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

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Message-ID: <3e6a5797-4690-ea54-c14b-75d6ca58e744@arm.com>
Date:   Mon, 4 Oct 2021 17:45:41 +0200
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Andrey Konovalov <andreyknvl@...il.com>
Cc:     Marco Elver <elver@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <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>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 5/5] kasan: Extend KASAN mode kernel parameter

Hi Andrey,

On 10/3/21 7:16 PM, Andrey Konovalov wrote:
> Hi Vincenzo,
> 
> Up till now, the code assumes that not having the async mode enabled
> means that the sync mode is enabled. There are two callers to
> kasan_async_mode_enabled(): lib/test_kasan.c and mm/kasan/report.c.
> Assuming tests support will be added later, at least the second one
> should be adjusted.
> 
> Maybe we should rename kasan_async_mode_enabled() to
> kasan_async_fault_possible(), make it return true for both async and
> asymm modes, and use that in mm/kasan/report.c. And also add
> kasan_sync_fault_possible() returning true for sync and asymm, and use
> that in lib/test_kasan.c. (However, it seems that the tests don't work
> with async faults right now.)
> 

It is ok by me, I will add the changes you are mentioning in v2.

> Thanks!

-- 
Regards,
Vincenzo