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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id v124sm18898827qkh.46.2019.02.13.07.36.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 13 Feb 2019 07:36:51 -0800 (PST) Message-ID: <1550072210.6911.28.camel@lca.pw> Subject: Re: [PATCH v2 3/5] kmemleak: account for tagged pointers when calculating pointer range From: Qian Cai To: Andrey Konovalov , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Catalin Marinas , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Vincenzo Frascino , Kostya Serebryany , Evgeniy Stepanov Date: Wed, 13 Feb 2019 10:36:50 -0500 In-Reply-To: <16e887d442986ab87fe87a755815ad92fa431a5f.1550066133.git.andreyknvl@google.com> References: <16e887d442986ab87fe87a755815ad92fa431a5f.1550066133.git.andreyknvl@google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit 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 Wed, 2019-02-13 at 14:58 +0100, Andrey Konovalov wrote: > kmemleak keeps two global variables, min_addr and max_addr, which store > the range of valid (encountered by kmemleak) pointer values, which it > later uses to speed up pointer lookup when scanning blocks. > > With tagged pointers this range will get bigger than it needs to be. > This patch makes kmemleak untag pointers before saving them to min_addr > and max_addr and when performing a lookup. > > Signed-off-by: Andrey Konovalov Tested-by: Qian Cai