You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.9 KiB
109 lines
2.9 KiB
/*++
|
|
|
|
Copyright (c) 2000-2002 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
Shrinker.cpp
|
|
|
|
Abstract:
|
|
|
|
Fix Shrinker library problem. This library is hacking some ntdll and kernel32 opcode
|
|
with unreliable way to do it.
|
|
|
|
First, they try to search the matching opcode within 32 bytes from the hacked
|
|
function (the function address retrieved from GetProcAddress and the opcode bytes
|
|
retrieved via ReadProcessMemory).
|
|
If they found it, then they replaced it with their opcode to redirect the call
|
|
into their own routine.
|
|
|
|
Unfortunately, opcode in Whistler has changed. So, the result will be unpredictable.
|
|
They could be ended up with unexpected behavior from misreplacement of opcode
|
|
or the app decided to terminated itself since the matching opcode can't be found.
|
|
|
|
We fixed this by providing an exact matching opcode.
|
|
|
|
Addition: Shrinker also checks against ExitProcess for exact opcodes, these
|
|
values have recently changed and no longer match against their hard coded
|
|
values. We now provide matching opcodes for ExitProcess also.
|
|
|
|
Notes:
|
|
|
|
Hooking ntdll!LdrAccessResource to emulate Win2K's version of it.
|
|
Hooking Kernel32!ExitProcess to emulate Win2K's version of it.
|
|
|
|
History:
|
|
|
|
11/17/2000 andyseti Created
|
|
04/30/2001 mnikkel Added ExitProcess
|
|
05/01/2001 mnikkel Corrected calls to ldraccessresource and exitprocess
|
|
02/20/2002 mnikkel Corrected exitprocess parameter to remove w4 warning
|
|
|
|
--*/
|
|
|
|
#include "precomp.h"
|
|
#include <nt.h>
|
|
|
|
|
|
IMPLEMENT_SHIM_BEGIN(Shrinker)
|
|
#include "ShimHookMacro.h"
|
|
|
|
APIHOOK_ENUM_BEGIN
|
|
APIHOOK_ENUM_ENTRY(LdrAccessResource)
|
|
APIHOOK_ENUM_ENTRY(ExitProcess)
|
|
APIHOOK_ENUM_END
|
|
|
|
__declspec(naked)
|
|
NTSTATUS
|
|
APIHOOK(LdrAccessResource)(
|
|
IN PVOID /*DllHandle*/,
|
|
IN const IMAGE_RESOURCE_DATA_ENTRY* /*ResourceDataEntry*/,
|
|
OUT PVOID * /*Address*/ OPTIONAL,
|
|
OUT PULONG /*Size*/ OPTIONAL)
|
|
{
|
|
_asm {
|
|
push [esp+0x10] // shrinker lib needs these opcode signature (found in Win2K), -
|
|
push [esp+0x10] // but the actual LdrAccessResource doesn't have them
|
|
push [esp+0x10]
|
|
push [esp+0x10]
|
|
|
|
call dword ptr [LdrAccessResource]
|
|
|
|
ret 0x10 // when exit, pop 16 bytes from stack.
|
|
}
|
|
}
|
|
|
|
__declspec(naked)
|
|
VOID
|
|
APIHOOK(ExitProcess)(
|
|
UINT /*uExitCode*/
|
|
)
|
|
{
|
|
_asm {
|
|
push ebp // shrinker is looking for these exact op codes in
|
|
mov ebp,esp // ExitProcess, but the routine has changed.
|
|
push 0xFFFFFFFF
|
|
push 0x77e8f3b0
|
|
|
|
push [ebp+4]
|
|
call dword ptr [ExitProcess]
|
|
|
|
pop ebp
|
|
ret 4
|
|
}
|
|
}
|
|
|
|
|
|
/*++
|
|
|
|
Register hooked functions
|
|
|
|
--*/
|
|
|
|
HOOK_BEGIN
|
|
APIHOOK_ENTRY(NTDLL.DLL, LdrAccessResource)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, ExitProcess)
|
|
HOOK_END
|
|
|
|
|
|
IMPLEMENT_SHIM_END
|