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Re: [Xen-devel] [RFC PATCH 0/3] basic KASAN support for Xen PV domains
- To: Boris Ostrovsky <BORIS.OSTROVSKY@xxxxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Fri, 20 Dec 2019 10:26:09 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxx, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
- Delivery-date: Fri, 20 Dec 2019 10:26:31 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 17/12/2019 18:06, Boris Ostrovsky wrote:
>
>
>> On Dec 17, 2019, at 9:08 AM, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx> wrote:
>>
>> This series allows to boot and run Xen PV kernels (Dom0 and DomU) with
>> CONFIG_KASAN=y. It has been used internally for some time now with good
>> results for finding memory corruption issues in Dom0 kernel.
>>
>> Only Outline instrumentation is supported at the moment.
>>
>> Patch 1 is of RFC quality
>> Patches 2-3 are independent and quite self-contained.
>
>
> Don’t you need to initialize kasan before, for example, calling
> kasan_alloc_pages() in patch 2?
Patch 1 is enough to correctly initialise PV Kasan. But without patch 2, lots
of false positive out-of-bounds accesses are reported once a guest starts using
PV I/O devices.
--
Thanks,
Sergey
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