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b=waO5M7TU9BYoRGjtorAnNJETXm72HFsA3Y0tFfhW85iW307Pc3Fq86bh7keOgjgLE ktpXe34fCWJ/hIBD3X4zZpOX2irMQA3Ga0Vr8rilIjKxKv0uR7kEYqCu1sIk7u49Cu IOOyVz6paX9t7Kdqkgl01NvAx2e8rkGiaTJ3GKyI= Date: Mon, 1 Sep 2025 12:23:16 -0700 From: Andrew Morton To: Yeoreum Yun Cc: ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org, scott@os.amperecomputing.com, jhubbard@nvidia.com, pankaj.gupta@amd.com, leitao@debian.org, kaleshsingh@google.com, maz@kernel.org, broonie@kernel.org, oliver.upton@linux.dev, james.morse@arm.com, ardb@kernel.org, hardevsinh.palaniya@siliconsignals.io, david@redhat.com, yang@os.amperecomputing.com, kasan-dev@googlegroups.com, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Subject: Re: [PATCH v6 1/2] kasan/hw-tags: introduce kasan.write_only option Message-Id: <20250901122316.6b7d8d7fdcf03bdb2aa4960a@linux-foundation.org> In-Reply-To: <20250901104623.402172-2-yeoreum.yun@arm.com> References: <20250901104623.402172-1-yeoreum.yun@arm.com> <20250901104623.402172-2-yeoreum.yun@arm.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 0CC2320005 X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: 88ktq849ru9gtkcq88iczku7fkipxctp X-HE-Tag: 1756754598-185054 X-HE-Meta: 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 H89oc69y 61mpyPr7wEjzvHuTPdROiqR0ouA917E21dFuKGNNEMwjsuucxYsaHj/EzU21/iyBJ9AL1pVvYklwfr04tA5ua8paZBNvO3NCWwzDAMB3toKu5yyo5rZOAqiErVicNpuc7WZgAwDcmvxOS9nevsawqJZEDPWFaO+uckj+fWwhnqot8SZp1hqYkZhMCaH7BHkf4Kp4Yw+wX92dyoRkojweaDvHteK/8T+O+QsQJ1CBXkiqs+pBK4GoYvqWOLGResQNpviB9Pjo9GD+73WcwmS8xYBQEULlhV0ZoAzdeo8R3fowQQltz1wdfNXgyNMSvoRqXEedsZ1JcTQKAKHNPvuXoorWqnrPbPorNwuUuewnIFOGr0XRuvC1ommP71m2gydVp66nB1MLHYekZjs4zUBrM21Du2SUy1BqA5K8uLx4pQlu/b6M= 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: List-Subscribe: List-Unsubscribe: On Mon, 1 Sep 2025 11:46:22 +0100 Yeoreum Yun wrote: > Since Armv8.9, FEATURE_MTE_STORE_ONLY feature is introduced to restrict > raise of tag check fault on store operation only. > Introcude KASAN write only mode based on this feature. > > KASAN write only mode restricts KASAN checks operation for write only and > omits the checks for fetch/read operations when accessing memory. > So it might be used not only debugging enviroment but also normal > enviroment to check memory safty. > > This features can be controlled with "kasan.write_only" arguments. > When "kasan.write_only=on", KASAN checks write operation only otherwise > KASAN checks all operations. > > This changes the MTE_STORE_ONLY feature as BOOT_CPU_FEATURE like > ARM64_MTE_ASYMM so that makes it initialise in kasan_init_hw_tags() > with other function together. > > ... > > > - pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s)\n", > + pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s, write_only=%s\n", > kasan_mode_info(), This lost the closing ")" in the printk control string. I fixed that up while resolving rejects.