linux-kernel - Re: [PATCH v2] ftrace: Fix possible use-after-free issue in ftrace

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Message-ID: <bf870914-3845-4d2a-b7cf-d7f9ef28e0b9@web.de>
Date: Tue, 16 Apr 2024 17:57:33 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Zheng Yejian <zhengyejian1@...wei.com>,
 linux-trace-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Mark Rutland <mark.rutland@....com>, Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ftrace: Fix possible use-after-free issue in
 ftrace_location()

…
> To fix it, we hold rcu lock as lookuping ftrace record, and call
> synchronize_rcu() before freeing any ftrace pages.

I suggest to convert this description into an imperative wording.

Regards,
Markus