netdev - Re: [PATCH v2 2/2] selinux: Implement mptcp_add

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Message-ID: <1947d38c30b18829a5c122025c52847e.paul@paul-moore.com>
Date: Thu, 18 May 2023 13:12:00 -0400
From: Paul Moore <paul@...l-moore.com>
To: Matthieu Baerts <matthieu.baerts@...sares.net>, James Morris <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>, Stephen Smalley <stephen.smalley.work@...il.com>, Eric Paris <eparis@...isplace.org>
Cc: Paolo Abeni <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Ondrej Mosnacek <omosnace@...hat.com>, mptcp@...ts.linux.dev, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, linux-security-module@...r.kernel.org, selinux@...r.kernel.org, Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH v2 2/2] selinux: Implement mptcp_add_subflow hook

On Apr 20, 2023 Matthieu Baerts <matthieu.baerts@...sares.net> wrote:
> 
> Newly added subflows should inherit the LSM label from the associated
> MPTCP socket regardless of the current context.
> 
> This patch implements the above copying sid and class from the MPTCP
> socket context, deleting the existing subflow label, if any, and then
> re-creating the correct one.
> 
> The new helper reuses the selinux_netlbl_sk_security_free() function,
> and the latter can end-up being called multiple times with the same
> argument; we additionally need to make it idempotent.
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> Acked-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> ---
> v2:
>  - Address Paul's comments:
>    - use "MPTCP socket" instead of "msk" in the commit message
>    - "updated" context instead of "current" one in the comment
> ---
>  security/selinux/hooks.c    | 16 ++++++++++++++++
>  security/selinux/netlabel.c |  8 ++++++--
>  2 files changed, 22 insertions(+), 2 deletions(-)

Also merged into selinux/next, thanks again.

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