linux-kernel - Re: [PATCH 5/5] kasan: Extend KASAN mode kernel parameter

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Message-ID: <f789ede2-3fa2-8a50-3d82-8b2dc2f12386@arm.com>
Date:   Mon, 20 Sep 2021 09:46:21 +0200
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Marco Elver <elver@...gle.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 5/5] kasan: Extend KASAN mode kernel parameter

Hi Marco,

On 9/16/21 12:43 PM, Marco Elver wrote:
>> +       case KASAN_ARG_MODE_ASYMM:
>> +               /* Asymm mode enabled. */
>> +               kasan_flag_asymm = true;
>> +               break;
>>         }
>>
>>         switch (kasan_arg_stacktrace) {
>> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
>> index 3639e7c8bb98..a8be62058d32 100644
>> --- a/mm/kasan/kasan.h
>> +++ b/mm/kasan/kasan.h
> Shouldn't kasan.h also define kasan_asymm_mode_enabled() similar to
> kasan_async_mode_enabled()?
> 
> And based on that, also use it where kasan_async_mode_enabled() is
> used in tests to ensure the tests do not fail. Otherwise, there is no
> purpose for kasan_flag_asymm.
>

I was not planning to have the tests shipped as part of this series, they will
come in a future one.

For what concerns kasan_flag_asymm, I agree with you it is meaningful only if
the tests are implemented hence I will remove it in v2.

Thanks for pointing this out.

> Thanks,
> -- Marco
> 

-- 
Regards,
Vincenzo