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Vulnerability CVE-2021-47577
Published: 2024-06-19
| Description: |
In the Linux kernel, the following vulnerability has been resolved:
io-wq: check for wq exit after adding new worker task_work
We check IO_WQ_BIT_EXIT before attempting to create a new worker, and
wq exit cancels pending work if we have any. But it's possible to have
a race between the two, where creation checks exit finding it not set,
but we're in the process of exiting. The exit side will cancel pending
creation task_work, but there's a gap where we add task_work after we've
canceled existing creations at exit time.
Fix this by checking the EXIT bit post adding the creation task_work.
If it's set, run the same cancelation that exit does. |
References: |
https://git.kernel.org/stable/c/4b4e5bbf9386d4ec21d91c0cb0fd60b9bba778ec
https://git.kernel.org/stable/c/71a85387546e50b1a37b0fa45dadcae3bfb35cf6
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