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Date: Tue, 3 Mar 2015 11:02:31 -0500
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Andrey Ryabinin <a.ryabinin@...sung.com>
Cc: "Luis R. Rodriguez" <mcgrof@...e.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Rusty Russell <rusty@...tcorp.com.au>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...capital.net>,
Chris Wright <chrisw@...s-sol.org>,
xen-devel@...ts.xenproject.org,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
virtualization@...ts.linux-foundation.org,
Alok Kataria <akataria@...are.com>
Subject: Re: [Xen-devel] kasan_map_early_shadow() on Xen
On Tue, Mar 03, 2015 at 06:38:20PM +0300, Andrey Ryabinin wrote:
> On 03/03/2015 05:16 PM, Konrad Rzeszutek Wilk wrote:
> > On Tue, Mar 03, 2015 at 04:15:06PM +0300, Andrey Ryabinin wrote:
> >> On 03/03/2015 12:40 PM, Luis R. Rodriguez wrote:
> >>> Andrey,
> >>>
> >>> I believe that on Xen we should disable kasan, would like confirmation
> >>
> >> I guess Xen guests won't work with kasan because Xen guests doesn't setup shadow
> >> (kasan_map_early_shadow() is not called in xen guests).
> >>
> >> Disabling kasan for Xen in Kconfig is undesirable because that will disable kasan
> >> for allmodconfig and allyesconfig builds, but I don't see other option for now.
> >
> > Was there an bug reported for this? It would be good to CC the maintainers
> > of Xen on that sort of thing.
> >
>
> There was no report for this. I just looked at Xen code because of this Luis's mail
> and I don't see how it could work with kasan.
Ahh.
> Fixing this might be not trivial. We need to setup shadow memory before any kasan instrumented
> function will run.
> This is like with -fstack-protector (you need to setup gdt before calling any stack protected function).
If it is like that - then just using what had to be implemented
for the stack protection as a template ought to pave most of the
work?
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