linux-kernel - Re: [PATCH v8 10/12] unwind_user/sframe: Enable debugging in uaccess regions

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Message-ID: <CAHk-=wgXcc99EXKfK++FEQzMQc8S16WOwvn=1DcP_ns1jCCYeA@mail.gmail.com>
Date: Tue, 8 Jul 2025 08:53:56 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Steven Rostedt <rostedt@...nel.org>, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	bpf@...r.kernel.org, x86@...nel.org, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Andrii Nakryiko <andrii@...nel.org>, 
	Indu Bhagat <indu.bhagat@...cle.com>, "Jose E. Marchesi" <jemarch@....org>, 
	Beau Belgrave <beaub@...ux.microsoft.com>, Jens Remus <jremus@...ux.ibm.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Jens Axboe <axboe@...nel.dk>, 
	Florian Weimer <fweimer@...hat.com>, Sam James <sam@...too.org>
Subject: Re: [PATCH v8 10/12] unwind_user/sframe: Enable debugging in uaccess regions

On Tue, 8 Jul 2025 at 07:41, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> Would something like this work? If someone enables the config to enable the
> validation, I don't think we need dynamic printk to do it (as that requires
> passing in the format directly and not via a pointer).

I really think you should just not use 'user_access_begin()" AT ALL if
you need to play these kinds of games.

               Linus