[SYCL] Limit the directories that are searched when loading dependencies of the plugins (#12336)

Currently the default search order is used when loading dependencies of
the plugins (these dependencies include the Level Zero loader and the
ICD loader for opencl and level zero plugins respectively) and that list
includes current directory and some other directories which are not
considered safe. This patch limits the list of directories when loading
the dependencies of the plugins. See:
https://learn.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-loadlibraryexa
for reference.

---------

Co-authored-by: aelovikov-intel <[email protected]>

Author: againull

sycl/pi_win_proxy_loader/pi_win_proxy_loader.cpp

@@ -133,31 +133,23 @@ void preloadLibraries() {
 
   MapT &dllMap = getDllMap();
 
-  auto ocl_path = LibSYCLDir / __SYCL_OPENCL_PLUGIN_NAME;
-  dllMap.emplace(ocl_path,
-                 LoadLibraryEx(ocl_path.wstring().c_str(), NULL, NULL));
-
-  auto l0_path = LibSYCLDir / __SYCL_LEVEL_ZERO_PLUGIN_NAME;
-  dllMap.emplace(l0_path, LoadLibraryEx(l0_path.wstring().c_str(), NULL, NULL));
-
-  auto cuda_path = LibSYCLDir / __SYCL_CUDA_PLUGIN_NAME;
-  dllMap.emplace(cuda_path,
-                 LoadLibraryEx(cuda_path.wstring().c_str(), NULL, NULL));
-
-  auto esimd_path = LibSYCLDir / __SYCL_ESIMD_EMULATOR_PLUGIN_NAME;
-  dllMap.emplace(esimd_path,
-                 LoadLibraryEx(esimd_path.wstring().c_str(), NULL, NULL));
-
-  auto hip_path = LibSYCLDir / __SYCL_HIP_PLUGIN_NAME;
-  dllMap.emplace(hip_path,
-                 LoadLibraryEx(hip_path.wstring().c_str(), NULL, NULL));
-
-  auto ur_path = LibSYCLDir / __SYCL_UNIFIED_RUNTIME_PLUGIN_NAME;
-  dllMap.emplace(ur_path, LoadLibraryEx(ur_path.wstring().c_str(), NULL, NULL));
-
-  auto nativecpu_path = LibSYCLDir / __SYCL_NATIVE_CPU_PLUGIN_NAME;
-  dllMap.emplace(nativecpu_path,
-                 LoadLibraryEx(nativecpu_path.wstring().c_str(), NULL, NULL));
+  // When searching for dependencies of the plugins limit the
+  // list of directories to %windows%\system32 and the directory that contains
+  // the loaded DLL (the plugin). This is necessary to avoid loading dlls from
+  // current directory and some other directories which are considered unsafe.
+  auto loadPlugin = [&](auto pluginName,
+                        DWORD flags = LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR |
+                                      LOAD_LIBRARY_SEARCH_SYSTEM32) {
+    auto path = LibSYCLDir / pluginName;
+    dllMap.emplace(path, LoadLibraryEx(path.wstring().c_str(), NULL, flags));
+  };
+  loadPlugin(__SYCL_OPENCL_PLUGIN_NAME);
+  loadPlugin(__SYCL_LEVEL_ZERO_PLUGIN_NAME);
+  loadPlugin(__SYCL_CUDA_PLUGIN_NAME);
+  loadPlugin(__SYCL_ESIMD_EMULATOR_PLUGIN_NAME);
+  loadPlugin(__SYCL_HIP_PLUGIN_NAME);
+  loadPlugin(__SYCL_UNIFIED_RUNTIME_PLUGIN_NAME);
+  loadPlugin(__SYCL_NATIVE_CPU_PLUGIN_NAME);
 
   // Restore system error handling.
   (void)SetErrorMode(SavedMode);