Re: [PATCH 0/3] arm64: kasan: support CONFIG_KASAN_VMALLOC

[Andrey Konovalov]

On Sun, Jan 3, 2021 at 6:12 PM Lecopzer Chen <lecopzer@xxxxxxxxx> wrote:
>
> Linux supports KAsan for VMALLOC since commit 3c5c3cfb9ef4da9
> ("kasan: support backing vmalloc space with real shadow memory")
>
> Acroding to how x86 ported it [1], they early allocated p4d and pgd,
> but in arm64 I just simulate how KAsan supports MODULES_VADDR in arm64
> by not to populate the vmalloc area except for kimg address.
>
> Test environment:
>     4G and 8G Qemu virt,
>     39-bit VA + 4k PAGE_SIZE with 3-level page table,
>     test by lib/test_kasan.ko and lib/test_kasan_module.ko
>
> It also works in Kaslr with CONFIG_RANDOMIZE_MODULE_REGION_FULL,
> but not test for HW_TAG(I have no proper device), thus keep
> HW_TAG and KASAN_VMALLOC mutual exclusion until confirming
> the functionality.
>
>
> [1]: commit 0609ae011deb41c ("x86/kasan: support KASAN_VMALLOC")
>
> Signed-off-by: Lecopzer Chen <lecopzer.chen@xxxxxxxxxxxx>

Hi Lecopzer,

Thanks for working on this!

Acked-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Tested-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>

for the series along with the other two patches minding the nit in patch #3.

Will, Catalin, could you please take a look at the arm changes?

Thanks!