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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 F128BC4320E for ; Mon, 9 Aug 2021 09:32:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA6A6610A1 for ; Mon, 9 Aug 2021 09:32:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234596AbhHIJcz (ORCPT ); Mon, 9 Aug 2021 05:32:55 -0400 Received: from szxga08-in.huawei.com ([45.249.212.255]:13255 "EHLO szxga08-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234525AbhHIJct (ORCPT ); Mon, 9 Aug 2021 05:32:49 -0400 Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.54]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4GjrTD16kVz1CV1f; Mon, 9 Aug 2021 17:32:16 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Mon, 9 Aug 2021 17:32:28 +0800 Received: from localhost.localdomain.localdomain (10.175.113.25) 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; Mon, 9 Aug 2021 17:32:27 +0800 From: Kefeng Wang To: , , , , , , CC: , , , Kefeng Wang Subject: [PATCH v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC Date: Mon, 9 Aug 2021 17:37:50 +0800 Message-ID: <20210809093750.131091-4-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210809093750.131091-1-wangkefeng.wang@huawei.com> References: <20210809093750.131091-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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) -- 2.26.2