144 lines
2.8 KiB
C++
144 lines
2.8 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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SysAdmiral.cpp
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Abstract:
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Application's service control routine does not properly restore the stack
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when returning.
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History:
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10/22/2001 robkenny Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(SysAdmiral)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(StartServiceCtrlDispatcherA)
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APIHOOK_ENUM_END
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typedef BOOL (* _pfn_StartServiceCtrlDispatcherA)(CONST LPSERVICE_TABLE_ENTRYA lpServiceTable);
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/*++
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0x12345678 is replaced with the original service control routine's address
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--*/
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__declspec(naked)
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void
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Stub()
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{
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__asm
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{
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// save the current stack pointer in ESI
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push esi
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mov esi, esp
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mov eax, 0x12345678
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// push the arguments to the routine
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push [esi+0xc]
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push [esi+0x8]
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// call the routine
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call eax
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// Restore the stack to its value before the routine.
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mov esp, esi
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pop esi
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ret 0x8
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}
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}
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#define Stub_OrigApi_Offset 0x4
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#define STUB_SIZE 0x20
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/*++
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Create an in-memory routine to save and restore the stack.
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This is used rather than a subroutine because we cannot pass any parameters
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to the routine and it needs to know the address of the original service
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routine. A subroutine would have to use a global pointer to the service
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routine, limiting this shim to handling only a *single* service routine.
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--*/
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LPSERVICE_MAIN_FUNCTIONA
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BuildStackSaver(LPSERVICE_MAIN_FUNCTIONA lpServiceProc)
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{
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// Create the stub
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LPBYTE pStub = (LPBYTE) VirtualAlloc(
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0,
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STUB_SIZE,
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MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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if (!pStub)
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{
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DPFN( eDbgLevelError, "Could not allocate memory for stub");
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return NULL;
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}
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// Copy the template code into the memory.
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MoveMemory(pStub, Stub, STUB_SIZE);
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// Replace the place holding function pointer
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DWORD_PTR * origApi = (DWORD_PTR *)(pStub + Stub_OrigApi_Offset);
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*origApi = (DWORD_PTR)lpServiceProc;
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return (LPSERVICE_MAIN_FUNCTIONA)pStub;
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}
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/*++
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Application's service routine does not properly restore the stack when returning.
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--*/
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BOOL
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APIHOOK(StartServiceCtrlDispatcherA)(
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CONST LPSERVICE_TABLE_ENTRYA lpServiceTable // service table
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)
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{
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SERVICE_TABLE_ENTRYA myServiceTable = *lpServiceTable;
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//
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// Create our in-memory stack restoring functiono
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//
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myServiceTable.lpServiceProc = BuildStackSaver(lpServiceTable->lpServiceProc);
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if (myServiceTable.lpServiceProc)
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{
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return ORIGINAL_API(StartServiceCtrlDispatcherA)(&myServiceTable);
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}
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else
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{
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return FALSE;
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}
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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(ADVAPI32.DLL, StartServiceCtrlDispatcherA)
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HOOK_END
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IMPLEMENT_SHIM_END
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