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

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Message-ID: <20240620103600.GD30070@redhat.com>
Date: Thu, 20 Jun 2024 12:36:00 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: hw_breakpoint: Save privilege of access control
 via ptrace

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.