Vulnerability CVE-2021-47360
Published: 2024-05-21

Description:
In the Linux kernel, the following vulnerability has been resolved:

binder: make sure fd closes complete

During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object
cleanup may close 1 or more fds. The close operations are
completed using the task work mechanism -- which means the thread
needs to return to userspace or the file object may never be
dereferenced -- which can lead to hung processes.

Force the binder thread back to userspace if an fd is closed during
BC_FREE_BUFFER handling.

 References:
https://git.kernel.org/stable/c/aa2c274c279ff365a06a4cba263f04965895166e
https://git.kernel.org/stable/c/d5b0473707fa53b03a5db0256ce62b2874bddbc7
https://git.kernel.org/stable/c/b95483d8d94b41fa31a84c1d86710b7907a37621
https://git.kernel.org/stable/c/5fdb55c1ac9585eb23bb2541d5819224429e103d
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