[PATCH 1/1] audit: CONFIG_CHANGE don't log internal bookkeeping as an event

[Paul Moore]

On Sun, Jan 5, 2020 at 10:22 AM Steve Grubb <sgrubb at redhat.com> wrote:
> Common Criteria calls out for any action that modifies the audit trail to
> be recorded. That usually is interpreted to mean insertion or removal of
> rules. It is not required to log modification of the inode information
> since the watch is still in effect. Additionally, if the rule is a never
> rule and the underlying file is one they do not want events for, they
> get an event for this bookkeeping update against their wishes.
>
> Since no device/inode info is logged at insertion and no device/inode
> information is logged on update, there is nothing meaningful being
> communicated to the admin by the CONFIG_CHANGE updated_rules event. One
> can assume that the rule was not "modified" because it is still watching
> the intended target. If the device or inode cannot be resolved, then
> audit_panic is called which is sufficient.
>
> I think the correct resolution is to drop logging config_update events
> since the watch is still in effect but just on another unknown inode.

Either this patch is the correct resolution or it isn't, the
description should state that clearly.  If you are unsure we can
discuss it, but it sounds like you are certain that this record isn't
needed here, yes?

> Signed-off-by: Steve Grubb <sgrubb at redhat.com>
> ---
>  kernel/audit_watch.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
> index 4508d5e0cf69..8a8fd732ff6d 100644
> --- a/kernel/audit_watch.c
> +++ b/kernel/audit_watch.c
> @@ -302,8 +302,6 @@ static void audit_update_watch(struct audit_parent *parent,
>                         if (oentry->rule.exe)
>                                 audit_remove_mark(oentry->rule.exe);
>
> -                       audit_watch_log_rule_change(r, owatch, "updated_rules");
> -
>                         call_rcu(&oentry->rcu, audit_free_rule_rcu);
>                 }
>

-- 
paul moore
www.paul-moore.com