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=-23.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 5AC95C4320E for ; Mon, 9 Aug 2021 11:22:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4017361004 for ; Mon, 9 Aug 2021 11:22:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235068AbhHILWT (ORCPT ); Mon, 9 Aug 2021 07:22:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235045AbhHILWQ (ORCPT ); Mon, 9 Aug 2021 07:22:16 -0400 Received: from mail-oi1-x229.google.com (mail-oi1-x229.google.com [IPv6:2607:f8b0:4864:20::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84295C0613D3 for ; Mon, 9 Aug 2021 04:21:56 -0700 (PDT) Received: by mail-oi1-x229.google.com with SMTP id x15so22954759oic.9 for ; Mon, 09 Aug 2021 04:21:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=MkFYGolSn2w76q7qvE9Vgn56UKUzs1q54gLC/lVyUL0=; b=nTtfeLWmlog6HIdLAdJWj+U2ll9LsyOAiDIU37OqlU+wNkW06mzFthb3f13iLu2sko gCngmmCfLVZI/cwANabGrtvm4GOBAwyG+imZLE+Ge0iHRC4QPDlSW2XzKAfUPk6Fe+vr FZY6qy0YCXNPKlpJSxL+XWQYJrzbH59GPQEwNnaATrI16KEUvKYEnHB1DYx+PkrSSIq+ lxofn9poMXLJyZZY9yYKKolURLjvFzQ62TjO9AWNwhY+/oO1k2tm/iX8VFCx3yoMU1Lh DId6g6IzFAYitx5J5OzdurL+dE7DnMmuzL6jNtmXnOMopmnhC8EtcVjFnF82s74ha0zM cYcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=MkFYGolSn2w76q7qvE9Vgn56UKUzs1q54gLC/lVyUL0=; b=OHsPb9VFxpcrwzQ/ugk7ZC3FJUsPK8WnkQuZiB11Sbc5a+qCoHckfsyQPkKEbGp4uY 1oXYC16C7h9CmHHD9QI4YhntI0yCzFlbbLXeSIYIcdgSrHjHrXo1bhXBXWVAyk64tkis gcuy1pAcuIGRZ4VHfzB3wgUqW1LpBBIUKNEIJF/4ZA85kFhKVrlnngHNalfHef0hJg2H 6IEyfLaE8Wj4InD5FpdWk5k8f0rb+VAmftwbDAKt0ILqxITBEKLLsar3um+g7JIgKUEi 8AL2FjT4x3OF3x9YwVCQIO04YPV+GyjfarXJZgzqakBFbHM8ovVdOO4jHwZro7XTzCUY LGVw== X-Gm-Message-State: AOAM532I8dz7IenjVlJFHINSuH48SMy/QrzVyCfPs7wNqFFJ/sy5m441 6PiFA9LbnSz1JSONU6IxYuQf/6TcNFCc7P2LZrDOKA== X-Google-Smtp-Source: ABdhPJw2dAx0xwZwf7oFVAglW4Mx/VmIQLu0Vm32HDbc5/1HQi39uzQswpjxiizzKhJAa4SszTrlfB8qBvg9IZhyb4I= X-Received: by 2002:aca:2316:: with SMTP id e22mr9967822oie.172.1628508115719; Mon, 09 Aug 2021 04:21:55 -0700 (PDT) MIME-Version: 1.0 References: <20210809093750.131091-1-wangkefeng.wang@huawei.com> <20210809093750.131091-4-wangkefeng.wang@huawei.com> In-Reply-To: From: Marco Elver Date: Mon, 9 Aug 2021 13:21:44 +0200 Message-ID: Subject: Re: [PATCH v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC To: Kefeng Wang Cc: will@kernel.org, catalin.marinas@arm.com, ryabinin.a.a@gmail.com, andreyknvl@gmail.com, dvyukov@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 9 Aug 2021 at 13:10, Kefeng Wang wrote: > > > On 2021/8/9 17:37, 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. > > Should add Acked-by: Marco Elver [for KASAN parts] , My Ack is still valid, thanks for noting. > > Signed-off-by: Kefeng Wang > > --- > > arch/arm64/mm/kasan_init.c | 16 ++++++++++++++++ > > include/linux/kasan.h | 6 ++++++ > > mm/kasan/init.c | 5 +++++ > > mm/vmalloc.c | 1 + > > 4 files changed, 28 insertions(+) > > > > diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c > > index 61b52a92b8b6..5b996ca4d996 100644 > > --- a/arch/arm64/mm/kasan_init.c > > +++ b/arch/arm64/mm/kasan_init.c > > @@ -287,6 +287,22 @@ static void __init kasan_init_depth(void) > > init_task.kasan_depth = 0; > > } > > > > +#ifdef CONFIG_KASAN_VMALLOC > > +void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size) > > +{ > > + unsigned long shadow_start, shadow_end; > > + > > + if (!is_vmalloc_or_module_addr(start)) > > + return; > > + > > + shadow_start = (unsigned long)kasan_mem_to_shadow(start); > > + shadow_start = ALIGN_DOWN(shadow_start, PAGE_SIZE); > > + shadow_end = (unsigned long)kasan_mem_to_shadow(start + size); > > + shadow_end = ALIGN(shadow_end, PAGE_SIZE); > > + kasan_map_populate(shadow_start, shadow_end, NUMA_NO_NODE); > > +} > > +#endif > > + > > void __init kasan_init(void) > > { > > kasan_init_shadow(); > > diff --git a/include/linux/kasan.h b/include/linux/kasan.h > > index dd874a1ee862..3f8c26d9ef82 100644 > > --- a/include/linux/kasan.h > > +++ b/include/linux/kasan.h > > @@ -133,6 +133,8 @@ struct kasan_cache { > > bool is_kmalloc; > > }; > > > > +void kasan_populate_early_vm_area_shadow(void *start, unsigned long size); > > + > > slab_flags_t __kasan_never_merge(void); > > static __always_inline slab_flags_t kasan_never_merge(void) > > { > > @@ -303,6 +305,10 @@ void kasan_restore_multi_shot(bool enabled); > > > > #else /* CONFIG_KASAN */ > > > > +static inline void kasan_populate_early_vm_area_shadow(void *start, > > + unsigned long size) > > +{ } > > + > > static inline slab_flags_t kasan_never_merge(void) > > { > > return 0; > > diff --git a/mm/kasan/init.c b/mm/kasan/init.c > > index cc64ed6858c6..d39577d088a1 100644 > > --- a/mm/kasan/init.c > > +++ b/mm/kasan/init.c > > @@ -279,6 +279,11 @@ int __ref kasan_populate_early_shadow(const void *shadow_start, > > return 0; > > } > > > > +void __init __weak kasan_populate_early_vm_area_shadow(void *start, > > + unsigned long size) > > +{ > > +} > > + > > static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd) > > { > > pte_t *pte; > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > > index 1e8fe08725b8..66a7e1ea2561 100644 > > --- a/mm/vmalloc.c > > +++ b/mm/vmalloc.c > > @@ -2253,6 +2253,7 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align) > > vm->addr = (void *)addr; > > > > vm_area_add_early(vm); > > + kasan_populate_early_vm_area_shadow(vm->addr, vm->size); > > } > > > > static void vmap_init_free_space(void) 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=-23.