114 lines
2.1 KiB
C++
114 lines
2.1 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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HeapPadAllocation.cpp
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ModAbstract:
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This shim pads heap allocations by n bytes - where n is 256 by default but
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can be specified by command line.
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Notes:
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This is a general purpose shim.
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History:
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09/28/1999 linstev Created
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04/25/2000 linstev Added command line
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(HeapPadAllocation)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(RtlAllocateHeap)
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APIHOOK_ENUM_END
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#define DEFAULT_PAD_SIZE 256
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DWORD g_dwPadSize = DEFAULT_PAD_SIZE;
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/*++
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Increase the heap allocation size.
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--*/
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PVOID
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APIHOOK(RtlAllocateHeap)(
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PVOID HeapHandle,
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ULONG Flags,
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SIZE_T Size
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)
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{
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return ORIGINAL_API(RtlAllocateHeap)(HeapHandle, Flags, Size + g_dwPadSize);
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}
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/*++
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Handle DLL_PROCESS_ATTACH and DLL_PROCESS_DETACH in your notify function
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to do initialization and uninitialization.
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IMPORTANT: Make sure you ONLY call NTDLL and KERNEL32 APIs during
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DLL_PROCESS_ATTACH notification. No other DLLs are initialized at that
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point.
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If your shim cannot initialize properly, return FALSE and none of the
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APIs specified will be hooked.
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--*/
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason)
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{
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if (fdwReason == DLL_PROCESS_ATTACH)
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{
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CSTRING_TRY
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{
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CString csCl(COMMAND_LINE);
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if (! csCl.IsEmpty())
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{
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WCHAR * unused = NULL;
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g_dwPadSize = wcstol(csCl, &unused, 10);
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}
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if (g_dwPadSize == 0)
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{
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g_dwPadSize = DEFAULT_PAD_SIZE;
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}
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DPFN( eDbgLevelInfo, "Padding all heap allocations by %d bytes\n", g_dwPadSize);
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}
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CSTRING_CATCH
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{
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return FALSE;
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}
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}
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return TRUE;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(NTDLL.DLL, RtlAllocateHeap)
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CALL_NOTIFY_FUNCTION
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HOOK_END
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IMPLEMENT_SHIM_END
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