fix(inject): set read_image_file_exec_options to 0

cxx-shared/cxx-shared.vcxitems

@@ -18,6 +18,7 @@
     <ClInclude Include="$(MSBuildThisFileDirectory)shared\defer.hpp" />
     <ClInclude Include="$(MSBuildThisFileDirectory)shared\ipc.hpp" />
     <ClInclude Include="$(MSBuildThisFileDirectory)shared\names.hpp" />
+    <ClInclude Include="$(MSBuildThisFileDirectory)shared\native.hpp" />
     <ClInclude Include="$(MSBuildThisFileDirectory)shared\util.hpp" />
   </ItemGroup>
 </Project>

cxx-shared/shared/native.hpp

@@ -0,0 +1,31 @@
+#pragma once
+#include <stdexcept>
+#include <Windows.h>
+
+#pragma pack(push, 1)
+namespace native {
+    class PEB {
+    public:
+        std::uint8_t inherited_address_space;
+        std::uint8_t read_image_file_exec_options;
+        /// - we don't need other fields
+    };
+
+    static_assert(offsetof(PEB, read_image_file_exec_options) == 1);
+
+    inline PEB* get_peb() {
+        static auto function = reinterpret_cast<PEB* (*)()>(GetProcAddress(GetModuleHandleA("ntdll.dll"), "RtlGetCurrentPeb"));
+
+        if (function == nullptr) {
+            throw std::runtime_error("no RtlGetCurrentPeb");
+        }
+
+        static auto result = function();
+        if (result == nullptr) [[unlikely]] {
+            throw std::runtime_error("no peb");
+        }
+
+        return result;
+    }
+} // namespace native
+#pragma pack(pop)

defendnot-loader/core/inject.cpp

@@ -1,6 +1,8 @@
 #include "core/core.hpp"
 
 #include "shared/defer.hpp"
+#include "shared/native.hpp"
+
 #include <print>
 #include <stdexcept>
 
@@ -19,6 +21,9 @@ namespace loader {
             .bInheritHandle = TRUE,
         };
 
+        /// \xref: https://github.com/es3n1n/defendnot/issues/7#issuecomment-2874903650
+        native::get_peb()->read_image_file_exec_options = 0;
+
         std::println("** booting {}", proc_name);
         if (!CreateProcessA(nullptr, const_cast<char*>(proc_name.data()), &sa, &sa, FALSE, CREATE_SUSPENDED, nullptr, nullptr, &si, &pi)) {
             throw std::runtime_error(std::format("unable to create process: {}", GetLastError()));