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#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <imagehlp.h>
#include <cvinfo.h>
#include <cvexefmt.h>
BOOL
StripCv(
PSZ szImage
);
void __cdecl main(int argc, char *argv[]);
void Usage(void);
void
Usage (void)
{
puts("USAGE: StripCV <imagename>\n"
"\tRemove non-public CV info from an image.\n");
}
void __cdecl
main(
int argc,
char *argv[])
{
int i;
if (argc < 2) {
Usage();
exit(1);
}
for (i = 1; i < argc; i++) {
StripCv(argv[i]);
}
}
BOOL
StripCv(
PSZ szImage
)
{
PCHAR CvDebugData;
unsigned int i, NumberOfDebugDirectories;
ULONG DebugDirectorySize, NewCvSize = 0;
PCHAR NewCvData;
HANDLE FileHandle, hMappedFile;
PVOID DebugDirectories, ImageBase;
PIMAGE_NT_HEADERS NtHeaders;
PIMAGE_DEBUG_DIRECTORY DebugDirectory;
BOOL fRemoveCV = FALSE;
BOOL fDbgFile = FALSE;
ULONG *pDebugSize, FileSize;
BOOL RC = TRUE;
FileHandle = CreateFile(
szImage,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL );
if (FileHandle == INVALID_HANDLE_VALUE) {
printf("Error: Unable to open %s - rc: %d\n", szImage, GetLastError());
RC = FALSE;
goto cleanup1;
}
FileSize = GetFileSize(FileHandle, NULL);
hMappedFile = CreateFileMapping( FileHandle, NULL, PAGE_READWRITE, 0, 0, NULL );
if (!hMappedFile) {
printf("Error: Unable to create read/write map on %s - rc: %d\n", szImage, GetLastError());
RC = FALSE;
goto cleanup2;
}
ImageBase = MapViewOfFile( hMappedFile, FILE_MAP_WRITE, 0, 0, 0 );
if (!ImageBase) {
printf("Error: Unable to Map view of file %s - rc: %d\n", szImage, GetLastError);
RC = FALSE;
goto cleanup3;
}
if (*(USHORT *)ImageBase == IMAGE_SEPARATE_DEBUG_SIGNATURE) {
fDbgFile = TRUE;
PIMAGE_SEPARATE_DEBUG_HEADER DbgFile = (PIMAGE_SEPARATE_DEBUG_HEADER) ImageBase;
DebugDirectories = (PIMAGE_DEBUG_DIRECTORY)((PUCHAR)ImageBase +
sizeof(IMAGE_SEPARATE_DEBUG_HEADER) +
(DbgFile->NumberOfSections * sizeof(IMAGE_SECTION_HEADER)) +
DbgFile->ExportedNamesSize );
pDebugSize = &(DbgFile->DebugDirectorySize);
DebugDirectorySize = DbgFile->DebugDirectorySize;
} else {
NtHeaders = ImageNtHeader( ImageBase );
if (NtHeaders == NULL) {
printf("Error: %s is not an NT image\n", szImage);
RC = FALSE;
goto cleanup4;
}
DebugDirectories =
ImageDirectoryEntryToData(
ImageBase,
FALSE,
IMAGE_DIRECTORY_ENTRY_DEBUG,
&DebugDirectorySize );
pDebugSize = &(NtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].Size);
}
if (DebugDirectories == NULL || DebugDirectorySize == 0)
{
printf("Warning: No debug info found on %s\n", szImage);
RC = FALSE;
goto cleanup4;
}
DebugDirectory = (PIMAGE_DEBUG_DIRECTORY) DebugDirectories;
NumberOfDebugDirectories = DebugDirectorySize / sizeof( IMAGE_DEBUG_DIRECTORY );
CvDebugData = NULL;
for (i=0; i < NumberOfDebugDirectories; i++) {
if (DebugDirectory->Type == IMAGE_DEBUG_TYPE_CODEVIEW) {
CvDebugData = (PCHAR)ImageBase + DebugDirectory->PointerToRawData;
break;
}
// Zero out the Fixup data
if (DebugDirectory->Type == IMAGE_DEBUG_TYPE_FIXUP) {
printf("Info: Removing Fixup data from %s\n", szImage);
RtlZeroMemory(((PUCHAR)ImageBase + DebugDirectory->PointerToRawData),
DebugDirectory->SizeOfData);
DebugDirectory = DebugDirectory+1;
*pDebugSize -= sizeof(IMAGE_DEBUG_DIRECTORY);
} else {
DebugDirectory++;
}
}
if (CvDebugData == NULL) {
printf("Info: No CV Debug found on %s\n", szImage);
RC = FALSE;
goto cleanup5;
}
if (RemovePrivateCvSymbolic(CvDebugData, &NewCvData, &NewCvSize)) {
printf("Info: CV types info stripped from %s\n", szImage);
}
RtlCopyMemory(CvDebugData, NewCvData, NewCvSize);
DebugDirectory = (PIMAGE_DEBUG_DIRECTORY) DebugDirectories;
for (i=0; i < NumberOfDebugDirectories; i++) {
if (DebugDirectory->Type == IMAGE_DEBUG_TYPE_CODEVIEW) {
if (i+1 == NumberOfDebugDirectories) {
// This is the simple case. cv is the last entry. Simply truncate the image.
FileSize += NewCvSize - DebugDirectory->SizeOfData;
}
DebugDirectory->SizeOfData = NewCvSize;
break;
}
DebugDirectory++;
}
cleanup5:
// All done.
if (!fDbgFile) {
PIMAGE_NT_HEADERS pHdr = NULL;
DWORD SumHeader;
DWORD SumTotal;
pHdr = CheckSumMappedFile(ImageBase, FileSize, &SumHeader, &SumTotal);
if (pHdr != NULL) {
pHdr->OptionalHeader.CheckSum = SumTotal;
}
}
FlushViewOfFile(ImageBase, NULL);
cleanup4:
UnmapViewOfFile(ImageBase);
cleanup3:
CloseHandle(hMappedFile);
cleanup2:
SetFilePointer(FileHandle, FileSize, NULL, FILE_BEGIN);
SetEndOfFile(FileHandle);
CloseHandle(FileHandle);
cleanup1:
return(RC);
}
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