linux-kernel - Re: [RFC PATCH v1 1/1] tracing/kprobe: Add multi-probe support for 'perf

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Message-ID: <4853240.31r3eYUQgx@pwmachine>
Date:   Fri, 18 Aug 2023 20:13:43 +0200
From:   Francis Laniel <flaniel@...ux.microsoft.com>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 1/1] tracing/kprobe: Add multi-probe support for 'perf_kprobe' PMU

Hi.

Le vendredi 18 août 2023, 17:41:41 CEST Steven Rostedt a écrit :
> On Fri, 18 Aug 2023 21:37:05 +0900
> 
> Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:
> > That's why perf probe uses the offset from '_text'. Normal KASLR will just
> > moves all symbols. (Finer one will move all symbols randomely)
> > This should not need to access /proc/kallsyms but vmlinux or SystemMap.
> 
> We could just pass in: "_text+offset" too.

So, the idea would be to change the existing create_local_trace_kprobe() and 
above functions to indicate the user's offset is to be used against _text and 
not address?

> -- Steve

Best regards.