Issue 1283 - wrong usage of memset, fix sizeof, make proper initializing

src/plugin/AdblockPlusClient.cpp

 #include "PluginStdAfx.h"
 #include "PluginSettings.h"
 #include "PluginSystem.h"
 #include "PluginFilter.h"
 #include "PluginClientFactory.h"
 #include "PluginMutex.h"
 #include "PluginClass.h"
 
 #include "AdblockPlusClient.h"
 
@@ skipping 46 matching lines @@
 
       PSID integritySid = 0;
       ConvertStringSidToSid(L"S-1-16-4096", &integritySid);
       std::tr1::shared_ptr<SID> sharedIntegritySid(static_cast<SID*>(integritySid), FreeSid); // Just to simplify cleanup
 
       TOKEN_MANDATORY_LABEL tml = {};
       tml.Label.Attributes = SE_GROUP_INTEGRITY;
       tml.Label.Sid = integritySid;
 
       // Set the process integrity level
-      SetTokenInformation(newToken, TokenIntegrityLevel, &tml, sizeof(tml));
+      SetTokenInformation(newToken, TokenIntegrityLevel, &tml, sizeof(TOKEN_MANDATORY_LABEL) + GetLengthSid(integritySid));
 
       STARTUPINFO startupInfo = {};
       PROCESS_INFORMATION processInformation = {};
 
       createProcRes = CreateProcessAsUserW(newToken, engineExecutablePath.c_str(), params.GetBuffer(params.GetLength() + 1),
                               0, 0, false, 0, 0, 0, (STARTUPINFOW*)&startupInfo, &processInformation);
     }
 
     if (!createProcRes)
     {
@@ skipping 492 matching lines @@
   DEBUG_GENERAL("CompareVersions");
   Communication::OutputBuffer request;
   request << Communication::PROC_COMPARE_VERSIONS << ToUtf8String(v1) << ToUtf8String(v2);
   Communication::InputBuffer response;
   if (!CallEngine(request, response))
     return 0;
   int result;
   response >> result;
   return result;
 }