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stubs.c
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// KLoader project Version 2.9.2
//
// module: stubs.c
// $Revision: 45 $
// $Date: 2012-05-09 13:18:54 +0400 (Ср, 09 май 2012) $
// description:
// Kernel-mode loader for user images. Loader APC stubs.
#include <ntddk.h>
#include <ntimage.h>
#include "version.h"
#include "ntddkex.h"
#include "pesup.h"
#include "kloader.h"
//
// APC function. Initializes mapped image of a DLL: processes import, restores section protection. Executes image entry.
//
VOID _stdcall LoadDllApcStub(
PLOADER_CONTEXT LdrCtx,
PVOID SystemArgument1,
PVOID SystemArgument2
)
{
HANDLE hModule;
PCHAR ImageBase;
BOOL Result;
if (ImageBase = (PCHAR)LdrCtx->ImageBase)
{
NTSTATUS ntStatus = STATUS_SUCCESS;
FUNC_DLL_MAIN pDllMain;
FUNC_APP_ENTRY AppEntryPoint;
// Initializing DLL image
PIMAGE_NT_HEADERS Pe = (PIMAGE_NT_HEADERS)(ImageBase + ((PIMAGE_DOS_HEADER)ImageBase)->e_lfanew);
PIMAGE_SECTION_HEADER Section = IMAGE_FIRST_SECTION(Pe);
ULONG i, OldProtect, NumberSections = Pe->FileHeader.NumberOfSections;
// Resolving module import
ULONG ImportStartRVA;
PCHAR ModuleName;
PVOID ImportedModuleBase = NULL;
PIAT_ENTRY pIatEntry = NULL;
PIMAGE_IMPORT_DESCRIPTOR pImportDesc;
// Get the import table RVA from the data dir
if (ImportStartRVA = Pe->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
{
pImportDesc = (PIMAGE_IMPORT_DESCRIPTOR)(ImageBase + ImportStartRVA);
// Find the import descriptor containing references to callee's functions
for (; pImportDesc->Name; pImportDesc++)
{
ULONG NameLen = 0;
ModuleName = ImageBase + pImportDesc->Name;
while(ModuleName[NameLen])
{
LdrCtx->wDllPath[NameLen] = (WCHAR)ModuleName[NameLen];
NameLen += 1;
}
LdrCtx->uDllPath.Length = (USHORT)(NameLen*sizeof(WCHAR));
LdrCtx->uDllPath.MaximumLength = (USHORT)((NameLen+1)*sizeof(WCHAR));
LdrCtx->uDllPath.Buffer = (PWSTR)&LdrCtx->wDllPath;
ntStatus = ((FUNC_LOAD_LIBRARY)LdrCtx->Import.pLdrLoadDll)(NULL, 0, &LdrCtx->uDllPath, &ImportedModuleBase);
if (NT_SUCCESS(ntStatus))
{
ULONG rvaINT = pImportDesc->OriginalFirstThunk;
ULONG rvaIAT = pImportDesc->FirstThunk;
PIAT_ENTRY pIatEntry = NULL;
PIMAGE_IMPORT_BY_NAME pOrdinalName;
PIMAGE_THUNK_DATA pINT;
PIMAGE_THUNK_DATA pIAT;
IAT_ENTRY IatEntry;
USHORT Ordinal = 0;
if ( rvaINT == 0 ) // No Characteristics field?
rvaINT = rvaIAT;
if ( rvaINT != 0 ) // No FirstThunk field? Ooops!!!
{
// Adjust the pointer to point where the tables are in the mem mapped file.
