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From:   ebiederm@xmission.com (Eric W. Biederman)
To:     Casey Schaufler <casey@schaufler-ca.com>
Cc:     Linux Containers <containers@lists.linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
        khlebnikov@yandex-team.ru, prakash.sangappa@oracle.com,
        luto@kernel.org, akpm@linux-foundation.org, oleg@redhat.com,
        serge.hallyn@ubuntu.com, esyr@redhat.com, jannh@google.com,
        linux-security-module@vger.kernel.org,
        Pavel Emelyanov <xemul@openvz.org>,
        Nagarathnam Muthusamy <nagarathnam.muthusamy@oracle.com>
References: <87vadmobdw.fsf_-_@xmission.com>
        <20180323191614.32489-3-ebiederm@xmission.com>
        <bb73b0ea-bcda-a996-8f14-48d9dd1b0940@schaufler-ca.com>
Date:   Sat, 24 Mar 2018 00:37:19 -0500
In-Reply-To: <bb73b0ea-bcda-a996-8f14-48d9dd1b0940@schaufler-ca.com> (Casey
        Schaufler's message of "Fri, 23 Mar 2018 14:55:09 -0700")
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Subject: Re: [REVIEW][PATCH 03/11] msg/security: Pass kern_ipc_perm not msg_queue into the msg_queue security hooks
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Casey Schaufler <casey@schaufler-ca.com> writes:

> On 3/23/2018 12:16 PM, Eric W. Biederman wrote:
>> All of the implementations of security hooks that take msg_queue only
>> access q_perm the struct kern_ipc_perm member.  This means the
>> dependencies of the msg_queue security hooks can be simplified by
>> passing the kern_ipc_perm member of msg_queue.
>>
>> Making this change will allow struct msg_queue to become private to
>> ipc/msg.c.
>>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>>  include/linux/lsm_hooks.h  | 12 ++++++------
>>  include/linux/security.h   | 25 ++++++++++++-------------
>>  ipc/msg.c                  | 18 ++++++++----------
>>  security/security.c        | 12 ++++++------
>>  security/selinux/hooks.c   | 36 ++++++++++++++++++------------------
>>  security/smack/smack_lsm.c | 24 ++++++++++++------------
>
> Can I reference the comments I made in PATCH 01 of this set
> regarding the Smack changes? The problem in all of your changes
> is the same. You aren't preserving the naming conventions, and
> you've left in some code that is just silly.

Being silly like that is actually important to make a sweeping patch
like that boring and trivial to show that it is correct.  Anything
that is not a rule based transformation is much more likely to hide
a bug.  So for the push down of the type change I think it was the right
way to go.

That said I am happy to add a clean up patch that makes the obvious
cleanups and simplifications to smack_lsm.c.

Eric