Patching a VMDK file

Patching a VMDK file

#include <sys/stat.h> 
#include <fcntl.h>
#include <sys/mman.h>
#include <stdio.h>

int main(int argc, char **argv) {
        int filehandle;
        char *mmapbuffer;
        filehandle = open("sarpedon-000002.vmdk", O_RDWR);
        mmapbuffer = mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, f, 0);
        /* cbf94b5f */
        *(mmapbuffer + 0x248) = 'c';
        *(mmapbuffer + 0x249) = 'b';
        *(mmapbuffer + 0x24a) = 'f';
        *(mmapbuffer + 0x24b) = '9';
        *(mmapbuffer + 0x24c) = '4';
        *(mmapbuffer + 0x24d) = 'b';
        *(mmapbuffer + 0x24e) = '5';
        *(mmapbuffer + 0x24f) = 'f';
        msync(mmapbuffer, 4096, MS_SYNC);
        munmap(mmapbuffer, 4096);
        close(filehandle);
}