coresight: Don't use contextID with PID namespaces
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Cover letter [PATCH 0/3] coresight: Don't use contextID with PID namespaces
Quoted 8 lines · Mathieu Poirier
Since the in-kernel value of a PID differs from what is seen from PID namespaces, using contextID tracing with PID namespaces makes the feature confusing to use and potentially subject to leaking out internal kernel information.
This set returns an error if contextID and PID namespaces are used in conjunction and gets rid of the vpid-to-pid translation function as it is no longer needed.
I looked the file can only be written by root. So limiting things to the initial pid namespace seems like the right solutions. Especially as the trace stream will include the global pid and be available to the tracer.
This sounds like a simple code with a minimal chance of breaking userspace.