linux-kernel - Re: [PATCH v4 9/9] Documentation: tracing: Add a note about argument and retval access

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CABRcYmJcii6UzJR+jksg9SMYAYZRNqEhKoHp=V2xiPYh76Q2vg@mail.gmail.com>
Date:   Fri, 25 Aug 2023 18:12:14 +0200
From:   Florent Revest <revest@...omium.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 9/9] Documentation: tracing: Add a note about argument
 and retval access

On Wed, Aug 23, 2023 at 5:17 PM Masami Hiramatsu (Google)
<mhiramat@...nel.org> wrote:
> diff --git a/Documentation/trace/fprobetrace.rst b/Documentation/trace/fprobetrace.rst
> index 8e9bebcf0a2e..e35e6b18df40 100644
> --- a/Documentation/trace/fprobetrace.rst
> +++ b/Documentation/trace/fprobetrace.rst
> @@ -59,8 +59,12 @@ Synopsis of fprobe-events
>                    and bitfield are supported.
>
>    (\*1) This is available only when BTF is enabled.
> -  (\*2) only for the probe on function entry (offs == 0).
> -  (\*3) only for return probe.
> +  (\*2) only for the probe on function entry (offs == 0). Note, this argument access
> +        is best effort, because depending on the argument type, it may be passed on
> +        the stack. But this only support the arguments via registers.

supports*

Otherwise:
Acked-by: Florent Revest <revest@...omium.org>