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-rw-r--r--toolkit/mozapps/update/updater/loaddlls.cpp103
1 files changed, 103 insertions, 0 deletions
diff --git a/toolkit/mozapps/update/updater/loaddlls.cpp b/toolkit/mozapps/update/updater/loaddlls.cpp
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+++ b/toolkit/mozapps/update/updater/loaddlls.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <windows.h>
+
+// Delayed load libraries are loaded when the first symbol is used.
+// The following ensures that we load the delayed loaded libraries from the
+// system directory.
+struct AutoLoadSystemDependencies
+{
+ AutoLoadSystemDependencies()
+ {
+ // Remove the current directory from the search path for dynamically loaded
+ // DLLs as a precaution. This call has no effect for delay load DLLs.
+ SetDllDirectory(L"");
+
+ HMODULE module = ::GetModuleHandleW(L"kernel32.dll");
+ if (module) {
+ // SetDefaultDllDirectories is always available on Windows 8 and above. It
+ // is also available on Windows Vista, Windows Server 2008, and
+ // Windows 7 when MS KB2533623 has been applied.
+ decltype(SetDefaultDllDirectories)* setDefaultDllDirectories =
+ (decltype(SetDefaultDllDirectories)*) GetProcAddress(module, "SetDefaultDllDirectories");
+ if (setDefaultDllDirectories) {
+ setDefaultDllDirectories(LOAD_LIBRARY_SEARCH_SYSTEM32);
+ return;
+ }
+ }
+
+ // When SetDefaultDllDirectories is not available, fallback to preloading
+ // dlls. The order that these are loaded does not matter since they are
+ // loaded using the LOAD_WITH_ALTERED_SEARCH_PATH flag.
+#ifdef HAVE_64BIT_BUILD
+ // DLLs for Firefox x64 on Windows 7 (x64).
+ // Note: dwmapi.dll is preloaded since a crash will try to load it from the
+ // application's directory.
+ static LPCWSTR delayDLLs[] = { L"apphelp.dll",
+ L"cryptbase.dll",
+ L"cryptsp.dll",
+ L"dwmapi.dll",
+ L"mpr.dll",
+ L"ntmarta.dll",
+ L"profapi.dll",
+ L"propsys.dll",
+ L"sspicli.dll",
+ L"wsock32.dll" };
+
+#else
+ // DLLs for Firefox x86 on Windows XP through Windows 7 (x86 and x64).
+ // Note: dwmapi.dll is preloaded since a crash will try to load it from the
+ // application's directory.
+ static LPCWSTR delayDLLs[] = { L"apphelp.dll",
+ L"crypt32.dll",
+ L"cryptbase.dll",
+ L"cryptsp.dll",
+ L"dwmapi.dll",
+ L"mpr.dll",
+ L"msasn1.dll",
+ L"ntmarta.dll",
+ L"profapi.dll",
+ L"propsys.dll",
+ L"psapi.dll",
+ L"secur32.dll",
+ L"sspicli.dll",
+ L"userenv.dll",
+ L"uxtheme.dll",
+ L"ws2_32.dll",
+ L"ws2help.dll",
+ L"wsock32.dll" };
+#endif
+
+ WCHAR systemDirectory[MAX_PATH + 1] = { L'\0' };
+ // If GetSystemDirectory fails we accept that we'll load the DLLs from the
+ // normal search path.
+ GetSystemDirectoryW(systemDirectory, MAX_PATH + 1);
+ size_t systemDirLen = wcslen(systemDirectory);
+
+ // Make the system directory path terminate with a slash
+ if (systemDirectory[systemDirLen - 1] != L'\\' && systemDirLen) {
+ systemDirectory[systemDirLen] = L'\\';
+ ++systemDirLen;
+ // No need to re-null terminate
+ }
+
+ // For each known DLL ensure it is loaded from the system32 directory
+ for (size_t i = 0; i < sizeof(delayDLLs) / sizeof(delayDLLs[0]); ++i) {
+ size_t fileLen = wcslen(delayDLLs[i]);
+ wcsncpy(systemDirectory + systemDirLen, delayDLLs[i],
+ MAX_PATH - systemDirLen);
+ if (systemDirLen + fileLen <= MAX_PATH) {
+ systemDirectory[systemDirLen + fileLen] = L'\0';
+ } else {
+ systemDirectory[MAX_PATH] = L'\0';
+ }
+ LPCWSTR fullModulePath = systemDirectory; // just for code readability
+ // LOAD_WITH_ALTERED_SEARCH_PATH makes a dll look in its own directory for
+ // dependencies and is only available on Win 7 and below.
+ LoadLibraryExW(fullModulePath, nullptr, LOAD_WITH_ALTERED_SEARCH_PATH);
+ }
+ }
+} loadDLLs;