linux-kernel - Re: [PATCH RFC] netlabel: remove unused param from audit_log

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Date:   Thu, 27 Aug 2020 13:00:58 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Alex Dewar <alex.dewar90@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] netlabel: remove unused param from audit_log_format()

On Thu, Aug 27, 2020 at 12:39 PM Alex Dewar <alex.dewar90@...il.com> wrote:
>
> Commit d3b990b7f327 ("netlabel: fix problems with mapping removal")
> added a check to return an error if ret_val != 0, before ret_val is
> later used in a log message. Now it will unconditionally print "...
> res=0". So don't print res anymore.
>
> Addresses-Coverity: ("Dead code")
> Fixes: d3b990b7f327 ("netlabel: fix problems with mapping removal")
> Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
> ---
>
> I wasn't sure whether it was intended that something other than ret_val
> be printed in the log, so that's why I'm sending this as an RFC.

It's intentional for a couple of reasons:

* The people who care about audit logs like to see success/fail (e.g.
"res=X") for audit events/records, so printing this out gives them the
warm fuzzies.

* For a lot of awful reasons that I won't bore you with, we really
don't want to add/remove fields in the middle of an audit record so we
pretty much need to keep the "res=0" there even if it seems a bit
redundant.

So NACK from me, but thanks for paying attention just the same :)

>  net/netlabel/netlabel_domainhash.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/net/netlabel/netlabel_domainhash.c b/net/netlabel/netlabel_domainhash.c
> index f73a8382c275..526762b2f3a9 100644
> --- a/net/netlabel/netlabel_domainhash.c
> +++ b/net/netlabel/netlabel_domainhash.c
> @@ -612,9 +612,8 @@ int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
>         audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
>         if (audit_buf != NULL) {
>                 audit_log_format(audit_buf,
> -                                " nlbl_domain=%s res=%u",
> -                                entry->domain ? entry->domain : "(default)",
> -                                ret_val == 0 ? 1 : 0);
> +                                " nlbl_domain=%s",
> +                                entry->domain ? entry->domain : "(default)");
>                 audit_log_end(audit_buf);
>         }
>

-- 
paul moore
www.paul-moore.com