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Date: Mon, 24 Aug 2015 19:18:33 +0300
Message-ID: <CAPAsAGwwEpKVVk4bxKhrGSQ-YBi74CrjTsn8Xmy4YpRB8c84VA@mail.gmail.com>
Subject: Re: [PATCH v2 5/5] arm64: add KASan support
From: Andrey Ryabinin <ryabinin.a.a@gmail.com>
To: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Catalin Marinas <Catalin.Marinas@arm.com>,
        Will Deacon <Will.Deacon@arm.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        David Keitel <dkeitel@codeaurora.org>,
        Alexander Potapenko <glider@google.com>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dmitry Vyukov <dvyukov@google.com>
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2015-08-24 19:16 GMT+03:00 Vladimir Murzin <vladimir.murzin@arm.com>:
> On 24/08/15 17:00, Andrey Ryabinin wrote:
>> 2015-08-24 18:44 GMT+03:00 Vladimir Murzin <vladimir.murzin@arm.com>:
>>>
>>> Another option would be having "sparse" shadow memory based on page
>>> extension. I did play with that some time ago based on ideas from
>>> original v1 KASan support for x86/arm - it is how 614be38 "irqchip:
>>> gic-v3: Fix out of bounds access to cpu_logical_map" was caught.
>>> It doesn't require any VA reservations, only some contiguous memory for
>>> the page_ext itself, which serves as indirection level for the 0-order
>>> shadow pages.
>>
>> We won't be able to use inline instrumentation (I could live with that),
>> and most importantly, we won't be able to use stack instrumentation.
>> GCC needs to know shadow address for inline and/or stack instrumentation
>> to generate correct code.
>
> It's definitely a trade-off ;)
>
> Just for my understanding does that stack instrumentation is controlled
> via -asan-stack?
>

Yup.
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