linux-kernel - Re: 答复: [External Mail]Re: [PATCH] pid: Add a judgment for ns null in pid_nr

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Message-ID: <20250802055405.GV222315@ZenIV>
Date: Sat, 2 Aug 2025 06:54:05 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: 高翔 <gaoxiang17@...omi.com>
Cc: Xiang Gao <gxxa03070307@...il.com>,
	"brauner@...nel.org" <brauner@...nel.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"mjguzik@...il.com" <mjguzik@...il.com>,
	"Liam.Howlett@...cle.com" <Liam.Howlett@...cle.com>,
	"joel.granados@...nel.org" <joel.granados@...nel.org>,
	"lorenzo.stoakes@...cle.com" <lorenzo.stoakes@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 答复: [External Mail]Re:
 [PATCH] pid: Add a judgment for ns null in pid_nr_ns

On Sat, Aug 02, 2025 at 06:52:52AM +0100, Al Viro wrote:

> ... for asynchronous callbacks if that sort there is no such thing as the current
                                 of, even...
> process.  At all.  Using current, let alone looking for its PID, userns, etc. in
> such context is a bug.  Don't do it.  It's a bug in your module.