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Thu, 18 Sep 2025 07:47:36 -0700 (PDT) Message-ID: Date: Thu, 18 Sep 2025 16:47:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 1/2] kasan/hw-tags: introduce kasan.write_only option To: Yeoreum Yun , glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.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 Cc: 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 References: <20250916222755.466009-1-yeoreum.yun@arm.com> <20250916222755.466009-2-yeoreum.yun@arm.com> Content-Language: en-US From: Andrey Ryabinin In-Reply-To: <20250916222755.466009-2-yeoreum.yun@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: zpg8k1ouzqbmphdbiogxtn58a7thdpec X-Rspamd-Queue-Id: 8086CC000B X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1758206859-832468 X-HE-Meta: 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 gxX0seJJ 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 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 9/17/25 12:27 AM, Yeoreum Yun wrote: > Since Armv8.9, FEATURE_MTE_STORE_ONLY feature is introduced to restrict > raise of tag check fault on store operation only. > Introduce 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. > > Signed-off-by: Yeoreum Yun > Reviewed-by: Catalin Marinas Reviewed-by: Andrey Ryabinin