linux-kernel - Re: [PATCH 5.4 00/17] Backport oops

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Date:   Thu, 2 Feb 2023 12:47:07 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     stable@...r.kernel.org,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        Kees Cook <keescook@...omium.org>,
        SeongJae Park <sj@...nel.org>,
        Seth Jenkins <sethjenkins@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5.4 00/17] Backport oops_limit to 5.4

On Thu, Feb 02, 2023 at 12:16:52PM -0500, Sasha Levin wrote:
>On Wed, Feb 01, 2023 at 08:42:38PM -0800, Eric Biggers wrote:
>>This series backports the patchset
>>"exit: Put an upper limit on how often we can oops"
>>(https://lore.kernel.org/linux-mm/20221117233838.give.484-kees@kernel.org/T/#u)
>>to 5.4, as recommended at
>>https://googleprojectzero.blogspot.com/2023/01/exploiting-null-dereferences-in-linux.html
>>This follows the backports to 5.10 and 5.15 which already released.
>>
>>This required backporting various prerequisite patches.
>>
>>I've tested that oops_limit and warn_limit work correctly on x86_64.
>
>Queued up all 3 backports, thanks!

... and proceeded to drop the 4.19 and 4.14 backports which fail to
build:

mm/kasan/report.c: In function 'kasan_end_report':
mm/kasan/report.c:175:16: error: 'KASAN_BIT_MULTI_SHOT' undeclared (first use in this function)
   175 |  if (!test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags))

-- 
Thanks,
Sasha