From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D403C63797 for ; Thu, 22 Jul 2021 12:14:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A43906128D for ; Thu, 22 Jul 2021 12:14:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A43906128D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 190D26B0033; 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Thu, 22 Jul 2021 20:08:46 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 22 Jul 2021 20:14:34 +0800 Received: from [10.174.177.243] (10.174.177.243) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 22 Jul 2021 20:14:34 +0800 Subject: Re: [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC To: Marco Elver CC: Catalin Marinas , Will Deacon , Andrey Ryabinin , Andrey Konovalov , Dmitry Vyukov , , , , References: <20210720025105.103680-1-wangkefeng.wang@huawei.com> <20210720025105.103680-4-wangkefeng.wang@huawei.com> From: Kefeng Wang Message-ID: <99a9334e-ccda-dde9-954f-6717946324f8@huawei.com> Date: Thu, 22 Jul 2021 20:14:33 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Authentication-Results: imf24.hostedemail.com; dkim=none; spf=pass (imf24.hostedemail.com: domain of wangkefeng.wang@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=wangkefeng.wang@huawei.com; dmarc=pass (policy=none) header.from=huawei.com X-Rspamd-Server: rspam05 X-Stat-Signature: p1wwxir5o95xdj6rf1o8pbrpfziycujy X-Rspamd-Queue-Id: BAF34B0000BE X-HE-Tag: 1626956078-7748 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 2021/7/22 19:00, Marco Elver wrote: > On Tue, Jul 20, 2021 at 10:51AM +0800, Kefeng Wang wrote: >> With KASAN_VMALLOC and NEED_PER_CPU_PAGE_FIRST_CHUNK, it crashs, >> >> Unable to handle kernel paging request at virtual address ffff7000028f2000 >> ... >> swapper pgtable: 64k pages, 48-bit VAs, pgdp=0000000042440000 >> [ffff7000028f2000] pgd=000000063e7c0003, p4d=000000063e7c0003, pud=000000063e7c0003, pmd=000000063e7b0003, pte=0000000000000000 >> Internal error: Oops: 96000007 [#1] PREEMPT SMP >> Modules linked in: >> CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.0-rc4-00003-gc6e6e28f3f30-dirty #62 >> Hardware name: linux,dummy-virt (DT) >> pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO BTYPE=--) >> pc : kasan_check_range+0x90/0x1a0 >> lr : memcpy+0x88/0xf4 >> sp : ffff80001378fe20 >> ... >> Call trace: >> kasan_check_range+0x90/0x1a0 >> pcpu_page_first_chunk+0x3f0/0x568 >> setup_per_cpu_areas+0xb8/0x184 >> start_kernel+0x8c/0x328 >> >> The vm area used in vm_area_register_early() has no kasan shadow memory, >> Let's add a new kasan_populate_early_vm_area_shadow() function to populate >> the vm area shadow memory to fix the issue. >> >> Signed-off-by: Kefeng Wang > Acked-by: Marco Elver > > for the kasan bits. Thanks Marco.