[PATCH v6 0/6] KASAN for arm64

Ard Biesheuvel ard.biesheuvel at linaro.org
Thu Oct 8 05:09:26 PDT 2015

On 8 October 2015 at 13:23, Andrey Ryabinin <ryabinin.a.a at gmail.com> wrote:
> On 10/08/2015 02:11 PM, Mark Rutland wrote:
>> On Thu, Oct 08, 2015 at 01:36:09PM +0300, Andrey Ryabinin wrote:
>>> 2015-10-07 13:04 GMT+03:00 Catalin Marinas <catalin.marinas at arm.com>:
>>>> On Thu, Sep 17, 2015 at 12:38:06PM +0300, Andrey Ryabinin wrote:
>>>>> As usual patches available in git
>>>>>       git://github.com/aryabinin/linux.git kasan/arm64v6
>>>>> Changes since v5:
>>>>>  - Rebase on top of 4.3-rc1
>>>>>  - Fixed EFI boot.
>>>>>  - Updated Doc/features/KASAN.
>>>> I tried to merge these patches (apart from the x86 one which is already
>>>> merged) but it still doesn't boot on Juno as an EFI application.
>>> 4.3-rc1 was ok and 4.3-rc4 is not. Break caused by 0ce3cc008ec04
>>> ("arm64/efi: Fix boot crash by not padding between EFI_MEMORY_RUNTIME
>>> regions")
>>> It introduced sort() call in efi_get_virtmap().
>>> sort() is generic kernel function and it's instrumented, so we crash
>>> when KASAN tries to access shadow in sort().
>> I believe this is solved by Ard's stub isolation series [1,2], which
>> will build a stub-specific copy of sort() and various other functions
>> (see the arm-deps in [2]).
>> So long as the stub is not built with ASAN, that should work.
> Thanks, this should help, as we already build the stub without ASAN instrumentation.

Indeed. I did not mention instrumentation in the commit log for those
patches, but obviously, something like KASAN instrumentation cannot be
tolerated in the stub since it makes assumptions about the memory

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