linux-kernel - Re: [PATCH v3 3/7] seccomp: keep track of seccomp filters with closed listeners

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Message-ID: <2026-01-21-losing-next-board-lamp-aBQSVB@cyphar.com>
Date: Wed, 21 Jan 2026 13:20:22 +0100
From: Aleksa Sarai <cyphar@...har.com>
To: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
Cc: kees@...nel.org, linux-kernel@...r.kernel.org, 
	Andy Lutomirski <luto@...capital.net>, Will Drewry <wad@...omium.org>, Jonathan Corbet <corbet@....net>, 
	Shuah Khan <shuah@...nel.org>, Tycho Andersen <tycho@...ho.pizza>, 
	Andrei Vagin <avagin@...il.com>, Christian Brauner <brauner@...nel.org>, 
	Stéphane Graber <stgraber@...raber.org>
Subject: Re: [PATCH v3 3/7] seccomp: keep track of seccomp filters with
 closed listeners

On 2025-12-11, Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com> wrote:
> Let's distinguish seccomp filters with closed listener
> vs seccomp filters which never had listener.
> 
> We can easily do this by using the same ->notif pointer
> field with help of IS_ERR_OR_NULL().
> 
> No functional change intended.

The discussion we had at LPC made me think this would result in a
(justifiable) functional change to fix this bug, but you're quite right
that this only matters once you enable nested listeners.

In either case, feel free to take my

Reviewed-by: Aleksa Sarai <cyphar@...har.com>

Thanks!

-- 
Aleksa Sarai
https://www.cyphar.com/

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