linux-kernel - Re: Should audit_seccomp check audit

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Message-ID: <CAGXu5jK-EhKR=bTvA3CMQYf0916iyKiE0oQt7b2VByo_qr=oDw@mail.gmail.com>
Date:	Fri, 23 Oct 2015 14:22:36 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-audit@...hat.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Richard Guy Briggs <rgb@...hat.com>
Subject: Re: Should audit_seccomp check audit_enabled?

On Fri, Oct 23, 2015 at 2:07 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Oct 23, 2015 10:01 AM, "Kees Cook" <keescook@...omium.org> wrote:
>>
>> On Fri, Oct 23, 2015 at 9:19 AM, Andy Lutomirski <luto@...capital.net> wrote:
>> > I would argue that, if auditing is off, audit_seccomp shouldn't do
>> > anything.  After all, unlike e.g. selinux, seccomp is not a systemwide
>> > policy, and seccomp signals might be ordinary behavior that's internal
>> > to the seccomp-using application.  IOW, for people with audit compiled
>> > in and subscribed by journald but switched off, I think that the
>> > records shouldn't be emitted.
>> >
>> > If you agree, I can send the two-line patch.
>>
>> I think signr==0 states (which I would identify as "intended
>> behavior") don't need to be reported under any situation, but audit
>> folks wanted to keep it around.
>
> Even if there is a nonzero signr, it could just be a program opting to
> trap and emulate one of its own syscalls.

At present, that is a rare situation. Programs tend to be ptrace
managed externally. Is there anything catching SIGSYS itself?

-Kees

-- 
Kees Cook
Chrome OS Security
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