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

tracing: Verify event formats that have "%*p.."

The trace event verifier checks the formats of trace events to make sure
that they do not point at memory that is not in the trace event itself or
in data that will never be freed. If an event references data that was
allocated when the event triggered and that same data is freed before the
event is read, then the kernel can crash by reading freed memory.

The verifier runs at boot up (or module load) and scans the print formats
of the events and checks their arguments to make sure that dereferenced
pointers are safe. If the format uses "%*p.." the verifier will ignore it,
and that could be dangerous. Cover this case as well.

Also add to the sample code a use case of "%*pbl".

https://git.kernel.org/stable/c/03127354027508d076073b020d3070990fd6a958

https://git.kernel.org/stable/c/04b80d45ecfaf780981d6582899e3ab205e4aa08

https://git.kernel.org/stable/c/4d11fac941d83509be4e6a21038281d6d96da50c

https://git.kernel.org/stable/c/6854c87ac823181c810f8c07489ba543260c0023

https://git.kernel.org/stable/c/c7204fd1758c0caf1938e8a59809a1fdf28a8114

https://git.kernel.org/stable/c/ea8d7647f9ddf1f81e2027ed305299797299aa03