linux-kernel - Re: [PATCH v6 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD

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Message-ID: <202212161233.85C9783FB@keescook>
Date:   Fri, 16 Dec 2022 12:35:10 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Jeff Xu <jeffxu@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, jeffxu@...omium.org,
        skhan@...uxfoundation.org, dmitry.torokhov@...il.com,
        dverkamp@...omium.org, hughd@...gle.com, jorgelo@...omium.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, jannh@...gle.com,
        linux-hardening@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v6 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC

On Fri, Dec 16, 2022 at 10:11:44AM -0800, Jeff Xu wrote:
> Once per boot seems too little, it would be nice if we can list all processes.
> I agree ratelimited might be too much.
> There is a feature gap here for logging.
> 
> Kees, what do you think ?

I agree once per boot is kind of frustrating "I fixed the one warning,
oh, now it's coming from a different process". But ratelimit is, in
retrospect, still too often.

Let's go with per boot -- this should be noisy "enough" to get the
changes in API into the callers without being too much of a hassle.

-- 
Kees Cook