSize))
{
for (i = 0 ; i < CaptureBuffer->PointerCount ; ++i)
/* Perform the validation test */
PointerCount = CaptureBuffer->PointerCount;
OffsetPointer = CaptureBuffer->PointerOffsetsArray;
while (PointerCount--)
{
/*
* The pointer offset must be equal to the delta between
* the addresses of the buffer and of the API message.
*/
if (CaptureBuffer->PointerOffsetsArray[i] == BufferDistance)
if (*OffsetPointer == BufferDistance)
{
return TRUE;
}
++OffsetPointer;
}
}
}