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

[Paul Moore]

On Tue, Dec 31, 2019 at 2:51 PM Richard Guy Briggs <rgb at redhat.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 at redhat.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