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fix pure long overflow

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CrazyRedMachine 2023-02-18 21:58:52 +01:00
parent 15b8274e98
commit fe6fd21802
1 changed files with 43 additions and 3 deletions
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46
popnhax/dllmain.cc
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@ -530,10 +530,48 @@ char *parse_patchdb(const char *input_filename, char *base_data) {
return target; return target;
} }
static bool patch_purelong()
{
DWORD dllSize = 0;
char *data = getDllData("popn22.dll", &dllSize);
{
fuzzy_search_task task;
FUZZY_START(task, 1)
FUZZY_CODE(task, 0, "\x80\x1A\x06\x00\x83\xFA\x08\x77\x08", 9)
int64_t pattern_offset = find_block(data, dllSize, &task, 0);
if (pattern_offset == -1) {
printf("popnhax: Couldn't find score increment function\n");
return false;
}
uint64_t patch_addr = (int64_t)data + pattern_offset + 24;
uint8_t *patch_str = (uint8_t *) patch_addr;
DWORD old_prot;
VirtualProtect((LPVOID)patch_str, 20, PAGE_EXECUTE_READWRITE, &old_prot);
for (int i=12; i>=0; i--)
{
patch_str[i+1] = patch_str[i];
}
patch_str[0] = 0x33;
patch_str[1] = 0xD2;
patch_str[3] = 0x34;
VirtualProtect((LPVOID)patch_str, 20, old_prot, &old_prot);
}
return true;
}
static bool patch_database(bool force_unlocks) { static bool patch_database(bool force_unlocks) {
DWORD dllSize = 0; DWORD dllSize = 0;
char *data = getDllData("popn22.dll", &dllSize); char *data = getDllData("popn22.dll", &dllSize);
/* replace idiv by div in score increment computation to avoid score overflow with pure long */
patch_purelong();
{ {
fuzzy_search_task task; fuzzy_search_task task;
@ -1577,7 +1615,7 @@ static bool patch_quick_retire()
MH_CreateHook((LPVOID)patch_addr, (LPVOID)quickexit_result_loop, MH_CreateHook((LPVOID)patch_addr, (LPVOID)quickexit_result_loop,
(void **)&real_result_loop); (void **)&real_result_loop);
} }
printf("popnhax: quick retire enabled\n"); printf("popnhax: quick retire enabled\n");
return true; return true;
} }
@ -1702,8 +1740,10 @@ BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserv
force_unlock_deco_parts(); force_unlock_deco_parts();
} }
//patch_get_time(); #if DEBUG == 1
patch_get_time();
#endif
MH_EnableHook(MH_ALL_HOOKS); MH_EnableHook(MH_ALL_HOOKS);
break; break;