netdev - Re: [PATCH net] netlabel: cope with NULL catmap

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Date:   Tue, 12 May 2020 17:10:05 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-security-module@...r.kernel.org, ppandit@...hat.com,
        Matthew Sheets <matthew.sheets@...ms.com>
Subject: Re: [PATCH net] netlabel: cope with NULL catmap

On Tue, May 12, 2020 at 8:44 AM Paolo Abeni <pabeni@...hat.com> wrote:
>
> The cipso and calipso code can set the MLS_CAT attribute on
> successful parsing, even if the corresponding catmap has
> not been allocated, as per current configuration and external
> input.
>
> Later, selinux code tries to access the catmap if the MLS_CAT flag
> is present via netlbl_catmap_getlong(). That may cause null ptr
> dereference while processing incoming network traffic.
>
> Address the issue setting the MLS_CAT flag only if the catmap is
> really allocated. Additionally let netlbl_catmap_getlong() cope
> with NULL catmap.
>
> Reported-by: Matthew Sheets <matthew.sheets@...ms.com>
> Fixes: 4b8feff251da ("netlabel: fix the horribly broken catmap functions")
> Fixes: ceba1832b1b2 ("calipso: Set the calipso socket label to match the secattr.")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
>  net/ipv4/cipso_ipv4.c        | 6 ++++--
>  net/ipv6/calipso.c           | 3 ++-
>  net/netlabel/netlabel_kapi.c | 6 ++++++
>  3 files changed, 12 insertions(+), 3 deletions(-)

Seems reasonable to me, thanks Paolo.

Acked-by: Paul Moore <paul@...l-moore.com>

-- 
paul moore
www.paul-moore.com