linux-kernel - Re: [RFC] Expose request

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Date:   Sun, 24 Oct 2021 11:38:19 +0200
From:   Thomas Weißschuh <thomas@...ch.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [RFC] Expose request_module via syscall

On 2021-09-19 09:56+0200, Thomas Weißschuh wrote:
> On 2021-09-18T11:47-0700, Andy Lutomirski wrote:
> > But I admit I’m a bit confused.  What exactly is the container doing that causes the container’s copy of modprobe to be called?
> 
> The container is running an instance of the docker daemon in swarm mode.
> That needs the "ip_vs" module (amongst others) and explicitly tries to load it
> via modprobe.

If somebody stumbles upon this specific issue:
The "ip_vs" module will be autoloaded in future kernel versions with
https://lore.kernel.org/lkml/20211021130255.4177-1-linux@weissschuh.net/
applied.

> > > If so the seccomp notifier can be used to intercept this system call for
> > > the container and verify the module against an allowlist similar to how
> > > we currently handle mount.
> > > 
> > > Christian