pINT = (PIMAGE_THUNK_DATA)(ImageBase + rvaINT);
pIAT = (PIMAGE_THUNK_DATA)(ImageBase + rvaIAT);
while (TRUE) // Loop forever (or until we break out)
{
if (pINT->u1.AddressOfData == 0)
break;
if (IMAGE_SNAP_BY_ORDINAL(pINT->u1.Ordinal) == FALSE)
pOrdinalName = (PIMAGE_IMPORT_BY_NAME)(ImageBase + (ULONG)pINT->u1.AddressOfData);
else if (pINT->u1.Ordinal >= (ULONG_PTR)ImageBase && pINT->u1.Ordinal < ((ULONG_PTR)ImageBase + Pe->OptionalHeader.SizeOfImage))
pOrdinalName = (PIMAGE_IMPORT_BY_NAME)((ULONG_PTR)pINT->u1.AddressOfData);
else
{
pOrdinalName = NULL;
Ordinal = (USHORT)IMAGE_ORDINAL(pINT->u1.Ordinal);
}
if (pOrdinalName)
{
NameLen = 0;
while(pOrdinalName->Name[NameLen])
NameLen += 1;
LdrCtx->uDllPath.Length = (USHORT)NameLen;
LdrCtx->uDllPath.MaximumLength = (USHORT)(NameLen + 1);
LdrCtx->uDllPath.Buffer = (PWSTR)&pOrdinalName->Name;
pOrdinalName = (PIMAGE_IMPORT_BY_NAME)&LdrCtx->uDllPath;
}
ntStatus = ((FUNC_PROC_ADDRESS)LdrCtx->Import.pLdrGetProcedureAddress)(ImportedModuleBase, (PANSI_STRING)pOrdinalName, Ordinal, (PVOID*)&IatEntry);
if (NT_SUCCESS(ntStatus))
{
pIatEntry = &pIAT->u1.Function;
*pIatEntry = IatEntry;
}
else
{
ntStatus = STATUS_PROCEDURE_NOT_FOUND;
break;
}
pINT++; // advance to next thunk
pIAT++; // advance to next thunk
} // while (TRUE)
} // if ( rvaINT != 0 )
} // if (NT_SUCCESS(ntStatus))
else
{
ntStatus = STATUS_INVALID_IMPORT_OF_NON_DLL;
break;
}
} // for (; pImportDesc->Name; pImportDesc++)
} // if (ImportStartRVA = Pe->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
if (NT_SUCCESS(ntStatus))
{
ULONG_PTR tSize = (ULONG_PTR)Pe->OptionalHeader.SizeOfHeaders;
// Restoring sections' protection
ntStatus = ((FUNC_PROTECT_MEM)LdrCtx->Import.pNtProtectVirtualMemory)((HANDLE)-1, (PVOID*)&ImageBase, &tSize, PAGE_READWRITE, &OldProtect);
for (i=0; (i<NumberSections && NT_SUCCESS(ntStatus)); i++)
{
ULONG NewProtect = 0;
PVOID BaseAddress;
if (Section->Characteristics & IMAGE_SCN_MEM_EXECUTE)
{
if (Section->Characteristics & IMAGE_SCN_MEM_WRITE)
NewProtect = PAGE_EXECUTE_READWRITE;
else
NewProtect = PAGE_EXECUTE_READ;
}
else if (Section->Characteristics & IMAGE_SCN_MEM_READ)
{
if (Section->Characteristics & IMAGE_SCN_MEM_WRITE)
NewProtect = PAGE_READWRITE;
else
NewProtect = PAGE_READONLY;
}
else
NewProtect = PAGE_READWRITE;
tSize = (ULONG_PTR)Section->Misc.VirtualSize;
BaseAddress = (PVOID)(ImageBase + Section->VirtualAddress);
ntStatus = ((FUNC_PROTECT_MEM)LdrCtx->Import.pNtProtectVirtualMemory)(NtCurrentProcess(), &BaseAddress, &tSize, NewProtect, &OldProtect);
Section += 1;
} // for (i=0; i<NumberSections; i++)
if (NT_SUCCESS(ntStatus))
{
// Calling DLL entry point
pDllMain = (FUNC_DLL_MAIN)(ImageBase + Pe->OptionalHeader.AddressOfEntryPoint);
Result = (pDllMain)(ImageBase, DLL_PROCESS_ATTACH, NULL);
} // if (NT_SUCCESS(ntStatus))
} // if (NT_SUCCESS(ntStatus))
} // if (ImageBase = LdrCtx->ImageBase)
else
{
// Loading DLL by name
if (NT_SUCCESS(((FUNC_LOAD_LIBRARY)LdrCtx->Import.pLdrLoadDll)(NULL, 0, &LdrCtx->uDllPath, &hModule)))
Result = TRUE;
}
UNREFERENCED_PARAMETER(SystemArgument1);
UNREFERENCED_PARAMETER(SystemArgument2);
}
#ifdef _M_AMD64
// This is normal LoadDllApcStub() function compiled for x86.
