netdev - Re: [PATCH net-next v5] rtnetlink: add new RTM

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Date:	Tue, 19 Apr 2016 15:55:33 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	nicolas.dichtel@...nd.com
Cc:	Roopa Prabhu <roopa@...ulusnetworks.com>, netdev@...r.kernel.org,
	jhs@...atatu.com, davem@...emloft.net, tgraf@...g.ch,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH net-next v5] rtnetlink: add new RTM_GETSTATS message to
 dump link stats

On Tue, Apr 19, 2016 at 4:26 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
> + selinux maintainers
>
> Le 18/04/2016 23:10, Roopa Prabhu a écrit :
> [snip]
>>
>> diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c
>> index 8495b93..1714633 100644
>> --- a/security/selinux/nlmsgtab.c
>> +++ b/security/selinux/nlmsgtab.c
>> @@ -76,6 +76,8 @@ static struct nlmsg_perm nlmsg_route_perms[] =
>>         { RTM_NEWNSID,          NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
>>         { RTM_DELNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
>>         { RTM_GETNSID,          NETLINK_ROUTE_SOCKET__NLMSG_READ  },
>> +       { RTM_NEWSTATS,         NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
>
> I would say it's NETLINK_ROUTE_SOCKET__NLMSG_READ, not WRITE. This command
> is only sent by the kernel, not by the userland.

>From what I could tell from the patch description, it looks like
RTM_NEWSTATS only dumps stats to userspace and doesn't alter the state
of the kernel, is that correct?  If so, then yes, NLMSG__READ is the
right SELinux permission.  However, if RTM_NEWSTATS does alter the
state/configuration of the kernel then we should use NLMSG__WRITE.

-- 
paul moore
www.paul-moore.com