[M54 merge] Lock down creation of blob:chrome-extension URLs from non-extension processes.

content/browser/blob_storage/blob_dispatcher_host.cc

 // Copyright 2016 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 "content/browser/blob_storage/blob_dispatcher_host.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 286 matching lines @@
           context);
       Send(new BlobStorageMsg_CancelBuildingBlob(
           uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING));
     }
   }
 }
 
 void BlobDispatcherHost::OnRegisterPublicBlobURL(const GURL& public_url,
                                                  const std::string& uuid) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  BlobStorageContext* context = this->context();
+  ChildProcessSecurityPolicyImpl* security_policy =
+      ChildProcessSecurityPolicyImpl::GetInstance();
+
+  // Blob urls have embedded origins. A frame should only be creating blob URLs
+  // in the origin of its current document. Make sure that the origin advertised
+  // on the URL is allowed to be rendered in this process.
+  if (!public_url.SchemeIsBlob() ||
+      !security_policy->CanCommitURL(process_id_, public_url)) {
+    bad_message::ReceivedBadMessage(this, bad_message::BDH_DISALLOWED_ORIGIN);
+    return;
+  }
   if (uuid.empty()) {
     bad_message::ReceivedBadMessage(this,
                                     bad_message::BDH_INVALID_URL_OPERATION);
     return;
   }
+  BlobStorageContext* context = this->context();
   if (!IsInUseInHost(uuid) || context->registry().IsURLMapped(public_url)) {
     UMA_HISTOGRAM_ENUMERATION("Storage.Blob.InvalidURLRegister", BDH_INCREMENT,
                               BDH_TRACING_ENUM_LAST);
     return;
   }
   context->RegisterPublicBlobURL(public_url, uuid);
   public_blob_urls_.insert(public_url);
 }
 
 void BlobDispatcherHost::OnRevokePublicBlobURL(const GURL& public_url) {
@@ skipping 75 matching lines @@
     context->RevokePublicBlobURL(url);
   }
   for (const auto& uuid_refnum_pair : blobs_inuse_map_) {
     for (int i = 0; i < uuid_refnum_pair.second; ++i)
       context->DecrementBlobRefCount(uuid_refnum_pair.first);
   }
   async_builder_.CancelAll(context);
 }
 
 }  // namespace content