UCHAR LoadDllApcStubWow64[] = {
0x8B, 0xFF, 0x55, 0x8B, 0xEC, 0x83, 0xEC, 0x28, 0x53, 0x56, 0x57, 0x8B, 0x7D, 0x08, 0x8B, 0x8F,
0x30, 0x0A, 0x00, 0x00, 0x33, 0xDB, 0x89, 0x4D, 0x08, 0x3B, 0xCB, 0x0F, 0x84, 0x09, 0x02, 0x00,
0x00, 0x8B, 0x71, 0x3C, 0x03, 0xF1, 0x0F, 0xB7, 0x46, 0x14, 0x8D, 0x44, 0x30, 0x18, 0x89, 0x45,
0xE0, 0x0F, 0xB7, 0x46, 0x06, 0x89, 0x45, 0xE8, 0x89, 0x5D, 0xEC, 0x8B, 0x86, 0x80, 0x00, 0x00,
0x00, 0x3B, 0xC3, 0x0F, 0x84, 0x34, 0x01, 0x00, 0x00, 0x03, 0xC1, 0x8B, 0x50, 0x0C, 0x89, 0x45,
0xFC, 0x3B, 0xD3, 0x0F, 0x84, 0x24, 0x01, 0x00, 0x00, 0x8D, 0x04, 0x0A, 0x8A, 0x08, 0x33, 0xDB,
0x84, 0xC9, 0x74, 0x17, 0x8D, 0x97, 0x58, 0x0A, 0x00, 0x00, 0x66, 0x0F, 0xBE, 0xC9, 0x66, 0x89,
0x0A, 0x43, 0x8A, 0x0C, 0x18, 0x42, 0x42, 0x84, 0xC9, 0x75, 0xEF, 0x8D, 0x04, 0x1B, 0x8D, 0x8F,
0x50, 0x0A, 0x00, 0x00, 0x66, 0x89, 0x01, 0x83, 0xC0, 0x02, 0x66, 0x89, 0x87, 0x52, 0x0A, 0x00,
0x00, 0x8D, 0x87, 0x58, 0x0A, 0x00, 0x00, 0x89, 0x87, 0x54, 0x0A, 0x00, 0x00, 0x8D, 0x45, 0xEC,
0x50, 0x51, 0x33, 0xDB, 0x53, 0x53, 0xFF, 0x17, 0x3B, 0xC3, 0x89, 0x45, 0xF8, 0x0F, 0x8C, 0xB9,
0x00, 0x00, 0x00, 0x8B, 0x45, 0xFC, 0x8B, 0x10, 0x8B, 0x40, 0x10, 0x89, 0x5D, 0xF0, 0x3B, 0xD3,
0x75, 0x0A, 0x8B, 0xD0, 0x3B, 0xC3, 0x0F, 0x84, 0x89, 0x00, 0x00, 0x00, 0x8B, 0x4D, 0x08, 0x03,
0xC1, 0x8D, 0x1C, 0x0A, 0x89, 0x45, 0xF4, 0xEB, 0x6D, 0x78, 0x04, 0x03, 0xD1, 0xEB, 0x15, 0x3B,
0xD1, 0x72, 0x09, 0x8B, 0x46, 0x50, 0x03, 0xC1, 0x3B, 0xD0, 0x72, 0x08, 0x0F, 0xB7, 0x03, 0x33,
0xD2, 0x89, 0x45, 0xF0, 0x85, 0xD2, 0x74, 0x27, 0x33, 0xC9, 0x8D, 0x42, 0x02, 0x38, 0x08, 0x74,
0x07, 0x41, 0x80, 0x3C, 0x08, 0x00, 0x75, 0xF9, 0x8D, 0x97, 0x50, 0x0A, 0x00, 0x00, 0x66, 0x89,
0x0A, 0x41, 0x66, 0x89, 0x8F, 0x52, 0x0A, 0x00, 0x00, 0x89, 0x87, 0x54, 0x0A, 0x00, 0x00, 0x8D,
0x45, 0xE4, 0x50, 0xFF, 0x75, 0xF0, 0x52, 0xFF, 0x75, 0xEC, 0xFF, 0x57, 0x08, 0x89, 0x45, 0xF8,
0x85, 0xC0, 0x7C, 0x1A, 0x8B, 0x4D, 0xF4, 0x8B, 0x45, 0xE4, 0x89, 0x01, 0x8B, 0x4D, 0x08, 0x83,
