linux-kernel - Re: [PATCH v5 06/12] unwind_user/sframe: Add prctl() interface for registering .sframe sections

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Message-ID: <5aaab4c0-accd-4b37-8093-d2664483f985@linux.ibm.com>
Date: Mon, 28 Apr 2025 11:00:52 +0200
From: Jens Remus <jremus@...ux.ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Indu Bhagat <indu.bhagat@...cle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        linux-toolchains@...r.kernel.org, Jordan Rome <jordalgo@...a.com>,
        Sam James <sam@...too.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Florian Weimer <fweimer@...hat.com>, Andy Lutomirski <luto@...nel.org>,
        Weinan Liu <wnliu@...gle.com>, Blake Jones <blakejones@...gle.com>,
        Beau Belgrave <beaub@...ux.microsoft.com>,
        "Jose E. Marchesi"
 <jemarch@....org>,
        Alexander Aring <aahringo@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: Re: [PATCH v5 06/12] unwind_user/sframe: Add prctl() interface for
 registering .sframe sections

On 24.04.2025 22:15, Steven Rostedt wrote:
> From: Josh Poimboeuf <jpoimboe@...nel.org>
> 
> The kernel doesn't have direct visibility to the ELF contents of shared
> libraries.  Add some prctl() interfaces which allow glibc to tell the
> kernel where to find .sframe sections.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>

> diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h

> +#define PR_ADD_SFRAME			78
> +#define PR_REMOVE_SFRAME		79

Note that those values have been bumped since Josh's v4.  Therefore
Josh's related Glibc patch needs to be updated and Glibc needs to be
rebuild as well.  Otherwise the Kernel won't be able to find any
.sframe sections for DSOs.

Regards,
Jens
-- 
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@...ibm.com

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