[Webkit-unassigned] [Bug 238442] New: SharedArrayBuffers do not get cloned on some messaging APIs
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Mar 28 03:31:51 PDT 2022
https://bugs.webkit.org/show_bug.cgi?id=238442
Bug ID: 238442
Summary: SharedArrayBuffers do not get cloned on some messaging
APIs
Product: WebKit
Version: Safari 15
Hardware: Mac (Intel)
OS: macOS 11
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: vidal.roberto.j at gmail.com
Created attachment 455893
--> https://bugs.webkit.org/attachment.cgi?id=455893&action=review
reproduction with visible console and Safari version
Example repro: https://github.com/jrvidal/message-port-repro/tree/master/clone
Working deployment: https://sab-clone.herokuapp.com/
When sending a message containing a `SharedArrayBuffer`, the receiving end sometimes receives a regular, deep copied `ArrayBuffer` instead of a proper clone pointing to the same bytes.
In the example provided, it can be consistently reproduced when posting a message through a `MessagePort` or a `BroadcastChannel`.
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