linux-hardening - Re: [PATCH v3 2/6] exit: Put an upper limit on how often we can oops

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Date:   Tue, 24 Jan 2023 15:09:51 -0800
From:   Kees Cook <kees@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>,
        Kees Cook <keescook@...omium.org>
CC:     Seth Jenkins <sethjenkins@...gle.com>,
        SeongJae Park <sj@...nel.org>, Jann Horn <jannh@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        tangmeng <tangmeng@...ontech.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        David Gow <davidgow@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Huang Ying <ying.huang@...el.com>,
        Anton Vorontsov <anton@...msg.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 2/6] exit: Put an upper limit on how often we can oops

On January 24, 2023 11:38:05 AM PST, Eric Biggers <ebiggers@...nel.org> wrote:
>On Tue, Jan 24, 2023 at 10:54:57AM -0800, Eric Biggers wrote:
>> On Thu, Jan 19, 2023 at 04:28:42PM -0800, Kees Cook wrote:
>> > On Thu, Jan 19, 2023 at 03:19:21PM -0500, Seth Jenkins wrote:
>> > > > Do you have a plan to backport this into upstream LTS kernels?
>> > > 
>> > > As I understand, the answer is "hopefully yes" with the big
>> > > presumption that all stakeholders are on board for the change. There
>> > > is *definitely* a plan to *submit* backports to the stable trees, but
>> > > ofc it will require some approvals.
>> > 
>> > I've asked for at least v6.1.x (it's a clean cherry-pick). Earlier
>> > kernels will need some non-trivial backporting. Is there anyone that
>> > would be interested in stepping up to do that?
>> > 
>> > https://lore.kernel.org/lkml/202301191532.AEEC765@keescook
>> > 
>> 
>> I've sent out a backport to 5.15:
>> https://lore.kernel.org/stable/20230124185110.143857-1-ebiggers@kernel.org/T/#t
>
>Also 5.10, which wasn't too hard after doing 5.15:
>https://lore.kernel.org/stable/20230124193004.206841-1-ebiggers@kernel.org/T/#t

Oh excellent! Thank you very much!

-Kees



-- 
Kees Cook