[Backport] CVE-2021-21148: Heap buffer overflow in V8

Manual backport of patch originally reviewed on
https://chromium-review.googlesource.com/c/v8/v8/+/2674169:
[Merged ][wasm] PostMessage of Memory.buffer should throw

PostMessage of an ArrayBuffer that is not detachable should result
in a DataCloneError.

[email protected]

(cherry picked from commit dfcf1e86fac0a7b067caf8fdfc13eaf3e3f445e4)

Bug: chromium:1170176, chromium:961059
No-Try: true
No-Presubmit: true
No-Tree-Checks: true
Change-Id: Ife852df032841b7001375acd5e101d614c4b0771
Reviewed-by: Zhi An Ng <[email protected]>
Commit-Queue: Zhi An Ng <[email protected]>
Cr-Commit-Position: refs/branch-heads/8.8@{#30}
Cr-Branched-From: 2dbcdc105b963ee2501c82139eef7e0603977ff0-refs/heads/8.8.278@{#1}
Cr-Branched-From: 366d30c99049b3f1c673f8a93deb9f879d0fa9f0-refs/heads/master@{#71094}
Reviewed-by: Michal Klocek <[email protected]>

chromium/v8/src/messages.h

@@ -751,6 +751,8 @@ class ErrorUtils : public AllStatic {
   T(DataCloneErrorOutOfMemory, "Data cannot be cloned, out of memory.")        \
   T(DataCloneErrorNeuteredArrayBuffer,                                         \
     "An ArrayBuffer is neutered and could not be cloned.")                     \
+  T(DataCloneErrorNonNeuterableArrayBuffer,                                   \
+    "ArrayBuffer is not neuterable and could not be cloned.")                  \
   T(DataCloneErrorSharedArrayBufferTransferred,                                \
     "A SharedArrayBuffer could not be cloned. SharedArrayBuffer must not be "  \
     "transferred.")                                                            \

chromium/v8/src/value-serializer.cc

@@ -824,6 +824,12 @@ Maybe<bool> ValueSerializer::WriteJSArrayBuffer(
     return ThrowIfOutOfMemory();
   }
 
+  if (!array_buffer->is_neuterable()) {
+    ThrowDataCloneError(
+        MessageTemplate::kDataCloneErrorNonNeuterableArrayBuffer);
+    return Nothing<bool>();
+  }
+
   uint32_t* transfer_entry = array_buffer_transfer_map_.Find(array_buffer);
   if (transfer_entry) {
     WriteTag(SerializationTag::kArrayBufferTransfer);