Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: None (esa2.hc3370-68.iphmx.com: no sender
  authenticity information available from domain of
  sergey.dyasli@citrix.com) identity=pra;
  client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com;
  envelope-from="sergey.dyasli@citrix.com";
  x-sender="sergey.dyasli@citrix.com";
  x-conformance=sidf_compatible
Received-SPF: Pass (esa2.hc3370-68.iphmx.com: domain of
  sergey.dyasli@citrix.com designates 162.221.158.21 as
  permitted sender) identity=mailfrom;
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  envelope-from="sergey.dyasli@citrix.com";
  x-sender="sergey.dyasli@citrix.com";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133
  ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4
  ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88
  ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83
  ip4:168.245.78.127 ~all"
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  envelope-from="sergey.dyasli@citrix.com";
  x-sender="postmaster@mail.citrix.com";
  x-conformance=sidf_compatible
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 rs4=
Subject: Re: [RFC PATCH 0/3] basic KASAN support for Xen PV domains
To:     Boris Ostrovsky <BORIS.OSTROVSKY@ORACLE.COM>
CC:     <xen-devel@lists.xen.org>, <kasan-dev@googlegroups.com>,
        <linux-kernel@vger.kernel.org>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        George Dunlap <george.dunlap@citrix.com>,
        Ross Lagerwall <ross.lagerwall@citrix.com>,
        "sergey.dyasli@citrix.com >> Sergey Dyasli" 
        <sergey.dyasli@citrix.com>
References: <20191217140804.27364-1-sergey.dyasli@citrix.com>
 <7301D02C-D33F-4205-BB32-C3E61015D26E@ORACLE.COM>
From:   Sergey Dyasli <sergey.dyasli@citrix.com>
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Message-ID: <4595107c-64aa-5139-c86e-f5bff5b3d87d@citrix.com>
Date:   Fri, 20 Dec 2019 10:26:09 +0000
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 17/12/2019 18:06, Boris Ostrovsky wrote:
> 
> 
>> On Dec 17, 2019, at 9:08 AM, Sergey Dyasli <sergey.dyasli@citrix.com> 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