linux-kernel - Please add oops

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Date:   Thu, 19 Jan 2023 16:26:55 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     SeongJae Park <sj@...nel.org>,
        Seth Jenkins <sethjenkins@...gle.com>,
        Jann Horn <jannh@...gle.com>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Please add oops_limit to -stable

Hi,

I'd like to ask that the oops_limit series get included in -stable
releases. It's a recommended defense developed while writing this
report:
https://googleprojectzero.blogspot.com/2023/01/exploiting-null-dereferences-in-linux.html

I've had a few people ask about having it in -stable, for example:
https://lore.kernel.org/lkml/20230119201023.4003-1-sj@kernel.org

This is the series:

9360d035a579 panic: Separate sysctl logic from CONFIG_SMP
d4ccd54d28d3 exit: Put an upper limit on how often we can oops
9db89b411170 exit: Expose "oops_count" to sysfs
de92f65719cd exit: Allow oops_limit to be disabled
79cc1ba7badf panic: Consolidate open-coded panic_on_warn checks
9fc9e278a5c0 panic: Introduce warn_limit
8b05aa263361 panic: Expose "warn_count" to sysfs
00dd027f721e docs: Fix path paste-o for /sys/kernel/warn_count
7535b832c639 exit: Use READ_ONCE() for all oops/warn limit reads

For v6.1.x they apply cleanly and behave as expected.

I'm hoping someone can step up and do backports for v5.15.x and earlier,
as there appear to be a number of conflicts and I'm swamped with other
stuff to do. :P

Thanks!

-Kees

-- 
Kees Cook