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 B0FE8C4320A for ; Mon, 9 Aug 2021 11:21:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3298660F8F for ; Mon, 9 Aug 2021 11:21:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3298660F8F Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 609F56B006C; Mon, 9 Aug 2021 07:21:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5B9DA6B0071; Mon, 9 Aug 2021 07:21:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4A8446B0073; Mon, 9 Aug 2021 07:21:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0216.hostedemail.com [216.40.44.216]) by kanga.kvack.org (Postfix) with ESMTP id 2F4366B006C for ; Mon, 9 Aug 2021 07:21:57 -0400 (EDT) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id CFB1C20408 for ; Mon, 9 Aug 2021 11:21:56 +0000 (UTC) X-FDA: 78455302632.14.DFDBD0B Received: from mail-oi1-f170.google.com (mail-oi1-f170.google.com [209.85.167.170]) by imf25.hostedemail.com (Postfix) with ESMTP id 8C7C7B000189 for ; Mon, 9 Aug 2021 11:21:56 +0000 (UTC) Received: by mail-oi1-f170.google.com with SMTP id u10so23012235oiw.4 for ; Mon, 09 Aug 2021 04:21:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=MkFYGolSn2w76q7qvE9Vgn56UKUzs1q54gLC/lVyUL0=; b=nTtfeLWmlog6HIdLAdJWj+U2ll9LsyOAiDIU37OqlU+wNkW06mzFthb3f13iLu2sko gCngmmCfLVZI/cwANabGrtvm4GOBAwyG+imZLE+Ge0iHRC4QPDlSW2XzKAfUPk6Fe+vr FZY6qy0YCXNPKlpJSxL+XWQYJrzbH59GPQEwNnaATrI16KEUvKYEnHB1DYx+PkrSSIq+ lxofn9poMXLJyZZY9yYKKolURLjvFzQ62TjO9AWNwhY+/oO1k2tm/iX8VFCx3yoMU1Lh DId6g6IzFAYitx5J5OzdurL+dE7DnMmuzL6jNtmXnOMopmnhC8EtcVjFnF82s74ha0zM cYcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=MkFYGolSn2w76q7qvE9Vgn56UKUzs1q54gLC/lVyUL0=; b=p99M28hmT2Ez0mP+couzipz8icrfTJCl9rMw3sSxwZ21AK3saIQIkAlaZaqgQDvi5Z tuzhtO3cTTnizu6ieQQrbP4iVGK1jC6FAcGKqM7dwRDcdRpKEW8BWgrfpfvtxZBHxG9+ 7Q8ZrOexNu3tn5s99MbHDe7dfZEMWNx+TzQa8JJV2OtVPFIsWubbKjYP+a8JnOpWE8eP y+yjGCLsvOL9o1e9jo1Keq45Cuhk7FtFtBv8w4VUS7MC3YaWp8vk6cSL8lTOLCRux7jd 8Tre7pY5Zc0kvgFAD9z5Vy143C52VSKXomNQm3+USGyQv5svHFrznZACAWsuPcRDotvh VqXw== X-Gm-Message-State: AOAM530E9G5S6yVFU8uT4HQgLwRyOLI1bq748qE76txoibP8eQdgy3Cx g/A6cA6i8Q0f0sGPuPFBwoEqROHelmXDLQzE3XDL6Q== X-Google-Smtp-Source: ABdhPJw2dAx0xwZwf7oFVAglW4Mx/VmIQLu0Vm32HDbc5/1HQi39uzQswpjxiizzKhJAa4SszTrlfB8qBvg9IZhyb4I= X-Received: by 2002:aca:2316:: with SMTP id e22mr9967822oie.172.1628508115719; Mon, 09 Aug 2021 04:21:55 -0700 (PDT) MIME-Version: 1.0 References: <20210809093750.131091-1-wangkefeng.wang@huawei.com> <20210809093750.131091-4-wangkefeng.wang@huawei.com> In-Reply-To: From: Marco Elver Date: Mon, 9 Aug 2021 13:21:44 +0200 Message-ID: Subject: Re: [PATCH v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC To: Kefeng Wang Cc: will@kernel.org, catalin.marinas@arm.com, ryabinin.a.a@gmail.com, andreyknvl@gmail.com, dvyukov@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=nTtfeLWm; spf=pass (imf25.hostedemail.com: domain of elver@google.com designates 209.85.167.170 as permitted sender) smtp.mailfrom=elver@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 8C7C7B000189 X-Stat-Signature: nqiwytcka9ccc3bg9wu77dzpk9zkujod X-HE-Tag: 1628508116-49363 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 Mon, 9 Aug 2021 at 13:10, Kefeng Wang wrote: > > > On 2021/8/9 17:37, 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. > > Should add Acked-by: Marco