Re: [PATCH V2 00/10] KASan ppc64 support

[Christophe LEROY]

Hi Aneesh,

Are you still working on support for KASan for ppc64 ?

Thanks,
Christophe


Le 26/08/2015 Ã 19:14, Aneesh Kumar K.V a ÃcritÂ:
> Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> writes:
>
> > 2015-08-26 11:26 GMT+03:00 Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>:
> > > Hi,
> > >
> > > This patchset implements kernel address sanitizer for ppc64.
> > > Since ppc64 virtual address range is divided into different regions,
> > > we can't have one contigous area for the kasan shadow range. Hence
> > > we don't support the INLINE kasan instrumentation. With Outline
> > > instrumentation, we override the shadow_to_mem and mem_to_shadow
> > > callbacks, so that we map only the kernel linear range (ie,
> > > region with ID 0xc). For region with ID 0xd and 0xf (vmalloc
> > > and vmemmap ) we return the address of the zero page. This
> > > works because kasan doesn't track both vmemmap and vmalloc address.
> > >
> > > Known issues:
> > > * Kasan is not yet enabled for arch/powerpc/kvm
> > > * kexec hang
> > > * outline stack and global support
> >
> > Is there any problem with globals or you just didn't try it yet?
> > I think it should just work. You need only to add  --param
> > asan-globals=0 to KBUILD_CFLAGS_MODULE
> > to disable it for modules.
>
> I am hitting BUG_ON in early vmalloc code. I still haven't got time to
> debug it further. Should get to that soon.
>
> -aneesh
>
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