From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 54C8BC8303F for ; Mon, 25 Aug 2025 20:26:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A1D908E006E; Mon, 25 Aug 2025 16:26:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9F4AA8E0038; Mon, 25 Aug 2025 16:26:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 90B238E006E; Mon, 25 Aug 2025 16:26:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 80E508E0038 for ; Mon, 25 Aug 2025 16:26:19 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 265C659652 for ; Mon, 25 Aug 2025 20:26:19 +0000 (UTC) X-FDA: 83816412078.22.EB79ABE Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) by imf06.hostedemail.com (Postfix) with ESMTP id 0A35018000A for ; Mon, 25 Aug 2025 20:26:16 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=NF6aItKy; spf=pass (imf06.hostedemail.com: domain of maciej.wieczor-retman@intel.com designates 192.198.163.11 as permitted sender) smtp.mailfrom=maciej.wieczor-retman@intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1756153577; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=HbFrm91SUbV4l5hJiwCmmvNUYm5bhZMJ5aJamdpeZ6g=; b=LIMqgWHbAZKAnp2rFvPnzAvTnzDN7ZJN6rTJk0xw5/gWRXgQnkwlj3piuZl9PlQ6GfiM2e C71F5a0rjxx96fJpAesKyOg3K1clkwGtruiYzc3PpR27o7+V2ApKzzKEo9jMXxqyjn+62+ pNQbDnTIAC7gn72wNhx16M1CF/bOJD0= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=NF6aItKy; spf=pass (imf06.hostedemail.com: domain of maciej.wieczor-retman@intel.com designates 192.198.163.11 as permitted sender) smtp.mailfrom=maciej.wieczor-retman@intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1756153577; a=rsa-sha256; cv=none; b=atOXO9xA9PrI80ukbQ97I3V08M39+Fjgsvynn8ms9grn41ubt2pjs6ZVt8Qi3qVSDGqJtD 8b6Kk825XTsJZ7xJ3wr9V0XV6c+s6j2YNavJdO5AcX14rmX/wtIaiLLJOM1X6xXdA6KWZX WOVyM9SdlDa6QpkJ+SlOOvw6NV9xo6E= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1756153577; x=1787689577; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9/RZLCMjXQxGvwHsrxYm6WSdmas+FAtxJYkFWNEbaFU=; b=NF6aItKybEokVAho7tSGxPKJdyTuTmqZczbR0D2RMa4/w7W5EpIPhS3e lrUkDbEQ/jzxPd6AOvghvvo3Tz618nZ3SI0sya6M/JLNymNR7kQCEZc6l zD6dMD0v6LWAIfJxCKt4pxEB0G2aQ61YTZQKX35RQ7rf0DR3loCPmCCJ9 y9s500b0rWefqe5DGNXs6BWgCqTBrKH8TMim9RDTDQgxbzwmGploxKPMg kAVxQ7kX9TBexD1lg5l8CZD3d7GZv9w/LgLFg/vuLvfWINCQij24PNOHa HtSfCLJn1AtOPDGMB/TTsrzk/GsE3XFTM+9QA9fIAaAfdVZ9xA+QXUXTr A==; X-CSE-ConnectionGUID: PAohe5LUT4urCgVr/M0NVw== X-CSE-MsgGUID: PMJjZtygTXyQ81MjnXQqAA== X-IronPort-AV: E=McAfee;i="6800,10657,11533"; a="68970325" X-IronPort-AV: E=Sophos;i="6.18,214,1751266800"; d="scan'208";a="68970325" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2025 13:26:15 -0700 X-CSE-ConnectionGUID: +L18yj8dSzOfEZlF7N6ftA== X-CSE-MsgGUID: jAlCsbyqSiWfjyrRW8QvcQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,214,1751266800"; d="scan'208";a="169779897" Received: from bergbenj-mobl1.ger.corp.intel.com (HELO wieczorr-mobl1.intel.com) ([10.245.245.6]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2025 13:25:53 -0700 From: Maciej Wieczor-Retman To: sohil.mehta@intel.com, baohua@kernel.org, david@redhat.com, kbingham@kernel.org, weixugc@google.com, Liam.Howlett@oracle.com, alexandre.chartre@oracle.com, kas@kernel.org, mark.rutland@arm.com, trintaeoitogc@gmail.com, axelrasmussen@google.com, yuanchu@google.com, joey.gouly@arm.com, samitolvanen@google.com, joel.granados@kernel.org, graf@amazon.com, vincenzo.frascino@arm.com, kees@kernel.org, ardb@kernel.org, thiago.bauermann@linaro.org, glider@google.com, thuth@redhat.com, kuan-ying.lee@canonical.com, pasha.tatashin@soleen.com, nick.desaulniers+lkml@gmail.com, vbabka@suse.cz, kaleshsingh@google.com, justinstitt@google.com, catalin.marinas@arm.com, alexander.shishkin@linux.intel.com, samuel.holland@sifive.com, dave.hansen@linux.intel.com, corbet@lwn.net, xin@zytor.com, dvyukov@google.com, tglx@linutronix.de, scott@os.amperecomputing.com, jason.andryuk@amd.com, morbo@google.com, nathan@kernel.org, lorenzo.stoakes@oracle.com, mingo@redhat.com, brgerst@gmail.com, kristina.martsenko@arm.com, bigeasy@linutronix.de, luto@kernel.org, jgross@suse.com, jpoimboe@kernel.org, urezki@gmail.com, mhocko@suse.com, ada.coupriediaz@arm.com, hpa@zytor.com, maciej.wieczor-retman@intel.com, leitao@debian.org, peterz@infradead.org, wangkefeng.wang@huawei.com, surenb@google.com, ziy@nvidia.com, smostafa@google.com, ryabinin.a.a@gmail.com, ubizjak@gmail.com, jbohac@suse.cz, broonie@kernel.org, akpm@linux-foundation.org, guoweikang.kernel@gmail.com, rppt@kernel.org, pcc@google.com, jan.kiszka@siemens.com, nicolas.schier@linux.dev, will@kernel.org, andreyknvl@gmail.com, jhubbard@nvidia.com, bp@alien8.de Cc: x86@kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, linux-kbuild@vger.kernel.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 02/19] kasan: sw_tags: Support tag widths less than 8 bits Date: Mon, 25 Aug 2025 22:24:27 +0200 Message-ID: <83955e7079c0fb9c11169d25adc6303f0c66c1ec.1756151769.git.maciej.wieczor-retman@intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: q7rt9w3k6t8dn9bsinr1mg4geumwn3d3 X-Rspam-User: X-Rspamd-Queue-Id: 0A35018000A X-Rspamd-Server: rspam01 X-HE-Tag: 1756153576-915047 X-HE-Meta: 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 8DEWImJb hXstrWxtOBv7TDYV0HfBQ0HirAAIT2VhBemjjJDAU5/5kGSdJ4o67Y3J5lRVT2qstZOFRs6YcYTcvVj0AUDUd45gzkJ0x+E6cFDpaw16AzufF87YJbSwDy9DweyhuHw6GkGh44Oz6t7L3spt0bVGujQUWI1g8Fp8xHbrZEe3dtI7mHP+PEoLCIiE+sNy7n44pVeIu1T6BlyaPfvQ97p4MkvzO5PFm8xZB6jHSOENoB0Xuxcvzg1KPeeN6xLdKI6HnKCtAPZT04cjERTUiW2OnnN399sGPNCWiD/xF4/JDsRhCguX1aY8EVSPxFErw1at2fqrLBBPGGMholgLOqsmSKeV3Eol0Ay+dmdeodGGGdIOxTmV/lZvT+0fi3SwYu2Zq1TEI0DylUdl+qi/QwXWWNxp7KMeusw9Qmqyu 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: From: Samuel Holland Allow architectures to override KASAN_TAG_KERNEL in asm/kasan.h. This is needed on RISC-V, which supports 57-bit virtual addresses and 7-bit pointer tags. For consistency, move the arm64 MTE definition of KASAN_TAG_MIN to asm/kasan.h, since it is also architecture-dependent; RISC-V's equivalent extension is expected to support 7-bit hardware memory tags. Reviewed-by: Andrey Konovalov Signed-off-by: Samuel Holland Signed-off-by: Maciej Wieczor-Retman --- arch/arm64/include/asm/kasan.h | 6 ++++-- arch/arm64/include/asm/uaccess.h | 1 + include/linux/kasan-tags.h | 13 ++++++++----- 3 files changed, 13 insertions(+), 7 deletions(-) diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h index e1b57c13f8a4..4ab419df8b93 100644 --- a/arch/arm64/include/asm/kasan.h +++ b/arch/arm64/include/asm/kasan.h @@ -6,8 +6,10 @@ #include #include -#include -#include + +#ifdef CONFIG_KASAN_HW_TAGS +#define KASAN_TAG_MIN 0xF0 /* minimum value for random tags */ +#endif #define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag) #define arch_kasan_reset_tag(addr) __tag_reset(addr) diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 5b91803201ef..f890dadc7b4e 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include diff --git a/include/linux/kasan-tags.h b/include/linux/kasan-tags.h index 4f85f562512c..e07c896f95d3 100644 --- a/include/linux/kasan-tags.h +++ b/include/linux/kasan-tags.h @@ -2,13 +2,16 @@ #ifndef _LINUX_KASAN_TAGS_H #define _LINUX_KASAN_TAGS_H +#include + +#ifndef KASAN_TAG_KERNEL #define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */ -#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */ -#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */ +#endif + +#define KASAN_TAG_INVALID (KASAN_TAG_KERNEL - 1) /* inaccessible memory tag */ +#define KASAN_TAG_MAX (KASAN_TAG_KERNEL - 2) /* maximum value for random tags */ -#ifdef CONFIG_KASAN_HW_TAGS -#define KASAN_TAG_MIN 0xF0 /* minimum value for random tags */ -#else +#ifndef KASAN_TAG_MIN #define KASAN_TAG_MIN 0x00 /* minimum value for random tags */ #endif -- 2.50.1