Elver [for KASAN parts] , My Ack is still valid, thanks for noting. > > Signed-off-by: Kefeng Wang > > --- > > arch/arm64/mm/kasan_init.c | 16 ++++++++++++++++ > > include/linux/kasan.h | 6 ++++++ > > mm/kasan/init.c | 5 +++++ > > mm/vmalloc.c | 1 + > > 4 files changed, 28 insertions(+) > > > > diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c > > index 61b52a92b8b6..5b996ca4d996 100644 > > --- a/arch/arm64/mm/kasan_init.c > > +++ b/arch/arm64/mm/kasan_init.c > > @@ -287,6 +287,22 @@ static void __init kasan_init_depth(void) > > init_task.kasan_depth = 0; > > } > > > > +#ifdef CONFIG_KASAN_VMALLOC > > +void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size) > > +{ > > + unsigned long shadow_start, shadow_end; > > + > > + if (!is_vmalloc_or_module_addr(start)) > > + return; > > + > > + shadow_start = (unsigned long)kasan_mem_to_shadow(start); > > + shadow_start = ALIGN_DOWN(shadow_start, PAGE_SIZE); > > + shadow_end = (unsigned long)kasan_mem_to_shadow(start + size); > > + shadow_end = ALIGN(shadow_end, PAGE_SIZE); > > + kasan_map_populate(shadow_start, shadow_end, NUMA_NO_NODE); > > +} > > +#endif > > + > > void __init kasan_init(void) > > { > > kasan_init_shadow(); > > diff --git a/include/linux/kasan.h b/include/linux/kasan.h > > index dd874a1ee862..3f8c26d9ef82 100644 > > --- a/include/linux/kasan.h > > +++ b/include/linux/kasan.h > > @@ -133,6 +133,8 @@ struct kasan_cache { > > bool is_kmalloc; > > }; > > > > +void kasan_populate_early_vm_area_shadow(void *start, unsigned long size); > > + > > slab_flags_t __kasan_never_merge(void); > > static __always_inline slab_flags_t kasan_never_merge(void) > > { > > @@ -303,6 +305,10 @@ void kasan_restore_multi_shot(bool enabled); > > > > #else /* CONFIG_KASAN */ > > > > +static inline void kasan_populate_early_vm_area_shadow(void *start, > > + unsigned long size) > > +{ } > > + > > static inline slab_flags_t kasan_never_merge(void) > > { > > return 0; > > diff --git a/mm/kasan/init.c b/mm/kasan/init.c > > index cc64ed6858c6..d39577d088a1 100644 > > --- a/mm/kasan/init.c > > +++ b/mm/kasan/init.c > > @@ -279,6 +279,11 @@ int __ref kasan_populate_early_shadow(const void *shadow_start, > > return 0; > > } > > > > +void __init __weak kasan_populate_early_vm_area_shadow(void *start, > > + unsigned long size) > > +{ > > +} > > + > > static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd) > > { > > pte_t *pte; > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > > index 1e8fe08725b8..66a7e1ea2561 100644 > > --- a/mm/vmalloc.c > > +++ b/mm/vmalloc.c > > @@ -2253,6 +2253,7 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align) > > vm->addr = (void *)addr; > > > > vm_area_add_early(vm); > > + kasan_populate_early_vm_area_shadow(vm->addr, vm->size); > > } > > > > static void vmap_init_free_space(void) 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=-14.