Re: [PATCH] arm64: hw_breakpoint: Save privilege of access control via ptrace

Oleg Nesterov
2024-06-20T10:37:48Z

Again, I can't really comment, I know almost nothing about perf, but

On 06/20, Tiezhu Yang wrote:
>
> On 06/20/2024 05:08 PM, Oleg Nesterov wrote:
> >
> >But to me the very idea of arm64-specific and "kernel only" member in
> >perf_event_attr looks a bit strange.
>
> I noticed that there is a similar arm64-specific change in
> commit 09519ec3b19e ("perf: Add perf_event_attr::config3")

but this is another thing even if I have no idea what .config3 means.

If nothing else, what do you think, say, tools/perf can do with ->bp_priv?

What should sys_perf_event_open() do if bp_priv != 0 comes from user space?

Nevermind, please forget, I leave this to you and maintainers.

Oleg.