GCC 4.6 warnings cleanup

madvise.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "debug.h"
 #include "sandbox_impl.h"
 
 namespace playground {
 
 long Sandbox::sandbox_madvise(void* start, size_t length, int advice) {
@@ skipping 20 matching lines @@
       sizeof(madvise_req)) {
     die("Failed to read parameters for madvise() [process]");
   }
   switch (madvise_req.advice) {
     case MADV_NORMAL:
     case MADV_RANDOM:
     case MADV_SEQUENTIAL:
     case MADV_WILLNEED:
     ok:
       SecureMem::sendSystemCall(*info, SecureMem::SEND_UNLOCKED,
-                                madvise_req.start, madvise_req.len,
-                                madvise_req.advice);
+                                const_cast<void*>(madvise_req.start),
+                                madvise_req.len, madvise_req.advice);
       return true;
     default:
       // All other flags to madvise() are potential dangerous (as opposed to
       // merely affecting overall performance). Do not allow them on memory
       // ranges that were part of the original mappings.
       if (isRegionProtected((void *) madvise_req.start, madvise_req.len)) {
         SecureMem::abandonSystemCall(*info, -EINVAL);
         return false;
       }
 
       // Changing attributes on memory regions that were newly mapped inside of
       // the sandbox is OK.
       goto ok;
   }
 }
 
 } // namespace