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04 Apr 2025 06:15:02 -0700 From: Maciej Wieczor-Retman To: hpa@zytor.com, hch@infradead.org, nick.desaulniers+lkml@gmail.com, kuan-ying.lee@canonical.com, masahiroy@kernel.org, samuel.holland@sifive.com, mingo@redhat.com, corbet@lwn.net, ryabinin.a.a@gmail.com, guoweikang.kernel@gmail.com, jpoimboe@kernel.org, ardb@kernel.org, vincenzo.frascino@arm.com, glider@google.com, kirill.shutemov@linux.intel.com, apopple@nvidia.com, samitolvanen@google.com, maciej.wieczor-retman@intel.com, kaleshsingh@google.com, jgross@suse.com, andreyknvl@gmail.com, scott@os.amperecomputing.com, tony.luck@intel.com, dvyukov@google.com, pasha.tatashin@soleen.com, ziy@nvidia.com, broonie@kernel.org, gatlin.newhouse@gmail.com, jackmanb@google.com, wangkefeng.wang@huawei.com, thiago.bauermann@linaro.org, tglx@linutronix.de, kees@kernel.org, akpm@linux-foundation.org, jason.andryuk@amd.com, snovitoll@gmail.com, xin@zytor.com, jan.kiszka@siemens.com, bp@alien8.de, rppt@kernel.org, peterz@infradead.org, pankaj.gupta@amd.com, thuth@redhat.com, andriy.shevchenko@linux.intel.com, joel.granados@kernel.org, kbingham@kernel.org, nicolas@fjasle.eu, mark.rutland@arm.com, surenb@google.com, catalin.marinas@arm.com, morbo@google.com, justinstitt@google.com, ubizjak@gmail.com, jhubbard@nvidia.com, urezki@gmail.com, dave.hansen@linux.intel.com, bhe@redhat.com, luto@kernel.org, baohua@kernel.org, nathan@kernel.org, will@kernel.org, brgerst@gmail.com Cc: llvm@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, x86@kernel.org Subject: [PATCH v3 02/14] kasan: sw_tags: Support tag widths less than 8 bits Date: Fri, 4 Apr 2025 15:14:06 +0200 Message-ID: <6db4abef7daff8cdb07ad1cfd4fdd30a4893d5c3.1743772053.git.maciej.wieczor-retman@intel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: C1DD680014 X-Stat-Signature: 5ntau6a5uexae679d9q1ojmap58gxi3n X-HE-Tag: 1743772528-571554 X-HE-Meta: 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 eNtfMaZR JsEtGLILEDxW6CBPn9NAtq+tQvdS1S+6coTGql4JXvNzC2d5qx8Xri9KdrAQCSkpVQjGVoCW6Ux7tjuYJodgyULuKF3jHwVEi8hp5gOBlzG1XZBIf2XDY2BLaZZgYL80zFl851Jmq92VKSPd2tRTtSGHhJTbutQnXAez/SkNcq8XDaQB/fQngsLL8GJoPMsce18TaACOVIsHvHmI6vCw7ct9lmujvSS8/BkK79Glr/FxGyhOd9++2i1qWhxr9y/P+56C2pVikO4SQcMLoKZtYBiip2CCy5gMwPSeGOV1loxeSfdZ3khhDPrk5To9vjnkTOLb8COngqL+G0Q5o1AIIY6qaE4hn2X9wkVExJA7oFV0i6T/80ymKPqWgmLCZVjBx5B90 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 x86 and RISC-V, which support different tag widths. For consistency, move the arm64 MTE definition of KASAN_TAG_MIN to asm/kasan.h, since it is also architecture-dependent. 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