Having this in Yama would also make it probable that there would be a security-centric default. It would end up wiping out unprivileged perf events access on distributions using Yama for ptrace_scope unless they make the explicit decision to disable it. Having the perf subsystem extend the existing perf_event_paranoid sysctl leaves the control over the upstream default in the hands of the perf subsystem, not LSMs.
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