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

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Message-ID: <f185bb42-b29c-977e-312e-3349eea15383@linuxfoundation.org>
Date:   Tue, 20 Dec 2022 09:55:26 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Jeff Xu <jeffxu@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>, Peter Xu <peterx@...hat.com>,
        jeffxu@...omium.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>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v6 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC

On 12/16/22 16:40, Jeff Xu wrote:
> On Fri, Dec 16, 2022 at 2:06 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>>
>> On Fri, 16 Dec 2022 13:46:58 -0800 Jeff Xu <jeffxu@...gle.com> wrote:
>>
>>> On Fri, Dec 16, 2022 at 12:35 PM Kees Cook <keescook@...omium.org> wrote:
>>>>
>>>> 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.
>>>>
>>> Agreed.  Let's go with per boot.
>>>
>>> Hi Andrew, what is your preference ? I can send a patch  or you
>>> directly fix it in mm-unstable ?
>>
>> Like this?
>>
> Yes. Thanks!
> 

Sorry jumping into this discussion a bit late. Is it possible to provide
a way to enable full logging as a debug option to tag more processes?

thanks,
-- Shuah