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 DCD98C4338F for ; Mon, 9 Aug 2021 11:23:51 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9B3BA61004 for ; Mon, 9 Aug 2021 11:23:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9B3BA61004 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=UEUhVy7V9joJrKhbbDmlmbSdrv+yNEdoOMZ6f8d3RYE=; b=pEe243rPc6kVEu 94iVk2evc5jvjewlCP69VT0XugYv0wAIgRBkByS7zo84l8i56NKbhZw/uNzKg01NNJ9s9UNReo0V0 xWjLS8+5y/apwmwWu4/+qvjWk96nOv0xmrWUdADH8JwN/2dRlM/yhgXuQiv1Xu6gJmlVq9MqgX8p5 qNXE2S9xmrGxGaPpQJ8MqPHrjfwoqwff1i2rRy1+qogKqt4O5mgzOayaxtuMumlQShe9sjUZXO25Q jrA4bynfJi5uXMwNKZ4TFy5MdgJ4p4OdfAl86I6FerBKJoVzCvRvsfSYalmGk+ogRmZEst39zvXrb yKi5mT3NbMNNs6bJlfSQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mD3M4-000L6S-Bg; Mon, 09 Aug 2021 11:22:04 +0000 Received: from mail-oi1-x232.google.com ([2607:f8b0:4864:20::232]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mD3M0-000L3q-0s for linux-arm-kernel@lists.infradead.org; Mon, 09 Aug 2021 11:22:01 +0000 Received: by mail-oi1-x232.google.com with SMTP id u25so22989705oiv.5 for ; Mon, 09 Aug 2021 04:21:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=MkFYGolSn2w76q7qvE9Vgn56UKUzs1q54gLC/lVyUL0=; b=nTtfeLWmlog6HIdLAdJWj+U2ll9LsyOAiDIU37OqlU+wNkW06mzFthb3f13iLu2sko gCngmmCfLVZI/cwANabGrtvm4GOBAwyG+imZLE+Ge0iHRC4QPDlSW2XzKAfUPk6Fe+vr FZY6qy0YCXNPKlpJSxL+XWQYJrzbH59GPQEwNnaATrI16KEUvKYEnHB1DYx+PkrSSIq+ lxofn9poMXLJyZZY9yYKKolURLjvFzQ62TjO9AWNwhY+/oO1k2tm/iX8VFCx3yoMU1Lh DId6g6IzFAYitx5J5OzdurL+dE7DnMmuzL6jNtmXnOMopmnhC8EtcVjFnF82s74ha0zM cYcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=MkFYGolSn2w76q7qvE9Vgn56UKUzs1q54gLC/lVyUL0=; b=BhZdCuHb+lF+yE9L9CO3vC1iseKtecCg6A5U6PlUzzTHVK3DR6qhGGPaX00KG4QN2y 7qShCqPjrB4bRbLI8t2u5wR+kVJNO4qw47sckwYponaheY0imRRkN3XfUMDpjSxyRMy/ i6HpyMIV1OR1QNNiTCXjS9Jg1BXSAsO13AaiPNo/m4MlRb/1JYirX2+zdovcadvNToT8 BlxlVgYLbtFBZaftN5yZtYnkSRnH0RYTTQNHk11WEQ4JQlqqJRtguW2U3AIabGUFIWpX ulsOEeACIWi7dTxWutHrci72twt9EgD/7uYV29Wr6lm+mj28/qoXhxL57e6DXUzeK2JQ 7NnA== X-Gm-Message-State: AOAM530zQZOd1sV9DmQXhO77lZcq/Do2Y2VRCqvhVVggkK3O1uUJnxaW n8u6KpxnAgwfcL3CT195gQ8QEWdgqwuDf+ho6F7yIQ== X-Google-Smtp-Source: ABdhPJw2dAx0xwZwf7oFVAglW4Mx/VmIQLu0Vm32HDbc5/1HQi39uzQswpjxiizzKhJAa4SszTrlfB8qBvg9IZhyb4I= X-Received: by 2002:aca:2316:: with SMTP id e22mr9967822oie.172.1628508115719; Mon, 09 Aug 2021 04:21:55 -0700 (PDT) MIME-Version: 1.0 References: <20210809093750.131091-1-wangkefeng.wang@huawei.com> <20210809093750.131091-4-wangkefeng.wang@huawei.com> In-Reply-To: From: Marco Elver Date: Mon, 9 Aug 2021 13:21:44 +0200 Message-ID: Subject: Re: [PATCH v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC To: Kefeng Wang Cc: will@kernel.org, catalin.marinas@arm.com, ryabinin.a.a@gmail.com, andreyknvl@gmail.com, dvyukov@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210809_042200_110245_B1F03C19 X-CRM114-Status: GOOD ( 26.