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Fri, 22 Jan 2021 19:05:12 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l31k5-0006j0-Bh; Fri, 22 Jan 2021 19:05:10 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id DCB2023AC1; Fri, 22 Jan 2021 19:05:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611342308; bh=+qH3gg6Meer9DE4CWsvTMl0NEy6N7sOI6C6cFplb2Ok=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UAhzpczDkGt+4Q3wMOMG4ZZXBOvrjUmqZqNB6yHgubCMaaFUJ6/FOXNv20BtOGbEL y+0kx3bop4iL/FKIG8N8x6obiAHhfyoeT2tZwJkqqiMHoV3Ll5eanEyHXSq61pADAo KuCY+6gOu7i7M+fEjba1vK0mXIcdQFNTowLMDJ2h3KdJDBgGUZAyd0pY8nUG9Iaota bsOyCWRnhpVW/I2fYed0GkkovQdB2bQ5IzATRdp2a8isQwbRqwA50nvq+AtGfCzZ4g gCHP89gVZ0e6MmQ0GnM4WiYyK3n6kurG0uNXOXYFvnWOjXbiNt/EOJg3yhrdYXOZgU Vko9JDUN8/sgA== Date: Fri, 22 Jan 2021 19:05:01 +0000 From: Will Deacon To: Andrey Konovalov Subject: Re: [PATCH v2 0/4] arm64: kasan: support CONFIG_KASAN_VMALLOC Message-ID: <20210122190501.GA25471@willie-the-truck> References: <20210109103252.812517-1-lecopzer@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210122_140509_522221_E038A720 X-CRM114-Status: GOOD ( 19.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lecopzer Chen , Catalin Marinas , LKML , Linux Memory Management List , tyhicks@linux.microsoft.com, Alexander Potapenko , Vincenzo Frascino , Ard Biesheuvel , yj.chiang@mediatek.com, kasan-dev , Linux ARM , Andrey Ryabinin , Guenter Roeck , Lecopzer Chen , Mark Brown , "moderated list:ARM/Mediatek SoC..." , Dan Williams , Dmitry Vyukov , gustavoars@kernel.org, Andrew Morton , Robin Murphy , rppt@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jan 21, 2021 at 06:44:14PM +0100, Andrey Konovalov wrote: > On Sat, Jan 9, 2021 at 11:33 AM 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 > > and randomize module region inside vmalloc area. > > > > > > [1]: commit 0609ae011deb41c ("x86/kasan: support KASAN_VMALLOC") > > > > Signed-off-by: Lecopzer Chen > > Acked-by: Andrey Konovalov > > Tested-by: Andrey Konovalov > > > > > > v2 -> v1 > > 1. kasan_init.c tweak indent > > 2. change Kconfig depends only on HAVE_ARCH_KASAN > > 3. support randomized module region. > > > > v1: > > https://lore.kernel.org/lkml/20210103171137.153834-1-lecopzer@gmail.com/ > > > > Lecopzer Chen (4): > > arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC > > arm64: kasan: abstract _text and _end to KERNEL_START/END > > arm64: Kconfig: support CONFIG_KASAN_VMALLOC > > arm64: kaslr: support randomized module area with KASAN_VMALLOC > > > > arch/arm64/Kconfig | 1 + > > arch/arm64/kernel/kaslr.c | 18 ++++++++++-------- > > arch/arm64/kernel/module.c | 16 +++++++++------- > > arch/arm64/mm/kasan_init.c | 29 +++++++++++++++++++++-------- > > 4 files changed, 41 insertions(+), 23 deletions(-) > > > > -- > > 2.25.1 > > > > Hi Will, > > Could you PTAL at the arm64 changes? Sorry, wanted to get to this today but I ran out of time in the end. On the list for next week! Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel