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[185.231.240.75]) by mx.google.com with ESMTPS id e16si45307995ljh.141.2019.07.26.05.52.13 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 Jul 2019 05:52:13 -0700 (PDT) Received-SPF: pass (google.com: domain of aryabinin@virtuozzo.com designates 185.231.240.75 as permitted sender) client-ip=185.231.240.75; Authentication-Results: mx.google.com; spf=pass (google.com: domain of aryabinin@virtuozzo.com designates 185.231.240.75 as permitted sender) smtp.mailfrom=aryabinin@virtuozzo.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=virtuozzo.com Received: from [172.16.25.12] by relay.sw.ru with esmtp (Exim 4.92) (envelope-from ) id 1hqzhc-0007Xf-H3; Fri, 26 Jul 2019 15:52:04 +0300 Subject: Re: [PATCH v3] kasan: add memory corruption identification for software tag-based mode To: Walter Wu Cc: Dmitry Vyukov , Alexander Potapenko , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Matthias Brugger , Martin Schwidefsky , Arnd Bergmann , Vasily Gorbik , Andrey Konovalov , "Jason A . Donenfeld" , Miles Chen , kasan-dev , LKML , Linux-MM , Linux ARM , linux-mediatek@lists.infradead.org, wsd_upstream References: <20190613081357.1360-1-walter-zh.wu@mediatek.com> <1560447999.15814.15.camel@mtksdccf07> <1560479520.15814.34.camel@mtksdccf07> <1560744017.15814.49.camel@mtksdccf07> <1560774735.15814.54.camel@mtksdccf07> <1561974995.18866.1.camel@mtksdccf07> <1562640832.9077.32.camel@mtksdccf07> <1562839579.5846.12.camel@mtksdccf07> <37897fb7-88c1-859a-dfcc-0a5e89a642e0@virtuozzo.com> <1563160001.4793.4.camel@mtksdccf07> <9ab1871a-2605-ab34-3fd3-4b44a0e17ab7@virtuozzo.com> <1563789162.31223.3.camel@mtksdccf07> <1564144097.515.3.camel@mtksdccf07> From: Andrey Ryabinin Message-ID: <71df2bd5-7bc8-2c82-ee31-3f68c3b6296d@virtuozzo.com> Date: Fri, 26 Jul 2019 15:52:10 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1564144097.515.3.camel@mtksdccf07> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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?