c++ - Why am i getting wrong values when performing PE base relocation? -

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i trying perform pe base relocation , whole concept, data structures, method , why doing not problem that. days have been trying code work whatever keep getting undefined/wrong relocation types in variable called relocationtype(obviously) , have feeling might getting wrong offsets aswell allthought when checked debugger few bytes off, regardless cause crash.

i should inform of relocation types correct, , either image_rel_absolute or image_rel_based_highlow 1 expect, after few loops finds wrong values. not have clue happening, suspect pbaserelocation might few bytes of reason after while.

here relocation function:

int fixrelocs(dword imagebase, pimage_nt_headers ntheaders, image_base_relocation *reloc, unsigned int size) { pimage_base_relocation pbaserelocation; image_data_directory datadir; pword list; dword delta; dword count; dword *patchaddr; unsigned char* dest; unsigned char* base = (unsigned char*)imagebase; bool ndelta = false;  datadir = (image_data_directory)ntheaders->optionalheader.datadirectory[image_directory_entry_basereloc]; pbaserelocation = (pimage_base_relocation)(imagebase + datadir.size);  if (imagebase > ntheaders->optionalheader.imagebase) {     delta = imagebase - ntheaders->optionalheader.imagebase; } else if (imagebase < ntheaders->optionalheader.imagebase) {     delta = ntheaders->optionalheader.imagebase - imagebase;     ndelta = true; } else {     return dll_no_reloc_required; }  while (pbaserelocation->virtualaddress > 0) {        count = (pbaserelocation->sizeofblock - sizeof(image_base_relocation)) / sizeof(word);     list = (pword)(pbaserelocation + sizeof(image_base_relocation));     dest = base + pbaserelocation->virtualaddress;      (int = 0; < count; i++) {         int offset = *list & 0x0fff;         int relocationtype = (*list >> 12) & 0x000f;          switch (relocationtype) {             case image_rel_based_absolute:                 break;             case image_rel_based_highlow:                 patchaddr = (dword*)(dest + offset);                  if (!ndelta) {                     *patchaddr += (dword)delta;                 }                 else {                     *patchaddr = (dword)delta;                 }                 break;             case image_rel_based_low:                 patchaddr = (dword*)(dest + offset);                  if (!ndelta) {                     *patchaddr += (word)((delta >> 16) & 0x0000ffff);                 }                 else {                     *patchaddr -= (word)((delta >> 16) & 0x0000ffff);                 }                 break;             default:                 dbgprint("dll!fixrelocs+0x156   unknown relocation %d. address: 0x%02x\n", relocationtype, patchaddr);                 break;         }          list++;          pbaserelocation = (pimage_base_relocation)((dword)pbaserelocation + pbaserelocation->sizeofblock);     } }  return 0; }

any appreciated, allthought know knowledge of topic limited.

regards paze.


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