linux-kernel - Re: [PATCH v12 00/14] unwind_user: x86: Deferred unwinding infrastructure

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Message-ID: <202507011547.D291476BE1@keescook>
Date: Tue, 1 Jul 2025 15:49:23 -0700
From: Kees Cook <kees@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.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>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	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>
Subject: Re: [PATCH v12 00/14] unwind_user: x86: Deferred unwinding
 infrastructure

On Mon, Jun 30, 2025 at 10:45:39PM -0400, Steven Rostedt wrote:
> On Mon, 30 Jun 2025 19:06:12 -0700
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > On Mon, 30 Jun 2025 at 17:54, Steven Rostedt <rostedt@...dmis.org> wrote:
> > >
> > > This is the first patch series of a set that will make it possible to be able
> > > to use SFrames[1] in the Linux kernel. A quick recap of the motivation for
> > > doing this.  
> > 
> > You have a '[1]' to indicate there's a link to what SFrames are.
> [...]
>   [1] https://sourceware.org/binutils/wiki/sframe

Okay, I've read the cover letter and this wiki page, but I am dense: why
does the _kernel_ want to do this? Shouldn't it only be userspace that
cares about userspace unwinding? I don't use perf, ftrace, and ebpf
enough to make this obvious to me, I guess. ;)

-- 
Kees Cook