linux-kernel - Re: [PATCH 2/8] tracing: tprobe-events: Reject invalid tracepoint name

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Message-ID: <20250226101052.2fa3ce66@gandalf.local.home>
Date: Wed, 26 Feb 2025 10:10:52 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Shuah Khan <shuah@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Hari Bathini <hbathini@...ux.ibm.com>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/8] tracing: tprobe-events: Reject invalid tracepoint
 name

On Wed, 26 Feb 2025 15:18:54 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Commit 57a7e6de9e30 ("tracing/fprobe: Support raw tracepoints on
> future loaded modules") allows user to set a tprobe on non-exist
> tracepoint but it does not check the tracepoint name is acceptable.
> So it leads tprobe has a wrong character for events (e.g. with
> subsystem prefix). In this case, the event is not shown in the
> events directory.
> 
> Reject such invalid tracepoint name.
> 
> The tracepoint name must consist of alphabet or digit or '_'.
> 
> Fixes: 57a7e6de9e30 ("tracing/fprobe: Support raw tracepoints on future loaded modules")
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> Cc: stable@...r.kernel.org

Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve


> ---
>  kernel/trace/trace_fprobe.c |   13 +++++++++++++
>  kernel/trace/trace_probe.h  |    1 +
>  2 files changed, 14 insertions(+)