[Webkit-unassigned] [Bug 141317] New: MachineThreads should be ref counted
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Feb 5 18:25:30 PST 2015
https://bugs.webkit.org/show_bug.cgi?id=141317
Bug ID: 141317
Summary: MachineThreads should be ref counted
Classification: Unclassified
Product: WebKit
Version: 528+ (Nightly build)
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: mark.lam at apple.com
The VM's MachineThreads registry object is being referenced from other threads as a raw pointer. In a scenario where the VM is destructed on the main thread, there is no guarantee that another thread isn't still holding a reference to the registry and will eventually invoke removeThread() on it on thread exit. Hence, there's a possible use after free scenario here.
The fix is to make MachineThreads ThreadSafeRefCounted, and have all threads that references keep a RefPtr to it to ensure that it stays alive until the very last thread is done with it.
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