linux-kernel - Re: unused code in net/netfilter/ipset/ip_set_bitmap

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Message-ID: <alpine.DEB.2.10.1602291326090.2600@hadrien>
Date:	Mon, 29 Feb 2016 13:27:51 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
cc:	Julia Lawall <julia.lawall@...6.fr>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>
Subject: Re: unused code in net/netfilter/ipset/ip_set_bitmap_ipmac.c



On Mon, 29 Feb 2016, Jozsef Kadlecsik wrote:

> Hi,
>
> On Mon, 29 Feb 2016, Julia Lawall wrote:
>
> > The file net/netfilter/ipset/ip_set_bitmap_ipmac.c seems to contain a lot
> > of static functions that are not used in the file:
> >
> > bitmap_ipmac_add_timeout
> > bitmap_ipmac_do_add
> > bitmap_ipmac_do_del
> > bitmap_ipmac_do_head
> > bitmap_ipmac_do_list
> > bitmap_ipmac_do_test
> > bitmap_ipmac_gc_test
> > bitmap_ipmac_is_filled
> > bitmap_ipmac_kadt
> > bitmap_ipmac_same_set
> > bitmap_ipmac_uadt
> >
> > Have I overooked something?
>
> Yes: the file includes ip_set_bitmap_gen.h in which all those functions
> are used.

OK, thanks.  I saw the incude, but I didn't sufficiently appreciate the
#defines at the beginning.  Thanks.

> > I was looking at this code, with Daniel Borkmann, because there seems to
> > be a bug in the function bitmap_ipmac_uadt:
> >
> > 	if (tb[IPSET_ATTR_ETHER]) {
> >                 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
> >                 e.add_mac = 1;
> >         }
> >
> > Later in the same file, there is:
> >
> > static struct ip_set_type bitmap_ipmac_type = {
> > 	...
> >         .adt_policy     = {
> > 		...
> > 		[IPSET_ATTR_ETHER]      = { .type = NLA_BINARY,
> >                                             .len  = ETH_ALEN },
> > 		...},
> > 	...
> > };
> >
> > The type NLA_BINARY indicates that the length is a maximum possible
> > length, and thus a check of the actual length is needed before the memcpy.
>
> You are right here (and the similar spotting in ip_set_hash_mac.c) - I'll
> prepare a patch and submit it.

Great.  Thanks.

julia

>
> Best regards,
> Jozsef
> -
> E-mail  : kadlec@...ckhole.kfki.hu, kadlecsik.jozsef@...ner.mta.hu
> PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt
> Address : Wigner Research Centre for Physics, Hungarian Academy of Sciences
>           H-1525 Budapest 114, POB. 49, Hungary
>