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Fri, 12 Mar 2021 02:52:20 -0800 (PST) Received: from elver.google.com ([2a00:79e0:15:13:d5de:d45f:f79c:cb62]) by smtp.gmail.com with ESMTPSA id n186sm1707383wmn.22.2021.03.12.02.52.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 02:52:19 -0800 (PST) Date: Fri, 12 Mar 2021 11:52:14 +0100 From: Marco Elver To: Andrey Konovalov Cc: Andrew Morton , Alexander Potapenko , Andrey Ryabinin , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 09/11] kasan: docs: update shadow memory section Message-ID: References: <6cb4988a241f086be7e7df3eea79416a53377ade.1615498565.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6cb4988a241f086be7e7df3eea79416a53377ade.1615498565.git.andreyknvl@google.com> User-Agent: Mutt/2.0.5 (2021-01-21) X-Stat-Signature: udbg8aidzocu8mo174rq4fxaqho39rsb X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B88E0A0009EE Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf07; identity=mailfrom; envelope-from=""; helo=mail-wm1-f50.google.com; client-ip=209.85.128.50 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615546341-676265 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 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"?