linux-kernel - Re: [PATCH v6 3/4] kunit: Taint the kernel when KUnit tests are run

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Date:   Fri, 8 Jul 2022 15:24:41 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     David Gow <davidgow@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        "Guilherme G . Piccoli" <gpiccoli@...lia.com>,
        Sebastian Reichel <sre@...nel.org>,
        John Ogness <john.ogness@...utronix.de>,
        Joe Fradley <joefradley@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Aaron Tomlin <atomlin@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jonathan Corbet <corbet@....net>, linux-kbuild@...r.kernel.org,
        Greg KH <gregkh@...uxfoundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v6 3/4] kunit: Taint the kernel when KUnit tests are run

On 7/8/22 3:22 PM, Shuah Khan wrote:
> On 7/8/22 3:00 PM, Daniel Latypov wrote:
>> On Fri, Jul 8, 2022 at 1:22 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>>
>>> On 7/7/22 10:48 PM, David Gow wrote:
>>>> Make KUnit trigger the new TAINT_TEST taint when any KUnit test is run.
>>>> Due to KUnit tests not being intended to run on production systems, and
>>>> potentially causing problems (or security issues like leaking kernel
>>>> addresses), the kernel's state should not be considered safe for
>>>> production use after KUnit tests are run.
>>>>
>>>> This both marks KUnit modules as test modules using MODULE_INFO() and
>>>> manually taints the kernel when tests are run (which catches builtin
>>>> tests).
>>>>
>>>> Acked-by: Luis Chamberlain <mcgrof@...nel.org>
>>>> Tested-by: Daniel Latypov <dlatypov@...gle.com>
>>>> Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
>>>> Signed-off-by: David Gow <davidgow@...gle.com>
>>>> ---
>>>>
>>>> No changes since v5:
>>>> https://lore.kernel.org/linux-kselftest/20220702040959.3232874-3-davidgow@google.com/
>>>>
>>>> No changes since v4:
>>>> https://lore.kernel.org/linux-kselftest/20220701084744.3002019-3-davidgow@google.com/
>>>>
>>>
>>> David, Brendan, Andrew,
>>>
>>> Just confirming the status of these patches. I applied v4 1/3 and v4 3/4
>>> to linux-kselftest kunit for 5.20-rc1.
>>> I am seeing v5 and v6 now. Andrew applied v5 looks like. Would you like
>>> me to drop the two I applied? Do we have to refresh with v6?
>>
>> Just noting here that there'll be a merge conflict between this patch
>> (3/4) and some other patches lined up to go through the kunit tree:
>> https://patchwork.kernel.org/project/linux-kselftest/patch/20220625050838.1618469-2-davidgow@google.com/
>>
>> Not sure how we want to handle that.
>>
> 
> I can go drop the two patches and have Andrew carry the series through
> mm tree.
> 

Sorry spoke too soon. Yes there are others that might have conflicts as
Daniel pointed out:

https://patchwork.kernel.org/project/linux-kselftest/patch/20220625050838.1618469-2-davidgow@google.com/

thanks,
-- Shuah