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updated for shared memory support. #328

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updated for shared memory support. #328

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55efbe3
updated for shared memory support.
hardik05 Jul 27, 2021
72ba648
Update gdiplus.cpp
hardik05 Jul 29, 2021
cb6b286
Update gdiplus.cpp
hardik05 Jul 29, 2021
5b929f1
Update gdiplus.cpp
hardik05 Jul 29, 2021
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136 changes: 113 additions & 23 deletions gdiplus.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,47 +23,137 @@
#include <stdio.h>
#include <windows.h>
#include <gdiplus.h>
#include<shlwapi.h>
#include <inttypes.h>

#pragma comment(lib, "gdiplus.lib")
#pragma comment(lib, "shlwapi.lib")
using namespace Gdiplus;

/* for shared memory fuzzing */
#define MAX_SAMPLE_SIZE 1000000
#define SHM_SIZE (4 + MAX_SAMPLE_SIZE)
unsigned char* shm_data;

bool use_shared_memory;

HANDLE map_file;

//clear shared memory
int clear_shmem(void) {
UnmapViewOfFile(shm_data);
CloseHandle(map_file);
return 0;
}

//setup shared memory
int setup_shmem(const char* name) {
map_file = OpenFileMapping(
FILE_MAP_ALL_ACCESS, // read/write access
FALSE, // do not inherit the name
name); // name of mapping object

if (map_file == NULL) {
printf("Error accessing shared memory\n");
return 0;
}

shm_data = (unsigned char*)MapViewOfFile(map_file, // handle to map object
FILE_MAP_ALL_ACCESS, // read/write permission
0,
0,
SHM_SIZE);

if (shm_data == NULL) {
printf("Error accessing shared memory\n");
return 0;
}
CloseHandle(map_file);
return 1;
}

/* end shared memory fuzzing */

#define FUZZ_TARGET_MODIFIERS __declspec(dllexport)

wchar_t* charToWChar(const char* text)
{
size_t size = strlen(text) + 1;
wchar_t* wa = new wchar_t[size];
mbstowcs(wa,text,size);
return wa;
size_t size = strlen(text) + 1;
wchar_t* wa = new wchar_t[size];
mbstowcs(wa, text, size);
return wa;
}

int FUZZ_TARGET_MODIFIERS FuzzMe(wchar_t* filename)
{
Image* image = NULL;
Image* thumbnail = NULL;
if (!use_shared_memory)
{
image = new Image(filename);
}
else
{
char* sample_bytes = NULL;
uint32_t sample_size = 0;
sample_size = *(uint32_t*)(shm_data);
if (sample_size > MAX_SAMPLE_SIZE) sample_size = MAX_SAMPLE_SIZE;
sample_bytes = (char*)malloc(sample_size);
memcpy(sample_bytes, shm_data + sizeof(uint32_t), sample_size);
//lets create stream from memory and then we will create image.
IStream* stream = SHCreateMemStream(reinterpret_cast<BYTE*>(sample_bytes), sample_size);
image = Gdiplus::Image::FromStream(stream);
}
if (image && (Ok == image->GetLastStatus())) {
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Indentation seems to be off here

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trying multiple options.. but for some reasons its just not working..

//printf("Image loaded\n");
thumbnail = image->GetThumbnailImage(100, 100, NULL, NULL);
if (thumbnail && (Ok == thumbnail->GetLastStatus())) {
//printf("Thumbnail created\n");
}
}

//printf("Done\n");

if (image) delete image;
if (thumbnail) delete thumbnail;
return 0;

}

int main(int argc, char** argv)
{
if(argc < 2) {
printf("Usage: %s <image file>\n", argv[0]);
wchar_t* filename;

printf("[+] %s() offset: 0x%x\n", __FUNCTION__, (char*)(*&FuzzMe) - (char*)GetModuleHandleW(NULL));
if (argc < 3) {
printf("Usage: %s <-f|-m> <image file|shared memory>\n", argv[0]);
return 0;
}

if (!strcmp(argv[1], "-m")) {
use_shared_memory = true;
}
else if (!strcmp(argv[1], "-f")) {
use_shared_memory = false;
}
else {
printf("Usage: %s <-f|-m> <file or shared memory name>\n", argv[0]);
return 0;
}

GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
filename = charToWChar(argv[2]);

Image *image = NULL;
//*thumbnail=NULL;

image = new Image(charToWChar(argv[1]));
if(image && (Ok == image->GetLastStatus())) {
//printf("Image loaded\n");
/*thumbnail = image->GetThumbnailImage(100, 100, NULL, NULL);
if(thumbnail && (Ok == thumbnail->GetLastStatus())) {
//printf("Thumbnail created\n");
}*/
if (use_shared_memory) {
if (!setup_shmem(argv[2])) {
printf("Error mapping shared memory\n");
}
}

//printf("Done\n");

if(image) delete image;
//if(thumbnail) delete thumbnail;

FuzzMe(filename);
clear_shmem();
GdiplusShutdown(gdiplusToken);

return 0;
}