Hi Aneesh,

Are you still working on support for KASan for ppc64 ?

Thanks,
Christophe


Le 26/08/2015 à 19:14, Aneesh Kumar K.V a écrit :

Andrey Ryabinin [off-list ref] writes:

quoted

2015-08-26 11:26 GMT+03:00 Aneesh Kumar K.V [off-list ref]:

quoted

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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