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

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Message-ID: <20240619151524.GB24240@redhat.com>
Date: Wed, 19 Jun 2024 17:15:24 +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

I don't understand what this patch does, but...

On 06/18, Tiezhu Yang wrote:
>
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -467,6 +467,7 @@ struct perf_event_attr {
>  		__u32		wakeup_watermark; /* bytes before wakeup   */
>  	};
>  
> +	__u8			bp_priv;
>  	__u32			bp_type;

Is it safe to add the new member in the middle of uapi struct?
This will break userspace...

Oleg.