linux-kernel - Re: [PATCH 0/3] arm64: kasan: support CONFIG_KASAN

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Date:   Fri, 8 Jan 2021 19:30:33 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Lecopzer Chen <lecopzer@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mediatek@...ts.infradead.org, yj.chiang@...iatek.com,
        Lecopzer Chen <lecopzer.chen@...iatek.com>
Subject: Re: [PATCH 0/3] arm64: kasan: support CONFIG_KASAN_VMALLOC

On Sun, Jan 3, 2021 at 6:12 PM Lecopzer Chen <lecopzer@...il.com> 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@...iatek.com>

Hi Lecopzer,

Thanks for working on this!

Acked-by: Andrey Konovalov <andreyknvl@...gle.com>
Tested-by: Andrey Konovalov <andreyknvl@...gle.com>

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!