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[CSRSRV] Clarify few comments, and use MAXULONG.

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Hermès Bélusca-Maïto 2020-10-30 01:08:23 +01:00
parent 9b421af118
commit f4279fc356
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1 changed files with 7 additions and 10 deletions
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17
subsystems/win32/csrsrv/api.c
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@ -1240,7 +1240,7 @@ CsrCaptureArguments(IN PCSR_THREAD CsrThread,
BufferDistance = (ULONG_PTR)ServerCaptureBuffer - (ULONG_PTR)ClientCaptureBuffer;
/*
* All the pointer offsets correspond to pointers which point
* All the pointer offsets correspond to pointers that point
* to the server data buffer instead of the client one.
*/
// PointerCount = ServerCaptureBuffer->PointerCount;
@ -1355,7 +1355,7 @@ CsrReleaseCapturedArguments(IN PCSR_API_MESSAGE ApiMessage)
BufferDistance = (ULONG_PTR)ServerCaptureBuffer - (ULONG_PTR)ClientCaptureBuffer;
/*
* All the pointer offsets correspond to pointers which point
* All the pointer offsets correspond to pointers that point
* to the client data buffer instead of the server one (reverse
* the logic of CsrCaptureArguments()).
*/
@ -1438,7 +1438,7 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
* of non-trivial size and that we don't overflow.
*/
if (!Buffer || ElementSize == 0 ||
(ULONGLONG)ElementCount * ElementSize > (ULONGLONG)0xFFFFFFFF)
(ULONGLONG)ElementCount * ElementSize > (ULONGLONG)MAXULONG)
{
return FALSE;
}
@ -1451,10 +1451,7 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
/* Check if we have no capture buffer */
if (!CaptureBuffer)
{
/*
* In this case, check only the Process ID
* and if there is a match, we succeed.
*/
/* In this case, succeed only if the caller is CSRSS */
if (NtCurrentTeb()->ClientId.UniqueProcess ==
ApiMessage->Header.ClientId.UniqueProcess)
{
@ -1463,7 +1460,7 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
}
else
{
/* Make sure that there is still space left in the buffer */
/* Make sure that there is still space left in the capture buffer */
if ((CaptureBuffer->Size - (ULONG_PTR)*Buffer + (ULONG_PTR)CaptureBuffer) >=
(ElementCount * ElementSize))
{
@ -1473,8 +1470,8 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
while (PointerCount--)
{
/*
* The pointer offset must be equal to the delta between
* the addresses of the buffer and of the API message.
* Find in the array, the pointer offset (from the
* API message) that corresponds to the buffer.
*/
if (*OffsetPointer == BufferDistance)
{