linux-kernel - Re: [PATCH] fork/pid: Fix use-after-free in __task_pid_nr

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Message-ID: <aV5zkjzLTwKQOn9D@redhat.com>
Date: Wed, 7 Jan 2026 15:54:10 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Qing Wang <wangqing7171@...il.com>
Cc: thaumy.love@...il.com, Liam.Howlett@...cle.com,
	akpm@...ux-foundation.org, brauner@...nel.org, bsegall@...gle.com,
	jack@...e.cz, joel.granados@...nel.org, juri.lelli@...hat.com,
	linux-kernel@...r.kernel.org, lorenzo.stoakes@...cle.com,
	mingo@...hat.com, mjguzik@...il.com, peterz@...radead.org,
	rostedt@...dmis.org, rppt@...nel.org,
	syzbot+e0378d4f4fe57aa2bdd0@...kaller.appspotmail.com
Subject: Re: [PATCH] fork/pid: Fix use-after-free in __task_pid_nr_ns

On 01/07, Qing Wang wrote:
>
> I agree with your idea. But we don't need to fix this issue anymore,
> because after reviewing the current mainline code, I found that it has
> already been resolved(c418d8b4d7a4 "perf/core: Fix missing read event
> generation on task exit") by moving sync_child_event() from
> perf_child_detach() into perf_event_exit_event().
>
> Here https://patch.msgid.link/20251209041600.963586-1-thaumy.love@gmail.com
>
> As a result, perf_event_read_event() no longer occurs on the problematic
> path reported (i.e., the close()->perf_release() path).

Great, thanks. So we can forget this problem ;)

Oleg.