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X-CSE-ConnectionGUID: r5GnRCdhSRGdJASau57RzQ== X-CSE-MsgGUID: 0/KoqY8oQbaFtRXueHTzAQ== X-IronPort-AV: E=McAfee;i="6800,10657,11520"; a="60903248" X-IronPort-AV: E=Sophos;i="6.17,284,1747724400"; d="scan'208";a="60903248" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2025 06:25:44 -0700 X-CSE-ConnectionGUID: G0cKUUX3QdeIuuUQDf731Q== X-CSE-MsgGUID: HyifQRzJTUaZ4oYqgT0L6w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,284,1747724400"; d="scan'208";a="165831317" Received: from vpanait-mobl.ger.corp.intel.com (HELO wieczorr-mobl1.intel.com) ([10.245.245.54]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2025 06:25:22 -0700 From: Maciej Wieczor-Retman To: nathan@kernel.org, arnd@arndb.de, broonie@kernel.org, Liam.Howlett@oracle.com, urezki@gmail.com, will@kernel.org, kaleshsingh@google.com, rppt@kernel.org, leitao@debian.org, coxu@redhat.com, surenb@google.com, akpm@linux-foundation.org, luto@kernel.org, jpoimboe@kernel.org, changyuanl@google.com, hpa@zytor.com, dvyukov@google.com, kas@kernel.org, corbet@lwn.net, vincenzo.frascino@arm.com, smostafa@google.com, nick.desaulniers+lkml@gmail.com, morbo@google.com, andreyknvl@gmail.com, alexander.shishkin@linux.intel.com, thiago.bauermann@linaro.org, catalin.marinas@arm.com, ryabinin.a.a@gmail.com, jan.kiszka@siemens.com, jbohac@suse.cz, dan.j.williams@intel.com, joel.granados@kernel.org, baohua@kernel.org, kevin.brodsky@arm.com, nicolas.schier@linux.dev, pcc@google.com, andriy.shevchenko@linux.intel.com, wei.liu@kernel.org, bp@alien8.de, ada.coupriediaz@arm.com, xin@zytor.com, pankaj.gupta@amd.com, vbabka@suse.cz, glider@google.com, jgross@suse.com, kees@kernel.org, jhubbard@nvidia.com, joey.gouly@arm.com, ardb@kernel.org, thuth@redhat.com, pasha.tatashin@soleen.com, kristina.martsenko@arm.com, bigeasy@linutronix.de, maciej.wieczor-retman@intel.com, lorenzo.stoakes@oracle.com, jason.andryuk@amd.com, david@redhat.com, graf@amazon.com, wangkefeng.wang@huawei.com, ziy@nvidia.com, mark.rutland@arm.com, dave.hansen@linux.intel.com, samuel.holland@sifive.com, kbingham@kernel.org, trintaeoitogc@gmail.com, scott@os.amperecomputing.com, justinstitt@google.com, kuan-ying.lee@canonical.com, maz@kernel.org, tglx@linutronix.de, samitolvanen@google.com, mhocko@suse.com, nunodasneves@linux.microsoft.com, brgerst@gmail.com, willy@infradead.org, ubizjak@gmail.com, peterz@infradead.org, mingo@redhat.com, sohil.mehta@intel.com Cc: linux-mm@kvack.org, linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, llvm@lists.linux.dev, kasan-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 02/18] kasan: sw_tags: Support tag widths less than 8 bits Date: Tue, 12 Aug 2025 15:23:38 +0200 Message-ID: <780347f3897ea97e90968de028c9dd02f466204e.1755004923.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: y7zigymyb6pbiy1bhmnq6i6dggi3cxa1 X-Rspam-User: X-Rspamd-Queue-Id: 56E93A000F X-Rspamd-Server: rspam05 X-HE-Tag: 1755005215-735870 X-HE-Meta: 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 h+Edc6Et +MKYaFY0Tqk7GkXnVUdomdN3szPw2F7qKj1suLdwZVQbW8OO9mG78C+gUJRGjIBxIkAFKasHA4djrbqYPV071BwSuTIGMOHBkqRCp+vw35BFK84/khMcGfIc586MbSd+pqIuya/VrOoQntLjkHLsKPwAS9EX6kylp0ky51n+FXjANzfZ7bwmtAH6KtK6EN+l4fC1JQIUHwkjTi64qNOfPvdDAa7rRoaNz/Xt4Ws6nUObbkV9iDT8i+maLmtNTjjtwQILtAlvJWpCzy6mJtQj2dW3Cvl6sfbLgmnv+T3ON/FTo+tVBawLw9/TIcs01U9qHPwpBLi6fGG2Dtn8+cVy4Lgrm6z2WVp6y3cGVue3JpDtkPQ731lCQWyfA8akmcz3MX9FL 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