linux-kernel - Re: [PATCH v2] ARM: kasan: Only map modules if CONFIG_KASAN

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Date:   Mon, 5 Sep 2022 17:28:35 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...ia.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     kasan-dev@...glegroups.com,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: kasan: Only map modules if CONFIG_KASAN_VMALLOC=n

Hello Linus,

On 05/09/2022 15:38, Linus Walleij wrote:
>> In case CONFIG_KASAN_VMALLOC=y kasan_populate_vmalloc() allocates the
>> shadow pages dynamically. But even worse is that kasan_release_vmalloc()
>> releases them, which is not compatible with create_mapping() of
>> MODULES_VADDR..MODULES_END range:
>>
>> BUG: Bad page state in process kworker/9:1  pfn:2068b

[...]

>>
>> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
> Thanks Alexander, will you submit this to Russell's patch tracker please?

done!

https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=9242/1

Thank you for the quick review!

-- 
Best regards,
Alexander Sverdlin.