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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 23DB6C433F5 for ; Tue, 26 Apr 2022 16:45:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B7DE46B0078; Tue, 26 Apr 2022 12:45:45 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B28936B007B; Tue, 26 Apr 2022 12:45:45 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A3E596B00A3; Tue, 26 Apr 2022 12:45:45 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.27]) by kanga.kvack.org (Postfix) with ESMTP id 96F106B0078 for ; Tue, 26 Apr 2022 12:45:45 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 6CC6BC97 for ; Tue, 26 Apr 2022 16:45:45 +0000 (UTC) X-FDA: 79399606650.14.0E1AD4F Received: from mail-ej1-f73.google.com (mail-ej1-f73.google.com [209.85.218.73]) by imf04.hostedemail.com (Postfix) with ESMTP id ED4D940048 for ; Tue, 26 Apr 2022 16:45:40 +0000 (UTC) Received: by mail-ej1-f73.google.com with SMTP id dt18-20020a170907729200b006f377ebe5cbso4559709ejc.22 for ; Tue, 26 Apr 2022 09:45:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=KgfdOYR2+eRzwy3N1nFbXjWhZjMyNN/8KPMy2HvUIiA=; b=DiXJaiB8AJMG8+A1MDOZ3VuBShHUCaL1GlKQxcD6mV0R7Av/UajF571MXN7vKcH+xJ B9d0v8KhVCzlQ+z94pkBBtVLTSnlc2yIkyIXP0B+bFCdaqtmHA9pe8/5NYuKcmD5Vy3L fA34cdtJjSamNgh5dsmbUVd7b9zA7hnjKOjdt88/6jqxc/UG3ZHi4m5Nam5rWzqbzqPm cd06DBJ3ACVxlq9XrgpCh+wVKQori1dj0NvbQ7HSZw0NjHsIf9jtgKdLkxo1euBXeZpk ExnDMib7ea+byjuGF4JqXiPnkpgw3Zh2HRRI3cVSjxCjQ97crsBXKlz1IuJlZ96GONPP Cgcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=KgfdOYR2+eRzwy3N1nFbXjWhZjMyNN/8KPMy2HvUIiA=; b=bU9BfaEglgrMdGomJAwN7Uqx0wKUy6QeTBIfBhhNOMGl9TP6E/QYMcyjOTho+zLZ/c d9beI4x+QLXNZMh+qmdPC7IlwSnsiw+RTmnumptMZ+lNxBcbeneDkDhTRKwlWvoIoQaN qGWxJZc5Fi4c2S1AuYhWe1fHq//vkxp3X3L7IpbAt7CjnRFc067FIQcEtZp4uAU3+6sP bCVGVlh3f9F21TFlLfJmAejeg6WYXUDy6+ZgS60NQh3WMCqrmJNGwSy7p+eCUe6nQ04B rk3LAzTquotBvL5Q2haoOU8vf+25RsZpUkaBHubO9xNt4j1BhwW/hPlIJNL7cJh/t+x1 tTtg== X-Gm-Message-State: AOAM532EnEngmlYE6bomPQcMmEhCMNT+RZ6Ho51rqhkyvKtzkkvjNSs+ R/ZZHBkBXhziYPiaLdBMa1RAxhbPsGc= X-Google-Smtp-Source: ABdhPJzCT8fH32RoUVNaiZCyh2VQrj6uF5kLZlCQX+kBGFsZsTKhLxpnKoIswBSqwHZF0t1dzIj5uX6h2dU= X-Received: from glider.muc.corp.google.com ([2a00:79e0:15:13:d580:abeb:bf6d:5726]) (user=glider job=sendgmr) by 2002:a05:6402:26c7:b0:423:e5d6:b6c6 with SMTP id x7-20020a05640226c700b00423e5d6b6c6mr25480700edd.61.1650991543391; Tue, 26 Apr 2022 09:45:43 -0700 (PDT) Date: Tue, 26 Apr 2022 18:43:01 +0200 In-Reply-To: <20220426164315.625149-1-glider@google.com> Message-Id: <20220426164315.625149-33-glider@google.com> Mime-Version: 1.0 References: <20220426164315.625149-1-glider@google.com> X-Mailer: git-send-email 2.36.0.rc2.479.g8af0fa9b8e-goog Subject: [PATCH v3 32/46] kmsan: disable physical page merging in biovec From: Alexander Potapenko To: glider@google.com Cc: Alexander Viro , Andrew Morton , Andrey Konovalov , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Christoph Hellwig , Christoph Lameter , David Rientjes , Dmitry Vyukov , Eric Dumazet , Greg Kroah-Hartman , Herbert Xu , Ilya Leoshkevich , Ingo Molnar , Jens Axboe , Joonsoo Kim , Kees Cook , Marco Elver , Mark Rutland , Matthew Wilcox , "Michael S. Tsirkin" , Pekka Enberg , Peter Zijlstra , Petr Mladek , Steven Rostedt , Thomas Gleixner , Vasily Gorbik , Vegard Nossum , Vlastimil Babka , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: njjyhkt7xownwikhgjy3brctfnhu98qd Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=DiXJaiB8; spf=pass (imf04.hostedemail.com: domain of 3tyFoYgYKCLQafcXYlaiiafY.Wigfchor-ggepUWe.ila@flex--glider.bounces.google.com designates 209.85.218.73 as permitted sender) smtp.mailfrom=3tyFoYgYKCLQafcXYlaiiafY.Wigfchor-ggepUWe.ila@flex--glider.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: ED4D940048 X-HE-Tag: 1650991540-899833 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: KMSAN metadata for adjacent physical pages may not be adjacent, therefore accessing such pages together may lead to metadata corruption. We disable merging pages in biovec to prevent such corruptions. Signed-off-by: Alexander Potapenko --- Link: https://linux-review.googlesource.com/id/Iece16041be5ee47904fbc98121b105e5be5fea5c --- block/blk.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/block/blk.h b/block/blk.h index 8ccbc6e076369..95815ac559743 100644 --- a/block/blk.h +++ b/block/blk.h @@ -93,6 +93,13 @@ static inline bool biovec_phys_mergeable(struct request_queue *q, phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset; phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset; + /* + * Merging adjacent physical pages may not work correctly under KMSAN + * if their metadata pages aren't adjacent. Just disable merging. + */ + if (IS_ENABLED(CONFIG_KMSAN)) + return false; + if (addr1 + vec1->bv_len != addr2) return false; if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) -- 2.36.0.rc2.479.g8af0fa9b8e-goog