linux-kernel - Re: [PATCH ghak90 V8 15/16] audit: check contid count per netns and add config param limit

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Date:   Wed, 22 Jan 2020 16:29:29 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
        Linux-Audit Mailing List <linux-audit@...hat.com>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        sgrubb@...hat.com, omosnace@...hat.com, dhowells@...hat.com,
        simo@...hat.com, Eric Paris <eparis@...isplace.org>,
        Serge Hallyn <serge@...lyn.com>, ebiederm@...ssion.com,
        nhorman@...driver.com, Dan Walsh <dwalsh@...hat.com>,
        mpatel@...hat.com
Subject: Re: [PATCH ghak90 V8 15/16] audit: check contid count per netns and
 add config param limit

On Tue, Dec 31, 2019 at 2:51 PM Richard Guy Briggs <rgb@...hat.com> wrote:
>
> Clamp the number of audit container identifiers associated with a
> network namespace to limit the netlink and disk bandwidth used and to
> prevent losing information from record text size overflow in the contid
> field.
>
> Add a configuration parameter AUDIT_STATUS_CONTID_NETNS_LIMIT (0x100)
> to set the audit container identifier netns limit.  This is used to
> prevent overflow of the contid field in CONTAINER_OP and CONTAINER_ID
> messages, losing information, and to limit bandwidth used by these
> messages.
>
> This value must be balanced with the audit container identifier nesting
> depth limit to multiply out to no more than 400.  This is determined by
> the total audit message length less message overhead divided by the
> length of the text representation of an audit container identifier.
>
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  include/linux/audit.h      | 16 +++++++----
>  include/linux/nsproxy.h    |  2 +-
>  include/uapi/linux/audit.h |  2 ++
>  kernel/audit.c             | 68 ++++++++++++++++++++++++++++++++++++++--------
>  kernel/audit.h             |  7 +++++
>  kernel/fork.c              | 10 +++++--
>  kernel/nsproxy.c           | 27 +++++++++++++++---
>  7 files changed, 107 insertions(+), 25 deletions(-)

Similar to my comments in patch 14, let's defer this to a later time
if we need to do this at all.

--
paul moore
www.paul-moore.com