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Fri, 08 Jan 2021 10:30:43 -0800 (PST) MIME-Version: 1.0 References: <20210103171137.153834-1-lecopzer@gmail.com> In-Reply-To: <20210103171137.153834-1-lecopzer@gmail.com> From: Andrey Konovalov Date: Fri, 8 Jan 2021 19:30:33 +0100 Message-ID: Subject: Re: [PATCH 0/3] arm64: kasan: support CONFIG_KASAN_VMALLOC To: Lecopzer Chen , Catalin Marinas , Will Deacon Cc: LKML , Linux Memory Management List , kasan-dev , Linux ARM , Dan Williams , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Andrew Morton , linux-mediatek@lists.infradead.org, yj.chiang@mediatek.com, Lecopzer Chen Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Jan 3, 2021 at 6:12 PM Lecopzer Chen 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 Hi Lecopzer, Thanks for working on this! Acked-by: Andrey Konovalov Tested-by: Andrey Konovalov 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!