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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no 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 0CA53C433E0 for ; Fri, 12 Mar 2021 13:53:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A408064FB8 for ; Fri, 12 Mar 2021 13:53:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A408064FB8 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 238B08D0354; Fri, 12 Mar 2021 08:53:05 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 20F5C8D0346; Fri, 12 Mar 2021 08:53:05 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0B2658D0354; Fri, 12 Mar 2021 08:53:05 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0104.hostedemail.com [216.40.44.104]) by kanga.kvack.org (Postfix) with ESMTP id E1FC68D0346 for ; Fri, 12 Mar 2021 08:53:04 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id A48D4840C for ; Fri, 12 Mar 2021 13:53:04 +0000 (UTC) X-FDA: 77911363488.12.A0C28DF Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) by imf19.hostedemail.com (Postfix) with ESMTP id 9FC9490009E8 for ; Fri, 12 Mar 2021 13:53:01 +0000 (UTC) Received: by mail-pl1-f180.google.com with SMTP id j6so11954181plx.6 for ; Fri, 12 Mar 2021 05:53:04 -0800 (PST) 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=aih4YwIUaxwo1xIQPYb13vTPOicVAxjDZ9nf+fTCPBc=; b=CZjD9K3Aw7FwEtP7Ty5YY5HLoe5+N9ftfgu69EqzTEUiByHeETAIg0GnzuFLX8fiox sKSbB7tYONMHAjZc9DhtE9cVjRPlRITx57XsY0ZVGgvOcRsaT4joDGey/sB2v+CC704l uXHjT1PB8xd9SoxZbfYj7xxfNfb/vSuE0bS7S9U/0TClGTQ9sYE+P+w6C1OdPeOBzxSp U/XZcRKt59Vpl4MU8KWPrKe01taXowQp2gQsmwhx2bFnoldsecj4IViNDIBDqF4I9DcH rUXh838KJucvFvVw66wccD7UG28p/4dbIPPehLCsqmd0+mbbbS1VzV7aVGd/v3WyOBVK Ocmg== 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=aih4YwIUaxwo1xIQPYb13vTPOicVAxjDZ9nf+fTCPBc=; b=TWzRn1qespNEVWyQLC5O01WiXB/bU+bK18v5CDd2NfCpHHcgk6WZBG9mZO7alQxE8O bwSywAZ4jMIyQSkVZYqN6Fvp0WZyUQYh6Ko27CYClH/ilhvpuN9vyhTGDm523bPKYLCV 6UOBTpnFz+1UkQ3AXwvXHhqYU7BfMPMrfWg5P0Nge+tMM00S1xribhdfPPIzbAxbs05R ArdyLekvDN72xCc/LJc6i7FKBbIRbO9O6iDeiscSuQKOrFSQpzNQbrvx7u5aeqLY/JLH KgcGqYy/CEBqFoPZBUFboxoK9svieszJg0HRiiK7diK6qQP/o8qgiVzbk1Q5qQMF5d/d D2iA== X-Gm-Message-State: AOAM531lQblU/t61uKqv/2HppxdVH/pV6gVD2eLjktWwHiOiJS7+P+1c 1LLyKaCGGmeHUofcJqcRQ5fyKyJUdpYeiyd91fJPKw== X-Google-Smtp-Source: ABdhPJzs5IsAsolvlcB9EgNi2ACAWXfkQZL/2b8MIoeYQbEAkzD9gIojtI1jcmDWxKeyD3JjoXyCra9W0I/uQ9AIMmk= X-Received: by 2002:a17:90a:8c08:: with SMTP id a8mr14442823pjo.136.1615557183176; Fri, 12 Mar 2021 05:53:03 -0800 (PST) MIME-Version: 1.0 References: <6cb4988a241f086be7e7df3eea79416a53377ade.1615498565.git.andreyknvl@google.com> In-Reply-To: From: Andrey Konovalov Date: Fri, 12 Mar 2021 14:52:52 +0100 Message-ID: Subject: Re: [PATCH 09/11] kasan: docs: update shadow memory section To: Marco Elver Cc: Andrew Morton , Alexander Potapenko , Andrey Ryabinin , Dmitry Vyukov , kasan-dev , Linux Memory Management List , LKML Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: pa3xgidjzm5iexsr9pqewagqr3smrxkf X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 9FC9490009E8 Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf19; identity=mailfrom; envelope-from=""; helo=mail-pl1-f180.google.com; client-ip=209.85.214.180 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615557181-529149 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 Fri, Mar 12, 2021 at 11:52 AM Marco Elver wrote: > > On Thu, Mar 11, 2021 at 10:37PM +0100, Andrey Konovalov wrote: > [...] > > -The kernel maps memory in a number of different parts of the address > > -space. This poses something of a problem for KASAN, which requires > > -that all addresses accessed by instrumented code have a valid shadow > > -region. > > - > > -The range of kernel virtual addresses is large: there is not enough > > -real memory to support a real shadow region for every address that > > -could be accessed by the kernel. > > +The kernel maps memory in several different parts of the address space. > > +The range of kernel virtual addresses is large: there is not enough real > > +memory to support a real shadow region for every address that could be > > +accessed by the kernel. Therefore, KASAN only maps real shadow for certain > > +parts of the address space. > > > > By default > > ~~~~~~~~~~ > > While we're here, can we change this "By default" heading which seems > wrong -- the paragraph starts with "By default, ..." as well. > > Perhaps "Default Behaviour"? Sounds good, thanks!