CVE-2021-47360 Information

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.

Reference

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