From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
Subject: Re: [PATCH v3] kasan: add memory corruption identification for
 software tag-based mode
Date: Fri, 26 Jul 2019 15:52:10 +0300
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To: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Dmitry Vyukov <dvyukov@google.com>, Alexander Potapenko <glider@google.com>, Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Matthias Brugger <matthias.bgg@gmail.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Arnd Bergmann <arnd@arndb.de>, Vasily Gorbik <gor@linux.ibm.com>, Andrey Konovalov <andreyknvl@google.com>, "Jason A . Donenfeld" <Jason@zx2c4.com>, Miles Chen <miles.chen@mediatek.com>, kasan-dev <kasan-dev@googlegroups.com>, LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, linux-mediatek@lists.infradead.org, wsd_upstream <wsd_upstream@mediatek.com>
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On 7/26/19 3:28 PM, Walter Wu wrote:
> On Fri, 2019-07-26 at 15:00 +0300, Andrey Ryabinin wrote:
>>
>
>>>
>>>
>>> I remember that there are already the lists which you concern. Maybe we
>>> can try to solve those problems one by one.
>>>
>>> 1. deadlock issue? cause by kmalloc() after kfree()?
>>
>> smp_call_on_cpu()
> 
>>> 2. decrease allocation fail, to modify GFP_NOWAIT flag to GFP_KERNEL?
>>
>> No, this is not gonna work. Ideally we shouldn't have any allocations there.
>> It's not reliable and it hurts performance.
>>
> I dont know this meaning, we need create a qobject and put into
> quarantine, so may need to call kmem_cache_alloc(), would you agree this
> action?
> 

How is this any different from what you have now?