Vulnerability CVE-2022-48939
Published: 2024-08-22

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

bpf: Add schedule points in batch ops

syzbot reported various soft lockups caused by bpf batch operations.

INFO: task kworker/1:1:27 blocked for more than 140 seconds.
INFO: task hung in rcu_barrier

Nothing prevents batch ops to process huge amount of data,
we need to add schedule points in them.

Note that maybe_wait_bpf_programs(map) calls from
generic_map_delete_batch() can be factorized by moving
the call after the loop.

This will be done later in -next tree once we get this fix merged,
unless there is strong opinion doing this optimization sooner.

 References:
https://git.kernel.org/stable/c/7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b
https://git.kernel.org/stable/c/8628f489b749a4f9767991631921dbe3fbcdc784
https://git.kernel.org/stable/c/7e8099967d0e3ff9d1ae043e80b27fbe46c08417
https://git.kernel.org/stable/c/75134f16e7dd0007aa474b281935c5f42e79f2c8
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