From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A298C17E4; Mon, 11 Aug 2025 17:36:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754933797; cv=none; b=bw8+zSlDdqUINDQjzvgHa71VokTNagyr0hbd6m6z/K9EhOIR/o9RBSo8bNe3rctVVc121ojnW94R0k26iUCVlBz9O64zl4CenuD/ORGjgy027STPfIKlZ1tDI7jOSeL/KfagHWWqEk5Y2aTmNPzAepVXo8SfDP0+CHyxfOlSEqE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754933797; c=relaxed/simple; bh=5jpmH37c9rPdc4mQOiPE/KktdGLX/2Xf+8kKkVQ9Yvk=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=XqjgGJ1t8UdKQaA3CjKqrxfhHoXC9I7YMhUkO+1cyvJz9/k/vn+dsnqCV+kFEQoiClaKkGA7/m8tLHpNkeHSocHXB7kUFtC9zyQoiP56eBK+/6TVAM+9yQp7OWfDjdef0uYFEOCPjZYCjD+ams5xR6kM4axT0cIxE+BUGxAVYrc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 96350267F; Mon, 11 Aug 2025 10:36:26 -0700 (PDT) Received: from e129823.cambridge.arm.com (e129823.arm.com [10.1.197.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CDA733F63F; Mon, 11 Aug 2025 10:36:30 -0700 (PDT) From: Yeoreum Yun To: 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, 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, Yeoreum Yun Subject: [PATCH 0/2] introduce kasan stonly-mode in hw-tags Date: Mon, 11 Aug 2025 18:36:24 +0100 Message-Id: <20250811173626.1878783-1-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: workflows@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hardware tag based KASAN is implemented using the Memory Tagging Extension (MTE) feature. MTE is built on top of the ARMv8.0 virtual address tagging TBI (Top Byte Ignore) feature and allows software to access a 4-bit allocation tag for each 16-byte granule in the physical address space. A logical tag is derived from bits 59-56 of the virtual address used for the memory access. A CPU with MTE enabled will compare the logical tag against the allocation tag and potentially raise an tag check fault on mismatch, subject to system registers configuration. Since ARMv8.9, FEAT_MTE_STORE_ONLY can be used to restrict raise of tag check fault on store operation only. Using this feature (FEAT_MTE_STORE_ONLY), introduce KASAN store-only mode which restricts KASAN check store operation only. This mode omits KASAN check for fetch/load operation. Therefore, it might be used not only debugging purpose but also in normal environment. Yeoreum Yun (2): kasan/hw-tags: introduce store only mode kasan: apply store-only mode in kasan kunit testcases Documentation/dev-tools/kasan.rst | 3 + arch/arm64/include/asm/memory.h | 1 + arch/arm64/include/asm/mte-kasan.h | 6 + arch/arm64/kernel/cpufeature.c | 6 + arch/arm64/kernel/mte.c | 14 + include/linux/kasan.h | 2 + mm/kasan/hw_tags.c | 76 +++++- mm/kasan/kasan.h | 10 + mm/kasan/kasan_test_c.c | 423 +++++++++++++++++++++++------ 9 files changed, 457 insertions(+), 84 deletions(-) base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585 -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}