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Mon, 9 Aug 2021 at 13:10, Kefeng Wang wrote: > > > On 2021/8/9 17:37, 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. > > Should add Acked-by: Marco Elver [for KASAN parts] , My Ack is still valid, thanks for noting. > > Signed-off-by: Kefeng Wang > > --- > > arch/arm64/mm/kasan_init.c | 16 ++++++++++++++++ > > include/linux/kasan.h | 6 ++++++ > > mm/kasan/init.c | 5 +++++ > > mm/vmalloc.c | 1 + > > 4 files changed, 28 insertions(+) > > > > diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c > > index 61b52a92b8b6..5b996ca4d996 100644 > > --- a/arch/arm64/mm/kasan_init.c > > +++ b/arch/arm64/mm/kasan_init.c > > @@ -287,6 +287,22 @@ static void __init kasan_init_depth(void) > > init_task.kasan_depth = 0; > > } > > > > +#ifdef CONFIG_KASAN_VMALLOC > > +void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size) > > +{ > > + unsigned long shadow_start, shadow_end; > > + > > + if (!is_vmalloc_or_module_addr(start)) > > + return; > > + > > + shadow_start = (unsigned long)kasan_mem_to_shadow(start); > > + shadow_start = ALIGN_DOWN(shadow_start, PAGE_SIZE); > > + shadow_end = (unsigned long)kasan_mem_to_shadow(start + size); > > + shadow_end = ALIGN(shadow_end, PAGE_SIZE); > > + kasan_map_populate(shadow_start, shadow_end, NUMA_NO_NODE); > > +} > > +#endif > > + > > void __init kasan_init(void) > > { > > kasan_init_shadow(); > > diff --git a/include/linux/kasan.h b/include/linux/kasan.h > > index dd874a1ee862..3f8c26d9ef82 100644 > > --- a/include/linux/kasan.h > > +++ b/include/linux/kasan.h > > @@ -133,6 +133,8 @@ struct kasan_cache { > > bool is_kmalloc; > > }; > > > > +void kasan_populate_early_vm_area_shadow(void *start, unsigned long size); > > + > > slab_flags_t __kasan_never_merge(void); > > static __always_inline slab_flags_t kasan_never_merge(void) > > { > > @@ -303,6 +305,10 @@ void kasan_restore_multi_shot(bool enabled); > > > > #else /* CONFIG_KASAN */ > > > > +static inline void kasan_populate_early_vm_area_shadow(void *start, > > + unsigned long size) > > +{ } > > + > > static inline slab_flags_t kasan_never_merge(void) > > { > > return 0; > > diff --git a/mm/kasan/init.c b/mm/kasan/init.c > > index cc64ed6858c6..d39577d088a1 100644 > > --- a/mm/kasan/init.c > > +++ b/mm/kasan/init.c > > @@ -279,6 +279,11 @@ int __ref kasan_populate_early_shadow(const void *shadow_start, > > return 0; > > } > > > > +void __init __weak kasan_populate_early_vm_area_shadow(void *start, > > + unsigned long size) > > +{ > > +} > > + > > static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd) > > { > > pte_t *pte; > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > > index 1e8fe08725b8..66a7e1ea2561 100644 > > --- a/mm/vmalloc.c > > +++ b/mm/vmalloc.c > > @@ -2253,6 +2253,7 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align) > > vm->addr = (void *)addr; > > > > vm_area_add_early(vm); > > + kasan_populate_early_vm_area_shadow(vm->addr, vm->size); > > } > > > > static void vmap_init_free_space(void) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel