[PATCH v4 2/9] perf/core: open access for CAP_SYS_PERFMON privileged process

Arnaldo Carvalho de Melo arnaldo.melo at gmail.com
Sat Jan 11 03:45:31 AEDT 2020


Em Sat, Jan 11, 2020 at 12:52:13AM +0900, Masami Hiramatsu escreveu:
> On Fri, 10 Jan 2020 15:02:34 +0100 Peter Zijlstra <peterz at infradead.org> wrote:
> > Again, this only allows attaching to previously created kprobes, it does
> > not allow creating kprobes, right?

> > That is; I don't think CAP_SYS_PERFMON should be allowed to create
> > kprobes.

> > As might be clear; I don't actually know what the user-ABI is for
> > creating kprobes.

> There are 2 ABIs nowadays, ftrace and ebpf. perf-probe uses ftrace interface to
> define new kprobe events, and those events are treated as completely same as
> tracepoint events. On the other hand, ebpf tries to define new probe event
> via perf_event interface. Above one is that interface. IOW, it creates new kprobe.

Masami, any plans to make 'perf probe' use the perf_event_open()
interface for creating kprobes/uprobes?

- Arnaldo


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