linux-kernel - Re: [PATCH 0/2] Begin auditing SECCOMP_RET

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Date:   Tue, 3 Jan 2017 13:21:09 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Tyler Hicks <tyhicks@...onical.com>,
        Eric Paris <eparis@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, linux-audit@...hat.com,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Begin auditing SECCOMP_RET_ERRNO return actions

On Tue, Jan 3, 2017 at 1:13 PM, Paul Moore <paul@...l-moore.com> wrote:
> On Tue, Jan 3, 2017 at 4:03 PM, Kees Cook <keescook@...omium.org> wrote:
>> On Tue, Jan 3, 2017 at 12:54 PM, Paul Moore <paul@...l-moore.com> wrote:
>>> On Tue, Jan 3, 2017 at 3:44 PM, Kees Cook <keescook@...omium.org> wrote:
>>>> I still wonder, though, isn't there a way to use auditctl to get all
>>>> the seccomp messages you need?
>>>
>>> Not all of the seccomp actions are currently logged, that's one of the
>>> problems (and the biggest at the moment).
>>
>> Well... sort of. It all gets passed around, but the logic isn't very
>> obvious (or at least I always have to go look it up).
>
> Last time I checked SECCOMP_RET_ALLOW wasn't logged (as well as at
> least one other action, but I can't remember which off the top of my
> head)?

Sure, but if you're using audit, you don't need RET_ALLOW to be logged
because you'll get a full syscall log entry. Logging RET_ALLOW is
redundant and provides no new information, it seems to me.

-Kees

-- 
Kees Cook
Nexus Security