linux-kernel - Re: [PATCH] ipv6: delay procfs initialization after the ipv6 structs are ready

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Message-ID: <20240320203941.70facba3@kernel.org>
Date: Wed, 20 Mar 2024 20:39:41 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
Cc: "David S. Miller" <davem@...emloft.net>, David Ahern
 <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv6: delay procfs initialization after the ipv6
 structs are ready

On Wed, 20 Mar 2024 18:17:36 +0100 Nicolas Cavallari wrote:
> procfs files are created before the structure they reference are
> initialized.  For example, if6_proc_init() creates procfs files that
> access structures initialized by addrconf_init().
> 
> If ipv6 is compiled as a module and a program manages to open an ipv6
> procfs file during the loading of the module, it can oops the kernel.
> 
> It appears that we were unlucky enough to reproduce this problem
> multiple times already, out of maybe 100 boots:

I haven't investigated too closely but looks like this breaks
all selftests. Please run all net/forwarding selftests before
posting v2?