0xC3, 0x04, 0x83, 0x45, 0xF4, 0x04, 0x8B, 0x13, 0x85, 0xD2, 0x75, 0x8D, 0xEB, 0x0A, 0xC7, 0x45,
0xF8, 0x7A, 0x00, 0x00, 0xC0, 0x8B, 0x4D, 0x08, 0x83, 0x45, 0xFC, 0x14, 0x8B, 0x45, 0xFC, 0x8B,
0x50, 0x0C, 0x85, 0xD2, 0x0F, 0x85, 0xEF, 0xFE, 0xFF, 0xFF, 0xEB, 0x07, 0xC7, 0x45, 0xF8, 0x6F,
0x03, 0x00, 0xC0, 0x83, 0x7D, 0xF8, 0x00, 0x0F, 0x8C, 0xC9, 0x00, 0x00, 0x00, 0x8B, 0x46, 0x54,
0x89, 0x45, 0xF4, 0x8D, 0x45, 0xDC, 0x50, 0x6A, 0x04, 0x8D, 0x45, 0xF4, 0x50, 0x8D, 0x45, 0x08,
0x50, 0x6A, 0xFF, 0xFF, 0x57, 0x10, 0x83, 0x65, 0xF8, 0x00, 0x83, 0x7D, 0xE8, 0x00, 0x76, 0x71,
0x8B, 0x5D, 0xE0, 0x83, 0xC3, 0x24, 0x85, 0xC0, 0x0F, 0x8C, 0x98, 0x00, 0x00, 0x00, 0x8B, 0x03,
0xA9, 0x00, 0x00, 0x00, 0x20, 0x74, 0x11, 0x25, 0x00, 0x00, 0x00, 0x80, 0xF7, 0xD8, 0x1B, 0xC0,
0x83, 0xE0, 0x20, 0x83, 0xC0, 0x20, 0xEB, 0x1A, 0xA9, 0x00, 0x00, 0x00, 0x40, 0x74, 0x10, 0x25,
0x00, 0x00, 0x00, 0x80, 0xF7, 0xD8, 0x1B, 0xC0, 0x83, 0xE0, 0x02, 0x40, 0x40, 0xEB, 0x03, 0x6A,
0x04, 0x58, 0x8B, 0x4B, 0xE4, 0x89, 0x4D, 0xF4, 0x8B, 0x4B, 0xE8, 0x03, 0x4D, 0x08, 0x89, 0x4D,
0xE0, 0x8D, 0x4D, 0xDC, 0x51, 0x50, 0x8D, 0x45, 0xF4, 0x50, 0x8D, 0x45, 0xE0, 0x50, 0x6A, 0xFF,
0xFF, 0x57, 0x10, 0x83, 0xC3, 0x28, 0xFF, 0x45, 0xF8, 0x8B, 0x4D, 0xF8, 0x3B, 0x4D, 0xE8, 0x72,
0x95, 0x33, 0xDB, 0x3B, 0xC3, 0x7C, 0x2F, 0x8B, 0x76, 0x28, 0x03, 0x75, 0x08, 0x53, 0x6A, 0x01,
0xFF, 0x75, 0x08, 0xFF, 0xD6, 0x89, 0x45, 0xE8, 0xEB, 0x1E, 0x8D, 0x45, 0xD8, 0x50, 0x8D, 0x87,
0x50, 0x0A, 0x00, 0x00, 0x50, 0x53, 0x53, 0xFF, 0x17, 0x85, 0xC0, 0x7C, 0x09, 0xC7, 0x45, 0xE8,
0x01, 0x00, 0x00, 0x00, 0xEB, 0x02, 0x33, 0xDB, 0x39, 0x5D, 0xE8, 0x74, 0x20, 0x8B, 0x87, 0x48,
0x0A, 0x00, 0x00, 0x0B, 0x87, 0x4C, 0x0A, 0x00, 0x00, 0x74, 0x12, 0x8D, 0x45, 0xDC, 0x50, 0x53,
0x57, 0x8D, 0x87, 0x28, 0x08, 0x00, 0x00, 0x50, 0x53, 0x53, 0xFF, 0x57, 0x20, 0x5F, 0x5E, 0x5B,
0xC9, 0xC2, 0x0C, 0x00
};
#endif // _M_AMD64