Re: [PATCH 4.0 219/220] netfilter: x_tables: fix cgroup matching on non-full sks

[Stefan Lippers-Hollmann]

Hi

On 2015-05-02, Greg Kroah-Hartman wrote:
> 4.0-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> 
> commit afb7718016fcb0370ac29a83b2839c78b76c2960 upstream.
> 
> While originally only being intended for outgoing traffic, commit
> a00e76349f35 ("netfilter: x_tables: allow to use cgroup match for
> LOCAL_IN nf hooks") enabled xt_cgroups for the NF_INET_LOCAL_IN hook
> as well, in order to allow for nfacct accounting.
> 
> Besides being currently limited to early demuxes only, commit
> a00e76349f35 forgot to add a check if we deal with full sockets,
> i.e. in this case not with time wait sockets. TCP time wait sockets
> do not have the same memory layout as full sockets, a lower memory
> footprint and consequently also don't have a sk_classid member;
> probing for sk_classid member there could potentially lead to a
> crash.

This introduces the same build failure into queue-4.0, as previously 
reported by Thomas Backlund for queue-3.19 in 

	http://lkml.kernel.org/r/<554545E5.8020606@xxxxxxxxxx>

/tmp/buildd/linux-aptosid-4.0/net/netfilter/xt_cgroup.c: In function 'cgroup_mt':
/tmp/buildd/linux-aptosid-4.0/net/netfilter/xt_cgroup.c:42:2: error: implicit declaration of function 'sk_fullsock' [-Werror=implicit-function-declaration]
  if (skb->sk == NULL || !sk_fullsock(skb->sk))
  ^
cc1: some warnings being treated as errors
/tmp/buildd/linux-aptosid-4.0/scripts/Makefile.build:264: recipe for target 'net/netfilter/xt_cgroup.o' failed
make[7]: *** [net/netfilter/xt_cgroup.o] Error 1

Regards
	Stefan Lippers-Hollmann
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