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updated stub drm patterns (for v2) and added a workaround for older variants

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otavepto 2024-03-18 03:32:37 +02:00
parent 648c19fd99
commit 16a241599f
3 changed files with 57 additions and 10 deletions
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1
CHANGELOG.md
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@ -1,4 +1,5 @@
* **[detiam]** fix linking errors when build on archlinux
* for windows: updated stub drm patterns and added a workaround for older variants
* added missing example file `disable_lobby_creation.txt` in `steam_settings` folder + updated release `README`
---

2
helpers/pe_helpers.cpp
View File

@ -462,7 +462,7 @@ size_t pe_helpers::get_current_exe_mem_size()
for (size_t i = 0; i < sections.count; ++i) {
auto section = sections.ptr[i];
MEMORY_BASIC_INFORMATION mbi{};
if (!VirtualQuery((LPVOID)((uint8_t *)hmod + section.VirtualAddress), &mbi, sizeof(mbi))) {
if (!VirtualQuery((LPCVOID)((uint8_t *)hmod + section.VirtualAddress), &mbi, sizeof(mbi))) {
return 0;
}
size = mbi.RegionSize; // actual section size in mem

64
tools/steamclient_loader/win/extra_protection/stubdrm.cpp
View File

@ -13,15 +13,18 @@ typedef struct SnrUnit {
typedef struct SnrDetails {
std::string detection_patt{};
bool change_mem_access = false;
std::vector<SnrUnit_t> snr_units{};
} SnrDetails_t;
// x64
#if defined(_WIN64)
const std::vector<SnrDetails> snr_patts {
static const std::vector<SnrDetails> snr_patts {
{
// detection_patt
"FF 94 24 ?? ?? ?? ?? 88 44 24 ?? 0F BE 44 24 ?? 83 ?? 30 74 ?? E9",
// change memory pages access to r/w/e
false,
// snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
@ -40,6 +43,8 @@ typedef struct SnrDetails {
{
// detection_patt
"FF D? 44 0F B6 ?? 3C 30 0F 85",
// change memory pages access to r/w/e
false,
// snr_units
{
{
@ -55,10 +60,12 @@ typedef struct SnrDetails {
// x32
#if !defined(_WIN64)
const std::vector<SnrDetails> snr_patts {
static const std::vector<SnrDetails> snr_patts {
{
// detection_patt
"FF 95 ?? ?? ?? ?? 88 45 ?? 0F BE 4D ?? 83 ?? 30 74 ?? E9",
// change memory pages access to r/w/e
false,
// snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
@ -77,18 +84,26 @@ typedef struct SnrDetails {
{
// detection_patt
"FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB",
// change memory pages access to r/w/e
true,
// snr_units
{
{
"F6 C? 02 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
"?? ?? ?? 90 E9 00 03",
},
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 00 03 00 00",
},
},
},
{
// detection_patt
"FF D? 88 45 ?? 3C 30 0F 85 ?? ?? ?? ?? B8 4D 5A",
// change memory pages access to r/w/e
false,
// snr_units
{
{
@ -106,15 +121,45 @@ typedef struct SnrDetails {
#endif // _WIN64
const std::vector<SnrUnit_t> *current_snr_units = nullptr;
static size_t current_snr_details = static_cast<size_t>(-1);
static std::recursive_mutex mtx_win32_api{};
static uint8_t *proc_addr_base = (uint8_t *)GetModuleHandleW(NULL);
static uint8_t *exe_addr_base = (uint8_t *)GetModuleHandleW(NULL);
static uint8_t *bind_addr_base = nullptr;
static uint8_t *bind_addr_end = nullptr;
bool restore_win32_apis();
// stub v2 needs manual change for .text, section must have write access
static void change_mem_pages_access()
{
auto sections = pe_helpers::get_section_headers((HMODULE)exe_addr_base);
if (!sections.count) return;
for (size_t i = 0; i < sections.count; ++i) {
auto section = sections.ptr[i];
uint8_t *section_base_addr = exe_addr_base + section.VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{};
constexpr const static auto ANY_EXECUTE_RIGHT = PAGE_EXECUTE | PAGE_EXECUTE_READ | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY;
if (VirtualQuery((LPCVOID)section_base_addr, &mbi, sizeof(mbi)) && // function succeeded
(mbi.Protect & ANY_EXECUTE_RIGHT)) { // this page (not entire section) has execute rights
DWORD current_protection = 0;
auto res = VirtualProtect(section_base_addr, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &current_protection);
// if (!res) {
// MessageBoxA(
// nullptr,
// (std::string("Failed to change access of page '") + (char *)section.Name + "' ").c_str(),
// "Failed",
// MB_OK
// );
// }
}
}
}
static void patch_if_possible(void *ret_addr)
{
if (!ret_addr) return;
@ -123,7 +168,7 @@ static void patch_if_possible(void *ret_addr)
if (!page_details.BaseAddress || page_details.AllocationProtect != PAGE_READWRITE) return;
bool anything_found = false;
for (const auto &snr_unit : *current_snr_units) {
for (const auto &snr_unit : snr_patts[current_snr_details].snr_units) {
auto mem = pe_helpers::search_memory(
(uint8_t *)page_details.BaseAddress,
page_details.RegionSize,
@ -144,6 +189,7 @@ static void patch_if_possible(void *ret_addr)
if (anything_found) {
restore_win32_apis();
if (snr_patts[current_snr_details].change_mem_access) change_mem_pages_access();
}
// MessageBoxA(NULL, ("ret addr = " + std::to_string((size_t)ret_addr)).c_str(), "Patched", MB_OK);
@ -239,15 +285,15 @@ static bool restore_win32_apis()
bool stubdrm::patch()
{
auto bind_section = pe_helpers::get_section_header_with_name(((HMODULE)proc_addr_base), ".bind");
auto bind_section = pe_helpers::get_section_header_with_name(((HMODULE)exe_addr_base), ".bind");
if (!bind_section) return false; // we don't have .bind section
bind_addr_base = proc_addr_base + bind_section->VirtualAddress;
bind_addr_base = exe_addr_base + bind_section->VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{};
if (!VirtualQuery((LPVOID)bind_addr_base, &mbi, sizeof(mbi))) return false;
bind_addr_end = bind_addr_base + mbi.RegionSize;
auto addrOfEntry = proc_addr_base + pe_helpers::get_optional_header((HMODULE)proc_addr_base)->AddressOfEntryPoint;
auto addrOfEntry = exe_addr_base + pe_helpers::get_optional_header((HMODULE)exe_addr_base)->AddressOfEntryPoint;
if (addrOfEntry < bind_addr_base || addrOfEntry >= bind_addr_end) return false; // entry addr is not inside .bind
for (const auto &patt : snr_patts) {
@ -257,7 +303,7 @@ bool stubdrm::patch()
patt.detection_patt);
if (mem) {
current_snr_units = &patt.snr_units;
current_snr_details = &patt - &snr_patts[0];
return redirect_win32_apis();
}
}