Bug 792541 - Block sprotector.dll on Windows 8 and up. Add support in…

… the windows blocklist for flags and add a flag for "win8 and up only", r=ehsan a=akeybl

toolkit/xre/nsWindowsDllBlocklist.cpp

@@ -53,6 +53,11 @@ struct DllBlockInfo {
   // encoded as 0x AAAA BBBB CCCC DDDD ULL (spaces added for clarity),
   // but it's not required to be of that format.
   unsigned long long maxVersion;
+
+  enum {
+    FLAGS_DEFAULT = 0,
+    BLOCK_WIN8PLUS_ONLY = 1
+  } flags;
 };
 
 static DllBlockInfo sWindowsDllBlocklist[] = {
@@ -107,6 +112,8 @@ static DllBlockInfo sWindowsDllBlocklist[] = {
   // Topcrash with Babylon Toolbar on FF16+ (bug 721264)
   {"babyfox.dll", ALL_VERSIONS},
 
+  {"sprotector.dll", ALL_VERSIONS, DllBlockInfo::BLOCK_WIN8PLUS_ONLY },
+
   // leave these two in always for tests
   { "mozdllblockingtest.dll", ALL_VERSIONS },
   { "mozdllblockingtest_versioned.dll", 0x0000000400000000ULL },
@@ -286,6 +293,16 @@ wchar_t* getFullPath (PWCHAR filePath, wchar_t* fname)
   return full_fname;
 }
 
+static bool
+IsWin8OrLater()
+{
+  OSVERSIONINFOW osInfo;
+  osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
+  GetVersionExW(&osInfo);
+  return (osInfo.dwMajorVersion > 6) ||
+    (osInfo.dwMajorVersion >= 6 && osInfo.dwMinorVersion >= 2);
+}
+
 static NTSTATUS NTAPI
 patched_LdrLoadDll (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileName, PHANDLE handle)
 {
@@ -373,6 +390,11 @@ patched_LdrLoadDll (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileNam
     printf_stderr("LdrLoadDll: info->name: '%s'\n", info->name);
 #endif
 
+    if ((info->flags == DllBlockInfo::BLOCK_WIN8PLUS_ONLY) &&
+        !IsWin8OrLater()) {
+      goto continue_loading;
+    }
+
     if (info->maxVersion != ALL_VERSIONS) {
       ReentrancySentinel sentinel(dllName);
       if (sentinel.BailOut()) {