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// Copyright (C) Microsoft Corporation. All rights reserved.
#include "precomp.h"
#ifndef _KERNEL_MODE
#include <intrin.h> // for _ReturnAddress for user mode
#endif // UM
typedef struct _PLACEMENT_NEW_ALLOCATION_CONTEXT
{
size_t cbMaxSize;
_Field_size_bytes_(cbMaxSize) void* pbBuffer;
} PLACEMENT_NEW_ALLOCATION_CONTEXT, * PPLACEMENT_NEW_ALLOCATION_CONTEXT;
typedef const PLACEMENT_NEW_ALLOCATION_CONTEXT* PCPLACEMENT_NEW_ALLOCATION_CONTEXT;
// for FreeWdfMemoryBuffer to correct get
// the handle to free the memory
struct WIFI_IHV_MEMORY_HEADER
{
size_t HeaderSize;
WDFMEMORY WdfMemoryHandle;
};
// for tracking memory leaks
struct WIFI_IHV_MEMORY_CONTEXT
{
size_t ContextSize;
void* pvCaller;
};
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(WIFI_IHV_MEMORY_CONTEXT, GetWificxIhvMemoryContextFromHandle);
void* AllocateWdfMemoryBuffer(size_t Size, _In_ void* CallerForMemoryLeakTracking)
{
size_t totalSize = 0;
if (!NT_SUCCESS(Wifi::SizeTAddSafe(Size, sizeof(WIFI_IHV_MEMORY_HEADER), &totalSize)))
{
NT_ASSERT(FALSE);
WFCError("Failed to calculate total size");
return nullptr;
}
// allocate the context memory to store the WIFI_IHV_MEMORY_CONTEXT
WDF_OBJECT_ATTRIBUTES attributes;
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&attributes, WIFI_IHV_MEMORY_CONTEXT);
WDFMEMORY wdfMemoryBufferHandle = WDF_NO_HANDLE;
void* pWdfMemoryBuffer = nullptr;
if (!NT_SUCCESS(WdfMemoryCreate(&attributes, NonPagedPoolNx, WIFI_DRIVER_DEFAULT_POOL_TAG, totalSize, &wdfMemoryBufferHandle, &pWdfMemoryBuffer)))
{
WFCError("Failed to allocate memory buffer");
return nullptr;
}
RtlZeroMemory(pWdfMemoryBuffer, totalSize);
// store the wdf memory handle in the header for FreeWdfMemoryBuffer to find the handle
WIFI_IHV_MEMORY_HEADER* pMemoryHeader = static_cast<WIFI_IHV_MEMORY_HEADER*>(pWdfMemoryBuffer);
pMemoryHeader->HeaderSize = sizeof(WIFI_IHV_MEMORY_HEADER);
pMemoryHeader->WdfMemoryHandle = wdfMemoryBufferHandle;
// store the caller and caller's caller for tracking memory leaks
auto memoryContext = GetWificxIhvMemoryContextFromHandle(wdfMemoryBufferHandle);
RtlZeroMemory(memoryContext, sizeof(WIFI_IHV_MEMORY_CONTEXT));
memoryContext->ContextSize = sizeof(WIFI_IHV_MEMORY_CONTEXT);
memoryContext->pvCaller = CallerForMemoryLeakTracking;
// hide the wdf memory header to the caller.
const ULONG_PTR wdfMemoryWithHeaderBuffer = reinterpret_cast<ULONG_PTR>(pWdfMemoryBuffer);
ULONG_PTR wdfMemoryPayloadOnlyBuffer{ 0 };
if (!NT_SUCCESS(Wifi::ULongPtrAddSafe(wdfMemoryWithHeaderBuffer, sizeof(WIFI_IHV_MEMORY_HEADER), &wdfMemoryPayloadOnlyBuffer)))
{
NT_ASSERT(FALSE);
WFCError("Failed to calculate payload buffer address");
return nullptr;
}
return reinterpret_cast<void*>(wdfMemoryPayloadOnlyBuffer);
}
void FreeWdfMemoryBuffer(_In_opt_ void* pBuffer)
{
if (pBuffer == nullptr) // existing wdi code not checking for nullptr before delete, so we have to leave it as is
{
return;
}
const ULONG_PTR wdfMemoryPayloadOnlyBuffer = reinterpret_cast<ULONG_PTR>(pBuffer);
ULONG_PTR wdfMemoryWithHeaderBuffer{ 0 };
if (!NT_SUCCESS(Wifi::ULongPtrSubSafe(wdfMemoryPayloadOnlyBuffer, sizeof(WIFI_IHV_MEMORY_HEADER), &wdfMemoryWithHeaderBuffer)))
{
NT_ASSERT(FALSE);
WFCError("Failed to calculate header buffer address");
return;
}
const auto wificxMemoryHeader = static_cast<WIFI_IHV_MEMORY_HEADER*>(reinterpret_cast<void*>(wdfMemoryWithHeaderBuffer));
// This is memory corruption detection logic,
// keep it, don't remove it.
NT_ASSERT(wificxMemoryHeader->HeaderSize == sizeof(WIFI_IHV_MEMORY_HEADER));
WdfObjectDelete(wificxMemoryHeader->WdfMemoryHandle);
}
_Ret_writes_bytes_maybenull_(_Size) void* PlacementNewHelper(size_t _Size, PCPLACEMENT_NEW_ALLOCATION_CONTEXT AllocationContext)
{
if (_Size <= AllocationContext->cbMaxSize)
{
RtlZeroMemory(AllocationContext->pbBuffer, _Size);
return AllocationContext->pbBuffer;
}
WFCError(
"Placement operator new called with insufficient buffer space (desired: %Iu, availible: %Iu)", _Size, AllocationContext->cbMaxSize);
return nullptr;
}
void* __cdecl operator new(size_t Size) noexcept
{
return AllocateWdfMemoryBuffer(Size, _ReturnAddress());
}
__forceinline void* __cdecl operator new(size_t _Size, ULONG_PTR AllocationContext) noexcept // for WIFICX TLV
{
if (AllocationContext != 0)
{
return PlacementNewHelper(_Size, (PPLACEMENT_NEW_ALLOCATION_CONTEXT)AllocationContext);
}
return AllocateWdfMemoryBuffer(_Size, _ReturnAddress());
}
void __cdecl operator delete(void* pData) noexcept
{
FreeWdfMemoryBuffer(pData);
}
void __cdecl operator delete[](void* pData) noexcept
{
FreeWdfMemoryBuffer(pData);
}
void __cdecl operator delete(void* pData, ULONG_PTR) noexcept // For WIFICX TLV
{
FreeWdfMemoryBuffer(pData);
}
void __cdecl operator delete[](void* pData, ULONG_PTR) noexcept // For WIFICX TLV
{
FreeWdfMemoryBuffer(pData);
}
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